Detailed reason for the failure of lithium battery

Аўтар: Iflowpower - Cyflenwr Gorsaf Bŵer Cludadwy

1 Lithium ion battery failure classification In order to prevent the above-mentioned performance attenuation and battery safety issues, the failure decomposition of lithium-ion batteries is bound to. The failure of the lithium-ion battery refers to the failure and safety failure of the battery performance attenuated by certain essential properties or abnormal use of performance. 2 The original lithium ion battery failure can be divided into endome and 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. 3 Common failure performance of lithium ion batteries and its failure mechanism decomposition capacity attenuation failure: When the standard circulation 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 electrolytic liquid and the deterioration, the fluid corrosion, the system trace impurities, 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. It is also easy to form HF with trace reactions in the electrolyte, resulting in corrosion inside the battery.

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. Internal resistance increase: The lithium ion battery internal resistance conference accompanied by energy density, voltage and power decrease, battery heat and other failure problems.

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. Internal short circuit: internal short circuit tends to 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.

D&39;Gasaufnahme vun der elektrolytescher Léisung am Prozess vun der Batterie ännert am Prozess vun der Batteriebildung ass normal Gas, awer den Iwwergangsverbrauch Elektrolyt-Verëffentlechungsgas oder positiv Elektrodenmaterial Verëffentlechung Sauerstoff ass anormal. 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. D&39;thermesch aussergewéinlech thermesch ausser Kontroll bedeit datt d&39;Temperatur vun der Lithium-Ionbatterie lokal oder allgemeng Temperaturerhéijung ass, an d&39;Hëtzt kann net an der Zäit verspreet ginn, an eng grouss Quantitéit accumuléiert dobannen an induzéieren weider Nebenwirkungen.

Faktoren, déi duerch Hëtztverloscht vu Lithium-Ion-Batterien induzéiert sinn, sinn anormal Operatiounsbedingungen, dat heescht Mëssbrauch, Kuerzschluss, héich Vergréisserung, héich Temperatur, Quetschen an Akupunktur. Analyse vu Lithium an der negativer Uewerfläch vun der Batterie ass e gemeinsame Lithium-Ion Batterie Alterungsfehler Phänomen. Analyse vu Lithium reduzéiert den internen aktive Lithium-Ion an der Batterie, et gëtt Kapazitéitfehler, an d&39;dendritesch Punktur kann zu engem lokalen Stroum an Hëtzt féieren, a schliisslech e Batteriesécherheetsproblem verursaachen.