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03. The algorithm of using ternary batteries as rulers is of utmost importance

NIO has also taken certain measures to address these issues.

In order to make up for the problem of low energy density of Lithium iron phosphate battery, Weilai has directly adopted the new generation of CTP technology, which can simplify the process by 10% in the manufacturing process, and the volume utilization rate of the battery has increased by 5%. Through this design, the energy density of the battery has increased by 14%, reaching 142Wh/kg.

▲ The ternary iron lithium battery adopts the new generation CTP technology

Inaccurate SOC estimation of Lithium iron phosphate battery is also a long-standing problem. Users in the north have a deep understanding of this in winter, and there is still a lot of mileage, but after a long walk, there may not be much mileage left.

This is mainly related to the characteristics of Lithium iron phosphate battery. Public information shows that battery SOC estimation mainly depends on the calibration of open circuit voltage. The steeper the curve of open circuit voltage is, the more accurate the estimation is. However, the open circuit voltage of Lithium iron phosphate battery is flat most of the time.

Weilai's solution is to add a ternary lithium battery cell to the Lithium iron phosphate battery. A battery enterprise technical expert said that the SOC estimation of the ternary lithium battery is more accurate. As long as the capacity is close, the SOC accuracy of the Lithium iron phosphate battery can be improved through the characteristics of the ternary lithium battery.

▲ The ternary lithium battery cell can help improve the SOC estimation of Lithium iron phosphate battery

Zeng Shizhe, Vice President of Weilai Battery System, also said at the press conference that in the ternary lithium iron battery, the ternary lithium battery cell is used as a benchmark to solve the problem of inaccurate SOC of Iron(III) phosphate lithium battery cell.

The battery experts mentioned above said that in the case of series connection, the ternary lithium battery cell can be used as a measuring device for Iron(III) phosphate lithium battery cell to improve the accuracy of SOC.

On the other hand, the low temperature performance of Lithium iron phosphate battery is also very poor in winter, and the ternary lithium iron battery also makes up for this problem. This is also inseparable from the doped ternary lithium battery cells.

▲ Layout of ternary iron lithium battery cells

Due to the physical characteristics, the thermal insulation performance of the ternary lithium battery cell is a little better than that of the Lithium iron phosphate battery, so placing the ternary lithium battery cell around is equivalent to putting a "Down jacket" on the Lithium iron phosphate battery, which can complete the thermal insulation of the battery in winter.

In addition, NIO has deployed a variety of temperature insulation materials outside the battery pack and adopted radiation type active thermal compensation for prevention. In winter, the temperature uniformity of the battery can be improved by 60%, and the minimum temperature of the battery can be increased by 40%. Therefore, NIO's ternary iron lithium battery can perform even better in winter endurance.

▲ The ternary iron lithium battery adopts radiative active thermal compensation

From the perspective of NIO's measures, the use of both hybrid methods and insulation materials is not complicated. However, as many industry insiders have stated, the main barrier to ternary iron lithium batteries lies in algorithm issues, and the algorithm that combines the two battery systems is the top priority.

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