Petrol and diesel fuels form the backbone of today's road transportation. The internal combustion engine has been used in vehicles for around 100 years. But the problem with the engines is the limitation of fossil energy reserves and greenhouse gas emissions responsible for global warming. These fossil fuels generate emissions of pollutants such as PM, Nox and CO which are dangerous for humans. There is an urgent need to embrace alternative renewable energy sources to overcome the energy crisis and achieve decarbonization, energy security and cleaner systems. air to breathe. Fuel cells are devices that convert chemical energy into electrical energy without harmful exhaust emissions. This article summarizes the configuration of the fuel cell hybrid vehicle. It briefly describes the function of each component and the losses occurring in each component. Fuel cells are the quietest and most reliable because they have no moving parts. The efficiency is approximately twice that of the internal combustion engine. [2]. There is no Carnot limitation as in the case of the IC engine. The most commonly used fuel cell is the hydrogen fuel cell in the polymer electrolyte membrane fuel cell (PEMFC). Hydrogen is a clean fuel. The exhaust consists of pure water. The combination of a fuel cell and a battery is studied in this article. Fuel cell hybridization helps reduce the size of the fuel cell and its initial cost but it increases the complexity of the vehicle, the weight and the cost of the battery. At higher loads and greater acceleration, the battery provides extra power and increases the efficiency of the fuel cell. At low load, the fuel cell is used to provide the required power. The battery is also used for starting the vehicle......middle of paper......es by 2030. The cost of FCHEV and BEV are not largely affected by changes in the costs of l 'electricity, but the ICE and FCEV costs are strongly affected by the cost of fuel. This is partly due to the different powertrain efficiencies. Comparing the overall life cycle costs, it can be observed that FCHEVs and BEVs are cheaper than FCEVs and ICEs. But FCHEV and BEV are sensitive to overall capital and operating costs. For example, BEVs in particular are sensitive to battery size. The life cycle costs of ICE and BEV are approximately 1.75 times higher than those of FCHEV and BEV. Several challenges will need to be addressed in the near future for FCHEVs to achieve commercialization, reliability, profitability and performance. Fuel cell hybrid vehicles can certainly be the clean technology used in the future of automotive engines.