Battery Cell Terminal Post Through-Hole for Space-Efficient Connection

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Solution Overview

Problem

Existing battery cells face challenges in improving energy density and stability due to space occupation by conductive portions and the risk of short circuits, which affect their reliability and performance.

Innovation Solution

The battery cell design incorporates a through hole in the terminal post to accommodate part of the conductive portion, reducing space and enhancing the connection stability by using a cover plate welded to the conductive portion, with specific welding regions and a boss structure to improve assembly and welding quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the conductive portion is placed inside the case, then the electrical connection is established, but the space for active material-coated portion is reduced

Engineering Contradiction:

Improveelectrical connection stabilityVSAvoidvolumetric energy density

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The conductive portion is routed through the terminal post (vertical dimension) instead of being placed horizontally inside the case, utilizing the Z-axis space to reduce occupation of the active material-coated portion area

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The conductive portion is nested within the terminal post structure, which itself is part of the battery cell assembly, creating a compact hierarchical arrangement that optimizes space utilization

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the conductive portion is extended to connect terminal post and electrode assembly, then electrical connection is achieved, but the probability of short circuit increases

Engineering Contradiction:

Improveelectrical connectionVSAvoidshort circuit probability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The conductive portion is extracted from the case interior and routed through the terminal post, removing it from the harmful environment inside the case where it could contact active material and cause short circuits

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The terminal post serves as an intermediary structure that provides a dedicated pathway for the conductive portion, isolating it from direct contact with the active material-coated portion while maintaining electrical connection

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If the terminal post is made solid without through hole, then structural strength is maintained, but the weight increases

Engineering Contradiction:

Improveterminal post strengthVSAvoidgravimetric energy density

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The terminal post is designed with a through hole creating a hollow structure, reducing material usage and weight while maintaining sufficient structural strength for the application

Inventive Principle:

Principle #31Porous materials

4Ease of manufacture

If the cover plate is connected to conductive portion without welding, then assembly is simpler, but connection strength is insufficient

Engineering Contradiction:

Improveassembly simplicityVSAvoidconnection strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The mechanical connection system is replaced with welding (thermal/electrical process), providing stronger and more reliable connection between the cover plate and conductive portion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design increases volumetric and gravimetric energy densities, reduces short circuit probability, and enhances the reliability and stability of the battery cell by optimizing space utilization and connection integrity.

Implementation Method 1

the cover plate is connected, by welding, to the conductive portion

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentEP4685991A1Battery cell, battery cell preparation method, battery, and electrical apparatus

Publication Date: 2026.01.28 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

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AI summary

Provided are a battery cell (100), a method for preparing a battery cell (100), a battery (1000), and an electrical apparatus. The battery cell (100) comprises: a case (10) comprising a first wall (11); a terminal post (20) arranged on the first wall (11) and having a through hole (211); a cover plate (40) arranged on one side of the terminal post (20) and covering one respective end of the through hole (211); and an electrode assembly (30) comprising an active material-coated portion (31) and a conductive portion (32) connected to the active material-coated portion (31), wherein the active material-coated portion (31) is arranged in the case (10), and at least a portion of the conductive portion (32) is arranged in the through hole (211) and connected to the cover plate (40).