Battery Safety Valve Sensing Circuit for Vent Opening Detection
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Solution Overview
Problem
Current battery management modules cannot detect whether a battery safety valve is opened, which limits their ability to comprehensively assess the operating state of batteries, particularly in high-voltage battery packs used in electric vehicles and energy storage systems, leading to potential safety issues like explosions and overheating.
Innovation Solution
A battery safety valve and temperature detection circuit that includes a temperature sensor, a reference resistor, and a safety valve sensor connected in series, allowing an acquisition chip to detect the opening of the safety valve and measure battery temperature, thereby providing a more comprehensive assessment of the battery's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a battery management module is used to detect battery state, then voltage, temperature, and current information can be measured, but the module cannot detect whether the safety valve is opened
Solution Approach 1:
The patent combines the safety valve detection function with the existing temperature detection circuit by integrating a safety valve sensor (first detection wire and second detection wire) into the series connection of the temperature sensor and reference resistor. The acquisition chip reads both temperature data and safety valve status data through the same circuit, eliminating the need for separate detection systems and reducing overall device complexity.
Solution Approach 2:
The existing battery management module's acquisition chip is made multi-functional by enabling it to read both temperature sensor data and safety valve sensor data through the same voltage acquisition ports. This allows a single device to perform multiple detection functions (temperature monitoring and safety valve status detection) without requiring additional dedicated hardware, thus improving measurement precision without proportionally increasing device complexity.
2Reliability
If the safety valve is opened for pressure relief, then explosion is prevented, but chemical substances inside the battery may catch fire after reaction with oxygen in the air
Solution Approach 1:
The patent implements a feedback mechanism where the safety valve sensor continuously monitors the safety valve status and transmits this information to the acquisition chip. When the safety valve opens, the system immediately detects the change in electrical connection status and can trigger alarm signals or protective measures, providing real-time feedback to prevent harmful effects like fire from occurring.
Solution Approach 2:
The system performs preliminary detection of the safety valve status through the integrated sensor circuit before any harmful effects can occur. By continuously monitoring the electrical connection state of the safety valve sensor, the system can detect valve opening in advance and initiate protective actions (such as alarms or isolation) before chemical substances have time to react with oxygen and cause fire.
3Quantity of substance
If the battery operates at high voltage with many batteries connected in parallel and series, then energy capacity is increased, but safety problems become increasingly prominent
Solution Approach 1:
The patent applies segmentation by providing individual safety valve sensors and temperature sensors for each battery cell within the high-voltage battery pack. Each battery's safety valve status is independently monitored through its own detection wires connected to the acquisition chip, allowing granular safety monitoring of each segment (battery) rather than treating the entire pack as a single unit, thus maintaining reliability as battery quantity increases.
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
Enables the detection of safety valve opening and temperature measurement, enhancing the overall safety monitoring of batteries by preventing explosions and allowing for timely intervention in case of safety issues.
Implementation Method 1
a temperature sensor...arranged on the battery and is configured to measure a temperature of the battery
Implementation Method 2
when the safety valve is opened, a liquid in the battery is in contact with a bottom of the safety valve sensor, so that the safety valve sensor is short-circuited, and a voltage acquired by the acquisition chip changes
Data Source
AI summary
A battery safety valve and temperature detection circuit, includes a battery, a temperature sensor, and a reference resistor that are connected in series to form a loop, and a safety valve sensor arranged outside a battery safety valve. The temperature sensor is arranged on the battery, voltage acquisition wires are connected to a positive electrode and a negative electrode of the battery respectively, a partial voltage acquisition wire is connected to a wire connected between the temperature sensor and a reference resistor, the voltage acquisition wires and the partial voltage acquisition wire are connected to corresponding voltage acquisition ports of an acquisition chip respectively. The safety valve sensor is connected in parallel to the reference resistor; and when the safety valve is open, a liquid in the battery is in contact with a bottom of the safety valve sensor, and the safety valve sensor is short-circuited.