18650 lithium rechargeable battery

　　Advantages and Disadvantages of Various 18650 lithium rechargeable battery

　　The most commonly mentioned 18650 lithium rechargeable battery are lithium iron phosphate batteries, lithium manganate batteries, lithium cobalt oxide batteries and ternary lithium ion batteries (ternary nickel cobalt manganese).

　　Each of the above batteries has advantages and disadvantages, roughly as follows:

　　Lithium iron phosphate battery:

　　Advantages: long life, multiple battery charging times, good safety factor, good at high temperatures, and low cost.

　　Disadvantages: low specific energy, low vibration density (volume density).

　　Ternary lithium:

　　Advantages: higher than energy, high vibration density.

　　Defects: poor safety factor, poor heat resistance, poor service life, large charge and discharge capacity, harmful raw materials (ternary lithium-ion batteries heat up greatly after charging, and carbon dioxide is easily ignited due to high temperature release).

　　Lithium Iron Phosphate:

　　Advantages: high vibration density and low cost.

　　Disadvantages: Poor heat resistance, the temperature rises significantly after long-term use of lithium iron phosphate, and the attenuation coefficient of battery cycles is serious (such as pure electric vehicle blades).

　　Lithium cobalt oxide:

　　It is generally a 3c product with a low safety factor and is not suitable for 18650 lithium rechargeable battery.

　　In theory, the rechargeable battery we require should have higher energy, high volume density, good safety factor, heat resistance and ultra-low temperature, long cycle life, non-toxic and harmless, high-power battery charging, all advantages combined and low cost Low. But there will be no rechargeable batteries at this stage, so choose the pros and cons among different types of rechargeable batteries. In addition, different pure electric vehicles have different requirements for rechargeable batteries. Therefore, only by paying attention to the long-term identification of pure electric vehicles can we properly identify the rechargeable battery lines.

　　1.Safety

　　The first safety is a prerequisite for cars. Unlike cell phones and computers, cars can be subject to many unpredictable factors in their performance, such as battery charging and collisions from car accidents. All the bad stuff is probably the nuclear powered vehicle being killed. We can see that some elderly people use fake lead-acid batteries without safety measures, and the rechargeable batteries catch fire, suffering from some combustion instances. For example, Tesla's fire hazards continue to increase over the years, despite the fact that Tesla's vehicle safety design solutions are not fatal. It should also be noted that these incidents are very minor collision accidents. The collision itself will not cause harm to the car or people. When the rechargeable battery catches fire, what if there is a more serious accident?

　　2. Service life of polymer core charge and discharge

　　Generally, cars are used for decades, and pure electric vehicle rechargeable batteries have a lifespan of at least 3,000 cycles in 10 years. As a relatively expensive component, it is very critical that the service life of rechargeable batteries can be equal to that of a car. It is necessary to ensure the safety characteristics of the car and the rights and interests of car buyers, so as to promote the sales market. Currently, among the pure electric vehicles produced by various automobile companies in the world, only Qin last year guaranteed a lifetime warranty for lithium ions.

　　The service life of the rechargeable battery is also the service life of the circulation system, not the data of the main parameters of the rechargeable battery. The service life of the rechargeable battery cycle system is closely related to the cycle system of the rechargeable battery, such as the number of charges and discharges, the number of charges, temperature, etc. The service life of the cycle system obtained from the general data of the battery charging laboratory is obtained by the stable charging time of the battery at the optimal temperature of 20 degrees. However, both time scales and temperatures are unstable throughout the journey. That's why battery life in specific applications is far lower than the figures generated by manufacturers, whether on laptops, phones or electric cars. As for small and medium-mileage pure electric vehicles and their long-lasting dual-mode hybrid vehicles, due to less demand for rechargeable batteries, the charge and discharge regulation will be higher, which will have greater harm to the service life.

　　For example, for a 123-cell lithium phosphate battery, the typical life span is 3,000 cycles. However, the 123-type lithium phosphate lithium battery aircraft rechargeable battery has various applications such as 10c battery charging multiples, 4c charging and discharging multiples, etc. The laboratory service life is reduced to 600 times, but the actual service life is only about 400 times, so it can be seen that Damage to life caused by charging and discharging times.

　　In the case of the Bidding, there is only a 13kwh battery powered motor with a maximum output of 110kw. The calculation results show that when Qinmange Electric Power generates electricity, its charge and discharge capacity is large and reaches multiple limits. Especially when the power consumption of the piano is only 50%, its maximum charge and discharge multiple can reach 18c. If the charge and discharge time exceeds 25 degrees Celsius, this will greatly reduce battery life.

　　At the same time, look at the p85tesla car. For a high-power 310kw motor, it looks very big. In fact, the charge and discharge multiple of the rechargeable battery is only 5c. When only 30% of the electricity is used, the maximum charge and discharge multiple is 10c. And Tesla's large-capacity lithium-ion battery, at large levels, avoids rechargeable batteries charging and discharging at high power.

　　Through a simple comparison, we can see the advantages of BYD battery charging and discharging service life.

　　3. Temperature capacity

　　The harm of extreme freezing to rechargeable batteries is mainly manifested in short charging time and low battery capacity.

　　The relative hazards of rechargeable batteries are relatively mild, because lithium batteries can be used below minus 20 degrees, which will occur during the charge and discharge process of the rechargeable battery itself, but the increase in energy and power consumption is inevitable.

　　Damage to pure electric vehicles is similar to that of dual-mode hybrids. Since new energy vehicles have no other driving force, in order to reach the appropriate temperature under extreme freezing conditions, rechargeable batteries must be used for charging and discharging for heating, so energy consumption and mileage will be very harmful. Regardless of the energy and mileage of 100 kilometers, Tesla vehicles have a significant difference in winter.

　　The dual-mode oil-electric mixture is more harmful. Because hybrid engines have diesel engines as reserve energy. For example, in November last year, Baide Auto promoted an event in Hohhot. When the average night temperature was minus 15 to 20 degrees, if you start the car in extremely cold conditions in the morning, the system will automatically switch to HEV mode and the diesel engine will drive The central air conditioner quickly raises the temperature of the car when the temperature returns to EV mode.

　　Extreme heat is very harmful to both pure and hybrid power sources. For example, the charge and discharge of high-power batteries will increase. For example, in a general lithium battery, charging and discharging at 20 degrees Celsius increases the temperature of the rechargeable battery to nearly 50 degrees Celsius. Therefore, high temperature not only affects the service life of rechargeable batteries, but also poses safety risks. For example, the three-dimensional battery of Tesla vehicles can release carbon dioxide in high-temperature natural environments, and carbon dioxide burns. Tesla's cooling system reduces circulating temperatures and protects the rechargeable battery from CO2 escape from the hard case. But when it hits, it still catches fire.

　　4. Concrete energy

　　Compared to the energy, said white is that the net weight of the rechargeable battery can hold kinetic energy. Compared with energy is a key indicator value to distinguish rechargeable batteries, but in my analysis and management system, specific energy is not very important in the performance parameters of rechargeable batteries.

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