Teknologi bateri litium kobalt oksida dipersoalkan
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.
Beliau juga berkata kerana proses pembuatan belum matang sepenuhnya, kadar hasil bateri 21700 jenis Panasonic dan Samsung SDI akan lebih rendah berbanding bateri jenis 18650, manakala Model 3 mempunyai kapasiti yang tidak mencukupi disebabkan masalah pemasangan modul bateri. , atau ia berkaitan dengan ini.
Tesla ranap lagi
Tesla dalam kemalangan itu mula-mula melanggar penghadang di tengah-tengah lebuh raya, kemudian melanggar lorong kedua di sebelah kiri, dan selepas dilanggar oleh Mazda di lorong itu, ia akhirnya memandu di lorong paling kiri dengan Audi. Berlaku perlanggaran melibatkan tiga kenderaan. Menurut peronda polis trafik tempatan, Model X terbabit pantas terbakar sebelum dirempuh dua kenderaan lain.
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.
Menurut data, Tesla pada masa ini merupakan satu-satunya syarikat kereta yang menggunakan bateri ion litium-kobalt oksida jenis 18650. Bateri-yang disebutkan di atas ialah diameter 18mm dan panjang 65mm, dan selalunya digunakan sebagai sel bateri untuk komputer notebook. Memandangkan bateri lithium-ion menghampiri ambang kuasa pada peringkat ini, Tesla telah menggunakan beribu-ribu bateri untuk membentuk susunan bateri dan meletakkannya di bahagian bawah kereta sebagai kuasa untuk kenderaan elektriknya. Walau bagaimanapun, reka bentuk sedemikian meningkatkan kemungkinan tatasusunan bateri dilanggar apabila kenderaan berlanggar, yang seterusnya menyebabkan sel atau modul mudah dialihkan, mengakibatkan pemotongan dan litar pintas-wayar yang digunakan secara selari dan siri, mengakibatkan kebakaran.
Di samping itu, untuk mengurangkan berat dan kos, lapisan penebat paling luar bagi susunan bateri 18650 ModelS dan ModelX juga dibatalkan. Walaupun syarikat itu mendakwa bahawa ia mempunyai sistem pengurusan bateri yang sangat baik, teknologi pengelompokan bateri, dan teknologi sistem pemantauan suhu yang tepat pada masanya, kemalangan yang kerap menunjukkan bahawa kecacatan semula jadi pada susunan bateri 18650 masih sukar untuk diatasi.
Dalam hal ini, Tesla mencadangkan bahawa sejumlah besar air harus digunakan untuk memadamkan kebakaran selepas bateri terbakar, dan kamera pengimejan haba masih diperlukan untuk memantau keadaan bateri dalam masa sejam selepas bateri sepenuhnya. disejukkan.
Kestabilan bateri litium kobalt oksida dipersoalkan
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.
Mengenai Model 3, beliau berkata bahawa kadar hasil semasa 18650 sel Panasonic dan Samsung SDI secara amnya melebihi 98 peratus, tetapi selepas bertukar kepada 21700 (tatasusunan bateri yang digunakan oleh Model 3), kadar hasil akan terjejas kerana proses pembuatan masih belum matang sepenuhnya. Kekurangan kapasiti Model 3 yang didedahkan baru-baru ini mungkin berkaitan dengan ini.
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.
