Honda Motor Corporation's 2018 Clarity plug-in hybrid vehicle (PHEV) has a battery pack equipped with a liquid cooling system. This is the first time the company has adopted a liquid cooling system because Honda's existing hybrid vehicles (HEVs) ) And plug-in hybrid vehicle battery packs are all air-cooled cooling system.
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The Clarity plug-in hybrid's IPU (intelligent power unit) consists of a lithium-ion (Li-ion) battery pack, a DC-DC converter, and an ECU (electrical control unit) to control the body Batteries under the floor. Honda increased the battery capacity to 17.0 kilowatt-hours (kWh) to increase the range of electric vehicles, while the Honda Accord plug-in hybrid has a battery capacity of 6.7 kilowatt-hours.
In addition, Honda increased the battery's energy density (Wh / L) and energy output density by 110% and 40%, respectively. Therefore, the heat of the battery pack also increases. If an air-cooled cooling system is used to solve the heat problem, an air passage must be provided between the batteries, which will increase the volume of the battery pack, and it will be difficult to ensure that there is enough internal space to comfortably accommodate 5 adults. Therefore, Honda battery packs began to use liquid-cooled heat dissipation systems. The heat dissipation effect is about 250% higher than that of air-cooled heat dissipation systems, which can effectively cool the battery pack.
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Specifically, the Clarity plug-in hybrid has a special radiator installed inside the front grille, and the electronic water pump supplies coolant to the water tank located below the battery pack. This coolant is then used to cool DC-DC converters, chargers, etc. When the battery pack does not need to be cooled (for example, when the battery is charged using an external power source), the three-way valve sends the coolant to the bypass. With this mechanism, the entire IPU, including the battery pack, can effectively dissipate heat.