Rectangular Battery Current Collector Layout for Heat Dissipation
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Solution Overview
Problem
Existing secondary batteries experience excessive temperature rises due to increased current flow, which can deteriorate resin parts and alter electrolytes.
Innovation Solution
A rectangular secondary battery design featuring a current collector connected to the positive or negative electrode plate at a longitudinal end of the sealing plate, with an external terminal outside the sealing plate and an insulating holder wrapping the electrode body and current collector, facilitating heat dissipation through the battery case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the current flow through the battery is increased to achieve higher output, then the power output is improved, but the temperature inside the battery rises excessively
Solution Approach 1:
The patent extracts the heat dissipation function from the internal battery structure by introducing a current collector that extends outside the battery case. The current collector acts as a separate heat dissipation pathway, conducting heat away from the battery interior to the external environment, thereby resolving the temperature rise problem while maintaining high power output
Solution Approach 2:
The current collector serves as an intermediary component between the electrode body and the external environment. It mediates the heat transfer process by conducting heat from the electrode body through the sealing plate to the external atmosphere, enabling efficient heat dissipation without compromising the battery's power output capability
2Reliability
If the current collector is placed inside the battery, then the electrical connection is maintained, but the heat dissipation efficiency is insufficient
Solution Approach 1:
The current collector is designed to perform multiple functions simultaneously: it maintains electrical connection between the electrode body and external terminal while also serving as a heat dissipation conductor. By extending outside the battery, it fulfills both electrical and thermal management functions, improving heat dissipation efficiency without compromising electrical reliability
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 reduces temperature rises within the battery by quickly dissipating generated heat to the outside through the battery case, enhancing thermal management and preventing potential damage from excessive heat.
Implementation Method 1
the current collector being in contact with a bottom of the battery case with the insulating holder interposed therebetween
Data Source
AI summary
A rectangular secondary battery includes: an electrode body including a positive electrode plate and a negative electrode plate; a rectangular battery case having an opening and housing the electrode body; a sealing plate sealing the opening; a current collector connected to an edge of the positive electrode plate or the negative electrode plate at a longitudinal end of the sealing plate; and an external terminal located outside the sealing plate and connected to the current collector. The electrode body and the current collector is wrapped in an insulating holder and housed in the battery case. The current collector is in contact with a bottom of the battery case with the insulating holder interposed therebetween.