Patent ID: 12187952

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

In order to further illustrate the technical means and effects to achieve the intended purpose of the present invention, accompanying with the drawings and preferred embodiments, the following describes the specific implementation, structure, feature and function of the present invention in detail.

The specific embodiment adopts the following technical solution: an immersion type heat dissipation cooling liquid for power lithium battery is composed of the following components in weight ratios: 30 parts to 70 parts of hydrofluoroether compound, 30 parts to 50 parts of halogenated hydrocarbon, 1 part to 10 parts of alcohol compound, 0.01 parts to 0.5 parts of antioxidant, 0.01 parts to 0.5 parts of preservative, 0.01 parts to 0.5 parts of nano metal oxide. When preparing the immersion type heat dissipation cooling liquid for the power lithium battery of this embodiment, the component may be weighed by gram or kilogram, as long as the mass unit of each component is the same.

In the above formula, the hydrofluoroether compound, the halogenated hydrocarbon and the alcohol compound are mixed to form a hydrofluoroether azeotrope. In this embodiment, the boiling point of the hydrofluoroether compound is 50° C. to 60° C., the boiling point of the formed hydrofluoroether azeotrope is 40° C. to 60° C., and the formed hydrofluoroether azeotrope has high specific heat, low expansion, low toxicity, high insulation, flame retardancy, inertness, strong material compatibility and the like, and can quickly achieve heat transfer effect, effectively solve the problem of heat generation and heat dissipation of the power lithium battery, improve the battery life, reduce the risk of failure, and enhance the safety of the battery. The antioxidant is a bisphenol compound.

Specifically, the hydrofluoroether compound may be 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (HFE-347), 1,1,2,2-tetrafluoroethyl ethyl ether, 1,1,1,2,3,3-hexafluoro-3-methoxypropane (HFE-356mec), methyl nonafluorobutyl ether (HFE-7100), and the like. The halogenated hydrocarbon may be 1,1-dichloroethane, 1,2-dichloroethylene and the like. The alcohol compound may be methanol, ethanol and the like. The antioxidant may be a bisphenol compound, such as phenol. The preservative may be an imidazole compound, or a benzotriazole, which is used to prevent the corrosion and oxidation of the metal materials in the battery components. The nano metal oxides are non-conductive nano metal oxides, such as at least one of nano titanium dioxide, aluminum oxide, and zinc oxide, which are dispersed in the cooling liquid, to increase the specific heat capacity of the cooling liquid, increase the chance of collision between particles, improve thermal conductivity, enhance liquid turbulence effects, improve heat distribution performance, reduce thermal gradients and eliminate thermal polarization.

The method for preparing the immersion type heat dissipation cooling liquid for the power lithium battery of this specific embodiment includes:1. Adding a certain amount of hydrofluoroether compound into a reactor equipped with a stirring device, keeping the room temperature around 25° C.;2. Turning on the stirring device, adding an appropriate proportion of halogenated hydrocarbon and alcohol compound while stirring, and stirring for about 15 minutes to form a hydrofluoroether azeotrope;3. After the hydrofluoroether azeotrope is prepared in step 2, sequentially adding the antioxidant and the preservative, and stirring for about 15 minutes respectively;4. Adding the nano metal oxide additive to the liquid prepared in step 3, stirring at a high speed of 2000 rpm for 30 minutes to obtain the immersion type heat dissipation cooling liquid for the power lithium battery;5. Loading the prepared immersion type heat dissipation cooling liquid for the power lithium battery prepared in step 4 into a plastic bucket, and storing it in a sealed state.

In addition to meeting the performance requirements of high specific heat, low expansion, low toxicity, high insulation, flame retardancy, and etc., the cooling liquid composition of this embodiment also has the characteristics of inertness, strong material compatibility, and etc, so that the battery cell, the casing, and the components and materials immersed in the cooling liquid could not generate a chemical reaction, which can directly and effectively solve the heat generation problem of the power lithium battery.

Example 1

An immersion type heat dissipation cooling liquid for power lithium battery is composed of the following components in weight ratios: 55 parts of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethane ether (HFE-347); 42 parts of 1,1-dichloroethane; 2 parts of methanol; 0.05 parts of phenol; 0.1 parts of benzotriazole; 0.02 parts of nano titanium dioxide; 0.03 parts of nano alumina.

The method for preparing the immersion type heat dissipation cooling liquid for power lithium battery described above is as follows:1. Adding 55 parts of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (HFE-347) to a reactor equipped with a stirring device, keeping the room temperature around 25° C.2. Turning on the stirring device, adding 42 parts of 1,1-dichloroethane and 2 parts of methanol while stirring, and stirring for about 15 minutes to form a hydrofluoroether azeotrope.3. After the hydrofluoroether azeotrope is prepared in step 2, sequentially adding 0.05 parts of phenol and 0.1 part of benzotriazole, and stirring the mixture for about 15 minutes, respectively.4. Adding 0.02 parts of nano-titanium dioxide and 0.03 parts of nano-alumina into the liquid prepared in step 3, stirring at a high speed of 2,000 rpm for 30 minutes to prepare the immersion type heat dissipation cooling liquid for the power lithium battery.5. Loading the heat dissipation cooling liquid for the power lithium battery prepared in step 4 into a plastic bucket, and storing it in a sealed state.

Example 2

An immersion type heat dissipation cooling liquid for power lithium battery is composed of the following components in weight ratios: 65 parts of 1,1,2,2-tetrafluoroethyl ethyl ether; 32 parts of 1,1-dichloroethane; 2.5 parts of methanol; 0.05 parts of phenol; 0.1 parts of benzotriazole; 0.2 parts of nano zinc oxide; 0.15 parts of nano alumina.

The method for preparing the immersion type heat dissipation cooling liquid for the power lithium battery described above is as follows:1. Adding 65 parts of 1,1,2,2-tetrafluoroethyl ethyl ether to a reactor equipped with a stirring device and keeping the room temperature around 25° C.2. Turning on the stirring device, adding 32 parts of 1,1-dichloroethane and 2.5 parts of methanol respectively while stirring, and stirring for about 15 minutes to form a hydrofluoroether azeotrope.3. After the hydrofluoroether azeotrope is prepared in step 2, sequentially adding 0.05 parts of phenol and 0.1 parts of benzotriazole and stirring for about 15 minutes, respectively.4. Adding 0.2 parts of nano zinc oxide and 0.15 parts of nano alumina to the liquid prepared in step 3, and stirring at a high speed of 2000 rpm for 30 minutes to obtain the immersion type heat dissipation cooling liquid for the power lithium battery.5. Loading the immersion type heat dissipation cooling liquid for the power lithium battery prepared in step 4 into a plastic bucket, and storing it in a sealed state.

Example 3

An immersion type heat dissipation cooling liquid for power lithium battery is composed of the following components in weight ratios: 75 parts of 1,1,1,2,3,3-hexafluoro-3-methoxypropane (HFE-356mec); 22 parts of 1,1-dichloroethane; 2.8 parts of methanol; 0.05 parts of phenol; 0.1 parts of benzotriazole; 0.02 parts of nano titanium dioxide; 0.03 parts of nano alumina.

The method for preparing the immersion type heat dissipation cooling liquid for the power lithium battery described above is as follows:1. Adding 75 parts of 1,1,1,2,3,3-hexafluoro-3-methoxypropane (HFE-356mec) to a reactor equipped with a stirring device and keeping the room temperature around 25° C.2. Turning on the stirring device, adding 22 parts of 1,1-dichloroethane and 2.8 parts of methanol respectively while stirring, and stirring for about 15 minutes to form a hydrofluoroether azeotrope.3. After the hydrofluoroether azeotrope is prepared in step 2, sequentially adding 0.05 parts of phenol and 0.1 parts of benzotriazole and stirring for about 15 minutes, respectively.4. Adding 0.02 parts of nano titanium dioxide and 0.03 parts of nano alumina to the liquid prepared in step 3, and stirring at a high speed of 2000 rpm for 30 minutes to obtain the immersion type heat dissipation cooling liquid for the power lithium battery.5. Loading the immersion type heat dissipation cooling liquid for the power lithium battery prepared in step 4 into a plastic bucket, and storing it in a sealed state.

Embodiment 4

An immersion type heat dissipating cooling liquid for power lithium battery is composed of the following components in weight ratios: 53 parts of methyl nonafluorobutane (HFE-7100); 45 parts of 1,2-dichloroethylene; 2 parts of ethanol; 0.05 parts of phenol; 0.1 parts of benzotriazole; 0.02 parts of nano titanium dioxide; 0.03 parts of nano alumina.

The method for preparing the immersion type heat dissipation cooling liquid for the power lithium battery described above is as follows:1. Adding 53 parts of methyl nonafluorobutyl ether (HFE-7100) to a reactor equipped with a stirring device and keeping the room temperature around 25° C.2. Turning on the stirring device, adding 45 parts of 1,2-dichloroethylene and 2 parts of ethanol while stirring, and stirring for about 15 minutes to form a hydrofluoroether azeotrope.3. After the hydrofluoroether azeotrope is prepared in step 2, sequentially adding 0.05 parts of phenol and 0.1 parts of benzotriazole, and stirring for about 15 minutes, respectively.4. Adding 0.02 parts of nano titanium dioxide and 0.03 parts of nano alumina to the liquid prepared in step 3, and stirring at a high speed of 2,000 rpm for 30 minutes to obtain the immersion type heat dissipation cooling liquid for the power lithium battery.5. Loading the immersion type heat dissipation cooling liquid for the power lithium battery prepared in step 4 into a plastic bucket, and storing it in a sealed state.

Example 5

An immersion type heat dissipation cooling liquid for power lithium battery is composed of the following components in weight ratios: 55 parts of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethane ether (HFE-347); 42 parts of 1,1-dichloroethane; 2 parts of methanol; 0.05 parts of phenol; 0.1 parts of benzotriazole; 0.02 parts of nano titanium dioxide; 0.03 parts of nano alumina; 0.05 parts of nano zinc oxide.

The method for preparing the immersion type heat dissipation cooling liquid for a power lithium battery described above is as follows:1. Adding 55 parts of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (HFE-347) to a reactor equipped with a stirring device, keeping the room temperature around 25° C.2. Turning on the stirring device, adding 42 parts of 1,1-dichloroethane and 2 parts of methanol respectively while stirring, stirring for about 15 minutes to form a hydrofluoroether azeotrope.3. After the hydrofluoroether azeotrope is prepared in step 2, sequentially adding 0.05 parts of phenol and 0.1 parts of benzotriazole, and stirring for about 15 minutes, respectively.4. Adding 0.02 parts of nano titanium dioxide, 0.03 parts of nano alumina and 0.05 parts of nano zinc oxide to the liquid prepared in step 3, and stirring at a high speed of 2000 rpm for 30 minutes to prepare the immersion type heat dissipation cooling fluid for the power lithium battery.5. Loading the immersion type heat dissipation cooling liquid for the power lithium battery prepared in step 4 into a plastic bucket, and storing it in a sealed state.

In this context, the terms “including”, “comprising” or any other variant thereof are intended to cover non-exclusive inclusions, in addition to those listed elements, other elements not explicitly listed are also included.

In the case of no conflict, the above embodiments and the features in the embodiments herein can be combined with each other.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

INDUSTRIAL APPLICABILITY

1. The hydrofluoroether compound used in the present invention has a boiling point of 50° C. to 60° C., and the boiling point of the azeotrope formed by mixing with the halogenated hydrocarbon, the alcohol, and the like is 40° C. to 60° C. For the immersion type heat dissipation cooling liquid used in the power lithium battery packs, the heat dissipation is phase change heat dissipation, and the heat dissipation efficiency is high, so that the battery pack can be used in an extreme environment while maintaining a temperature that is most suitable for battery operation.

2. The cooling liquid material of the present invention has strong compatibility, and no chemical reaction will occur in the battery cell, the casing, and the components and materials immersed in the cooling liquid.

3. The non-conductive nano metal oxide used in the present invention is added as an additive and dispersed in the cooling liquid, which improves the specific surface and specific heat capacity of the cooling liquid, increases the chance of collision between particles, improves thermal conductivity, enhances the effect of liquid turbulence, and improves thermal distribution performance, reduces thermal gradients and eliminates thermal polarization.

4. The cooling liquid of the present invention has the characteristics of high specific heat, low expansion, low toxicity, high insulation, flame retardancy, inertness, strong material compatibility, and etc.