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Analysis of Causes of Failure Classification and Failure of Lithium Battery

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Pārnēsājamas spēkstacijas piegādātājs

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. بهرني عوامل لکه اغیز، اکوپنکچر، زنګ وهل، د تودوخې لوړه احتراق، د انسان ناکامي، او نور.

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. یا د سایکلونو شمیر ۱۰۰۰ ځله ته رسیږي، د خارجیدو ظرفیت باید د لومړني ظرفیت له ۸۰٪ څخه کم نه وي.

که چیرې ظرفیت په معیاري دوره کې تیز کمښت ولري، نو دا د ظرفیت کمولو ناکامۍ پورې اړه لري. د بیټرۍ د ظرفیت د کمولو د ناکامۍ ریښه د موادو ناکامي ده، او دا د بیټرۍ د تولید پروسې، د بیټرۍ کارولو په څیر د هدفي فکتورونو سره نږدې تړاو لري. 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. وړتیا.

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. دا هم اسانه ده چې په الکترولیت کې د اوبو د ټریس سره تعامل وشي ترڅو HF تولید شي، چې په پایله کې د بیټرۍ دننه زنګ راځي. د هوا بندښت ښه نه دی چې د الکترولیت خرابیدو، د الکترولیت د واسکاسیټي او کرومیټیت لامل شي، او په نهایت کې د لیږد ایون فعالیت کې د تیز کمښت لامل شي.

د راټولونکي ناکامي: د مایعاتو ډله ایز زنګ وهل، د راټولونکي غلظت کم شو. هغه HF چې د پورته الیکټرولایټ لخوا کم شوی وي، د راټولونکي د زنګ وهلو لامل کیږي، ضعیف چالکتیا رامینځته کوي، چې په پایله کې د اومیک تماس یا فعال موادو ناکامي کې زیاتوالی راځي. د چارج او خارجیدو پروسې په جریان کې، د Cu ورق د ټیټ ظرفیت لاندې منحل کیږي، په مثبت سطح کې زیرمه کیږي، کوم چې د مسو په نوم یادیږي.

د ډله ییزو ناکامیو عام ډولونه کافي ندي چې فعال ماده د راټولیدو او فعال موادو ترمنځ د ټوټې کیدو لامل شي، او د بیټرۍ لپاره ظرفیت نشي چمتو کولی. 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.

د بیټرۍ کارولو چاپیریال: د محیطي تودوخې درجه ډیره لوړه / ټیټه ده، ډیر چارج، لوړ میګنیفیکیشن چارج او خارجیدل، د تولید پروسه او د بیټرۍ ډیزاین جوړښت، او داسې نور. 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.

ناپاکي د لنډ سرکټ لامل کیږي: د مثبت الکترود سلیري کې د فلزي ناپاکۍ لیږد کولی شي د ډایفرام سوري کولو لامل شي یا منفي الکترود لیتیم ډیلیګرا ته وده ورکړي ترڅو داخلي لنډ سرکټ رامینځته کړي. 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.

د بیټرۍ د اوور شوټ او اوور هینګ د انډکشن په جریان کې، شارټ سرکټ به هم وي. 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.

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