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How to measure the internal resistance of a battery
2022-03-15
Internal resistance is an important technical indicator of the performance of a battery.
The internal resistance is different for different types. Batteries of the same type have different internal resistances due to inconsistent internal chemistry. The internal resistance of a battery is very small and we generally define it in terms of milliohms.
I. Internal resistance is not a fixed value
When the battery is in a different state of charge, its internal resistance value is different;
When the battery is in a different state of life, its internal resistance value is also different.
From the technical point of view, we generally divide the internal resistance of the battery into two states: the internal resistance of the charging state and the internal resistance of the discharging state.
The internal resistance of the charging state is the internal resistance of the lithium battery measured after the battery is fully charged.
The internal resistance in the discharged state refers to the internal resistance of a lithium battery measured after the battery has been completely discharged (discharged to the standard cut-off voltage).
Under normal circumstances, the internal resistance in the discharged state is unstable, and the measurement result is much higher than the normal value, while the internal resistance in the charged state is relatively stable, and the measurement of this value has practical comparative significance. Therefore, in the measurement process of the battery, we all take the internal resistance of the charging state as the measurement standard.
II, internal resistance can not be accurately measured by general methods
The internal resistance of a battery is very small and we generally define it in micro-ohms or milliohms. In general measurement occasions, we require that the measurement accuracy error of the internal resistance of the battery must be controlled within plus or minus 5%. To be accurate, this must be measured with special instruments.
The internal resistance is different for different types. Batteries of the same type have different internal resistances due to inconsistent internal chemistry. The internal resistance of a battery is very small and we generally define it in terms of milliohms.
I. Internal resistance is not a fixed value
When the battery is in a different state of charge, its internal resistance value is different;
When the battery is in a different state of life, its internal resistance value is also different.
From the technical point of view, we generally divide the internal resistance of the battery into two states: the internal resistance of the charging state and the internal resistance of the discharging state.
The internal resistance of the charging state is the internal resistance of the lithium battery measured after the battery is fully charged.
The internal resistance in the discharged state refers to the internal resistance of a lithium battery measured after the battery has been completely discharged (discharged to the standard cut-off voltage).
Under normal circumstances, the internal resistance in the discharged state is unstable, and the measurement result is much higher than the normal value, while the internal resistance in the charged state is relatively stable, and the measurement of this value has practical comparative significance. Therefore, in the measurement process of the battery, we all take the internal resistance of the charging state as the measurement standard.
II, internal resistance can not be accurately measured by general methods
The internal resistance of a battery is very small and we generally define it in micro-ohms or milliohms. In general measurement occasions, we require that the measurement accuracy error of the internal resistance of the battery must be controlled within plus or minus 5%. To be accurate, this must be measured with special instruments.
