Battery Pack Tester Using Correction Factors for In-Pack Measurement
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Solution Overview
Problem
Testing individual batteries within a battery pack requires disconnection to ensure accuracy, leading to downtime and potential pack failure if reassembled improperly, and existing methods do not account for the influence of other batteries on test results.
Innovation Solution
A method and apparatus using dynamic parameter measurement circuitry with a correction factor to test batteries within a pack without disconnection, applying a forcing function to measure dynamic parameters and adjusting results based on the pack's configuration and number of batteries, allowing for accurate assessment of battery condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If batteries are disconnected from the battery pack for testing, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent introduces correction factors as an intermediary element that mediates between the measured parameters and the actual battery condition. These correction factors account for the influence of other batteries in the pack, allowing accurate testing without physical disconnection. The measurement circuitry applies these correction factors to compensate for the electrical influence of connected batteries, thus achieving both accuracy and continuity.
2Measurement precision
If batteries are disconnected from the battery pack for testing, then measurement precision is improved, but reliability worsens due to potential improper reassembly
Solution Approach 1:
The correction factors serve as a mathematical intermediary that eliminates the need for physical disconnection. By computing these factors based on the known configuration and parameters of the battery pack, the system can accurately assess individual battery conditions while maintaining all batteries connected, thus preserving assembly integrity.
3Device complexity
If traditional testing methods are used without correction factors, then device complexity is reduced, but measurement precision deteriorates due to influence of other batteries
Solution Approach 1:
The patent changes the parameters of the measurement system by introducing correction factors that transform raw measured values into accurate battery condition indicators. These correction factors are computed based on the battery pack configuration and the measured parameters of all batteries, effectively compensating for the electrical influence of connected batteries and enabling precise measurement without increasing hardware complexity.
4Productivity
If batteries remain connected during testing, then productivity is improved and downtime is reduced, but measurement precision deteriorates without correction factors
Solution Approach 1:
The correction factors act as a computational intermediary that enables accurate battery testing while batteries remain connected in the pack. This intermediary computation layer processes the measured parameters and compensates for the electrical influence of other batteries, allowing maintenance operations to proceed without disconnection while maintaining measurement accuracy.
Data Source
AI summary
An apparatus and method for testing a battery pack are provided. Measurement circuitry is configured to measure parameters of batteries within the battery pack. The measurement circuitry responsively provides an output indicative of a condition of a battery in the battery pack. The output is based upon a measured parameter of the battery pack and a correction factor.