Battery Charging Control via Temperature and Charge Thresholds

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Solution Overview

Problem

Existing battery chargers for communication devices do not efficiently charge rechargeable batteries due to temperature variations caused by factors like battery impedance, external mass changes, and energy delivery, leading to false temperature determinations and premature termination of charging before the battery reaches its full potential.

Innovation Solution

A method and apparatus using an internal fuel gauge and temperature sensor to monitor battery temperature and charging status, discontinuing charging when the temperature exceeds a threshold until it falls within a safe range, ensuring the battery is fully charged by regulating the power supply through a microcontroller.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If temperature-based charging termination is used, then charging safety is improved, but charging completeness deteriorates due to false temperature determinations

Engineering Contradiction:
Improvecharging safetyVSAvoidcharging completeness
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent introduces an intermediary mechanism that decouples temperature monitoring from charging termination decisions. A temperature sensor continuously monitors battery temperature, but the charging termination is determined by charge status thresholds rather than temperature thresholds. The temperature data serves as a safety constraint that modifies charging parameters, not as the primary termination criterion. This intermediary approach allows charging to continue beyond what traditional temperature-based systems would terminate, achieving full charging while maintaining safety through separate temperature management.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent inverts the traditional charging control logic by making charge status the primary termination criterion rather than temperature. Instead of terminating charging when temperature reaches a threshold (which causes premature termination), the system terminates charging when charge status reaches a threshold, while using temperature data to adjust charging rates and ensure safety. This inversion resolves the contradiction by prioritizing charging completeness while maintaining safety through reversed control logic.

Inventive Principle:
Principle #13The other way round (Inversion)

2Productivity

If aggressive charging is applied, then charging speed is improved, but temperature control deteriorates leading to false temperature readings

Engineering Contradiction:
Improvecharging speedVSAvoidtemperature measurement accuracy
Core Design Contradiction:
ProductivityVSMeasurement precision

Solution Approach 1:

The patent implements dynamic charging parameters that adjust based on real-time charge status and temperature conditions. The charging current and voltage are dynamically modified according to the battery's state, allowing aggressive charging when appropriate while reducing intensity when temperature concerns arise. This dynamic approach enables high charging speeds without causing excessive temperature rises that would lead to false temperature readings and premature termination.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the control parameter from temperature threshold to charge status threshold, fundamentally altering how charging intensity is regulated. By using charge status as the primary parameter and temperature as a secondary constraint, the system can maintain aggressive charging parameters longer without triggering false temperature-based termination. This parameter change allows the system to achieve faster charging while maintaining accurate temperature monitoring for safety purposes.

Inventive Principle:
Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach ensures the battery is charged to its full potential, regardless of temperature variations, by accurately determining the charging status and safely managing temperature fluctuations, thereby maximizing battery life and power output.

Implementation Method 1

sensing temperature of the battery while charging the battery

Methodology Applied
Scientific EffectTemperature sensing:

Implementation Method 2

determining that a charge status, which indicates an amount of charge in the battery, is monitored

Methodology Applied
Scientific EffectCharge level detection:

Data Source

PatentUS8129983B2Method and apparatus for controlling charging of a battery in a communication device
Publication Date: 2012.03.06 MOTOROLA SOLUTIONS INC
  • US8129983B2 patent drawing
  • US8129983B2 patent drawing
  • US8129983B2 patent drawing

AI summary

The application discloses a method and apparatus for controlling the charging of a battery in a communication device. The method includes sensing temperature of the battery while charging the battery, and determining that the temperature is greater than a predetermined temperature threshold value. The method then includes monitoring a charging status of the battery when the determined temperature is greater than the predetermined temperature threshold value. The charging status indicates an amount of charge in the battery. The method further includes determining that the amount of charge in the battery is less than a predetermined charge threshold value. The method then includes suspending charging of the battery, until the temperature falls below the predetermined temperature threshold value, when the determined amount of charge in the battery is less than the predetermined charge threshold value.