Secondary Battery Shock-Absorbing Cap Design
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Solution Overview
Problem
Existing secondary battery cases lack effective shock absorption mechanisms, leading to potential damage from external impacts such as drops, which can compromise the integrity of the battery and its electrode assembly.
Innovation Solution
A case design incorporating a shock-absorbing cap with sub-shock absorbers, including grooves and connecting ribs, made from materials like polycarbonate, which distributes and transmits shock loads to the edges and ribs, reducing the contact area with the case body and thereby attenuating the shock before it reaches the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple case structure is used, then manufacturing cost and device complexity are reduced, but shock absorption capability deteriorates
Solution Approach 1:
The shock-absorbing cap is nested within the case body structure, forming an integrated protective system. The cap fits inside the case body's receiving space, creating a nested configuration where the inner cap provides shock absorption while the outer case body provides structural support, resolving the contradiction between simplicity and shock protection
Solution Approach 2:
The shock-absorbing cap with grooves is designed in advance to cushion shocks before they reach the electrode assembly. The grooves are pre-formed structural features that automatically absorb impact energy when shock occurs, providing beforehand cushioning without requiring active control or complex mechanisms
2Object-affected harmful factors
If shock-absorbing grooves are added to the cap, then shock distribution capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cap surface is segmented into multiple grooves that divide and distribute shock loads across different regions. This segmentation allows the shock to be dispersed into multiple smaller impact paths rather than concentrating force at one point, improving shock distribution while the grooves can be manufactured using standard molding techniques
Solution Approach 2:
The grooves are strategically positioned at specific locations on the cap where shock absorption is most needed. The local structural modification at groove locations provides enhanced shock distribution capability without requiring high precision throughout the entire cap structure, allowing standard manufacturing tolerances to suffice
3Object-affected harmful factors
If the shock-absorbing cap is made from elastic materials like rubber, then shock absorption is improved, but structural strength and rigidity deteriorate
Solution Approach 1:
The material properties of the cap are optimized by selecting polycarbonate with specific elastic modulus and impact resistance parameters. This parameter change allows the material to provide both shock absorption through elastic deformation and sufficient structural strength to maintain cap rigidity, resolving the contradiction between softness for shock absorption and hardness for structural integrity
Solution Approach 2:
The shock-absorbing cap is made from polycarbonate, a composite-like material that combines rigidity and elasticity properties. This material provides both the structural strength needed to maintain cap shape and the elastic properties needed to absorb shock, eliminating the need to choose between rubber (soft but weak) and rigid plastics (strong but brittle)
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 solution effectively absorbs and disperses shock loads, reducing the impact on the case body and electrode assembly, thereby enhancing the safety and durability of the secondary battery by localizing the shock transmission to specific areas, thus preventing damage.
Implementation Method 1
a sub-shock absorber, the sub-shock absorber being configured to distribute and transmit shock applied to the bottom of the shock-absorbing cap
Implementation Method 2
The shock-absorbing blocks may include an elastic body, the elastic body having an elasticity greater than an elasticity of the shock-absorbing case
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
A case for a secondary battery and a secondary battery including the same, the case including a case body, the case body having a bottom and a space for receiving an electrode assembly and a shock-absorbing cap, the shock-absorbing cap having a bottom and an edge extending from the bottom of the shock-absorbing cap, the edge being coupled to the bottom of the case body, wherein the shock-absorbing cap includes a sub-shock absorber, the sub-shock absorber being configured to distribute and transmit shock applied to the bottom of the shock-absorbing cap.