Battery Cell Protective Frame for Electrode Assembly Damage Prevention

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Solution Overview

Problem

Current battery cells face issues with electrode assembly damage during installation and use, leading to reliability concerns and interference with the case, which affects energy density and assembly efficiency.

Innovation Solution

A protective frame with integrated protective plates is designed to shield the electrode assembly, providing overall rigidity and preventing damage, while minimizing space occupation and facilitating assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional welding methods (resistance welding, ultrasonic welding, laser welding) are used to connect current collectors to electrode plates, then connection strength can be achieved, but the electrode plates are damaged due to high spot temperatures causing material loss and poor surface quality

Engineering Contradiction:

Improveconnection strengthVSAvoidmaterial loss and surface quality degradation

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

A buffering layer is introduced as an intermediary between the current collector and the electrode plate. This buffering layer absorbs the thermal impact during welding, preventing direct heat transfer to the electrode plate while still allowing for strong electrical and mechanical connection. The buffering layer acts as a thermal barrier that protects the electrode plate from spot temperature damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the thermal parameters of the connection structure by introducing a layer with different thermal properties (the buffering layer). This buffering layer has lower thermal conductivity compared to the electrode plate, thereby reducing heat transfer to the electrode plate during welding and preventing material loss and surface degradation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the number of production lines is increased to meet growing battery demand, then productivity improves, but production cost increases due to higher equipment investment

Engineering Contradiction:

Improvebattery production capacityVSAvoidequipment investment

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The buffering layer structure is designed to be universally applicable across different battery production lines and configurations. Once the buffering layer technology is implemented, it can be used in various welding scenarios without requiring additional specialized equipment, thereby increasing productivity across multiple production lines without proportionally increasing equipment investment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If buffering layers are added to prevent welding damage, then electrode plate quality is protected, but the number of production steps increases and production efficiency decreases

Engineering Contradiction:

Improveelectrode plate damageVSAvoidproduction cycle time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The buffering layer is pre-installed on the current collector before the welding process. This preliminary preparation ensures that the electrode plate is protected from the outset during welding operations, eliminating the need for post-welding repairs or rework, and streamlining the production process to minimize time loss.

Inventive Principle:

Principle #10Preliminary action

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

The protective frame enhances the reliability and safety of battery cells by protecting the electrode assembly during installation and use, maintaining energy density, and improving assembly efficiency.

Implementation Method 1

buffering layers... to prevent material loss and surface quality degradation caused by spot temperature

Methodology Applied

Scientific EffectThermal energy absorption: Absorption (EM radiation)

Implementation Method 2

a conductive adhesive material is disposed between the current collector and the electrode plate

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP4362184B1Battery cell and manufacturing method therefor, battery, and electric device

Publication Date: 2026.04.22 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

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AI summary

Embodiments of the present application provide a battery cell and a manufacturing method and device therefor, a battery, and an electric device. A battery cell (100) comprises: an electrode assembly (1) comprising a main body part (11) and a tab (12), the tab (12) being connected to a side portion of the main body part (11) in a first direction (X); and a protective frame (2) having an integrated structure and comprising three sections of protective plates which are respectively used for protecting three side surfaces of the main body part (11), the three sections of protective plates comprising a first plate (21), a second plate (22), and a third plate (23), the third plate (23) being located between the first plate (21) and the second plate (22), two ends of the third plate (23) being respectively connected to a first end of the first plate (21) and a first end of the second plate (22), and at least one of the first plate (21), the second plate (22), and the third plate (23) being provided with an opening (231), wherein the tab (12) is led out from the opening (231).