Lithium-ion battery needs to be solved

The development of lithium-ion battery is a new type of power technology that can be used in any kind of driving vehicles, such as electric bicycles, electric motorcycles, electric cars, electric bus and bus, as well as UPS, mobile laser power, mobile lighting. Power supply, mobile communication equipment, military field,special field, etc., its electric motorcycle lithium battery uses a wide range of fields, with an inestimable market prospects. However, based on the characteristics of the lithium ion power battery, that is, the charging voltage cannot exceed 4.2V, and the discharging voltage cannot be lower than 2.6V, the solution to the technical problem of using the lithium battery is urgent and urgent.

The advent of lithium-ion batteries has undoubtedly brought a crisis to the traditional electric motorcycle lithium battery manufacturer drive technology. However, in view of the unique performance of lithium-powered batteries, it has decided that it must have superb use technology before it can enter the market as soon as possible. According to the current lithium battery manufacturing technology, it has indeed reached a perfect level. For example, the 10Ah battery internal resistance can reach 10mΩ, while the 50Ah, 100Ah battery internal resistance is only about 1mΩ, which makes battery experts do it. Surprised. However, the debut of lithium-ion batteries has also made the use of the market feel abrupt. When many users are interested in the technology of high-tech electric motorcycle lithium battery manufacturers, and they are excited to try it out, the problem has arisen: lithium-powered batteries are used as power, and must be connected in series to the need of voltage. The connection of several dozens or even hundreds of batteries, after a period of use, will produce uneven voltage, which is not a technical problem of battery production, but because the battery is in the production process, starting from the film. It takes a lot of processes to become a finished product. Even after a rigorous testing procedure, the voltage, resistance, and capacity of each group of power supplies are consistent, and after using for a period of time, there will be such a difference. Like a twin born by a mother, when she was born, her mother could hardly tell. However, when the two children continue to grow, this difference will be highlighted. Lithium-powered batteries are also the same, and after using them for a period of time, the overall voltage control method is difficult to apply. For a 36V battery stack, 10 batteries must be connected in series. The overall charge control voltage is 42V, while the discharge control voltage is 26V. With the overall voltage control method, the initial phase of the battery is particularly good, and there may be no problem. However, after using for a period of time, the internal resistance of the battery fluctuates with the voltage, resulting in an inconsistent state. (Inconsistent is absolute and consistent. Sex is relative) Therefore, the overall voltage control is still unable to achieve its purpose in this case. For example, when 10 batteries are discharged, the voltage of two of the batteries is 2.8V, the voltage of the four batteries is 3.2V, and the voltage of the four batteries is only 3.4V. The current overall voltage is 32V. If we continue to discharge and continue to work until 26V, Two 2.8V batteries will be in an over-discharged state below 2.6V, and a lithium battery will be discarded if it is over-discharged several times. On the other hand, if the charging is performed by the overall voltage control charging, an overcharge condition may occur. For example, when the above 10 batteries are charged at the current voltage state, when the overall voltage reaches 42V, the two 2.8V batteries are still in a "starved" state, and will quickly absorb the power, and exceed 4.2V, as is well known. Overcharged batteries of more than 4.2V are not only scrapped due to excessive voltage, but also bring danger. This is the characteristic of lithium-powered batteries. Therefore, the material of the characteristic can only be used if it has mastered its characteristics, and it is like a wild horse. Only when the reins are put on it can it be tamed.

However, since the invention of lithium batteries, the use of technology has been continuously improved, such as small-capacity mobile phone batteries, the use of technology has reached a perfect level, but the use of high-power large-capacity lithium-power battery technology is still in the development stage .

Recently, many experts have adopted a single-mode voltage-controlled constant-current charging method for a small-capacity 10AH battery, that is, using the overall voltage control during discharge, and protecting it when the voltage is high, and stopping the operation, for example, at an overall voltage of 30V. When it is controlled to stop working, it is generally not in the battery pack with better consistency, the voltage of the single battery will not be lower than 2.6V. In the charging, due to the unit charging, the monomer control, that is, the operating efficiency of each battery can be achieved to a desired degree. However, this control still can not meet the needs of users, and failed to make the battery reach 100% of the workload, such as an electric bicycle company in Guangdong, charging a battery pack of 10AH/36V once, and its driving speed is 60km. Another electric bicycle company uses the same type of battery pack test, and its driving speed is 75km. It must be said that the technology of using lithium-powered batteries is high and low. In view of the fact that the technology of lithium-ion battery is the secret of each R&D unit, it invests a lot of human and material resources in the research and development process. Therefore, the use of high technology means that they develop the market and strive for the capital of the brand.

The ideal management of lithium-powered batteries should be balanced protection control. The requirements of this control are several tens or even hundreds of battery packs. Each battery can not only manage and protect, but also make each battery discharge. The voltage of the battery is balanced and equal, like several tens of cups of water, and the balance is consistently flowed on the same horizontal line; when charging, it is also like dozens of cups of water of the same horizontal line, which are uniformly and uniformly charged on the same voltage line.

The above requirements seem to be harsh, but lithium-ion batteries are expected to be fully recognized by consumers, which will be an indispensable condition. At present, many users, especially consumers, do not know how to deal with individual monomers and how to deal with individual cells. Therefore, the management of lithium-powered batteries can only be opened up to a huge market. In summary, the lithium-ion battery market is currently in urgent need of solving technical problems.

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