Battery Cell Post Terminal Perforation for Higher Energy Density
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Solution Overview
Problem
Current battery cells face challenges in increasing energy density, which limits the driving range of vehicles.
Innovation Solution
The battery cell design includes a first post terminal connected to multiple conductive parts with stacked tab plates, featuring perforations to accommodate conductive parts, reducing their size and extension length, and allowing flexible perforation selection to enhance structural strength and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conductive parts are connected to a single post terminal through a single large perforation, then electrical connection is achieved, but the structural strength of the post terminal deteriorates due to the large perforation size
Solution Approach 1:
The single large perforation is segmented into multiple smaller perforations on the post terminal. Each conductive part passes through a separate perforation, distributing the structural weakness across multiple small holes rather than one large hole, thereby maintaining post terminal strength while achieving electrical connection for multiple conductive parts.
2Reliability
If conductive parts extend through the housing with long extension lengths, then electrical connection is achieved, but the space occupied in the housing increases, reducing energy density
Solution Approach 1:
The conductive parts are nested within the post terminal structure by passing them through perforations in the post terminal rather than extending them through the entire housing. This nesting approach allows the conductive parts to be contained within the compact post terminal volume, significantly reducing the space they occupy in the housing and increasing energy density.
3Reliability
If the number of tab plates in each conductive part is increased, then electrical connection reliability is improved, but the gathering height and occupied size of conductive parts increase
Solution Approach 1:
Instead of increasing the number of tab plates in the vertical stacking direction (which increases gathering height), the solution transitions to the horizontal dimension by using multiple separate conductive parts, each with fewer tab plates, passing through different perforations. This dimensional shift allows maintaining electrical connection reliability while reducing the vertical space occupied by each conductive part.
Data Source
AI summary
A battery cell, a battery, and an electric device, relating to the technical field of batteries. The battery cell comprises a casing assembly and a core assembly; the casing assembly comprises a casing and a first pole arranged on the casing; the core assembly is accommodated in the casing and comprises conductive parts electrically connected to the first pole, and each conductive part comprises a plurality of tabs which are stacked, and gathered and connected; a plurality of conductive parts are electrically connected to the first pole, the first pole is provided with a plurality of through holes, and at least one conductive part respectively passes through each through hole.