Battery Cell Venting Layout for Controlled Gas Release
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Solution Overview
Problem
Existing battery technologies face challenges in precisely controlling gas discharge direction during swelling or thermal runaway, and in reducing the overall weight and volume of battery packs while improving energy density.
Innovation Solution
A battery cell design featuring a case with sealing portions and a venting portion that ruptures earlier to control gas discharge direction, combined with a battery cell cover that partially covers multiple cells to reduce weight and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the bonding force of sealing portion is reduced to vent gas, then gas discharge is enabled, but sealing performance deteriorates and gas discharge direction cannot be precisely controlled
Solution Approach 1:
The case is divided into sealing portions (with strong bonding) and venting portions (with weak bonding). This segmentation allows different regions to have different functions: sealing portions maintain hermetic sealing while venting portions enable controlled gas discharge when swelling or thermal runaway occurs.
Solution Approach 2:
Different bonding strengths are applied to different locations of the case. The venting portions are designed with specifically reduced bonding force compared to sealing portions, creating local quality differences that enable precise control of gas discharge direction while maintaining overall sealing integrity.
2Quantity of substance
If battery cells are densely disposed to increase energy density, then energy density improves, but gas discharge direction control becomes more difficult
Solution Approach 1:
The case edge is segmented into sealing portions and venting portions, allowing each battery cell to have its own dedicated venting path. This segmentation enables precise control of gas discharge direction even when cells are densely disposed, as each cell's venting portion independently directs gas away from adjacent cells.
3Ease of manufacture
If box-shaped metal case and battery module structure are used, then battery pack assembly is simplified, but overall weight and volume increase and energy density decreases
Solution Approach 1:
The battery cell cover integrates multiple functions: it serves as both a protective cover and a structural component of the battery pack assembly. By combining these functions into a single component, the number of parts is reduced, decreasing overall weight and volume while maintaining assembly simplicity.
Solution Approach 2:
The battery cell cover is designed as a multi-functional component that provides mechanical protection, structural support, and integration with the battery pack housing. This universality eliminates the need for separate protective cases and modules, reducing overall system weight and volume.
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 enables precise control of gas discharge direction, reduces the weight and volume of battery packs, and improves energy density, while also preventing serial thermal runaway and ensuring safety and reliability.
Implementation Method 1
the venting portion may be configured to rupture earlier than the sealing portion when gas pressure in the accommodation space increases
Data Source
AI summary
A battery cell includes a case configured to accommodate an electrode assembly in an accommodation space provided between a first case part and a second case part facing each other and an electrode lead having one end connected to the electrode assembly and the other end extending to the outside of the case. The case includes a sealing portion provided by bonding an edge of the first case part and an edge of the second case part to each other to seal the accommodation space and a venting portion provided in a portion of the case, excluding an edge portion where the sealing portion is provided.