Battery Tray Pressurization Structure for Pouch Cell Expansion Control
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Solution Overview
Problem
Existing battery formation processes face challenges in preventing excessive expansion of soft-packed lithium batteries during the formation process.
Innovation Solution
A pressurizing apparatus is employed, comprising a frame, pressurizing plate, pressure-bearing plate, partition plates, and springs, with a compressive force generation module and fixing module controlled by a controller to apply uniform external force, shaping the batteries and preventing expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If soft-packed lithium batteries are filled with chemical components in fluid state, then the batteries can be manufactured, but the batteries expand excessively during the formation process
Solution Approach 1:
The pressurizing apparatus applies a pre-compressive force to the battery tray before and during the formation process. This preliminary counteracting force prevents the chemical components from causing excessive expansion, while still allowing the formation reaction to proceed. The compressive force is applied through pressurizing plates and springs in a controlled manner.
Solution Approach 2:
The apparatus changes the physical parameters of the system by applying controlled compressive force. The pressure parameter is adjusted through the spring mechanism and pressurizing plates, transforming the uncontrolled expansion into a controlled compression state that maintains manufacturability while preventing excessive volume increase.
2Shape
If compressive force is applied to prevent battery expansion, then battery shape is maintained, but uniform distribution of force is difficult to achieve
Solution Approach 1:
The pressurizing apparatus divides the compressive force application into multiple segments. Multiple pressurizing plates are distributed across the battery tray, and multiple springs provide force at different locations. This segmentation ensures that the compressive force is uniformly distributed across the entire battery pack, preventing localized deformation while maintaining overall shape.
Solution Approach 2:
The apparatus achieves homogeneous force distribution through symmetric arrangement of pressurizing plates and springs. The design ensures that each region of the battery tray receives equivalent compressive force, creating a uniform pressure field that maintains battery shape without causing uneven stress concentration.
3Force
If pressurizing apparatus is designed with multiple components, then effective pressurization is achieved, but device complexity increases
Solution Approach 1:
The spring mechanism provides self-regulating compressive force. The springs automatically adjust to maintain consistent pressure without requiring complex control systems. The mechanical design allows the apparatus to self-adjust and maintain force, reducing the need for additional sensors, actuators, and control electronics that would increase complexity.
Solution Approach 2:
The pressurizing apparatus is designed with multi-functional components. The frame structure simultaneously provides mechanical support and mounting for pressurizing components. The pressurizing plates serve both as force transmission elements and as structural components. This multi-functionality reduces the total number of parts needed, simplifying the overall device structure while maintaining effective compressive force.
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 apparatus effectively shapes and stabilizes soft-packed lithium batteries by maintaining a consistent compressive force, ensuring efficient and uniform formation without excessive expansion.
Implementation Method 1
at least one spring arranged between the pressurizing plate and the pressure-bearing plate
Data Source
AI summary
A pressurizing apparatus for a battery tray is provided. The pressurizing apparatus includes a base, a compressive force generation module, a fixing module, and a controller. The compressive force generation module and the fixing module are arranged on the base. The controller is electrically connected to the compressive force generation module and the fixing module. The controller is configured to control the fixing module to be coupled between the compressive force generation module and the battery tray. The controller is configured to control the compressive force generation module to apply a compressive force to a pressure-bearing plate of the battery tray, so that the pressure-bearing plate pressurizes a pressurizing plate of the battery tray, thereby forming a containment on the batteries on a plurality of partition plates of the battery tray.