4 results about "Overcharge" patented technology

The invention provides a lithium ion battery and an electrolyte thereof. The electrolyte comprises a lithium salt and a non-aqueous organic solvent, and also comprises an overcharge protect additive and an auxiliary film-forming additive. The lithium ion battery comprises the electrolyte. The lithium ion battery is capable of avoiding problems such as lithium ion battery direct current resistance increasing and electrochemical performance deterioration caused by adding of the overcharge protect additive effectively, and possesses excellent overcharge resistance.

The invention discloses a durable overcharge lithium ion electrolyte with excellent anti-overcharge characteristic and a lithium battery using the same. Said durable overcharge lithium ion electrolyte contains an additive shown as right structure formulation, and weight rate of the additive in the lithium ion electrolyte is 0.01%-33.6%; in right structure formulation, X, Y, Z come from alkyl, alkoxy, aryl group, hydroxy, carboxyl, aether-oxyl or halogen with carbon atom between 0-12. The lithium ion battery can be prepared by using the durable overcharge lithium ion electrolyte. The additive added to the lithium ion electrolyte can increase durable overcharge property of the electrolyte efficiently, increase charge/discharge cycle efficiency, hardly effects normal property of the lithium ion battery and perfectly satisfy application need.

The existing charger has many components, such that the circuit is complicated. The invention provides a simple and practical charger with a simple structure in order to solve the shortcomings in the above background technology. The charger with the simple structure comprises a power supply; a capacitor, a rectifier diode D1 and a battery are sequentially connected in series onto the power supply; a rectifier diode D2 is connected in parallel between the power supply and the capacitor; and an overcharge protection module is connected in parallel onto the battery. According to the charger, the structure is simple, the circuit is a capacitor current limiting-type constant charging circuit, the magnitude of the charging current is determined by the current limiting capacitor C, and the magnitude of the charging current stays unchanged whether the charger is used for charging a single battery or charging a plurality of batteries in series.

The invention provides a device and method for realizing a communication cascade of multiple lithium battery groups. The device comprises a host machine, an upper machine and more than one slave machines. The host machine is electrically connected with each of the salve machines respectively. The host machine is also electrically connected with the upper machine. The host machine and each of the slave machines comprise a battery group which is provided with a protective plate, and an isolation communication circuit which is electrically connected with the battery group having the protective plate. Therefore, a use state of each battery group can be effectively monitored so that a situation of an overcharge or an over-discharge of each battery group can be avoided, and a use safety of the whole battery group system is enhanced.