Battery Cell Pressurizing Structure for Uniform Activation Pressure
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Solution Overview
Problem
Conventional battery cell pressurizing devices apply uneven pressurization forces, leading to lithium precipitation and increased defect rates due to pressurization deviations between the center and sides of battery cells.
Innovation Solution
A battery cell pressurizing device with independent pressurizing members for the central and side portions, utilizing servo motors and hydraulic cylinders to uniformly apply forces, and a control unit to compensate for minute displacements, ensuring consistent pressurization across all battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressurizing member is used to pressurize the central portion of the battery cell, then the device complexity is reduced, but the manufacturing precision deteriorates due to pressurization deviation between center and sides
Solution Approach 1:
The pressurizing device is divided into multiple independent pressurizing members: a first pressurizing member for the central portion, a second pressurizing member for one side portion, and a third pressurizing member for the other side portion. Each pressurizing member independently applies pressure to its designated region, eliminating the pressurization deviation that occurs with a single centralized pressurizing member.
Solution Approach 2:
Each pressurizing member is specifically configured to apply pressure to a particular local region of the battery cell (central or side portions). This localized pressurization approach ensures that each region receives the appropriate pressure independently, achieving uniform overall pressurization while maintaining structural simplicity through modular design.
2Manufacturing precision
If multiple pressurizing members are used to pressurize different portions independently, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The pressurizing device is divided into multiple independent pressurizing members: a first pressurizing member for the central portion, a second pressurizing member for one side portion, and a third pressurizing member for the other side portion. Each pressurizing member independently applies pressure to its designated region, eliminating the pressurization deviation that occurs with a single centralized pressurizing member.
Solution Approach 2:
Each pressurizing member is specifically configured to apply pressure to a particular local region of the battery cell (central or side portions). This localized pressurization approach ensures that each region receives the appropriate pressure independently, achieving uniform overall pressurization while maintaining structural simplicity through modular design.
3Productivity
If conventional pressurization is used, then the productivity is maintained, but the reliability deteriorates due to lithium precipitation and defect increase
Solution Approach 1:
The pressurizing device is divided into multiple independent pressurizing members that simultaneously pressurize different regions of the battery cell. This segmented approach ensures uniform pressure distribution throughout the cell, preventing lithium precipitation and eliminating the reliability issues associated with conventional non-uniform pressurization methods.
Solution Approach 2:
Each pressurizing member is specifically configured to apply pressure to a particular local region of the battery cell (central or side portions). This localized pressurization approach ensures that each region receives the appropriate pressure independently, achieving uniform overall pressurization while maintaining structural simplicity through modular design.
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 solution effectively reduces defect rates by uniformly pressurizing battery cells, minimizing lithium precipitation and maintaining consistent battery capacity, thereby stabilizing the activation process.
Implementation Method 1
a first pressurizing member pressurizing a central portion of the pressurizing plate; a second pressurizing member pressurizing one side portion based on the center of the pressurizing plate; a third pressurizing member pressurizing the other side portion based on the center of the pressurizing plate
Data Source
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AI summary
The present invention relates to a battery cell pressurizing device and a battery cell manufacturing method using the same, and more specifically, relates to a battery cell pressurizing device uniformly pressurizing a battery cell, and a battery cell manufacturing method using the same. According to one example of the present invention, a battery cell pressurizing device may be provided, which comprises: a first end plate located on one side; a second end plate facing the first end plate to be located on the other side; a pressurizing plate moving and pressurizing the first end plate in a direction where the plurality of battery cells is laminated so that the plurality of battery cells arranged between the first end plate and the second end plate is pressurized; a first pressurizing member provided to pressurize the central portion of the first end plate through the pressurizing plate by pressurizing the central portion of the pressurizing plate; and a second pressurizing member and a third pressurizing member provided to pressurize, based on the center of the first end plate, one side portion and the other side portion, respectively.