Battery Vent Protective Member for Thermal Runaway Gas Shielding
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring safety during thermal runaway, as high-pressure gas release can pierce protective members, leading to potential damage and energy density loss, with current solutions either compromising safety or energy efficiency.
Innovation Solution
A battery design incorporating a protective member with optimized dimensions and placement relative to the pressure relief mechanism, where the D/G ratio is limited to 2×10−3 mm·s/L to 3.3×10−1 mm·s/L, ensuring effective thermal protection while minimizing redundancy and energy density loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective member is made thicker to prevent piercing by high-pressure gas during thermal runaway, then safety is improved, but energy density is reduced due to increased volume and weight
Solution Approach 1:
The patent applies parameter changes by establishing a quantitative relationship between the protective member's thickness D and the gas flow rate G through the ratio D/G. By controlling this parameter within a specific range (2×10−3 mm·s/L ≤ D/G ≤ 3.3×10−1 mm·s/L), the patent optimizes the protective member's thickness to provide adequate safety while minimizing unnecessary material usage that would reduce energy density.
2Reliability
If the protective member dimension D is increased to reduce piercing risk, then safety is improved, but the volume and weight of the protective member increase
Solution Approach 1:
The patent controls the protective member's weight by establishing a quantitative parameter relationship. By limiting the ratio D/G (where D is the protective member thickness and G is the gas flow rate), the patent determines the minimum necessary thickness without excessive redundancy, thereby minimizing the protective member's weight while maintaining adequate safety against piercing during thermal runaway.
3Temperature
If the protective member dimension D is increased to reduce heat transfer to the first wall, then thermal protection is improved, but energy density is reduced
Solution Approach 1:
The patent applies parameter changes by establishing a quantitative relationship between the protective member's thickness D and the gas flow rate G. By controlling the ratio D/G within a specific range, the patent optimizes the thermal protection capability while minimizing the protective member's volume, thereby reducing heat transfer to the first wall without unnecessarily reducing energy density.
4Loss of energy
If the protective member dimension is optimized to reduce redundancy, then energy density loss is reduced, but thermal protection requirements must be precisely met
Solution Approach 1:
The patent resolves this contradiction by establishing a quantitative parameter range for D/G (2×10−3 mm·s/L ≤ D/G ≤ 3.3×10−1 mm·s/L). This parameter control approach allows for optimized protective member dimensions that reduce redundancy and energy density loss, while the defined range provides clear manufacturing guidance to ensure thermal protection requirements are precisely met without excessive conservatism.
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 risk of the protective member being pierced and minimizes heat transfer to the battery's internal walls, enhancing safety and energy efficiency by balancing thermal protection and energy density.
Implementation Method 1
configured to cover the pressure relief hole in an axial direction of the pressure relief hole... reduce heat transferred to the first wall
Implementation Method 2
the pressure relief mechanism is configured to form a pressure relief hole for releasing substances inside the battery unit
Data Source
AI summary
Provided a battery and an electric apparatus. The battery includes a box, a battery unit, and a protective member. The box includes a first wall. The battery unit is accommodated within the box, where the battery unit is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to form a pressure relief hole for releasing substances inside the battery unit. The protective member is accommodated within the box, where at least a portion of the protective member is located between the first wall and the pressure relief mechanism and configured to cover the pressure relief hole in an axial direction of the pressure relief hole. battery unitIn the embodiments of this application, redundancy designed for the dimension of the protective member can be reduced while thermal protection requirements are met, thereby reducing energy density loss of the battery and improving safety of the battery.