Battery Pouch Sealing Blocks With Differential Heating Zones
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Solution Overview
Problem
The non-uniform sealing quality of secondary battery pouches due to heat loss at the electrode lead location during the sealing process, leading to inconsistent temperature distribution and compromised sealing integrity.
Innovation Solution
A sealing apparatus with paired sealing blocks that apply differential heating to the lead sealing and case sealing regions, ensuring uniform temperature distribution by maintaining higher temperatures at the lead sealing regions to compensate for heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single heating temperature is applied to both lead sealing and case sealing regions, then the heating unit structure is simple, but non-uniform sealing quality occurs due to heat loss at the electrode lead location
Solution Approach 1:
The heating unit is divided into multiple independent heating zones corresponding to different sealing regions (lead sealing region and case sealing region). Each heating zone can be controlled independently to provide different temperatures, allowing compensation for heat loss at the lead region while maintaining appropriate temperature at the case region, thus achieving uniform sealing quality across different areas.
Solution Approach 2:
Different heating temperatures are applied to different regions based on their specific requirements. The lead sealing region receives higher temperature to compensate for heat loss from the electrode lead, while the case sealing region receives lower temperature. This localized differential heating ensures optimal sealing quality for each region without affecting the other.
2Manufacturing precision
If the sealing temperature is increased to compensate for heat loss at the lead region, then sealing quality at the lead region improves, but overheating occurs at the case sealing region
Solution Approach 1:
The heating unit is segmented into multiple independent heating zones, allowing the lead sealing region to receive higher temperature while the case sealing region receives lower temperature. This prevents overheating at the case region while ensuring adequate sealing quality at the lead region.
Solution Approach 2:
Different temperature levels are applied locally to different sealing regions based on their specific thermal requirements. The lead sealing region receives higher temperature to compensate for heat loss, while the case sealing region receives lower temperature to prevent overheating, thus eliminating the harmful effect of uniform high temperature heating.
3Object-affected harmful factors
If the sealing temperature is decreased to prevent overheating at the case region, then overheating is avoided, but sealing quality at the lead region deteriorates due to heat loss
Solution Approach 1:
The heating unit is divided into multiple independent heating zones, allowing the lead sealing region to receive higher temperature compensation while the case sealing region receives lower temperature. This segmentation enables simultaneous prevention of case region overheating and maintenance of lead region sealing quality.
Solution Approach 2:
Different temperature levels are applied locally to different sealing regions. The lead sealing region receives higher temperature to compensate for heat loss from the electrode lead, while the case sealing region receives lower temperature to prevent overheating, thus resolving the contradiction between preventing overheating and maintaining sealing quality.
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
Ensures uniform sealing quality by maintaining consistent temperatures across the sealing regions, enhancing the reliability and integrity of the secondary battery.
Implementation Method 1
heat loss occurs due to an electrode lead at a region in which the electrode lead is located between the pouch
Implementation Method 2
The heating unit may heat the lead sealing regions and the case sealing regions of the pair of sealing blocks at different temperatures
Data Source
AI summary
A sealing apparatus for a secondary battery is disclosed, the sealing apparatus configured to seal a battery case of the secondary battery with an electrode assembly therein. The sealing apparatus comprises: a pair of sealing blocks which press the outer circumferential surface of the battery case; and a heating unit which is provided in the pair of sealing blocks and heat the pair of sealing blocks. The pair of sealing blocks comprise: lead sealing regions configured to press the lead sealing portion of the battery case; and case sealing regions configured to press the case sealing portion of the battery case. The heating unit heats the lead sealing regions and the case sealing regions of the pair of sealing blocks at different temperatures.