Analysis of the cause of lithium battery failure

Lithium battery is a common item in our lives, and it is also prone to some minor faults, such as: low battery capacity, high battery internal resistance, ultra-thickness, abnormal battery formation, battery explosion, battery short circuit, battery open circuit, etc. , So, what are the reasons for these failures? Please follow the footsteps of the energy storage electric lithium battery manufacturers to discuss together. 1. Reasons for the low capacity of the lithium battery: the amount of material attached is too small; the amount of material attached on both sides of the pole piece is quite different; the pole piece is broken; the electrolyte is less; the electrolyte conductivity is low; the positive electrode and the negative electrode are not properly matched; the diaphragm porosity The rate is small; the adhesive is aging → the attached material falls off; the core is super thick, and there is no electricity when the volume is divided; the specific capacity of the positive and negative materials is small. 2. Reasons for the high internal resistance of the lithium battery: false welding of the negative electrode sheet and the lug; the false welding of the positive electrode sheet and the lug; the virtual welding of the positive electrode lug and the cap; the virtual welding of the negative electrode lug and the shell; the contact between the rivet and the pressure plate has a large internal resistance; Conductive agent; the electrolyte has no lithium salt; the battery has been short-circuited; the porosity of the diaphragm paper is small. 3. Reasons for the low voltage failure of lithium batteries: side reactions (electrolyte analysis; impurity in the positive electrode; water); not formed well (the S film is not formed safely); leakage of the customer's circuit board (refers to the battery sent back by the customer after production );. The customer did not spot welding as required (the cell after the customer produced it); burrs; micro-short circuit; dendrites in the negative electrode. 4. The cause of the over-thickness failure: air leakage in the welding seam; electrolyte analysis; undried moisture; poor sealing of the cap; too thick shell wall; too thick shell; too thick core (too much material attached; pole piece not compacted; The diaphragm is too thick). 5. Reasons for abnormal lithium battery formation: not formed well (S film is incomplete and dense); baking temperature is too high → binder aging → stripping; negative electrode specific capacity is low; lithium battery has more positive electrode material and less negative electrode material ; Air leakage in the cap, air leakage in the weld; electrolyte analysis, the conductivity is reduced. 6. Reasons for the explosion of the lithium battery: the sub-capacitor is faulty (causing overcharge); the diaphragm closing effect is poor; the 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 it. Previous: How will the power lithium-ion battery replaced by a new energy vehicle be scrapped?