Battery Bypass Circuit for Series Cell Fault Management
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Solution Overview
Problem
Battery systems face issues with maintaining operation when one or more battery cells enter a fault state, leading to open-circuit conditions and overheating, which can cause the system to stop producing the desired voltage output.
Innovation Solution
A battery system with a bypass circuit that determines when a battery cell's voltage output falls below a threshold, allowing it to bypass that cell in the series circuit and a conditioned air system for cooling, ensuring the system continues to operate within tolerances and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery cells are connected in a series circuit to provide total voltage output, then the voltage output is improved, but the reliability deteriorates because one faulty cell causes open-circuit condition
Solution Approach 1:
The battery system is segmented into multiple parallel bypass circuits, each associated with a specific battery cell. Each bypass circuit can independently activate to bypass its corresponding cell, allowing the system to maintain operation by rerouting current through alternative paths when individual cells fail.
Solution Approach 2:
Bypass circuits act as intermediary pathways between battery cells in series. When a cell fails, the bypass circuit provides an alternative conductive path that mediates the current flow, preventing the open-circuit condition from propagating through the entire series circuit.
2Productivity
If battery cells operate at high current to maintain power output, then the productivity is improved, but the temperature increases causing overheating
Solution Approach 1:
The system dynamically adjusts current distribution among battery cells based on real-time temperature monitoring. When certain cells overheat, the control system redistributes current to cooler cells, allowing the system to maintain overall power output while managing thermal conditions through adaptive current modulation.
Solution Approach 2:
The system changes operational parameters by monitoring cell temperatures and adjusting current allocation accordingly. This parameter change approach allows maintaining high productivity by redistributing electrical load from overheated cells to cooler cells, thus managing temperature while sustaining power output.
3Reliability
If all battery cells are monitored and controlled individually, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The monitoring and control system is segmented into independent bypass circuits, each dedicated to a specific battery cell. This segmentation allows individual cell monitoring and control without requiring a centralized complex control system, as each bypass circuit operates semi-independently to detect and respond to cell failures.
Solution Approach 2:
Each bypass circuit is designed to automatically detect faults in its associated battery cell and activate the bypass path without requiring complex external control. This self-service capability reduces overall system complexity by distributing the intelligence and control functions to individual cell-level circuits.
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
The system maintains functionality by bypassing underperforming cells and effectively cooling the battery cells, preventing open-circuit conditions and overheating, thus ensuring continuous operation and extended battery life.
Implementation Method 1
The conditioned air creates a positive pressure inside the battery chamber that causes the fluid to flow from the battery chamber to the environment outside of the housing
Implementation Method 2
The bypass circuit is configured to bypass the battery cell in the series circuit in response to a determination that the voltage output from the battery cell has fallen below the selected threshold
Data Source
AI summary
A method and apparatus for operating a battery system. The apparatus comprises a housing, a plurality of battery cells, and a bypass circuit. The plurality of battery cells is connected in a series circuit within the housing. The plurality of battery cells is configured to supply a total voltage output. The bypass circuit is configured to determine whether a voltage output from a battery cell in the plurality of battery cells has fallen below a selected threshold. The bypass circuit is further configured to bypass the battery cell in the series circuit in response to a determination that the voltage output from the battery cell has fallen below the selected threshold.