Parallel Battery Power Allocation via Dynamic Selection
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Solution Overview
Problem
Existing energy storage and recovery systems face limitations in managing power requests due to uncontrolled battery usage, where only overall power can be distributed based on internal impedance, leading to premature battery exhaustion and unavailability, and previous architectures fail to consider overall system availability when allocating power requests.
Innovation Solution
A method for allocating a power request to a plurality of batteries connected in parallel by determining an optimized combination of batteries that maximizes the number of batteries used, allocating power levels based on minimum and maximum power capabilities, and prioritizing batteries to maintain system availability and prevent premature exhaustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If batteries are connected in parallel with direct control, then the system can respond to power requests, but the oldest battery limits the exploitable power and system availability decreases
Solution Approach 1:
The patent segments the battery system into individually controllable units, each with its own controller. This allows independent management of each battery's charge/discharge cycles, preventing any single battery from limiting the overall system power capability while maintaining system availability through selective activation of available batteries.
Solution Approach 2:
The system dynamically selects and activates batteries based on real-time conditions such as state of charge, age, and current demand. The controller adjusts which batteries are active and their individual power contributions, optimizing the balance between exploitable power and system availability rather than using a fixed allocation scheme.
2Power
If all batteries are used to meet power requests, then the power request is satisfied, but battery exhaustion occurs prematurely and system availability decreases
Solution Approach 1:
The system monitors and adjusts operating parameters for each battery including state of charge limits, current thresholds, and power contribution levels. By dynamically changing these parameters based on battery condition, the system satisfies power requests while preventing premature exhaustion and extending overall system operational life.
Solution Approach 2:
Each battery is equipped with a controller that provides feedback on its state of charge, health, and operational status. The central system uses this feedback to adjust power allocation in real-time, reducing demand on batteries approaching exhaustion thresholds and redistributing load to maintain both power satisfaction and extended operational duration.
3Device complexity
If only overall power is controlled without individual battery management, then the system architecture is simple, but the full possibilities of individual batteries cannot be exploited
Solution Approach 1:
The system implements segmentation by providing individual controllers for each battery while maintaining a unified control architecture. This modular approach enables full exploitation of individual battery capabilities through independent monitoring and control, without requiring proportionally complex system-wide management for each battery parameter.
Data Source
Figure 1~2
AI summary
The invention relates to a method and a system for allocating a power request PREQ to a plurality of batteries (M1,...MN) connected in parallel in an electrical energy storage system. According to the invention, the allocation system comprises a global control system (6) that can determine a combination of batteries from said plurality of batteries (M1,...MN), which is optimised to respond to the power request using the highest possible number of batteries; and allocate a power level to each of the batteries of said optimised combination.