Analysis of Causes of Failure Classification and Failure of Lithium Battery

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - ซัพพลายเออร์สถานีพลังงานแบบพกพา

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. خارجي عنصر جن ۾ اثر، ايڪوپنڪچر، سنکنرن، تيز گرمي پد جي ٻرڻ، انساني ناڪامي، وغيره شامل آهن.

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. يا چڪرن جو تعداد 1000 ڀيرا پهچي وڃي، خارج ٿيڻ جي گنجائش شروعاتي گنجائش جي 80٪ کان گهٽ نه هجڻ گهرجي.

جيڪڏهن گنجائش ۾ معياري چڪر ۾ تيز گهٽتائي آهي، ته اها گنجائش جي گهٽتائي جي ناڪامي سان تعلق رکي ٿي. بيٽري جي گنجائش گھٽائڻ جي ناڪامي جو سبب مواد جي ناڪامي آهي، ۽ اهو بيٽري جي پيداوار جي عمل، بيٽري جي استعمال جهڙن مقصدي عنصرن سان ويجهڙائي سان لاڳاپيل آهي. 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. گنجائش.

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. اليڪٽرولائيٽ ۾ موجود ٽريس واٽر تي رد عمل ڪندي HF پيدا ڪرڻ پڻ آسان آهي، جنهن جي نتيجي ۾ بيٽري اندر زنگ لڳندو آهي. هوا بند ٿيڻ سٺو ناهي جيڪو اليڪٽرولائيٽ جي خرابي، اليڪٽرولائيٽ جي ويسڪوسيٽي ۽ رنگينيت جو سبب بڻجي ٿو، ۽ آخرڪار ٽرانسميشن آئن جي ڪارڪردگي ۾ تيز گهٽتائي جو سبب بڻجي ٿو.

ڪليڪٽر جي ناڪامي: اجتماعي سيال جي سنکنرن، ڪليڪٽر جي ڪنسنٽريشن گهٽجي وئي. مٿي ڏنل اليڪٽرولائيٽ جي ڪري HF، جيڪو ختم ٿي ويندو آهي، ڪليڪٽر جي سنکنرن جو سبب بڻجندو آهي، هڪ خراب چالکائي پيدا ڪندو آهي، جنهن جي نتيجي ۾ اومڪ رابطي ۾ اضافو ٿيندو آهي يا فعال مواد جي ناڪامي ٿيندي آهي. چارج ۽ ڊسچارج جي عمل دوران، ڪيو ورق گهٽ صلاحيت هيٺ ڦهلجي ويندو آهي، مثبت مٿاڇري ۾ جمع ٿيندو آهي، جنهن کي ٽامي سڏيو ويندو آهي.

اجتماعي ناڪامين جون عام صورتون فعال مادو کي جمع ۽ فعال مواد جي وچ ۾ ڇلڻ لاءِ ڪافي نه آهن، ۽ بيٽري لاءِ گنجائش فراهم نه ٿيون ڪري سگهن. 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.

بيٽري جي استعمال جو ماحول: ماحول جو گرمي پد تمام گهڻو / گهٽ آهي، اوور چارج، هاءِ ميگنيفڪيشن چارج ۽ ڊسچارج، پيداوار جو عمل ۽ بيٽري ڊيزائن جي جوڙجڪ، وغيره. 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.

نجاست شارٽ سرڪٽ جو سبب بڻجندي آهي: مثبت اليڪٽرروڊ سلري ۾ ڌاتو جي نجاست جي منتقلي ڊايافرام کي سوراخ ڪرڻ جو سبب بڻجي سگهي ٿي يا منفي اليڪٽرروڊ ليٿيم ڊيليگرا کي اندروني شارٽ سرڪٽ جو سبب بڻائي سگهي ٿي. 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.

بيٽري اوور شوٽ ۽ اوور هينگ جي انڊڪشن دوران، شارٽ سرڪٽ پڻ ٿيندو. 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.