Battery Cell Gas Venting via Segmented Flow Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery cell designs face issues with thermal runaway, where high-temperature gas or flames can burn terminal posts and cause secondary harm, and poor communication between the inner cavity and explosion-proof hole leads to inadequate gas flow and explosion-proofing.
Innovation Solution
A battery cell design featuring a housing with a main gas passage and branch passages that facilitate smooth gas flow, an explosion-proof valve positioned to cover the explosion-proof hole, and an electrode core spaced apart from the hole to prevent blockage, ensuring effective gas discharge and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the explosion-proof valve is arranged on the same end as the terminal post, then the structure is simplified, but the terminal post is vulnerable to burning from ejected high-temperature gas or flame during thermal runaway
Solution Approach 1:
The battery cell structure is segmented into distinct functional zones: the terminal post is located at one end while the explosion-proof valve is positioned at the opposite end. This spatial segmentation isolates the terminal post from the harmful effects of thermal runaway, preventing burning and secondary harm while maintaining structural clarity.
2Object-affected harmful factors
If the explosion-proof valve is positioned away from the terminal post, then the terminal post is protected from thermal runaway effects, but the inner cavity and explosion-proof hole have poor communication, blocking gas flow
Solution Approach 1:
A communication passage is introduced as an intermediary channel connecting the inner cavity to the explosion-proof hole. This passage ensures smooth gas flow from the inner cavity through the explosion-proof hole to the external environment, maintaining effective explosion-proofing while protecting the terminal post from thermal runaway effects.
3Volume of stationary object
If the electrode core directly abuts against the boss, then the structure is compact, but the explosion-proof hole is blocked and gas cannot flow normally
Solution Approach 1:
The electrode core is extracted from direct contact with the boss and repositioned to be spaced apart from the explosion-proof hole. This extraction prevents blockage of the explosion-proof hole, ensuring unobstructed gas flow from the inner cavity to the external environment while maintaining compact overall structure.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A battery cell (1), a battery pack (2) and a vehicle (4). The battery cell (1) comprises: a first recess (140) and a plurality of second recesses (150) that are constructed on the inner wall surface of a second side wall (130) and are concave in the direction facing away from an inner cavity (110) the first recess (140) forms an inner main air passage (141) in the inner cavity (110), the plurality of second recesses (150) form a plurality of branch air passages (151) in the inner cavity (110), the plurality of branch air passages (151) are separately communicated with the main air passage (141), the second side wall (130) is provided with an explosion-proof hole (160) corresponding to the position of the main air passage (141); an explosion-proof valve (300) mounted on the second side wall (130); and an electrode core (400) provided in a housing (100) and spaced apart from the explosion-proof hole (160).