Battery Pack Sealing Portion Thickness Variation for Heat Sensing
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Solution Overview
Problem
Existing battery packs face challenges in accurately sensing heat generated by battery cells due to the thickness difference between the sealing portion and the electrode lead, which can lead to inefficiencies in temperature control and safety.
Innovation Solution
A battery pack design featuring a connecting tab with a bent portion that connects the temperature control portion and the protecting circuit module, minimizing the gap between the temperature control portion and the sealing portion, allowing for improved heat sensing and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sealing portion has a uniform thickness, then the manufacturing process is simple, but the temperature control portion cannot accurately sense heat due to the thickness difference with the electrode lead
Solution Approach 1:
The sealing portion is designed with different thicknesses in different regions: a first thickness in the first region corresponding to the electrode lead and a second thickness in the second region adjacent to the electrode lead. This local quality variation allows the temperature control portion to accurately sense heat from the battery cell while maintaining structural integrity, resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the temperature control portion is placed close to the battery cell for accurate heat sensing, then heat sensing accuracy improves, but the risk of thermal runaway spreading increases
Solution Approach 1:
The sealing portion acts as an intermediary between the battery cell and the temperature control portion. By positioning the temperature control portion on the sealing portion rather than directly on the battery cell, the system achieves accurate heat sensing while the sealing portion serves as a physical barrier that prevents direct contact and potential thermal runaway propagation, thus resolving the contradiction between measurement precision and safety.
3Manufacturing precision
If the connecting tab is straight without bent portions, then the manufacturing process is simpler, but the temperature control portion cannot be positioned correctly due to thickness differences
Solution Approach 1:
The connecting tab includes a bent portion that allows it to accommodate the thickness difference between the first and second regions of the sealing portion. This curvature enables the temperature control portion to be positioned accurately on the second region while the connecting tab maintains electrical connection, resolving the contradiction between manufacturing precision and ease of manufacture by using a simple geometric modification rather than complex positioning mechanisms.
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 design enhances the heat sensing functionality of the temperature control portion, thereby improving the safety and performance of the battery pack by accurately monitoring heat generated in the battery cells.
Implementation Method 1
a first surface of the temperature control portion contacts the second region of the sealing portion
Data Source
AI summary
A battery pack includes a pouch, an electrode assembly in the pouch, an electrode lead, the electrode lead being electrically coupled to the electrode assembly and extending from a sealing portion of the pouch, the sealing portion having a first thickness in a first region corresponding to the electrode lead and a second thickness in a second region adjacent to the electrode lead, the second thickness being less than the first thickness, and a protecting circuit module, the protecting circuit module including a substrate, a temperature control portion, and a connecting tab, the substrate having a first surface mounted on the first region, the first surface of the substrate being spaced apart from the second region, the connecting tab coupling the temperature control portion to the substrate, the connecting tab being configured such that a first surface of the temperature control portion contacts the second region of the sealing portion.