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Characteristics and Selection of the Lithium Battery for Solar

Sep 08 , 2022

1. What are the characteristics of solar batteries lithium?


From the perspective of application scenarios, solar batteries lithium are mainly used in electric vehicles, electric bicycles and other power tools.


The energy storage lithium battery is mainly used in the fields of solar energy storage lithium battery, peak regulation and frequency regulation power auxiliary efficiency, renewable energy grid connection and micro grid. Due to different application scenarios, the performance requirements of solar batteries lithium are also different.


First of all, as a mobile power source, solar batteries lithium have the highest requirements for volume (and mass) energy density under the premise of safety, in order to achieve more durable battery life.


At the same time, users also hope that electric vehicles can be safely and quickly charged, so solar batteries lithium have high requirements for energy density and power density, but due to safety considerations, energy-based batteries with a charge and discharge capacity of about 1C are generally used.


Most energy storage installations do not need to be moved, so energy storage lithium batteries have no direct requirements for energy density. As for power density, different energy storage scenarios have different requirements.


For power peak regulation, off-grid photovoltaic energy storage or user-side peak-valley price difference energy storage scenarios, it is generally required that solar batteries lithium be continuously charged or discharged for more than two hours, so capacity-type batteries with a charge-discharge rate of ≤0.5C are suitable. .


Regarding the energy storage scenarios of power frequency regulation or smoothing the fluctuation of renewable energy, the energy storage battery needs to be quickly charged and discharged in the time period of seconds to minutes, so it is suitable for the application of ≥2C power batteries;


In some application scenarios that require both frequency regulation and peak regulation, energy-based solar batteries lithium are more suitable. Of course, power-based and capacity-based batteries can also be used together in this scenario.


2. How to choose a solar lithium battery for solar?


Solar lithium battery street lights are the main facilities for road lighting in villages. The equipment is simple and does not require a lot of wiring. By converting light energy into electrical energy, and electrical energy into light energy, it brings a piece of brightness to the night. During this period, it can be recharged. The discharged battery plays a key role.


Compared with the lead-acid batteries or gel batteries of the past, the solar batteries lithium that are commonly used now are better than the power, and are easier to achieve fast charging and deep discharge, and have a longer life.


Therefore, it also brings us a better user experience, but there are differences in the quality of lithium batteries. Let's start with its packaging form to see what characteristics these lithium batteries have, and which one is better. Packaging There are three types of cylindrical winding, square stacked and square winding.


In short, the lithium battery for solar is a cylindrical battery (cylindrical winding type), which generally uses a steel shell, and also has an aluminum shell. The technology is relatively mature, small size, flexible in groups, low cost, mature in technology, and good in consistency; after grouping, the heat dissipation is not well planned, the weight is heavy, and the specific energy is low.


For square batteries (square wound type), most of the steel shells are in the early stage, and most of them are aluminum shells now. Good heat dissipation, simple design in groups, good reliability, high safety, including explosion-proof valves, high hardness; high cost, many types, and difficult to unify the technological level of solar batteries lithium, which is one of the mainstream technical paths.