Lithium cobalt oxide battery technology questioned -Lithium - Ion Battery Equipment
Following the fatal traffic accident of Uber's self-driving test vehicle due to the failure of its 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.(Lithium - Ion Battery Equipment)
He also said that because the manufacturing process is not yet fully mature, the yield rate of 21700-type batteries of Panasonic and Samsung SDI will be lower than that of 18650-type batteries, while Model 3 has insufficient capacity due to battery module assembly problems, or it is related to this.
Tesla crashes again
The Tesla in the accident first crashed into the barrier in the middle of the highway, then into the second lane on the far left, and after being hit by a Mazda in that lane, it ended up driving in the far left lane with an Audi. There was a collision involving three vehicles. According to the local traffic police patrol, the Model X involved quickly caught fire before being struck by two other vehicles.
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.
According to the data, Tesla is currently the only car company that uses 18650 type cobalt oxide lithium-ion batteries. The above-mentioned battery is 18mm in diameter and 65mm in length, and is often used as a battery cell for notebook computers. Since lithium-ion batteries are approaching the power threshold at this stage, Tesla has been using thousands of batteries to form a battery array and place it on the bottom of the car as the power for its electric vehicles. However, such a design increases the possibility of the battery array being hit when the vehicle collides, which in turn causes the cells or modules to be easily displaced, resulting in the disconnection and short-circuit of the wires used in parallel and series, resulting in a fire.
In addition, in order to reduce weight and cost, the outermost insulating layer of the 18650 battery array of ModelS and ModelX is also cancelled. Although the company claims that it has excellent battery management system, battery grouping technology, and timely temperature monitoring system technology, the frequent accidents show that the natural defects of the 18650 battery array are still difficult to overcome.
In this regard, Tesla suggested that a large amount of water should be used to put out the fire after the battery catches fire, and that a thermal imaging camera is still required to monitor the condition of the battery within an hour after the battery is completely cooled.
The stability of lithium cobalt oxide batteries is questioned
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.
When it comes to Model 3, he said that at present, the yield rate of 18650 batteries of Panasonic and Samsung SDI is generally above 98%, but after switching to 21700 (battery array used by Model 3), since the manufacturing process is not yet fully mature, the yield rate will be affected. The recently revealed Model 3 capacity shortage may be related to this.
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.(Lithium - Ion Battery Equipment)
He also said that because the manufacturing process is not yet fully mature, the yield rate of 21700-type batteries of Panasonic and Samsung SDI will be lower than that of 18650-type batteries, while Model 3 has insufficient capacity due to battery module assembly problems, or it is related to this.
Tesla crashes again
The Tesla in the accident first crashed into the barrier in the middle of the highway, then into the second lane on the far left, and after being hit by a Mazda in that lane, it ended up driving in the far left lane with an Audi. There was a collision involving three vehicles. According to the local traffic police patrol, the Model X involved quickly caught fire before being struck by two other vehicles.
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.
According to the data, Tesla is currently the only car company that uses 18650 type cobalt oxide lithium-ion batteries. The above-mentioned battery is 18mm in diameter and 65mm in length, and is often used as a battery cell for notebook computers. Since lithium-ion batteries are approaching the power threshold at this stage, Tesla has been using thousands of batteries to form a battery array and place it on the bottom of the car as the power for its electric vehicles. However, such a design increases the possibility of the battery array being hit when the vehicle collides, which in turn causes the cells or modules to be easily displaced, resulting in the disconnection and short-circuit of the wires used in parallel and series, resulting in a fire.
In addition, in order to reduce weight and cost, the outermost insulating layer of the 18650 battery array of ModelS and ModelX is also cancelled. Although the company claims that it has excellent battery management system, battery grouping technology, and timely temperature monitoring system technology, the frequent accidents show that the natural defects of the 18650 battery array are still difficult to overcome.
In this regard, Tesla suggested that a large amount of water should be used to put out the fire after the battery catches fire, and that a thermal imaging camera is still required to monitor the condition of the battery within an hour after the battery is completely cooled.
The stability of lithium cobalt oxide batteries is questioned
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.
When it comes to Model 3, he said that at present, the yield rate of 18650 batteries of Panasonic and Samsung SDI is generally above 98%, but after switching to 21700 (battery array used by Model 3), since the manufacturing process is not yet fully mature, the yield rate will be affected. The recently revealed Model 3 capacity shortage may be related to this.
