Battery Module Lead Plate for Solid Exhaust Blocking
Solution Overview
Problem
Existing battery modules face safety issues due to high-temperature solid exhaust ejected from can bottom valves during thermal runaway, which can cause short circuits and thermal failures.
Innovation Solution
A battery module design featuring a lead plate with a double-supported arm and gas permeation gaps that blocks the passage of high-temperature solid exhaust while allowing gas to permeate, using a double-supported arm to prevent deformation and securely exhaust gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the can bottom valve opens to exhaust high-temperature gas when internal pressure rises, then the internal pressure can be reduced, but solid exhaust is ejected together with the gas causing short circuits and thermal failures
Solution Approach 1:
The exhaust is segmented into gas phase and solid particle phase. The gas permeation gap allows gas to pass through while the double-supported arm blocks solid particles, achieving separation of the exhaust components based on their physical state
Solution Approach 2:
The double-supported arm acts as an intermediary structure between the exhaust port and the battery module interior. It mediates the exhaust flow by allowing gas to pass through the gaps while blocking solid particles, preventing direct contact between solid exhaust and conductive parts
2Speed
If the can bottom valve opens to exhaust gas quickly, then thermal runaway can be mitigated, but the solid exhaust contacts conductive parts causing adverse effects
Solution Approach 1:
The double-supported arm serves as an intermediary that modifies the exhaust path. It enables rapid gas exhaust while simultaneously blocking solid particles from reaching conductive parts, thus maintaining high exhaust speed without the harmful effects of solid particle contact
3Stress or pressure
If the can bottom valve opens to release pressure, then internal pressure rise is prevented, but high-temperature solid exhaust causes thermal failure
Solution Approach 1:
The exhaust flow is segmented into temperature zones and material phases. The gas permeation gap allows high-temperature gas to pass through while blocking solid particles, effectively separating the thermal hazard from the mechanical hazard of solid particle contact
Solution Approach 2:
The double-supported arm acts as a thermal and physical barrier that mediates between the high-temperature exhaust and the battery module components. It allows heat-carrying gas to pass while blocking solid particles that would cause direct thermal damage and short 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 design effectively prevents adverse effects by blocking solid exhaust and ensuring safe gas exhaust, thereby enhancing safety and preventing internal pressure rises.
Implementation Method 1
a gas permeation gap of exhaust gas ejected from the exhaust port on both sides of the double-supported arm
Data Source
AI summary
A battery module includes a plurality of cylindrical batteries and lead plate connected to cylindrical batteries and electrically connecting the plurality of cylindrical batteries. Cylindrical battery includes can bottom valve including a thin-walled line ruptured and opening an exhaust port when an internal pressure of an outer covering can becomes higher than a threshold pressure. Lead plate includes double-supported arm arranged opposing a can bottom of cylindrical battery and coupled to lead plate at both ends at a position opposing can bottom valve, and gas permeation gap of exhaust gas ejected from the exhaust port on both sides of double-supported arm.