Curved Pouch Battery Bonding Unit for Mounting Stability
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Solution Overview
Problem
Rechargeable batteries face limitations in capacity and short-circuit prevention due to their curved shape and limited space in battery accommodating units, leading to instability and increased risk of short circuits.
Innovation Solution
A rechargeable battery design featuring a pouch case with a curved edge and a bonding unit that includes an upper and side bonding unit, forming a support space to secure the electrode assembly, along with an insulating member and protector to prevent corrosion and improve durability, allowing for enhanced stability and capacity within the battery accommodating space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pouch case is formed in a curved shape to fit the battery accommodating unit, then the battery can be mounted in the accommodating space, but creases are formed on the pouch case and capacity improvement is limited
Solution Approach 1:
The bonding unit is divided into a first bonding unit and a second bonding unit that are separated from each other, creating a support space between them. This segmentation allows the pouch case to maintain its curved shape for stable mounting while the support space prevents creases from forming on the electrode assembly, thereby preserving battery capacity.
Solution Approach 2:
The second bonding unit is bent in the thickness direction of the pouch case, creating a three-dimensional support space. This dimensional change allows the bonding unit to provide structural support without compromising the internal space available for the electrode assembly, thus maintaining battery capacity while achieving stable mounting.
2Volume of moving object
If the internal space of the battery accommodating unit is very small, then the battery can fit in the device, but short circuit may easily occur
Solution Approach 1:
The support space created between the first and second bonding units acts as an intermediary structure that physically separates and protects the electrode assembly. This support space prevents direct contact between positive and negative electrodes, thereby preventing short circuits while maintaining a compact battery size suitable for small accommodating units.
3Shape
If the pouch case is formed in a curved shape, then it can be mounted in the accommodating space, but there is a limitation in improving capacity
Solution Approach 1:
The curvature is applied locally only to the bonding units rather than the entire pouch case. The first bonding unit remains planar while the second bonding unit is bent in the thickness direction. This localized curvature allows the battery to fit the accommodating space shape while preserving maximum internal space for the electrode assembly, thus maintaining high capacity.
Data Source
AI summary
A rechargeable battery according to an exemplary embodiment of the present invention may include an electrode assembly which can charge and discharge a current, a lead tab which is electrically connected to the electrode assembly, and a pouch case including an accommodation unit in which the electrode assembly is accommodated, and of which at least a portion of an edge side is formed to be curved, and a bonding unit which is formed to be extended from the edge side of the accommodation unit and seals the accommodation unit, wherein the bonding unit may include an upper bonding unit from which the lead tab is drawn out and a side bonding unit which is bent in a thickness direction of the accommodation unit and enables a support space to be formed between the side bonding unit and the accommodation unit.