Battery Heating Sheet with 40-90% Coverage Area
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Solution Overview
Problem
Battery efficiency and lifespan are compromised in low temperatures, particularly in winter, due to reduced ion mobility and hardening of electrolytes in batteries used in photovoltaic power generators and electric vehicles, necessitating effective heating methods.
Innovation Solution
A heating sheet for battery modules with a surface heating element, insulating layer, and insulating adhesive layer, where the heating portion covers 40% to 90% of the battery cell area, using materials like carbon nanotubes and graphene to generate heat, directly heating the battery cell and increasing the electrolyte temperature by 20°C or more within 200 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating sheet with a heating portion covering 40% to 90% of the battery cell area is used, then the battery cell is uniformly and effectively heated, but the heating area is optimized to minimize energy consumption and prevent overheating
Solution Approach 1:
The heating sheet applies local quality by concentrating the heating function in a specific portion (40%-90% of battery cell area) rather than heating the entire surface. This localized heating approach ensures effective temperature increase in critical areas while minimizing energy consumption and preventing overheating in non-critical regions.
2Area of stationary object
If the heating portion area is increased to heat more of the battery cell, then heating coverage is improved, but the risk of overheating and energy waste increases
Solution Approach 1:
The heating sheet implements partial action by activating only the necessary portion (40%-90% of battery cell area) for effective heating. This partial coverage approach provides sufficient heating coverage to maintain battery performance while deliberately avoiding excessive heating that would cause overheating risks and energy waste.
3Device complexity
If traditional heating methods like thermoelectric elements or PTC heaters are used to heat air, then the heating mechanism is simple, but the heating efficiency is low compared to direct battery heating
Solution Approach 1:
The invention replaces traditional air-based heating mechanisms (thermoelectric elements or PTC heaters) with a direct contact heating sheet that transfers heat directly to the battery cell surface. This substitution eliminates the inefficient air heating intermediate step, significantly improving heating efficiency while maintaining relatively simple device structure through the use of a heating element with insulating layers.
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 heating sheet effectively raises the battery cell temperature, enhancing output and extending lifespan by maintaining efficient operation and charging/discharging efficiency in winter conditions.
Implementation Method 1
The heating layer may include at least one selected from the group consisting of carbon nanotubes, carbon black, graphene, graphite, and combinations thereof
Data Source
AI summary
Provided is a heating sheet for a battery module, including: a surface heating element; an insulating layer on one surface of the surface heating element; and an insulating adhesive layer on the other surface of the surface heating element, in which the area of the heating portion of the surface heating element is 40% to 90% of the entire area of the battery cell to which the surface heating element is attached. Also provided is a battery module including the heating sheet for a battery module and the battery cell, in which the area of the heated portion of the battery cell is 40% to 90% of the entire area of the battery cell.