Pouch Battery Heating Module Insulation Against Low-Temperature Corrosion
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Solution Overview
Problem
Lithium-ion batteries experience significant polarization at low temperatures, limiting the application of traction battery products, which extends the waiting time and significantly affects the customer experience, and the high-rate discharge performance at low temperatures deteriorates, limiting the application of traction battery products, such as electric vehicles and drones, especially in cold weather.
Innovation Solution
A secondary battery design incorporating a heating module with integrated insulation, comprising an insulation layer, body portion, sealing portion, and extension portion, where the insulation layer covers the body portion and is hermetically connected to a sealing layer, controlling the length and melting point difference between them to prevent corrosion and improve cycling performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating unit is introduced into the lithium-ion battery to enable low-temperature charging and discharging, then the low-temperature performance is improved, but the heating unit suffers from corrosion due to poor insulation
Solution Approach 1:
The patent introduces an insulation layer as an intermediary between the heating unit and the electrolyte. This insulation layer prevents direct contact between the heating unit and corrosive electrolyte, thereby eliminating corrosion while maintaining the heating function for low-temperature operation
Solution Approach 2:
The insulation layer is pre-applied to the heating unit before installation in the battery. This preliminary protective measure prevents corrosion from occurring in the first place, allowing the heating unit to operate reliably in the corrosive electrolyte environment without degradation
2Object-generated harmful factors
If the insulation layer is made thicker to improve insulation performance, then corrosion resistance is improved, but the battery volume increases
Solution Approach 1:
The patent optimizes the thickness parameter of the insulation layer to achieve the minimum required thickness for adequate corrosion protection. By carefully selecting and controlling the thickness parameter, the patent achieves sufficient insulation performance while minimizing the volume increase of the battery
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 integrated insulation reduces corrosion on the heating module, enhancing the cycling performance and safety of lithium-ion batteries, allowing normal charging and discharging at low temperatures, thus improving the endurance and safety of battery-powered devices.
Implementation Method 1
the insulation layer entirely covers an outer surface of the body portion
Implementation Method 2
the insulation layer is hermetically connected to the sealing layer
Implementation Method 3
a heating method that provides an optimal heating effect... is to introduce heating units into the lithium-ion batteries, which is a self-heating technology
Data Source
AI summary
A secondary battery including an electrode assembly accommodated in a packaging bag. One end of an electrode terminal is electrically connected to the electrode assembly, and another end of the electrode terminal extends out of the packaging bag. A heating module includes an insulation layer and a body portion, a sealing portion, and an extension portion sequentially connected, the body portion is disposed in the electrode assembly or between the electrode assembly and the packaging bag, the sealing portion is disposed in the packaging bag, the extension portion is disposed outside the packaging bag, and the insulation layer entirely covers an outer surface of the body portion. A sealing layer is at least partially disposed on a surface of the sealing portion and hermetically connected to the packaging bag. In a thickness direction of the heating module, an overlapping region is present between the insulation layer and the sealing layer.