Battery Pressure Sensor Detecting Swelling via Membrane Deformation
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Solution Overview
Problem
Conventional battery control technologies, such as charging blocking methods based on temperature measurements, often result in repeated charging and blocking, increasing charging time and failing to effectively prevent battery ignition or explosion due to swelling, especially in lithium-ion batteries used in portable terminals.
Innovation Solution
A battery pressure detecting sensor is produced using a method that includes a conductive sheet and a membrane sheet with accommodation holes, where the conductive sheet is connected to terminals, and the membrane sheet changes thickness in response to pressure, allowing the sensor to operate in a short mode when excessive pressure is applied, thereby detecting abnormal swelling and preventing secondary accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If charging blocking method based on temperature measurement is used, then battery temperature control is improved, but charging time increases due to repeated charging and blocking
Solution Approach 1:
The patent changes the detection parameter from temperature to pressure. The pressure detecting sensor measures battery swelling pressure directly, allowing for more accurate identification of abnormal states versus normal charging temperature increases, thereby reducing false blocking and minimizing charging time loss.
Solution Approach 2:
The patent replaces the thermal detection system with a mechanical pressure detection system. By using a pressure sensor that detects battery swelling through mechanical deformation, the system achieves more reliable battery safety monitoring without the false positives that occur with temperature-based blocking methods.
2Reliability
If charging blocking method is applied, then battery safety is improved, but charging efficiency deteriorates due to repeated charging and blocking
Solution Approach 1:
The patent changes the safety detection parameter from temperature to pressure. This allows the system to distinguish between normal charging conditions (which may cause temperature rise) and actual dangerous swelling conditions (which cause pressure increase), thereby maintaining battery safety while avoiding unnecessary charging interruptions that reduce charging efficiency.
Solution Approach 2:
The patent implements a feedback mechanism using pressure detection. The pressure sensor continuously monitors battery swelling and provides real-time feedback to the control system, enabling dynamic adjustment of charging operations based on actual battery condition rather than relying on temperature thresholds that cause false positives and reduced charging efficiency.
3Object-affected harmful factors
If temperature-based charging blocking is used, then ignition prevention is improved, but false alarm rate increases causing normal batteries to be treated as abnormal
Solution Approach 1:
The patent changes the detection parameter from temperature to pressure to improve measurement precision. Battery swelling that could lead to ignition creates internal pressure changes that are detected by the pressure sensor, providing more accurate differentiation between normal and abnormal battery states compared to temperature-based methods that suffer from false alarms.
Solution Approach 2:
The patent replaces the temperature-based detection system with a pressure-based mechanical detection system. This substitution improves measurement precision by directly detecting the physical swelling of the battery that precedes ignition, rather than detecting temperature changes that occur during both normal charging and abnormal conditions, thereby reducing false alarm rate.
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 sensor effectively detects excessive expansion pressure in lithium-ion batteries, preventing failures like ignition or explosion, and enabling stable operation of portable terminals by minimizing charging time and reducing false alarms.
Implementation Method 1
a membrane sheet having a conductive material whose thickness is changed according to a pressure
Data Source
AI summary
Disclosed is a method for producing a sensor and a battery pressure detecting sensor produced thereby, which operate in a short mode when a pressure of a standard level or more is applied, thereby preventing the breakage and ignition of a battery due to swelling. The disclosed battery pressure detecting sensor disposes a membrane sheet formed with a first accommodation hole under a conductive sheet, has a part of the conductive sheet connected to a first terminal through a first accommodation hole, and has the membrane sheet connected to a second terminal.