Lithium battery management device based on clamping voltage balance

Abstract

The invention relates to the technical field of battery management, in particular to a lithium battery management device based on clamping voltage balance. The lithium battery management device based on clamping voltage balance is characterized by comprising a controller, a charging circuit connected with the controller, a clamping voltage balance circuit connected with the controller, an overvoltage protection circuit connected with the controller, an overcurrent protection circuit connected with the controller and a temperature detection circuit connected with the controller, wherein a voltage-variable circuit, a voltage-reduction rectifying circuit and at least two sub charging loops are arranged in the charging circuit, the voltage-reduction rectifying circuit is connected with the output end of the voltage-variable circuit, the sub charging loops are connected with the output end of the voltage-reduction rectifying circuit, a relay is arranged in each sub charging loop, each relay is connected with the controller and used for controlling the connection and disconnection of the corresponding sub charging loop, and the clamping voltage balance circuit comprises at least two voltage balance loops and a reference power supply which is used for supplying a voltage threshold to each voltage balance loop. Compared with the prior art, the lithium battery management device based on clamping voltage balance has the remarkable advantages of being reasonable in structure, safe, reliable and the like.

Description

Technical field: [0001] The invention relates to the technical field of battery management, in particular to a lithium battery management device based on a clamp-type balance that can charge multiple groups of single cells in a battery pack in a balanced manner, thereby improving charging and discharging efficiency and battery life. Background technique: [0002] With the development of microelectronics technology, high requirements are put forward for the power supply. Lithium batteries are more and more widely used due to their significant advantages such as high working voltage, high energy density, small size, low self-discharge rate, and no memory effect. Applications. The voltage of a single lithium battery cell is limited. In order to meet the use requirements of power batteries such as electric vehicles, the existing rechargeable batteries are generally implemented in the form of connecting multiple batteries in series. The difference in self-discharge characteristi...

AI Technical Summary

Problems solved by technology

The voltage of a single lithium battery cell is limited. In order to meet the use requirements of power batteries such as electric vehicles, the existing rechargeable batteries are generally implemented in the form of connecting multiple batteries in series. The difference in self-discharge characteristics will cause the remaining power of each single battery in the battery pack to be different after discharge, resulting in the difference in the remaining capacity of the single battery in the battery pack. This difference will increase with the increase in the number of charge and discharge. It becomes more and more prominent, resulting in the reduction of the overall capacity of the battery pack and the shortening of the service life, which is extremely harmful to the rechargeable battery

In addition, the battery pack generates heat during charging and discharging. When the heat is too high, it is easy to damage the battery and affect the service life of the battery pack.

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