Electric propulsion ship power system

Abstract

The present invention relates to a power system for an electric propulsion vessel capable of implementing operational stabilization between the battery and the components constituting collision avoidance of the electric propulsion vessel and controlling the power of the electric propulsion vessel. The power system for an electric propulsion vessel comprises: a battery unit comprising a plurality of battery modules electrically connected in parallel, each composed of a plurality of battery cells and individual BMSs of the battery cells, and a battery pack composed of an integrated BMS of the battery modules; a power conversion unit that receives power stored in the battery unit, converts it into DC power, and outputs it; a composite sensor unit that senses the surrounding environment of the electric propulsion vessel based on the power received from the power conversion unit; and an integrated control unit that is electrically connected to the battery unit, the power conversion unit, and the composite sensor unit and controls operation.

Description

Technology Field

[0001] The present invention relates to a power system for an electric propulsion vessel, and more specifically, to a power system for an electric propulsion vessel capable of implementing operational stabilization between the battery of the electric propulsion vessel and a component constituting collision avoidance, and controlling the power of the electric propulsion vessel. Background Technology

[0003] Generally, while future technologies in the shipbuilding sector, such as eco-friendly smart ships, are emerging and being developed to respond to global environmental regulations, the required technologies are being implemented mainly for large vessels, and there is a lack of technologies that are actually integrated and applied to vessels under 5 tons, which account for the largest share.

[0004] Meanwhile, maritime accidents caused by collisions are increasing every year, and fishing vessels account for the largest share, making it necessary to ensure the safety of fishing vessels under 5 tons and implement pure electric eco-friendly ship technology.

[0005] However, due to a lack of research on actual vessel application, conventional development cases face limitations in implementing the technology required for small vessels. Furthermore, electric propulsion systems and battery systems are sometimes applied as outboard motor types, occupying workspace and hindering fishing activities, and requiring the removal of outboard fishing gear storage warehouses.

[0006] Furthermore, high heat is generated during the charging and discharging of the battery supplying power to the electric propulsion system, accelerating battery degradation and rapidly reducing its lifespan. Additionally, high heat is conducted to peripheral equipment installed around the battery, causing thermal damage and potentially leading to malfunctions in the overall electric propulsion system.

[0007] Accordingly, there is a need for a technology that effectively dissipates the high heat of the battery cells and battery packs to cover for errors or malfunctions in any single sensor, thereby achieving thermal stability and operational stabilization of the battery module, and preventing thermal damage by minimizing the conduction of high heat to peripheral devices of the battery system. Prior art literature

[0009] Republic of Korea Published Patent Application No. 10-2019-0091882 The problem to be solved

[0010] The present invention has been devised to solve the aforementioned problems, and the objective of the present invention is to provide a power system for an electric propulsion vessel capable of controlling the power of the electric propulsion vessel and achieving operational stabilization between the battery of the electric propulsion vessel and the components constituting collision avoidance.

[0012] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0014] To achieve the above objective, the present invention is characterized by comprising, in a power system for an electric propulsion vessel, a battery unit comprising a plurality of battery modules electrically connected in parallel, each module comprising a plurality of battery cells and individual BMSs of the battery cells, and a battery pack comprising an integrated BMS of the battery modules; a power conversion unit that receives power stored in the battery unit, converts it into direct current power, and outputs it; a composite sensor unit that senses the surrounding environment of the electric propulsion vessel based on the power received from the power conversion unit; and an integrated control unit that is electrically connected to the battery unit, the power conversion unit, and the composite sensor unit, and controls the operation.

[0015] In addition, the composite sensor unit is characterized by including a rotary lidar that scans the surrounding environment of the electric propulsion vessel and a gyrocompass that detects the heading angle and rotation rate of the electric propulsion vessel.

[0016] In addition, the composite sensor unit is characterized by being composed of an AIS that transmits the name, specifications, and speed of the electric propulsion vessel, and a radar that detects maritime targets, measures the relative speed of maritime targets, and measures the wave height of the sea surface, thereby preventing collision with maritime targets.

[0017] In addition, the integrated control unit is characterized by analyzing sensing information from the composite sensor unit and marine environment information through hull attitude control and speed control algorithms according to an autopilot operation mode that follows waypoints of a preset route, and controlling to avoid collisions with marine targets while following the waypoints.

[0018] In addition, the battery cell is characterized as being a lithium-ion battery. Effects of the invention

[0020] The present invention effectively dissipates high heat from individual battery cells and battery packs, achieves thermal stability and operational stabilization of the battery module even in the event of sensor errors or malfunctions, and provides the effect of avoiding collisions by sensing the surrounding environment of a ship.

[0021] In addition, by analyzing sensor data and marine environmental information to control the electric propulsion system, it enables collision avoidance during autonomous operation. Furthermore, the battery system and power conversion system are integrated and positioned in the onboard engine room adjacent to the onboard shaft-type electric propulsion system, thereby utilizing the deck space to avoid interfering with activities such as fishing on the deck, and providing the effect of preventing corrosion and damage to the battery system and power conversion system caused by exposure to the outside. Brief explanation of the drawing

[0023] FIG. 1 is a schematic diagram showing the power system of an electric propulsion ship according to a preferred embodiment of the present invention. Figure 2 is an implementation diagram showing Figure 1. Specific details for implementing the invention

[0024] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0025] Specific details for implementing the present invention will be described in detail with reference to the drawings attached below. Regardless of the drawings, identical reference numerals refer to identical components, and "and / or" includes each of the mentioned items and all combinations of one or more.

[0026] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

[0027] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components in addition to the components mentioned.

[0028] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0031] FIG. 1 is a configuration diagram showing a power system of an electric propulsion ship according to a preferred embodiment of the present invention, and FIG. 2 is an implementation diagram showing FIG. 1.

[0032] As illustrated in FIGS. 1 and 2, the power system of the electric propulsion vessel of the present invention comprises a battery unit (100), a power conversion unit (200), a composite sensor unit (300), and an integrated control unit (400).

[0033] First, the battery unit (100) is designed to be 30 kWh class and is configured to supply power to the electric propulsion system of an electric propulsion vessel, for example, and is composed of a plurality of battery cells (110) which are vertically stacked lithium-ion batteries, individual BMS (120) of the battery cells (110), a plurality of battery modules (130) which are electrically connected in parallel, a battery pack (150) composed of an integrated BMS (140) of the battery modules (130), and an outer case (160) that covers the battery pack (150).

[0034] Here, the individual BMS (Battery Management System) (120) identifies the waterproof status inside the battery pack (150) through a water immersion sensor, monitors the power supply in real time, maintains the voltage level between each battery cell (110) evenly, and performs functions such as preventing overcharging and over-discharging, measuring the remaining battery capacity, measuring the current consumption, and preventing short circuits.

[0035] Additionally, the battery module (130) can be configured to be replaced in a module-by-module manner in the battery pack (150) to facilitate maintenance, and can be packaged in the battery pack (150) with an interlayer insertion structure of a heat dissipation layer filled with a heat dissipating filler and equipped with a cooling plate to prevent overheating, and can also form an electromagnetic interference shielding structure between electrically parallel-connected battery modules (130).

[0036] Additionally, although not shown, a cushioning pad may be interposed between the battery cells (110) and stacked to absorb vibrations caused by collisions, waves, etc. during navigation, and an aluminum cover with a membrane structure may be attached to both sides of the battery cells (110) to minimize deformation caused by temperature changes and to strengthen strength and sealing properties, thereby ensuring the structural stability of the battery cells (110).

[0037] And the integrated BMS (140) can measure the voltage, current, and temperature of all battery cells (110), transmit and receive data through serial communication and CAN (Controller Area Network) communication between individual BMSs (120), measure the remaining capacity and aging degree of the battery cells (110), equalize the cell voltage, and diagnose the battery cells (110).

[0038] Next, the power conversion unit (200) can receive power stored in the battery unit (100), convert it into direct current power, and output it.

[0039] At this time, the power conversion unit (200) converts the output of the commercial power stored in the battery unit into DC power and supplies it to the composite sensor unit (300) and the integrated control unit (400).

[0040] Next, the composite sensor unit (300) is configured to sense the surrounding environment of the electric propulsion vessel based on the power supplied from the power change unit (200).

[0041] Here, the composite sensor unit (300) is composed of a communication module (310) that communicates using VHF in a radio frequency range of 30 MHz to 300 MHz, a Differential GPS (DGPS) (320), a 360° rotating LiDAR (Light Detection And Ranging) (330) equipped with a 2-axis stabilizer that transmits and receives laser pulses to scan the surrounding environment during navigation and detect three-dimensional maritime targets, a gyrocompass (340) that detects the attitude, heading angle, and radius of turning of the hull, an Auto Identification System (AIS) (350) that transmits the ship's name, specifications, and speed, and a radar (360) that detects maritime targets, measures the relative speed of maritime targets, and measures the wave height of the sea surface, thereby sensing to prevent collision with maritime targets.

[0042] And the integrated control unit (400) is electrically connected to the battery unit (100), power conversion unit (200) and composite sensor unit (300) and controls the operation.

[0043] Here, the integrated control unit (400) can control the ship to avoid collision with a sea object while following the waypoint by analyzing the sensing information from the composite sensor unit and the marine environment information through the ship attitude control and speed control algorithms according to the autopilot operation mode that follows the waypoint of the preset route.

[0044] At this time, the integrated control unit (400), in accordance with the autopilot operation mode that sequentially follows waypoints of a preset route based on the sensing information transmitted from the composite sensor unit (300), analyzes the sensing information from the composite sensor unit (300) and marine environment information through a hull attitude control and speed control algorithm, and performs emergency braking and reverse thrust of the vessel to avoid collision with other vessels, marine objects such as buoys, and other marine objects approaching within a certain distance while following the waypoints.

[0045] Through this, the integrated control unit (400) can calculate the distance and approach speed to other vessels and sea buoys, and control the heading angle and speed at the current position to make the vessel brake suddenly so that other vessels pass outside the safety distance, or change the heading angle and speed to bypass the sea buoys.

[0046] Accordingly, the operation of the electric propulsion vessel is controlled by analyzing the sensing information of the composite sensor unit (300) and marine environment information through the integrated control unit (400) to enable autonomous operation and avoid collisions, and the battery unit (100) and the power conversion unit (200) are integrated and placed in the onboard engine room adjacent to the onboard shaft-type electric propulsion system so as to utilize the deck so as not to interfere with activities such as fishing on the deck, and to prevent corrosion and damage to the battery system and power conversion system due to exposure outside the vessel.

[0048] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0050] 100 : Battery section 110 : Battery cell 120 : Individual BMS 130 : Battery module 140 : Integrated BMS 150 : Battery pack 160 : External case 200 : Power converter 300 : Complex sensor unit 310 : Communication module 320 : GPS 330: Rotating LiDAR 340 : Gyrocompass 350 : AIS 360 : Radar360 400: Integrated sensor unit

Claims

Claim 1 A power system for an electric propulsion vessel comprises: a battery unit comprising a plurality of battery modules, each composed of a plurality of battery cells and individual BMSs of the battery cells and electrically connected in parallel, and a battery pack composed of an integrated BMS of the battery modules; a power conversion unit that receives power stored in the battery unit, converts it into direct current power, and outputs it; and a composite sensor unit that senses the surrounding environment of the electric propulsion vessel based on the power received from the power conversion unit. The power system of an electric propulsion vessel comprises: an integrated control unit electrically connected to the battery unit, power conversion unit, and composite sensor unit and controlling operation; wherein the composite sensor unit is composed of an AIS that transmits the name, specifications, and speed of the electric propulsion vessel, and a radar that detects sea targets, measures the relative speed of sea targets, and measures the wave height of the sea surface; and wherein the integrated control unit analyzes sensing information from the composite sensor unit and sea environment information through hull attitude control and speed control algorithms according to an autopilot operation mode that follows waypoints of a preset route, and controls the vessel to avoid collision with sea targets while following the waypoints. Claim 2 The power system of an electric propulsion vessel according to claim 1, wherein the composite sensor unit comprises a rotary lidar that scans the surrounding environment of the electric propulsion vessel and a gyrocompass that detects the heading angle and rotation rate of the electric propulsion vessel. Claim 3 delete Claim 4 delete Claim 5 A power system for an electric propulsion vessel according to claim 1, characterized in that the battery cell is a lithium-ion battery.

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