Classification of main energy storage products:<br>Electric energy is converted into potential energy: energy storage (large site, high cost), compressed air energy storage (low efficiency), flywheel energy storage (immature).<br>Conversion of electrical energy into magnetic energy: superconducting storage (not yet mature).<br>Conversion of electric energy into thermal energy: hot water energy storage, thermal phase change material energy storage (low efficiency).<br>Conversion of electric energy to fuel: hydrogen production by electrolyzing water (immature technology and low efficiency).<br>Conversion of electric energy to electrochemical energy: battery energy storage (large potential safety hazard, poor low temperature performance, short service life).<br>
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