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New Energy Vehicle X Polyurethane Thermal Conductive Adhesive | Keeping Power Battery Safety

October 29, 2021

    In September last year, President Xi proposed at the 75th United Nations General Assembly that carbon peaks in 2030 and carbon neutral targets in 2060. At the same time, this year’s government work report also included “carbon peaks and carbon neutrality” for the first time as a key task.

One of the keys to achieving the "dual carbon" goal is the transportation industry

    On the one hand, the transportation industry is the main area of global greenhouse gas emissions.

And as China's car ownership continues to increase, carbon emissions in the automotive industry will become the focus of the "dual carbon" goal.

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    On the other hand, there is still a certain gap between China's car ownership per thousand people and developed countries.

As the economy picks up after the epidemic and urbanization is gradually improved, the development of new energy vehicles will help achieve "dual carbon". After all, it can be seen from the working principle of new energy vehicles that new energy vehicles have a more obvious effect  on reducing carbon emissions than traditional fuel vehicles.

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The development of new energy vehicles is ushering in new opportunities under the background of "dual carbon".

01

Power battery thermal management

    As the power source for the operation of new energy vehicles, the power battery is undoubtedly the core of the core.

Power battery components mainly rely on converting chemical energy into electrical energy to provide a source of power for electric vehicles. at low temperatures, the thickening of the electrolyte causes the movement of the conductive medium to be hindered, and the electrochemical reaction rate and depth of the reaction are reduced, resulting in a decrease in battery capacity. The power battery macroscopically shows the phenomenon of electric vehicles "deficit" in the winter environment. on the other hand, excessively high temperature will cause a series of side reactions inside the battery, which not only affects the battery life, but also poses a safety hazard. it is precisely because of the important influence of temperature on the electrochemical reaction that the power battery is obviously restricted by temperature.

    Vehicle chassis space is limited, and battery modules must be closely arranged. However, on the one hand, closely arranged batteries are prone to heat accumulation, and on the other hand, the temperature of the cells in different positions is often not completely the same. therefore, the use of a reasonable thermal management mode to regulate the battery operating temperature and maintain the battery cell temperature consistency in the battery pack is of great significance to the life and safety of the battery pack. especially under the industry trend of pursuing high endurance and fast charging, an excellent power battery thermal management system determines the life and safety of electric vehicles.

02

Application of Polyurethane Thermal Conductive Structural Adhesive

    The thermal management system can be divided into air cooling, liquid cooling, phase change cooling, heat pipe cooling, etc. according to the cooling medium. At present, the power battery industry occupies the "center" position undoubtedly the liquid cooling mode. In the liquid cooling mode, the thermally conductive adhesive plays an important auxiliary role. In order to test the thermal conductivity of thermally conductive adhesives, a well-known scientific research institution established a heating model of single cells, simulated and analyzed the heating of battery modules under different discharge rates, and studied and compared the balanced heat dissipation effects of thermally conductive adhesives with different thermal conductivity on lithium batteries.

    The research results show that: the higher the thermal conductivity of the thermally conductive adhesive, the more obvious the temperature rise and temperature difference of the battery will be reduced, and the more balanced the battery temperature distribution will be. Because the optimal working temperature band of power battery cells is very narrow, generally between 20-40°C, the heat conduction of the thermal conductive sealant can effectively reduce the temperature of the cells and the temperature difference between the cells, which is useful for maintaining the normal operation of the battery thermal management system. Has a very significant effect.

    Different from the performance selection of thermally conductive adhesives in 5G communication base stations (the thermal conductivity is up to 10 W/mK), the thermally conductive adhesives selected in the power battery industry not only need to meet the requirements of thermal conductivity, but also need to be the cost and even the volatile matter are comprehensively considered, so the thermal conductivity is often maintained in the range of 1.2-2.0 W/mK.

    However, due to the limitations of material technology, thermally conductive adhesives with higher thermal conductivity at this stage tend to have higher density and higher cost. Battery manufacturers are unable to choose high thermal conductivity (>3.0 W/m.K) silicone products under the trend of large demand for thermal conductive sealant and continuous cost reduction. at the same time, due to the continuous reduction of the design conditions of the structural parts of the battery pack, the thermally conductive adhesive needs to have a higher strength (greater than 10 MPa) bonding and fixing function in addition to the thermal conductivity function. Therefore, the polyurethane thermal conductivity with advantages in bonding strength and economic cost Structural adhesives have become a realistic choice for many battery factories and new energy vehicle manufacturers.

03

BAIYUN power battery polyurethane solution

    Follow national policies closely to help achieve the dual-carbon goals. as a leader in the domestic sealant industry, BAIYUN deployed the power battery industry early, and launched PU8262 series polyurethane structural adhesives and PU8592 series polyurethane thermal conductive structural adhesives for power battery structural bonding and thermal conductive structural bonding, which can provide thermal conductivity for power batteries Customized solutions with 0.4-2.0 W/mK and bonding strength of 6-15 MPa.

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    At present, with the continuous advancement of the dual-carbon plan, the new energy vehicle industry has ushered in new outlets. With more and more consumers pouring into the new energy vehicle market, the technological level of new energy vehicles is bound to be innovated, and the sealant that combines bonding, sealing, heat conduction, shock resistance and other functions in new energy vehicles is also proposed new requirements.

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    Dedicating the best products to mankind, BAIYUN always insists on providing every consumer with the industry's top sealing system sealant solutions. as the top supplier of domestic sealing and bonding solutions, BAIYUN will surely empower the industry to develop a new ecology with better products and services, and work with many colleagues to promote the technological progress of the new energy automobile industry and help achieve "carbon peak" The goal of “carbon neutrality” is to build a safe, green, healthy and sustainable future.