Lithium Battery Housing With Buffer Space and Cooling Slots
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Solution Overview
Problem
Lithium batteries face challenges in heat dissipation and internal pressure management, leading to reduced service life and safety concerns due to heat generation and gas accumulation during charging and discharging, which can cause deformation and separation of electrodes.
Innovation Solution
A heat dissipation structure featuring a metal housing with a large heat dissipation surface, a buffer space for electrode expansion, and cooling slots that communicate with the external environment to manage heat and maintain the battery's appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the battery core and electrode tabs are tightly enclosed in the metal housing, then the structural stability is improved, but the electrode tabs cannot expand or contract during charging and discharging, causing deformation and reduced service life
Solution Approach 1:
The metal housing is segmented into a fixed frame and a movable heat dissipation surface, creating a buffer space that allows electrode expansion while maintaining overall structural stability. The frame provides structural support while the heat dissipation surface can move independently to accommodate volume changes.
Solution Approach 2:
A buffer space is pre-formed between the frame and heat dissipation surface to accommodate the expansion and contraction of electrode tabs during charging and discharging cycles. This cushioning space prevents deformation of the battery cell by absorbing volume changes before they affect the overall structure.
2Reliability
If the metal housing is designed with tight sealing, then the protection against external factors is improved, but heat dissipation becomes difficult, leading to increased temperature and reduced service life
Solution Approach 1:
The metal housing has different structural characteristics in different regions: the frame provides sealed protection while the heat dissipation surface features cooling slots for thermal management. This local differentiation allows simultaneous achievement of protection and heat dissipation.
Solution Approach 2:
Cooling slots are incorporated into the heat dissipation surface to facilitate phase transition-based cooling (convection and radiation). The slots allow heat to be efficiently dissipated from the battery core through the metal housing to the external environment.
3Temperature
If cooling slots are added to the metal housing, then heat dissipation is improved, but the structural integrity and appearance are compromised
Solution Approach 1:
Cooling slots are localized to the heat dissipation surface rather than the entire housing structure. This allows effective heat dissipation through the slots while the frame maintains structural integrity. The slots are strategically positioned to maximize cooling efficiency with minimal impact on overall strength.
4Productivity
If the electrode tabs expand during charging and discharging, then the electrochemical performance is improved, but the battery cell deforms and the appearance of the electronic device is affected
Solution Approach 1:
A buffer space is pre-formed between the frame and heat dissipation surface to accommodate the expansion and contraction of electrode tabs during charging and discharging cycles. This cushioning space prevents deformation of the battery cell by absorbing volume changes before they affect the overall structure.
Solution Approach 2:
The metal housing is segmented into a fixed frame and a movable heat dissipation surface, creating a buffer space that allows electrode expansion while maintaining overall structural stability. The frame provides structural support while the heat dissipation surface can move independently to accommodate volume changes.
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 structure enables rapid heat dissipation and maintains the battery's appearance by accommodating electrode expansion and contraction, thereby enhancing the service life and safety of lithium batteries.
Implementation Method 1
a plurality of cooling slots is disposed on the frame and communicating with the buffer space and an external environment. Thus, heat is dissipated from the cooling slots to achieve the effect of rapid heat dissipation
Implementation Method 2
heat is dissipated from the cooling slots to achieve the effect of rapid heat dissipation
Implementation Method 3
The metal housing includes a heat dissipation surface having a large area contacting the battery core and a frame surrounding the heat dissipation surface
Data Source
AI summary
A heat dissipation structure of a lithium battery includes a battery cell and a metal housing. The battery cell includes a battery core and two electrode tabs. The metal housing includes a heat dissipation surface having a large area contacting the battery core and a frame surrounding the heat dissipation surface. A buffer space recessed toward the battery cell is formed between the frame and the heat dissipation surface. A plurality of cooling slots is disposed on the frame and communicate with the buffer space and an external environment. Therefore, the deformation space required for the expansion of the battery core is provided to keep the overall appearance of the battery cell, and the effects of uniform and rapid heat dissipation may be achieved.