Battery Housing Volume Compensation Device for Pressure Management
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Solution Overview
Problem
Current battery systems face challenges with pressure fluctuations due to temperature changes, leading to potential sealing issues, corrosion, and the accumulation of moisture and gases, which can cause short-circuits and corrosion, especially in large batteries used in electric vehicles, where existing solutions like sealing compounds and dehumidifying elements are either ineffective or require frequent replacement.
Innovation Solution
A volume compensation device is integrated into the storage housing to manage pressure differences without material exchange, using components like expansive balloons, bellows, or movable housing lids to maintain a sealed environment, and a valve system to safely discharge excess gases, ensuring permanent impermeability and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery housing is hermetically sealed to prevent moisture and gas ingress, then protection against corrosion and short-circuits is improved, but pressure fluctuations due to temperature changes cause sealing failures and reduce service life
Solution Approach 1:
The patent employs flexible membranes (such as elastic membranes or bellows) as pressure compensation elements that can deform to accommodate pressure changes while maintaining the hermetic seal. These flexible elements absorb expansion and contraction forces caused by temperature fluctuations, preventing stress concentration on rigid seals and maintaining sealing integrity throughout the battery's service life.
2Reliability
If sealing compounds are used to fill dead volume between cells, then sealing effectiveness is improved, but mass and cost increase significantly
Solution Approach 1:
The patent extracts the sealing function from the bulk sealing compounds and concentrates it into specific membrane elements positioned at critical locations. Instead of filling the entire dead volume with heavy sealing material, thin membrane barriers are placed only where sealing is necessary, dramatically reducing the amount of sealing material required while maintaining effective protection.
Solution Approach 2:
The patent replaces bulky sealing compounds with thin flexible membrane films that provide equivalent or superior sealing performance. These thin films have minimal mass compared to conventional sealing compounds, reducing the overall battery system weight while maintaining hermetic protection against moisture and gases.
3Reliability
If dehumidifying elements are installed to prevent moisture accumulation, then protection against corrosion is improved, but these elements require frequent replacement and increase device complexity
Solution Approach 1:
The patent converts the harmful effect of pressure fluctuations into a beneficial function by using the same pressure changes to drive breathable membrane operation. The membranes allow controlled gas exchange that prevents moisture accumulation through passive diffusion and pressure-driven ventilation, eliminating the need for active dehumidifying elements and their associated maintenance requirements.
4Ease of manufacture
If round cells are used in the battery housing, then ease of manufacture is improved, but dead volume increases significantly
Solution Approach 1:
The patent uses flexible membranes to fill and seal the irregular dead spaces between round cells and the housing walls. These membranes conform to the complex geometries created by cylindrical cells, completely utilizing the available volume while maintaining hermetic sealing, thereby minimizing wasted space without requiring changes to the round cell design.
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 solution effectively compensates for pressure fluctuations, prevents moisture and gas ingress, and safely manages excess gases, enhancing the reliability and longevity of battery systems by maintaining a sealed environment and reducing the risk of corrosion and short-circuits.
Implementation Method 1
a volume compensation device, which compensates pressure differences between the interior of the storage housing and the surroundings without a material replacement between surroundings and interior of the storage housing, is assigned to the storage housing
Implementation Method 2
temperature fluctuations. They are critical in particular for the sealing of the cells, which are installed in the battery
Implementation Method 3
a valve system to safely discharge excess gases, ensuring permanent impermeability and preventing corrosion
Data Source
AI summary
An electrochemical energy storage device provides problem-free pressure compensation at a permanently high impermeability, includes a storage housing (1), which encases a volume, in which cells are accommodated, wherein the storage housing (1) protects the volume from the surroundings, and includes a volume compensation device (2), which compensates pressure differences between the interior of the storage housing (1) and the surroundings without a material replacement between the surroundings and the interior of the storage housing (1).