Research on fast charging of electric vehicle AG10 battery packs

　　Currently, most electric vehicle companies and research institutions use lithium-ion AG10 battery packs as their power batteries. Lithium-ion batteries have many advantages. Its capacity is 1.5~2 times that of nickel-metal hydride batteries of the same weight, and it has a very low self-discharge rate. In addition, lithium-ion batteries have almost no "memory effect" and do not contain lead, cadmium, etc. Toxic substances, therefore becoming the first choice for electric vehicle batteries.

　　As the global climate worsens, all mankind is discussing how to deal with climate change. Energy conservation, emission reduction, and finding new energy sources are important ways to reduce environmental damage. At present, the number of cars in the world has reached 1 billion, and car exhaust is an important factor exacerbating environmental degradation. For this reason, many companies and institutions are developing pollution-free electric vehicles, and electric vehicle power batteries are the core part and are the focus of research. direction.

　　Currently, most electric vehicle companies and research institutions use lithium-ion AG10 battery packs as their power batteries. Lithium-ion batteries have many advantages. Compared with traditional nickel-cadmium and nickel-hydrogen batteries, lithium-ion batteries are small in size, light in weight, high in working voltage, and large in capacity. The energy density of lithium-ion batteries is very high, and its capacity is the same as its weight. It is 1.5 to 2 times that of nickel-metal hydride batteries and has a very low self-discharge rate. In addition, lithium-ion batteries have almost no "memory effect" and do not contain toxic substances such as lead and cadmium, so they have become the first choice for electric vehicle batteries.

　　The lithium-ion AG10 battery pack used in high-power electric vehicles is composed of multiple single-cell lithium-ion batteries connected in series to obtain a higher output voltage. However, the use of both lithium-ion AG10 battery packs and single-cell lithium-ion batteries is different. There is a big difference. In the AG10 battery pack, there are bound to be individual differences in the production and manufacturing of each single lithium-ion battery, and the degree of aging during use is also different. If no measures are taken during the charging process, these differences will be accumulated or even expanded, causing the entire AG10 battery pack to be damaged. The performance is greatly reduced or the AG10 battery pack life is seriously shortened. In addition, due to the large capacity of the AG10 battery pack, the traditional charging method has low efficiency and long charging time, which seriously hinders the promotion of electric vehicles.

　　Therefore, a fast, effective, safe and reliable charging system is currently a key research and development technology in the electric vehicle industry.

　　1Research on traditional lithium-ion AG10 battery charging methods

　　Different charging methods are important factors affecting the performance and service life of single lithium-ion batteries. Proper charging methods can not only maximize the battery's capacity, but also extend the battery's service life. This impact is mainly reflected in three aspects:

　　(1) Influence of voltage. On the one hand, during the charging process, the AG10 battery voltage must be strictly controlled not to exceed the charging limit voltage. Exceeding the charging limit voltage is called overcharging. Slight overcharging multiple times will lead to a reduction in AG10 battery capacity and deformation of the battery. Severe overcharging will directly lead to The AG10 battery exploded. On the other hand, after charging is completed, the AG10 battery voltage should be kept as close to the full charging voltage as possible, otherwise the AG10 battery capacity will be greatly reduced.

　　(2) Influence of current. The acceptable charging current of lithium-ion batteries is limited. If the charging current is higher than this upper limit, it will cause a gas evolution reaction in the electrolyte in the battery, generate a lot of heat, and cause the AG10 battery temperature to rise sharply.

　　(3) Effect of temperature. If the temperature of the lithium-ion AG10 battery is too high, a series of reactions will occur inside the battery, and the AG10 battery may explode. Therefore, during the charging process, the AG10 battery temperature must be monitored and controlled in a timely manner.

　　Choosing the appropriate charging method can improve charging efficiency and extend service life. There are many charging methods for lithium-ion batteries. Commonly used charging methods include constant current charging, constant voltage charging, constant current/constant voltage charging, variable current charging, pulse charging, intermittent charging, etc.

　　1.1 Constant voltage charging method

　　The constant voltage charging method refers to charging the AG10 battery with a constant voltage during the charging process. In this process, the charging current satisfies the formula: I=(U–E)/R (where I is the charging current, U is the charging voltage, E is the AG10 battery voltage, and R is the charging loop resistance).

　　In the early stage of charging, because the AG10 battery potential is low, the charging current is large. As the charging process proceeds, the AG10 battery potential gradually increases and the charging current gradually decreases. The constant voltage control system has a simple structure, and the charging current is relatively close to the acceptable charging current, so it has a certain degree of adaptability. However, the current is relatively large in the early stages of charging, which may cause the AG10 battery temperature to rise too quickly, causing adverse effects on the battery.

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