Conductivity Section in Ion-Conducting Separator for Battery Overcharge Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrochemical energy storage modules face challenges in maintaining uniform states of charge across individual energy stores due to manufacturing variations and operational changes, leading to capacity scatter and potential damage from overcharging or excessive discharging, which conventional methods cannot fully prevent without reducing system flexibility and efficiency.
Innovation Solution
Incorporating an ion-conducting separator with a conductivity section and insulation section, where the conductivity section has higher electronic conductivity than the insulation section, allowing for the formation of a current bridge between the anode and cathode materials, enabling equalization of states of charge and preventing overcharging or excessive discharging through controlled leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional charging methods are used without overcharge protection, then charging speed and productivity are improved, but the risk of overcharging and damage to individual energy stores increases
Solution Approach 1:
The energy store performs its own overcharge protection through internal leakage current mechanisms. When the state of charge reaches a critical level, the leakage current automatically equalizes the charge between anode and cathode materials, preventing overcharging without requiring external monitoring or control systems.
Solution Approach 2:
The conductivity section provides continuous feedback about the state of charge through leakage current. The leakage current increases as the state of charge increases, creating a natural feedback mechanism that prevents further charging when the energy store reaches its maximum capacity, thereby protecting against overcharge while maintaining high charging speeds.
2Reliability
If the smallest capacity energy store dictates the maximum useful capacity of the entire string, then reliability of individual stores is improved, but the overall system capacity and productivity are reduced
Solution Approach 1:
Each energy store in the string independently protects itself through its internal leakage current mechanism. This self-service capability allows each store to maintain its own state of charge within safe limits, preventing any single store from being overcharged or undercharged, thereby enabling the entire string to operate at its maximum potential capacity without compromising individual store reliability.
3Reliability
If additional circuitry is added for overcharge protection, then reliability is improved, but device complexity increases
Solution Approach 1:
The energy store uses its own internal components (conductivity section, anode material, cathode material, and electrolyte) to perform overcharge protection without requiring any additional external circuitry. The leakage current mechanism is inherent to the energy store's construction, eliminating the need for separate protection circuits, sensors, or control electronics.
Solution Approach 2:
The conductivity section serves multiple functions: it provides structural support as part of the separator, enables ion conduction between electrodes, and simultaneously performs overcharge protection through leakage current generation. This multi-functionality integrates the protection mechanism into the existing energy store architecture without adding separate components.
4Ease of manufacture
If manufacturing variations cause scatter in capacity and state of charge, then ease of manufacture is improved, but uniformity of states of charge across the module deteriorates
Solution Approach 1:
Each energy store independently equalizes its own state of charge through internal leakage current, compensating for manufacturing variations. This self-service mechanism ensures that even if energy stores have different initial capacities or states of charge due to manufacturing tolerances, they will all converge to uniform states of charge during operation, maintaining module stability without requiring precise manufacturing control.
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
This solution ensures that all energy stores in a series-connected module reach their lowest permissible state of charge simultaneously, reducing the risk of irreversible damage and extending the service life by maintaining uniform states of charge and preventing overcharging.
Implementation Method 1
in the top region of the ion-conducting separator, one or at least one conductivity section is provided which, in the normal operation of the electrochemical energy store, has a higher electronic conductivity than an electronically-insulating insulation section in the base region
Implementation Method 2
an ion-conducting separator, which separates the anode space from the cathode space
Implementation Method 3
an electrochemical energy store with an anode, which is electrically connected to an anode space in which an anode material with a first fill level is arranged, and a cathode, which is electrically connected to a cathode space in which a cathode material with a second fill level is arranged
Data Source
AI summary
An electrochemical energy store with an anode, which is electrically connected to an anode space in which an anode material with a first fill level is arranged, and a cathode, which is electrically connected to a cathode space in which a cathode material with a second fill level is arranged, and an ion-conducting separator, which separates the anode space from the cathode space. The ion-conducting separator has a top region and a base region, wherein at least one conductivity section is provided in the top region of the ion-conducting separator, which conductivity section has greater electrical conductivity during correct operation of the electrochemical energy store than an electrically insulating insulation section in the base region, wherein at least one state of charge of the electrochemical energy store exists in which the anode material makes contact with the conductivity section in the anode space.