Battery Pack BMS Surface Mounting and Asymmetry
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Solution Overview
Problem
Existing battery packs face challenges with lead wire length inefficiencies, measurement errors due to wire unbalance, and erroneous polarity connections, which affect the performance and reliability of battery management systems in high-power applications.
Innovation Solution
The design incorporates a battery management system positioned on an exterior surface, extending in a direction perpendicular to the battery cells, with a misassembly prevention mechanism using convex and concave coupling parts to ensure correct orientation and reduce lead wire length imbalance, and bus bars for parallel or series connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery management system is positioned inside the battery pack with traditional lead wire connections, then the electrical connection is established, but the lead wire length increases causing measurement errors and reduced reliability
Solution Approach 1:
The battery management system is moved from an internal position to an external position on the surface of the battery pack, changing the spatial dimension of connection. This dimensional transition allows lead wires to connect along the surface rather than extending through the interior, significantly reducing lead wire length and improving measurement accuracy while maintaining electrical connection functionality.
Solution Approach 2:
The battery management system is extracted from the internal structure of the battery pack and positioned externally on the surface. This extraction eliminates the need for long internal lead wire connections, reducing measurement errors caused by wire resistance and inductance, while the system remains functionally integrated through optimized surface mounting.
2Ease of manufacture
If the battery cells are arranged without orientation control, then assembly is simple, but erroneous polarity connections may occur
Solution Approach 1:
Convex and concave coupling parts are introduced as asymmetric features on the battery pack surface. These asymmetric structures provide visual and physical guidance for correct assembly orientation, ensuring that battery cells with matching polarity configurations can be properly aligned. The asymmetric design maintains assembly simplicity while preventing erroneous polarity connections through mechanical interlocking.
3Length of moving object
If the battery management system is positioned on the exterior surface extending perpendicular to battery cells, then lead wire length is reduced, but the device complexity increases
Solution Approach 1:
The battery management system is repositioned to the exterior surface with its extension direction perpendicular to the battery cell arrangement, utilizing the surface dimension rather than internal volume. This spatial reconfiguration reduces lead wire length significantly while the added structural elements (convex-concave coupling parts) provide assembly guidance that simplifies the manufacturing process, effectively balancing the trade-off between reduced wire length and structural complexity.
Data Source
AI summary
A battery pack is disclosed. In one aspect, the battery pack includes a plurality of battery cells each extending in a first direction and a battery management system (BMS) configured to control a charging/discharging operation of the battery cells. The BMS is placed at one of exterior surfaces of the battery cells and extends in a direction crossing the first direction.