Pouch Sealing Preheating for Uniform Secondary Battery Seal Force
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Solution Overview
Problem
The sealing force of secondary battery pouches is reduced due to heat loss through metal electrode leads, and there is a temperature difference across the pouch leading to uneven sealing forces.
Innovation Solution
A preheating member is used to heat the sealing part of the pouch and the sealing blocks to a preheat temperature lower than the seal temperature before sealing, minimizing heat loss through the electrode lead and ensuring uniform heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a lead heater system is introduced to heat the electrode lead, then heat loss through the electrode lead is minimized and sealing force is increased, but there is a temperature difference in the entire pouch leading to uneven sealing force
Solution Approach 1:
The heating system is divided into multiple independent heating zones along the sealing part. Each heating zone can be controlled separately to provide localized heating where needed, preventing temperature differences across the pouch and ensuring uniform sealing force throughout the sealing part.
Solution Approach 2:
Heating is applied selectively to specific regions of the sealing part rather than uniformly across the entire pouch. The heating zones are positioned to target areas with greater heat loss through electrode leads, providing localized thermal compensation while maintaining overall sealing uniformity.
2Manufacturing precision
If the sealing block temperature is maintained for continuous manufacture, then sealing force remains uniform, but the heat source temperature decreases over time requiring additional heating
Solution Approach 1:
The sealing block is preheated to the required temperature before the sealing process begins. This preliminary heating ensures that the sealing block maintains sufficient temperature throughout continuous manufacturing operations, preventing temperature decrease and maintaining uniform sealing force without requiring frequent reheating interruptions.
Solution Approach 2:
The heating system operates continuously during the sealing process to maintain the sealing block temperature. By providing continuous thermal energy input, the system compensates for heat loss during continuous manufacturing, ensuring the sealing block remains at the optimal temperature for uniform sealing force throughout the production run.
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
This approach increases the sealing force of the pouch, maintains uniform sealing quality across all batteries, and reduces the time required for sealing, thereby increasing productivity.
Implementation Method 1
a preheating member that preheats each of the sealing part of the pouch and the pair of sealing blocks to a preheat temperature
Implementation Method 2
as a lead film and the sealing part are thermally fused to each other, the sealing part of the pouch from which an electrode lead is drawn out is sealed
Data Source
AI summary
A device for manufacturing a secondary battery includes: a pair of sealing blocks that are disposed at both sides, respectively, of a sealing part of a pouch from which an electrode lead is drawn out, the pair of sealing blocks being configured to compress and seal the sealing part at a seal temperature and pressure; and a preheating member that preheats each of the sealing part of the pouch and the pair of sealing blocks to a preheat temperature. The preheating member includes a first heating body that preheats to the preheat temperature a surface of the sealing part, on which each of the pair of sealing blocks is disposed, and a second heating body that preheats to the preheat temperature a surface of each of the pair of sealing blocks, which faces the sealing part.