Double-Frame Battery Module Structure for Cell Swelling Pressure
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Solution Overview
Problem
Conventional battery modules face challenges in withstanding the swelling pressure of battery cells due to the single-layer frame structure, which is prone to deformation during charge and discharge cycles.
Innovation Solution
A double frame structure is introduced, comprising a first frame with elastic member surfaces and a second frame that covers the battery cell stack, where the elastic member surfaces absorb swelling pressure, and the frames are coupled through welding for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer frame structure is used to cover the battery cell stack, then the device complexity is reduced and manufacturing is simplified, but the frame cannot withstand the swelling pressure of battery cells during charge and discharge cycles
Solution Approach 1:
The frame structure is divided into two separate layers: a first frame that directly contacts and contains the battery cell stack, and a second frame that provides additional structural support and houses the first frame. This segmentation allows each layer to specialize in different functions, with the first frame handling direct cell containment and the second frame providing enhanced swelling pressure resistance through its larger surface area and structural rigidity.
Solution Approach 2:
The dual-frame structure creates a composite structural system where two different frame configurations work together. The first frame (directly contacting cells) and second frame (outer housing) form a composite structure that combines the advantages of both designs: close fit and direct containment from the first frame, and enhanced strength and swelling pressure resistance from the second frame.
2Stability of the object's composition
If a single-layer frame structure is used, then the number of components is reduced, but the frame deforms under swelling pressure from battery cells
Solution Approach 1:
The frame is segmented into two distinct layers that perform different structural functions. The first frame provides direct containment with minimal clearance, while the second frame provides outer structural support and deformation resistance. This segmentation allows the system to maintain structural stability under swelling pressure without requiring a single overly complex monolithic structure.
Solution Approach 2:
The first frame is nested within the second frame, creating a hierarchical structure where the smaller first frame containing the battery cells is housed within the larger second frame. This nesting arrangement allows the inner frame to maintain close contact with cells while the outer frame provides additional structural stability and resistance to swelling-induced deformation.
3Strength
If elastic members are added to the frame structure to absorb swelling pressure, then the frame can withstand battery cell swelling, but the assembly process becomes more complex
Solution Approach 1:
The first frame is constructed with flexible side surfaces that can elastically deform to absorb swelling pressure from the battery cells. This flexibility allows the frame to accommodate cell expansion during charge-discharge cycles without requiring additional elastic members or complex adjustment mechanisms, thereby maintaining ease of manufacture while providing necessary pressure absorption.
Solution Approach 2:
The side surfaces of the first frame are designed with specific material properties and geometric parameters that enable elastic deformation. By carefully selecting the material composition, thickness, and cross-sectional geometry of the side surfaces, the frame achieves optimal elasticity to absorb swelling pressure while maintaining structural integrity and simplifying the assembly process.
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 double frame structure effectively prevents deformation of the battery module by absorbing swelling pressure, simplifies the assembly process, and reduces the number of components and assembly complications.
Implementation Method 1
the left surface and the right surface of the first frame are formed of an elastic member curved in the stacking direction
Implementation Method 2
coupling the first frame and the second frame through welding
Data Source
AI summary
A battery module includes a battery cell stack in which a plurality of battery cells are stacked, a first frame which is formed of a lower surface and left and right surfaces to cover a lower surface and left and right surfaces of the battery cell stack, and a second frame of which an upper surface, and front, rear, left and right surfaces are integrally formed to cover an upper surface and front and rear surfaces of the battery cell stack and the left and right surfaces of the first frame, and the left and right surfaces of the first frame are formed of an elastic member curved in a direction in which the battery cell stack is located.