Battery Module Lead Layout to Prevent Pouch Cell Interference
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Solution Overview
Problem
Conventional battery modules face damage due to interference between neighboring battery cells connected to a common bus bar, leading to anode connection phenomena that weaken sealing and insulating performances, requiring additional insulating materials to prevent.
Innovation Solution
The battery module design incorporates bent electrode leads with specific bending angles and directions to prevent contact between electrode leads and the pouch case boundary, eliminating the need for additional insulating components by shaping the electrode leads to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrode leads are drawn out through the same lead drawing hole to be combined to a same bus bar, then electrical connection efficiency is improved, but interference between neighboring battery cells occurs causing anode connection
Solution Approach 1:
The patent divides the lead drawing holes into different types (first lead drawing holes and second lead drawing holes) to segment the electrical connection paths. Neighboring battery cells are connected through different holes, preventing interference while maintaining connection efficiency.
Solution Approach 2:
The patent introduces an insulating member as an intermediary between the electrode lead and the boundary portion of the pouch case. This mediator prevents direct contact that would cause anode connection, while allowing the electrode lead to maintain its electrical connection function.
2Reliability
If insulating tape is attached to prevent anode connection, then sealing performance is improved, but manufacturing complexity increases due to additional components and processes
Solution Approach 1:
The patent designs the battery cell structure itself to prevent anode connection through the specific arrangement of lead drawing holes and the use of insulating members that are integrated into the existing structure. This self-service approach eliminates the need for additional insulating tapes and complex attaching processes.
Solution Approach 2:
The insulating member serves as a built-in intermediary that prevents anode connection without requiring external insulating tapes. This integrated mediator simplifies the manufacturing process by eliminating separate insulating tape attachment steps.
Data Source
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AI summary
Provided is a battery module including: a cell stack structure in which a plurality of battery cells including a first battery cell and a second battery cell neighboring each other are stacked; and a bus bar frame assembly combined to at least one side of the cell stack structure and including a plurality of lead drawing holes from which electrode leads included in the plurality of battery cells are drawn out, wherein an electrode lead of a first polarity included in the first battery cell and an electrode lead of the first polarity included in the second battery cell are externally drawn out through a same lead drawing hole, and wherein the electrode lead of the first polarity of the first battery cell and the electrode lead of the first polarity of the second battery cell have shapes bent in a same direction at a same location and each include a first bent portion formed on a terrace portion and a second bent portion formed in a region where a lead film is formed.