Block diagram of a typical battery

Block diagram of typical battery

Block diagram of a typical battery

Figure  shows a simplified block diagram of a typical battery pack. It consists of the main battery cell and an equivalent series resistance (ESR). The internal impedance of a battery is dependent on the specific battery’s size, chemical properties, age, temperature and the discharge current. Hence, the voltage measured at the terminals of the battery is the sum of the voltage drop across the ESR and the battery cell voltage. Given the sensitivity of this Li-ion and Li-polymer batteries, battery packs are required to include protection circuitry to prevent runaway events. These safety electronics ensure that the cell is not exposed to over-/under-voltage and/or over-current situations.