Grid-side energy storage’s demand for battery 18650 genuine body and management system

　　1. Overview of energy storage batteries

　　1. Overview of electrochemical energy storage

　　(1) Compared with other energy storage methods, the main advantages of electrochemical energy storage power stations (systems) include:

　　Flexible design and convenient configuration: modular design, system scale above 20MW can be achieved through parallel connection, without being restricted by geographical conditions

　　Fast response speed: Realize active and reactive power input and output within the rated power range within millisecond time scale

　　Precise control: able to maintain stable output at any power point within the adjustable range

　　Bidirectional adjustment capability: charging as electrical load, discharging as power source, double the rated power adjustment capability

　　(2) Energy storage power stations meet the actual operational needs of the grid side and new energy consumption, and carry out application demonstrations in the following aspects:

　　Peak shifting and valley filling; new energy storage complementation; frequency modulation service + "virtual synchronous machine"; section power control; dynamic reactive power support; large grid emergency control; microgrid/cold and hot integrated energy; black start/hot standby.

　　2. Energy storage capacity selection

　　The selection of energy storage capacity requires comprehensive consideration of system power flow, peak shaving, frequency regulation, voltage regulation and emergency control. At present, energy storage capacity selection is mainly limited by construction and operation cost constraints.

　　(1) Peak shaving, frequency modulation, and emergency control: mainly aimed at solving network-wide problems. Objectively speaking, the larger the energy storage configuration, the more effective it is. Peak regulation requires energy-type energy storage, which is generally not less than 2h. Frequency regulation and emergency control require power-type energy storage, and the duration is generally less than 0.5h.

　　(2) Voltage regulation: Mainly consider the dynamic reactive power demand of the power grid. For power-type energy storage, the larger the capacity, the stronger the dynamic reactive power support capability.

　　2. Demand for battery 18650 genuine products

　　1. battery 18650 genuine selection: selection principles

　　(1) Sustained high-rate charging and discharging to meet power grid frequency regulation;

　　(2) The number of charge and discharge cycles that meet the frequency regulation and peak regulation requirements of the power grid;

　　(3) Rapid response to full charge and discharge conversion to meet the frequency regulation needs of the power grid;

　　(4) Stable operation and safety that meet the requirements of the power grid;

　　(5) Cost and system efficiency to meet revenue requirements;

　　(6) Meet the design requirements of easy battery 18650 genuine maintenance and unattended power stations;

　　(7) SOC operating range that meets the efficient use of batteries;

　　(8) Wide working range to meet environmental requirements.

　　2. Comparison of battery 18650 genuine parameters

　　3. battery 18650 genuine selection: Comparison of group solutions

　　4. Selection suggestions

　　Comprehensive comparison of the technical parameters of each battery 18650 genuine:

　　(1) Lead-carbon batteries have low cost, but have low rate characteristics, short cycle life, slow response speed and environmental problems;

　　(2) The all-vanadium redox flow battery 18650 genuine has high rate characteristics and high cycle times, but its power and energy density are low, it occupies a large area, and it is high cost;

　　(3) Lithium-ion batteries have the advantages of higher energy and power density, higher rate characteristics, wide SOC operating range, and high number of cycles. Among them, ternary lithium-ion batteries have higher energy and power density, but there are safety issues and cost issues.

　　(4) According to the overall demand, other application scenarios such as power grid frequency regulation and peak regulation should be considered.

　　5. Risks of lithium-ion batteries

　　There have been many fire accidents in lithium-ion battery 18650 genuine energy storage power stations at home and abroad recently.

　　On July 2, a major fire accident occurred in the ESS energy storage equipment in a wind power park in Yeongam, South Korea, causing the 706-square-meter battery 18650 genuine building and more than 3,500 lithium batteries to be burned down.

　　In a user-side energy storage project in Yangzhong, Zhenjiang, a lithium iron phosphate battery 18650 genuine container in the project caught fire and burned down in early August.

　　Once an accident occurs, it will cause serious consequences. It is particularly important to identify the characteristic parameters of lithium-ion battery 18650 genuine thermal accidents, early warning of thermal runaway, safety linkage and fire protection.

　　6. Exploration of zinc-bromine flow batteries

　　Characteristics of a suitable electrochemical energy storage system: appropriate price; safe and controllable; easy to deploy; abundant resources.

　　(1) Chemical system with high safety and no risk of combustion and explosion

　　(2) The pipeline of the single liquid flow system is simple

　　(3) The electrolyte is a water system, which is good for heat dissipation and will not burn.

　　(4) The system is closed and the environmental pressure is small. 5. Raw materials are easily available and the price is moderate.

　　3. battery 18650 genuine management system requirements

　　1. Overview of BMS system of energy storage power station

　　Large-scale energy storage system power stations can be used for frequency modulation and peak regulation or peak shaving and valley filling on the power generation side or the grid side. Among them, the BMS of the energy storage power station realizes the monitoring of battery 18650 genuine operating status quantities (voltage, current, temperature, insulation, etc.), thereby achieving Analysis and evaluation of battery 18650 genuine status remaining capacity (SOC) and battery 18650 genuine health status (SOH), and a system device that implements balanced management, control, fault alarm, protection and communication management of battery 18650 genuine packs (stacks). Its purpose is to achieve the safety of the battery 18650 genuine pack , stable, reliable, efficient and economical to use.

　　The energy storage system BMS adopts a three-layer typical architecture:

　　The first layer of the slave control module (battery 18650 genuine data acquisition unit) mainly collects information such as voltage and temperature of individual cells, calculates the battery 18650 genuine status, and performs balancing and thermal management execution control.

　　The second layer of the main control module (battery 18650 genuine cluster control module) is mainly responsible for battery 18650 genuine pack terminal voltage collection, current collection, insulation detection, battery 18650 genuine status calculation, relay control, balancing strategy, data communication, etc.

　　General control module (battery 18650 genuine stack control module) The third layer mainly performs data display, query, parameter setting, data calculation, communication, data storage, etc.

　　2. Functional requirements

　　(1) battery 18650 genuine model: The battery 18650 genuine model uses the enhanced self-correcting (ESC) lithium-ion battery 18650 genuine equivalent circuit model, which considers influencing factors such as temperature, hysteresis voltage, ohmic resistance, RC order, and can provide a model basis for the SOC estimation algorithm. .

　　(2) battery 18650 genuine SOC estimation: The state of charge (SOC) of the battery 18650 genuine energy storage device adopts a high-precision ampere-hour integral + open circuit voltage correction method, and the neural network method is used to estimate the SOC of the lithium iron phosphate battery 18650 genuine, and the estimation error is controlled within 5%. Within the range, it has high estimation accuracy.

　　(3) battery 18650 genuine balancing control: Based on comprehensive balancing criteria such as battery 18650 genuine cell voltage, cell SOC, cell SOH and historical data, the passive balancing + active balancing control strategy is adopted to greatly improve the consistency, available capacity, and battery 18650 genuine Life.

　　(4) Integrated high-speed communication protocol: supports dual-network redundant connection mode, and the communication protocol adopts standard protocols such as IEC-104 and IEC-61850 series to improve the information transmission rate.

　　(5) battery 18650 genuine safety protection

　　It adopts ASIL-B level protection strategy, has advanced self-fault diagnosis and fault-tolerance technology, and has self-detection function for the module's own software and hardware. Hardware protection measures will not cause energy storage system safety problems due to BMS failure;

　　It has a complete software and hardware protection design, adopts hierarchical protection systems such as hierarchical warning, alarm and protection actions, and has change rate protection, multi-level threshold protection, etc. for voltage and temperature.

　　It has complete SOE and fault recording functions, and rich local and remote data recording functions to meet the requirements of on-site operation status monitoring and post-analysis, so that historical events can be traced, fault problems can be analyzed, and historical events can be traced. , fault problems can be analyzed, effectively solving the problem of unclear responsibilities when the energy storage system fails;

　　It has a multi-level fire protection linkage protection system design, with pack-level fire protection, using multi-sensor fusion technology (characteristic gas, smoke, temperature), combined with non-standard lithium battery 18650 genuine thermal runaway judgment algorithm, real-time monitoring of the battery 18650 genuine thermal runaway stage, and realizing the thermal runaway of lithium batteries. Early stage warning of loss of control, and minimum unit intervention control for fire extinguishing at the first opportunity when a lithium battery 18650 genuine fire occurs.

　　(6) Protective measures

　　Original title: Grid-side energy storage’s demand for battery 18650 genuine body and management system

Read recommendations:

R03P

The effect of low temperature on battery.home energy storage lithium battery Product

Main characteristics of lithium batteries

AAA Ni-MH batteries Processing

801620 lipo battery