Battery pack protection circuit and lithium battery system
A technology for protecting circuits and battery packs, applied in battery overcurrent protection, battery circuit devices, safety/protection circuits, etc., to solve problems such as voltage inconsistency, shock, and battery pack charging
Pending Publication Date: 2021-01-26
SHENZHEN CPKD TECH CO LTD +1
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Problems solved by technology
However, different application sites need to store different energy. Some lithium battery packs only consider the current power demand when they are used and installed. If the power demand increases in the future, more energy needs to be stored. Replacement, but no expansion
[0003] In order to meet the increase in electricity demand, the capacity of the single battery is expanded, and there are limitations in the increase of the capacity of the single battery. The parallel connection of single cells, and then the connection in series, however, during the use of lithium battery packs in this way, voltage inconsistencies may occur between multiple single cells connected in parallel, which will cause circulating current or large Problems such as current shock, when the circulation is serious, it will directly cause the battery pack to charge or discharge over-current protection, thus damaging the battery pack
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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0037] In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at leas...
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The invention discloses a battery pack protection circuit and a lithium battery system. The battery pack protection circuit comprises a voltage acquisition assembly, a controller, a switch control assembly and a voltage stabilizing assembly which are connected with one another, wherein the voltage acquisition assembly is provided with a plurality of groups of acquisition ports, and each acquisition port is connected with the output end of one single battery and is used for respectively acquiring differential analog voltage of the output end of each single battery; the controller is used for receiving the plurality of differential analog signals output by the voltage acquisition assembly, comparing the differential analog signals to output a voltage control signal to control the voltage stabilizing assembly, and outputting voltage to a load in a balanced manner through the switch control assembly; and the switch control assembly is provided with a plurality of switches, and each switchis connected with the output end of one single battery and used for connecting / disconnecting each single battery with the load under the control of the controller. According to the scheme, the charging and discharging reliability of the lithium battery system is improved.
Description
technical field [0001] The invention relates to the technical field of battery charge and discharge, in particular to a battery pack protection circuit and a lithium battery system. Background technique [0002] In recent years, lithium-ion battery technology has become increasingly mature, with the advantages of high cycle life, high specific energy, high safety, and environmental protection. This has led to more and more applications of lithium battery packs in communication base station energy storage, household energy storage, and industrial and commercial energy storage. However, different application sites need to store different energy. Some lithium battery packs only consider the current power demand when they are used and installed. If the power demand increases in the future, more energy needs to be stored. Replacement, but no expansion. [0003] In order to meet the increase in electricity demand, the capacity of the single battery is expanded, and there are lim...
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IPC IPC(8): H02J7/00
CPCH02J7/0019H02J7/0063H02J7/00304
Inventor 邓勇明陈雄伟
Owner SHENZHEN CPKD TECH CO LTD