Battery Cell Deformation Part for Impact Resistance
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Solution Overview
Problem
Pouch-shaped batteries have low surface rigidity and mechanical strength, making them prone to damage from physical impact and scratches, which compromises their safety and durability, especially in slim designs where shape flexibility is required.
Innovation Solution
A battery cell design featuring an electrode assembly with a deformation part of varying sectional width at its outer edge, mounted in a battery case composed of multiple metal sheet case members, each with a receiving part corresponding to the deformation, enhancing durability and safety against external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pouch-shaped battery case made of laminate sheet is used, then the battery can be easily modified in shape and has low manufacturing cost, but the surface rigidity and mechanical strength are low making it prone to damage from physical impact
Solution Approach 1:
The patent applies composite materials by combining the laminate sheet (resin layers with metal isolation layer) with a metal case structure. The metal case provides enhanced mechanical strength and impact resistance while the laminate sheet maintains its advantages of shape flexibility and low manufacturing cost. This composite structure resolves the contradiction by integrating materials with complementary properties.
2Length of moving object
If the battery case is made thinner for slim device design, then the device thickness is reduced, but the mechanical strength and durability against external impact decrease
Solution Approach 1:
The metal case structure provides high strength-to-thickness ratio, enabling thin battery design while maintaining durability. The metal material inherently offers superior mechanical properties that allow reduced thickness without sacrificing protective capability against external impact.
Solution Approach 2:
The battery case is segmented into multiple components: the laminate sheet pouch and the metal case structure. This segmentation allows each component to fulfill its optimal function - the laminate sheet for electrical containment and the metal case for mechanical protection - enabling thin overall design while maintaining reliability.
3Adaptability or versatility
If a deformation part with varying sectional width is formed at the outer edge of the electrode assembly, then the battery can efficiently utilize internal device space and support various device shapes, but the structural complexity of the electrode assembly increases
Solution Approach 1:
The deformation part is applied locally at the outer edge of the electrode assembly rather than throughout the entire structure. This localized modification allows the electrode assembly to adapt to various device shapes while maintaining the simplicity of the main body structure, thus achieving versatility without excessive complexity.
Data Source
AI summary
A battery cell includes an electrode assembly mounted in a battery case. The electrode assembly includes positive electrodes, negative electrodes, and separators, wherein the separators are disposed respectively between the positive electrodes and the negative electrodes. The electrode assembly is provided with a deformation part, and has a sectional width of which is discontinuously or continuously decreased, and is formed at a portion of an outer edge of the electrode assembly. The battery case includes two or more case members, each made of a metal sheet, the case members being coupled to each other in a state in which the electrode assembly is mounted in the case members, at least one of the case members having a receiving part with an internal shape corresponding to the deformation part of the electrode assembly.