Battery Assembly Tapered Insertion Aid for Bolt Alignment
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Solution Overview
Problem
As the number of battery stack laminations increases, slight deviations in the small battery packs make it difficult to insert the through-bolt into the hole, decreasing assembly workability.
Innovation Solution
A tubular or cylindrical member with a progressively smaller inner diameter tapered portion is inserted into the through-hole of the battery module housing, aiding in the alignment and insertion of the through-bolt by correcting its position near the center, thereby improving assembly workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of battery stack laminations is increased, then the battery pack capacity is improved, but the assembly workability deteriorates due to through-bolt insertion difficulty
Solution Approach 1:
A tapered insertion auxiliary member is introduced as an intermediary component between the through-bolt and the through-hole. This auxiliary member with a tapered surface guides and corrects the insertion position of the through-bolt, enabling easy insertion even when there are deviations in hole positions among stacked battery packs, thus maintaining assembly workability while increasing battery pack capacity
Solution Approach 2:
The insertion auxiliary member features a tapered geometry where the inner diameter progressively decreases toward the tip. This parameter change in the auxiliary member's dimensions allows it to gradually guide and correct the through-bolt insertion position, transforming the insertion process from a precise alignment requirement to a self-correcting process that tolerates positional deviations
2Manufacturing precision
If strict alignment precision is required for through-bolt insertion, then the connection reliability is improved, but the assembly time increases
Solution Approach 1:
The tapered insertion auxiliary member serves as a mediator that performs the alignment function automatically during the insertion process. It eliminates the need for strict pre-alignment by providing real-time guidance and position correction, thereby reducing assembly time while ensuring reliable connection through proper alignment at the moment of insertion
Solution Approach 2:
The insertion auxiliary member is pre-installed in the through-hole before the through-bolt insertion. This preliminary action prepares the insertion path and position correction mechanism in advance, allowing the through-bolt to be inserted quickly without requiring time-consuming alignment adjustments
Data Source
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AI summary
The problem addressed by the present invention is to provide a battery pack with improved assembly workability. The assembled battery pack (1) is provided with: a plurality of battery modules (2) stacked on each other, each provided with a case (27) accommodating a unit cell (21); and a through- bolt (4) that penetrates a through hole (28) formed in the cases (27) along the stacking direction of the battery modules (2) to connect the battery modules (2) each other. The battery modules (2) are further provided with an insertion auxiliary member (3) that is inserted into at least one opening (29) of the through hole (28), and the insertion auxiliary member (3) has a tapered portion (213) such that the inner diameter thereof gradually decreases towards the tip of the insertion auxiliary member (3).