Battery Choke Integration for Rapid Thermal Response
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Solution Overview
Problem
Existing cell protection systems, which use chokes connected via double-sided tape and adapter pieces, suffer from delayed triggering of current reduction during abnormal heating, often failing to prevent overcharge or overheating.
Innovation Solution
A cell design where the choke is electrically connected to the electrode tab with a shortened connection path, utilizing a thermistor or thermal switch, and materials with high thermal conductivity, ensuring timely heat conduction and triggering of the choke to reduce current and prevent overcharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the choke is connected to the electrode tab through double-sided tape and adapter pieces, then the assembly is easier to manufacture, but the connection path length increases causing delayed heat conduction and late triggering of the choke
Solution Approach 1:
The patent merges the connection terminal and adapter piece into a single integrated component. The connection terminal directly contacts the electrode tab and provides the electrical connection to the choke, eliminating the need for separate adapter pieces and double-sided tape. This integration shortens the heat conduction path while maintaining ease of assembly through a simplified single-component attachment process.
Solution Approach 2:
The patent extracts and removes the non-essential double-sided tape and adapter pieces from the connection path. By eliminating these intermediate components, the heat conduction path is directly shortened from the electrode tab to the choke, reducing thermal resistance and triggering delay while preserving the essential electrical connection function.
2Speed
If the connection path length is reduced to improve heat conduction speed, then the triggering response improves, but the assembly complexity increases
Solution Approach 1:
The connection terminal is designed as an integrated component that combines both electrical connection and structural support functions. This merging eliminates the need for separate adapter pieces and reduces the number of assembly steps, thereby shortening the heat conduction path without increasing overall assembly complexity.
Solution Approach 2:
The connection terminal serves multiple functions simultaneously: it provides electrical connection between the electrode tab and choke, acts as a structural mounting point, and facilitates heat conduction. This multi-functionality reduces the number of components needed and simplifies the overall connection structure while maintaining fast heat conduction.
3Reliability
If the choke triggering temperature is set lower to provide earlier protection, then cell safety improves, but the operating temperature range is reduced
Solution Approach 1:
The choke is designed to trigger at a predetermined lower temperature threshold before the cell reaches dangerous overcharge states. This preliminary action ensures that protective measures are activated in advance, preventing thermal runaway and ensuring cell safety by interrupting current flow before critical temperature levels are reached.
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 enables timely triggering of the choke, effectively preventing the cell from reaching an overcharge state and ensuring timely protection against overheating.
Implementation Method 1
the length of the connection path of the choke coupled to the first electrode tab affects the heat conduction speed of the body of the cell to the choke
Implementation Method 2
the choke includes a thermistor that is coupled to a protection circuit to reduce a current passing through the protection circuit when the choke is triggered
Data Source
AI summary
The present invention discloses a cell and a battery, wherein the cell comprises a body including a first electrode tab; and a choke that triggers after the temperature reaches a certain value to reduce the current passing through it; the choke is electrically connected to the first electrode tab, and a product of the length of connection path from the choke to the first electrode tab and a cooling coefficient of the connection path is smaller than a difference between a first temperature of the first electrode tab and a second temperature of the choke, wherein the second temperature of the choke is a temperature when the choke is triggered. In the above-mentioned cell, if the trigger action of the choke is timely, the body of the cell can be prevented from reaching the overcharge state, and the choke in the above-mentioned cell can further effectively protect the cell.