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The structural improvement of high-pressure hydrogen storage tank is one of the hot research issues of new energy vehicles. The hydrogen storage tank consists of an aluminum alloy inner liner (inner layer) and a carbon fiber layer (outer layer). Due to the large difference in the specific strength and modulus of the two layers, residual stress exists in the structure after each pressure relief, which seriously affects the service life of the aluminum alloy liner. At the same time, hydrogen is in direct contact with the aluminum alloy liner, resulting in the problem of hydrogen embrittlement of the aluminum alloy liner. To solve the above problems, this paper proposes a method to improve the structure of hydrogen storage tank. Carbon fiber layer is laid on the inner layer of aluminum alloy inner liner, and a composite hydrogen storage structure is designed inside the carbon fiber layer to increase the hydrogen density inside the hydrogen storage tank. Finally, the superiority and effectiveness of the improved structure are verified by comparing with type IV hydrogen storage tank. The structure can effectively alleviate the residual stress inside the structure, avoid the direct contact between aluminum alloy and hydrogen, and further increase the safety of hydrogen storage tank.
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