As soon as winter comes, there will be electric bicycle users who complain that the "little electric donkey" does not run as far as in summer, and always feel that there is a problem with the battery, so what is the reason for this?
Why does the range of electric bikes decrease?
Analysis from the aspect of winter charging saturation
In general, the optimal operating temperature of the battery is about 25. In winter, the temperature is low, the battery is in a low temperature environment, the battery cycle capacity is relatively low, the viscosity of the electrolyte increases, the chemical reaction resistance increases, the charging capacity is 60% 70%, the discharge amount is 50% to 60%, and the mileage is reduced. Therefore, even if you buy a new electric bicycle, there will be a problem of poor battery life in winter.
Lithium-ion batteries for electric bicycles (GB T 36972-2018) stipulates that the cycle life of electric bicycle battery packs should not be less than 600 times.
Analysis from the aspect of discharging when the battery is working in winter
When the temperature is about 25, the lead-acid battery can store electricity normally and can discharge to the maximum extentWhen the temperature drops below 10, the amount of electricity stored in the lead-acid battery is automatically reduced by about 20%. Below 0, the stored power decreases even more, so there is less power left to meet the ride.
Common types of e-bike batteries.
Accumulators and chargers for e-bikes Part 1: Sealed lead-acid batteries and chargers (QB T 2947.)1-2008) stipulates that the fully charged battery will be placed in the (-10 1) environment for 10 hours to test the low-temperature discharge capacity, and its capacity should not be less than 75% of the rated value.
Other reasons
Of course, there are other common factors that electric bicycles can't run far in autumn and winter, not necessarily battery problems, if you are more worried about being affected by other aspects, you can go to the repair shop for a comprehensive test.
A common factor that an e-bike can't run far.
What are the common quality problems of e-bike batteries?
In 2023, the Shanghai Municipal Administration for Market Regulation will conduct a supervision and random inspection of the quality of electric bicycles produced and sold in the city. This time, 20 batches of products were randomly inspected. After inspection, there were 3 batches of unqualified batteries, mainly chargers and batteries (battery tamper-proof) items.
The standard General Technical Specification for Electric Bicycles (GB 17761-2018) mentions that the tamper-proof battery of electric bicycles should meet the following requirements:
Dealers and consumers should avoid expanding and modifying the electric bicycle battery, as the battery voltage or current will cause harm to the human body or cause **.
Precautions for use
When using an e-bike in winter, it is recommended to pay attention to the following points, which can make the e-bike run farther and safer