Battery Shell Recess for Pressure Relief Heat Impact Cushioning
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Solution Overview
Problem
In battery systems, thermal runaway can lead to heat diffusion posing a threat to the external environment, as existing fireproof structures are prone to damage and fail to effectively prevent heat transfer.
Innovation Solution
A battery design featuring a shell structure with a recessed area to create a cushion space between the pressure relief structure and the sidewall, which cushions the heat flow impact force and reduces the force exerted on the fireproof structure, thereby preventing damage and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fireproof structure is placed close to the battery cell to prevent heat diffusion, then heat protection effectiveness is improved, but the structure is more prone to damage from pressure relief impact
Solution Approach 1:
The patent introduces a cushioning space between the battery cell pressure relief structure and the fireproof structure. This space is designed to absorb and dissipate the impact force generated when the pressure relief structure bursts during thermal runaway, thereby protecting the fireproof structure from damage while maintaining its heat protection function.
Solution Approach 2:
The cushioning space acts as an intermediary element between the pressure relief structure and the fireproof structure. It mediates the impact force by providing a void space that allows the burst to occur without directly transmitting the full force to the fireproof structure, thus preserving both the pressure relief function and the structural integrity.
2Strength
If the distance between the pressure relief structure and the shell sidewall is increased to reduce impact force, then shell structure damage is reduced, but heat diffusion protection is compromised
Solution Approach 1:
The cushioning space is strategically positioned and sized to provide sufficient impact absorption while maintaining an overall compact structure. The space is large enough to reduce impact force on the shell but small enough to prevent excessive heat diffusion, achieving a balance between structural protection and thermal containment.
Solution Approach 2:
The recessed structure creates a localized cushioning zone specifically at the pressure relief area, while the rest of the shell structure maintains its heat protection function. This localized approach allows impact force reduction without compromising the overall heat diffusion prevention capability of the battery enclosure.
3Strength
If a recessed structure is added to create cushion space, then impact force cushioning is improved, but device complexity increases
Solution Approach 1:
The shell structure is segmented into a recessed portion and a non-recessed portion, creating the cushioning space without requiring separate components. This segmentation is achieved through molding or forming techniques that create the recessed structure as an integrated part of the shell, minimizing additional complexity while achieving the cushioning effect.
Solution Approach 2:
The recessed structure utilizes the depth dimension of the shell to create the cushioning space, rather than adding external components or increasing the overall battery dimensions. By exploiting the third dimension (depth/thickness) of the existing shell structure, the cushioning space is created without significantly increasing device complexity or external footprint.
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 design effectively cushions the heat flow impact force, reducing the risk of damage to the fireproof and shell structures, and prevents heat diffusion to the external environment, enhancing safety.
Implementation Method 1
when the pressure relief structure relieves pressure, an instantaneous heat flow impact force can be cushioned in the cushion space, thereby reducing a force exerted on the fireproof structure and the shell structure
Data Source
AI summary
A battery includes: a shell structure; and a battery cell, including a pressure relief structure. The shell structure includes a first sidewall oriented toward the pressure relief structure. A part of the first sidewall is recessed toward outside of the shell structure to form a recessed structure. An orthographic projection of the pressure relief structure toward the first sidewall at least partially falls within the recessed structure. A part of the first sidewall is recessed outward to form the recessed structure, and the orthographic projection of the pressure relief structure toward the first sidewall at least partially falls within the recessed structure.