Battery Cell Rapid Discharge for Thermal Runaway Containment
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Solution Overview
Problem
Electric vehicle battery packs face challenges in mitigating the propagation of thermal events, which can lead to thermal runaway, reducing the longevity and durability of battery cells and potentially causing damage to the entire pack.
Innovation Solution
A system and method that rapidly discharge electrical potential from a battery cell experiencing a thermal event, using sensing circuitry to detect conditions such as temperature, pressure, and voltage, and a control engine to isolate and discharge energy, thereby preventing heat propagation to adjacent cells, with high temperature barricades to inhibit heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery cell experiences thermal runaway, then heat propagates to adjacent cells causing multi-cell thermal runaway, but rapid discharge systems add device complexity
Solution Approach 1:
The battery pack is divided into individual cell-level monitoring and control units. Each cell has its own sensing circuitry and is independently controllable, allowing isolated management of thermal events without affecting the entire pack. This segmentation enables targeted rapid discharge of only the problematic cell rather than requiring complex pack-level intervention systems.
Solution Approach 2:
The system continuously monitors cell conditions (temperature, voltage, current) and identifies thermal runaway onset before full propagation occurs. By detecting early signs and immediately initiating rapid discharge at the first sign of thermal event, the system prevents heat propagation to adjacent cells, acting preemptively rather than reactively.
2Speed
If traditional temperature regulation systems are used, then overheating is managed slowly, but thermal propagation can occur before mitigation takes effect
Solution Approach 1:
Instead of gradually cooling the battery cell through conventional thermal management, the system rapidly discharges the cell's electrical energy through a controlled short circuit or resistive load. This abrupt energy removal causes rapid temperature drop by converting thermal energy to electrical work, skipping the slow passive cooling process and directly addressing the thermal runaway before propagation occurs.
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 mitigates the risk of thermal runaway propagation, enhancing the longevity and durability of battery cells by quickly addressing overheating issues and preventing chain reactions within the battery pack.
Implementation Method 1
battery cells, which act as galvanic cells when being discharged by converting chemical energy to electrical energy
Implementation Method 2
these battery cells can generate heat in use
Implementation Method 3
a single battery cell can overheat to the point of a thermal runaway
Data Source
AI summary
An electric vehicle battery pack configured to rapidly discharge one or more individual battery cells within a multi-cell battery arrangement to mitigate a propagation of a multi-cell thermal runaway event, the vehicle battery pack including a plurality of battery cells and a battery management system including sensing circuitry configured to sense one or more conditions of the plurality of battery cells, a processor configured to process data sensed by the sensing circuitry to determine whether any of the plurality of battery cells is experiencing the onset of a thermal runaway event, and a control engine configured to isolate and rapidly discharge a potential energy from a battery cell experiencing the onset of a thermal runaway event, thereby mitigating a potential for a propagation of a thermal runaway event experienced by a single cell into a multi-cell thermal runaway event.