Electrochemical Energy Accumulator Cell Switching Control
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Solution Overview
Problem
Existing electrochemical energy accumulators face inefficiencies in cell state balancing, leading to high switching losses and prolonged balancing times due to the use of multiple independent probability functions for managing cell states.
Innovation Solution
A two-step process involving the generation of a single probability distribution curve for voltage adaptation and the use of a mathematical function to calculate cell voltage corrections based on charging states, with defined state of charge threshold values to optimize cell switching and minimize switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent probability functions are used for managing cell states, then cell state balancing can be achieved, but switching losses increase and balancing time is prolonged
Solution Approach 1:
The patent combines multiple independent probability functions into a single unified probability function that manages cell states. This merging reduces the number of switching operations from multiple independent functions to a coordinated single function, thereby reducing switching losses while maintaining effective cell state balancing.
Solution Approach 2:
The unified probability function serves multiple purposes: it manages cell state balancing, determines switching operations, and adapts to different operating conditions. This multi-functional approach replaces the need for multiple specialized probability functions, reducing overall system complexity and switching losses.
2Reliability
If multiple independent probability functions are used for managing cell states, then cell state balancing can be achieved, but balancing time is prolonged
Solution Approach 1:
By merging multiple independent probability functions into a single unified function, the patent reduces the computational overhead and coordination time required for cell state balancing. The unified function processes cell states in a coordinated manner, accelerating the balancing process while maintaining effectiveness.
Solution Approach 2:
The unified probability function pre-calculates switching decisions based on current cell states and operating conditions, allowing for faster execution of balancing operations. This preliminary preparation of switching strategies reduces the time required for actual cell state balancing.
3Ease of operation
If cells are switched on using the upper portion of the half-bridge and switched off using the lower portion, then normal operation is achieved, but switching losses occur during state changes
Solution Approach 1:
The patent implements dynamic switching strategies where the unified probability function continuously adapts switching decisions based on real-time cell states and operating conditions. This dynamic approach optimizes the timing and sequence of switching operations, reducing unnecessary switching events and associated energy losses while maintaining normal operation.
Solution Approach 2:
The unified probability function changes operational parameters such as switching thresholds and probability values based on cell states and operating conditions. By dynamically adjusting these parameters, the system minimizes switching losses during state changes while preserving ease of operation during normal conditions.
Data Source
AI summary
The invention relates to an electrochemical energy accumulator and to a method for switching cells of an electrochemical energy accumulator. According to the invention, the following steps are carried out: a first desired value of an output voltage of the energy accumulator is determined, a first probability for switching a first cell is determined, said first probability predefining connection and/or disconnection of the first cell to or from the electromechanical energy accumulator, a first common state of charge threshold value being defined for all cells of the electrochemical energy accumulator in accordance with the first desired value, and the first cell is disconnected independently from the first probability value as long as the charge state lies below the charge state threshold value.