Limiting voltage additives(overcharge protection additives) are closely related with the safety of lithium ion batteries.

The action mechanism and charactieristis of some overcharge protection additives including lithium halides, metallocenes, metal complexes with phenanthroline or bipyridine as ligands, aromatic compounds, thianthrene, anisole, dianisole derivatives are also introduced.

This paper is intended to review the recent progresses on the study of safety-enhancing additives including flame retardants to the commercially available carbonates-based electrolytes and overcharge protection(such as redox shuttles,potential-sensitive and temperature-sensitive) additives to the electrode as well as to the electrolytes for lithium ion batteries.

In a photovoltaic system,external temperature and electrolyte temperature have some effects on overcharge cut-off voltage of battery.

Aplication of cyclohexyl benzene and triethyl amine for overcharge protection of Li-ion batteries;

Cyclohexylbenzene as overcharge protection additive in lithium ion batteries;

Xylene as overcharge protection additive in lithium ion battery

At present the bus charging protections have some disadvantages and shortcomings.

Aimed at the problems of relay protection during charging test of the buses,a new method of intelligent bus-charging protection is presented in this paper.

Aiming at the design deficiency of the electromagnetic busbar charging protection that only considering bus and line charging,the paper makes an analysis from the aspects of fundamental principle,secondary loop,flexibility of operation,security,and reliability.