Electrode Assembly Protective Layer for Tab Burr Isolation
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Solution Overview
Problem
Conventional protective layers on electrode tabs in batteries hinder ion passage, leading to reduced battery energy and potential short circuits due to tab burrs piercing the separator.
Innovation Solution
The electrode assembly features a first protective layer with holes allowing ion passage and a second protective layer blocking ions, arranged on the positive and negative electrode pieces to prevent short circuits while enabling electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wound rotor asynchronous motor is used, then the motor structure is simple and easy to manufacture, but the motor cannot achieve high starting torque and has poor speed regulation performance
Solution Approach 1:
The motor is divided into independent functional modules: a permanent magnet synchronous motor for high-speed operation and a wound rotor asynchronous motor for low-speed operation. This segmentation allows each motor to operate in its optimal performance range, achieving high starting torque through the permanent magnet synchronous motor while maintaining structural simplicity through modular design.
Solution Approach 2:
The dual-rotor structure enables the motor system to perform multiple functions: the permanent magnet synchronous motor provides high starting torque and speed regulation, while the wound rotor asynchronous motor handles high-speed operation. Both rotors share a common stator and magnetic circuit, allowing the system to adapt to different operational requirements without requiring separate motor systems.
2Reliability
If a permanent magnet synchronous motor is used, then high starting torque and speed regulation are achieved, but the cost of permanent magnet materials increases
Solution Approach 1:
The permanent magnet synchronous motor is designed with optimized magnetic circuit and flux distribution to maximize the utilization efficiency of permanent magnet materials. By concentrating magnetic flux in critical areas and improving pole arc coefficients, the design achieves high starting torque with reduced permanent magnet material quantity compared to conventional designs.
Solution Approach 2:
The motor employs composite material strategies by combining permanent magnet materials with optimized stator and rotor structures. The dual-rotor configuration allows the system to use permanent magnets only where most needed (in the synchronous motor portion), while the asynchronous motor portion uses conventional materials, reducing overall permanent magnet material consumption.
3Reliability
If dual rotors are designed, then high starting torque is achieved, but the magnetic circuit design complexity increases
Solution Approach 1:
The dual-rotor permanent magnet synchronous motor combines two motor functionalities into a single integrated magnetic circuit. Both the permanent magnet synchronous motor and wound rotor asynchronous motor share common stator windings, magnetic flux paths, and structural components. This merging approach achieves high starting torque through the permanent magnet portion while maintaining manageable design complexity through shared components and unified magnetic circuit architecture.
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
Improves battery energy and safety by allowing ion passage through the first protective layer while preventing tab burrs from piercing the separator, enhancing electrochemical reactions and preventing ion precipitation.
Implementation Method 1
a permanent magnet synchronous motor (100) having a stator (110) and a rotor (120), and a wound rotor asynchronous motor (200) having a stator (210) and a rotor (220), wherein the stator (110) of the permanent magnet synchronous motor (100) and the stator (210) of the wound rotor asynchronous motor (200) are integrated into one stator (110), and the rotor (120) of the permanent magnet synchronous motor (100) and the rotor (220) of the wound rotor asynchronous motor (200) are integrated into one rotor (120, 220)
Implementation Method 2
the stator (110) of the permanent magnet synchronous motor (100) and the stator (210) of the wound rotor asynchronous motor (200) are integrated into one stator (110), and the rotor (120) of the permanent magnet synchronous motor (100) and the rotor (220) of the wound rotor asynchronous motor (200) are integrated into one rotor (120, 220)
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
Provided are an electrode assembly and a battery. The electrode assembly includes a positive electrode piece, a negative electrode piece and a first protective layer (500) arranged on the surfaces of the positive electrode piece and the negative electrode piece; and in a projection plane based on a length direction and a width direction of the electrode assembly, an orthographic projection of the first protective layer (500) in the projection plane covers an orthographic projection of a first region (c) of a positive electrode tab (300) in the projection plane. The electrode assembly can take into account the energy of battery on the basis of preventing burrs of tab from piercing a separator.