Factors affecting the price of lithium batteries
1. Selection of batteries
First, the selection of batteries with different material systems will affect the price of the entire lithium battery. Lithium batteries have lithium manganese oxide (3.6V), lithium cobalt oxide (3.7V/3.8V), lithium nickel cobalt manganese oxide (commonly known as ternary, 3.6V), and lithium iron phosphate (3.2V) depending on the cathode material. , Lithium titanate (2.3V/2.4V) and other battery cells with different material systems, their voltage platform, safety factor, cycle times, energy density ratio, working temperature, etc. are different.
Second, the prices of batteries of different brands will also vary greatly. The price differences of batteries of the same material system but of different brands will also be very large, and the quality of batteries of various brands (safety, consistent Sex, stability) is basically proportional to the price.
2. Requirements and design of lithium battery PCM
PCM design can be divided into: basic protection, communication, BMS
Basic protection: basic protection includes overcharge, overdischarge, overcurrent and short circuit protection, and over temperature protection can be added according to product requirements
Communication: The communication protocol can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc., as well as a simple power display, which can be indicated by a power meter and LED.
BMS: BMS is the first letter abbreviation combination of BATTERYMANAGEMENTSYSTEM, called the battery management system, commonly known as battery nanny or battery housekeeper, mainly for the intelligent management and maintenance of each battery unit, to prevent the battery from overcharging and overdischarging. Extend battery life and monitor battery status. Its main functions include: real-time monitoring of battery physical parameters; battery state estimation; online diagnosis and early warning; charge, discharge and precharge control; balance management and thermal management, etc. The secondary system is mostly used in electric vehicle batteries.