What are the common faults and causes of lithium batteries?

Side reactions (electrolyte analysis; impurity in the positive electrode; water); leakage of the customer's circuit board (referring to the battery returned by the customer after production); the customer failed to spot welding (the battery after the customer produced); burr; micro Short circuit; dendrites appear on the negative electrode. 2. The reasons for the failure of over-thickness are as follows: welding seam leakage; electrolyte analysis; undried moisture; poor cap sealing; too thick shell wall; too thick shell; too thick core (too much material attached; The pole pieces are not compacted; the diaphragm is too thick). 3. Abnormal battery formation (SEI film is incomplete and dense); baking temperature is too high → binder aging → stripping; negative electrode specific capacity is low; positive electrode material is too much and negative electrode material is small; cap leaks, Weld leakage; electrolyte analysis shows that the conductivity is reduced. 4. Reasons for the low battery capacity: the amount of material attached is small; the amount of material attached to both sides of the pole piece is quite different; the electrolyte is small; the electrolyte conductivity is low; the diaphragm porosity is small; the core is too thick (not dried or electrolyte Non-permeation) There is no electricity during the volume division; the positive and negative materials have a small specific capacity. 5. Battery short-circuit material dust; broken casing when loading; ruler scraped (diaphragm paper is too small or not well-pad); uneven winding; not packaged; diaphragm has holes; 6. high internal resistance of the battery: the negative electrode and Welding of the pole ear; virtual welding of the positive electrode sheet and the pole ear; virtual welding of the positive electrode ear and the cap; virtual welding of the negative electrode ear and the shell; large internal resistance in contact between the rivet and the pressure plate; the positive electrode is not added with a conductive agent; Short circuit; the porosity of the diaphragm paper is small. 7. The battery is disconnected. The pole lugs and rivets are not welded well, or the effective solder joint area is small; the connecting piece is broken (the connecting piece is too short or the welding is too low when spot welding with the pole piece) 8. The battery explosion divider cabinet is faulty (causing overcharge) ; Diaphragm closure effect is poor; internal short circuit. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.