Lithium battery/battery pack metering and protection circuit based on current segment detection technology

A detection circuit and detection technology technology, applied in battery circuit devices, emergency protection circuit devices, battery pack components, etc., can solve problems such as increased hardware complexity, excessive discharge, and high temperature of the battery
CN101567475BInactive Publication Date: 2011-12-21TIANJIN VAST TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN VAST TECH
Publication Date
2011-12-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a lithium battery / battery pack measuring and protecting method based on a current subsection detecting technique, which realizes intelligent controls of electric quantity detection for batteries, charge and discharge control, overcurrent / overvoltage protection, short circuit protection, and the like, and adopts a micro-control unit (MCU) mode to realize precision measuring control and intelligent management. The MCU transmits battery sampling voltage and current data to an analog-to-digital converter (ADC) to carry out quantitative analysis; the quantitative data and optimization data prestored in the MCU are compared; and the minimus information is fed back to a switch controlled by an analog front end (AFE) module to precisely control parameters of charge and discharge current, voltage, and the like. The detection mode of the MCU for the charge and discharge current of the batteries adopts the subsection detecting technique, wherein the charge and discharge current of the batteries are converted into digital signals by a voltage-mode converting circuit and a current-mode comparator, and the digital signals are sent to a central processing unit (CPU) in the MCU to carry out analysis and battery control. The invention improves the measuring precision, reduces the cost of design and production of chips and reduces the power consumption of the chips.
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Description

technical field

[0001] The invention belongs to the current measurement and protection of a rechargeable battery or a battery pack, in particular to a lithium battery / battery pack measurement and protection circuit based on current segment detection technology. Background technique

[0002] Rechargeable batteries are reusable batteries, usually lead-acid, nickel-cadmium, nickel-metal hydride, lithium-ion, fuel cells, etc. In recent years, with the wide application of portable products, more and more products use lithium batteries as their main power supply. Lithium batteries have the following characteristics: small size, high energy density, no memory effect, high cycle life, high voltage battery, self- Low discharge rate, environmental protection and no pollution, etc., especially in the power supply of notebook computers, its excellent high energy advantage is brought into full play. However, due to the high energy density and unique chemical characteristics, there are a...

Claims

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