Movable Pressurization Member for Battery Cell Swelling
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Solution Overview
Problem
Secondary batteries, such as lithium secondary batteries, face issues with non-uniform pressure maintenance during use, leading to electrolyte leakage due to gas generation and swelling.
Innovation Solution
A battery module with a movable pressurization member, comprising a support member with sliding movement and stopper mechanisms, that adjusts to maintain uniform pressure on the battery cell stack, preventing electrolyte leakage by accommodating swelling and maintaining pressure within a safe range of 30 kgf to 80 kgf.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed pressurization structure is used, then the structure is simple, but the pressure cannot be uniformly maintained during battery swelling
Solution Approach 1:
The patent employs a movable pressurization member that can dynamically adjust its position and pressing force in response to battery cell swelling. The pressurization member is configured to move along the stacking direction of battery cells, allowing it to maintain uniform pressure distribution even as the battery expands during use. This dynamic adjustment capability resolves the contradiction by enabling reliable pressure maintenance without requiring an overly complex fixed structure.
Solution Approach 2:
The pressurization member is divided into multiple segments or pressing points that contact different battery cells individually. This segmentation allows each portion of the pressurization member to independently adjust to local swelling conditions, ensuring uniform pressure distribution across all battery cells. The segmented design achieves reliable pressure maintenance while keeping the overall structure relatively simple through modular construction.
2Reliability
If high pressure is applied to prevent electrolyte leakage, then leakage is prevented, but battery cell damage may occur
Solution Approach 1:
The patent implements a pressurization member with adjustable pressing force that can adapt to different battery states. The pressing force parameter is dynamically modified based on battery swelling程度, ensuring sufficient pressure to contain electrolyte while remaining below the threshold that would damage battery cells. This parameter adjustment capability resolves the contradiction by maintaining electrolyte containment reliability without compromising battery cell strength.
Solution Approach 2:
The pressurization system incorporates feedback mechanisms that monitor battery cell state and adjust pressing force accordingly. When battery cells swell, the system detects this change and modulates the pressurization force to maintain optimal pressure levels - high enough to prevent electrolyte leakage but low enough to avoid cell damage. This feedback control resolves the contradiction by balancing electrolyte containment and cell integrity based on real-time conditions.
3Adaptability or versatility
If the pressurization member is fixed, then the structure is stable, but it cannot accommodate battery swelling
Solution Approach 1:
The pressurization member is designed with dynamic characteristics, allowing it to move and adjust its position along the battery cell stacking direction. This mobility enables the pressurization member to accommodate battery swelling while maintaining stable contact pressure. The dynamic design resolves the contradiction by providing swelling adaptability without sacrificing structural stability, as the member returns to a stable pressed state once contact is established.
Solution Approach 2:
The pressurization member incorporates flexible elements or compliant structures that can deform and adapt to battery swelling while maintaining continuous contact. These flexible components allow the pressurization member to accommodate volume changes in battery cells while preserving the stability of the overall pressurization function. This flexible design resolves the contradiction by enabling swelling accommodation while maintaining pressurization stability.
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 movable pressurization member effectively maintains uniform pressure on battery cells, preventing electrolyte leakage and ensuring the safety and performance of the battery module by accommodating swelling and maintaining optimal pressure.
Implementation Method 1
a movable pressurization member for pressurizing the battery cell stack
Implementation Method 2
sliding movement members for moving the support member in directions opposite to directions in which the battery cell stack are pressurized
Implementation Method 3
a stopper member for stopping movement of the sliding movement members by stages
Data Source
AI summary
Disclosed herein is a battery module including a module case, a battery cell stack mounted in the module case, and a movable pressurization member for pressurizing the battery cell stack.