Battery Cell Insulation Venting for Thermal Runaway Pressure Relief
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Solution Overview
Problem
Existing battery cells face safety hazards due to obstruction of high-temperature and high-pressure substances during thermal runaway, leading to delayed pressure release and potential safety risks.
Innovation Solution
Incorporating a pressure relief mechanism with a weak portion in the insulating member and/or support plate to allow timely discharge of high-temperature and high-pressure substances, reducing obstruction and enhancing safety by forming channels for efficient pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to the entire outer surface of the current collector, then bonding strength is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The adhesive is applied selectively only to specific regions where tabs protrude from the electrode, rather than the entire outer surface. This localized application maintains bonding strength at critical points while reducing manufacturing complexity and adhesive material usage.
2Reliability
If adhesive is applied to the entire outer surface of the current collector, then bonding reliability is improved, but production time increases
Solution Approach 1:
By applying adhesive only to specific regions where tabs are located rather than the entire surface, the coating process is accelerated while maintaining reliable bonding at the critical tab connection points.
Solution Approach 2:
Instead of applying adhesive to the entire surface (excessive action), adhesive is applied only to the necessary regions where tabs protrude (partial action), reducing production time while achieving sufficient bonding reliability.
3Stability of the object's composition
If adhesive is applied to the entire outer surface of the current collector, then bonding uniformity is improved, but adhesive material consumption increases
Solution Approach 1:
Adhesive is applied uniformly only to the specific regions where tabs protrude from the electrode, rather than the entire surface. This ensures uniform bonding at critical locations while minimizing adhesive material consumption.
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 ensures timely and efficient discharge of high-temperature and high-pressure substances, improving safety by minimizing obstruction and reducing the risk of delayed pressure release.
Implementation Method 1
an adhesive layer is provided between the first current collector and the second current collector
Data Source
Figure 1~2
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AI summary
The embodiments of the present disclosure relate to a battery cell, a battery and an electricity consuming device. The battery cell includes a shell, a pressure relief mechanism, an electrode assembly and an insulating member. The pressure relief mechanism is disposed on the shell. The electrode assembly is accommodated within the shell. The insulating member is accommodated within the shell, at least a portion of the insulating member is located between the pressure relief mechanism and the electrode assembly, and a portion of the insulating member located between the pressure relief mechanism and the electrode assembly is provided with a first weak portion. The insulating member can insulate and isolate the pressure relief mechanism from the electrode assembly, to reduce a risk of the pressure relief mechanism conducting positive and negative electrodes of the electrode assembly, and by providing the first weak portion on the insulating member, it can reduce obstruction of the insulating member to high-temperature and high-pressure substances when thermal runaway occurs in the battery cell, so that the pressure in the battery cell can be released timely, thereby improving safety.