For electric vehicles and hybrid vehicles, the core technology is the battery. Compared with other types of batteries, the power lithium-ion battery has the disadvantages of high cost and poor safety performance, but it has important advantages such as high specific energy and long cycle life. The advantages, therefore, have a broader development prospects. The technical development of power lithium-ion batteries is also changing with each passing day, and improvements have been made in terms of both capacity and structure. Experts have stated that regardless of the technical route adopted by battery manufacturers, safety, high temperature range, and wide range of environmental temperature difference should be satisfied. Strong, multi-rate discharge, good use and other conditions.
Battery capacity involves technology and cost
Lithium-ion batteries can be divided into small batteries and large batteries according to their size. Small batteries are commonly used in 3C electronic products. The related technologies and industries have developed very well and the overall profits have been decreasing. At present, more than 85% of lithium-ion battery products are small batteries.
Large batteries are also commonly referred to as power batteries. There are also two kinds of small power batteries and large power batteries. The former is mainly used for power tools, electric bicycles, etc. The latter is used in the field of electric vehicles and energy storage. At present, three types of electric vehicles, namely electric-only (EV), plug-in hybrid (PHEV) and hybrid (HEV) vehicles, are in a period of rapid development and are receiving much attention from the industry. As the core of the future automobile industry, the development of the power lithium-ion battery industry has received unprecedented attention and has been raised to a strategic level by major countries.
Yang Rukun, president of Shenzhen Jiyang Automation Technology Co., Ltd., said that small batteries can neither be compared with large batteries in terms of product profit or scale of development. Although the current size of the power lithium-ion battery industry is still small, electric vehicles are Mass production has brought important development opportunities for the power lithium-ion battery industry. According to estimates of industry authorities, in recent years, the power lithium-ion battery market will exceed the size of the global mobile phone lithium-ion battery market, this change will trigger a new round of investment in related manufacturing equipment and plants, at the same time, the new entry into the power lithium The major manufacturers of ion battery industry will make the technology competition in related fields more intense.
At present, whether the single-cell high-capacity battery technology solution or the small-capacity battery parallel technology solution has always been a controversial issue in the industry. Which technology route to adopt in the end depends on the results of the battery pack, depending on whether it is in terms of size, weight, or Product quality, performance, price, and ease of installation are competitive.
Yang Rukun said that the use of single-cell high-capacity and small-capacity parallel-connected batteries on PHEVs, HEVs, and EVs is very different. The use of single-cell, high-capacity batteries has low assembly costs, but low direct manufacturing rates and high battery costs. It is not conducive to thermal management and other deficiencies; small-capacity parallel battery packs have a high single-pass rate, low cost, and good safety performance, but there are too many connections between them, and they need to solve the problem of integrated assembly costs. Therefore, to realize the best performance of the battery, it is necessary to consider many issues such as manufacturing efficiency, automation, packaging, electricity, heat, safety, monitoring and control, and interface with other parts of the vehicle. What kind of technology should be used in different situations must be weighed against specific applications. Analysis, as to which type will be popular, depends on the future development of battery materials, battery design, and battery manufacturing technology.
Wang Jinliang, deputy director of the China Battery Industry Association, said that whether the battery pack uses high-capacity single-cell batteries or small-capacity batteries in parallel does not only involve technical issues but also involves cost issues. He believes that the use of large-capacity single-cell batteries in series is more reasonable, but also more competitive in the market. At present, some companies use a few (10,000) "18650" small batteries in series to create a power battery pack, which is based on a relatively mature small battery technology and has been applied to notebook computers for a long time. Good sex, plus no mature large battery production experience and other considerations. From the mathematical probability analysis, the probability of product defects and process defects will increase dramatically with the number of tens of thousands of batteries being mixed. In addition, the use of more spare parts for small batteries, such as housings, connectors, and cell protection ( Balancing) components and so on, the cost will increase significantly, technically even if feasible, will eventually be eliminated by the market.
Battery structure should be considered comprehensively
In addition to the capacity, the current structure of the lithium-ion battery is not the same: High-power type uses more winding structures, and high-energy type uses more laminated structures. "As a power battery, I'm still more inclined to laminate technology, the thermal runaway of the winding is difficult to control, and heat dissipation is a problem." Yang Rukun said.
He believes that from the perspective of facilitating manufacturing, there are currently three kinds of power batteries that are gradually becoming mature. They have common characteristics, such as mature parts and equipment, relatively large relative production, and more manufacturers. These three kinds of routes are: First, winding cylindrical batteries, such as the power of the 18,26,32 and 42 series; Second, winding square power battery, the performance of the internal multi-cell combination, forming a large capacity (50 ampere-hours (Left and right); Third, laminated batteries, relatively speaking laminates can do a larger capacity battery. “Overview of the development of global power lithium-ion batteries, there are not many large-scale production of monomers at 100 amps or more. We think this is not a pure design and gut problem, but we must consider the chemical mechanism of power batteries comprehensively. , The thermal characteristics of the battery, electromagnetic field characteristics, the manufacturability of the battery, the supply of battery materials and components, the maturity and reliability of the equipment, etc." Yang Rukun said.
Wei Xuezhe, an associate professor of the School of Automotive Engineering at Tongji University, told reporters that in terms of battery specifications, it is mainly divided into square laminations and cylindrical shapes. For the application of new energy vehicles, Shanghai Perpetual Automotive Battery Co., Ltd. will adhere to the technical route of square laminations, based on:
From the standpoint of monomers, the square lamination technology can better derive the internal heat of the battery, which is favorable for the consistency of the temperature distribution; from the standpoint of the module, it is favorable for the heat dissipation of the monomer and the cooling system of the module and the battery pack. The combination meets the requirements for long cycle life and shelf life of new energy vehicles.
When the square laminations are grouped, they can have better space utilization. Space utilization is one of the most thorny problems in the layout of new energy vehicles.
Wei Xuezhe said that there is no doubt that the current maturity of small cylindrical battery production technology and equipment is higher than the large square laminated battery, that is to say, from the perspective of the power battery industry chain, to make small cylindrical batteries is to keep the difficulties Gives battery module integration, battery pack integration, and automotive applications. Shanghai Hengdong Automobile Battery Co., Ltd. does not intend to evade this issue. It will use square-stacked battery design and manufacturing as a breakthrough point. It will use module integration and battery pack design as the basic application boundary. It will combine battery management technology to solve the industry with a clear and clean interface. Basic technical problems in the chain.
Battery capacity involves technology and cost
Lithium-ion batteries can be divided into small batteries and large batteries according to their size. Small batteries are commonly used in 3C electronic products. The related technologies and industries have developed very well and the overall profits have been decreasing. At present, more than 85% of lithium-ion battery products are small batteries.
Large batteries are also commonly referred to as power batteries. There are also two kinds of small power batteries and large power batteries. The former is mainly used for power tools, electric bicycles, etc. The latter is used in the field of electric vehicles and energy storage. At present, three types of electric vehicles, namely electric-only (EV), plug-in hybrid (PHEV) and hybrid (HEV) vehicles, are in a period of rapid development and are receiving much attention from the industry. As the core of the future automobile industry, the development of the power lithium-ion battery industry has received unprecedented attention and has been raised to a strategic level by major countries.
Yang Rukun, president of Shenzhen Jiyang Automation Technology Co., Ltd., said that small batteries can neither be compared with large batteries in terms of product profit or scale of development. Although the current size of the power lithium-ion battery industry is still small, electric vehicles are Mass production has brought important development opportunities for the power lithium-ion battery industry. According to estimates of industry authorities, in recent years, the power lithium-ion battery market will exceed the size of the global mobile phone lithium-ion battery market, this change will trigger a new round of investment in related manufacturing equipment and plants, at the same time, the new entry into the power lithium The major manufacturers of ion battery industry will make the technology competition in related fields more intense.
At present, whether the single-cell high-capacity battery technology solution or the small-capacity battery parallel technology solution has always been a controversial issue in the industry. Which technology route to adopt in the end depends on the results of the battery pack, depending on whether it is in terms of size, weight, or Product quality, performance, price, and ease of installation are competitive.
Yang Rukun said that the use of single-cell high-capacity and small-capacity parallel-connected batteries on PHEVs, HEVs, and EVs is very different. The use of single-cell, high-capacity batteries has low assembly costs, but low direct manufacturing rates and high battery costs. It is not conducive to thermal management and other deficiencies; small-capacity parallel battery packs have a high single-pass rate, low cost, and good safety performance, but there are too many connections between them, and they need to solve the problem of integrated assembly costs. Therefore, to realize the best performance of the battery, it is necessary to consider many issues such as manufacturing efficiency, automation, packaging, electricity, heat, safety, monitoring and control, and interface with other parts of the vehicle. What kind of technology should be used in different situations must be weighed against specific applications. Analysis, as to which type will be popular, depends on the future development of battery materials, battery design, and battery manufacturing technology.
Wang Jinliang, deputy director of the China Battery Industry Association, said that whether the battery pack uses high-capacity single-cell batteries or small-capacity batteries in parallel does not only involve technical issues but also involves cost issues. He believes that the use of large-capacity single-cell batteries in series is more reasonable, but also more competitive in the market. At present, some companies use a few (10,000) "18650" small batteries in series to create a power battery pack, which is based on a relatively mature small battery technology and has been applied to notebook computers for a long time. Good sex, plus no mature large battery production experience and other considerations. From the mathematical probability analysis, the probability of product defects and process defects will increase dramatically with the number of tens of thousands of batteries being mixed. In addition, the use of more spare parts for small batteries, such as housings, connectors, and cell protection ( Balancing) components and so on, the cost will increase significantly, technically even if feasible, will eventually be eliminated by the market.
Battery structure should be considered comprehensively
In addition to the capacity, the current structure of the lithium-ion battery is not the same: High-power type uses more winding structures, and high-energy type uses more laminated structures. "As a power battery, I'm still more inclined to laminate technology, the thermal runaway of the winding is difficult to control, and heat dissipation is a problem." Yang Rukun said.
He believes that from the perspective of facilitating manufacturing, there are currently three kinds of power batteries that are gradually becoming mature. They have common characteristics, such as mature parts and equipment, relatively large relative production, and more manufacturers. These three kinds of routes are: First, winding cylindrical batteries, such as the power of the 18,26,32 and 42 series; Second, winding square power battery, the performance of the internal multi-cell combination, forming a large capacity (50 ampere-hours (Left and right); Third, laminated batteries, relatively speaking laminates can do a larger capacity battery. “Overview of the development of global power lithium-ion batteries, there are not many large-scale production of monomers at 100 amps or more. We think this is not a pure design and gut problem, but we must consider the chemical mechanism of power batteries comprehensively. , The thermal characteristics of the battery, electromagnetic field characteristics, the manufacturability of the battery, the supply of battery materials and components, the maturity and reliability of the equipment, etc." Yang Rukun said.
Wei Xuezhe, an associate professor of the School of Automotive Engineering at Tongji University, told reporters that in terms of battery specifications, it is mainly divided into square laminations and cylindrical shapes. For the application of new energy vehicles, Shanghai Perpetual Automotive Battery Co., Ltd. will adhere to the technical route of square laminations, based on:
From the standpoint of monomers, the square lamination technology can better derive the internal heat of the battery, which is favorable for the consistency of the temperature distribution; from the standpoint of the module, it is favorable for the heat dissipation of the monomer and the cooling system of the module and the battery pack. The combination meets the requirements for long cycle life and shelf life of new energy vehicles.
When the square laminations are grouped, they can have better space utilization. Space utilization is one of the most thorny problems in the layout of new energy vehicles.
Wei Xuezhe said that there is no doubt that the current maturity of small cylindrical battery production technology and equipment is higher than the large square laminated battery, that is to say, from the perspective of the power battery industry chain, to make small cylindrical batteries is to keep the difficulties Gives battery module integration, battery pack integration, and automotive applications. Shanghai Hengdong Automobile Battery Co., Ltd. does not intend to evade this issue. It will use square-stacked battery design and manufacturing as a breakthrough point. It will use module integration and battery pack design as the basic application boundary. It will combine battery management technology to solve the industry with a clear and clean interface. Basic technical problems in the chain.
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