How to Make Energy Storage Charging and Discharging Efficiency Efficient.

1、When everyone is concerned about the safety, environmental protection, lifespan, cost, and other issues of energy storage, it is found that the charging and discharging of energy storage is a bit "luxurious". For example, taking the grid connection point as the assessment point, when a lithium-ion battery is charged with 1 kilowatt hour of energy, the discharged electricity is only about 0.8 kilowatt hours. Even if one is wealthy, they must secretly gnash their teeth. Moreover, energy storage is a green and environmentally-friendly generalist who roams the world, Such low efficiency is a bit embarrassing.

2、When considering how to improve the charging and discharging efficiency of energy storage, we first understand the charging and discharging principles of energy storage systems. The battery cells are connected in series and parallel to form a battery cluster. Multiple battery clusters are connected in parallel to form a battery stack and connected to the DC side of the energy storage converter. The energy storage converter converts the DC voltage into AC voltage, which is then boosted by a transformer and connected to the power grid through a line. The loss of electrical energy during the charging and discharging process is nothing more than improving system conversion efficiency and reducing station power consumption loss.

3、According to the national standard "Lithium ion batteries for electric energy storage" (GBT 36276-2018), the initial charge and discharge energy efficiency of the battery cluster shall not be less than 92%. While meeting the standards, efforts should also be made to improve its efficiency by optimizing the operating environment temperature, cell consistency, battery management level, and other means to improve the overall level. And adopting new technologies, such as liquid cooled battery systems, has significant advantages in improving battery consistency and reducing station power consumption losses.

4、The losses of energy storage converters generally include conduction losses of power switching devices, switching losses, and output unit filtering inductance losses. Power switching devices generally use insulated gate bipolar transistor (IGBT) as switching devices. Currently, mainstream domestic manufacturers of energy storage converters are mainly divided into two-level and three-level bridge topologies based on the number of bridge arm levels. The three-level full bridge topology can reduce switching losses and filtering inductance losses, Improve the efficiency of energy storage converters.

5、Transformer losses mainly include no-load losses and load losses, among which no-load losses mainly include hysteresis losses and eddy current losses. Taking the 1250kVA transformers of SCB10 and SCB13 as examples, the no-load and load losses of SCB13 transformers are 1505 watts and 8720 watts, respectively, which can reduce losses by 13% compared to the SCB10 type. Selecting transformers with higher energy efficiency levels can effectively reduce transformer losses.

6、When the temperature difference between the inside and outside of the air-cooled battery compartment is large, the degree of heat exchange is relatively high, and the power consumption of the air conditioning is also large. In order to reduce the station power load, insulation measures are taken for the prefabricated compartment. Insulation materials with low thermal conductivity are used on the walls, top, and bottom of the prefabricated compartment. At the same time, considering that direct sunlight in summer can cause the temperature inside the compartment to rise, shading measures such as photovoltaic panels and ceilings can be set up on the top of the compartment, Reduce heat exchange inside and outside the prefabricated cabin. The batteries in the prefabricated energy storage battery compartment are generally arranged in a rack style, with battery modules stacked on the rack. When the environmental temperature inside the compartment is too high or too low, it can affect the charging and discharging performance of the energy storage battery, and even cause safety hazards. Industrial air conditioning is generally equipped in the battery compartment, and the air conditioning can be set at different temperatures according to the season. Generally, it is set in summer。

Shenzhen Topband Battery Co., Ltd.，established in 2006, is a wholly-owned subsidiary of Shenzhen Topband Co., Ltd. (002139.SZ). We focus on lithium iron phosphate batteries,with independent research and development in cells and BMS. With the ability to integrate the entire industry chain, we are committed to providing customers with one-stop lithium battery solutions and services. Our quality products are widely used in energy storage and light power.