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Deep under voltage recovery in a battery pack

A high-voltage and low-voltage technology, applied in battery circuit devices, current collectors, electric vehicles, etc.

Active Publication Date: 2012-10-10
ATMEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One such limitation involves charging the cells when their cell voltage falls below a certain level, which is commonly referred to as a deep undervoltage (DUV) condition

Method used

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  • Deep under voltage recovery in a battery pack
  • Deep under voltage recovery in a battery pack
  • Deep under voltage recovery in a battery pack

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Embodiment Construction

[0032] Reference will be made to a single-chip battery management system in which a microcontroller, non-volatile memory, and other circuit components are integrated into a single integrated circuit. Alternatively, the proposed method and system can be implemented in a multi-chip solution. The disclosed methods and systems can be implemented in these and other architectures as will occur to those skilled in the art. A method, apparatus, and system are described for deep brown-out recovery (i.e., very low cell voltages) that takes steps to ensure proper power is supplied to battery management system circuit elements (e.g., to battery management system provide appropriate power so that monitoring functions can be enabled) while similarly ensuring that associated chargers are properly configured to charge the system's cells (including during deep brownout recovery).

[0033] Battery pack including battery management system

[0034] now refer to Figure 1A , which shows the batt...

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PUM

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Abstract

In one implementation, a method for charging a battery system is provided. The method includes enabling determining if a charger is coupled to a battery system, the battery system including one or more cells and a charge enable transistor. The method also includes enabling determining if a voltage level of the cells is less than a predetermined first low voltage level. If the voltage level of thecells is less than the predetermined first low voltage level, enabling charging of the cells at a reduced rate including adjusting a voltage applied to the charge transistor gate terminal to regulatea voltage seen by the charger to a level that is less than a predetermined second voltage level. Additionally, when the voltage of the cells reaches the predetermined first low voltage level, the method includes substantially fully enabling the charge transistor to allow for charging at full rate by the charger.

Description

technical field [0001] The present invention relates to circuits. Background technique [0002] Many modern portable devices (eg, laptop computers, mobile phones, digital cameras, video cameras, media players, personal digital assistants (PDAs), gaming consoles, etc.) include battery packs. One particular type of conventional battery pack includes one or more battery cells coupled to one or more integrated circuit (IC) chips. The chip typically includes a controller (eg, microcontroller) and circuitry and provides, among other things, battery cell management and protection. [0003] Some conventional battery packs include Lithium ion cells, which are essentially volatile chemical reactions encapsulated within cylinders. Potential energy is stored in each cell, and if the cell is exposed to conditions outside its specifications, the cell can overheat, catch fire, or explode. Conventional battery packs configured with these volatile cells typically include protection termin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/04
CPCH02J7/0036H02J7/0075H02J7/0029H02J7/0069H02J7/04
Inventor 佐藤秀幸居纳尔·甘斯托阿尔内·阿斯波尔·龙尼·卡斯特内斯
Owner ATMEL CORP