Method for detecting internal states of lithium ion batteries and nondestructively screening lithium ion batteries
A lithium-ion battery, internal state technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, electricity measurement, etc., can solve the problems of being mixed into the normal battery use stage, insufficient liquid injection, hidden safety hazards, etc., to reduce production costs, Improved production efficiency and high accuracy
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Embodiment 1
[0020] An energy-type lithium-ion power battery with lithium iron phosphate as the positive electrode material system controls the stable room temperature conditions to charge the battery.
[0021] Observing its formation curve, we found the following abnormal curves: Abnormal 1: The constant voltage charging time is 3-5 minutes longer than the normal battery, because even the constant voltage charging time of the normal battery will fluctuate, considering a certain range, 3 Minutes is an obvious cut-off point, and during the constant voltage charging process, the current signal is abnormal, and dI / dt appears positive, as shown in the attached figure 1 shown. A large number of dead zones and a small amount of lithium precipitation appear on the surface of the negative electrode of this battery.
[0022] Abnormality 2: The constant voltage signal is abnormal during the constant current charging process. Since 3.4V is an obvious characteristic point in the constant current char...
Embodiment 2
[0027] A power type lithium-ion power battery with lithium iron phosphate as the positive electrode material system, controlled and stable room temperature conditions to charge the battery.
[0028] Observe its formation curve and find the following abnormal curve:
[0029] Abnormality 6: The constant voltage charging time is more than 5 minutes longer than the normal battery. During the constant voltage charging process, the current signal is abnormal, and dI / dt appears positive. figure 1 shown. There are two situations in the internal state of this battery: one is that there is a large area of dead area on the surface of the negative electrode, and there is a slight lithium precipitation; the other is that the liquid injection volume is about 5% lower.
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