Battery resistance is the battery at work, the current flow through the battery internal resistance, generally divided into AC internal resistance and DC resistance, because the rechargeable battery internal resistance is very small, measured DC resistance due to electrode capacity polarization , Resulting in polarized internal resistance, it can not be measured its true value, and measured its internal resistance can be exempted from the impact of polarization resistance, the true value.
AC internal resistance test method is: the use of the battery equivalent to the characteristics of an active resistor to the battery a 1000HZ, 50mA constant current, the voltage sampling rectifier filter and a series of processing to accurately measure its resistance.
If the rate of the complex reaction is lower than the rate of the decomposition reaction, the resulting gas is too low to be consumed, resulting in an increase in the internal pressure of the battery.
Specific steps: the battery 1C charging constant current constant voltage charged to 4.2V, cut-off current 10mA, and then placed in the air pressure of 11.6Kpa, the temperature (20 +3) low pressure box storage for 6 hours, the battery will not explode, Fire, crack, leak.
In all environmental factors, the temperature has the greatest impact on the charge and discharge performance of the battery. The electrochemical reaction at the electrode / electrolyte interface is related to the ambient temperature. The electrode / electrolyte interface is regarded as the heart of the cell. If the temperature drops, the reaction rate of the electrode also decreases, assuming that the battery voltage remains constant, the discharge current decreases, the battery power output will drop. If the temperature rise is the opposite, that is, the battery output power will rise, the temperature also affects the transmission speed of the electrolyte is accelerated, the transmission temperature decreases, transmission slows down, the battery charge and discharge performance will be affected. But the temperature is too high, more than 45, will destroy the chemical balance within the battery, leading to side effects
Contact: Cindy Huang
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