Battery car charging time problem

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Battery car charging time problem [Copy link]

Recently, I have been charging my electric bike, and it usually takes 8 hours. Overcharging is not good for the battery and is also dangerous. If I start charging at 8 pm after get off work, it will be almost done at 4 am the next morning, but I can't get up at night to turn off the power, so I have to wait until 10 pm to charge and then cut off the power at 6 am the next day. It is troublesome to operate the whole time. Can I start counting from the time the light turns green, and automatically end the charging after 2 hours of floating charge? I can get the signal from the green light and delay it for 2 hours. Or if the battery is not good and the light cannot turn on, in this case, the power will be automatically cut off after 8 hours (48v12ah)??? Do you have a simple way to implement it? 2 hours, 8 hours, this can be simpler, it doesn't need to be too precise, and it doesn't need to use a complicated digital circuit like a timer

maychang

This can be simpler. It doesn't need to be too precise. It doesn't need to use a complex digital circuit like a timer. The timer is a very simple digital circuit, but it's certainly not the simplest. For the original poster's requirement, a simple single-chip microcomputer may be the most suitable.

qwqwqw2088

To achieve the function of disconnecting the line at a certain time, use a time relay to disconnect it at a certain time. Or, those who have played with microcontrollers have also used timer modules.

chunyang

The timing method can be used. If you want to be more practical, you can estimate the charging time based on the battery capacity and the remaining capacity, and then make a timer with adjustable timing to control the power supply. There are finished products of such timers, which are used in industrial control and are called "time relays". They can directly control the on and off of 220V and are sold on Taobao. If you make your own, the most traditional circuit is based on 555, using a potentiometer to select the timing duration. This is an application that has existed since the 1970s. If you want to pursue low power consumption, you can use MCU, but if you don't have ready-made resources and corresponding development capabilities, it is better to use a 555 circuit or even just buy a finished product.

huo_hu

Batteries generally have charging protection circuits, and they will not charge any further when the voltage reaches a certain level. It is not a big problem for lead-acid batteries to have no protection, as long as the battery is controlled not to heat up.