Electrode Tab Configuration and Nickel Content for Battery Thermal Management
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Solution Overview
Problem
Lithium-ion batteries experience excessive temperature rise during high-rate discharge, affecting battery life and safety.
Innovation Solution
An electrochemical apparatus with specific configurations, including a positive electrode tab and active material layer, where the number of tabs to layers of positive electrode plates is balanced (0.25≤a/b≤1.25), nickel molar percentage is ≥60%, and active material layer thickness is 10µm≤h1≤30µm, enhancing lithium-ion battery safety and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the positive electrode active material layer thickness is increased to improve capacity, then the battery capacity increases, but the temperature rise during high-rate discharge increases
Solution Approach 1:
The patent optimizes the thickness of the positive electrode active material layer to a specific range (10-30 μm) to balance capacity and heat generation. This parameter optimization ensures sufficient active material for capacity while maintaining thin enough layers to reduce internal resistance and heat generation during high-rate discharge.
2Quantity of substance
If the nickel content in positive electrode active material is increased to improve capacity and voltage, then the energy density increases, but the thermal stability and safety deteriorate
Solution Approach 1:
The patent sets the nickel molar percentage in the positive electrode active material to be 60% or more, optimizing the composition to achieve high energy density while maintaining acceptable thermal stability through controlled nickel content.
Solution Approach 2:
The patent uses composite positive electrode active materials containing nickel-based compounds (such as nickel cobalt manganese oxide or nickel cobalt aluminum oxide) combined with other metals to achieve high energy density while improving thermal stability and safety through the synergistic effects of multiple materials.
3Temperature
If the number of positive electrode tabs is increased to reduce current density and temperature rise, then the temperature control improves, but the device complexity increases
Solution Approach 1:
The patent optimizes the number of positive electrode tabs to be within 5-40 tabs, balancing the current distribution to reduce temperature rise during high-rate discharge while avoiding excessive complexity in manufacturing and assembly.
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
Effectively reduces temperature rise during high-rate discharge, improving safety and stability by optimizing the number of tabs, nickel content, and active material layer thickness.
Implementation Method 1
the positive electrode active material layer includes a positive electrode active material
Implementation Method 2
the current lithium-ion batteries tend to have a rapid temperature rise during high-rate discharge
Data Source
Figure 1~2
Figure 3~4
AI summary
The electrochemical apparatus in this application includes an electrode assembly, a positive electrode tab, and a negative electrode tab. In the electrode assembly, a separator is disposed between a positive electrode plate and a negative electrode plate. The positive electrode tab is connected to the positive electrode plate, and the negative electrode tab is connected to the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer disposed on its surface. The number a of the positive electrode tabs and the number b of layers of the positive electrode plate satisfy the relationship 0.25≤a/b≤1.25. A molar percentage X of nickel in the positive electrode active material satisfies the relationship X≥60%. A thickness h1 of the positive electrode active material layer satisfies: 10µm≤h1≤30µm. Increasing the number of positive electrode tabs can effectively reduce the current density of an individual positive electrode tab, reducing the thickness of the positive electrode active material layer can shorten a lithium-ion transport distance, and increasing the molar percentage of nickel in the positive electrode active material layer can enhance the energy density of the electrochemical apparatus, thereby effectively reducing the temperature rise of the electrochemical apparatus during high-rate discharge.