Secondary Battery Non-Coated Passage for Internal Temperature Sensing
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Solution Overview
Problem
Pouch-type secondary batteries are vulnerable to overheating, leading to potential explosions due to delayed detection of internal temperature increases caused by short circuits, and suffer from efficiency losses due to gas generation between electrode plates.
Innovation Solution
A secondary battery design featuring a non-coated passage for gas discharge and an internal temperature sensor within the battery case, allowing for precise temperature measurement and control, reducing the risk of thermal runaway and maintaining energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional protection device measuring surface temperature is used, then the device structure is simple, but the temperature detection is delayed and cannot prevent thermal runaway
Solution Approach 1:
The temperature sensor is nested within the electrode plate structure itself, with the sensing element positioned in the non-coated passage. This integration allows internal temperature monitoring without adding external components, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The non-coated passage serves as an intermediary structure that enables the temperature sensor to access internal temperature conditions. The passage provides a pathway for the sensor lead while allowing the sensing element to measure temperature at the electrode plate interface, achieving accurate detection without complex external instrumentation.
2Reliability
If gas is generated inside the pouch-type battery, then the battery structure remains simple, but the outer case swells and may explode
Solution Approach 1:
The harmful gas is extracted from the battery interior through the non-coated passage, which serves as a discharge pathway. By providing this extraction route, the gas is removed before it can cause swelling or explosion, improving safety without requiring complex pressure relief mechanisms or additional components.
Solution Approach 2:
The non-coated passage, which could be seen as a structural deficiency, is converted into a beneficial feature by serving as a gas discharge pathway. The same structural element that allows temperature sensing also enables safe gas venting, transforming a potential weakness into a safety mechanism.
3Measurement precision
If a temperature sensor is added inside the battery, then temperature monitoring accuracy improves, but the manufacturing process becomes more complex
Solution Approach 1:
The electrode plate is segmented to create the non-coated passage, which simultaneously serves as a structural feature and a sensor integration pathway. This segmentation approach allows the temperature sensor to be incorporated during the electrode plate manufacturing process rather than requiring post-assembly installation, maintaining manufacturing simplicity while enabling internal temperature measurement.
4Object-affected harmful factors
If the battery uses a pouch-type case, then fabrication cost and weight are reduced, but the battery becomes vulnerable to overheating
Solution Approach 1:
The gas generation, which represents energy loss and safety hazard, is converted into a beneficial venting mechanism. The non-coated passage allows gas to escape in a controlled manner, preventing the more harmful effects of gas accumulation such as swelling and explosion, while the lightweight pouch structure is preserved.
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 quick and accurate temperature monitoring, preventing safety hazards from thermal runaway and reducing energy losses by allowing gas to escape, thus enhancing safety and efficiency.
Implementation Method 1
a temperature sensor including a temperature sensing unit located within the non-coated passage and a sensor lead extending from the temperature sensing unit
Implementation Method 2
at least one non-coated passage formed across the electrode plate... allowing gas to escape
Data Source
AI summary
A secondary battery according to the present disclosure includes a cell assembly including a unit cell having at least one non-coated passage formed across an electrode plate, a temperature sensor including a temperature sensing unit located within the non-coated passage and a sensor lead extending from the temperature sensing unit, and a battery case to receive the cell assembly and which is sealed in a state that the sensor lead is drawn outside.According to the present disclosure, a temperature change of the secondary battery may be measured quickly and correctly, and thus, the secondary battery may be controlled more minutely in response to a temperature change, and gas generated in the battery case during charging and discharging of the secondary battery may be easily discharged to a surrounding area of the cell assembly, thereby preventing a battery efficiency reduction phenomenon.