A battery disconnection protection system and method

Abstract

The invention relates to the field of integrated circuit design, in particular to a battery disconnection protection system and method. The battery disconnection protection system comprises a batterypack, a battery voltage acquisition module, an undervoltage protection timer and a protection and driving module, wherein that battery voltage acquisition module is connected with the battery pack, the battery voltage acquisition module is connected with the undervoltage protection timer, the battery voltage acquisition module is connected with the protection and driving module, and the undervoltage protection timer is connected with the protection and driving module. The invention not only realizes the protection of the battery connection disconnection, but also does not cause the problem ofthe unbalance between the batteries, and can stably judge whether the disconnection protection occurs or not, so that the overvoltage or undervoltage protection is not triggered by mistake. In addition, if the short-circuit protection mechanism can not be triggered effectively when the battery connection is uninterrupted, but there is a sudden decrease of battery voltage caused by instantaneous large current discharge, the protection can also be effectively implemented in the form of disconnection protection.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a battery disconnection protection system and method. Background technique [0002] Such as figure 1 As shown in , the existing technology is to place a current source in the odd-numbered cells in the application of lithium battery protection in series connection, the current source is connected to the positive and negative electrodes of the odd-numbered cells, and there is a disconnection protection comparator in the even-numbered cells. Whether it is an odd-numbered battery disconnection or an even-numbered battery disconnection, the current source of the odd-numbered battery will be used to discharge the external capacitor, reduce the voltage of the odd-numbered battery, and increase the voltage of the adjacent even-numbered battery, thereby triggering the even-numbered battery. A wire break protects the comparator and a protection action occurs. [0003] This existi...

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Problems solved by technology

[0003] This existing technology has current sources in odd-numbered batteries, but not in even-numbered batteries. The current difference between odd-numbered and even-numbered batteries is used to realize disconnection protection, but the current consumption of each battery is inconsistent, which will cause discrepancies between batteries. balanced

And when the protection occurs, the protection speed depends on the discharge speed of the internal current source to the external capacitor, and it is impossible to effectively distinguish the disconnection protection or the overvoltage or undervoltage protection, and it is easy to cause false protection or MOS gate in the protection process. Drive signal oscillates

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