Multi-Branch Coolant Leak Detection and Isolation for Battery Modules
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Solution Overview
Problem
Existing rechargeable energy storage systems face challenges in effectively detecting and mitigating coolant leaks, which can lead to thermal runaway events due to inadequate thermal management, potentially affecting the entire battery array.
Innovation Solution
A coolant leak detection and mitigation system for a multi-cell rechargeable energy storage system (RESS) featuring a main coolant loop with parallel branches, flow-valves, and an electronic controller that monitors coolant loss, identifies leaks, and shuts off coolant flow to affected branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant flow is continuously monitored in all branches to detect leaks early, then detection reliability is improved, but device complexity increases due to multiple sensors and control mechanisms
Solution Approach 1:
The cooling system is divided into multiple independent coolant branches, each with its own flow valve. This segmentation allows the system to monitor and control each branch separately, improving leak detection reliability without requiring complex centralized monitoring of the entire system.
Solution Approach 2:
The electronic controller continuously monitors coolant flow in each branch and receives feedback from flow valves. When a leak is detected in one branch, the controller adjusts the flow valves to maintain proper coolant distribution in other branches, ensuring reliable operation despite the complexity of multiple sensors.
2Manufacturing precision
If flow valves are used to regulate coolant distribution in parallel branches, then temperature control precision is improved, but device complexity increases due to additional control components
Solution Approach 1:
The flow valves are designed to dynamically adjust coolant flow based on real-time temperature and flow conditions in each branch. This dynamic control allows precise temperature regulation for each battery module while the valves self-regulate based on system conditions, reducing the need for overly complex control mechanisms.
Solution Approach 2:
The system changes flow parameters (coolant flow rate) in each branch independently through the flow valves to achieve precise temperature control. By adjusting flow parameters rather than using complex mechanical or structural modifications, the system achieves precision with relatively simple valve components.
3Reliability
If the system shuts off coolant flow to isolated branches during leaks, then thermal runaway prevention is improved, but heat dissipation capability deteriorates in affected branches
Solution Approach 1:
When a leak is detected in a specific coolant branch, the system extracts or isolates that problematic branch from the coolant circulation by closing its flow valve. This prevents the leak from causing thermal runaway while the rest of the system continues to operate normally with full heat dissipation capability.
Solution Approach 2:
The system takes preliminary action by detecting coolant leaks early and shutting off flow to affected branches before thermal runaway can occur. This preventive measure stops the harmful thermal progression in its tracks, and the system can later restore flow to the branch after repair without permanent loss of heat dissipation capability.
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
Effectively detects and mitigates coolant leaks by isolating the affected branches, preventing thermal runaway and maintaining system performance.
Implementation Method 1
Devices such as heat-sinks or cold-plates with circulating coolant are employed to remove heat from battery systems
Implementation Method 2
cold-plates with circulating coolant are employed to remove heat from battery systems
Data Source
AI summary
A coolant leak detection and mitigation system for a rechargeable energy storage system having multiple battery cells arranged in individual battery modules includes a cooling system having a main coolant loop and multiple parallel coolant branches. Each coolant branch adjusts the temperature of one battery module using a portion of coolant from the main coolant loop. The cooling system also has flow-valve(s) for regulating and distributing the coolant from the main coolant loop across the coolant branches. An electronic controller is configured to monitor the cooling system for coolant loss and, in response to an indication of coolant loss, assess each coolant branch for a coolant leak. The controller is also configured to identify a coolant branch having a coolant leak and shut off, via the flow-valve(s), coolant flow into the coolant branch having the coolant leak.