Battery Internal Resistance Testing with Load Isolation

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Solution Overview

Problem

Existing methods for testing the internal resistance of batteries in electronic devices are inaccurate due to the impact of internal loads, which affect the detection results.

Innovation Solution

A method involving a switch to disconnect the load from the battery during testing, ensuring accurate measurement of internal resistance by isolating the load from the battery, and using a charging chip to maintain power to the electronic device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the load is connected to the battery during internal resistance testing, then the electronic device can operate normally, but the detection accuracy of internal resistance deteriorates due to load impact

Engineering Contradiction:

Improveinternal resistance detection accuracyVSAvoiddevice operation continuity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent segments the power supply system by introducing a first switch that can independently control the connection between the battery and the load. This allows the battery to be isolated from the load during internal resistance testing while maintaining the ability to reconnect afterward, thus achieving both accurate measurement and operational continuity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first switch acts as an intermediary component between the battery and the load. It enables controlled disconnection during testing to improve measurement accuracy, while the charging chip serves as another intermediary to maintain power supply to the load from the charger during the testing period, resolving the contradiction between accurate measurement and continuous operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the first switch is integrated inside the battery, then the integration level increases and detection accuracy improves, but the manufacturing complexity increases

Engineering Contradiction:

Improveinternal resistance detection accuracyVSAvoidbattery integration complexity

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent merges the first switch with the battery structure, integrating the switching component directly into the battery assembly. This integration eliminates separate external switching mechanisms and simplifies the overall system architecture while maintaining the ability to accurately isolate the battery during testing.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated first switch within the battery serves multiple functions: it enables accurate internal resistance testing by isolating the battery, maintains normal power supply operation when closed, and works in conjunction with the charging chip to provide flexible power management. This multi-functionality justifies the integration complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12455322B2Method for testing internal resistance of battery, and electronic device

Publication Date: 2025.10.28 HONOR DEVICE CO LTD

AI summary

A method includes: obtaining an in-position status of a charger of the electronic device; turning off a first switch if the charger of the electronic device is in position, where the first switch is located between a load of the electronic device and a battery of the electronic device; and after the load is disconnected from the battery, detecting a change of an internal resistance of the battery to obtain an internal resistance test result.