Battery Voltage Regulation via Switch-On Probability
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Solution Overview
Problem
Existing battery systems require significant communication effort to achieve fine voltage graduation, leading to increased switching losses and complexity, especially when reducing the number of battery modules or cells.
Innovation Solution
A method where a nominal switch-on probability is transmitted to all battery cells via a central drive signal, allowing them to be switched with a predetermined probability, reducing communication effort and switching losses, and using quality factors to adapt switch-on probabilities based on cell state parameters for efficient voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual battery cells are addressed and switched in real time to achieve fine voltage graduation, then voltage regulation precision is improved, but communication effort and system complexity increase significantly
Solution Approach 1:
The patent segments the battery management task by dividing battery cells into groups that share common characteristics (state of charge, temperature, aging). Instead of individually managing each cell, the system manages groups collectively, reducing communication overhead while maintaining adequate voltage regulation precision through group-level control strategies.
Solution Approach 2:
The patent implements self-service by enabling battery cells to autonomously determine their switching states based on pre-configured control rules and local sensor data. Each cell or group of cells can independently decide when to switch without requiring real-time central controller intervention, thereby reducing communication effort while maintaining regulation precision through decentralized autonomous decision-making.
2Measurement precision
If the number of battery modules or cells is reduced to achieve fine voltage graduation, then voltage resolution is improved, but switching losses increase due to more frequent switching operations
Solution Approach 1:
The patent applies periodic action by implementing duty-cycle control where battery cells are switched on and off in periodic patterns rather than continuously. This allows the system to achieve fine voltage graduation through controlled duty cycles while minimizing switching frequency and associated losses. The periodic switching enables precise voltage regulation over time without requiring high-frequency continuous switching.
3Speed
If real-time switching control is implemented for all battery cells, then voltage regulation response time is improved, but communication bandwidth requirements and system complexity increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring control rules, thresholds, and parameters for battery cell switching before operation begins. These pre-established control strategies enable cells to rapidly respond to voltage regulation needs using locally stored instructions, eliminating the need for real-time communication during critical switching decisions and reducing both response time and communication infrastructure requirements.
Data Source
AI summary
A method for regulating a battery voltage of a battery having a plurality of battery cells configured to be selectively bridged and connected to a battery string includes regulating the battery voltage to a desired nominal voltage by alternately driving the battery cells. The method further includes transmitting a value for a nominal switch-on probability to one or more driving circuits of the battery cells, with the result that the one or more battery cells are each switched with an allocated switch-on probability.