Pouch Battery Current Interruption for Overcharge Explosion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch batteries in electric vehicles are prone to overcharging, leading to potential explosions due to abnormal phenomena during the charging process.
Innovation Solution
A battery system with a current interrupt device on each cell that interrupts the internal current when abnormal conditions, such as overcharging, are detected, using a mechanical structure that responds to air pressure changes to disconnect the electrical connection between electrode terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery modules are connected in series to increase voltage, then output power is improved, but internal resistance increases and uniformity of charge-discharge characteristics deteriorates
Solution Approach 1:
The battery system is divided into multiple battery modules that can be independently managed and controlled. Each module can be monitored and regulated separately through individual temperature sensors and control circuits, allowing the system to maintain uniform charge-discharge characteristics across all modules even when connected in series to achieve high voltage and power output.
2Use of energy by moving object
If battery capacity is increased to extend driving range, then energy storage is improved, but heat generation increases and temperature control difficulty worsens
Solution Approach 1:
The battery system divides large capacity storage into multiple modular units, each equipped with independent temperature monitoring. This segmentation allows for distributed thermal management where each module can be controlled independently, preventing heat accumulation and maintaining safe operating temperatures even when total energy storage is large.
Solution Approach 2:
The control circuit acts as an intermediary between the battery modules and the thermal management system. It receives temperature information from sensors and automatically adjusts charging/discharging parameters or activates cooling mechanisms to manage heat generation in high-capacity battery systems.
3Weight of moving object
If battery system volume is reduced to decrease vehicle weight, then weight is improved, but safety and reliability may deteriorate
Solution Approach 1:
The battery system employs a nested structural design where battery modules are compactly arranged within the vehicle chassis. Temperature sensors are integrated within or adjacent to each module, and the control system is embedded within the battery structure itself. This nesting achieves space efficiency and weight reduction while maintaining comprehensive safety monitoring and control functions.
4Measurement precision
If monitoring accuracy is increased to improve safety, then detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The monitoring system is segmented into simple, standardized temperature sensors placed at key locations within each battery module. Rather than using one complex high-precision sensor, multiple simple sensors provide distributed temperature monitoring. The control circuit processes this data with straightforward algorithms to achieve accurate thermal management without requiring complex detection equipment.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A battery system and an electric vehicle are disclosed. The battery system includes at least one series circuit, a pouch battery and at least one first cell connected to the pouch battery in series being disposed in the series circuit, and a current interrupt device being disposed on the first cell; and the current interrupt device of the first cell being configured to interrupt an internal current of the first cell when at least one of the pouch battery and the first cell is abnormal.