Battery Pack Protective Plate With Recessed Venting Channels
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Solution Overview
Problem
Existing battery cell bottom protection solutions are unsuitable for blade-style battery cells with bottom-mounted explosion-proof valves, as they can squeeze and damage the valve, lack effective exhaust channels for thermal runaway gases, and have seal failures due to bolt and gasket connections.
Innovation Solution
A protective plate with exhaust portions and connecting portions that face and guide high-pressure gas away from the explosion-proof valve, using a bonded connection and recessed structure to avoid valve damage, and incorporate a high-temperature resistant and fireproof layer to manage thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a flat metal bottom guard plate is used for battery cell module protection, then structural protection is provided, but the explosion-proof valve can be squeezed and damaged due to lack of recessed structure
Solution Approach 1:
The explosion-proof valve is nested within a recessed structure formed by the exhaust portion on the protective plate. The recessed structure accommodates the explosion-proof valve, preventing direct contact and squeezing between the protective plate and the valve, thereby avoiding damage while maintaining protective function.
2Strength
If a flat metal bottom guard plate is used, then protection is provided, but thermal runaway gases cannot be effectively directed away due to lack of exhaust channels
Solution Approach 1:
The protective plate is segmented into multiple functional regions: connecting portions for structural attachment, exhaust portions forming recessed structures that accommodate explosion-proof valves, and shielding members that direct thermal runaway gases. This segmentation allows the plate to simultaneously provide mechanical protection and effective gas diversion.
Solution Approach 2:
The exhaust portion acts as an intermediary structure between the explosion-proof valve and the external environment. It provides a controlled pathway for thermal runaway gases to escape while the shielding member mediates the direction of gas flow away from sensitive areas.
3Strength
If bolts and gaskets are used to connect the protective plate to the battery cell module, then secure attachment is achieved, but seal failure occurs easily under impact
Solution Approach 1:
The mechanical connection system using bolts and gaskets is replaced with a bonded connection system. The protective plate is bonded directly to the battery cell module using adhesive, eliminating the mechanical fasteners and gaskets that are prone to failure under impact, while maintaining secure attachment.
4Strength
If the protective plate directly contacts the explosion-proof valve, then structural support is provided, but the fragile valve cracks and leaks under minor deformation
Solution Approach 1:
The explosion-proof valve is nested within a recessed structure formed by the exhaust portion on the protective plate. The recessed structure accommodates the explosion-proof valve, preventing direct contact and squeezing between the protective plate and the valve, thereby avoiding damage while maintaining protective function.
Data Source
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AI summary
The present application relates to the field of battery pack protective structures, and more particularly to a protective plate, a housing, and a battery pack. The main body is provided with a plurality of exhaust portions and a plurality of connecting portions, and the plurality of exhaust portions and the plurality of connecting portions are sequentially and alternately provided in a first direction; each of the exhaust portions is formed into a recessed structure passing through opposite end portions of the main body in a second direction, and each of the connecting portions is provided with a cavity passing through the opposite end portions of the main body in the second direction; when the main body is connected to a battery cell module, the connecting portions are bonded to the battery cell module, and the openings of the exhaust portions face an explosion-proof valve of the battery cell module.