Nowadays, electric bicycles tend to develop in the direction of high-end intelligence.Electric bicycle research and development manufacturing technology is constantly improving, the production process is also day
Gradually mature.But there is a drawback, but has been restricting the development of electric vehicles, that is the core of electric bicycles – “lithium battery”!
At present, lithium batteries have been widely popularized in the energy storage market.Take the battery for comparison, lithium batteries no matter in terms of weight, or from the size of lithium batteries are relatively advantageous.Many people are concerned about the life of lithium batteries, because the life of general lead-acid batteries (referred to as batteries) will end in about 3 years, so consumers are more concerned about the life of lithium batteries.
Lithium battery” is a kind of battery made of lithium metal or lithium alloy as negative material and using non-aqueous electrolyte solution.Due to its very active chemical properties, lithium metal has high environmental requirements for processing, preservation and use.So lithium batteries have not been used for a long time.With the development of science and technology, lithium battery has become the mainstream now, in theory, “lithium battery” cycle life of around 600 times, please see the details below!
Can the lithium battery life of an electric bicycle last up to 5 years?
Correct statement: lithium battery life can use 5 years is related to the number of charging cycle, and the number of charging has no direct relationship.To put it simply, for example, a lithium-ion battery USES only half of its power on the first day, and then recharges it.If you do it the next day, you charge half of it and get two charges, which counts as one charge cycle, not two.As a result, it can often take several charges to complete a cycle.After each charging cycle, the amount of power decreases a little.However, the reduction is very small, as high-quality batteries retain 80% of their original power after multiple cycles, which is why many lithium-ion products are still in use after three or four years.Of course, lithium battery life to the end or need to replace.
It says that the theoretical life of a lithium battery is about 600 charge cycles.Assuming that the electric quantity provided by a complete discharge is Q, if the reduction of electric quantity after each charging cycle is not taken into account, the lithium electric quantity can provide or supplement about 600Q electric quantity in its lifetime.So we know that if we charge it every time we use 1/2, we can charge it 1,000 times or so;If you charge it one third at a time, you can charge it about 1500 times.Similarly, if the charge is random, then the number of times.Anyway, no matter how you charge it, it’s going to be a total of 600Q of electricity that’s going to be constant.So, we can also understand this: lithium battery life is related to the total amount of battery charge, and has nothing to do with the number of charges.The effect of deep discharge and shallow discharge on lithium battery life is not different.
In fact, shallow discharge and shallow charge are more beneficial to lithium battery. Deep discharge and deep charge are necessary only when the power module of the product is calibrated for lithium battery.Therefore, products powered by lithium need not be stuck in the process. Everything should be convenient and charged at any time without worrying about affecting the life.
The capacity impairment of lithium battery can be expressed in the charging and discharging process of lithium battery:
1. The charging time of a lithium battery will be reduced a little with each increment of a complete cycle.The charging platform of lithium battery is 3.7V~4.2V, and the charging capacity in this stage accounts for more than 90% of the total charging capacity. With the increase of cycle times and the acceleration of voltage rise, the capacity of lithium battery will decrease after full charge.
2. The discharge platform of lithium battery ranges from 4.1V to 2.75V (the lowest discharge voltage of a single lithium battery is 2.75V), and the discharge capacity in this stage accounts for more than 90% of the total capacity. With the increase of cycles, the discharge platform of lithium battery decreases, and the discharge capacity also decreases.
3. The proportion of self-discharging power of lithium battery in the total power of lithium battery increases with the increase of cycle times, but the acceleration of lithium battery discharge platform decreases.
The characteristic that the life of lithium-ion battery decreases as capacity declines explains: the life of lithium battery is finite after all, this is the same as the development of anything, capacity decline is a kind of expression form that quantity changes to qualitative change.From this performance, it can be seen that the methods to extend the life of lithium battery are undoubtedly considered from the perspective of scientific charge and discharge and reduce self-discharge, and the loss in the process of use will directly affect the life of the battery.
If you want to get the best out of lithium battery life, then consumers must understand the “lithium battery” three taboos!
First, temperature: Lithium battery is afraid of high temperature.
The second, the big electric current, such as 18650 batteries is 3 c discharge, electric cars is 8000 w, you use the batteries is lower than your electric discharge current, it will lead to the lithium battery temperature is too high, excessive current and short service life, still can appear beat scrap, if your electric power is very big, very fast, and choose 10 c current 18650 batteries, so choose the right batteries obviously is very important!
Third, full of electricity storage: three yuan, lithium, electric electricity is 4.35 V, full protection plate is currently on the market by charging 4.2 V, so a lot of people buy electric lithium battery all say no nominal capacity is much, in fact, it is for this reason, general storage electric lithium battery for a long time, with less than 50 TV the best, you buy a new mobile phone, for example, many of them are up fifty percent of the electricity.If it is stored at full charge for a long time, the capacity of the lithium battery will be reduced.Except for lithium iron phosphate and lithium titanate, these two kinds can be fully charged storage, also need to pay attention to is to choose a better quality protection plate, the biggest taboo of lithium batteries is over flush over put, three yuan of lithium over put will be scrapped, overflush must bulking also scrapped.
Pay attention to the above points, your electric bicycle “lithium battery” can last 4~5 years ！
Post time: Feb-02-2021