This chapter describes the basic principles of electrochemical energy storage and discusses three important types of system: rechargeable batteries, fuel cells and flow batteries. A rechargeable battery consists of one or more electrochemical cells in series. Mechanical: Direct storage of potential or kinetic energy. This conversion process allows electricity generated at one time to be stored and used later, providing flexibility to modern power. . Thermochemical storage systems use the energy of reversible chemical reactions that absorb heat in one direction and release it in the other, for example, the hydration of calcium chloride (CaCl).
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