Power Storage Module Sealing Member for Alkaline Creep Prevention
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Solution Overview
Problem
In power storage devices, the alkaline creep phenomenon can cause electrolytic solutions to leak out, leading to potential short circuits between laminated modules, which existing technologies fail to adequately prevent.
Innovation Solution
A power storage device design that includes a conductive plate and a sealing member between adjacent modules, with the sealing member filling the gap between sealing bodies to prevent electrolyte leakage and ensure electrical isolation, and a cooling flow path in the conductive plate to manage heat dissipation while maintaining fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polypropylene layer is provided at the edge portion of the bipolar electrode to firmly fix the electrode and seal the electrolytic solution, then the sealing performance is improved, but the alkaline creep phenomenon causes the electrolytic solution to propagate through gaps and leak out, leading to potential short circuits
Solution Approach 1:
A sealing member made of alkali-resistant material is introduced as an intermediary component between adjacent power storage modules. This sealing member specifically prevents the electrolytic solution from propagating along the outer peripheral surface of the sealing body, thereby blocking the harmful alkaline creep phenomenon while maintaining the sealing function.
Solution Approach 2:
The sealing structure employs a composite approach by combining the original polypropylene sealing body with an additional sealing member made of alkali-resistant material. This composite sealing system leverages the complementary properties of both materials to achieve both sealing and alkaline resistance functions.
2Quantity of substance
If power storage modules are laminated to increase capacity, then the energy storage is improved, but the risk of short circuits between modules increases due to electrolytic solution propagation
Solution Approach 1:
The sealing structure is segmented into multiple functional components: the original sealing body and the additional sealing member. This segmentation allows each component to perform its specific function - the sealing body provides structural sealing while the sealing member provides alkaline resistance and electrical isolation, thereby preventing short circuits between laminated modules.
Solution Approach 2:
The sealing member acts as an intermediary barrier between adjacent power storage modules in the laminated structure. It specifically targets and blocks the propagation path of the electrolytic solution along the outer peripheral surface, ensuring electrical isolation while allowing the modules to remain closely laminated for compact energy storage.
3Reliability
If the sealing body surrounds the electrode laminate to seal the internal space, then the containment is improved, but electrolytic solution can still flow out to the outer peripheral surface and cause short circuits
Solution Approach 1:
The sealing member serves as a secondary intermediary layer that specifically addresses the harmful electrolyte flow on the outer peripheral surface. While the sealing body maintains internal space containment, the sealing member provides an additional protective barrier that intercepts and blocks electrolyte propagation before it can cause short circuits between modules.
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
Effectively suppresses the occurrence of short circuits by containing electrolyte leaks and facilitating reliable heat dissipation, ensuring the stability and performance of the power storage device.
Implementation Method 1
at least a part of the portion between the sealing bodies opposing each other is filled with the sealing member. Therefore, even when the electrolytic solution leaks from the internal space of the power storage module and flows out to the outer peripheral surface of the sealing body, in the portion filled with the sealing member, it is possible to suppress the entering of the electrolytic solution that propagates on the outer peripheral surface of the sealing body.
Implementation Method 2
a cooling flow path through which a cooling fluid flows may be formed in the conductive plate
Data Source
AI summary
A power storage device includes a plurality of power storage modules laminated, a conductive plate and a sealing member. The conductive plate and the sealing member are provided between the power storage modules adjacent to each other in a laminating direction of the power storage modules. The plurality of power storage modules each have an electrode laminate, an electrolytic solution, and a sealing body. The electrode laminate has electrode exposed portions exposed from the sealing body at one end and the other end in the laminating direction. Between the power storage modules adjacent to each other in the laminating direction, the conductive plate is disposed between the electrode exposed portions opposing each other to be in contact with the electrode exposed portions, and at least a portion between the sealing bodies opposing each other is filled with the sealing member.