Cylindrical Battery Pressurization Part for Gas Trap Reduction
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Solution Overview
Problem
Cylindrical batteries using high Mn content positive electrode active materials face reduced lifespan and capacity due to gas traps, hydrofluoric acid layer formation, and lithium fluoride layer non-uniformity, leading to side reactions and reduced energy density.
Innovation Solution
Incorporating a pressurization part between the safety vent and receiving part in a cylindrical battery, which applies a predetermined pressure to reduce gas trap volume and promote uniform lithium fluoride layer formation, thereby improving battery lifespan and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high Mn content positive electrode active material is used, then battery output and energy density are improved, but battery lifespan is reduced due to gas traps and side reactions
Solution Approach 1:
A pressurization part is introduced as an intermediary component between the receiving part and the safety vent. This pressurization part applies predetermined pressure to the receiving part, preventing gas trap formation and suppressing side reactions that would otherwise reduce battery lifespan. The pressurization part mediates between the high output requirements and lifespan preservation by controlling the internal pressure environment.
Solution Approach 2:
The pressurization part applies predetermined pressure in advance to prevent the formation of gas traps and hydrofluoric acid layers before they can form and cause damage. By preemptively applying pressure, the system counteracts the tendencies toward gas accumulation and side reactions that would otherwise occur during battery operation with high Mn content materials.
2Quantity of substance
If high Mn content positive electrode active material is used, then battery capacity is improved, but uniformity of lithium fluoride layer formation is reduced leading to side reactions
Solution Approach 1:
The pressurization part serves as an intermediary that applies uniform pressure to the receiving part, ensuring consistent conditions for lithium fluoride layer formation throughout the battery. This uniform pressure distribution prevents non-uniform layer formation and the associated side reactions, while still allowing high Mn content materials to provide high capacity.
3Duration of action of moving object
If gas trap volume is reduced, then battery lifespan is improved, but pressure control complexity increases
Solution Approach 1:
The pressurization part changes the pressure parameter within the battery by applying predetermined pressure to the receiving part. This parameter change effectively reduces gas trap volume and prevents side reactions without requiring complex active control systems. The pressure application is designed to be simple yet effective, maintaining lifespan improvement while minimizing added complexity.
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 pressurization part effectively reduces gas trap volume and side reactions, enhancing battery lifespan and capacity retention by ensuring uniform reaction surfaces and preventing overpotential generation, while maintaining safety and energy density.
Implementation Method 1
a pressurization part located between a safety vent and a receiving part for applying a predetermined pressure to the receiving part
Data Source
AI summary
Disclosed herein is a cylindrical battery including an electrode assembly (jelly roll) including a positive electrode, a separator, and a negative electrode, a cylindrical container including a receiving part for receiving the electrode assembly together with an electrolytic solution, a cap assembly mounted to an open upper end of the cylindrical container, a safety vent mounted in the cap assembly, and a pressurization part located between the safety vent and the receiving part, the pressurization part communicating with the receiving part, the pressurization part being configured to apply a predetermined pressure, which is generated by gas, to the receiving part, wherein the positive electrode includes a lithium composite transition metal oxide represented by Formula 1 in the specification as a positive electrode active material.