BLDC TOOL TERMINAL BATTERY VOLTAGE FULL

Capacity retention at different temperaturesД«attery management is part of power measurement. A Li-ion battery has a self-discharge of 1~2% per month, Nickel-based has 10~15% per month.ДЇigure 4. The self-discharge rate is typically doubled with every 10вЊ increase. However, poor manufacturing practices and improper handling may increase this effect.

Self-discharge is basically not a manufacturing defect but a battery characteristic. The self-discharge of all battery chemistries increases at higher temperature.

BLDC TOOL TERMINAL BATTERY VOLTAGE FULL

Usually, the full charged capacity reduce 10%~20% after 500 cycles.ДЇigure 3. When the accumulated discharge capacity is equal to design capacity, the Cycle Count increases. ItвЂ™s estimated by the discharge capacity and design capacity. The Cycle Count is a reference number of how many charging/discharging cycles a battery has experienced as aging. Normally, the bigger the C-rate, the smaller the available capacity. The available capacity changes per different C-rates. For example, when discharging with 1C, the battery will be fully discharged in 1 hour ideally. The C-Rate is the expression of Charging / Discharging Current which is normalized with battery capacity. The voltage is not fixed and will be charged according to different loads, temperatures, aging effects or user requirements.ДЄ battery is considered fully discharged when battery voltage is equal to or less than Mini Discharging Voltage. Usually, the Mini Discharging Voltage represents the voltage of SOC equal to 0%. The Mini Discharging Voltage could also be defined as terminal voltage. The charging curve of a typical lithium battery When the battery voltage is equal to Max Charge Voltage and charging current is less than C/10, the battery is considered fully charged.ДЇigure 2. The diagram below shows the charging curve of a typical lithium battery. The condition may change according to different battery characteristics The battery is considered fully charged when the difference between battery voltage and charging voltage is within 100mV and charging current is less than C/10. It could be different if the anode/cathode material changes Typically, the Charging Voltages of a lithium-ion battery are 4.2V and 4.35V.

The Max Charging Voltage is decided by the chemistry component and characteristic of the battery. Capacity at different C-Rates and temperatures Lower temperatures result in lower output capacity.ДЇigure 1. The higher C-rate loading will have lower output capacity. The following diagram is an example of Voltage vs. A fully charged new battery will have 100% ASOC, but a fully charged aging battery could be less than 100% because of different charge/discharge conditions. The ASOC is a reference calculated by Design Capacity which is a fixed capacity from when the battery is manufactured. Typically, the range of RSOC is from 0% to 100%, a fully charged batteryвЂ™s RSOC is always 100% and a fully discharged battery has 0% RSOC. Because the available energy change depends on different charging/discharging currents, temperatures and aging effects, the SOC could be defined more clearly as ASOC (Absolute State-Of-Charge) and RSOC (Relative State-Of-Charge). SOC is defined as the status of available energy in the battery and usually expressed as percentages.

Bldc tool terminal battery voltage