Sealed Pouch Battery Terminal Cooling for Heat-Resistant Sealing
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Solution Overview
Problem
Pouch batteries used for engine starting experience a decrease in sealing performance due to heat generated by large currents, which can lead to melting of the terminal bonding portion and electrolyte leakage.
Innovation Solution
A sealed battery design featuring lead terminals with a conduction section that contacts the case directly or indirectly via an intermediate layer, combined with a case and electrode assembly having thermal conductivities that facilitate heat dissipation, preventing the adhesive layer from melting and maintaining sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a pouch battery is used for engine starting, then large power output is achieved, but heat generation causes terminal bonding portion melting and sealing performance deterioration
Solution Approach 1:
The patent introduces a cooling plate as an intermediary component between the lead terminal and the case. This cooling plate acts as a heat transfer mediator, conducting heat away from the lead terminal to the case, thereby preventing excessive heat accumulation at the bonding portion while maintaining the high power output capability
Solution Approach 2:
The patent replaces the conventional thermal management approach with a structured cooling system. Instead of relying on natural heat dissipation, the cooling plate creates an active thermal conduction path, substituting passive thermal behavior with engineered thermal management to handle the high current conditions
2Reliability
If a terminal bonding tape is used to improve sealing, then sealing performance is enhanced, but heat from lead terminal melts the bonding tape
Solution Approach 1:
The cooling plate serves as a thermal intermediary that intercepts heat from the lead terminal before it reaches the terminal bonding tape. By providing an alternative heat dissipation path through the case, the cooling plate protects the bonding tape from melting while maintaining reliable sealing
Solution Approach 2:
The cooling plate is positioned in advance to prevent heat accumulation at the bonding portion. This proactive thermal management approach cushions against the harmful thermal effects before they can damage the sealing structure, ensuring continuous reliable operation
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 design effectively dissipates heat from the lead terminals, preventing adhesive layer melting and maintaining the battery's sealing performance even under high current discharge, thus preventing electrolyte leakage and ensuring reliable operation.
Implementation Method 1
the conduction section is provided to be at least partially in contact with an outer surface of the case directly or to be at least partially in contact with the outer surface of the case indirectly via an intermediate layer
Implementation Method 2
the case has a conductivity or an apparent thermal conductivity of from 10 W/(m·K) to 250 W/(m·K) inclusive, and the electrode assembly and the electrolyte contained in the case have an effective thermal conductivity of from 10 W/(m·K) to 100 W/(m·K) inclusive
Data Source
AI summary
A sealed battery according to the present invention includes an electrode assembly including a positive electrode, a negative electrode, and a separator; an electrolyte; a case; a first lead terminal; and a second lead terminal, wherein each of the first and second lead terminals includes an electrode connection section, an external connection section, and a sealing section, the first or the second lead terminal includes a conduction section, the conduction section is provided to be at least partially in contact with an outer surface of the case directly or indirectly, the case has a conductivity or an apparent thermal conductivity of from 10 W/(m·K) to 250 W/(m·K) inclusive, and the electrode assembly and the electrolyte contained in the case have an effective thermal conductivity of from 10 W/(m·K) to 100 W/(m·K) inclusive in a steady state.