Energy balance based series-wound lithium battery pack protection apparatus

Abstract

The invention relates to the technical field of lithium battery pack management equipment, and specifically discloses an energy balance based series-wound lithium battery pack protection apparatus. The protection apparatus is characterized in that the protection apparatus is provided with a controller, an energy equalization circuit connected with the controller and a protection circuit connected with the controller; the energy equalization circuit comprises a voltage sampling circuit, a rectifying filter circuit, an A / D switching circuit, and an equalization switch circuit; the voltage sampling circuit collects the voltage value between adjacent two serially-connected single lithium batteries; the output end of the voltage sampling circuit is connected with the rectifying filter circuit; the output end of the rectifying filter circuit is connected with the controller through the A / D switching circuit; the control end of the equalization switch circuit is connected with the controller; and the equalization switch circuit is serially connected between the adjacent two single lithium batteries that are in mutual series connection. Compared with the prior art, the energy balance based series-wound lithium battery pack protection apparatus has the obvious advantages of reasonable structure, stable operation, capability of effectively improving the operation safety of the lithium battery pack, and the like.

Description

Technical field: [0001] The invention relates to the technical field of lithium battery group management equipment, in particular to an energy balance-based series lithium battery group protection device with reasonable structure, stable operation and effective improvement of the working safety of the lithium battery group. Background technique: [0002] Due to the characteristics of small size, light weight, high voltage, high power, less self-discharge and long service life, lithium batteries have gradually become the mainstream choice of power batteries. When lithium batteries are used as power batteries, they are often carried out by multiple groups of lithium batteries. Used in series, however, the internal characteristics of each single lithium battery are different, resulting in inconsistent charging and discharging characteristics of the single lithium battery. Abnormal, and even cause security risks. [0003] In order to overcome the adverse effects of the differen...

AI Technical Summary

Problems solved by technology

[0002] Due to the characteristics of small size, light weight, high voltage, high power, less self-discharge and long service life, lithium batteries have gradually become the mainstream choice of power batteries. When lithium batteries are used as power batteries, they are often carried out by multiple groups of lithium batteries. Used in series, however, the internal characteristics of each single lithium battery are different, resulting in inconsistent charging and discharging characteristics of the single lithium battery. Abnormal, and even cause security risks

[0003] In order to overcome the adverse effects of the difference of each single battery in the lithium battery pack on the overall working state of the lithium battery pack, equalization processing should be performed during the charging and discharging process of the lithium battery. At this stage, the energy equalization processing is mostly through the controller to control the relay. Network to switch the balance circuit and connect with different single lithium batteries, and the balance circuit protects the charge and discharge of the single lithium battery. This balance protection circuit requires a one-to-one multi-group relay balance control circuit, which has a complex structure and high processing efficiency. Low

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