Analysis of Causes of Failure Classification and Failure of Lithium Battery

Аўтар: Iflowpower - Cyflenwr Gorsaf Bŵer Cludadwy

The protocol can be divided into internal or external causes. The internal principle is the physical and chemical variation of the invalidation, the research scale can be traced back to the thermodynamics of the atomic, molecular scale, and the research failure process. Extern Faktoren abegraff Impakt, Akupunktur, Korrosioun, Héichtemperaturverbrennung, mënschlecht Versoen, asw.

1. When the capacity attenuation failure standard cycle life detection, the number of cycles reaches 500 times when the discharge capacity should not be less than 90% of the initial capacity. Oder d&39;Zuel vun den Zyklen erreecht 1000 Mol, d&39;Entladungskapazitéit sollt net ënner 80% vun der initialer Kapazitéit sinn.

Wann d&39;Kapazitéit e schaarfe Réckgang am Standardzyklus huet, gehéiert et zum Kapazitéitsdämpfungsfehler. D&39;Wurzel vum Batteriekapazitéit Dämpfungsfehler ass den Echec vum Material, an et ass enk verbonne mat den objektive Faktoren wéi Batterie Fabrikatiounsprozess, Batterieverbrauch. From the perspective of material, the fact that the fails to fail, the structural failure of the positive electrode material, the transition growth of the negative surface SEI, the electrolyte analysis and deterioration, the fluid corrosion, the system trace, etc.

The structural failure of the positive electrode material: the structural failure of the positive electrode material includes cathode material particles, irreversible transformation, material dissemination, etc. LIMN2O4 will cause distortion to the Jahn-Teller effect during the charge and discharge process, and even particle rupture, resulting in electrical contact between particles. LiMn1.

5Ni0.5O4 material The four-square crystal system in the charge and discharge process, LiCoO2 material caused CO into the Li layer due to the transition of Li, caused the layered structure, restricting the layered structure during charge and discharge. Kapazitéit.

The negative electrode material failure: the failure of the graphite electrode occurs in the surface of the graphite, the graphite surface is reacted with the electrolytic solution, and the solid electrolyte interface phase (SEI) is machined. If excessive growth can cause the lithium ion content in the internal system, the result is caused by capacity attenuation. The failure of silicon negative electrode materials is the cycle performance problem caused by its huge volume expansion.

Electrolyte failure: LIPF6 stability is poor, easy to analyze to reduce the migration of Li + content in electrolyte. Et ass och einfach op d&39;Spuerwaasser am Elektrolyt ze reagéieren fir HF ze generéieren, wat zu Korrosioun an der Batterie resultéiert. D&39;Loftdichtheet ass net gutt fir d&39;Verschlechterung vun der Elektrolyt, d&39;Viskositéit an d&39;Chromatizitéit vum Elektrolyt ze verursaachen, a schlussendlech zu engem scharfen Réckgang vun der Iwwerdroungion Leeschtung.

Den Ausfall vum Sammler: kollektiv Flëssegkeetskorrosioun, d&39;Konzentratioun vum Sammler ass erofgaang. Den HF, deen duerch den uewe genannten Elektrolyt verschwonnen ass, verursaacht Korrosioun vum Sammler, generéiert eng schlecht Konduktivitéit, wat zu enger Erhéijung vum ohmesche Kontakt oder aktive Materialausfall resultéiert. Wärend dem Laden- an Entladungsprozess gëtt d&39;Cu-Folie ënner nidderegem Potenzial opgeléist, an der positiver Uewerfläch deposéiert, wat de sougenannte Kupfer ass.

Gemeinsam Forme vu kollektive Feeler sinn net genuch fir d&39;aktiv Substanz tëscht der Agglomeratioun an dem aktive Material ze peelen, a kënnen d&39;Kapazitéit fir d&39;Batterie net liwweren. 2. Increase the internal resistance of the lithium-ion battery accompanying the decrease in energy density, voltage and power drop, battery heat and other failure issues.

Metal factors leading to increased lithium-ion battery internal resistance are divided into battery-key materials and batteries. Battery Key Material: The microcrack and rupture of the positive electrode material, the damage of the negative electrode material is too thick, the electrolytic solution aging, the active material is detached from the current, and the contact of the active material and the conductive additive is worse (including the loss of conductive additives). Diaphragm, blockage, battery extreme ear welding abnormalities, etc.

Batterie Notzung Ëmfeld: Ëmfeld Temperatur ass ze héich / niddereg, overcharge, héich-Vergréisserung charge an Offlossquantitéit, Fabrikatioun Prozess an Batterie Design Struktur, etc. 3. Internal short circuits often cause self-discharge, capacity attenuation, local thermal out of control, and cause safety accidents.

Short-circuit between copper / aluminum concentration: battery processing or metal foreign body puncture diaphragm or electrode, battery pack in the battery package, causes positive, negative set fluid contact. The short circuit caused by the diaphragm failure, the diaphragm, diaphragm, diaphragm corrosion, etc. can result in failure of the diaphragm, the failure diaphragm loss of electron insulation or gap is positive, negative electrode micro contact, then the local fever is severe, continuous charge and discharge will be spread to four weeks , Cause heat loss.

Onreinheet verursaacht Kuerzschluss: Iwwergangsmetall Gëftstoffer an der positiver Elektrodeschlümmung kënnen zu engem Duerchbrochblend resultéieren oder negativ Elektroden Lithium Delegra förderen fir intern Kuerzschluss ze verursaachen. Short-circuit caused by lithium dendrites: a lithium lactary crystal, dendritic crystal pass through diaphragm, during the long cycle. Battery design, manufacturing or battery pack assembly, design is unreasonable or local pressure will also cause internal short circuits.

Wärend der Induktioun vun der Batterie Iwwerschlag an Iwwerhang gëtt et och Kuerzschluss. 4. The gas intake of the electrolyte in the process of consuming the electrolyte in the process of battery formation, forming the gas intake of the SEI film is normal, but the transitional consumption electrolyte release gas or positive electrode material interpretation of oxygen is abnormal.

Often out in this soft bag battery, it will cause excessive pressure in the battery, and stroke the encapsulation aluminum membrane, internal battery contact problem, etc.