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Do Hybrid Vehicles Get Discharged?

Hybrid vehicles have continued to evolve to achieve higher efficiency. If so, do the hybrid cars these days get discharged? Let's take a closer look at the misunderstandings and truths about the latest hybrid cars and how to respond when the power is cut off.


Unlike a general internal combustion engine, a hybrid vehicle uses the power of an electric motor and an engine together. Therefore, it has a larger battery than an internal combustion engine. So, will the hybrid car be free from the battery discharge problem? Here are the answers to the questions related to hybrid cars.


Are there no batteries 12v in hybrid cars?

No. A hybrid vehicle consists of a high-voltage battery that runs the electric motor and a 12V low-voltage battery that powers the automotive electronic system.


Are the 12V low-voltage battery of a hybrid car better than the lead-acid battery?

Yes. Modern hybrid vehicles have lithium iron phosphate batteries instead of lead-acid batteries. Lithium iron phosphate batteries are significantly better than lead-acid batteries, considering the volume and weight.


Are the latest hybrid cars frequently discharged?

That's not true. Hybrid vehicles house a battery protection function to automatically shut off power in case of over-discharge. This is clearly different from discharge.


If you frequently use the ‘12V BATT RESET’ function of a hybrid vehicle, will the battery life shorten?

This is also not true. The ‘12V BATT RESET’ function reconnects the cut-off power to protect the battery. In other words, it doesn't significantly affect battery life.


The reason we first look into the characteristics of hybrid vehicles is because of misunderstandings about electric discharge. Recently, as hybrid vehicles have become very popular, the discharge symptoms of hybrid vehicles are also becoming an issue. The driver of the hybrid vehicle experiences the vehicle's discharge even though the black box's power-off function is set. In fact, this is not the discharge of the hybrid car, but the battery protection function activated. In addition, the black box's power-off function is set based on a general internal combustion engine vehicle, so it cannot function properly in a hybrid vehicle.


In order to solve the above-mentioned discharging problem, it is necessary to understand the battery characteristics of a hybrid vehicle first. First, let's take a look at the battery composition of a hybrid vehicle. The internal combustion engine vehicle is powered by a 12V battery, but the battery of a hybrid vehicle consists of a high-voltage battery and a low-voltage battery. The two batteries have different roles as much as the difference in voltage and capacity. The high-voltage battery is used as an energy source to add power to the vehicle, and the low-voltage battery supplies power to the vehicle’s electric field (most electrical and electronic devices and facilities in the vehicle). do. In other words, a high-voltage battery is used to operate a hybrid vehicle, but a 12V battery is required to operate all other electric devices, just like conventional internal combustion engines do.


The reason why a hybrid vehicle consists of both a high-voltage battery and a low-voltage battery is to increase energy efficiency. Usually, to move a vehicle weighing more than 1.5 tons, an electric motor that exerts a powerful force must be driven. However, all vehicle electronic systems other than electric motors are standardized to 12V. For this reason, the battery of a hybrid vehicle is divided into high voltage and low voltage.

Tina Yu

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