Current Collecting Plate Buffer Structure for Battery Expansion Pressure
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Solution Overview
Problem
The structural design of current collecting plates in cylindrical lithium-ion batteries is inadequate for releasing expansion pressure during thermal runaway, compromising safety.
Innovation Solution
A current collecting plate with a plate body and buffer parts, where the buffer parts are bent to form abutment parts that protrude from the plate body and abut against the housing, and a weak part connects adjacent buffer parts, allowing for pressure absorption and release when the battery cell expands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the current collecting plate uses a rigid structure to maintain structural strength, then the plate body can maintain its shape and provide stable current collection, but it cannot release expansion pressure when the battery cell expands during thermal runaway
Solution Approach 1:
The current collecting plate is divided into a rigid plate body for current collection and separate buffer parts for pressure absorption. The buffer parts are connected to the plate body through weak parts that can break under excessive pressure, allowing the buffer parts to deform and absorb expansion pressure while the main plate body remains intact for continued current collection.
Solution Approach 2:
Buffer parts are pre-installed on the current collecting plate with weak connections designed to fail at predetermined pressure thresholds. These buffer parts act as sacrificial elements that absorb expansion pressure before it can damage the battery housing or compromise the main current collecting structure, providing beforehand protection against thermal runaway damage.
2Device complexity
If the current collecting plate uses a simple structure to reduce manufacturing complexity, then production cost and time are reduced, but the ability to provide expansion space and release pressure during thermal runaway is insufficient
Solution Approach 1:
The current collecting plate is divided into a rigid plate body for current collection and separate buffer parts for pressure absorption. The buffer parts are connected to the plate body through weak parts that can break under excessive pressure, allowing the buffer parts to deform and absorb expansion pressure while the main plate body remains intact for continued current collection.
Solution Approach 2:
The buffer parts are designed with flexible, deformable structures that can expand and absorb pressure during thermal runaway. These buffer parts act as flexible pressure-absorbing elements that sacrifice themselves to protect the rigid current collecting plate and battery housing from damage.
3Strength
If the buffer parts are strongly connected to the plate body to maintain structural integrity, then the current collecting plate maintains its strength, but the buffer parts cannot deform to absorb expansion pressure
Solution Approach 1:
Different parts of the current collecting plate have different connection strengths: the buffer parts are weakly connected to allow deformation and pressure absorption, while the main plate body maintains strong connections for structural integrity and current collection. The weak parts are strategically positioned only where needed for pressure relief.
Solution Approach 2:
Buffer parts are pre-installed on the current collecting plate with weak connections designed to fail at predetermined pressure thresholds. These buffer parts act as sacrificial elements that absorb expansion pressure before it can damage the battery housing or compromise the main current collecting structure.
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 design effectively absorbs and releases pressure generated by the battery cell's expansion, enhancing safety by preventing damage to the current collecting plate and ensuring stable power supply.
Implementation Method 1
one end of either of two adjacent ones of the buffer parts is connected through a weak part
Implementation Method 2
the bent buffer part can generate a deformation to absorb the pressure generated by the expansion of the battery cell
Implementation Method 3
the abutment part is protruded from a side of the plate body away from the battery cell, the abutment part abuts against the housing
Data Source
AI summary
A current collecting plate and a battery are provided in the present application, where the current collecting plate is applied to a battery including a battery cell and a housing, the current collecting plate includes a plate body and a buffer part, and at least two buffer parts are provided, each of the buffer parts is bent to form an abutment part, the abutment part is protruded from a side of the plate body away from the battery cell, the abutment part abuts against the housing, and one end of either of two adjacent ones of the buffer parts is connected through a weak part, and another end of the buffer part away from the weak part is connected with the plate body.