Storage battery charging protection circuit as well as storage battery system and motor vehicle using circuit

Abstract

The invention relates to a storage battery charging protection circuit as well as a storage battery system and a motor vehicle using the circuit. The charging protection circuit comprises a monitoring balance branch, the monitoring balance branch is connected in parallel to each storage battery unit, the monitoring balance branch is provided with at least one bypass element but not provided with a switching element, the bypass element is an element of which the resistance or equivalent resistance is reduced when voltages at two ends reach a set voltage threshold, the bypass element is a voltage stabilizing diode or a piezoresistor, the charging protection circuit further comprises a thermistor with a positive temperature coefficient, the thermistor is connected in series with the storage battery unit, and the formed series branch is connected in parallel to the monitoring balance branch. The charging protection circuit is simplified, the cost is reduced, a storage battery charging protection method is easier to implement, and overcharge, overcurrent and overtemperature of a storage battery are effectively avoided.

Description

technical field [0001] The invention belongs to the field of accumulators, in particular to an accumulator charging protection circuit, an accumulator system and a motor vehicle using the circuit. Background technique [0002] With the continuous development of lithium-ion battery technology, its application fields continue to expand, including personal consumer electronics products, new energy vehicles, and backup power supplies for communication systems. Compared with traditional lead-acid batteries, lithium-ion batteries have many advantages such as no memory effect, high energy density, long cycle life, high power density, environmental protection and no pollution. On the contrary, one of the main disadvantages of lithium-ion batteries is their poor resistance to overcharge. [0003] Existing battery systems often have dozens of unit batteries connected in series. Especially for new energy vehicles, it may be composed of hundreds of battery cells connected in series. ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a charging protection circuit, which is used to solve the problem of complex wiring and control system when realizing charging equalization protection in the prior art; the charging process and equalizing process of the battery can be realized relatively simply, and the battery can be prevented overcharge

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