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Electric energy storage power battery system

The products are widely used in various occasions of electrical energy storage, such as grid energy storage, peak shaving and frequency regulation, load regulation, distributed generation, micro-grid, data center, telecommunication base station, UPS, residential energy storage, railroad/subway, mobile energy storage. The product covers micro-/small-energy storage devices, standard cabinets storage equipment, container storage facilities, large and super large scale integrated energy storage system.


Smoothing output fluctuations of renewable energy

Disadvantages of power generation with wind energy, solar energy and other renewable energy include irregularity, interruption and instability. By introducing energy storage system into the wind or solar power generation system, output fluctuations of wind or PV power generation can be smoothed and the impact on power grid can be reduced. Besides, introduction of energy storage system can also effectively reduce the phenomena of light and wind curtailment which occur frequently in wind and PV power generation.

CATL-solution

Based on the features of irregular and interruptible output in wind or solar power generation, CATL provides a lithium-ion energy system which can smooth the output fluctuations of wind and PV power generation and effectively solve the problem of severe limitation of wind and PV power generation systems.

Characteristic and advantages of the solution

Limiting light and wind curtailment and improving economic efficiency Reducing rate of change of instantaneous power and impact on power grid Tracking planned dispatching and improving controllability of grid connection Improving power generation forecasting accuracy and increasing hospitality of grid connection Independently developed battery and system monitoring software can operate autonomously without attention of staff

Frequency regulation of power grid

The conventional power system has been criticized in slow response to stabilization of power grid. The battery energy storage system introduced can aid the conventional power system and AGC equipment in quick response to instructions for frequency regulation and voltage regulation and thus improve stability of power grid.

CATL-solution


When power supply falls short of demand and frequency of power grid is low, the power grid company will send AGC power discharge request dispatching instruction to the battery system, which will discharge power according to the dispatching instruction it receives and the demand for discharge power. When power supply exceeds supply and frequency of power grid is high, the power grid company will send AGC charging request dispatching instruction, and the latter will conduct charging according to the dispatching instruction it receives and the demand for charging power so as to stabilize frequency of power grid.

Characteristic and advantages of the solution

Capable of responding to instructions for frequency regulation and voltage regulation, ensuring switching of charging and discharging within 50ms Modular design adopted to facilitate installation, commissioning, maintenance and system expansion Automobile-level battery management system adopted to guarantee safety and reliability of product Special on-line battery balancing technology and control pattern With independently developed battery and system monitoring software, the system can operate autonomously without attention of staff

Applications for power transmission and distribution

Power compensation and line loss compensation

Along with continuous deployment of power generation for wind, solar and other renewable energies of the power generation side, the demand of the customer side for power supply keeps growing. At present, existing power transmission and distribution lines are faced with great stress due to increasingly increased difference in peak and valley loads. As a result, it is urgent to find a solution which can save time, costs and have high dependability to solve the problems encountered by the existing power transmission and distribution network. Thus, an advanced battery storage system is an effective way to reliably and economically solve these problems.

CATL-solution

A proper battery energy storage system is set up in the power transmission and distribution network. In the valley period, the battery energy storage system performs energy storage as the load; in the peak period, it performs energy release as the power supply so as to solve the problem of the existing power transmission and distribution lines that power load becomes insufficient in the peak period while utilization of power transmission and distribution line becomes lower in the valley period. In this way, overall power transmission and distribution efficiency will be improved. Besides, in case of local failure of the transmission network, the energy storage can be utilized to supply power continuously to ensure normal transmission of power.

Characteristic and advantages of the product solution

Reducing the investment on equipment of transmission and distribution network and increasing utilization rate of the equipment Effectively reducing current of the power transmission network in the peak period and thus reducing loss of power transmission line Modular design of energy storage product adopted to quicken the system integration process and facilitate installation and commissioning Independently developed automobile-level battery management system adopted to ensure high safety and dependability of the system With independently developed battery and system monitoring software, the system can operate autonomously without attention of staff

Applications for power consumption

Micro-grid energy storage

The power systems set up on islands or in remote areas are usually lack of stability, where intermittent power failure and shortage occur frequently. Under these conditions, diesel power generation is usually adopted, which not only results in higher costs, but also causes severe environmental pollution and noise. After introduction of distributed PV energy storage system into the islands and remote areas, the problem of unstable power supply in these areas can be solved effectively.

CATL-solution

The battery system unit realizes conversion of AC and DC power through a bi-directional converter by using a lithium battery as the energy storage unit. In the PV power generation system, the PV component converts solar energy into DC power and then converts it into AC power through a PV inverter. The battery energy storage system, PV power generation system and power consumption system adopts parallel connection at the AC bus side, which are connected to the external main power grid through a smart distribution cabinet. The on-grid and off-grid states can be independently switched.

Characteristic and advantages of the product solution:

Proper integration of the PV power generation system and the battery energy storage system resulting in higher power generation efficiency On-grid and off-grid functions provided to realize independent switching between on-grid and off-grid states Convenience for expansion of the PV power generation system and the battery energy storage system, based on which greater power consumption demand can be satisfied depending on increase of load Reserved interface with the main power grid making it possible to interconnect the facilities depending on the need and integrate the micro-grids of many villages into the main power grid Intelligent battery management system enabling real-time remote monitoring and data downloading via InternetModular design for the battery system resulting in orderly and pleasant appearance and convenience for maintenance

Commercial energy storage

Industries including electrolysis, electroplating and metallurgy and transport sections including tramcar, light rail and subway are the highly-centralized big consumers of power. After energy storage systems are installed, they are charged by using the valley power at low tariff in the valley period and then release the power stored in them for the use of production and operation of plants or enterprise departments in the peak period of power consumption, which will not only greatly ease the burden of the power grid, but also effectively reduce the operational costs. In addition, certain quantity of lithium battery energy storage systems can be provided in buildings or plants as the emergency backup power supplies in case intermittent power failure occurs in these places. Peak value is controlled and peak power is reduced to reduce the cost for peak consumption at the same time of ensuring the connecting power does not exceed the load and thus guaranteeing safety of the system. Power of connecting line may be reduced to save the costs.

CATL-solution


The CATL large-sized/commercial lithium battery energy storage system realizes conversion of AC/DC electric energy and power flow control through a bi-directional converter by using the phosphorous battery unit as the energy storage component. Multiple bi-directional converters (PCS) are connected in parallel manner at the LV tie bus and integrated into the power grid through the transformer in the distribution room.According to the way of installation and use, CATL large-sized lithium battery energy storage system can be divided into two categories: container mobile type energy storage system and indoor fixed type energy storage system.

Characteristic and advantages of the product solution:

Standardized modular designed adopted to facilitate system integration, installation and commissioning High-strength structural designed adopted to guarantee safety in long-term transportation and under extreme conditions (e.g. earthquake) Independently developed automobile-level battery management system adopted Adopting CATL-specific on-line battery balancing technology and control pattern With independently developed battery and system monitoring software, the system can ensure the energy storage system operates autonomously without attention of staff

Household energy storage

PV energy storage battery system of proper size can be used for households. In the day time, it can meet the power demands of domestic electrical appliances by means of solar power generation, and excessive power can be stored in the accumulating battery for the use at night, or it can be fed back to the power grid to earn the tariff. At night, the battery system discharge power. By reasonably avoiding the peak time for power use when tariff is high, the dependency of households on municipal power can be reduced effectively. In addition, the PV energy storage battery system can also work as the household backup power supply in case of failure of municipal power supply.

CATL-solution


The battery system is adopted together with the on-grid and off-grid integral inverter to accurately track maximum power point of the PV battery in real time and obtain maximum PV energy output. With unique control techniques, optimally rational distribution of PV energy between multiple uses such as “direct supply to load”, “storage in the battery system”, “fed back to the power grid”, etc. can be achieved.

The household energy storage UPS contains an intelligent charging and discharging management module. It support the charging modes of power grid AC and solar PV (PV) DC and can be used as the backup power supply for household or to provide uninterruptible power supply to critical industrial equipment, network server, road lighting, etc.

Advantages of lithium battery energy storage system + Integral PV inverter:

High energy density of the battery system; high safety performance and long circulation life Modular design of battery product adopted to facilitate installation, commissioning and maintenance Quick plug-in designed adopted to quickly install the battery module and the cabinet Battery monitoring system capable of monitoring and controlling the parameters and status in real time Self-cooling method adopted to guarantee extremely low noise of the entire systemUnique control pattern adopted to realize optimally rational distribution of energy

Advantages of UPS solution:

High efficiency, reliability and intelligence; long-time backup power supply Intelligent automatic switching to realize unattended operation Humanized alarm functions to provide complete on-line protection WI-FI communication and wireless control adopted to realize remote operation Indoor LCD wireless controller with powerful functionsAccessible to Internet; capable of being checked and controlled via computer and cell phone

Communication base station

In previous practices, lead-acid batteries were usually used in back-up power supplies of communication base stations. However, lead-acid batteries have many disadvantages such as low energy density, short service life and severe environmental pollution, which can be well solved by introduction of lithium batteries into the communication application field. Comparing with lead-acid batteries, lithium batteries have larger power/capacity, longer service life, smaller weight and are pollution free and have greater environmental compatibility.

CATL-solution


When municipal power supply (AC) is normal, the rectifier has outputs and operates normally under the load, and the battery bank is in the floating charging and standby state. When municipal power supply is cut off, the rectifier has not outputs and the battery bank discharges power to ensure the rectifier works normally under the load till municipal power is restored or power of the battery bank is used up. After municipal power supply is restored, the rectifier has outputs and operates normally under the load, and the battery bank charges for future use.

Characteristic and advantages of the product solution

High consistency of battery cell High energy density of the battery system; high safety performance and long circulation life Modular design adopted to facilitate installation, commissioning and maintenance Intelligent designed adopted to realize telemetering, remote signaling and remote control as well as remote computer management Automatically adjusting the charging and discharging currents depending on ambient temperature