Battery Balance Circuit with Dynamic Enable Control
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Solution Overview
Problem
Conventional battery balance circuits have a poor balance effect due to short operating times and interference from noises and offset voltages, leading to unbalanced electric power storage capacity and reduced efficiency in battery modules.
Innovation Solution
A battery balance circuit that determines the end time of the voltage balance process by detecting fully charged or varying battery voltages, comprising a balance circuit, protection circuit, charge judgment circuit, and balance enable circuit, which activates and deactivates the balance process based on battery states to prolong the balance process and achieve better voltage balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the charge judgment circuit determines charge state based on voltage drop across charge/discharge switch during charging, then the circuit can detect charge state, but the detectable threshold must be sufficiently large to overcome noises and offset voltages, resulting in short operating time for voltage balance process
Solution Approach 1:
The patent introduces a balance enable circuit as an intermediary between the charge judgment circuit and the balance circuit. This enable circuit generates a balance enable signal that extends the activation period of the balance circuit beyond what the charge judgment circuit alone would provide. The enable circuit acts as a mediator that decouples the balance circuit activation from the strict charge state detection threshold, allowing the balance process to run for a longer duration while maintaining measurement accuracy through the original charge judgment mechanism.
2Loss of energy
If the voltage balance process operates for a short period due to low charge current below detectable threshold, then energy consumption is reduced, but the balance effect becomes unobvious and voltage differences between battery cells are not effectively reduced
Solution Approach 1:
The patent implements dynamic control of the balance circuit through the balance enable circuit. The balance enable signal dynamically extends the operation period of the balance circuit based on system state rather than using a fixed threshold-based activation. This dynamic approach allows the balance process to continue operating during phases when charge current would otherwise drop below the detectable threshold, maintaining voltage balance precision without excessive energy consumption, as the extended operation is strategically timed to when it is most beneficial.
3Adaptability or versatility
If batteries in a battery module have different electric power storage capacities and self-discharge rates, then each battery has its own characteristics, but unbalanced electric power storage capacity occurs among batteries, reducing usable capacity and operation time of the battery module
Solution Approach 1:
The patent implements a feedback mechanism where the balance circuit continuously monitors voltage differences between battery cells and actively adjusts to reduce these differences. The balance enable circuit provides feedback control by extending the balance operation period based on the need to equalize cell voltages. This feedback loop ensures that despite individual battery variations in capacity and self-discharge rate, the overall module maintains balanced operation, maximizing both compatibility and operational time by preventing the weakest cell from limiting the entire module's performance.
Data Source
AI summary
A battery balance circuit is adapted to balance battery voltages among a plurality of battery cells. The battery balance circuit is enabled to perform a battery balance process when the battery cells are charged, and is disabled when one of the batter cells is fully charged or the battery cells are un-charged.