Power Battery Top Cover Deformable Plate Pressure Relief
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Solution Overview
Problem
Existing power battery designs face challenges in minimizing internal space occupation to accommodate increasing energy density demands while ensuring overcharging protection, as current solutions like the Current Interrupt Device (CID) occupy valuable space.
Innovation Solution
A top cover design for power batteries incorporating a current interrupt plate and a deformable plate, where the deformable plate is connected to the connecting plate and configured to uncouple from the current interrupt plate when internal pressure exceeds a reference, effectively sealing the assembling hole and reducing the protection structure's footprint within the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Current Interrupt Device (CID) with deformable plate and conductive plate is provided in the main circuit, then overcharging protection is achieved, but internal space of the battery is occupied
Solution Approach 1:
The patent extracts the protection function from the internal battery circuit by integrating the current interrupt plate and deformable plate onto the top cover plate, which is located outside the battery's internal volume. This allows the protection mechanism to operate externally, freeing up internal space while maintaining overcharging protection functionality.
Solution Approach 2:
The invention relocates the protection structure from the internal three-dimensional space to the external surface of the top cover plate, effectively utilizing the external dimensional space. The current interrupt plate is arranged on the top cover plate with the deformable plate positioned to engage with it from the battery interior, creating a spatial separation between the protection mechanism and the battery's internal volume.
2Reliability
If protection components are placed inside the battery, then overcharging protection is ensured, but energy density is reduced
Solution Approach 1:
The protection components (current interrupt plate and deformable plate) are extracted from the battery's internal volume and relocated to the top cover plate. This extraction eliminates the volume occupation that would otherwise reduce the space available for active materials, thereby maintaining higher energy density while ensuring protection functionality.
Solution Approach 2:
The protection mechanism is transitioned from occupying internal three-dimensional space to being integrated on the external surface of the top cover plate. This dimensional relocation allows the battery's internal volume to be fully utilized for energy storage, maximizing energy density without compromising protection.
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 design significantly reduces the internal space occupied by the protection structure, enhancing energy density by relocating the protection components outside the battery's internal volume, thus improving the battery's energy storage capacity.
Implementation Method 1
the deformable plate is configured to uncouple from the current interrupt plate when an internal pressure of the power battery goes beyond a reference pressure
Data Source
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AI summary
The present application relates to the field of energy storage devices and, particularly, relates to a top cover for power battery and a power battery. The top cover for a power battery includes a top cover plate, a first electrode unit and a second electrode unit, the first electrode unit includes a connecting plate, a deformable plate, an insulating piece and a current interrupt plate, an assembling hole is formed in the top cover plate, the current interrupt plate in direct contact with the top cover plate, the connecting plate is insulated from the top cover plate through the insulating piece and is formed with an accommodating chamber facing to the assembling hole, the deformable plate is attached to the connecting plate and is electrically connected with the current interrupt plate, the second electrode unit is electrically insulated from the top cover plate, and the deformable plate is configured to uncouple from the current interrupt plate when an internal pressure of the power battery goes beyond a reference pressure. The power battery includes the power battery top cover. The power battery of the present application can significantly reduce the inner space of the power battery occupied by the protection structure.