Battery module equalization circuit with preferential hardware control logic

Abstract

The invention discloses a battery module equalization circuit with preferential hardware control logic. A battery module comprises a plurality of single batteries B which are connected in series. The equalization circuit comprises a plurality of equalization loops (100) and a battery front-end detection chip (200), wherein each single battery B is respectively and correspondingly connected with one equalization loop (100); and the battery front-end detection chip (200) is connected with the plurality of equalization loops (100). According to the invention, the design is scientific, according to the working principle of the battery front-end detection chip, the external equalization switch and the equalization loop are additionally arranged, the current flowing through the equalization switch integrated in the battery front-end detection chip is reduced, and the on and off of the external equalization switch are controlled through the equalization switch integrated in the battery front-end detection chip and the equalization loop; and meanwhile, by designing hardware control logic which can not be started by any adjacent equalization loops, the phenomenon that the equalization switches are broken down by high voltage is avoided, and the reliability of the equalization function is improved.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a battery module balancing circuit with hardware control logic priority. Background technique [0002] In the field of new energy applications, lithium batteries are increasingly used in electrical and electronic products, such as electric vehicles, electric bicycles, electric tools, communication base stations, robots, etc. In order for the lithium battery to be used safely and reliably, it is necessary to configure a battery management system (BMS) to monitor the use status of the lithium battery and implement protection functions such as overcharge, overdischarge, and overtemperature. [0003] In practical applications, a battery module or battery system composed of multiple single cells connected in series is generally used to supply power to the load. However, since the performance of the single cells is not absolutely consistent, there will be a If there is a di...

AI Technical Summary

Problems solved by technology

[0005] For the battery front-end detection chip that integrates the balance switch inside, the maximum value of the balance current allowed is generally about several hundred milliamperes, so when the balance switch inside the chip is turned on, the heat generated by the battery front-end detection chip Therefore, it is necessary to make the conduction time of each equalization switch very short, and the conduction time of the equalization switch is very short, which not only reduces the equalization effect, but also causes the potential failure of the chip due to excessive heat generation, until it fails completely

[0006] In addition, when the capacity of the battery module is large, it is necessary to increase the equalization current accordingly, so limited by the maximum equalization current allowed in the battery front-end detection chip, the equalization current of several hundred milliamps will inevitably reduce the equalization effect;

[0007] In addition, in the existing equalization technical solutions, the equalization switch is often broken down by the voltage. The balance switch corresponding to the single battery at the negative terminal will bear the sum of the voltages of the several single batteries adjacent to it in turn and close to the positive terminal of the battery module or battery system. When the sum of the voltage exceeds the balance switch When the maximum specification value of , it will break down the equalization switch

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