With the gradual maturation of lithium battery technology, people according to the differences in battery application scenarios, the lithium batteries on the market are mainly divided into two categories: power battery and energy storage battery. So what are power battery and energy storage battery respectively? What are the differences in their application areas?

PW-164 Industrial and commercial Energy Storage Cabinet Self-Cooling

1. What is a power battery?

Power battery refers to a large electrical capacity and output power, power battery that is the power source for the tool to provide power source of power, mostly used in two-wheeled series of cars, three-wheeled series of cars, golf carts, high and low voltage forklifts, robots type, etc., to provide power to the lithium battery. The power source of the new energy vehicles on the market at present is generally also mainly based on power batteries.

2. What is the energy storage battery

Energy storage battery is a kind of battery that can convert chemical energy into electrical energy and store it. Energy storage batteries are commonly used in household energy storage, solar and wind power generation equipment power stations, portable power supply, communication base stations, and lithium battery packs used for renewable energy saving energy, as well as storage batteries used for renewable energy saving energy. With the popularization of solar power, wind power, etc., many families and base stations are used on the energy storage battery for electricity storage and use.

3. The difference between power batteries and energy storage batteries

3.1 Different battery cells:

Currently on the market both commonly used batteries are based on lithium batteries, they have the same place there are differences, in the consideration of economy and security, the mainstream battery type of storage batteries most of the lithium iron phosphate, most of the power batteries are lithium iron phosphate and ternary lithium, and with the lithium iron phosphate battery energy density issues, the future market, lithium iron phosphate batteries will dominate the proportion.

3.2 Energy density is different:

We mentioned earlier that the power battery is used to provide power lithium batteries, high requirements for battery energy. The power battery is subject to automobile volume, weight limitations and startup acceleration and other factors, can not be equipped with a large weight, so the energy density of the battery has become an important factor in distinguishing between the power battery and most of the energy storage batteries. The energy density of power battery is high, and it is more suitable for the requirements of power battery usage scenarios to realize large energy with small volume.

3.3 Different cycle life:

Commonly used power batteries on the market, ternary lithium battery life is generally about 1200 times of charge and discharge cycles, lithium iron phosphate battery is about 3000 times, according to three days of complete charge and discharge a frequency of use, lithium battery life of ten years; energy storage batteries compared to the power battery charging and discharging more frequently, in the same 10 years of life under the premise of the cycle life has a higher demand for lithium battery energy storage The cycle life of lithium battery for energy storage requires 3500–5000 charge/discharge cycles.

3.4 Battery cost institutions are different:

In the energy storage battery system, the cost of the energy storage battery pack accounts for 60%, the cost of the battery inverter accounts for 20%, the energy management system (EMS) accounted for 10%, the battery management system (BMS) accounted for 5%, if it is a household, may require photovoltaic panels to build the off-grid system and so on. And power battery only battery cell costs accounted for up to 80%, the remaining 20% are battery management system, structural components, auxiliary materials, and so on.

3.5 the different areas of application

Application areas are different, the beginning of the article has also been mentioned, and now says on the other hand, power batteries on the market are often the need for customization, there is no clear fixed parameters, can be changed according to customer demand, because of the different scenarios for the use of the battery voltage, capacity, peak current, size, series and parallel, communication methods, etc., there are different needs to meet the need for product development, therefore, there is a need for Lithium battery customization services; and energy storage battery is not quite the same, commonly used application scenarios, home energy storage, basically the market can find their own corresponding products, with inverters, off-grid systems, photovoltaic panels and other components, to meet user needs, of course, energy storage, in some special scenarios can also be customized, only relatively speaking, there will be less.

Home Energy Storage System

Summary

These are the insights of Chinese lithium battery manufacturer brand LYBATT on the difference between energy storage batteries as well as power batteries. For lithium-ion batteries for energy storage, most of the energy storage devices do not need to be mobile, so lithium batteries for energy storage do not have a direct requirement for energy density. For power density, different energy storage scenarios have different requirements. It is used for user-side power peaking, off-grid photovoltaic energy storage or peak-to-valley energy storage scenarios. To summarize, there are some differences between power batteries and energy storage batteries in terms of battery structure, chemical reaction, performance indicators and application areas. Power batteries are mainly used to provide power for electric vehicles, focusing on power density and charging/discharging rate; energy storage batteries are mainly used to store electrical energy and release it when needed, focusing on energy density and capacity.