Bipolar Battery Electrolyte Inlet Structure to Prevent Separator Deformation
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Solution Overview
Problem
Conventional lead-acid storage batteries face issues with uniform contact between positive and negative active material layers due to separator deformation during electrolyte solution injection, leading to potential short circuits and reduced battery capacity.
Innovation Solution
A bipolar storage battery design featuring a through hole with a unique flow path to manage electrolyte solution injection, preventing separator deformation and ensuring uniform contact between active material layers, while allowing for efficient injection and reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection amount per unit time is increased to shorten the takt time of the assembly, then the productivity is improved, but the separator may be deformed by the pressure at the time of injecting the electrolyte solution, leading to non-uniform contact and potential short circuits
Solution Approach 1:
The patent introduces a pressure equalization chamber as an intermediary between the electrolyte solution storage and the separator. This chamber allows the electrolyte solution to be injected at high speed while the pressure is equalized before reaching the separator, preventing deformation. The intermediary chamber decouples the high-speed injection process from the delicate separator, enabling both high productivity and reliable uniform contact.
2Productivity
If the momentum of injection is strong to ensure quick filling, then the productivity is improved, but the injected electrolyte solution may cause unexpected shortening of the life of the storage battery due to influence on other components
Solution Approach 1:
The patent employs a pressure equalization chamber that acts as a cushioning buffer before the electrolyte solution contacts the battery components. This chamber absorbs and dissipates the injection momentum beforehand, allowing rapid filling while protecting the separator and other components from damaging high-pressure impacts that would reduce battery lifespan.
3Reliability
If the separator is used to bring electrolyte solution into contact with active material layers, then the battery function is achieved, but the separator may be deformed by injection pressure, causing short circuits between positive and negative electrode sides
Solution Approach 1:
The pressure equalization chamber serves as a protective intermediary that decouples the electrolyte solution injection process from the separator. This allows the separator to perform its essential function of bringing electrolyte into contact with active material layers while being protected from the harmful high-pressure injection forces that would cause deformation and short circuits.
Data Source
AI summary
The occurrence of a short circuit inside a cell member is prevented by means of a through hole formed to prevent an influence on components, such as deformation of a separator, inside a space housing the cell member caused by an injected electrolyte solution, while also considering ease of the injection. A battery includes cell members stacked and arranged with spacing, each including a positive electrode, a negative electrode, and a separator. The battery includes a space forming member, and a through hole open inside a space housing the cell member. The through hole includes an outer opening connected to an inner opening by a through path, and a wall portion in at least part of the through path. The wall portion makes an electrolyte solution have a different flow direction when flowing in from the outer opening compared to flowing from the inner opening into the space.