Semiconductor IC Battery Control Circuit with Pre-calculated Resistance Coefficients

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Solution Overview

Problem

Existing semiconductor integrated circuits for battery control in portable equipment, such as notebook PCs, face challenges in accurately calculating the full charge capacity Qmax and internal resistance of batteries, leading to prolonged calculation times and inaccurate remaining capacity estimation.

Innovation Solution

A semiconductor integrated circuit equipped with a memory function, current integrating function, voltage-based and current-based state of charge operating functions, comparison determination function, correcting function, and resistance deterioration coefficient output function, which stores and updates the relationship between full charge capacity and internal resistance deterioration coefficients, allowing for coincident voltage-based and current-based state of charge calculations to enhance calculation efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If conventional battery control methods are used to calculate full charge capacity and internal resistance, then calculation accuracy is maintained, but calculation time is prolonged

Engineering Contradiction:

Improvecalculation timeVSAvoidcalculation accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent pre-calculates and stores the relationship between full charge capacity and internal resistance deterioration coefficients in a table during the battery's initial state. This preliminary action eliminates the need for time-consuming real-time calculations during battery operation, while maintaining accuracy by using pre-validated data relationships.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent performs preliminary determination of voltage-based and current-based state of charge coincidence points before actual battery usage. By pre-identifying when these two measurement methods converge, the system establishes reference values that enable rapid subsequent calculations without sacrificing precision.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If conventional battery control methods are used, then comprehensive battery parameters are calculated, but remaining capacity estimation accuracy is reduced

Engineering Contradiction:

Improveremaining capacity estimation accuracyVSAvoidcalculation efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent extracts and utilizes only the critical relationship between full charge capacity and internal resistance deterioration coefficients from the complete set of battery parameters. By focusing on this specific relationship and storing it in advance, the system achieves high remaining capacity estimation accuracy while improving calculation efficiency through selective parameter usage.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs feedback by continuously monitoring the coincidence of voltage-based and current-based state of charge values. When these values converge, the system uses this feedback signal to confirm accurate full charge capacity determination, thereby improving remaining capacity estimation without requiring exhaustive calculation of all battery parameters.

Inventive Principle:

Principle #23Feedback

3Reliability

If detailed battery parameter calculations are performed, then comprehensive battery health assessment is achieved, but calculation complexity increases

Engineering Contradiction:

Improvebattery health assessment reliabilityVSAvoidcalculation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the essential relationship between full charge capacity and internal resistance deterioration coefficients from the complex set of battery parameters. By isolating and pre-storing this critical relationship, the system maintains reliable battery health assessment while significantly reducing calculation complexity during operation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary analysis to determine the coincidence points of voltage-based and current-based state of charge measurements. This preliminary action establishes reliable reference data that simplifies subsequent battery health assessments, maintaining reliability while reducing the complexity of real-time calculations.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8970174B2Semiconductor integrated circuit having battery control function and operation method thereof

Publication Date: 2015.03.03 RENESAS ELECTRONICS CORP

AI summary

A semiconductor integrated circuit is capable of being supplied with battery current information and battery voltage information. The semiconductor integrated circuit includes a memory function, a current integrating function, a voltage-based state of charge operating function, a current-based state of charge operating function, a comparison determination function, a correcting function, and a resistance deterioration coefficient output function. The memory function stores the relation between a state of charge of a battery and an internal resistance deterioration coefficient thereof. The full charge capacity outputted from the correcting function and the internal resistance deterioration coefficient outputted from the resistance deterioration coefficient output function are stored in the memory function when a voltage-based state of charge and a current-based state of charge compared by the comparison determination function are determined to substantially coincide with each other.