Thermally-conductive silicone gel is widely used as a high-performance composite material in new energy vehicles due to its excellent thermal conductivity and single component thermally conductive sealant with excellent thermal conductivity.Thermally Conductive Silica can be created through condensation reaction with moisture in the atmosphere, producing low molecular releases, crosslinking and curing that lead to high-performance elastomers with excellent adhesion properties. Thermal Conductive Silica boasts both high and low temperature resistance.
Thermally Conductive Silica boasts electrical insulation and age resistance properties. Furthermore, its chemical stability allows for adhesion with most metals and nonmetallics; making thermal conductive silica an indispensable material in many fields. Thermally Conductive Silica plays an integral part in improving range and safety for new energy vehicles. New energy cars typically feature battery systems consisting of different kinds of cells such as lithium manganese dioxide, lithium iron phosphate or ternary batteries as well as fuel cells to power their operation. As more batteries are installed, their distance becomes closer together. Unfortunately, battery cells generate heat during discharge or charging that could lead to dangerous consequences, including fires or short circuits in other cells if their ability to dissipate heat effectively is diminished. Thermally conductive silica, due to being flexible, ductile, and lightweight material can quickly fill in gaps between cells to transfer heat quickly from their interiors to external air cooling zones or the outside environment for rapid heat dispersion ensuring systemic safety. Thermally conductive silica acts as a heat transfer bridge in various cooling methods, further increasing battery benefits while prolonging their longevity. Insulation properties of separators play an integral part in providing efficient heat transfer between cells and heat dissipation zones, and their insulation properties prevent high voltages caused by excess current in battery cells from increasing with each charge cycle, maintaining system operability without interruption, or short circuiting occurring.
The theory behind battery heat production can be simplified into five key points.
Thermal Management Performance of Vehicle Batteries with Silica Gel Plate (CSGP) coupled to Air Cooling
The previous section details the fundamental working principles of BTMs and batteries used for new energy vehicles. Temperature increases may occur during charging or discharging processes or exposure to sunlight. Battery lifespan and safety can be compromised if its temperature rises above the recommended operating temperature, leading to potential thermal runaway and thermal runaway risks that pose safety threats. Heating generated during charging and discharging can be considerable, which is why CSGP's excellent thermal conductivity, heat dissipation, and performance features are employed to remove it via air-cooling modules. Here we test its use as part of automotive battery thermal management using air cooling.
As part of an experiment, it is also crucial to pay close attention to the thermal resistance between the CSGP and battery body. Thermal resistance plays an important role in heat conduction which ultimately affects temperature distribution within battery modules and heat dissipation. Thermal resistance between CSGP and the battery body may skew experimental results, even though its thermal conductivity is excellent. In this research study, however, the focus is primarily on exploring CSGP as a heat dissipation solution within battery modules. This experiment did not fully explore any thermal resistance between batteries and CSGP, with its main objective being to evaluate CSGP's potential in heat dissipation, thus improving temperature control of battery modules discharged at high rates.
Figure shows the platform assembly used for experimental testing. 7. Separate battery modules equipped with their own cooling systems have been placed inside an incubator at 40 degC for all experiments conducted within it. Common power battery testing environments range between 0-40 degC. If the ambient temperature falls between 0 degC and 40 degC, battery performance may be affected and discharge capacity reduced accordingly. To ensure accuracy, battery modules will be incubated for two hours to achieve temperature stabilization before being charged and discharged using a battery testing system with T-type thermocouples attached directly to their surfaces and an Agilent temperature instrument. This process measures the temperature change in each module using an Agilent to track battery temperatures every two seconds and fans to force convection cooling of composite thermally conductive silicon gel plate-forced-cooling (CSGPFC) modules.
Direct-current power supplies supply energy for fans. To ensure accuracy, it is crucial that each battery be tested for internal resistance as well as its charge-discharge curve before discharging and charging it prior to any experiment. A battery module uses cells with closely matched resistances that must maintain equal states of charge in all batteries.
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