A dash cam is an instrument that records the image and sound of the vehicle while driving. It can record the video images and sounds of the whole process of the car's driving, which can provide evidence for traffic accidents.
A dash cam is roughly composed of a lens, a chip, a sensor, a display and a dash cam solution.
Power supply mode and usage scenarios of the recorder
There are three power modes for today's dash cams: 1. Built-in battery power, 2. Cigarette lighter power, and 3. Fuse power supply. The latter two modes also have products that use batteries as a backup energy source.
The backup batteries used in these modes are generally lithium batteries and supercapacitors.
The dash cam is generally placed on the front windshield of the car, and the high temperature direct exposure has certain requirements for the high temperature resistance of the battery. And the biggest function of the recorder is to record the accidents that may be encountered during driving. Major accidents can often lead to a loss of power to the vehicle or even damage to the recorder. This requires the battery to be able to do a good job of power-off protection, data saving, and uploading. In case of damage, it is not easy to explode and produce toxic substances.
Comparison of supercapacity with lithium batteries
Supercapacitors can generally work in the environment of -40~70°C, in the normal car environment, there is no need to worry about the explosion of overcapacitance due to high temperature or rapid aging, etc.
The over-capacity materials are mainly activated carbon, electrolytic paper, aluminum shell, etc. In the face of knives and axes and hammers, there will be basically no explosion, burning, etc.
When the lithium battery is subjected to high temperatures, it will cause lithium ionization melting, short circuit inside the sub-battery, volatilization of chemical substances in the separation membrane, etc., making the battery flammable and explosive, resulting in the loss of the user's property.