Battery Cell Pressure Relief Using a Meltable Adhesive Film
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Solution Overview
Problem
Current steel-shell battery cells with laser-engraved grooves for pressure relief occupy large spaces, have poor thermal sensitivity, and increase preparation costs, affecting safety and reliability.
Innovation Solution
A battery cell with a housing featuring a first through hole covered by a pressure relief mechanism using an adhesive film that melts to form a channel, providing reliable pressure relief without the need for large reserved spaces, and utilizing the electrolyte injection hole for dual functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser-engraved grooves are used for pressure relief, then pressure relief function is provided, but the electric apparatus occupies large space and preparation costs increase
Solution Approach 1:
The patent uses a thin film structure (adhesive film covering the through-hole) instead of rigid laser-engraved grooves. The adhesive film has good thermal sensitivity and can be heated and melted to form a pressure relief channel, providing reliable pressure relief while occupying minimal space and eliminating the need for large reserved valve opening spaces.
Solution Approach 2:
The patent changes the physical state of the adhesive film from solid to melted state through heating when thermal runaway occurs. This parameter change allows the adhesive film to transform from a sealing state to a pressure relief state, enabling reliable pressure relief without requiring large structural spaces.
2Reliability
If laser-engraved grooves are used for pressure relief, then pressure relief function is provided, but preparation costs increase
Solution Approach 1:
The adhesive film provides a simpler, more cost-effective pressure relief mechanism compared to laser engraving. The thin film structure is easier to manufacture and install, reducing preparation costs while maintaining good thermal sensitivity and reliable pressure relief function.
Solution Approach 2:
The phase change of the adhesive film from solid to melted state provides a passive, automatic pressure relief mechanism that does not require complex laser engraving processes. This parameter-based solution simplifies manufacturing and reduces preparation costs.
3Reliability
If adhesive film is used for pressure relief, then thermal sensitivity and pressure relief reliability are improved, but the through-hole needs to be sealed
Solution Approach 1:
The through-hole serves multiple functions: it acts as both the electrolyte injection hole and the pressure relief channel. The adhesive film covers this multi-functional opening, sealing it during normal operation and automatically melting to provide pressure relief when needed, thereby reducing overall structural complexity.
Solution Approach 2:
The adhesive film automatically melts and forms a pressure relief channel when thermal runaway occurs, without requiring external control or complex mechanical structures. This self-activating mechanism simplifies the overall device structure while ensuring reliable pressure relief.
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 solution enhances safety and compactness by ensuring reliable pressure relief with improved thermal sensitivity and reduced preparation costs, allowing for a more compact electric apparatus design.
Implementation Method 1
the adhesive film being capable of being heated and melted to form a pressure relief channel connecting the inside and outside of the housing
Implementation Method 2
a pressure relief mechanism covering the first through hole, where the pressure relief mechanism includes an adhesive film
Data Source
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AI summary
Some embodiments of this application provide a battery cell and an electric apparatus, and relate to the field of battery technologies. The battery cell includes a housing and a pressure relief mechanism. The housing is provided with a first through hole and the pressure relief mechanism covers the first through hole. The pressure relief mechanism includes an adhesive film, and the adhesive film can be heated and melted to form a pressure relief channel connecting the inside and outside of the housing. The pressure relief mechanism has good thermal sensitivity, allowing for highly reliable pressure relief, thus improving the safety of the battery cell. In addition, as compared with the pressure relief mechanism with engraved grooves, no large space needs to be reserved in some embodiments, allowing for a more compacted structure of the electric apparatus and lower preparation costs of the pressure relief mechanism.