Battery Pack Flexible Wiring for Balanced Cell Voltage Sensing
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Solution Overview
Problem
Existing battery packs face challenges in efficiently transmitting battery-cell state information due to resistance imbalances and potential electrical shorts caused by uneven connection of conductive lines, which can lead to measurement errors and instability in voltage information transmission.
Innovation Solution
The battery pack incorporates a flexible wiring system with distinct groups of conductive lines that branch off from a common end portion, featuring cut positions and bridge lines to ensure stable connections and parallel conductive lines for balanced information transmission, and includes connection members to reinforce physical connections while preventing electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conductive lines are connected to battery cells at different positions, then the battery pack structure becomes more flexible, but resistance imbalances occur causing measurement errors
Solution Approach 1:
The conductive lines are divided into multiple groups (first group and second group) that branch off from the first end portion at different positions. Each group connects to different battery cells, allowing flexible connection adaptation while maintaining balanced resistance paths through the branching structure
Solution Approach 2:
The patent introduces a folded portion at a specific location on the first group of conductive lines to adjust local connection characteristics. This folded portion modifies the electrical path length and resistance at that specific location, enabling precise compensation for resistance imbalances while maintaining overall connection flexibility
2Ease of manufacture
If conductive lines are physically bound at a single end portion, then manufacturing is simplified, but electrical shorts may occur due to uneven connection
Solution Approach 1:
The conductive lines are segmented into multiple groups that branch off from the common first end portion. This segmentation allows each group to be independently positioned and connected to specific battery cells, preventing uneven connection and electrical shorts while maintaining the manufacturing advantage of a unified binding point
Solution Approach 2:
The folded portion acts as an intermediary element that adjusts the spatial arrangement and electrical characteristics of the first group of conductive lines. It mediates between the simplified single-point binding and the need for precise, even connections by providing local geometric modification
3Reliability
If conductive lines extend in parallel, then information transmission is balanced, but the wiring structure becomes more complex
Solution Approach 1:
The first end portion serves multiple functions: it physically binds all conductive lines together for simplified manufacturing, and it serves as the branching point where conductive lines separate into parallel groups for balanced information transmission. This multi-functionality reduces overall system complexity
Data Source
AI summary
A battery pack including battery cells; a circuit unit connected to the battery cells; and a flexible wiring connecting the battery cells and the circuit unit to each other, wherein the flexible wiring includes a first end portion to which a plurality of conductive lines are physically bound; and a first group of conductive lines and a second group of conductive lines which extend from the first end portion, branch off from each other, and then extend in parallel to each other, and the first group of conductive lines includes a folded portion at a branching position at which the first group of conductive lines is separated from the second group of conductive lines.