Battery Cell Voltage Measurement Using Internal Resistance Correction
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Solution Overview
Problem
Existing battery management systems face errors in voltage measurement due to internal resistance, particularly affecting cells at opposite ends of a battery module, requiring a separate apparatus for correction.
Innovation Solution
A battery management apparatus and method that calculates and corrects voltage errors by using multiple power sources to measure and account for internal resistance, eliminating the need for a separate correction apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate voltage measuring apparatus is used to correct voltage errors, then voltage measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the voltage measurement function and the error correction function into a single integrated system. The controller performs both the initial voltage measurement and the subsequent correction calculation using multiple power source measurements, eliminating the need for a separate correction apparatus while maintaining high measurement precision
Solution Approach 2:
The controller is designed to perform multiple functions: it measures voltage using the first power source, measures voltage again using the second power source, calculates the internal resistance based on both measurements, and corrects the voltage error. This multi-functional approach replaces what would traditionally require separate dedicated apparatus
2Measurement precision
If multiple power sources are used to measure and correct voltage errors, then voltage measurement precision is improved, but device complexity remains simple
Solution Approach 1:
The system uses its own existing components (the controller and multiple power sources already present in the battery management system) to perform the correction function. The controller leverages the multiple power sources it already manages to measure and correct voltage errors, making the system self-sufficient without requiring external correction apparatus
3Device complexity
If voltage measurement is performed without correction for internal resistance, then device complexity is simple, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary measurements using multiple power sources before finalizing the voltage value. By measuring voltage with different power sources and calculating the internal resistance in advance, the system prepares the correction data needed to achieve precise voltage measurement without requiring complex additional apparatus
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
Automatically corrects voltage measurement errors caused by internal resistance without requiring a separate apparatus, ensuring accurate voltage measurement across all battery cells.
Implementation Method 1
a voltage error may occur for battery cells provided at opposite ends of a battery module due to a voltage drop caused by a current required for driving of the BMIC circuit and an internal resistance of a battery cell
Data Source
AI summary
A battery management apparatus according to an embodiment disclosed herein includes a power source unit including a plurality of power sources, a measurement unit configured to measure a first voltage by applying a first power source among the plurality of power sources to a battery cell and to measure a second voltage by applying a second power source among the plurality of power sources to the battery cell, and a calculating unit configured to calculate a voltage of the battery cell based on the first voltage and the second voltage.