Classification and characteristics of conventional energy storage batteries

1. The classification and characteristics of batteries From the chart, it can be seen that there are many types of batteries, and lead-acid batteries and lithium batteries are widely used at this stage; therefore, this article will focus on introducing these two batteries. Lead-acid batteries and lead-carbon batteries Lead-acid batteries are chemical energy storage devices that use lead and lead dioxide as the negative and positive active materials of the battery, and dilute sulfuric acid as the electrolyte. The lead-carbon battery is a capacitive lead-acid battery, which is a technology evolved from the traditional lead-acid battery. It adds activated carbon to the negative electrode of the lead-acid battery, which can significantly increase the life of the lead-acid battery. 2. Lithium batteries. Lithium batteries use lithium metal or lithium alloy as the negative electrode material and use non-aqueous electrolyte solutions. They have many advantages such as high energy, long service life and light weight. They are widely used in hydraulic, thermal, wind and solar power stations. Wait for energy storage power system. Mainly include: lithium iron phosphate (LFP) battery, ternary lithium battery (NCM/NCA) battery, lithium cobalt oxide (LCO) battery, and other lithium batteries, such as lithium manganate, lithium titanate, etc. Potassium iron phosphate lithium cobalt oxide ternary In addition, in addition to the difference in performance due to different battery cell materials, the type of battery cell process will also be significantly different. Note: The above picture is from the network. The main performance parameters of the battery are 48V lithium battery. Parameters (Pineng US2000) ① Ah (ampere hour): an indicator reflecting the size of the battery, for example, 48V 100Ah means the battery capacity is 4.8 kWh. Xiaogu interpretation: Nominal voltage and nominal ampere-hours are the most basic and core concepts of batteries. Electricity Whu003dPower W*hour hu003dVoltage V*Amp-hour Ah② C (Battery discharge rate C): reflects the battery charge-discharge capacity rate; charge-discharge rateu003dcharge-discharge current/rated capacity. ③ DOD (Depth of Discharge): refers to the percentage of the discharged capacity of the battery to the rated capacity of the battery during the use of the battery. The relationship between DOD and the number of battery cycles ④ SOC (State of charge) State of charge, which represents the percentage of the battery's remaining power to the battery's rated capacity. ⑤ SOH (State of Health) battery health status (including capacity, power, internal resistance, etc.) is the ratio of the capacity discharged by the battery from the fully charged state at a certain rate to the cut-off voltage and its corresponding nominal capacity. ⑥ Three-stage Three-stage generally refers to a device that charges in three stages. Three-stage charging is an automatic charging process. Constant current, constant voltage and floating charge are the three necessary stages of three-stage charging. The charge and discharge strategy of lead-acid batteries is three-stage: ⑦ BMS (Battery Management System) battery management system for battery status monitoring, battery balance management, battery safety, and data communication. ⑧BMU (Battery Management Unit) battery module energy management system battery module energy management system multiple battery management systems. BYD B-BOX⑧ EMS (Energy Management System) energy management system EMS is mainly used for internal energy control of the microgrid, maintaining the power balance of the microgrid for normal operation; meeting the on-site energy dispatching requirements of small and medium-sized commercial energy storage systems; meeting large-scale energy storage The system will involve dispatching on the grid side. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Why is BMS the core competitiveness of the power battery PACK factory?