Marine power lithium battery device cooperative control system and control method thereof

Abstract

The invention discloses a cooperative control system for a marine power lithium battery device and a control method of the cooperative control system. The system is based on a general control, master control and slave control three-level control mode, considers the problem of collaborative control of a power system of the whole ship, solves the problem of collaborative control and management of a ship lithium battery pack through internal grading and external collaborative strategies, and ensures that a lithium battery device provides guarantee for safe operation of the ship; a modularized data acquisition unit is arranged, different sensing devices are matched with a processing circuit, the requirement for multi-type data or signal acquisition is met, and the system supports data processing of the battery state and SOC / SOH estimation of the battery state of charge of a battery pack; the real-time data information of the slave control battery is acquired and processed through a CAN (Controller Area Network); management and control of charging and discharging of the battery pack are achieved after processing is completed; two paths of total voltage detection of the battery end and the load end are adopted, voltage sampling is reliable, detection errors are small, and overvoltage and undervoltage protection is supported through threshold value comparison.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship power battery systems, and in particular relates to a coordinated control system for a ship power lithium battery device and a control method thereof. Background Art

[0002] Pure battery-powered ships and hybrid ships require large-capacity battery systems to power them, which poses new challenges to the operation control and management of large-capacity battery systems.

[0003] Patent CN108448180A discloses a ship battery management system, which consists of multiple parallel battery clusters, each battery cluster includes several battery packs connected in series, and each battery pack contains several battery cells that are first connected in series and then in parallel; the battery management adopts a three-level management mode of "general manager-cluster manager-package manager", and the battery management systems at each level communicate through the CAN bus. The advantage of this system is that it proposes a multi-level management method for ship batteries to address the problem that ship battery management is highly personalized and not suitable for general battery management systems. It can meet the management needs of different ship battery power systems by configuring parameters. However, the invention does not consider the coordination between the battery management system and the entire ship power system management, nor does it disclose how to monitor and estimate key parameters of the battery system, such as voltage, current, and battery state of charge SOC;

[0004] Patent CN205178578U discloses an electric ship power management system, in which the electric ship power supply includes multiple battery packs, each battery pack includes several batteries connected in series, each battery pack is connected to an information acquisition module, and the voltage detection module, current detection module, temperature detection module and output control module in each information acquisition module are connected to the battery management module, and the output end of the battery management module is connected to the host computer. The utility model regards the battery pack as a whole, and no longer measures the voltage, current, temperature and other data of each battery, but uniformly monitors the voltage, current, temperature and other data of the battery pack, thereby reducing costs and simplifying the structure, so that the method is suitable for ship power management, but does not consider the differences between single cells and the impact of the number of charge and discharge times, resulting in insufficient monitoring accuracy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a coordinated control system for marine power lithium battery devices which solves the problem of coordinated control and management of ship lithium battery groups through internal classification and external coordination strategies, and ensures that the lithium battery devices provide guarantee for the safe operation of the ship.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a coordinated control system for a marine power lithium battery device, including a lithium battery device, a control unit, an execution unit, a load end and a PMS power management system;

[0007] The lithium battery device provides battery power for the ship load and provides a monitoring data source for the control unit, including a combiner box, a domain control box, several high-voltage boxes and a lithium battery cluster. Each lithium battery cluster is equipped with multiple battery packs, each battery pack is equipped with 2-4 battery modules, and each lithium battery cluster is equipped with a corresponding high-voltage box;

[0008] The control unit includes a control module and a collection module. The collection module includes a detection circuit and several sensor components. The execution unit includes a lithium battery collaborative management module, a driving console panel and a domain control box panel. The load end provides the control unit with a load total pressure detection position. The control unit monitors the operation process of the lithium battery device and uses the monitoring results as the operation instructions of the execution unit to ensure the safe operation of the lithium battery device.

[0009] The PMS power management system has the ability to control the power and navigation status of the entire ship. As an external collaborative monitoring system for lithium battery devices, it realizes information interaction and collaborative decision-making with the control unit and collaborative management module through data communication to ensure the power supply safety of lithium battery devices and the navigation safety of ships.

[0010] It also includes an interactive device and a power supply unit. The interactive device is used to control information display and realize human-computer interaction. The power supply unit provides 24V working power supply and input protection for the control unit.

[0011] The control unit controls the safe operation of the lithium battery device through data and signal acquisition, processing and processing result analysis. Its data and signals come from the data signal source, which includes the combiner box assembly, domain control box assembly, high-voltage box assembly, battery module and charging seat. The data signal source is the data signal acquisition carrier of the acquisition module. The acquisition module acquires data and signals from the data signal source to provide system operation control data support for the control unit.

[0012] The data acquisition module includes acquisition component 1, acquisition component 2, acquisition component 3, and acquisition component 4, which respectively collect voltage, current, temperature, and input and output control DI / DO signals of the combiner box component, domain control box component, high-voltage box component, battery module, and charging station; the acquisition component includes a detection circuit and several sensor components;

[0013] The control module is set to a three-level control mode, including a general control component, a master control component and a slave control component; the lithium battery device is equipped with a general control component, each lithium battery cluster is equipped with a master control component, and each battery pack is equipped with a slave control component; the data acquisition and data processing of the control unit are automatically implemented through the program thread of the collaborative management module of the execution unit, which is divided into general control management, master control management, slave control management and database, which respectively implement and manage the general control component, master control component and slave control component. The database is used to store initial parameter data, collect and analyze data, and the control unit issues execution instructions for the data processing results to the driving console panel and domain control box panel for prompts and alarms, or operates the execution buttons on the driving console panel and domain control box panel to implement them.

[0014] As a preferred solution, the data collection is implemented periodically by the program threads of the general control management, the main control management, and the slave control management. The data is stored in the data cache area of ​​the respective controllers of the general control component, the main control component, and the slave control component. After secondary processing, it is stored in the database for call by the PMS power management system.

[0015] As a preferred solution, the sensing component uses an NTC sensor to collect temperature and a Hall sensor to collect current. The detection circuit includes a DI module for collecting input control signals arranged on the general control component, a signal processing circuit arranged on the main control component, and a voltage divider detection circuit arranged on the slave control component.

[0016] As a preferred solution, the main control component is used for detecting data, signals and data processing, including control input DI, output DO, ambient temperature and ambient over-temperature protection OTP temperature collection, high-voltage box A3 main circuit current collection, load end and battery end total pressure collection, battery end insulation detection;

[0017] The first acquisition component is a DI module, which is used to acquire abnormal operation of the relay / circuit breaker of the domain control box or thermal management signals. The second acquisition component is a combination of a Hall sensor and a detection circuit, which is used to detect the charging and discharging current of the main circuit of the high-voltage box. The third acquisition component uses a combination of the NTC sensor on the module and the voltage-dividing detection circuit of the slave control component for charging and discharging monomer temperature detection. The fourth acquisition component is an NTC sensor for acquiring the temperature of the charging station.

[0018] The slave control component is used for voltage and temperature acquisition of battery cells and voltage and temperature acquisition disconnection detection. The voltage and temperature channels store the acquired results in the data buffer area of ​​the controller waiting for secondary data processing, or realize data interaction between the slave control and the master control through CAN communication and RS485 communication;

[0019] Secondary processing includes data aggregation, single factor parameter extreme value calculation, average value calculation, battery state of charge SOC value estimation, and health state SOH value statistics. The collaborative management module calculates the recommended power value allowed by the power battery based on the battery state of charge SOC value, temperature, and voltage parameters, and provides it to the PMS power management system for power allocation, as follows:

[0020] First, for the voyage L to be performed, the battery charge state after the subsequent voyage must be greater than the safety value S Δ The formula is used to obtain the maximum battery capacity C that needs to be consumed within the subsequent flight time T. t :

[0021]

[0022] Where: SOC0 is the current battery state of charge, C t is the maximum battery capacity that needs to be consumed in the subsequent navigation time T, and C is the total battery capacity;

[0023] Then, the recommended sailing power limit value P is: P = C t ·U; (2)

[0024] Where U is the voltage of the power supply battery.

[0025] As a preferred solution, the main control component includes a temperature acquisition module, a total pressure acquisition module, an insulation monitoring module, a main control module, and a current acquisition module; the voltage, current data, and insulation signal are collected and processed by the main control component, and the processing results are uploaded to the main control component or sent to the execution unit for implementation;

[0026] As a preferred solution, the temperature acquisition module includes a temperature sensor and a temperature acquisition circuit, which are used for collecting ambient temperature and ambient over-temperature protection (OTP) temperature; the total voltage detection module includes a load-end total voltage detection circuit and a signal processing component 1, a battery-end total voltage detection circuit and a signal processing component 2; the insulation detection module includes a positive insulation monitoring circuit 1 and a signal processing component 3, a negative insulation monitoring circuit 4 and a signal processing component 4; the main control module includes a controller, a storage module, a DI / DO module, an encoding circuit, a timer, and a communication module; the current acquisition module includes a current sensor and a current detection circuit, which are used for real-time detection of circuit current, and the monitored current is used to estimate the battery state of charge SOC.

[0027] As a preferred solution, the DI / DO module is provided with a multi-channel DI detection circuit, which is connected to the controller through optical coupling isolation, and a multi-channel DO dry contact is set to realize the closing control of the high-voltage relay in the charging and discharging process. The DI detection circuit is used to detect the feedback signal after the DO output, and then judge whether the circuit operation logic is normal. At the same time, it also has the protection function of the detection system, including whether the manual switch MSD of the high-voltage box is pulled out or the emergency stop signal, the total positive and negative relay closure detection, and whether the fuse in the high-voltage box is blown, which is convenient for system protection processing; the input and output control includes power-on and power-off process control;

[0028] As a preferred solution, the storage module is used to save various alarm thresholds of the system configuration, the address of the controller, and also saves the battery state of charge SOC value and health state SOH value, the cumulative number of usage cycles, and has the function of saving key data during low-voltage power-off. The data generated during the system operation process is finally stored in the database to provide historical data analysis; the system alarm is divided into three levels of alarm settings according to the impact on the system operation. The first level is a warning alarm, the second level requires reducing the operating power, and the third level requires shutdown processing.

[0029] Another technical problem to be solved by the present invention is to provide a control method for the above-mentioned marine power lithium battery device coordinated control system.

[0030] In order to solve the above technical problems, the technical solution adopted by the present invention is: a control method for a coordinated control system of a marine power lithium battery device, comprising the following steps:

[0031] Step 1: System startup

[0032] The system is powered on and the driver initialization is performed, including all peripherals; each main control component simultaneously performs an insulation self-test and data initialization, including the initialization assignment of structure data and the assignment of default parameters;

[0033] Step 2: Task Scheduling

[0034] Create and start a periodically running automatic execution thread, and perform corresponding operations according to the set cycle. The automatic thread includes watchdog, analog quantity acquisition, information aggregation, battery state of charge SOC and health state SOH estimation;

[0035] Step 3: Insulation resistance self-test

[0036] Before the system task is executed, the master control component sends a command to the main control component to poll multiple battery clusters for detection and perform insulation resistance detection again to confirm that the battery terminal insulation is good; otherwise, the system automatically enters the alarm processing and executes step 6;

[0037] Step 4: The system runs automatically

[0038] The system automatically executes according to the task thread, including data collection, data analysis and processing, external command response, and alarm processing; when an external command is received, step five is executed; when a fault occurs during system operation, the sound and light alarm sounds an alarm, and step six is ​​executed; otherwise, this step is executed repeatedly;

[0039] The data acquisition operation specifically includes: the acquisition module executes the data acquisition thread, collects data from the data signal source and stores the data in the memory of the master control component, the main control component and the slave control component respectively;

[0040] Data processing and analysis operations specifically include:

[0041] Perform conventional calculations of the maximum, minimum, and average values ​​of temperature, voltage, and current data, and estimate the battery state of charge (SOC) and health state (SOH). Use a combination of ampere-hour integration and battery SOC-OCV curve to estimate the battery state of charge (SOC) to improve the estimation accuracy. This is used as a basis for determining whether the battery should be charged and discharged. When the battery state of charge (SOC) is less than 25%, charging is required. Estimate the health state (SOH) value based on the cumulative number of charging and discharging cycles, and compare it with the total number of battery cycles as a basis for determining whether the power battery needs to be replaced. If the health state (SOH) value is less than 80%, the battery needs to be replaced.

[0042] The data interaction operation specifically includes: according to their respective threads, the slave control component regularly uploads data to the master control component, the master control component regularly uploads data to the master control component, and the master control component regularly sends data to the PMS power management system;

[0043] Step 5: External command response

[0044] (1) Receive commands from the human-machine interface HMI or button control input, including start charging, start discharging, stop charging, stop discharging, and send them to the controller in a communication manner and respond to execution;

[0045] (2) The PMS power management system regularly monitors the battery charge status. When an abnormal situation (such as low battery) is encountered, the system will give a return suggestion based on navigation needs;

[0046] Step 6: Troubleshooting

[0047] The data collected by the master control component, main control component and slave control component are analyzed and compared with the three-level corresponding threshold values ​​stored in the storage module. If the corresponding set threshold range is met, the corresponding operation is performed: Level 1 alarm: sound and light alarm, warning; Level 2 alarm: sound and light alarm, reducing the operating power; Level 3 alarm: sound and light alarm, disconnecting the high-voltage relay, shutting down;

[0048] Step 7: Power off the system

[0049] System power-off judgment, if power-off, end system operation; otherwise, jump to step 3.

[0050] The beneficial effects of the present invention are:

[0051] (1) Based on the three-level control mode of general control, master control and slave control, this system considers the coordinated control of the whole ship power system and develops a coordinated control system for marine power lithium battery devices. Through the strategy of internal classification and external coordination, it solves the problem of coordinated control and management of ship lithium battery groups and ensures that lithium battery devices provide guarantee for the safe operation of ships.

[0052] (2) This system is equipped with a modular data acquisition unit, which meets the needs of multi-type data or signal acquisition through the cooperation of different sensor devices and processing circuits. The system supports data processing of battery status, supports estimation of battery state of charge SOC / health state SOH (charging state (battery state of charge SOC) and operating state (health state SOH)) of the battery pack; supports acquisition and processing of real-time data information of slave controlled batteries through CAN; after processing, it realizes management and control of battery pack charging and discharging;

[0053] (3) The battery end and the load end use two-way total voltage detection, which is reliable and has small detection error. Through threshold comparison, it supports overvoltage and undervoltage protection.

[0054] (4) This system uses secondary insulation resistance detection. The main control component performs a self-test once when the system is turned on, and monitors again before the battery starts to charge or discharge. The main control component sends instructions to the main control component to poll multiple battery clusters for detection, so as to avoid using the main control component alone to perform insulation detection at the same time at a certain time, resulting in abnormal insulation values; BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a composition diagram of the collaborative control system of the present invention;

[0056] Figure 2 It is a control logic diagram of the collaborative control system of the present invention;

[0057] Figure 3 The main control component composition and principle diagram of the present invention;

[0058] Figure 4 It is a flow chart of the working method of the collaborative control system of the present invention;

[0059] In the figure:

[0060] A-lithium battery device, B-control unit, C-execution unit, D-load end, E-power management system (PMS); A1-combiner box, A2-domain control box, A3-high voltage box, A4-lithium battery cluster; B1-control module, B2-acquisition module, B21-detection circuit, B22 sensor component; C1-cooperative management module, C2-driving console panel, C3-domain control box panel;

[0061] 1-data signal source, 11-combiner box assembly, 12-domain control box assembly, 13-high-voltage box assembly, 14-battery module, 15-charging seat; 21-acquisition component one, 22-acquisition component two, 23-acquisition component three, 24-acquisition component four; 31-general control component, 32-master control component, 33-slave control component; 41-general control management, 42-master control management, 43-slave control management, 44-database; 5-interactive equipment, 6-power supply unit;

[0062] 321-temperature acquisition module, 322-total pressure acquisition module, 323-insulation monitoring module, 324-main control module, 325-current acquisition module;

[0063] 3211-temperature sensor, 3212-temperature acquisition circuit, 3221-load end total voltage detection circuit, 3222-signal processing component 1, 3223-battery end total voltage detection circuit, 3224-signal processing component 2, 3231-positive insulation monitoring circuit 1, 3232-signal processing component 3, 3233-negative insulation monitoring circuit 4, 3234-signal processing component 4; 3241-controller, 3242-storage module, 3243-DI / DO module, 3244-encoding circuit, 3245-timer, 3246-communication module; 3251-current sensor, 3252-current detection circuit; DETAILED DESCRIPTION

[0064] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0065] like Figure 1-3 As shown, the coordinated control system of the marine power lithium battery device includes a lithium battery device A, a control unit B, an execution unit C, a load end D and a PMS power management system E;

[0066] The lithium battery device A provides battery power for the ship load and provides a monitoring data source for the control unit B, including a combiner box A1, a domain control box A2, multiple high-voltage boxes A3 and a lithium battery cluster A4. Each lithium battery cluster A4 is provided with multiple battery packs, each battery pack is configured with 2-4 battery modules, and each lithium battery cluster A4 is configured with a corresponding high-voltage box A3;

[0067] The control unit B includes a control module B1 and an acquisition module B2. The acquisition module B2 includes a detection circuit B21 and several sensor components B22, which are used to collect different types of data or signals. The execution unit C includes a lithium battery collaborative management module C1, a driving console panel C2, and a domain control box panel C3. The load end D is used to transmit the output power of the lithium battery device A to the load for use, and is provided with a common DC bus, a load drive module, and a load. The control unit B monitors the operation process of the lithium battery device A and uses the monitoring results as the operation instructions of the execution unit C to ensure the safe operation of the lithium battery device A.

[0068] The PMS power management system E has the ability to control the power and navigation status of the entire ship. As an external collaborative monitoring system for the lithium battery device A, it realizes information exchange and collaborative decision-making with the control unit B and the collaborative management module C1 through data communication. For example, it recommends power restrictions based on the battery charge state, or recommends return strategies in abnormal situations to ensure the power supply safety of the lithium battery device A and the navigation safety of the ship;

[0069] It also includes an interactive device 5 and a power supply unit 6. The interactive device 5 is used to control information display and realize human-computer interaction, including system parameter configuration, emergency shutdown, etc. The power supply unit 6 provides 24V working power supply and input protection for the control unit B;

[0070] like Figure 2 As shown, the control unit B realizes safe operation control of the lithium battery device A through data and signal acquisition, processing and processing result analysis. Its data and signals come from the data signal source 1. The data signal source 1 includes a combiner box component 11, a domain control box component 12, a high-voltage box component 13, a battery module 14 and a charging seat 15. The data signal source 1 is a data signal acquisition carrier of the acquisition module B2. The acquisition module B2 acquires data and signals from the data signal source 1 to provide system operation control data support for the control unit B.

[0071] The data acquisition module B2 includes an acquisition component 1 21, an acquisition component 22, an acquisition component 3 23, and an acquisition component 4 24, which respectively collect voltage, current, temperature, and input / output control DI / DO signals of the combiner box component 11, the domain control box component 12, the high-voltage box component 13, the battery module 14, and the charging seat 15;

[0072] The control module B1 is set to a three-level control mode, including a general control component 31, a main control component 32 and a slave control component 33; the lithium battery device A is equipped with a general control component 31, each lithium battery cluster A4 is equipped with a main control component 32, and each battery pack is equipped with a slave control component 33; the general control component 31 is arranged in the domain control box A2, including the controller PLC and its extended DI / DO module, CAN communication module, NTC sensor (PT100) temperature detection module; the data acquisition and data processing of the control unit B are automatically implemented through the program thread of the collaborative management module C1 of the execution unit C, which is divided into general control management 41, main control management 42, slave control management 43 and database 44, respectively implementing and operating the general control component 31, main control component 32 and slave control component 33, and the database 44 is used to store initial parameter data, collect and analyze data, and the control unit B issues execution instructions to the driving console panel C2 and the domain control box A2 panel C3 for prompts and alarms based on the data processing results, or operates the execution buttons on the driving console panel C2 and the domain control box A2 panel C3 to implement;

[0073] Data collection is periodically implemented by the program threads of the master control management 41, the main control management 42, and the slave control management 43. The data is stored in the data buffer area of ​​the respective controllers of the master control component 31, the main control component 32, and the slave control component 33. After secondary processing, it is stored in the database 44 for the PMS power management system E to call; the secondary processing includes data aggregation, single factor parameter extreme value calculation, average value calculation, battery state of charge SOC value estimation, health state SOH value statistics, and the collaborative management module C1 calculates the recommended power value allowed by the power battery according to the battery state of charge SOC value, temperature, and voltage parameters, and provides it to the PMS power management system E for power allocation, as follows:

[0074] First, calculate the battery capacity required for endurance

[0075] For the voyage (L) to be performed, the battery charge state after the subsequent voyage time T needs to be greater than the safety value S δ The formula is used to obtain the maximum battery capacity C that needs to be consumed within the subsequent flight time T. t :

[0076]

[0077] Where: SOC0 is the current battery state of charge, C t is the maximum battery capacity that needs to be consumed within the subsequent voyage time T, C is the total battery capacity, and the battery charge state after the subsequent voyage is completed must be greater than the safety value S δ , generally 25% is taken to ensure battery safety;

[0078] The battery capacity C required for the subsequent voyage tConverted into the corresponding total output power:

[0079] P r’ =U·C t (2)

[0080] Then, the recommended sailing power limit value P lim

[0081] The loads at the load end D include propulsion, daily use and other auxiliary equipment. The loads are divided into n independently controllable load units according to different uses, so that non-essential loads can be shut down according to the battery charge state, the total power output of the lithium battery device A can be controlled, and the recommended power limit can be effectively implemented, or in abnormal situations, the return strategy is recommended, as follows:

[0082] Define the working voltage of each independently controllable load unit as U i (V), current is I i (A), the mileage in time T (h) is L (Km);

[0083] Considering the variable speed characteristics of the ship (v i ), in order to improve the calculation accuracy, the differential idea is used to calculate the power consumed by each load unit and the total power within the range L / T. First, the power consumption calculation matrix of each load unit within a certain period of time is established:

[0084]

[0085] The above matrix represents the power consumed by the i-th load unit in the (j-1, j)th time; the row of the matrix corresponds to the i-th load unit. If the subsequent voyage T is divided into k time periods for calculation, the column of the above matrix corresponds to the power consumed in a certain time period;

[0086] Sum each row of the matrix to obtain the power consumed by the i-th load unit during the flight time T as P ij :

[0087]

[0088] According to model (2), the total power consumed by n load units during the voyage time T is calculated as P e :

[0089]

[0090] The working voltage of each load unit collected is U i (V) and the current is I i (A) The recommended sailing power limit value P based on models (2), (4) and (5) lim ;

[0091] If Pr≥Pe, take P lim =Pe;

[0092] If Pr≤Pe, turn off some non-essential loads in the load unit to satisfy: Pr≥Pe, to ensure that the battery charge state (current battery capacity) of the lithium battery system meets the requirements of different working conditions such as power limitation and abnormal return.

[0093] As shown in Table 1, the sensor component B22 uses an NTC sensor (negative temperature coefficient thermistor) to collect temperature and a Hall sensor to collect current. The detection circuit B21 includes a DI module for collecting input control signals arranged on the master control component 31, a signal processing circuit arranged on the master control component 32, and a voltage division detection circuit arranged on the slave control component 33;

[0094]

[0095]

[0096] Table 1

[0097] like Figure 3 As shown, the main control component 32 is used for detecting data, signals and data processing, including control input DI, output DO, ambient temperature and ambient over-temperature protection OTP temperature collection, high-voltage box A3 main circuit current collection, load end and battery end total pressure collection, battery end insulation detection;

[0098] The acquisition component 1 21 is a DI module, which is used for abnormal operation of the domain control box A2 relay / circuit breaker or thermal management signal acquisition. The acquisition component 2 22 is a combination of a Hall sensor and a detection circuit, which is used to detect the charging and discharging current of the main circuit of the high-voltage box; the acquisition component 3 23 uses the NTC sensor on the module and the voltage-dividing detection circuit combination of the slave control component 33 for charging and discharging monomer temperature detection. The acquisition component 4 24 is an NTC sensor, which is set in the charging seat and connected to the expansion module of the master control component 31, and is used to collect the charging seat temperature;

[0099] The slave control component 33 is used for battery cell voltage collection, temperature collection and voltage and temperature collection disconnection detection. The voltage and temperature channels save the collected results in the controller's data buffer area waiting for secondary data processing, or through CAN communication and / or RS485 communication, to achieve data interaction between the slave control and the master control.

[0100] As an implementation example, the main control component 32 includes a temperature acquisition module 321, a total pressure acquisition module 322, an insulation monitoring module 323, a main control module 324, and a current acquisition module 325; the voltage, current data and insulation signal are collected and processed by the main control component 32, and the processing results are uploaded to the main control component 31 or sent to the execution unit C for implementation;

[0101] The temperature acquisition module 321 includes a temperature sensor 3211 (NTC sensor) and a temperature acquisition circuit 3212 (voltage division detection circuit), which is used for ambient temperature and ambient over-temperature protection OTP temperature acquisition (external wiring harness of high-voltage box A3); the total pressure detection module 322 includes a load-end total pressure detection circuit 3221 and a signal processing component 1 3222, a battery-end total pressure detection circuit 3223 and a signal processing component 2 3224, and the insulation detection module 323 includes a positive insulation monitoring circuit 1 3231 and a signal processing component 3 3232, a negative insulation insulation monitoring circuit 4 3233 and a signal processing component 4 3234; the main control module 324 includes a controller 3241, storage module 3242, DI / DO module 3243, encoding circuit 3244, timer (real-time clock can also be used) 3245, communication module 3246; current acquisition module 325 includes current sensor 3251 (main circuit of high-voltage box A3) and current detection circuit 3252, which are used for real-time detection of circuit current, and the monitored current is used for estimation of battery state of charge SOC; main controller 3241 is powered by power supply unit 6, and main controller 3241 is provided with conversion power supply 3240 (output ±15V), which is used to power current sensor 3251, and current sensor outputs a small current signal to current detection circuit 3252 of main controller;

[0102] The insulation monitoring module 323 is used for battery terminal insulation detection. When the device is turned on, the main control component 32 performs a self-test. To ensure good insulation at the battery terminal, the main control component 32 performs another test before the battery starts charging or discharging. The main control component 31 sends a command to the main control component 32 to perform polling tests on multiple battery clusters to avoid using the main control component 32 alone to perform insulation tests at the same time at a certain time, which may lead to abnormal insulation values.

[0103] The DI / DO module 3243 is provided with a multi-channel DI (input) detection circuit, which is connected to the controller 3241 through optical coupling isolation, and a multi-channel DO (output) dry contact is set to realize the closing control of the high-voltage relay in the charging and discharging process. The DI detection circuit is used to detect the feedback signal after the DO output, and then judge whether the circuit operation logic is normal. At the same time, it also has the protection function of the detection system, including whether the manual switch (MSD) of the high-voltage box A3 is pulled out or the emergency stop signal, the total positive and negative relay closure detection, and whether the fuse in the high-voltage box is blown, so as to facilitate system protection processing; input and output control includes power-on and power-off process control;

[0104] The storage module 3242 is used to save various alarm thresholds configured by the system, the address of the controller, and also saves the battery state of charge SOC value and health state SOH value, the cumulative number of cycles, and has the function of saving key data during low voltage power failure. The data generated during the system operation process is finally stored in the database 44 to provide historical data analysis. The system alarm is divided into three levels of alarm settings according to the impact on the system operation. The first level is a warning alarm, the second level requires reducing the operating power, and the third level is the most serious and requires shutdown processing;

[0105] like Figure 4 As shown, the control method of the marine power lithium battery device cooperative control system includes the following steps:

[0106] Step 1: System startup

[0107] The system is powered on and driver initialization is performed, including all peripherals; each main control component 32 simultaneously performs an insulation self-test and data initialization, including initialization assignment of structure data and assignment of default parameters;

[0108] Step 2: Task Scheduling

[0109] Create and start a periodically running automatic execution thread, and perform corresponding operations according to the set cycle. The automatic thread includes watchdog, analog quantity acquisition, information aggregation, battery state of charge SOC and health state SOH estimation;

[0110] Step 3: Insulation resistance self-test

[0111] Before the system task is executed, the master control component 31 sends a command to the main control component 32 to poll multiple battery clusters and perform insulation resistance detection again to confirm that the insulation of the battery end is good; otherwise, the system automatically enters the alarm processing and executes step six;

[0112] Step 4: The system runs automatically

[0113] The system automatically executes according to the task thread, including data collection, data analysis and processing, external command response, and alarm processing; when an external command is received, step five is executed; when a fault occurs during system operation, the sound and light alarm sounds an alarm, and step six is ​​executed; otherwise, this step is executed repeatedly;

[0114] The data acquisition operation specifically includes: the acquisition module B2 executes the data acquisition thread, collects data from the data signal source 1 and stores the data in the memory of the master control component 31, the master control component 32, and the slave control component 33 respectively;

[0115] Data processing and analysis operations specifically include:

[0116] Perform conventional calculations of the maximum, minimum, and average values ​​of temperature, voltage, and current data, and estimate the battery state of charge (SOC) and health state (SOH). Use a combination of ampere-hour integration and battery SOC-OCV curve to estimate the battery state of charge (SOC) to improve the estimation accuracy. This is used as a basis for determining whether the battery should be charged and discharged. When the battery state of charge (SOC) is less than 25%, charging is required. Estimate the health state (SOH) value based on the cumulative number of charging and discharging cycles, and compare it with the total number of battery cycles as a basis for determining whether the power battery needs to be replaced. If the health state (SOH) value is less than 80%, the battery needs to be replaced.

[0117] The data interaction operation specifically includes: according to the respective threads, the slave control component 33 regularly uploads data to the master control component 32, the master control component 32 regularly uploads data to the master control component 31, and the master control component 31 regularly sends data to the PMS power management system E;

[0118] Step 5: External command response

[0119] (1) Receive commands from the human-machine interface HMI or button control input, including start charging, start discharging, stop charging, stop discharging, and send them to the controller in a communication manner and respond to execution;

[0120] (2) The PMS power management system E regularly monitors the battery charge status. When encountering an abnormal situation (such as low battery), the system will give a return suggestion based on navigation needs;

[0121] Step 6: Troubleshooting

[0122] The data analysis structure collected by the general control component, the main control component and the slave control component is compared with the three-level corresponding threshold division stored in the storage module 3242, and the corresponding operation is performed if the corresponding threshold range is met;

[0123] (1) Level 1 alarm: sound and light alarm, warning;

[0124] (2) Secondary alarm: sound and light alarm, reducing operating power;

[0125] (3) Three-level alarm: sound and light alarm, disconnection of high-voltage relay, and shutdown;

[0126] Step 7: Power off the system

[0127] System power-off judgment, if power-off, end system operation; otherwise, jump to step 3.

[0128] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A coordinated control system for a marine power lithium battery device, comprising a lithium battery device, a control unit, an execution unit, a load end and a PMS power management system; The lithium battery device provides battery power for the ship load and provides a monitoring data source for the control unit, including a combiner box, a domain control box, several high-voltage boxes and a lithium battery cluster. Each lithium battery cluster is equipped with multiple battery packs, each battery pack is equipped with 2-4 battery modules, and each lithium battery cluster is equipped with a corresponding high-voltage box; Features: The control unit includes a control module and a collection module, wherein the collection module includes a detection circuit and several sensor components; the execution unit includes a lithium battery collaborative management module, a driving console panel and a domain control box panel; the load end provides a load total pressure detection position for the control unit; the control unit monitors the operation process of the lithium battery device and uses the monitoring results as the operation instructions of the execution unit to ensure the safe operation of the lithium battery device; The PMS power management system has the ability to control the power and navigation status of the entire ship. As an external collaborative monitoring system for the lithium battery device, it realizes information interaction and collaborative decision-making with the control unit and the collaborative management module through data communication to ensure the power supply safety of the lithium battery device and the navigation safety of the ship; It also includes an interactive device and a power supply unit. The interactive device is used to control information display and realize human-computer interaction. The power supply unit provides 24V working power supply and input protection for the control unit. The control unit performs safe operation control of the lithium battery device through data and signal acquisition, processing and processing result analysis. The data and signals are derived from the data signal source, which includes the combiner box assembly, the domain control box assembly, the high-voltage box assembly, the battery module and the charging seat. The data signal source is the data signal acquisition carrier of the acquisition module. The data and signal acquisition of the data signal source is performed through the acquisition module to provide system operation control data support for the control unit. The data acquisition module includes acquisition component 1, acquisition component 2, acquisition component 3, and acquisition component 4, which respectively collect voltage, current, temperature, and input and output control DI / DO signals of the combiner box component, domain control box component, high-voltage box component, battery module, and charging station; the acquisition component includes a detection circuit and several sensor components; The control module is set to a three-level control mode, including a general control component, a master control component and a slave control component; the lithium battery device is equipped with a general control component, each lithium battery cluster is equipped with a master control component, and each battery pack is equipped with a slave control component; the data acquisition and data processing of the control unit are automatically implemented through the program thread of the collaborative management module of the execution unit, which is divided into general control management, master control management, slave control management and database, which respectively implement and manage the general control component, master control component and slave control component. The database is used to store initial parameter data, collect and analyze data, and the control unit issues execution instructions for the data processing results to the driving console panel and domain control box panel for prompts and alarms, or operates the execution buttons on the driving console panel and domain control box panel to implement them.

2. A marine power lithium battery device cooperative control system as claimed in claim 1, characterized in that: The data collection is periodically implemented by the program threads of the general control management, the main control management, and the slave control management. The data is stored in the data cache area of ​​the controllers of the general control component, the main control component, and the slave control component. After secondary processing, it is stored in the database for the PMS power management system to call.

3. A marine power lithium battery device cooperative control system as claimed in claim 1, characterized in that: The sensing component uses an NTC sensor to collect temperature and a Hall sensor to collect current. The detection circuit includes a DI module for collecting input control signals arranged on the master control component, a signal processing circuit arranged on the master control component, and a voltage division detection circuit arranged on the slave control component.

4. A marine power lithium battery device cooperative control system as claimed in claim 2, characterized in that: The main control component is used for detecting data, signals and data processing, including control input DI, output DO, ambient temperature and ambient over-temperature protection OTP temperature collection, high-voltage box A3 main circuit current collection, load end and battery end total voltage collection, battery end insulation detection; The first acquisition component is a DI module, which is used to acquire abnormal operation of the relay / circuit breaker of the domain control box or thermal management signals. The second acquisition component is a combination of a Hall sensor and a detection circuit, which is used to detect the charging and discharging current of the main circuit of the high-voltage box. The third acquisition component uses a combination of the NTC sensor on the module and the voltage-dividing detection circuit of the slave control component for charging and discharging monomer temperature detection. The fourth acquisition component is an NTC sensor for acquiring the temperature of the charging station. The slave control component is used for voltage and temperature acquisition of battery cells and voltage and temperature acquisition disconnection detection. The voltage and temperature channels store the acquired results in the data buffer area of ​​the controller waiting for secondary data processing, or realize data interaction between the slave control and the master control through CAN communication and RS485 communication; Secondary processing includes data aggregation, single factor parameter extreme value calculation, average value calculation, battery state of charge SOC value estimation, and health state SOH value statistics. The collaborative management module calculates the recommended power value allowed by the power battery based on the battery state of charge SOC value, temperature, and voltage parameters, and provides it to the PMS power management system for power allocation, as follows: First, for the voyage L to be performed, the battery charge state after the subsequent voyage must be greater than the safety value S Δ The formula is used to obtain the maximum battery capacity C that needs to be consumed within the subsequent flight time T. t : Battery state of charge Where: SOC0 is the current battery state of charge, C t is the maximum battery capacity that needs to be consumed in the subsequent navigation time T, and C is the total battery capacity; Then, the recommended sailing power limit value P is: P = C t ·U; (2) Where U is the voltage of the power supply battery.

5. A marine power lithium battery device cooperative control system as claimed in claim 2, characterized in that: The main control component includes a temperature acquisition module, a total pressure acquisition module, an insulation monitoring module, a main control module, and a current acquisition module; after the voltage, current data and insulation signal are collected and processed by the main control component, the processing results are uploaded to the main control component or sent to the execution unit for implementation.

6. A marine power lithium battery device cooperative control system as claimed in claim 5, characterized in that: The temperature acquisition module includes a temperature sensor and a temperature acquisition circuit for collecting ambient temperature and ambient over-temperature protection OTP temperature; the total pressure detection module includes a load-end total pressure detection circuit and a signal processing component 1, a battery-end total pressure detection circuit and a signal processing component 2, and the insulation detection module includes a positive insulation monitoring circuit 1 and a signal processing component 3, a negative insulation insulation monitoring circuit 4 and a signal processing component 4; the main control module includes a controller, a storage module, a DI / DO module, an encoding circuit, a timer, and a communication module; The current acquisition module includes a current sensor and a current detection circuit, which are used for real-time detection of circuit current. The monitored current is used to estimate the battery state of charge (SOC).

7. A marine power lithium battery device cooperative control system as claimed in claim 6, characterized in that: The DI / DO module is provided with a multi-channel DI detection circuit, which is connected to the controller through optical coupling isolation, and a multi-channel DO dry contact is set to realize the closing control of the high-voltage relay in sequence during the charging and discharging process. The DI detection circuit is used to detect the feedback signal after the DO output, and then judge whether the circuit operation logic is normal. At the same time, it also has the protection function of the detection system, including whether the manual switch MSD of the high-voltage box is pulled out or the emergency stop signal, the total positive and negative relay closure detection, and whether the fuse in the high-voltage box is blown, which is convenient for system protection processing; the input and output control includes power-on and power-off process control.

8. A coordinated control system for a marine power lithium battery device as claimed in claim 7, characterized in that: The storage module is used to save various alarm thresholds of the system configuration, the address of the controller, and also saves the battery state of charge SOC value and health state SOH value, the cumulative number of usage cycles, and has the function of saving key data in the event of low-voltage power failure. The data generated during the system operation process is finally stored in the database to provide historical data analysis; the system alarm is divided into three levels of alarm settings according to the impact on the system operation, the first level is a warning alarm, the second level requires reducing the operating power, and the third level requires shutdown processing.

9. A control method for a coordinated control system of a marine power lithium battery device according to any one of claims 1 to 8, comprising the following steps: Step 1: System startup The system is powered on and the driver initialization is performed, including all peripherals; each main control component simultaneously performs an insulation self-test and data initialization, including the initialization assignment of structure data and the assignment of default parameters; Step 2: Task Scheduling Create and start a periodically running automatic execution thread, and perform corresponding operations according to the set cycle. The automatic thread includes watchdog, analog quantity acquisition, information aggregation, battery state of charge SOC and health state SOH estimation; Step 3: Insulation resistance self-test Before the system task is executed, the master control component sends a command to the main control component to poll multiple battery clusters for detection and perform insulation resistance detection again to confirm that the battery terminal insulation is good; otherwise, the system automatically enters the alarm processing and executes step 6; Step 4: The system automatically runs The system automatically executes according to the task thread, including data collection, data analysis and processing, external command response, and alarm processing; when an external command is received, step five is executed; when a fault occurs during system operation, the sound and light alarm sounds an alarm, and step six is ​​executed; Otherwise, repeat this step; The data acquisition operation specifically includes: the acquisition module executes the data acquisition thread, collects data from the data signal source and stores the data in the memory of the master control component, the main control component and the slave control component respectively; Data processing and analysis operations specifically include: Perform conventional calculations of the maximum, minimum, and average values ​​of temperature, voltage, and current data, and estimate the battery state of charge (SOC) and health state (SOH). Use a combination of ampere-hour integration and battery SOC-OCV curve to estimate the battery state of charge (SOC) to improve the estimation accuracy. This is used as a basis for determining whether the battery should be charged and discharged. When the battery state of charge (SOC) is less than 25%, charging is required. Estimate the health state (SOH) value based on the cumulative number of charging and discharging cycles, and compare it with the total number of battery cycles as a basis for determining whether the power battery needs to be replaced. If the health state (SOH) value is less than 80%, the battery needs to be replaced. The data interaction operation specifically includes: according to their respective threads, the slave control component regularly uploads data to the master control component, the master control component regularly uploads data to the master control component, and the master control component regularly sends data to the PMS power management system; Step 5: External command response (1) Receive commands from the human-machine interface HMI or button control input, including start charging, start discharging, stop charging, stop discharging, and send them to the controller in a communication manner and respond to execution; (2) The PMS power management system regularly monitors the battery charge status. When an abnormal situation occurs, the system gives a return suggestion based on navigation needs; Step 6: Troubleshooting The data analysis structure collected by the general control component, the main control component and the slave control component is compared with the three-level corresponding threshold division stored in the storage module. If the corresponding set threshold range is met, the corresponding operation is performed: Level 1 alarm: sound and light alarm, warning; Second level alarm: sound and light alarm, reduce the operating power; third level alarm: sound and light alarm, disconnect the high voltage relay, and shut down; Step 7: Power off the system System power-off judgment, if power-off, end system operation; otherwise, jump to step 3.

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