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Charging of li-ion batteries

A battery charging and battery pack technology, applied in battery circuit devices, battery data exchange, data exchange chargers, etc., can solve problems such as damage to charger battery packs, increased costs, and potential safety hazards

Inactive Publication Date: 2014-03-12
THE GILLETTE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current sensing adds significantly to cost, for example, requiring the use of current sensing precision shunt resistors and operational amplifiers to amplify low voltage signals, as conventionally used
[0002] One factor limiting the convenience of charging rechargeable battery packs is the risk of overheating of the charger and / or battery pack
Such overheating can damage the charger and / or battery pack and can pose a safety hazard

Method used

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  • Charging of li-ion batteries
  • Charging of li-ion batteries
  • Charging of li-ion batteries

Examples

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Embodiment Construction

[0024] An electrochemical cell can be a primary battery or a secondary battery. Primary electrochemical cells are meant to be discharged (eg to exhaustion) only once and then discarded. The primary battery is not intended to be recharged. Primary batteries are described, for example, in David Linden's Handbook of Batteries (McGraw-Hill, 2nd ed., 1995). On the other hand, secondary electrochemical cells, hereinafter also referred to as rechargeable cells or batteries, can be recharged many times, eg, fifty times, one hundred times, etc. Secondary batteries are described, for example, in "Alkaline Storage Batteries" by Falk & Salkind, (John Wiley & Sons, Inc. 1969); US Patent No. 345,124; and French Patent No. 164,681, all of which are incorporated by reference.

[0025] see figure 1 , which shows a charger 10 configured to charge a rechargeable battery pack 12 having at least one rechargeable electrochemical cell based on lithium iron phosphate chemistry. Such batteries, so...

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Abstract

Techniques for charging a rechargeable battery having at least one rechargeable cell are described. A battery charger applies a constant current to charge the rechargeable cell and periodically measures a value of voltage of the rechargeable cell. The value of voltage is tracked over a time period required to charge the rechargeable cell to have the measured value of voltage be substantially equal to a crossover value of voltage for the rechargeable cell. A constant voltage is applied substantially equal to the crossover voltage for a second period of time, with the second period of time selected based on the tracked time period. The charging is terminated after the second period of charging time has elapsed.

Description

Background technique [0001] Li-ion battery packs are generally charged by a combined constant current and constant voltage technique. The battery pack is first charged with a constant current until the battery pack voltage reaches a set voltage value commonly referred to as the alternating voltage. After reaching this voltage, the charger maintains a constant charging voltage as the current tapers off. The charger will keep charging until the termination current value is reached (typically a current corresponding to 5-10% of the CC rated current). Typically, chargers require the charging circuit to maintain tight tolerances for voltage and current regulation. To support this type of charging, current sensing circuits are typically used. However, current sensing adds significantly to cost, eg, requires the use of current sensing precision shunt resistors and operational amplifiers to amplify low voltage signals, as is conventionally used. [0002] One factor that limits the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0004H02J7/0072H02J7/045H02J7/00036H02J7/00047H02J7/04H02J7/00714H02J7/0071H02J7/007182H02J7/00711
Inventor 胡冉E·德沃尔金R·J·帕夫林斯基
Owner THE GILLETTE CO