Cooling system for on-vehicle secondary battery

Abstract

If the battery temperature (TB) of the main battery (10) is equal to or higher than the first temperature (T0) after a hybrid power vehicle is started, the cooling system performs first constant control for driving the cooling fan (40) with a first command value a predetermined duration and also performs the problem detection processing based on an actual rotation rate of the cooling fan (40) during the constant control. In addition, the battery temperature (TB) of the main battery (10) is equal to or higher than the first temperature (T0) during inhibition of the first constant control under a predetermined condition and a noise level within a vehicle interior is equal to or higher than a predetermined value (Lo), the cooling system performs second constant control for driving the cooling fan (40) with a second command value (D3) and performs the problem detection processing based on an actual rotation rate of the cooling fan (40) during the second constant control. And in this way, discomfort of passengers and over-temperature of a secondary battery can be suppressed, and a chance for detection of the cooling fan is fully ensured.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2015-080686 filed on April 10, 2015, and the contents thereof are incorporated herein by reference. technical field [0002] The present invention relates to a cooling system for cooling a secondary battery for driving a hybrid vehicle. Background technique [0003] A hybrid vehicle is equipped with a secondary battery (battery) that stores electrical energy for driving the vehicle. The temperature of the secondary battery rises as charge and discharge are performed due to its own internal resistance. Therefore, in the prior art, some solutions have been proposed, that is, a cooling fan is provided around the secondary battery, and the secondary battery is forcedly air-cooled by the cooling fan. [0004] For example, Japanese Patent Application Laid-Open No. 2010-158964 discloses a cooling device for electrical components of a vehicle, which includes a cooling fan near a secondary battery. In ...

AI Technical Summary

Problems solved by technology

However, when the cooling fan is driven at a fixed duty ratio, it is of course difficult to perform appropriate cooling according to the temperature of the secondary battery. For example, if the rotation speed is insufficient to sufficiently cool the secondary battery, there is a possibility that the secondary battery may overheat.

[0008] In addition, in order to cope with the high temperature of the secondary battery, constant control of the cooling fan in a high output state (such as the maximum duty ratio) has been studied, but this will cause excessive cooling (overcooling) of the secondary battery

In addition, there was a problem that the noise of the cooling fan became louder, causing discomfort to passengers.

Images