Pouch Battery Temperature Sensor Integrated Into Electrode Lead
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Solution Overview
Problem
Pouch-type secondary batteries face challenges in accurately measuring internal temperature due to temperature differences between the inside and outside of the pouch, limiting precise temperature measurement.
Innovation Solution
A temperature sensor is inserted into an insertion hole of the electrode lead, featuring a temperature measurement part inside the pouch, a connector outside the pouch, and a reinforcement layer to enhance adhesion, with an anti-oxidation protection layer and sealing material to stabilize the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is installed inside the pouch to measure internal temperature, then temperature measurement accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The temperature sensor is integrated with the electrode lead structure, merging two components into one unified assembly. The sensor is positioned within the electrode lead body, eliminating the need for separate installation steps and reducing overall device complexity while maintaining internal temperature measurement capability
Solution Approach 2:
The electrode lead serves dual functions: electrical connection and temperature sensing. By incorporating the temperature sensor within the electrode lead structure, the same component performs both electrical and thermal measurement functions, simplifying the overall battery structure
2Reliability
If the temperature sensor thickness is increased to ensure stable fixation, then reliability is improved, but the battery thickness increases
Solution Approach 1:
The temperature sensor is nested within the electrode lead structure, with the sensor positioned inside the lead body. This nested arrangement allows the sensor to be securely fixed without adding external thickness, as the sensor occupies space within the existing lead structure rather than adding to it
Solution Approach 2:
The electrode lead utilizes a thin-film structure that accommodates the temperature sensor while maintaining overall thinness. The lead film is designed with sufficient thickness to embed the sensor securely while keeping the total battery thickness minimal
3Measurement precision
If the electrode lead is cut to create an insertion hole, then temperature measurement capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insertion hole is pre-formed in the electrode lead during the lead manufacturing process, before assembly with the battery components. This preliminary action allows for precise hole positioning and dimensions to be established during manufacturing, ensuring proper sensor fit without requiring high-precision cutting operations during final assembly
Solution Approach 2:
The electrode lead is divided into functional segments: a first portion with the insertion hole for sensor placement, and a second portion for electrical connection. This segmentation allows the insertion hole to be created in a controlled manner during manufacturing, with the hole positioned in a dedicated section designed for this purpose
4Reliability
If sealing material is added between the sensor and insertion hole, then reliability is improved, but device complexity increases
Solution Approach 1:
The sealing material is integrated into the electrode lead structure as part of the insertion hole formation process. The sealing function is merged with the structural components rather than being a separate added element, maintaining reliability while avoiding increased device complexity
Solution Approach 2:
The electrode lead utilizes composite material construction that incorporates sealing properties directly into the lead structure. The material composition provides both structural integrity and sealing capability, eliminating the need for separate sealing components
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 accurately measures internal pouch temperature, minimizing thickness increase and preventing oxidation, ensuring stable fixation and sealing, thereby enhancing temperature measurement accuracy.
Implementation Method 1
The temperature measurement part may be coated with an anti-oxidation protection layer
Implementation Method 2
the connection part may be provided with a reinforcement layer that increases in adhesion to the lead film
Data Source
AI summary
A secondary battery includes: an electrode assembly; a pouch configured to accommodate the electrode assembly; an electrode lead which is coupled to an electrode tab provided on the electrode assembly, of which a front end is withdrawn out of the pouch, and in which an insertion hole extending from an inside to an outside of the pouch is defined; and a temperature sensor inserted into the insertion hole. The temperature sensor comprises a temperature measurement part disposed inside the pouch to measure a temperature inside the pouch and a connector disposed outside the pouch. Additionally, a temperature sensor and a method for manufacturing the secondary battery are also provided.