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▲ Ternary iron lithium battery

According to NIO's introduction, this battery has started accepting user orders and will officially begin delivery in November. NIO has now removed the previous 70kWh battery pack, and future users will directly carry the 75kWh battery pack. The new 75kWh battery also supports battery swapping.

At this stage, only Weilai and CATL announced to the outside that they were carrying out research and development of mixed batteries. However, after seeking confirmation from Guoxuan High Tech, the relevant person in charge said that Guoxuan High Tech was also carrying out experiments and research in this regard.

Overall, in the face of difficulties in breaking through the material system, hybrid batteries are also a feasible path to try in the field of power batteries at present. An industry insider said, "These innovations are still highly admirable

02. Consistency Challenges: Shortcomings in Iron Lithium Batteries Still Need to be Remedy

As a new battery technology, ternary iron lithium batteries also face many technical difficulties.

I have also had discussions with multiple industry insiders before, and one of the battery managers from a traditional car company stated that under different battery systems, there is inconsistency in platform voltage, which makes it relatively difficult to control. Additionally, the expansion force, packaging life, and cooling logic of different battery cells may face challenges.

A new energy technology director of a new car brand of a traditional car enterprise believes that the biggest challenge of mixing ternary lithium battery cells and Iron(III) phosphate lithium battery cells is the Battery management system. Different chemical systems, working voltages, SOC detection and calculation, and cell life prediction all require two sets of algorithms.

From the answers of two car company personnel, it can be seen that the difficulty of this type of mixed battery is mainly at the algorithm level, and the algorithm logic of different batteries is not quite the same.

NIO's ternary iron lithium battery adopts new packaging technology and has not had much technical experience before, so there may also be certain hardware challenges.

In addition, a senior battery industry expert believes that there is nothing very complex about this technology. He tried it ten years ago and it can be achieved with current chip computing power and BMS.

However, as the combination of Lithium iron phosphate battery and ternary lithium battery, what we need to solve is the respective shortcomings of these two batteries. As the main component of Lithium iron phosphate battery, solving the shortcomings of Lithium iron phosphate battery has become the main task.

Therefore, there are three main problems faced by the ternary lithium iron battery: 1. The energy density of Lithium iron phosphate battery is too low; 2. The low temperature performance of Lithium iron phosphate battery is too poor; 3. The SOC estimation of Lithium iron phosphate battery is not accurate.

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