Lithium cobalt oxide batteriteknologi stilles spørgsmålstegn ved
Following the fatal traffic accident of Uber's self-driving test car due to the failure of the self-driving system, a Tesla Model X in California, United States, exploded after a traffic accident. The owner of the car died of his injuries after being taken to the hospital.
Insiders told reporters that Tesla's good-looking data on performance and mileage can be said to be achieved on the premise of radical technology. He said that during the use of Tesla's 18650 battery, as long as there is a slight inconsistency in the battery array, a circulating current will form inside the battery pack, causing self-discharge and greatly increasing the loss of the battery.
Han sagde også, at fordi fremstillingsprocessen endnu ikke er helt moden, vil udbyttegraden for 21700-type batterier af Panasonic og Samsung SDI være lavere end for 18650-type batterier, mens Model 3 har utilstrækkelig kapacitet på grund af problemer med batterimodulsamling , eller det er relateret til dette.
Tesla styrter ned igen
Teslaen i ulykken ramte først bommen midt på motorvejen, ramte derefter anden vognbane yderst til venstre, og efter at være blevet ramt af en Mazda i den vognbane, endte den med at køre i den yderste venstre vognbane med en Audi. Der var et sammenstød med tre biler. Ifølge den lokale færdselspolitipatrulje brød den involverede Model X hurtigt i brand, inden den blev ramt af to andre køretøjer.
According to the reporter's understanding, the Model X was severely damaged after the incident, the front of the car was completely destroyed, and only the frame was burned. With so many of the car's batteries exposed after the accident, road crews couldn't immediately clear the debris from the road, so the CHP called in engineers from Tesla to evaluate the batteries.
Ifølge dataene er Tesla i øjeblikket det eneste bilfirma, der bruger 18650 type koboltoxid lithium-ion-batterier. Det ovennævnte- batteri er 18 mm i diameter og 65 mm i længden og bruges ofte som battericelle til bærbare computere. Da lithium-ion-batterier nærmer sig strømtærsklen på dette tidspunkt, har Tesla brugt tusindvis af batterier til at danne et batteri og placere det på bunden af bilen som strøm til sine elektriske køretøjer. Et sådant design øger imidlertid muligheden for, at batteriarrayet bliver ramt, når køretøjet kolliderer, hvilket igen forårsager, at cellerne eller modulerne let forskydes, hvilket resulterer i afbrydelse og kortslutning af ledningerne, der bruges parallelt. og serier, hvilket resulterer i en brand.
For at reducere vægt og omkostninger er det yderste isolerende lag af 18650 batterirækken af ModelS og ModelX også annulleret. Selvom virksomheden hævder, at den har fremragende batteristyringssystem, batterigrupperingsteknologi og rettidig temperaturovervågningssystemteknologi, viser de hyppige ulykker, at de naturlige defekter i 18650-batterisystemet stadig er vanskelige at overvinde.
I denne henseende foreslog Tesla, at der skulle bruges en stor mængde vand til at slukke ilden, efter at batteriet brænder, og at der stadig kræves et termisk kamera for at overvåge batteriets tilstand inden for en time efter, at batteriet er fuldstændigt. afkølet.
Der sættes spørgsmålstegn ved stabiliteten af lithium-koboltoxid-batterier
In fact, as early as April last year, a Model X caught fire and exploded after a collision accident in Guangzhou, causing serious damage to the vehicle. At that time, the owner questioned the quality of the Tesla Model X vehicle itself; at the beginning of this year, another Tesla spontaneously ignited because of the battery. So, why does the battery technology, which is Tesla's core competitiveness, have repeated accidents?
Industry insiders told reporters that Tesla's good-looking data on performance and mileage can be said to be obtained under the premise of radical technology. He said that although the consistency of Tesla's 18650 batteries was stable in the initial stage, during use, the battery array must have inconsistent battery attenuation. Any slight inconsistency can create circulating currents inside the battery pack, causing self-discharge and greatly increasing battery wear.
Når det kommer til Model 3, sagde han, at den nuværende udbyttegrad på 18650 celler fra Panasonic og Samsung SDI generelt er over 98 procent, men efter at have skiftet til 21700 (batteriarrangement brugt af Model 3), vil udbyttegraden blive påvirket, fordi fremstillingsprocessen er endnu ikke helt moden. Den nyligt afslørede Model 3-kapacitetsmangel kan være relateret til dette.
Previously, Tesla said the main production limiting factor for the Model 3 was battery module assembly. Musk said there were four "regions" in battery module production for the Model 3, one of which was particularly problematic. According to reports, a Tesla employee who had worked in the Gigafactory broke the news that as recently as mid-December last year, parts of Model 3 battery production were still done manually.
