Summary of causes of failure of lithium-ion battery protection board

The fault judgment of the lithium-ion battery protection board summarizes the reasons for the abnormality of the lithium-ion battery, including the capacity of the lithium-ion battery, the internal resistance of the lithium-ion battery, the voltage of the lithium-ion battery, the ultra-thick size, the circuit break, etc., which are summarized and shared by the battery funds. 1. Low battery capacity a. Less addition; B. Large difference in the number of materials on both sides of the pole piece; C. The pole plate is broken; d. Less electrolyte; E. The electrolyte has low conductivity; F. Anode and cathode plates Mismatch; G. Diaphragm porosity is small; H. Adhesive aging → adhesion and shedding; 1. Ultra-thick core (not dry, impermeable to electrolyte) K. Anode and cathode materials are smaller than the capacity. 2. High battery internal resistance a. Virtual welding of negative plate and electrode ear; B. Virtual welding of positive plate and electrode ear; C. Virtual welding of positive lug and cap; D. Virtual welding of negative lug and shell E. The internal resistance of the rivet and the pressure plate is high; F. The positive electrode does not add conductive agent; G. The electrolyte does not contain lithium; H. The battery is short-circuited; 1. The diaphragm paper has small pores. 3. Reasons for low battery power: A. Side reactions (decomposition of electrolyte; impurities in the positive electrode; water); B. Poor molding (SEI film is not safe); C. Customer circuit board leakage (refers to the battery returned after processing by the customer) ); D. The customer did not spot welding as required (customer processing unit); e. Burr; F. Micro short circuit; G. Dendrites in the negative electrode. 4. Super thick A: Leakage of the weld seam; b. Electrolyte decomposition; c. Undried moisture; D. Poor sealing of the bottle cap; e. The shell wall is too thick; F. The shell is too thick; G. The roller core is too thick ( Too much additive; the pole piece is not compacted; the separator is too thick. 5. Abnormal battery formation A. Poor molding (SEI film is incomplete and dense); B. Baking temperature is too high → bonding aging → peeling; C. The negative electrode is lower than the capacity; D. The positive electrode is more, the negative electrode is less; E. The cover and the weld are leaked; F. The electrolyte is decomposed, and the conductivity is reduced. 6. The battery explodes a. B. Diaphragm sealing effect is poor; C. Internal short circuit. 7. Battery short circuit A: Dust; b. Shell fashion; C. Ruler scraping (diaphragm paper is too small or the pad is not good); d. Release; E. Improper packaging; F There are holes in the diaphragm; g. Burrs 8. The battery breaks A) The lugs and rivets are not well welded, or the effective solder joint area is small; B) The lap is broken (the lap is too short or too close to the rod during spot welding) Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: What is the difference between a power lithium battery and an ordinary battery?