CN106972576A - Lithium battery energy storage battery system - Google Patents
Lithium battery energy storage battery system Download PDFInfo
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- CN106972576A CN106972576A CN201710277603.XA CN201710277603A CN106972576A CN 106972576 A CN106972576 A CN 106972576A CN 201710277603 A CN201710277603 A CN 201710277603A CN 106972576 A CN106972576 A CN 106972576A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明公开了一种锂电池储能系统，包括电池管理单元、锂电池储能模块单元、电源单元以及电气控制单元；所述锂电池储能模块单元用于向所述电源单元供电，所述电源单元用于为所述电池管理单元和所述电气控制单元供电；所述电池管理单元用于对所述锂电池储能模块单元进行监测，并根据监测数据控制所述电气控制单元，通过所述电气控制单元对所述锂电池储能模块单元进行自保护及自恢复。本发明能够对锂电池储能模块单元进行监测，并根据不同的监测数据来对锂电池储能模块单元进行自保护和自恢复，从而使得本发明的锂电池储能系统具有自保护和自恢复的功能，并且本发明的锂电池储能系统并不复杂，内部控制简单方便，成本也很低，非常便于规模化应用。
The invention discloses a lithium battery energy storage system, comprising a battery management unit, a lithium battery energy storage module unit, a power supply unit and an electrical control unit; the lithium battery energy storage module unit is used to supply power to the power supply unit, the The power supply unit is used to supply power to the battery management unit and the electrical control unit; the battery management unit is used to monitor the lithium battery energy storage module unit, and control the electrical control unit according to the monitoring data, through the The electrical control unit performs self-protection and self-recovery on the lithium battery energy storage module unit. The present invention can monitor the lithium battery energy storage module unit, and perform self-protection and self-recovery on the lithium battery energy storage module unit according to different monitoring data, so that the lithium battery energy storage system of the present invention has self-protection and self-recovery function, and the lithium battery energy storage system of the present invention is not complicated, the internal control is simple and convenient, and the cost is also very low, which is very convenient for large-scale application.
Description
技术领域technical field
本发明涉及一种锂电池储能系统，特别是涉及一种自保护与自恢复的锂电池储能系统。The invention relates to a lithium battery energy storage system, in particular to a self-protection and self-recovery lithium battery energy storage system.
背景技术Background technique
我国内蒙、新疆、青海等地区幅员辽阔，很多地区建设输电网络施工难度大、成本高，同时这些地区大多拥有较丰富的风力、光照等资源，解决其用电问题较好的办法就是建设分布式能源微网系统进行供电，然而风能和太阳能普遍具有间歇性、波动性和不稳定性，商业化应用尚有诸多不便，储能系统可以解决新能源发电的不稳定性、随机性的必需设备，可改善风、光发电供电质量。储能锂电池系统在寿命，能量，功率性能，以及高低温环境的使用性能方面具有显著优势，未来，作为离网型风光用储能系统在偏远地区、孤岛等无电网接入的地区将有大规模应用。my country's Inner Mongolia, Xinjiang, Qinghai and other regions have a vast territory, and the construction of transmission networks in many regions is difficult and costly. At the same time, most of these regions have relatively rich wind, light and other resources. A better way to solve their power consumption problems is to build distributed power grids. The energy micro-grid system supplies power. However, wind energy and solar energy are generally intermittent, volatile, and unstable, and there are still many inconveniences in commercial application. Energy storage systems can solve the instability and randomness of new energy power generation. It can improve the power supply quality of wind and photovoltaic power generation. The energy storage lithium battery system has significant advantages in terms of life, energy, power performance, and performance in high and low temperature environments. In the future, as an off-grid solar energy storage system, it will be used in remote areas, isolated islands and other areas without grid access. large-scale application.
但是现有技术中的锂电池储能系统很复杂，不便于规模化应用，并且内部控制很复杂，成本很高。However, the lithium battery energy storage system in the prior art is very complicated, which is not convenient for large-scale application, and the internal control is very complicated and the cost is high.
发明内容Contents of the invention
本发明要解决的技术问题是为了克服现有技术中锂电池储能系统很复杂，不便于规模化应用，并且内部控制很复杂，成本很高的缺陷，提供一种锂电池储能系统。The technical problem to be solved by the present invention is to provide a lithium battery energy storage system in order to overcome the defects in the prior art that the lithium battery energy storage system is complex, inconvenient for large-scale application, complicated internal control, and high in cost.
本发明是通过下述技术方案来解决上述技术问题的：The present invention solves the above technical problems through the following technical solutions:
本发明提供了一种锂电池储能系统，包括电池管理单元、锂电池储能模块单元、电源单元以及电气控制单元；The invention provides a lithium battery energy storage system, including a battery management unit, a lithium battery energy storage module unit, a power supply unit and an electrical control unit;
所述锂电池储能模块单元用于向所述电源单元供电，所述电源单元用于为所述电池管理单元和所述电气控制单元供电；The lithium battery energy storage module unit is used to supply power to the power supply unit, and the power supply unit is used to supply power to the battery management unit and the electrical control unit;
所述电池管理单元用于对所述锂电池储能模块单元进行监测，并根据监测数据控制所述电气控制单元，通过所述电气控制单元对所述锂电池储能模块单元进行自保护及自恢复。The battery management unit is used to monitor the lithium battery energy storage module unit, and control the electrical control unit according to the monitoring data, and perform self-protection and self-protection on the lithium battery energy storage module unit through the electrical control unit. recover.
较佳地，所述电池管理单元用于：Preferably, the battery management unit is used for:
在监测到所述锂电池储能模块单元的电压超过过充阀值时，通过所述电气控制单元控制所述锂电池储能模块单元仅对外放电；When it is detected that the voltage of the lithium battery energy storage module unit exceeds the overcharge threshold, the electrical control unit controls the lithium battery energy storage module unit to only discharge externally;
在监测到所述锂电池储能模块单元的电压低于过放阀值时，通过所述电气控制单元控制所述锂电池储能模块单元仅对内充电；When it is detected that the voltage of the lithium battery energy storage module unit is lower than the over-discharge threshold, the electrical control unit controls the lithium battery energy storage module unit to only charge internally;
在监测到所述锂电池储能模块单元的电压低于安全阀值时，通过所述电气控制单元切断所述锂电池储能模块单元向所述电源单元的供电。When it is detected that the voltage of the lithium battery energy storage module unit is lower than a safety threshold, the electric control unit cuts off the power supply of the lithium battery energy storage module unit to the power supply unit.
较佳地，所述电池管理单元用于：Preferably, the battery management unit is used for:
在监测到所述锂电池储能模块单元的电流高于过流阀值时，若是放电过流，则通过所述电气控制单元控制所述锂电池储能模块单元仅对内充电，若是充电过流，则通过所述电气控制单元控制所述锂电池储能模块单元仅对外放电。When it is detected that the current of the lithium battery energy storage module unit is higher than the overcurrent threshold, if the discharge is overcurrent, the electrical control unit is used to control the lithium battery energy storage module unit to only charge internally; flow, the electrical control unit controls the lithium battery energy storage module unit to only discharge externally.
较佳地，所述电池管理单元用于：Preferably, the battery management unit is used for:
在监测到所述锂电池储能模块单元的温度高于第一温度阀值或低于第二温度阀值时，通过所述电气控制单元控制所述锂电池储能模块单元工作在正常温度范围内。When it is detected that the temperature of the lithium battery energy storage module unit is higher than the first temperature threshold or lower than the second temperature threshold, the electrical control unit is used to control the lithium battery energy storage module unit to work in a normal temperature range Inside.
较佳地，所述电源单元还用于通过接入外激励源进行启动，在启动后唤醒所述电池管理单元，所述电池管理单元通过所述电气控制单元控制所述锂电池储能模块单元仅对内充电；Preferably, the power supply unit is also used to start by connecting an external excitation source, wake up the battery management unit after startup, and the battery management unit controls the lithium battery energy storage module unit through the electrical control unit Only charge internally;
当所述电池管理单元监测到所述锂电池储能模块单元的电压达到恢复阀值时，通过所述电气控制单元将所述电源单元由外激励源供电切换为由所述锂电池储能模块单元供电。When the battery management unit detects that the voltage of the lithium battery energy storage module unit reaches the recovery threshold, the electrical control unit switches the power supply unit from the external excitation source to the lithium battery energy storage module unit powered.
较佳地，所述电池管理单元还包括通讯接口，用于与外部主控通讯；Preferably, the battery management unit further includes a communication interface for communicating with an external main control;
所述电池管理单元还用于在与所述外部主控通讯确认后，再控制所述电气控制单元。The battery management unit is further configured to control the electric control unit after communicating with the external main control unit for confirmation.
较佳地，所述电气控制单元包括第一开关、第一直流接触器、第二直流接触器、第三直流接触器、第一二极管、第二二极管、第三二极管、第四二极管；Preferably, the electrical control unit includes a first switch, a first DC contactor, a second DC contactor, a third DC contactor, a first diode, a second diode, a third diode , the fourth diode;
所述第一直流接触器与所述第一二极管并联，所述第一直流接触器的一端与所述锂电池储能模块单元的正极电连接，另一端与所述第二直流接触器的一端电连接；The first DC contactor is connected in parallel with the first diode, one end of the first DC contactor is electrically connected to the positive pole of the lithium battery energy storage module unit, and the other end is electrically connected to the second DC contactor. One end of the contactor is electrically connected;
所述第二直流接触器与所述第二二极管并联，另一端通过总正动力接口与上级分布式能源系统相连，所述第一二极管的负极与所述第二二极管的负极相连；The second DC contactor is connected in parallel with the second diode, and the other end is connected to the upper-level distributed energy system through the total positive power interface, and the cathode of the first diode is connected to the second diode. Negative connection;
所述第三直流接触器的一端与所述锂电池储能模块单元的正极电连接，另一端与所述第三二极管的正极相连，所述第三二极管的负极与所述第四二极管的负极相连，所述第四二极管的正极与所述总正动力接口相连；One end of the third DC contactor is electrically connected to the anode of the lithium battery energy storage module unit, the other end is connected to the anode of the third diode, and the cathode of the third diode is connected to the anode of the first The cathodes of the four diodes are connected, and the anode of the fourth diode is connected with the total positive power interface;
所述第一开关的一端与所述第三二极管的负极相连，另一端与所述电源单元相连；One end of the first switch is connected to the cathode of the third diode, and the other end is connected to the power supply unit;
所述锂电池储能模块单元的负极通过总负动力接口与上级分布式能源系统相连。The negative electrode of the lithium battery energy storage module unit is connected to the upper-level distributed energy system through the total negative power interface.
较佳地，所述锂电池储能模块单元的负极还通过熔丝与上级分布式能源系统相连。Preferably, the negative electrode of the lithium battery energy storage module unit is also connected to the upper-level distributed energy system through a fuse.
较佳地，所述电气控制单元还包括自恢复开关，用于在闭合时控制所述电源单元强制从所述锂电池储能模块单元取电，启动所述电源单元为所述电池管理单元供电。Preferably, the electrical control unit further includes a self-recovery switch, which is used to control the power supply unit to forcibly take power from the lithium battery energy storage module unit when it is closed, and start the power supply unit to supply power to the battery management unit .
较佳地，所述电气控制单元还包括电流传感器。Preferably, the electrical control unit further includes a current sensor.
较佳地，所述电池管理单元包括一个BCU(电池控制单元)和两个BMU(电池管理单元)；和/或；所述锂电池储能模块单元包括四个串联的26.4V/80Ah钛酸锂电池储能模块；和/或，所述电源单元为24V直流电源。Preferably, the battery management unit includes a BCU (Battery Control Unit) and two BMUs (Battery Management Unit); and/or; the lithium battery energy storage module unit includes four 26.4V/80Ah titanic acid in series A lithium battery energy storage module; and/or, the power supply unit is a 24V DC power supply.
本发明的积极进步效果在于：本发明能够对锂电池储能模块单元进行监测，并根据不同的监测数据来对锂电池储能模块单元进行自保护和自恢复，从而使得本发明的锂电池储能系统具有自保护和自恢复的功能，并且本发明的锂电池储能系统并不复杂，内部控制简单方便，成本也很低，非常便于规模化应用。The positive progress effect of the present invention is that the present invention can monitor the lithium battery energy storage module unit, and perform self-protection and self-recovery on the lithium battery energy storage module unit according to different monitoring data, so that the lithium battery storage module unit of the present invention The energy system has the functions of self-protection and self-recovery, and the lithium battery energy storage system of the present invention is not complicated, the internal control is simple and convenient, and the cost is also very low, which is very convenient for large-scale application.
附图说明Description of drawings
图1为本发明的较佳实施例的锂电池储能系统的模块示意图。FIG. 1 is a block diagram of a lithium battery energy storage system according to a preferred embodiment of the present invention.
图2为本发明的较佳实施例的锂电池储能系统的电路连接示意图。Fig. 2 is a schematic diagram of circuit connection of a lithium battery energy storage system according to a preferred embodiment of the present invention.
具体实施方式detailed description
下面通过实施例的方式进一步说明本发明，但并不因此将本发明限制在所述的实施例范围之中。The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.
如图1所示，本发明的锂电池储能系统包括电池管理单元1、锂电池储能模块单元2、电源单元3以及电气控制单元4；As shown in Figure 1, the lithium battery energy storage system of the present invention includes a battery management unit 1, a lithium battery energy storage module unit 2, a power supply unit 3 and an electrical control unit 4;
其中，所述锂电池储能模块单元2用于向所述电源单元3供电，所述电源单元3用于为所述电池管理单元1和所述电气控制单元4供电；Wherein, the lithium battery energy storage module unit 2 is used to supply power to the power supply unit 3, and the power supply unit 3 is used to supply power to the battery management unit 1 and the electrical control unit 4;
所述电池管理单元1用于对所述锂电池储能模块单元2进行监测，以监测所述锂电池储能模块单元2的运行数据与健康状态，然后根据监测数据控制所述电气控制单元4，通过所述电气控制单元4对所述锂电池储能模块单元2进行自保护及自恢复。其中，优选地，所述电池管理单元1可以包括一个BCU和两个BMU，在具体实施过程中可以通过BMU进行监测，监测数据由BCU汇总，实施相应的控制与保护策略。The battery management unit 1 is used to monitor the lithium battery energy storage module unit 2 to monitor the operation data and health status of the lithium battery energy storage module unit 2, and then control the electrical control unit 4 according to the monitoring data , performing self-protection and self-recovery on the lithium battery energy storage module unit 2 through the electrical control unit 4 . Wherein, preferably, the battery management unit 1 may include one BCU and two BMUs, and the BMU may be used for monitoring during the specific implementation process, and the monitoring data shall be collected by the BCU to implement corresponding control and protection strategies.
本发明的锂电池储能系统的自保护与自恢复功能具体如下：The self-protection and self-recovery functions of the lithium battery energy storage system of the present invention are specifically as follows:
在监测到所述锂电池储能模块单元2的电压超过过充阀值(V1)时，所述电池管理单元1通过所述电气控制单元4控制所述锂电池储能模块单元2仅对外放电，从而确保电池组不过充；When it is detected that the voltage of the lithium battery energy storage module unit 2 exceeds the overcharge threshold (V1), the battery management unit 1 controls the lithium battery energy storage module unit 2 to only discharge externally through the electrical control unit 4 , so as to ensure that the battery pack is not fully charged;
在监测到所述锂电池储能模块单元2的电压低于过放阀值(V2)时，所述电池管理单元1通过所述电气控制单元4控制所述锂电池储能模块单元2仅对内充电，从而确保电池组不过放；When it is detected that the voltage of the lithium battery energy storage module unit 2 is lower than the over-discharge threshold (V2), the battery management unit 1 controls the lithium battery energy storage module unit 2 to only Internal charging, so as to ensure that the battery pack is not discharged;
在监测到所述锂电池储能模块单元2的电压低于安全阀值(V3)时，所述电池管理单元1通过所述电气控制单元4切断所述锂电池储能模块单元2向所述电源单元3的供电，从而所述电源单元3不再从所述锂电池储能模块单元2取电，确保电池组安全。When it is detected that the voltage of the lithium battery energy storage module unit 2 is lower than the safety threshold (V3), the battery management unit 1 cuts off the supply of the lithium battery energy storage module unit 2 to the The power supply of the power supply unit 3, so that the power supply unit 3 no longer takes power from the lithium battery energy storage module unit 2, ensuring the safety of the battery pack.
在监测到所述锂电池储能模块单元2的电流高于过流阀值(I1)时，若是放电过流，则所述电池管理单元1通过所述电气控制单元4控制所述锂电池储能模块单元2仅对内充电，若是充电过流，则所述电池管理单元1通过所述电气控制单元4控制所述锂电池储能模块单元2仅对外放电，从而实现了过流保护。When it is detected that the current of the lithium battery energy storage module unit 2 is higher than the overcurrent threshold (I1), if the discharge overcurrent occurs, the battery management unit 1 controls the lithium battery energy storage unit 2 through the electrical control unit 4. The energy module unit 2 is only charged internally. If the charging is over-current, the battery management unit 1 controls the lithium battery energy storage module unit 2 to only discharge externally through the electrical control unit 4, thereby realizing over-current protection.
在监测到所述锂电池储能模块单元2的温度高于第一温度阀值(T1)或低于第二温度阀值(T2)时，通过所述电气控制单元4控制所述锂电池储能模块单元2工作在正常温度范围内，从而保护电池组的寿命。When it is detected that the temperature of the lithium battery energy storage module unit 2 is higher than the first temperature threshold (T1) or lower than the second temperature threshold (T2), the electrical control unit 4 controls the lithium battery energy storage The module unit 2 can work in a normal temperature range, thereby protecting the life of the battery pack.
从而所述电池管理单元1通过控制所述电气控制单元4，实现了对所述锂电池储能模块单元2的过充、过放、过流、温度保护，进而实现了对所述锂电池储能模块单元2的自保护。Thus, the battery management unit 1 realizes overcharging, overdischarging, overcurrent, and temperature protection of the lithium battery energy storage module unit 2 by controlling the electrical control unit 4, thereby realizing the protection of the lithium battery energy storage module unit 2. Self-protection of energy module unit 2.
另外，所述电源单元3还用于通过接入外激励源(包括市电、备用电源、光伏发电或风力发电等)进行启动，在启动后唤醒所述电池管理单元1，所述电池管理单元1通过所述电气控制单元4控制所述锂电池储能模块单元2仅对内充电；In addition, the power supply unit 3 is also used to start by connecting to an external excitation source (including mains power, backup power, photovoltaic power generation or wind power generation, etc.), wake up the battery management unit 1 after startup, and the battery management unit 1. Control the lithium battery energy storage module unit 2 to only charge internally through the electrical control unit 4;
当所述电池管理单元1监测到所述锂电池储能模块单元2的电压达到恢复阀值(V4)时，通过所述电气控制单元4将所述电源单元3由外激励源供电切换为由所述锂电池储能模块单元2供电，从而完成自恢复的过程，使得所述锂电池储能模块单元2进入正常工作状态。When the battery management unit 1 detects that the voltage of the lithium battery energy storage module unit 2 reaches the recovery threshold (V4), the power supply unit 3 is switched from being powered by an external excitation source to being powered by the electric control unit 4. The lithium battery energy storage module unit 2 supplies power to complete the self-recovery process, so that the lithium battery energy storage module unit 2 enters a normal working state.
这样，通过控制所述电气控制单元4，实现了所述电源单元3从所述锂电池储能模块单元2或外部电源(即外激励源)取电的自动切换，并且能够在所述锂电池储能模块单元2低电压保护后，通过外激励源唤醒所述电池管理单元1实现自恢复，保护所述锂电池储能模块单元2的同时，方便了用户的使用。In this way, by controlling the electrical control unit 4, the automatic switching of the power supply unit 3 from the lithium battery energy storage module unit 2 or the external power supply (ie, the external excitation source) is realized, and the lithium battery can After the low-voltage protection of the energy storage module unit 2, the battery management unit 1 is awakened by an external excitation source to realize self-recovery, which protects the lithium battery energy storage module unit 2 and facilitates the use of the user.
在本发明具体实施过程中，所述电池管理单元1还可以包括通讯接口(具体为CAN通讯接口)，用于与外部主控通讯；所述电池管理单元1还用于在与所述外部主控通讯确认后，再控制所述电气控制单元4，从而使得上述所有的自保护功能都增加了相应的延时保护，若外部需要互动，则在所述电池管理单元1与外部主控通讯确认后，再执行最终的保护动作；若外部不需要互动，则由所述电池管理单元1自主执行最终的保护动作。In the specific implementation process of the present invention, the battery management unit 1 may also include a communication interface (specifically, a CAN communication interface) for communicating with an external main control; the battery management unit 1 is also used for communicating with the external main control After the control communication is confirmed, then control the electrical control unit 4, so that all the above self-protection functions have added corresponding delay protection. If the external interaction is required, the battery management unit 1 and the external main control communication confirmation Afterwards, the final protection action is executed; if no external interaction is required, the battery management unit 1 automatically executes the final protection action.
如图2所示，在本实施例中，所述电气控制单元具体包括：第一开关k0、第一直流接触器k1、第二直流接触器k2、第三直流接触器k3、第一二极管D1、第二二极管D2、第三二极管D3、第四二极管D4、自恢复开关B1以及熔丝FU1；As shown in Figure 2, in this embodiment, the electrical control unit specifically includes: a first switch k0, a first DC contactor k1, a second DC contactor k2, a third DC contactor k3, a first two Diode D1, second diode D2, third diode D3, fourth diode D4, self-recovery switch B1 and fuse FU1;
其中，所述第一直流接触器k1与所述第一二极管D1并联，所述第一直流接触器k1的一端与所述锂电池储能模块单元2的正极电连接，另一端与所述第二直流接触器k2的一端电连接；Wherein, the first DC contactor k1 is connected in parallel with the first diode D1, one end of the first DC contactor k1 is electrically connected to the anode of the lithium battery energy storage module unit 2, and the other end electrically connected to one end of the second DC contactor k2;
所述第二直流接触器k2与所述第二二极管D2并联，另一端通过总正动力接口(PM)与上级分布式能源系统相连，所述第一二极管D1的负极与所述第二二极管D2的负极相连；The second DC contactor k2 is connected in parallel with the second diode D2, and the other end is connected to the upper-level distributed energy system through the total positive power interface (PM), and the cathode of the first diode D1 is connected to the The cathode of the second diode D2 is connected;
所述第三直流接触器k3的一端与所述锂电池储能模块单元2的正极电连接，另一端与所述第三二极管D3的正极相连，所述第三二极管D3的负极与所述第四二极管D4的负极相连，所述第四二极管D4的正极与所述总正动力接口(PM)相连；One end of the third DC contactor k3 is electrically connected to the positive pole of the lithium battery energy storage module unit 2, the other end is connected to the positive pole of the third diode D3, and the negative pole of the third diode D3 It is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the total positive power interface (PM);
所述第一开关k0的一端与所述第三二极管D3的负极相连，另一端与所述电源单元3相连；One end of the first switch k0 is connected to the cathode of the third diode D3, and the other end is connected to the power supply unit 3;
所述锂电池储能模块单元2的负极经所述熔丝FU1通过总负动力接口(NM)与上级分布式能源系统相连。其中GND表示接地。The negative pole of the lithium battery energy storage module unit 2 is connected to the upper-level distributed energy system through the fuse FU1 through the total negative power interface (NM). Among them, GND means grounding.
本发明利用上述电路实现锂电池储能系统的自保护功能及自恢复功能的控制具体如下：The present invention utilizes the above circuit to realize the control of the self-protection function and the self-recovery function of the lithium battery energy storage system as follows:
关于自保护功能About the self-protection function
1、过充保护：当监测到所述锂电池储能模块单元2的电压超过过充阀值(V1)时，所述电池管理单元1通过数字量输出(简称DO)控制第一直流接触器k1断开，由于与第一直流接触器k1并联的第一二极管D1的单向导通作用，此时所述锂电池储能模块单元2的电池组只能对外放电，不接受外部对内的充电，从而确保电池组不过充；1. Overcharge protection: When it is detected that the voltage of the lithium battery energy storage module unit 2 exceeds the overcharge threshold (V1), the battery management unit 1 controls the first DC contact through a digital output (referred to as DO). switch k1 is disconnected, due to the unidirectional conduction effect of the first diode D1 connected in parallel with the first DC contactor k1, the battery pack of the lithium battery energy storage module unit 2 can only discharge externally at this time, and does not accept external Internal charging, so as to ensure that the battery pack is not overcharged;
2、过放保护：当监测到所述锂电池储能模块单元2的电压低于过放阀值(V2)时，所述电池管理单元1通过DO控制第二直流接触器k2断开，由于与第二直流接触器k2并联的第二二极管D2的单向导通作用，此时所述锂电池储能模块单元2的电池组只能接受外部对内的充电，不能对外放电，从而确保电池组不过放；2. Over-discharge protection: When it is detected that the voltage of the lithium battery energy storage module unit 2 is lower than the over-discharge threshold (V2), the battery management unit 1 controls the second DC contactor k2 to disconnect through DO, because The unidirectional conduction effect of the second diode D2 connected in parallel with the second DC contactor k2, at this time, the battery pack of the lithium battery energy storage module unit 2 can only accept external internal charging, and cannot be discharged externally, thereby ensuring The battery pack is not discharged;
3、安全保护：当监测到所述锂电池储能模块单元2的电压低于安全阀值(V3)时，所述电池管理单元1通过DO控制第三直流接触器k3断开，从而所述电源单元3不再从所述锂电池储能模块单元2取电，保护电池组安全；3. Safety protection: when it is detected that the voltage of the lithium battery energy storage module unit 2 is lower than the safety threshold (V3), the battery management unit 1 controls the third DC contactor k3 to disconnect through DO, so that the The power supply unit 3 no longer takes power from the lithium battery energy storage module unit 2 to protect the safety of the battery pack;
4、过流保护：当监测到所述锂电池储能模块单元2的电流高于过流阀值(I1)时，若是放电过流，则所述电池管理单元1通过DO控制第二直流接触器k2断开，若是充电过流，则所述电池管理单元1通过DO控制第一直流接触器k1断开，从而实现了过流保护；4. Overcurrent protection: When it is detected that the current of the lithium battery energy storage module unit 2 is higher than the overcurrent threshold (I1), if the discharge overcurrent occurs, the battery management unit 1 controls the second DC contact through DO If the charging overcurrent occurs, the battery management unit 1 controls the first DC contactor k1 to be disconnected through DO, thereby realizing overcurrent protection;
5、温度保护：当监测到所述锂电池储能模块单元2的温度高于第一温度阀值(T1)或低于第二温度阀值(T2)时，所述电池管理单元1通过DO控制第一直流接触器k1和第二直流接触器k2同时断开，从而进行温度保护，以确保电池组在正常的温度范围内运行，保护电池组的寿命。5. Temperature protection: When it is detected that the temperature of the lithium battery energy storage module unit 2 is higher than the first temperature threshold (T1) or lower than the second temperature threshold (T2), the battery management unit 1 will pass DO The first DC contactor k1 and the second DC contactor k2 are controlled to be disconnected at the same time, so as to perform temperature protection, so as to ensure that the battery pack operates within a normal temperature range and protect the life of the battery pack.
关于自恢复功能About self-recovery function
首先，接入外激励源，通过第四二极管D4和第一开关k0，启动所述电源单元3；Firstly, an external excitation source is connected, and the power supply unit 3 is activated through the fourth diode D4 and the first switch k0;
然后，由所述电源单元3唤醒所述电池管理单元1，然后所述电池管理单元1通过DO控制第二直流接触器k2断开、第一直流接触器k1闭合、第三直流接触器k3断开，使得外激励源只能对所述锂电池储能模块单元2进行充电；Then, the battery management unit 1 is awakened by the power supply unit 3, and then the battery management unit 1 controls the second DC contactor k2 to be disconnected, the first DC contactor k1 to be closed, and the third DC contactor k3 to be controlled by the DO. disconnected, so that the external excitation source can only charge the lithium battery energy storage module unit 2;
接着，当所述锂电池储能模块单元2的电压达到恢复阀值(V4)时，所述电池管理单元1通过DO控制第三直流接触器k3闭合，使得所述电源单元3的供电由外激励源供电切换为由所述锂电池储能模块单元2供电，同时闭合第二直流接触器k2，完成自恢复的过程，使得锂电池储能系统进入正常工作状态。Next, when the voltage of the lithium battery energy storage module unit 2 reaches the recovery threshold (V4), the battery management unit 1 controls the third DC contactor k3 to close through DO, so that the power supply unit 3 is powered by the external The power supply of the excitation source is switched to the lithium battery energy storage module unit 2, and at the same time, the second DC contactor k2 is closed to complete the self-recovery process, so that the lithium battery energy storage system enters a normal working state.
另外，所述自恢复开关B1则用于在闭合时控制所述电源单元3强制从所述锂电池储能模块单元2取电，启动所述电源单元3为所述电池管理单元1供电。In addition, the self-recovery switch B1 is used to control the power supply unit 3 to forcibly take power from the lithium battery energy storage module unit 2 when it is closed, and start the power supply unit 3 to supply power to the battery management unit 1 .
在本发明的具体实施过程中，所述电气控制单元4还可以包括电流传感器。另外，所述锂电池储能模块单元2可包括四个串联的26.4V/80Ah钛酸锂电池储能模块，从而构成一个105.6V/80Ah的钛酸锂储能单元；所述电源单元3具体可以为一个24V的直流电源，从所述锂电池储能模块单元2或外部电源取电，外部电源具体是指分布式能源太阳能发电。During the specific implementation of the present invention, the electrical control unit 4 may also include a current sensor. In addition, the lithium battery energy storage module unit 2 may include four 26.4V/80Ah lithium titanate battery energy storage modules connected in series to form a 105.6V/80Ah lithium titanate energy storage unit; the power supply unit 3 specifically It can be a 24V DC power supply, which can be powered from the lithium battery energy storage module unit 2 or an external power supply, and the external power supply specifically refers to distributed energy solar power generation.
在本发明中，通过所述总正动力接口和所述总负动力接口，本发明的锂电池储能系统能够为分布式能源系统提供电气储能，起三方面作用：1)为分布式能源系统的控制系统提供电能；2)为负载提供电能；3)可平滑风力和太阳能发电的波动性和不稳定性，提高风力发电和太阳能发电质量。In the present invention, through the total positive power interface and the total negative power interface, the lithium battery energy storage system of the present invention can provide electrical energy storage for the distributed energy system, which plays three roles: 1) as a distributed energy The control system of the system provides electric energy; 2) provides electric energy for the load; 3) can smooth the fluctuation and instability of wind power and solar power generation, and improve the quality of wind power generation and solar power generation.
通过所述电气控制单元4可以在所述锂电池储能模块单元2发生故障时自动切断负载并进行报警；在所述锂电池储能模块单元2故障修复后，可通过所述自恢复开关B1进行启动；The electrical control unit 4 can automatically cut off the load and give an alarm when the lithium battery energy storage module unit 2 fails; after the failure of the lithium battery energy storage module unit 2 is repaired, the self-recovery switch B1 can to start;
通过所述电气控制单元4还可以在所述锂电池储能模块单元2的电能耗尽至保护值时，自动切断负载，保护所述锂电池储能模块单元2防止其过放；在这种情况下，锂电池储能系统可接受分布式能源系统为其直接充电到正常启用阀值。The electric control unit 4 can also automatically cut off the load when the electric energy of the lithium battery energy storage module unit 2 is exhausted to a protection value, so as to protect the lithium battery energy storage module unit 2 from over-discharging; Under certain circumstances, the lithium battery energy storage system can accept the distributed energy system to charge it directly to the normal activation threshold.
虽然以上描述了本发明的具体实施方式，但是本领域的技术人员应当理解，这些仅是举例说明，本发明的保护范围是由所附权利要求书限定的。本领域的技术人员在不背离本发明的原理和实质的前提下，可以对这些实施方式做出多种变更或修改，但这些变更和修改均落入本发明的保护范围。Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
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