Multi-lithium-battery protection system

A protection system, lithium battery technology, applied in battery circuit devices, safety/protection circuits, emergency protection circuit devices, etc., can solve problems such as low voltage withstand capacity, low detection accuracy, unreliable monitoring results, etc., to achieve easy maintenance, The effect of solving the detection error

Inactive Publication Date: 2021-02-02
SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the lithium battery protection system has a low withstand voltage capability, and there is an error in the detected voltage value of each battery, and the detection accuracy is low, resulting in unreliable monitoring results

Method used

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Embodiment Construction

[0025] Such as figure 1 As shown, the application provides a multi-cell lithium battery protection system, including a plurality of level conversion circuits, a battery module 1, an RC module 2 and a detection module 3, wherein:

[0026] The battery module 1 includes a first battery 11 to an xth battery 11, the negative pole of the first battery 11 is connected to the vss terminal, and the negative pole of the kth battery 11 is connected to the positive pole of the k-1th battery 11;

[0027] The detection module 3 includes a first detection circuit 31 to an xth detection circuit 31 and a control logic unit 32. The first detection circuit 31 to an xth detection circuit 31 all include a fifth resistor R5, a sixth resistor R6 and a detection operational amplifier 311. One end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the non-inverting input terminal of the detection operational amplifier 311, the other end of the sixth resistor R6 is connected ...

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Abstract

The invention discloses a multi-lithium-battery protection system, comprising a plurality of level conversion circuits, a battery module, an RC module and a detection module, wherein the battery module comprises a first battery to an x battery, the negative electrode of the first battery is connected with a vss end, and the negative electrode of the k battery is connected with the positiveelectrode of the (k-1)battery; and the detection module comprises first to x detection circuits and a control logic unit, each of the first to x detection circuits comprises a fifth resistor, a sixth resistor and a detection operational amplifier, one end of the fifth resistor is connected with one end of the sixth resistor and the in-phase input end of the detection operational amplifier, the other end of the sixth resistor is connected with the vss end, and the output end of the detection operational amplifier is connected with the control logic unit. According to the invention,level conversion is realized in virtue of the resistors and the operational amplifiers, so the voltages of all the ports of the operational amplifiers are controlled, the grid electrode of a low-voltage CMOS is conveniently used as the input of the operational amplifiers, and errors caused by current flowing into the operational amplifiers are avoided; and thus, the problem of errors of the lithium battery protection system is solved.

Description

technical field [0001] The invention relates to the technical field of lithium battery protection, in particular to a multi-cell lithium battery protection system. Background technique [0002] Lithium batteries are a type of batteries that use lithium metal or lithium alloys as positive / negative electrode materials and use non-aqueous electrolyte solutions. Lithium batteries are widely used in energy storage power systems such as hydropower, firepower, wind power and solar power plants, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and other fields. [0003] When multiple lithium batteries are connected in series to form a large-capacity battery application, the protection system needs to accurately detect the voltage value of each battery. Due to the series application, the relative level of each battery is different. In order to facilitate detection, in the protection system, it is necessary to convert t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02H7/18G01R31/396G01R31/385G01R31/378G01R1/30
CPCG01R1/30G01R31/378G01R31/385G01R31/396H02H7/18H02J7/0029H02J7/0036H02J2207/20
Inventor 崔国庆
Owner SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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