Battery Balancing Detection Using Negative Pulses Under Load
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Solution Overview
Problem
Existing battery balancing detection methods have low accuracy due to voltage differences caused by direct current resistance (DCR) when the power battery system is providing electric energy, leading to inconsistent battery pack performance and reduced service life.
Innovation Solution
A battery balancing detection method involving negative pulse discharging to determine the unbalancing degree based on electrical parameters of battery cells after discharging, avoiding detection errors from DCR and improving accuracy across various operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If voltage difference method is used to detect battery unbalancing degree during power provision, then detection can be performed in real-time operation, but detection accuracy deteriorates due to DCR-induced voltage differences
Solution Approach 1:
The patent applies periodic pulse discharge actions at predetermined intervals during battery operation. The control unit performs pulse discharge on specific battery cells at predetermined time points, then measures the voltage change during the pulse to calculate unbalancing degree. This periodic measurement approach enables real-time monitoring while avoiding continuous current flow that would cause DCR interference, thus resolving the contradiction between real-time detection capability and measurement accuracy.
2Duration of action of moving object
If battery balancing detection is performed during current provision, then operational continuity is maintained, but detection accuracy deteriorates due to DCR effects
Solution Approach 1:
The patent implements preliminary pulse discharge actions at predetermined intervals before significant unbalancing occurs. The control unit proactively performs pulse discharge and measurement sequences at scheduled times during battery operation, rather than waiting for abnormal conditions. This preliminary periodic measurement ensures continuous monitoring capability while maintaining accuracy by performing measurements during controlled pulse conditions rather than during sustained high-current operation where DCR effects dominate.
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 method enhances the accuracy of battery balancing detection, enabling better utilization of battery capacity, increasing power levels, and extending battery service life by accurately determining the unbalancing degree and facilitating timely balancing operations.
Implementation Method 1
performing negative pulse discharging on a battery in response to a battery balancing detection instruction
Data Source
AI summary
A battery balancing detection method, apparatus, an electronic device, and a storage medium, wherein the method comprises: performing negative pulse discharging on a battery in response to a battery balancing detection instruction; and determining an unbalancing degree of the battery based on electrical parameters of battery cells in the battery after discharging. The method can avoid detection errors brought about by DCR when detecting the unbalancing degree in the case where current exists when the power battery system is providing electric energy, and can take into account the detection of the unbalancing degree of the battery while detecting the SOH of the battery by means of negative pulses, which is conducive to the improvement of the energy utilization rate and the service life of the battery.