Battery Electrode Tab Structure for Heat Dissipation and Current Capacity
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Solution Overview
Problem
The increasing energy density requirements of batteries lead to larger electrode assemblies, resulting in severe heat emission issues due to insufficient current-carrying capacity and rapid temperature rises during charging or discharging, which compromises safety and efficiency.
Innovation Solution
The electrode assembly design includes a protruding portion with a larger cross-sectional area, made of the same material as the metal substrate, and a conductive piece with lower resistivity, connected to the body portion, enhancing current-carrying capacity and heat dissipation, thereby reducing heat emission risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of the electrode assembly is increased to meet higher energy density requirements, then the battery capacity is improved, but the heat emission of the tab becomes severe and safety is compromised
Solution Approach 1:
The patent extends the tab structure from a simple planar configuration to a three-dimensional protruding portion that extends along the length direction of the electrode assembly. This dimensional extension increases the cross-sectional area and volume of the current-carrying path, thereby improving heat dissipation capability without compromising battery capacity
Solution Approach 2:
The tab is divided into multiple segments: the metal substrate, the protruding portion with body portion and conductive piece, and the connector adapter interface. This segmentation allows each part to be optimized for specific functions - the protruding portion for heat dissipation and current carrying, and the connector adapter for electrical connection
2Reliability
If the cross-sectional area of the tab is increased to improve current-carrying capacity, then heat emission is reduced, but the device complexity increases
Solution Approach 1:
The protruding portion integrates multiple functions into a single structural element: it serves as both the current-carrying conductor and the heat dissipation component. The body portion and conductive piece are merged to form a unified structure that simultaneously handles electrical conduction and thermal management
Solution Approach 2:
The tab structure exhibits local quality variations - the protruding portion has a larger cross-sectional area for heat dissipation, while the connector adapter interface maintains standard dimensions for compatibility. This localized optimization allows improved current-carrying capacity where needed without unnecessarily increasing overall device complexity
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 effectively improves the current-carrying capacity and heat dissipation of the electrode assembly, reducing overheating risks and enhancing the safety and efficiency of battery charging and discharging processes.
Implementation Method 1
the conductive piece and the body portion are made of different materials, and a resistivity of the conductive piece is less than a resistivity of the body portion. Compared with the body portion, the conductive piece with a low resistivity possesses a high current-carrying capacity
Implementation Method 2
the size of at least a part of the protruding portion is greater than a size of the metal substrate... the protruding portion possesses a relatively large cross-sectional area, so as to achieve a low resistance of the protruding portion. In addition, due to a high heat capacity of the protruding portion, the protruding portion achieves a relatively high current-carrying capacity
Data Source
AI summary
Embodiments provide an electrode assembly, a battery cell, a battery, an electrical apparatus, and a manufacturing method and device. In those embodiments, the electrode assembly includes: an electrode plate, including a main portion and at least one protruding portion. The main portion includes a metal substrate and an active material layer coated on a surface of the metal substrate. The protruding portion is connected to the metal substrate. The metal substrate protrudes along a length direction of the electrode assembly. Along a thickness direction of the electrode assembly, a size of at least a part of the protruding portion is greater than a size of the metal substrate. The electrode assembly according to the Embodiments aims to solve a technical problem of severe heat emission of a tab.