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Cooling system for on-board secondary battery

A secondary battery and cooling system technology, applied in the field of cooling systems, can solve problems such as secondary battery overheating, passenger discomfort, and cooling fan noise increase, and achieve the effect of ensuring that there is no abnormality and suppressing discomfort

Active Publication Date: 2018-10-26
TOYOTA JIDOSHA KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 high-temperature secondary batteries, 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.

Method used

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  • Cooling system for on-board secondary battery
  • Cooling system for on-board secondary battery
  • Cooling system for on-board secondary battery

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Embodiment Construction

[0025]

[0026] Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a system configuration of a hybrid vehicle 90 equipped with an on-vehicle secondary battery cooling system 80 according to the present embodiment will be described. also, figure 1 The dotted line in represents the signal line.

[0027] This hybrid vehicle 90 is a hybrid vehicle that uses two types of power sources (motor generators 16 and 18 and engine 20 ) for driving wheels 26 . Main battery 10 for driving a vehicle is connected to positive and negative input terminals of system main relay 13 via positive bus bar 11 a and negative bus bar 12 a. The main battery 10 is, for example, a rechargeable secondary battery such as a nickel metal hydride battery or a lithium ion battery.

[0028] The positive side output terminal and the negative side output terminal of the system main relay 13 are connected to the step-up transformer 14 via the positive side...

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Abstract

A cooling system for an on-vehicle secondary battery, when the battery temperature (TB) of the main battery 10 reaches a first temperature (T0) or higher after the start of the hybrid vehicle, the cooling fan is driven at a first command value for a predetermined period of time (40) The first fixed control of the fixed control, and the abnormality detection process of detecting whether the cooling fan (40) is abnormal based on the actual rotation speed of the cooling fan (40) during the fixed control, and in addition, when the battery temperature (TB) of the main battery (10) reaches When the first temperature (T0) is above and the first fixed control is prohibited due to a predetermined condition, if the noise level in the vehicle interior reaches a predetermined value (Lo) or above, the cooling fan is driven at a second command value (D3) ( 40) of the second fixed control, and abnormality detection processing is performed based on the actual rotation speed of the cooling fan (40) during the second fixed control. Thereby, it is possible to sufficiently secure a chance to detect whether or not there is an abnormality in the cooling fan while suppressing discomfort to the occupants and overheating of the secondary battery.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18H01M10/625H01M10/613H01M10/48B60L50/16
CPCH01M10/613H01M10/625B60L58/26H01M10/48H01M2220/20H01M10/633H01M10/6563Y02T10/70Y02E60/10
Inventor 泉纯太町田清仁土生雅和落合清惠
Owner TOYOTA JIDOSHA KK
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