Difference between power battery and energy storage battery

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The main differences between power batteries and energy storage batteries are: different battery capacity, different application scenarios, differences in battery management system BMS, different types of cells used, different performance and design, and so on.

Power battery, mainly for driving tools, rotating motors to provide power, the main use in electric vehicles, electric trains, electric logistics vehicles, electric two-wheeled vehicles, three-wheeled vehicles, four-wheeled vehicles, golf carts, electric handling and loading trucks, electric boats, unmanned power tools, such as drones, lawnmowers, electric toy cars, unmanned electric handling vehicles.

Energy storage batteries, mainly used in solar power generation equipment and wind power generation equipment for power stations, home energy storage, portable power supply, etc., and renewable energy saving energy with storage batteries.

Power batteries are limited by the size and weight of the car, startup acceleration, and occasionally for climbing mountains to provide high current, so there are higher standards of performance requirements than storage batteries, pay more attention to the charging and discharging power, etc., the requirements of fast charging rate, high output power and shock resistance, especially high safety and high energy density, to achieve a long-lasting range as well as lightweight requirements in terms of weight and volume.

The energy storage battery unit does not need to be moved, and the power and density are required differently in different energy storage scenarios. Weight and volume are generally not too high. The preparation of energy storage batteries emphasizes battery capacity, especially operational stability and service life. Consistency of the battery module is given more consideration.

Different emphasis on battery performance, different performance and design. Energy storage batteries mainly store electrical energy and do not fluctuate as much as power batteries when supplying power to the outside world. Energy storage batteries can be considered a more stable output, generally small discharge current and long discharge time.

Energy storage batteries can be used in power peaking, off-grid photovoltaic energy storage or user-side peak-valley spread energy storage scenarios, which generally require continuous charging or continuous discharging of the storage battery for more than two hours, so it is suitable to use the capacity-type batteries with a charging and discharging multiplication rate of ≤ 0.5C; for the power FM or smoothing of fluctuations in renewable energy energy storage scenarios, it requires fast charging and discharging of the storage battery in the second-minute interval, so it is suitable for the application of the ≥ 2C power type battery application.

Compared with the power lithium batteries, lithium batteries for energy storage have higher requirements for service life. The life of new energy vehicles is generally about 8 years, while the life of energy storage projects are generally expected to be more than 10 years. The cycle life of lithium power battery is about 2000 times, while the cycle life of lithium energy storage battery is generally required to be greater than 2000 times.

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The Difference Between the Energy Storage Principle of Solar Battery and Lithium Battery

💡Most of today’s smart electronic products use rechargeable batteries lithium. Especially for mobile electronic devices, due to the characteristics of lightness, portability and multiple application functions, users are not limited by environmental conditions during use, and the operation time is long. Therefore, batteries lithium are still the most common choice despite their weakness in battery life.

💡Although solar battery and batteries lithium sound like the same kind of products, they are actually not the same. There are still the most essential differences between the two.

To put it simply, a solar battery is a power generation device, which itself cannot directly store solar energy, while a lithium battery is a type of storage battery that can continuously store electricity for users to use.

1️⃣ The working principle of solar battery (can not do without sunlight)
Compared with batteries lithium, one disadvantage of solar battery is obvious, that is, they cannot be separated from sunlight, and the conversion of solar energy into electricity is synchronized with sunlight in real time.

Therefore, for solar battery, only during the day or even sunny days is their home field, but solar battery cannot be used flexibly as long as they are fully charged like batteries lithium.

2️⃣ Difficulties in “Slimming” of solar battery
Because the solar battery itself cannot store electrical energy, it is a very big bug for practical applications, so the developers have an idea to use the solar battery in combination with the super-capacity battery, and the battery is one of the most widely used solar power supply systems. Class large-capacity solar battery.

The combination of the two products makes the solar battery that are not small in size become more “big”. If they want to be applied to mobile devices, they must first go through the process of “thinning”.

Because the power conversion rate is not high, the solar battery’s sunshine area is generally large, which is the biggest technical difficulty faced by its “slim down”.

The current limit of solar energy conversion rate is about 24%. Compared with the production of expensive solar panels, unless the solar energy storage is used in a large area, the practicality will be greatly reduced, not to mention the use of mobile devices.

3️⃣ How to “thin” solar battery?
Combining solar energy storage batteries with recyclable batteries lithium is one of the current research directions of researchers, and it is also a useful way to mobilize solar battery

The most common solar battery portable product is the power bank. Solar energy storage converts light energy into electrical energy and stores it in the built-in lithium battery. The solar mobile power supply can charge mobile phones, digital cameras, tablet computers and other products, which is both energy-saving and environmentally friendly.