A battery coolant and graphene liquid cooling plate thereof

Abstract

The present application relates to the field of battery cooling technology, and specifically discloses a battery coolant and a graphene liquid cooling plate thereof. A battery coolant of the present application comprises the following raw materials in parts by weight: 80-90 parts of propylene glycol, 10-20 parts of toluene solution, 5-8 parts of sulfonate dispersant, 1-2 parts of antifreeze, 1-2 parts of rust inhibitor, 1-2 parts of mildew inhibitor, pH adjuster, and the pH adjuster is used to adjust the pH value of the coolant to 7-8; a graphene liquid cooling plate comprises a liquid cooling plate and a graphene plate made of the above-mentioned battery coolant, the graphene plate is connected to the battery, and the liquid cooling plate is located on the side of the graphene plate away from the battery and is connected to the graphene plate. The battery coolant of the present application has the effect of increasing the fluidity of propylene glycol in winter and improving the cooling effect of the battery coolant.

Description

Technical Field

[0001] The present application relates to the field of battery cooling technology, and more specifically, it relates to a battery coolant and a graphene liquid cooling plate thereof. Background Art

[0002] As the power source of the car, the battery of a new energy vehicle will always generate heat during charging and discharging. The performance of the power battery is closely related to the battery temperature. The existing power battery cooling systems include air conditioning cooling, liquid cooling and air cooling. The working principle of the liquid-cooled power battery cooling system is: the electric coolant pump delivers coolant through the coolant circulation loop to cool the power battery.

[0003] In the related art, the patent with application number CN202110943511.7 discloses an environmentally friendly anhydrous coolant, comprising 1 to 6 parts by weight of a metal corrosion inhibitor, 0.3 to 1 parts by weight of a fluorinated liquid, 0.3 to 2 parts by weight of a dispersant, 0.01 to 4 parts by weight of a defoaming agent, 0.26 to 0.9 parts by weight of an acid-base regulator and 90 to 140 parts by weight of an antifreeze; the antifreeze is ethylene glycol and / or propylene glycol.

[0004] With respect to the above-mentioned related technologies, the inventors believe that since the main components of anhydrous coolant are ethylene glycol or propylene glycol, they have good fluidity at high temperatures and are therefore often used in racing cars; however, ordinary cars using anhydrous coolant may experience poor flow of the anhydrous coolant and poor cooling effect in winter. Summary of the invention

[0005] In order to improve the fluidity of anhydrous coolant in winter and enhance the cooling effect; the present application provides a battery coolant and a graphene liquid cooling plate thereof.

[0006] In a first aspect, the present application provides a battery coolant, which adopts the following technical solution:

[0007] A battery coolant comprises the following raw materials in parts by weight: 80-90 parts of propylene glycol, 10-20 parts of toluene solution, 5-8 parts of sulfonate dispersant, 1-2 parts of antifreeze agent, 1-2 parts of rust inhibitor, 1-2 parts of mildew inhibitor, and pH regulator, wherein the pH regulator is used to adjust the pH value of the coolant to 7-8.

[0008] By adopting the above technical solution, since toluene has a higher ignition point and a lower freezing point, the freezing point of toluene is -95°C, and toluene is liquid and usually used as a solvent with good fluidity; while propylene glycol, which accounts for a large part of the coolant, is viscous at room temperature, and its viscosity further increases as the temperature decreases. Therefore, the addition of toluene can increase the fluidity of propylene glycol in winter and enhance the cooling effect of the battery coolant.

[0009] Sulfonate dispersants can mix toluene, propylene glycol and other additives evenly, and can increase the contact area between toluene and propylene glycol, thereby increasing the fluidity of propylene glycol in winter. Sulfonate dispersants can also prevent rust and clean, are cheap, and are economical, making them suitable for addition to battery coolants.

[0010] Optionally, the sulfonate dispersant is sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium hexadecyl sulfonate or α-olefin sulfonate.

[0011] By adopting the above technical scheme, sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium hexadecyl sulfonate or α-olefin sulfonate can not only act as a dispersant to disperse the solid particles, but also act as a surfactant to reduce the surface tension between two mutually immiscible phases, so that the coolant mixing uniformity is better and the fluidity is further improved.

[0012] Optionally, the solvent of the toluene solution is ethanol.

[0013] By adopting the above technical solution, ethanol has a high ignition point and a freezing point of -114°C, which is suitable as a coolant, and toluene can be well soluble in ethanol; propylene glycol and ethanol can also be soluble in each other, so the mixing uniformity of the battery coolant is better.

[0014] Optionally, in the toluene solution, the volume ratio of toluene to ethanol is 1:(0.1-0.5).

[0015] By adopting the above technical solution, the appropriate volume ratio of toluene to ethanol can enable toluene to be well mixed with propylene glycol through the ethanol solvent to obtain a uniformly mixed battery coolant.

[0016] Optionally, the pH value of the cooling liquid is 7.5-8.

[0017] By adopting the above technical solution, the coolant with suitable pH can effectively inhibit the acidification of alcohol substances, does not affect the alcohol substances to lower the freezing point of the antifreeze, and has antifreeze and anti-boiling properties.

[0018] Optionally, the pH adjuster is a boric acid buffer solution or a phosphate buffer solution.

[0019] By adopting the above technical solution, since borates and phosphates have an anti-corrosion effect, the use of boric acid buffer solution or phosphate buffer solution to adjust the pH of the battery coolant can also play an anti-corrosion role on the battery.

[0020] Optionally, the cooling liquid comprises the following preparation steps:

[0021] S1: Mix and stir propylene glycol, sulfonate dispersant, antifreeze agent, rust inhibitor, and mildew inhibitor to obtain a primary battery coolant;

[0022] S2: adding the toluene solution to the primary battery coolant, mixing and stirring to obtain a stock solution of the battery coolant;

[0023] S3: Using a pH adjuster to adjust the pH of the battery coolant stock solution to obtain a battery coolant.

[0024] By adopting the above technical solution, the purpose of adding toluene to S2 and then adding primary battery coolant is to enable the toluene to be mixed with the primary battery coolant more quickly and evenly to obtain the coolant.

[0025] Optionally, in S2, after stirring, the following step is further included: passing the battery coolant into an anion and cation mixed exchange resin to remove ions to obtain a battery coolant stock solution.

[0026] By adopting the above technical solution, the purpose of using anion and cation mixed exchange resin is to remove excess ions in the coolant, reduce the conductivity of the coolant, do not affect the proton exchange of the fuel cell, and obtain a battery coolant with better quality.

[0027] In a second aspect, the present application provides a graphene liquid cooling plate, which adopts the following technical solution:

[0028] A graphene liquid cooling plate comprises a liquid cooling plate made of the above-mentioned battery cooling liquid and a graphene plate, wherein the graphene plate is connected to the battery, and the liquid cooling plate is located on a side of the graphene plate away from the battery and is connected to the graphene plate.

[0029] By adopting the above technical solution, the graphene film has excellent thermal conductivity, which further promotes the conduction of heat from the battery surface to the coolant, thereby uniformly cooling the battery surface and improving the temperature uniformity of the battery surface.

[0030] Optionally, a polytetrafluoroethylene hose is embedded on the liquid cooling plate surface, and the battery coolant circulates in the polytetrafluoroethylene hose.

[0031] By adopting the above technical solution, the tetrafluoroethylene hose is not stained with oil or water, and the flow speed of the coolant in the tetrafluoroethylene hose can be accelerated, thereby improving the cooling effect of the graphene liquid cooling plate.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. In the present application, toluene is in liquid form and is usually used as a solvent with a good mobile phase; while propylene glycol, which accounts for a large part of the coolant, is viscous at room temperature, and its viscosity further increases as the temperature decreases. Therefore, the addition of toluene can increase the fluidity of propylene glycol in winter and improve the cooling effect of the battery coolant;

[0034] 2. In this application, ethanol has a high ignition point and a freezing point of -114°C, which is suitable as a coolant, and toluene is well miscible with ethanol; propylene glycol and ethanol are also miscible, so the mixing uniformity of the battery coolant is good;

[0035] 3. In the present application, the coolant with suitable pH can effectively inhibit the acidification of alcohol substances, does not affect the alcohol substances to lower the freezing point of the antifreeze, and has antifreeze and anti-boiling properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram intended to show the structure of a graphene liquid cooling plate.

[0037] Explanation of the accompanying drawings: 1. Liquid cooling plate; 2. Graphene plate; 3. Polytetrafluoroethylene hose; 4. Battery. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0039] The sources of raw materials for the following embodiments and comparative examples are provided: the raw materials for the embodiments and comparative examples can be purchased commercially, antifreeze, model: 987, brand: Hongtai; rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of the boric acid buffer solution is 0.1 mol / L; the anion and cation exchange resin is anion and cation exchange resin D201, purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; toluene is 1,3,5-trimethylbenzene, analytical grade: 97%.

[0040] Embodiment of a battery coolant

[0041] Example 1

[0042] A battery coolant, the preparation steps of which are:

[0043] S1: 80 g of propylene glycol, 5 g of sodium dodecylbenzene sulfonate, 2 g of antifreeze agent, 1 g of rust inhibitor, and 2 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant;

[0044] S2: Add 20g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions;

[0045] S3: Using boric acid buffer solution, the pH of the battery coolant stock solution is adjusted to 7.5 to obtain a battery coolant.

[0046] Example 2

[0047] A battery coolant, the preparation steps of which are:

[0048] S1: 90 g of propylene glycol, 8 g of sodium hexadecyl sulfate, 1 g of antifreeze, 2 g of rust inhibitor, and 1 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant;

[0049] S2: Add 10g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions;

[0050] S3: Using a phosphate buffer solution, the pH of the battery coolant stock solution is adjusted to 7.5 to obtain a battery coolant.

[0051] Example 3

[0052] A battery coolant, the preparation steps of which are:

[0053] S1: 85 g of propylene glycol, 6.5 g of sodium dodecylbenzene sulfonate, 1.5 g of antifreeze agent, 1.5 g of rust inhibitor, and 1.5 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant;

[0054] S2: Add 15g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions;

[0055] S3: Using boric acid buffer solution, the pH of the battery coolant stock solution is adjusted to 7.5 to obtain a battery coolant.

[0056] Example 4

[0057] The difference from Example 3 is that in S2, the volume ratio of toluene to ethanol is 1:0.1.

[0058] Example 5

[0059] The difference from Example 3 is that in S2, the volume ratio of toluene to ethanol is 1:0.5.

[0060] Example 6

[0061] The difference from Example 3 is that in S3, the pH of the battery coolant stock solution is adjusted to 8 using a boric acid buffer solution.

[0062] Comparative Example 1

[0063] The difference from Example 3 is that in S2, the toluene solution is replaced with an equal weight of water.

[0064] Comparative Example 2

[0065] The difference from Example 3 is that in S2, the toluene solution is replaced with an equal weight of toluene.

[0066] Comparative Example 3

[0067] The difference from Example 3 is that in S2, sodium dodecylbenzene sulfonate is replaced by an equal weight of vinyl bisstearamide.

[0068] Comparative Example 4

[0069] The difference from Example 3 is that in S3, the pH of the battery coolant stock solution is adjusted to 5 using a phosphate buffer solution.

[0070] Comparative Example 5

[0071] The waterless coolant purchased on the market is Aiwen brand NPG+ waterless coolant.

[0072] Performance testing

[0073] The coolants prepared in Examples 1 to 6 and Comparative Examples 1 to 5 were used for performance testing to detect the viscosity and boiling point at 25°C; testing instruments: HTYZL-H fully automatic tension tester, DY23F brake fluid tester; the test results are shown in Table 1; the viscosities of the coolants of Example 3 and Comparative Example 5 at different temperatures were tested; the test results are shown in Table 2;

[0074] Table 1

[0075] Viscosity(MPa.s) Boiling point(℃) Example 1 6.5 120 Example 2 6.7 113 Example 3 5.8 123 Example 4 7.2 115 Example 5 7.5 112 Example 6 6.3 121 Comparative Example 1 10.3 143 Comparative Example 2 8.5 117 Comparative Example 3 7.6 114 Comparative Example 4 7.3 112 Comparative Example 5 45 191

[0076] Table 2

[0077]

[0078]

[0079] In combination with Examples 1, 2 and 3, it can be seen that the refrigerant liquids obtained by the refrigerant liquid raw material ratios within the protection scope of the present application have low viscosities and boiling points that meet the boiling points for normal use.

[0080] Combining Examples 3, 4 and 5, it can be seen that the ratio of toluene to ethanol in the three examples is different, which affects the viscosity and boiling point of the obtained refrigerant, proving that the ratio of toluene to ethanol is very important. The preferred volume ratio of the present application is toluene: ethanol is 1:0.25.

[0081] Combining Examples 3 and 6 and Comparative Example 4, it can be seen that when the pH of the refrigerant is in the range of 7-8, the viscosity of the refrigerant is low and the boiling point is appropriate; when the pH of the refrigerant is in the range of 7-8, the viscosity of the refrigerant increases.

[0082] Combining Example 3 with Comparative Examples 1 and 2, it can be seen that when the toluene solution in the present application is replaced with water or analytically pure toluene, the viscosity of the obtained refrigerant is reduced, proving that the toluene solution in the present application cannot be replaced at will.

[0083] Combining Example 3 and Comparative Example 3, it can be seen that replacing the sulfonic acid dispersant with vinyl bisstearamide also has an effect on the viscosity of the prepared refrigerant, and the viscosity is higher than that of Example 3, proving that the sulfonic acid dispersant of the present application cannot be replaced at will.

[0084] In Table 2, it can be seen from the combination of Example 3 and Comparative Example 5 that as the temperature decreases, the refrigerant prepared in Example 3 can still flow naturally at its viscosity, while the refrigerant in Comparative Example 5 cannot flow normally at its viscosity at -10°C, and directly condenses at -25°C; this proves that the anhydrous coolant of the present application can still be used normally in ordinary cars in winter compared to commercially available anhydrous coolants.

[0085] Embodiment of a graphene liquid cooling plate

[0086] Reference Figure 1 A graphene liquid cooling plate includes a liquid cooling plate 1 and a graphene plate 2, the graphene plate 2 is attached to a battery 4 and fixedly connected, and the liquid cooling plate 1 is attached to the graphene plate 2 and fixedly connected. A polytetrafluoroethylene hose 3 is embedded in the liquid cooling plate 1, and the polytetrafluoroethylene hose 3 is arranged in a snake shape on the liquid cooling plate 1. One side of the liquid cooling plate 1 where the polytetrafluoroethylene hose 3 is embedded is attached to the graphene plate 2. The battery coolant prepared in Example 3 flows in the polytetrafluoroethylene hose 3 through an electric coolant pump.

[0087] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A battery coolant, characterized in that: The preparation steps are: S1: 80 g of propylene glycol, 5 g of sodium dodecylbenzene sulfonate, 2 g of antifreeze agent, 1 g of rust inhibitor, and 2 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant; S2: Add 20g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions; S3: adjusting the pH of the battery coolant stock solution to 7.5 using a boric acid buffer solution to obtain a battery coolant; Antifreeze, model: 987, brand: Hongtai; rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of boric acid buffer solution is 0.1 mol / L; anion and cation exchange resin is anion and cation exchange resin D201, purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; toluene is 1,3,5-trimethylbenzene, analytical grade: 97%.

2. A battery coolant, characterized in that: The preparation steps are: S1: 90 g of propylene glycol, 8 g of sodium hexadecyl sulfate, 1 g of antifreeze, 2 g of rust inhibitor, and 1 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant; S2: Add 10g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions; S3: adjusting the pH of the battery coolant stock solution to 7.5 using a phosphate buffer solution to obtain a battery coolant; Antifreeze, model: 987, brand: Hongtai; rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of boric acid buffer solution is 0.1 mol / L; anion and cation exchange resin is anion and cation exchange resin D201, purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; toluene is 1,3,5-trimethylbenzene, analytical grade: 97%.

3. A battery coolant, the preparation steps of which are: S1: 85 g of propylene glycol, 6.5 g of sodium dodecylbenzene sulfonate, 1.5 g of antifreeze agent, 1.5 g of rust inhibitor, and 1.5 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant; S2: Add 15g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions; S3: adjusting the pH of the battery coolant stock solution to 7.5 using a boric acid buffer solution to obtain a battery coolant; Antifreeze, model: 987, brand: Hongtai; rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of boric acid buffer solution is 0.1 mol / L; anion and cation exchange resin is anion and cation exchange resin D201, purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; toluene is 1,3,5-trimethylbenzene, analytical grade: 97%.

4. A battery coolant, the preparation steps of which are: S1: 85 g of propylene glycol, 6.5 g of sodium dodecylbenzene sulfonate, 1.5 g of antifreeze agent, 1.5 g of rust inhibitor, and 1.5 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant; S2: Add 15g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.1, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions; S3: adjusting the pH of the battery coolant stock solution to 7.5 using a boric acid buffer solution to obtain a battery coolant; Antifreeze, model: 987, brand: Hongtai; rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of boric acid buffer solution is 0.1 mol / L; anion and cation exchange resin is anion and cation exchange resin D201, purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; toluene is 1,3,5-trimethylbenzene, analytical grade: 97%.

5. A battery coolant, the preparation steps of which are: S1: 85 g of propylene glycol, 6.5 g of sodium dodecylbenzene sulfonate, 1.5 g of antifreeze agent, 1.5 g of rust inhibitor, and 1.5 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant; S2: 15 g of toluene solution was added to the primary battery coolant, the solvent of the toluene solution was ethanol, the volume ratio of toluene to ethanol was 1:0.5, and the solution was stirred at 4000 rpm for 15 min. The battery coolant was passed through an anion and cation mixed exchange resin to remove ions and obtain a stock solution of the battery coolant; S3: adjusting the pH of the battery coolant stock solution to 7.5 using a boric acid buffer solution to obtain a battery coolant; Antifreeze, model: 987, brand: Hongtai; rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of boric acid buffer solution is 0.1 mol / L; anion and cation exchange resin is anion and cation exchange resin D201, purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; toluene is 1,3,5-trimethylbenzene, analytical grade: 97%.

6. A battery coolant, the preparation steps of which are: S1: 85 g of propylene glycol, 6.5 g of sodium dodecylbenzene sulfonate, 1.5 g of antifreeze agent, 1.5 g of rust inhibitor, and 1.5 g of mildew inhibitor were mixed and stirred at a speed of 500 rpm for 20 min to obtain a primary battery coolant; S2: Add 15g of toluene solution to the primary battery coolant, the solvent of the toluene solution is ethanol, the volume ratio of toluene to ethanol is 1:0.25, and stir at a speed of 4000rpm for 15min, pass the battery coolant into anion and cation mixed exchange resin, and obtain the battery coolant stock solution after removing ions; S3: adjusting the pH of the battery coolant stock solution to 8 using a boric acid buffer solution to obtain a battery coolant; Antifreeze, model: 987, brand: Hongtai; Rust inhibitor, model: BL-W2, brand: Bolaiful Chemical; mildew inhibitor, model: BIT20, purchased from Changzhou Jinhudun New Material Technology Co., Ltd.; the concentration of boric acid buffer solution is 0.1 mol / L; The anion and cation exchange resin was anion and cation exchange resin D201 purchased from Tianjin Jinda Zhengtong Environmental Protection Technology Co., Ltd.; the toluene was 1,3,5-trimethylbenzene, analytical grade: 97%.

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