Common problems analysis of lithium-ion battery

A summary of common faults of lithium-ion battery includes capacity of lithium-ion battery, internal resistance of battery, voltage, super thick size, open circuit and so on. These happen frequently during production.

Lithium-ion battery common faults and causes are as follows:

1, the battery capacity is low

Causes: a. attached shoes less; B. both sides sheet attached shoes is large; C. pole piece fracture; D. less electrolyte; E. the electrolyte conductivity is low; F. the positive and negative with one piece good; G. diaphragm porosity; H. adhesive aging - Fu Liao fall off; I. (core ultra-thick (not drying or electrolyte osmotic) j. points when capacity is not full of electricity; K. anode materials are given.

2, the battery internal resistance is high

Causes: a. the cathode with ear virtual welding; B. the positive plate and ear virtual welding; C. the positive ear and blocks virtual welding; D. virtual cathode ear with shell welding; E. rivet and clamp large contact resistance; F. the anode without conductive agent; G. electrolyte lithium salt; H. battery has short circuit; I. the diaphragm paper porosity is small.

3, low battery voltage

The reason:

A. the adverse event (electrolyte decomposition; The anode impurities; There is water); B. not to turn into good (SEI film did not form safety); C. customer circuit board leakage (after processing refers to the client back to the batteries); D. the customer failure to spot welding (client processing after the batteries); E. burr; F. micro short circuit; G. the cathode dendrite.

4, ultra-thick: reason is as following:

A. weld leakage; B. the electrolyte decomposition; C. not water drying; D. blocks sealing poor; E. The wall is too thick; F. shell too thick; G. core winding is too thick (Fu Liao too much; Pole piece not compaction; The diaphragm is too thick).

5, battery into abnormalities

A. not to turn into good (SEI film incomplete, dense); B. the baking temperature is too high - adhesive aging - stripping; C. the cathode low specific capacity; D. the positive Fu Liao outnumbered negative Fu Liao; E. flat blocks, weld leakage; F. the electrolyte decomposition, the conductivity decreased.

6, battery explosion

A. let ark defective (cause overcharge); B. the diaphragm closure effect is poor; C. internal short circuit.

7, battery short circuit

A. dust; B. packing fashion; C. feet scraping (diaphragm paper is too small or not good mat); D. winding not neat. E. no wrap; F. diaphragm with a hole; G. burr

8, battery open circuit.

a) the lead and rivet are not well welded, or the effective spot area is small;

b) connection strap is broken. (the strap is too short, or the welding position is too low while welding with pole piece)

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