Pouch Battery Lead Support Structure for Vibration Durability
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Solution Overview
Problem
Secondary batteries face durability issues under vibration and impact due to the lack of a support structure for the electrode assembly, particularly in pouch-type batteries, where the connection between the electrode tab and lead weakens over time.
Innovation Solution
A secondary battery design that includes a support structure connected to electrode leads to firmly hold the electrode assembly, incorporating a heat-dissipating material and temperature sensors to manage internal temperature and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly is supported only by tab welding between the electrode and lead, then the structure is simple, but the durability under vibration and impacts is insufficient
Solution Approach 1:
A support structure is introduced as an intermediary component between the electrode assembly and the leads. This support structure includes a body portion that contacts the electrode assembly and lead-connected portions that connect to the leads, thereby mediating the mechanical connection and improving durability under vibration and impacts without directly modifying the welding process itself.
2Weight of moving object
If the tab is made thinner to reduce weight, then the weight decreases, but the connection strength between tab and lead weakens
Solution Approach 1:
The support structure serves as a mediator that compensates for the reduced strength of thinner tabs. By providing additional structural support through the body portion and lead-connected portions, the system can use thinner, lighter tabs while maintaining overall connection strength through the distributed support structure.
Solution Approach 2:
Instead of relying solely on the two-dimensional tab welding interface, the support structure introduces a three-dimensional framework that distributes mechanical loads across multiple points and dimensions, thereby compensating for the reduced cross-sectional area of thinner tabs.
3Quantity of substance
If the number of mono-cell stacks is increased to achieve high capacity, then the capacity increases, but the tab becomes thinner and the connection durability decreases
Solution Approach 1:
The support structure acts as a compensatory intermediary that offsets the weakening effect of thinner tabs caused by increased mono-cell stack density. The distributed support system ensures that each tab connection is reinforced, allowing the battery to achieve high capacity through increased stack numbers without sacrificing connection durability.
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 support structure enhances durability by stabilizing the electrode assembly against vibration and impact, while effectively cooling and monitoring internal temperature through heat dissipation and temperature sensing.
Implementation Method 1
the support may transfer the heat generated in the electrode assembly to the electrode lead to cool the surroundings through the heat dissipation
Data Source
AI summary
A secondary battery having an electrode assembly in which electrodes and separators are alternatively stacked; a pouch in which the electrode assembly is accommodated; a plurality of electrode leads connected to side portions of the electrode assembly and extending outside of the pouch; and a support configured to connect the plurality of electrode leads.