801752 lipo battery.New breakthroughs in thermal instability research: BAK Battery deeply explores high-nickel 811

Recently, Dr. Lin Jian, Director of the Battery Research Institute of Shenzhen BAK Power Battery Co., Ltd., shared topics related to lithium battery safety and released BAK's latest research progress in the field of thermal instability, which once again confirmed the role of BAK batteries as The only domestic battery supplier whose complete vehicle has passed the thermal instability test pursues higher quality of high-nickel 811 battery cells

Recently, Dr. Lin Jian, Director of the Battery Research Institute of Shenzhen BAK Power Battery Co., Ltd., shared topics related to lithium battery safety and released BAK's latest research progress in the field of thermal instability, which once again confirmed the role of BAK batteries as The only domestic battery supplier whose entire vehicle has passed the thermal instability test pursues higher quality of high-nickel 811 battery cells.

In recent years, with the development of the new energy vehicle market, range anxiety has become more and more obvious in the development of the industry. With the advantages of higher energy density and lower cobalt content, high-nickel 811 also satisfies the market's demand for increased battery life and increased battery life. The dual requirements of reducing costs have become a trending choice to solve mileage anxiety. However, the environmental adaptability of high-nickel material systems determines that when the nickel content of the battery core increases, its cycle life and stability will be affected. As the first company in China to achieve mass production of high-nickel 811 cylindrical batteries, BAK has always focused on improving the safety performance of lithium batteries and has reached the forefront of the industry in controlling thermal instability issues.

In the development and production of high-nickel 811 batteries, BAK batteries adopt a specific chemical system design and a unique structural design to reduce the risk factor from the perspective of the overall structure, including structural design, top safety valve, positive and negative electrode materials, production The quality of battery cells is strictly controlled in all aspects including processes.

Safe and stable structural design is the basis for ensuring the thermal stability of the battery core. BAK's high-nickel 811 battery core adopts a symmetrical structure with even pressure relief and a safety valve to avoid thermal instability, ensuring that the battery can be recharged in time under extreme overheating and abuse. Effective heat release. Even if a safety problem occurs in the entire vehicle and any single cell in the battery module experiences thermal instability, the battery pack or module can still continue to work. You can also use BAK's "one core, one code" intelligent traceability system to find the battery as soon as possible. Relevant problem sources, production batches and other information can help trace and solve problems.

Dr. Lin Jian, director of the BAK Battery Cell Research Institute, said: "We have also conducted in-depth research on single crystal high-nickel products. Through various optimizations, we have better cycle performance than high-nickel secondary particles. At the same time, single-crystal batteries It can also overheat and become unstable.”

According to Dr. Lin Jian, in addition to safe and stable structural design, electrolyte additives can also effectively improve the thermal instability behavior of high-nickel cylindrical batteries. BAK Battery has a dedicated electrolyte R&D team with in-depth knowledge of various additives. Research and have applied these results to high-capacity high-nickel and silicon alloy battery systems to achieve double insurance of safety and efficiency.

In 2018, BAK's 18650-3.0Ah battery passed JAC Volkswagen's new energy vehicle test certification. The test standard is higher than the national standard. JAC IEV7S equipped with this battery passed the thermal instability test. BAK's battery is the only complete vehicle in China that has passed the test so far. Battery supplier for thermal instability testing. On the basis of the 18650-3.0Ah battery cell, the BAK 21700-5.0Ah battery cell has achieved a new breakthrough in performance. After 2000 cycles, the capacity is still greater than 80%, and it has passed more than 500 times with a 100% pass rate. Thermal instability module verification. The excellent performance of the two batteries in thermal instability verifies the ultra-high safety of BAK batteries. Currently, BAK is also continuing to conduct research on the thermal instability problem of high-nickel battery cells, and will continue to achieve breakthroughs in the safety performance of battery cells in the future.