1. Basic situation of energy storage battery
Energy storage batteries generally refer to lead-acid batteries used for energy storage in wind energy and solar energy installations, and are used in many occasions.
The capacity of the energy storage battery is the amount of stored electrical energy, which is also represented by A·h. According to the different electricity consumption environments, multiple batteries can be connected in series (or parallel). According to the ability of wind energy and solar energy conversion, and the energy demand of electrical equipment, determine the capacity of the matching battery.
Independent wind energy and solar energy systems pay too much attention to the conversion devices of solar energy and wind energy. In fact, this is a misunderstanding in understanding. The bottleneck restricting the development of independent solar and wind energy systems is the storage battery in the energy storage part. The energy storage battery is still the most important and the key part in determining the cost of use.
At present, there is no one of the most suitable wind and solar energy storage batteries, and lead-acid batteries are still used more. The price of metal lead is related to the application cost of energy storage lead-acid batteries. Therefore, the life of the energy storage battery is very important. Calculated with a 12 V 100 A·h battery, assuming one charge-discharge cycle per day, the battery can store up to 1.2 kW·h of electricity per day. If it works for 300 days in a year, the electric energy used is only 360 kW·h. According to the current electricity price, it is only about 150 yuan. At present, the price of a 100 A·h ordinary battery is more than 400 yuan. According to this calculation, the electric energy used is enough for the cost of the battery for 3 years, not to mention the investment in other parts of the entire system. Therefore, this requires lead-acid batteries to have a longer life.
Wind energy, solar energy storage battery charging status, energy from natural conversion, can not be completely controlled, although there is a controller, but the quality of the status directly affects the charging. Therefore, wind energy and solar energy storage batteries have one more uncontrollable factor than other batteries. It is this factor that is terrible for batteries. In fact, charging acceptance is an important parameter of lead-acid batteries, and it is more important for energy storage batteries. Generally, the power of solar panels or fans is limited and cannot be very large. The battery must store the limited energy in the battery, which depends on the acceptance performance of the battery. More importantly, the charge acceptance and life of lead-acid batteries are related. Poor charge acceptance will directly affect the life of the battery.
Wind energy and solar energy storage batteries require a wide range of adaptability with temperature changes. If the battery is installed outdoors, it may be exposed to high temperatures in summer, and if it is placed in a simple iron box and exposed to direct sunlight, the internal temperature may reach 60~80 °C. Such a high temperature cannot be tolerated by ordinary batteries. If it is a valve-regulated battery, it cannot withstand such a temperature. May fail soon. In the cold winter in the north, the minimum temperature can reach below 20 ℃. At such a low temperature, the charging and discharging efficiency will be very low, and problems are prone to occur. Batteries are subject to changes in temperature and harsh climatic conditions, although one can demand that appropriate measures be taken. The battery must have low temperature performance, resistance to long-term power loss or deep discharge, and resistance to high temperature overcharge.
2. Indicators of energy storage battery
The performance indicators of energy storage batteries include 10h rate capacity, low temperature capacity, 120h rate capacity, capacity consistency, sealing performance, charge acceptance, charge retention, water loss, and cycle durability.
3. Model name of energy storage battery
For example, 6-CN F-100, in the model, the first digit represents the number of single cells connected in series, “6” means 6 cells, and the rated voltage is 12V; “CN” stands for energy storage battery; “F” stands for valve-controlled type; the last number stands for 10h rate capacity.