Battery cell, method for preparing battery cell, battery, and electrical apparatus

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing battery cells face challenges in improving energy density and stability due to space occupation by conductive portions, leading to increased probability of short circuits and reduced reliability.

Innovation Solution

Incorporating a through hole in the terminal post to accommodate at least a portion of the conductive portion, reducing redundancy and space occupation, and using a cover plate welded to the conductive portion to enhance stability and connection reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the conductive portion is arranged inside the case, then the electrical connection is ensured, but the space for active material-coated portion is reduced, lowering volumetric energy density

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidvolumetric energy density

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The conductive portion is routed through the terminal post structure (utilizing the vertical/depth dimension) rather than being laid flat within the case plane. This dimensional repositioning allows the conductive portion to occupy space that would otherwise be structural or empty, rather than competing directly with the active material-coated portion for horizontal space, thereby improving volumetric energy density while maintaining electrical connection reliability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The conductive portion is nested within the terminal post structure, specifically passing through the through hole of the terminal post. This nesting approach allows the conductive portion to be housed within an existing structural element rather than occupying additional space in the case, effectively utilizing otherwise wasted space and improving the volumetric energy density of the battery cell.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the conductive portion is made redundant for safety, then short circuit protection is improved, but the weight and space increase, reducing gravimetric and volumetric energy densities

Engineering Contradiction:

Improveshort circuit protectionVSAvoidgravimetric energy density

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The terminal post serves multiple functions: it provides structural support for the battery cell, acts as an electrical terminal for connection, and simultaneously serves as a housing structure (with its through hole) to contain and organize the conductive portion. This multi-functionality eliminates the need for separate protective structures, reducing overall weight and improving gravimetric energy density while maintaining short circuit protection capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The conductive portion is extracted from the interior case space and repositioned through the terminal post structure. This extraction removes the redundant conductive material from the valuable interior space, reducing both weight and volume occupation while the terminal post structure provides the necessary containment and protection, thereby improving energy density metrics.

Inventive Principle:

Principle #2Taking out (Extraction)

3Strength

If the terminal post is made solid for strength, then structural stability is improved, but weight increases, reducing gravimetric energy density

Engineering Contradiction:

Improveterminal post structural stabilityVSAvoidgravimetric energy density

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The terminal post employs a porous or hollow structure with a through hole running through it, rather than being completely solid. This porous design maintains sufficient structural strength for stability while significantly reducing the weight of the terminal post, thereby improving the gravimetric energy density of the battery cell without compromising structural integrity.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The terminal post utilizes a composite structure combining solid wall sections (for strength) with a hollow through hole (for weight reduction and conductive portion routing). This composite approach optimizes the strength-to-weight ratio, providing necessary structural stability while minimizing weight to improve gravimetric energy density.

Inventive Principle:

Principle #40Composite materials

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

Enhances volumetric and gravimetric energy densities while reducing short circuit probability, improving the overall reliability and stability of the battery cell.

Implementation Method 1

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

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentUS20260051584A1Battery cell, method for preparing battery cell, battery, and electrical apparatus

Publication Date: 2026.02.19 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

A battery cell comprises: a case comprising a first wall; a terminal post arranged on the first wall and having a through hole; a cover plate arranged on one side of the terminal post and covering one respective end of the through hole; and an electrode assembly comprising an active material-coated portion and a conductive portion connected to the active material-coated portion, wherein the active material-coated portion is arranged in the case, and at least a portion of the conductive portion is arranged in the through hole and connected to the cover plate.