Battery Cell Shielding Structure for Explosion-Proof Valve Protection

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Solution Overview

Problem

The premature opening of explosion-proof valves in batteries due to the impact and corrosive effects of electrolytes, which can lead to unintended pressure relief and affect the normal operation of the battery.

Innovation Solution

A battery cell design that includes a housing with a weak portion for pressure relief, where a shielding member is placed inside the housing to cover and protect the weak portion from electrolyte impact, reducing damage and enhancing the protective effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the explosion-proof valve is located at the bottom of the battery and the electrolyte is located above it, then the pressure relief function is achieved, but the electrolyte causes premature opening of the explosion-proof valve due to long-term contact and impact

Engineering Contradiction:

Improvepressure relief functionVSAvoidelectrolyte impact on explosion-proof valve

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A shielding member is introduced as an intermediary component between the electrolyte and the explosion-proof valve. This shielding member covers at least a portion of the weak portion in the thickness direction of the first wall, blocking the harmful impact and contact of the electrolyte while allowing the pressure relief function to operate when needed.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The housing wall is segmented into different regions with distinct functions: the first wall contains the weak portion for pressure relief, while the shielding member provides localized protection. This segmentation allows the system to simultaneously achieve pressure relief capability and protection against electrolyte damage.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If a shielding member is added to protect the weak portion from electrolyte impact, then the protection effect is improved, but the device complexity increases

Engineering Contradiction:

Improveprotection of weak portionVSAvoidbattery cell structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shielding member is designed as a thin protective component that covers the weak portion. This thin-film approach provides effective protection against electrolyte impact while minimizing the increase in device complexity and maintaining a compact battery cell structure.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The shielding member covers at least a portion of the weak portion rather than the entire structure. This partial coverage approach provides sufficient protection against electrolyte impact while avoiding unnecessary complexity and material usage.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250015429A1Battery cell, battery, and electric apparatus

Publication Date: 2025.01.09 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

Provided are a battery cell, a battery, and an electric apparatus. The battery cell includes a housing and a shielding member. The housing has an inner cavity, the housing has a first wall, and the first wall is provided with a weak portion. The shielding member is disposed in the inner cavity, and the shielding member covers at least a portion of the weak portion in a thickness direction of the first wall. In the battery cell of this application, the shielding member covers at least a portion of the weak portion from the inside of the housing, thereby preventing direct contact between the electrolyte and the at least a portion of the weak portion, protecting the weak portion.