Industry insiders pointed out that the unified and standardized size of power battery products is the trend of the times and is conducive to further increasing the market concentration of domestic power batteries, reducing the manufacturing cost of power batteries and the pressure of vehicle manufacturers. At present, battery companies, system integration companies, vehicle companies, and battery recycling companies are all actively promoting unified power battery specifications.

Power Battery

However, the survey found that in the process of promoting the unified size of the power battery, the pace of vehicle companies and power battery companies cannot be completely unified, and there are even some conflicts of interest. The unified specification of power battery is still a long way to go.

Car prices regulate battery size awareness

The variety of power battery models and their different sizes significantly restrict the further development of new energy vehicles and power batteries. With the acceleration of the marketization of new energy vehicles, whether it is car enterprises or power battery companies, the demand for standardization of power battery specifications becomes more and more urgent.

The person in charge of the Automotive Standardization Technical Committee pointed out that at present, there are only a few electrochemical systems for industrialized power batteries, but there are no uniform specifications for specific products. This has brought many problems.

On the one hand, it increases the cost of production R&D for battery manufacturers, which is not conducive to the large-scale manufacturing, market investment, and material technology innovation of battery manufacturers. On the other hand, it increases the R&D costs of system integration companies and vehicle companies, and cannot achieve the battery. The rapid selection of monomers makes it difficult to accumulate technology and weakens the competitiveness of vehicle products. At the same time, the battery size is not uniform, but also increases the difficulty and complexity of battery recycling.

From an objective point of view, the chaos of domestic power battery models is due in part to the many requirements of vehicle manufacturers. It is precisely this type of problem that has been recognized. At present, some vehicle manufacturers have begun to regulate the size of their batteries internally, and the joint battery companies are actively exploring battery size standards.

"We have standardized the size of the battery internally, and we have specified several types of batteries for the battery supplier. Through screening, we can get batteries that are more suitable for us," said Ni Shaoyong, president of the New Energy Automobile Research Institute at Chery New Energy Automobile Co., Ltd. It can be led by the automaker, then the battery core plant and the PACK plant can unify the entire architectural technology solution and standard, thereby realizing the transition from multi-model small batch production model of power battery to small batch production, reducing the purchase cost.

In addition to Chery, there are a number of vehicle manufacturers at home and abroad that have begun to attach importance to the specification of power batteries and have begun to strictly regulate the battery size or gradually reduce the battery size of the assembled vehicle.

For example, all Volkswagen Group's future electrified vehicles may shift to a single lithium-ion battery cell design, reducing battery costs by simplifying battery cell design by 66%; BYD's commercial vehicle battery modules have been basically standardized and can meet different models through different assembly structures. The demand; Nanjing Jinlong proposed the same battery size requirements for battery suppliers, so that they can be interchangeable internally.

First unified battery size or battery box

Although the OEM and power battery companies have reached a consensus on the size of the unified power battery, there are many problems in the actual operation process.

In the Exposure Draft, the Ministry of Industry and Information Technology has recommended specifications for the size and size of the cell, module, and system (battery box). There are 2 cylindrical battery cells, 8 rectangular battery cells, 8 soft battery cells, 9 rectangular battery modules, 8 soft battery modules, and 5 standard battery boxes. The recommended battery modules are 12V multiples. The voltage level.

In this regard, the industry believes that uniform battery size specifications, battery companies and vehicle companies are good, but to sort out how many battery models, the number of sizes and specifications need further discussion.

"Battery development is a dynamic process. The unified battery cell size cannot be achieved through human-made regulations." Dr. Huang Xuejie, a researcher at the Institute of Physics of the Chinese Academy of Sciences, believes that we should fully discuss and actively guide which type of battery is used. Battery cell size should be given to the market to complete.

"The size of the battery core can't be limited to a few models, but according to the actual application, starting from the needs of the downstream application terminals, the choice of the entire vehicle company is critical." A person in charge of a battery company that did not want to be named said that due to At present, the development of the domestic power battery industry is not yet mature, and it is difficult to unify the size of battery cells. Only a few sizes are not conducive to the development of new products and new technologies.

Even if the battery model size is highly uniform, the shapes of the battery boxes of various vehicle manufacturers are different, resulting in many problems in the actual application process. Industry insiders suggest that it is better to standardize the size of the battery box or battery pack first, and the suppliers will be free to choose the type to match, and then go back and gradually unite the size of the battery.

However, this method of unifying the battery box and re-uniforming the size of the battery may not be supported by the vehicle company. “Each vehicle company has different design concepts in terms of vehicle structure, PACK scheme, and body weight. It must be a differentiated competition. Therefore, the uniform size of the battery box is unlikely, which is not conducive to electric Automotive product innovation," said Huang Fuliang, product director of Nanjing Golden Dragon.

Ni Shaoyong also believes that it is very difficult to unify the size of the battery box, and the OEM is unwilling to unify to lose its differentiated advantages. From this point of view, in terms of unified power battery specifications, the entire vehicle company and power battery have both a consensus and a disagreement, which requires both parties to conduct more in-depth cooperation. It is worth noting that, in the unified power battery size, the first unified battery module may be a more feasible approach.

Wang Fang, chief battery expert at the China Automotive Technology and Research Center, said that the formulation of the battery module standard is the key link in the specification of the power battery. On the one hand, the demand for power batteries for complete vehicles generally extends to the module level; on the other hand, the use of power batteries for ladders is more realistic with modules.

At the same time, the Automotive Standardization Technical Committee stated that due to the development trend of battery technology development and accelerated development of vehicle development, the size of battery products is also rapidly changing. To avoid “restricting the development and production of new battery products,” the standard will Maintain the revised frequency of 1-2 years to adapt to the rapid development of battery technology and vehicle R&D.

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