Battery Cover Plate Weak-Point Venting Against Thermal Runaway
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Solution Overview
Problem
In electric vehicle battery assemblies, thermal runaway in one battery can lead to cascading thermal runaway and potential fires, as high temperature substances from affected batteries can spread to others, compromising safety and stability.
Innovation Solution
A battery design featuring a cover plate with a high temperature resistant sheet that covers a first hole, including a weak portion which can break to discharge high pressure or temperature, preventing thermal runaway propagation and ensuring the original explosion-proof mechanism functions correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover plate body is provided with a first hole for explosion-proof function, then the explosion-proof mechanism can function normally, but high temperature substances can enter the battery from the first hole causing thermal runaway propagation
Solution Approach 1:
A high temperature resistant sheet is introduced as an intermediary component between the first hole and the battery interior. This sheet selectively blocks high temperature substances while allowing pressure relief, thus mediating between the explosion-proof function and thermal runaway prevention requirements
Solution Approach 2:
The cover plate is segmented into multiple functional layers: the cover plate body with the first hole for explosion-proof function, and the high temperature resistant sheet covering the first hole for thermal isolation. This segmentation allows each layer to specialize in one function
2Object-affected harmful factors
If the high temperature resistant sheet is made intact to block thermal runaway, then thermal propagation is prevented, but pressure and temperature accumulation inside the battery cannot be discharged
Solution Approach 1:
The high temperature resistant sheet is designed with non-uniform structure: most areas are intact to block thermal runaway, while a specific local area contains a weak portion that can break under high pressure/temperature to enable discharge
3Device complexity
If the original explosion-proof mechanism is used without modification, then the structure is simple, but it cannot prevent thermal runaway propagation while maintaining pressure relief function
Solution Approach 1:
The high temperature resistant sheet is integrated with the cover plate body through fixed connection, merging the thermal protection function with the existing explosion-proof structure into a unified safety system
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 solution effectively reduces the probability of thermal runaway propagation and enhances safety by allowing pressure and temperature release, thereby minimizing the risk of explosions or fires within the battery assembly.
Implementation Method 1
the high temperature resistant sheet is disposed on an upper surface of the cover plate body and covers an upper opening of the first hole
Implementation Method 2
The high temperature resistant sheet has a weak portion, and at least a part of an orthographic projection of the weak portion is located in the first hole
Data Source
AI summary
A battery, a battery assembly, and an electronic apparatus are provided. The battery includes: a casing having an opening; a cell disposed in the casing; and a cover plate covering the opening of the casing. The cover plate includes a cover plate body provided with a first hole and a high temperature resistant sheet disposed on an upper surface of the cover plate body and covering an upper opening of the first hole. The high temperature resistant sheet has a weak portion, and at least a part of an orthographic projection of the weak portion is located in the first hole in a direction perpendicular to the cover plate body.