Cooling liquid composition for fuel cell

Inactive Publication Date: 2006-07-06
SHISHIAI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026] The aliphatic alcohol having unsaturated bonds in the molecules contained in the coolant composition of the present invention prevents generation of ionic substances as a result of oxidation of the base component of the coolant otherwise and is capable of maintaining the electrical conductivity of the coolant low for a long period of time. In addition, as the aliphatic alcohol in the coolant composition of the present invention is not easily removed by an ion exchanger in cooling systems, the duration of effectiveness of the ion exchanger is extended.

Problems solved by technology

If the electrical conductivity of the coolant is “high”, the electricity generated in the fuel cells partially flows into the coolant, resulting in loss of electrical power generated in the fuel cell unit.
When the atmospheric temperature falls below the freezing point, pure water coolant would freeze, potentially leading to physically damaging the cooling plates.
The battery performance of the fuel cell system would then deteriorate.
However, the capacity of the ion exchanger deteriorates as time goes by because the ion exchanger is “consumed” for removal of the ionic substances.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The coolant composition of the present invention is described hereunder using embodiments of the present invention. Table 1 shows the respective components of Embodiments 1 to 3 of the present invention and Comparisons 1 to 3. Embodiment 1 consisted of ethylene glycol, 3-butene-1-ol (aliphatic unsaturated alcohol), and deionized water. Embodiment 2 consisted of ethylene glycol, 4-pentene-1-ol (aliphatic unsaturated alcohol), and deionized water. Embodiment 3 consisted of ethylene glycol, 2,5-dimethyl-3-hexyne-2,5-diol (aliphatic unsaturated alcohol), and deionized water. Comparison 1 consisted of ethylene glycol and deionized water. Comparison 2 consisted of ethylene glycol, 1-butanol (aliphatic saturated alcohol), and ion exchanged water. Comparison 3 consisted of ethylene glycol, 1-pentanol (aliphatic saturated alcohol), and dedionized water.

TABLE 1(parts by weight)Com-Com-Com-Embod-Embod-Embod-par-par-par-Itemiment 1iment 2iment 3ison 1ison 2ison 3ethylene glycol50505050...

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PUM

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Abstract

A coolant composition for a fuel cell unit, which contains at least one aliphatic alcohol having unsaturated bonds in the molecules having 2 to 20 carbon atoms each. The coolant composition maintains the electrical conductivity of the coolant at 10 μS / cm or below as well as the fluctuation of the electrical conductivity within the range of 0 to 10 μS / cm.

Description

RELATED APPLICATION [0001] This application is a continuation of PCT Application No. PCT / JP2003 / 016646 filed Dec. 24, 2003 which claims priority to PCT Application No. PCT / JP2003 / 008879 filed Jul. 11, 2003, each of which are hereby incorporated by references herein.TECHNICAL FIELD [0002] The present invention relates to a coolant composition for fuel cells, and specifically to such a coolant composition for automobiles. In particular, the present invention relates to a coolant composition that provides an excellent antifreeze property and is capable of maintaining the electrical conductivity of the coolant adequately low for a long period of time. BACKGROUND TECHNOLOGY [0003] Generally a fuel cell unit which generates electrical power is provided as a stack of a plurality of fuel cells. During power generation, heat is generated from the fuel cells. To cool the fuel cell unit, a cooling plate is inserted between every few fuel cells. [0004] A fluid path for coolant is provided in ea...

Claims

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Application Information

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IPC IPC(8): H01M8/04C09K5/00C09K5/10
CPCC09K5/10H01M8/04029Y02E60/50
InventorEGAWA, HIROSHIKAGA, NOBUYUKI
OwnerSHISHIAI KK