Battery Cell Terminal Assembly for Reversible Pressure Disconnect
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Solution Overview
Problem
Existing battery technologies face challenges in prolonging the service life due to irreversible deformation of pressure relief mechanisms during thermal runaway, leading to reduced utilization and safety concerns.
Innovation Solution
A battery cell design featuring a terminal assembly with a movable portion and elastic member, where the movable portion separates from the fixed portion under high internal pressure, releasing pressure and disconnecting the circuit, and returns to connect when pressure decreases, ensuring safe operation and prolonged service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief mechanism is used to release internal pressure during thermal runaway, then the safety of the battery cell is improved, but the mechanism undergoes irreversible deformation leading to reduced service life
Solution Approach 1:
The electrode terminal is designed with a movable portion that can dynamically change position between a first position (contacting the fixed portion) and a second position (separated from the fixed portion). This dynamic structure allows the terminal to automatically respond to internal pressure changes, moving to the second position when pressure increases during thermal runaway to disconnect the circuit, and returning to the first position when pressure decreases, thereby providing reversible pressure relief without irreversible deformation.
2Reliability
If the movable portion separates from the fixed portion to release internal pressure, then the safety during thermal runaway is improved, but the circuit connection is interrupted reducing utilization
Solution Approach 1:
The movable portion performs periodic movement between the first position and second position in response to periodic changes in internal pressure. During normal operation, the movable portion remains in the first position maintaining circuit connection. When thermal runaway occurs and internal pressure increases, it moves to the second position to disconnect the circuit for safety. When pressure decreases, it returns to the first position to restore connection, enabling the battery to continue working and maximizing utilization while ensuring safety.
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 manages internal pressure during thermal runaway, maintaining circuit integrity and extending the service life of battery cells by allowing safe pressure release without irreversible deformation.
Implementation Method 1
the elastic member is configured for applying elastic force to the movable portion, so as to maintain the movable portion in the first position
Implementation Method 2
the movable portion is configured to move from the first position to the second position against the elastic force when internal pressure of the battery cell reaches a threshold, so as to release the internal pressure
Data Source
AI summary
A battery cell includes: a shell, including a first wall; an electrode assembly, disposed inside the shell; and a terminal assembly, including an electrode terminal and an elastic member. The electrode terminal includes a fixed portion for electrical connection with the electrode assembly and a movable portion for electrical connection with a current collecting component. The fixed portion is fixedly disposed on the first wall. The movable portion is movably disposed on the first wall, and has a first position in contact with the fixed portion and a second position separated from the fixed portion. The elastic member is used for applying elastic force to the movable portion to maintain the movable portion in the first position. The movable portion is configured to move from the first position to the second position against the elastic force when internal pressure of the battery cell reaches a threshold.