Battery Shielding Portion Redirects Gas Flow to Contain Fragments
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Solution Overview
Problem
During a nail penetration test on rechargeable batteries, the short-circuiting of electrodes leads to heat generation, decomposition of the electrolytic solution, and gas production, which can cause the pressure release valve to open, resulting in electrode fragments being scattered outside the case.
Innovation Solution
The design includes a layered electrode assembly with conductive members that have interposing and shielding portions to redirect the gas flow, lengthening the discharge path and preventing fragment scattering, while the shielding portions are made of materials that prevent corrosion and melting to ensure effective gas direction and fragment containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure release valve is designed to release pressure at a specific threshold, then the pressure release function is improved, but electrode fragments are scattered outside the case
Solution Approach 1:
A shielding plate is introduced as an intermediary component between the electrode assembly and the pressure release valve. This shielding plate intercepts electrode fragments carried by the discharged gas, preventing them from scattering outside the case while allowing the pressure release function to operate normally.
Solution Approach 2:
The invention converts the harmful effect of high-velocity gas discharge into a beneficial containment mechanism. The shielding plate utilizes the gas flow to carry fragments away from the pressure release valve opening, effectively using the discharge mechanism itself to prevent fragment scattering.
2Object-generated harmful factors
If the shielding portion is placed close to the pressure release valve, then fragment containment is improved, but gas flow path is blocked
Solution Approach 1:
The shielding plate is designed with spatially differentiated functionality: the first shielding portion is positioned to intercept fragments near the electrode assembly, while the second shielding portion is positioned to intercept fragments near the pressure release valve. This local differentiation allows effective fragment containment at multiple critical locations without completely blocking the gas discharge path.
Solution Approach 2:
The shielding plate extends in the stacking direction of the electrodes, creating a three-dimensional shielding structure that intercepts fragments in the vertical dimension while allowing gas flow to continue in the horizontal dimension toward the pressure release valve.
3Ease of manufacture
If the conductive member structure is simplified, then manufacturing is easier, but fragment scattering prevention is insufficient
Solution Approach 1:
The shielding plate is integrated with the conductive member, merging two functional components (electrical conduction and fragment shielding) into a single unified structure. This integration maintains the necessary electrical connectivity while adding fragment containment functionality without requiring separate assembly steps.
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
This configuration effectively prevents the scattering of electrode fragments from the pressure release valve during the nail penetration test by redirecting gas flow and ensuring the fragments fall back into the case, reducing the generation of sparks and maintaining the structural integrity of the battery.
Implementation Method 1
the shielding portion covers the pressure release valve from a side of the wall where the electrode assembly is located... the shielding portion redirects the gas flow, lengthening the discharge path and preventing fragment scattering
Implementation Method 2
ensuring the fragments fall back into the case, reducing the generation of sparks and maintaining the structural integrity of the battery
Data Source
AI summary
The electric storage device includes an electrode assembly having a positive electrode and a negative electrode, a case for housing the electrode assembly, a pressure relief valve, and positive and negative electrode conductive members that are electrically connected to the respective corresponding electrodes. The case has a wall in which the pressure relief valve is disposed. At least one of the positive and negative electrode conductive members includes an interposing portion located between the inner surface of the wall and an end face of the electrode assembly facing the inner surface, and a shielding portion located closer to the end face of the electrode assembly than the interposing portion. The shielding portion covers the pressure release valve from a side of the wall where the electrode assembly is located.