Battery Casing Isolating Section Absorbent for Leakage
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Solution Overview
Problem
Soft package lithium batteries face safety issues due to electrolyte leakage and gas production, which can lead to corrosion and breakage, especially after long-term use or water exposure, and current solutions either compromise battery performance or increase material costs.
Innovation Solution
A battery design featuring a casing with conductive tabs and an absorbent material placed in an isolating section between inner and outer sealed sections of the casing to absorb moisture and gas, reducing the risk of rupture and electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If absorbent is added to the battery casing, then the risk of electrolyte leakage and moisture ingress is reduced, but the device complexity increases
Solution Approach 1:
The sealed region of the second peripheral portion is divided into three distinct sections: an inner sealed section adjacent to the sealed edge, an outer sealed section away from the sealed edge, and an isolating section disposed between them. This segmentation allows the absorbent to be placed in the isolating section, creating a dedicated zone for moisture and gas absorption while maintaining structural organization and reducing overall device complexity.
Solution Approach 2:
The absorbent material acts as an intermediary element placed within the isolating section of the casing. It mediates between the potential sources of moisture/gas (from the cell or external environment) and the sensitive components of the battery, absorbing these harmful substances before they can cause damage, thereby reducing electrolyte leakage risk without requiring complete redesign of the battery structure.
2Object-generated harmful factors
If existing gas production solutions (enclosing electrodes, doping, electrolyte additives) are implemented, then gas production is reduced, but material costs increase and other battery performances are compromised
Solution Approach 1:
Instead of modifying the electrodes or electrolyte composition to reduce gas production, this invention extracts the gas handling function from the active battery components and relocates it to a separate absorbent material in the isolating section. This extraction approach allows the battery's core components to remain simple and cost-effective while the absorbent handles the gas production issue independently.
Solution Approach 2:
The invention converts the harmful effect of gas production into a manageable situation by using the absorbent material to capture and neutralize the gas. Rather than trying to prevent gas formation through complex material modifications, the gas is allowed to form but is then beneficially absorbed and contained, transforming a harmful byproduct into a controlled situation that doesn't compromise battery performance or increase manufacturing costs.
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 absorbent effectively reduces the risk of electrolyte leakage and moisture ingress, maintaining battery performance while simplifying and cost-reducing the manufacturing process.
Implementation Method 1
The absorbent is received in the isolating section for absorbing moisture or gas
Data Source
AI summary
A battery includes a casing having two first peripheral portions and two second peripheral portions, a cell disposed within the casing, two conductive tabs electrically connected to the cell and exposed from at least one of the first peripheral portions, and an absorbent. Each of the second peripheral portions has a sealed region that has a sealed edge adjacent to the cell. The sealed region of at least one of the second peripheral portions has an inner sealed section disposed adjacent to the sealed edge, an outer sealed section, and an isolating section disposed between the inner sealed section and the outer sealed section. The absorbent is received in the isolating section for absorbing moisture or gas.