Tags: What is the internal resistance of the battery? Internal resistance, also known as internal resistance, is a physical quantity and a term for a battery. It is similar in nature to resistance. In physics, it represents the size of the conductor's blocking effect on current. The internal resistance of the battery refers to the resistance experienced by the current flowing through the battery when the battery is working. The internal resistance of the battery refers to the electrode material, electrolyte, diaphragm resistance and the contact resistance of each part. It is related to the size, structure, and assembly of the battery. There are single cells and some multi-cell batteries, such as lead The internal resistance of acid batteries is very different between them. The internal resistance of the battery is not constant, and it changes with time during the charge and discharge process. This is because the composition of the active material, the concentration of the electrolyte and the temperature are constantly changing. The ohmic internal resistance obeys Ohm's law, and the polarization internal resistance increases with the increase of the current density, but it is not a linear relationship. It often increases linearly as the logarithm of the current density increases. Different types of batteries have different internal resistances. The same type of battery has different internal resistance due to the inconsistency of internal chemical characteristics. The internal resistance of the battery is very small, we generally use the unit of milliohm to define it. Internal resistance is an important technical indicator to measure battery performance. Under normal circumstances, a battery with a small internal resistance has a strong high-current discharge capacity, and a battery with a large internal resistance has a weak discharge capacity.