Battery Pack Restraint Band Bead for Cover Expansion Control
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Solution Overview
Problem
Existing battery pack designs require a thicker fixing band to suppress expansion, leading to increased weight.
Innovation Solution
A battery pack design featuring a top wall with a base for fastening a second fastening member, a restraint band with a top plate portion having a bead that covers the base, and a second fastening member that secures the covering portion to the base, enhancing the rigidity of the top wall and top plate portion without significantly increasing the restraint band's weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the fixing band is increased to more reliably suppress the expansion of the exterior package, then the suppression of expansion is improved, but the weight of the fixing band increases
Solution Approach 1:
The restraint band is divided into a flat portion and a folded portion, creating distinct functional zones. The folded portion provides enhanced restraint capability through its layered structure, while the flat portion maintains lower weight. This segmentation allows the band to suppress expansion effectively without requiring uniform thickness throughout, thus avoiding excessive weight increase.
Solution Approach 2:
The restraint band has different structural properties in different regions: the folded portion has higher thickness and restraint capability where needed, while the flat portion has lower thickness. This local differentiation ensures that material is concentrated where it provides maximum benefit for suppressing expansion, rather than uniformly increasing weight across the entire band.
2Strength
If the thickness of the restraint band is increased to enhance rigidity, then the rigidity is improved, but the weight of the restraint band increases
Solution Approach 1:
The restraint band is segmented into flat and folded portions, each serving different structural purposes. The folded portion provides localized rigidity enhancement through its multi-layered construction, while the flat portion contributes minimal weight. This segmentation enables the band to achieve necessary rigidity without uniformly increasing thickness and weight throughout.
Solution Approach 2:
Different regions of the restraint band have different thickness characteristics: the folded portion has greater thickness for rigidity, while the flat portion has lesser thickness. This local quality differentiation ensures that rigidity is enhanced only where structurally necessary, avoiding unnecessary weight increase in other areas.
Data Source
AI summary
A battery pack includes: a battery stack; a lower case that houses the battery stack; an upper cover that covers the battery stack; a restraint band that restrains the upper cover; a first fastening member that fastens the upper cover to the lower case; and a second fastening member that fastens the restraint band to the upper cover. The upper cover has a top wall provided above the battery stack, and the top wall includes a base for fastening the second fastening member. The restraint band has a top plate portion provided above the top wall, the top plate portion has a bead extending in one direction, and the bead has a covering portion that covers the base. The second fastening member fastens the covering portion to the base.