Cell Protection Circuit With Staged Thermal Discharge Paths
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Solution Overview
Problem
The continuous rise in temperature during charging due to increasing voltage and energy density in cells leads to thermal instability, compromising reliability and safety, with existing solutions like material replacement impairing other performance indicators.
Innovation Solution
A cell protection circuit with parallel branch circuits that discharge the cell when temperature thresholds are reached, converting electrical energy into mechanical, acoustic, or optical energy to manage thermal stability without affecting other performance indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If material replacement or safety additives are used to improve thermal stability, then thermal stability is improved, but energy density and fast charge performance deteriorate
Solution Approach 1:
The patent introduces a protection circuit as an intermediary component between the cell materials and the thermal runaway risk. This circuit monitors temperature and actively manages charge discharge to prevent thermal instability, rather than relying on material modifications that would compromise energy density. The protection circuit acts as a mediator that enables high energy density materials to operate safely without requiring thermal stability improvements through material replacement.
Solution Approach 2:
The patent replaces the chemical/material-based approach (modifying electrode materials or electrolytes to improve thermal stability) with an electrical/electronic control approach (protection circuit that monitors and controls charge discharge). This substitution allows the cell to maintain high energy density materials while achieving thermal stability through active electrical management rather than material composition changes.
2Productivity
If voltage and energy density are increased to improve charging capacity, then charging capacity is improved, but temperature rises and thermal stability deteriorates
Solution Approach 1:
The protection circuit implements a feedback mechanism by continuously monitoring the cell temperature and adjusting the charge discharge process accordingly. When the temperature approaches unsafe levels during high-capacity charging, the circuit automatically reduces charge current or activates discharge paths to maintain temperature within safe boundaries. This closed-loop feedback enables the system to achieve high charging capacity while actively preventing temperature-related thermal stability issues.
Solution Approach 2:
The patent introduces dynamic control of the charge discharge process through the protection circuit. Rather than using static material properties to manage temperature, the system dynamically adjusts electrical parameters (current, voltage, discharge rate) based on real-time temperature conditions. This dynamic management allows the cell to operate at high voltage and energy density while maintaining thermal stability through adaptive control during the charging process.
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
Improves thermal stability and safety of cells by consuming charge to prevent overheating, maintaining reliability without impairing other performance indicators.
Implementation Method 1
converting electrical energy into mechanical, acoustic, or optical energy to manage thermal stability
Data Source
AI summary
A protection circuit in this application is electrically connected between a first tab and a second tab of a cell. The protection circuit includes a first branch circuit or includes a first branch circuit and a second branch circuit that are connected in parallel. When a temperature of the cell is greater than or equal to a first temperature threshold, the cell is discharged through the first branch circuit. When the temperature of the cell is greater than or equal to a second temperature threshold, the cell is discharged through both the first branch circuit and the second branch circuit. The second temperature threshold is greater than the first temperature threshold.