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Important factors affecting internal resistance of battery

source:Industry News release time:2022-11-11 Hits:0     Popular:Lithium-ion battery wholesale

  

  (1) Service time of the battery: with the increase of the service time, the battery capacity decreases and the internal resistance of the battery increases due to electrolyte loss, corrosion of the electrode plate and the connecting strip, vulcanization of the electrode plate, deformation of the electrode plate, reduction of active substances and other factors

  (2) Battery charging: As the electrolyte goes deep into the battery, the thickness of electrode surface material and the porosity of electrode surface are different. Different batteries have great internal resistance and charge

  (3) Temperature: when the ambient temperature changes, such as increasing, the diffusion of reaction materials will be accelerated, the charge transfer, electrode dynamic process and material transfer will be simpler, and the internal resistance of the battery will be reduced. If not, add

  (4) Battery type: different manufacturers, different types and different types of batteries have different internal resistance due to different formulations of electrode, electrolyte and diaphragm materials, different battery structures and different assembly processes

  (5) Signal frequency measurement: At present, many battery internal resistance measurements actually measure battery impedance, including capacitive reactance. The magnitude of the capacitive reactance and the frequency of the measured signal make the measurement of the internal resistance of the battery not objective. For the sake of objectivity, the signal based measurement current and voltage should be connected with the analysis method to remove the battery capacitance measurement results, so the measurement results are independent of the measurement signal frequency, that is, at any measurement signal frequency

  (6) There is a unique resistance measurement result in measuring and measuring current economy: for large current measurement, the time for measuring signal and closing measuring signal is increased. Because the establishment and stability of polarization is a changing process, different current, different measurement time and different polarization make the measurement result of internal resistance of battery not objective. In order to be objective, the internal resistance should be measured with small signal current as far as possible. According to the experiment, the measured current is less than or equal to 0.05c10 (where C10 is the capacity of the battery at the 10 hour discharge rate)


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