A summary of the causes of abnormal lithium batteries, including lithium battery capacity, lithium battery internal resistance, lithium battery voltage, the size of thick, open circuit, the battery of all a simple summary and share for everyone, these anomalies in the production process will often encounter, Welcome friends add ~
Common failures and causes of lithium batteries are as follows:
1, low battery capacity
Produced because: a. With less than the amount of material attached; b. Pole pieces on both sides with a larger amount of material attached; c. Piece rupture; d. Electrolyte less; e. Electrolyte conductivity is low; f. Is not equipped with a good; g diaphragm small porosity; h aging of the adhesive material attached off; i core ultra thick (not drying or electrolyte does not penetrate) j. Partial capacitance is not fully charged; k positive and negative Material specific capacity is small.
2, high battery resistance
Produce the reason: a. Negative pole piece and the tab are welded together; b. Positive pole piece and the tab are welded together; c. The positive pole ear and the cap joint weld; d. ; F. Positive without conductive agent; g electrolyte no lithium salt; h short-circuit the battery once; i separator paper porosity is small.
3, the battery voltage is low
cause:
a. Side reactions (electrolyte decomposition; positive impurities; water); b. Not well formed (SEI film does not form a safety); c. Customer's circuit board leakage Customer does not require spot welding (customer processing batteries); e burr f micro-short circuit g negative dendrite. 4, super-thick produce thick for the following reasons:
a. Weld leaks; b. Electrolyte decomposition; c. Unwetted moisture; d. Poor sealing of the cap; e. Shell wall too thick; f. Shell too thick; g. Core too thick ; Pole piece is not compacted; diaphragm is too thick).
5, the battery into abnormal
b. baking temperature is too high → adhesive aging → de-baling; c. low specific capacity of negative electrode; d. Cap leakage, weld leaks f. Electrolyte decomposition, conductivity reduction.
6, battery explosion
a. There is a fault in the sub-cabinet (resulting in overcharge); b. The diaphragm has poor closing effect; c. Internal short circuit.
7, the battery short circuit
a. Dust; b. shell fashion break; c. Scraping (paper is too small or not pad good); d. winding missing;
8, the battery open circuit.
a) the ears and rivets are not welded well, or the effective spot area is small;
b) fracture of the connecting piece (the connecting piece is too short or the welding is too under the spot welding)