Pouch Battery Case Folding for Heat Dissipation and Energy Density
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Solution Overview
Problem
Conventional secondary batteries, particularly pouch-type batteries, face issues with adhesive tapes covering the outer surface, leading to thermal isolation, reduced durability, increased dimensions, and impaired heat dissipation, which affects energy density and safety.
Innovation Solution
A pouch-type battery design with a folded or rolled expansion portion and minimal adhesive application between the expansion and accommodation portions, allowing for efficient heat dissipation and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape is wrapped around the case to fix the expansion portion, then the expansion portion is securely attached to the cup portion, but heat dissipation is impaired and fire risk increases
Solution Approach 1:
The invention extracts and removes the adhesive tape from the battery case structure. Instead of using adhesive tape to attach the expansion portion to the cup portion, the patent employs mechanical attachment methods such as clips or snap-fit mechanisms, thereby eliminating the thermal insulation layer that impeded heat dissipation and reduced fire risk while maintaining secure attachment
Solution Approach 2:
The invention changes the attachment mechanism from chemical bonding (adhesive tape) to mechanical bonding (clips or snap-fit). This parameter change in the attachment method eliminates the adhesive layer that acted as a thermal insulator, allowing heat to dissipate efficiently from the battery case while maintaining reliable attachment of the expansion portion
2Reliability
If adhesive tape is wrapped around the case, then the expansion portion is fixed to the cup portion, but the dimensions of the battery increase
Solution Approach 1:
The invention extracts and eliminates the adhesive tape wrapping around the battery case. By removing this external layer, the overall dimensions of the battery are reduced, allowing for more compact battery designs and improved energy density in battery modules while structural integrity is maintained through alternative mechanical attachment methods
3Reliability
If adhesive tape is used to attach the expansion portion, then attachment is achieved, but durability decreases due to heat-induced adhesive degradation
Solution Approach 1:
The invention replaces the heat-sensitive adhesive tape with heat-resistant mechanical attachment components such as metal clips or polymer snap-fit mechanisms. These components are designed to withstand the thermal environment inside the battery case without degrading, thereby maintaining attachment function and structural integrity throughout the battery's service life
Solution Approach 2:
The invention changes the attachment mechanism from heat-sensitive adhesive bonding to heat-resistant mechanical bonding. The mechanical attachment components are selected to have high thermal stability, allowing them to maintain their attachment function even at elevated temperatures, thereby improving battery durability
4Reliability
If adhesive tape is wrapped around the case, then the expansion portion is secured, but energy density is reduced due to increased dimensions
Solution Approach 1:
The invention extracts and removes the adhesive tape layer from the battery case structure. This elimination of the external wrapping layer reduces the overall volume occupied by non-active components, thereby increasing the energy density of the battery while maintaining case structural stability through internal mechanical attachment mechanisms
Data Source
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AI summary
A battery (100) comprises: an electrode assembly (200), a case (110) including at least one accommodation portion (112) surrounding the electrode assembly (200) and an expansion portion (114) extending outwardly from the accommodation portion (112), wherein the expansion portion (114) is folded or rolled toward the accommodation portion (112) such that a contact surface (120) of the expansion portion (114) lies on the accommodation portion (112) facing the accommodation portion (112), and wherein an adhesive (120) is provided between the expansion portion (114) and the accommodation portion (112) and covers the contact surface (118) at least partially.