What is the internal resistance of a normal battery? How to measure it?

What is the internal resistance of the battery? How to measure it? The internal resistance of the battery is the point where the battery is working. The current passes through the internal resistance of the battery. It is generally divided into the internal resistance of the communication and the DC resistance. The internal resistance of the rechargeable battery is very small, because when the measured DC The resistance capacity electrode polarization, polarization resistance, is actually value, so it can not be measured by measuring the internal resistance of communication to avoid the influence of polarization resistance, which is within the true value. The test method of the internal resistance of communication is as follows: using the characteristics of the battery, it is equivalent to an active resistance, a 1000hz, 50ma constant current battery, a series of treatments such as voltage sampling, rectification and filtering, and then the resistance value is accurately measured. What is the internal pressure of the battery and what is the normal internal pressure? The internal pressure of the battery is caused by the pressure of the gas during charging and discharging. It is mainly affected by application process factors such as battery data manufacturing process and structure. Under normal circumstances, the battery pressure is maintained at a normal level, such as overcharge or overdischarge, the battery pressure may increase. If the rate of the composite echo is lower than the rate of the differentiated echo, the offensive gas is too late to be consumed, and a pressure rise will be formed in the battery. What is the internal pressure test? Lithium battery internal pressure test: (UL specification) simulates the battery at an altitude of 15,240 meters (low pressure 11.6kPa), test whether the battery is leaking or drum-shaped. Specific steps: Charge the battery with 1C constant current and normal pressure to 4.2v, cut-off current 10mA, store in a low-pressure box, pressure 11.6kpa, temperature (20+_3), and store for 6 hours. The battery will not burst, catch fire, tear or leak. How does the ambient temperature affect the battery function? Among all the environmental factors, temperature has the greatest influence on the battery's charging and discharging functions. The electrochemical response of the electrode/electrolyte interface as the core of the battery is related to the ambient temperature. If the temperature decreases, the electrode response rate will also decrease. Assuming that the battery voltage remains unchanged and the discharge current decreases, the battery output power will also decrease. If the temperature rise is opposite, that is, the battery output power will rise, and the temperature will also affect the transmission speed of the electrolyte. The temperature rise speed increases, the transmission temperature decreases, the transmission speed slows down, and the battery charging and discharging function will also be affected. But the temperature is too high, exceeding 45 degrees, it will destroy the chemical balance of the battery, leading to side-use. What are the control methods for overcharging? In order to prevent the battery from overcharging, the charging terminal should be controlled. When the battery is full, some special information can be used to determine whether the charging is over. There are usually six methods to prevent battery overcharging: 1. Peak voltage control: Determine the end of charge time by detecting the peak voltage of the battery; 2. DT/DT control: Determine the end of charge time by detecting the peak temperature change rate of the battery; 3. .T control: When the battery is charging, the difference between the temperature and the ambient temperature reaches the maximum; 4.-v control: When the battery overflows to the peak voltage, the voltage drops a certain value; 5. On-time control: set a certain charging time to control charging After the end, generally set the charging capacity to 130% of the nominal capacity required for the control time; 6. TCO control: Due to the safety and characteristics of the battery, high temperature (outside the high temperature battery) charging should be prevented, when the battery temperature rises by 60 ℃ Charging should be stopped. What is overcharging and how does it affect the battery function? Overcharging refers to the behavior of continuously charging the battery after the charging process is fully charged. Due to design reasons, the negative capacitance is greater than the positive capacitance. Therefore, the positive electric attack of the gas passing through the gap paper and the negative electric attack of the cadmium composite material. The reason is that under normal circumstances, the internal pressure of the battery will not rise significantly, but if the charging current is too large, or the charging time is too long, the attack is too late to consume oxygen, causing internal pressure to rise, battery deformation, leakage, and other undesirable phenomena . At the same time, its electrical function will be greatly reduced. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.