Preparation method of low-conductivity new energy power battery anti-freezing cooling liquid

Abstract

The invention discloses a low-conductivity new energy power battery anti-freezing cooling liquid preparation method, which belongs to the technical field of battery anti-freezing solutions, and comprises the following steps: (a) raw material selection and special treatment; (b) accurate proportioning and efficient premixing; (c) adding additives step by step and mixing with intensifying; (d) performing multi-stage precision filtration and deep purification; (e) strict quality detection and performance evaluation; (f) performing sterile filling and environment-friendly packaging; and (g) product identification, tracing and environmental protection declaration. According to the invention, high-purity water treated by a multi-stage reverse osmosis (RO) and electrodeionization (EDI) combined technology is adopted, and is further treated by ion exchange resin, so that the content of ions such as calcium and magnesium is remarkably reduced, the conductivity of the cooling liquid is extremely low, and the electrical failure risk of a battery system is reduced. The ethylene glycol raw material comes from biomass resources, the purity is up to 99.995% or above, and residual impurities are removed through special processes such as reduced pressure distillation and molecular distillation.

Description

Technical Field

[0001] The invention belongs to the technical field of battery antifreeze fluid, and specifically relates to a method for preparing low-conductivity antifreeze coolant for new energy power batteries. Background Art

[0002] In the cooling application of battery systems and other high-performance equipment, the performance of the coolant is directly related to the stability and safety of the system. Although the traditional coolant preparation technology can meet the basic cooling needs to a certain extent, its limitations are gradually revealed when facing the operation of modern high-precision and high-load equipment.

[0003] First, traditional coolants have deficiencies in conductivity control. Due to the limitations of the processing technology, coolants often contain a certain amount of metal ions such as calcium and magnesium. These ions are prone to electrical failures under the action of the electric field, posing a threat to the stable operation of the battery system. Therefore, it is particularly important to develop a coolant that can significantly reduce conductivity and reduce the risk of electrical failures. Secondly, the purity and stability of raw materials are also key factors affecting the performance of coolants. The ethylene glycol raw materials in traditional coolants are widely available, but the purity is often difficult to guarantee, and may contain residual impurities, which will reduce the purity and stability of the coolant, thereby affecting its service life and effect. In addition, the additive system of traditional coolants is relatively simple, and it is difficult to meet the high requirements of modern equipment for the anti-corrosion performance, thermal stability and environmental protection performance of coolants. With the continuous advancement of equipment technology, the comprehensive performance requirements for coolants are becoming higher and higher, and traditional additive systems have been unable to meet these requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a low-conductivity antifreeze coolant for new energy power batteries in view of the existing problems.

[0005] The present invention is achieved through the following technical solutions: A method for preparing a low-conductivity new energy power battery antifreeze coolant comprises the following steps: (a) Raw material selection and special treatment: Select high-purity water treated by multi-stage reverse osmosis (RO) and electrodeionization (EDI) technology, with a conductivity of less than 0.5μs / cm, and further treat it with ion exchange resin to reduce the content of specific ions; use ethylene glycol converted from biomass resources, with a purity of not less than 99.995% and a conductivity of less than 0.05μs / cm, and remove residual impurities through a special distillation process; prepare a set of composite additive systems including new organic corrosion inhibitors, high-efficiency antioxidants, environmentally friendly anti-foaming agents, precision pH regulators and innovative ion capture agents, among which the new organic corrosion inhibitors and high-efficiency antioxidants significantly improve the corrosion resistance and thermal stability of the coolant; (b) Accurate proportioning and efficient premixing: Use high-precision metering equipment to accurately weigh ethylene glycol, high-purity water and the first part of the composite additive (mainly including new organic corrosion inhibitors and high-efficiency antioxidants) according to the preset formula, and perform preliminary mixing under optimized stirring conditions to improve mixing efficiency; (c) Adding additives step by step and intensive mixing: After the premix is ​​uniform, add the second part of the composite additive (mainly including precision pH regulator and environmentally friendly antifoaming agent), and then use high-efficiency stirring equipment to intensively mix until all ingredients are completely uniform while avoiding the generation of bubbles; (d) Multi-stage precision filtration and deep purification: The mixed coolant is deeply purified through a multi-stage precision filter with a filtration accuracy of not less than 0.2 μm, and a nanofiltration step is added to remove tiny particles and bacteria to ensure that the coolant is clear, transparent and sterile; (e) Strict quality testing and performance evaluation: Conduct strict quality testing on the conductivity, freezing point, pH value, corrosion inhibition performance, thermal stability and environmental performance of the filtered coolant; (f) Aseptic filling and environmentally friendly packaging: In a filling environment that meets the cleanliness requirements, use an automated aseptic filling line for filling, and use recyclable, corrosion-resistant, and environmentally friendly packaging materials with good sealing properties for sealed packaging; (g) Product identification, traceability and environmental protection statement: Product information should be clearly marked on the product packaging, including production date, expiration date, batch number, manufacturer and environmental protection statement, and a complete product traceability system should be established.

[0006] Furthermore, the high-purity water is treated with ion exchange resin to further reduce the content of calcium, magnesium and other ions.

[0007] Furthermore, the special distillation process of ethylene glycol includes vacuum distillation and molecular distillation.

[0008] Furthermore, the preparation process of the novel organic corrosion inhibitor in the composite additive system specifically comprises the following steps: (1) Raw material selection and pretreatment: organic compounds containing benzene rings, heteroatoms (such as nitrogen, oxygen, sulfur) and functional groups (such as carboxyl, hydroxyl, amine) are selected as raw materials. The raw materials are pretreated by drying, grinding and screening. (2) Synthesis reaction: under the protection of inert gas, the pretreated raw materials are mixed with an appropriate amount of solvent and catalyst, and reacted at a temperature of 80-120°C and normal pressure. After the reaction is completed, the crude product is separated by cooling and precipitation. (3) Purification and separation: The crude product is dissolved in an appropriate solvent and purified by filtration, recrystallization or chromatography. The purified product is dried and stored; (4) Quality testing: The purified new organic corrosion inhibitor is subjected to quality testing, including purity determination (e.g., by high performance liquid chromatography), corrosion inhibition performance testing (e.g., by electrochemical corrosion experiments), and stability evaluation (e.g., by accelerated aging experiments). This ensures that the product meets the design requirements and can be used in the preparation of coolants.

[0009] Furthermore, the multi-stage precision filter includes a 0.2 μm microporous filter membrane and a nano filter.

[0010] Furthermore, the high-efficiency mixing equipment adopts a planetary mixer or a high-shear mixer, wherein the planetary mixer achieves efficient mixing and dispersing effects through its unique planetary motion trajectory, while the high-shear mixer uses its high-speed rotating shear blades to strongly shear and disperse the materials, thereby further improving the mixing efficiency and uniformity, ensuring that the components in the coolant are fully integrated and avoiding bubble generation.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The present invention uses high-purity water treated by multi-stage reverse osmosis (RO) and electrodeionization (EDI) technology, and further treated by ion exchange resin, which significantly reduces the content of calcium, magnesium and other ions, ensures that the conductivity of the coolant is extremely low, and reduces the risk of electrical failure of the battery system.

[0012] 2. The raw material of ethylene glycol comes from biomass resources with a purity of more than 99.995%. Residual impurities are removed through special processes such as vacuum distillation and molecular distillation, which improves the purity and stability of the coolant.

[0013] 3. The composite additive system includes new organic corrosion inhibitors, high-efficiency antioxidants, environmentally friendly antifoaming agents, precision pH regulators and innovative ion capture agents. These additives work synergistically to significantly improve the anti-corrosion performance, thermal stability and environmental performance of the coolant. The preparation process of the new organic corrosion inhibitor has been carefully designed, with strict raw material selection, optimized synthesis reaction conditions and refined purification steps, ensuring the high purity and excellent performance of the corrosion inhibitor.

[0014] 4. Use high-precision metering equipment and planetary mixers or high-shear mixers for precise proportioning and efficient mixing, ensuring full integration and uniformity of the coolant components and avoiding bubble generation. Multi-stage precision filters include 0.2μm microporous filter membranes and nano filters, which can deeply purify the coolant, remove tiny particles and bacteria, and ensure the coolant is clear, transparent and sterile. DETAILED DESCRIPTION Example

[0015] A method for preparing a low-conductivity new energy power battery antifreeze coolant comprises the following steps: (a) Raw material selection and special treatment: High-purity water treated by multi-stage reverse osmosis (RO) and electrodeionization (EDI) technology with a conductivity of 0.43μs / cm was selected, and further treated with ion exchange resin to reduce the content of specific ions; ethylene glycol converted from biomass resources was used with a purity of 99.998% and a conductivity of 0.03μs / cm, and residual impurities were removed through a special distillation process; a set of composite additive systems including new organic corrosion inhibitors, high-efficiency antioxidants, environmentally friendly anti-foaming agents, precision pH regulators and innovative ion capture agents were prepared, among which the new organic corrosion inhibitors and high-efficiency antioxidants significantly improved the corrosion resistance and thermal stability of the coolant; (b) Accurate proportioning and efficient premixing: Use high-precision metering equipment to accurately weigh ethylene glycol, high-purity water and the first part of the composite additive (mainly including new organic corrosion inhibitors and high-efficiency antioxidants) according to the preset formula, and perform preliminary mixing under optimized stirring conditions to improve mixing efficiency; (c) Adding additives step by step and intensive mixing: After the premix is ​​uniform, add the second part of the composite additive (mainly including precision pH regulator and environmentally friendly antifoaming agent), and then use high-efficiency stirring equipment to intensively mix until all ingredients are completely uniform while avoiding the generation of bubbles; (d) Multi-stage precision filtration and deep purification: The mixed coolant is deeply purified through a multi-stage precision filter with a filtration accuracy of 0.2μm, and a nanofiltration step is added to remove tiny particles and bacteria to ensure that the coolant is clear, transparent and sterile; (e) Strict quality testing and performance evaluation: Conduct strict quality testing on the conductivity, freezing point, pH value, corrosion inhibition performance, thermal stability and environmental performance of the filtered coolant; (f) Aseptic filling and environmentally friendly packaging: In a filling environment that meets the cleanliness requirements, use an automated aseptic filling line for filling, and use recyclable, corrosion-resistant, and environmentally friendly packaging materials with good sealing properties for sealed packaging; (g) Product identification, traceability and environmental protection statement: Product information should be clearly marked on the product packaging, including production date, expiration date, batch number, manufacturer and environmental protection statement, and a complete product traceability system should be established.

[0016] The high-purity water is further treated with ion exchange resin to reduce the content of calcium, magnesium and other ions.

[0017] The special distillation process of ethylene glycol includes vacuum distillation and molecular distillation.

[0018] The preparation process of the novel organic corrosion inhibitor in the composite additive system specifically comprises the following steps: (1) Raw material selection and pretreatment: Organic compounds containing benzene rings, nitrogen atoms and carboxyl functional groups are selected as raw materials, and the raw materials undergo pretreatment steps such as drying, grinding and screening; (2) Synthesis reaction: Under the protection of inert gas, the pretreated raw materials are mixed with an appropriate amount of solvent and catalyst, and reacted at 100°C and normal pressure. After the reaction is completed, the crude product is separated by cooling and precipitation; (3) Purification and separation: The crude product is dissolved in an appropriate solvent and purified by filtration, recrystallization or chromatography. The purified product is dried and stored; (4) Quality testing: The purified new organic corrosion inhibitor is subjected to quality testing, including purity determination (e.g., by high performance liquid chromatography), corrosion inhibition performance testing (e.g., by electrochemical corrosion experiments), and stability evaluation (e.g., by accelerated aging experiments). This ensures that the product meets the design requirements and can be used in the preparation of coolants.

[0019] The multi-stage precision filter comprises a 0.2 μm microporous filter membrane and a nano filter.

[0020] The high-efficiency mixing equipment adopts a planetary mixer, which achieves efficient mixing and dispersing effects through its unique planetary motion trajectory, thereby further improving the mixing efficiency and uniformity, ensuring that the components in the coolant are fully integrated and avoiding bubble generation.

[0021] Performance indicators of the low-conductivity new energy power battery antifreeze coolant preparation method embodiment:

[0022] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. A method for preparing a low-conductivity new energy power battery antifreeze coolant, characterized in that: The specific preparation steps are: (a) Raw material selection and special treatment: Select high-purity water treated by multi-stage reverse osmosis (RO) and electrodeionization (EDI) technology, with a conductivity of less than 0.5μs / cm, and further treat it with ion exchange resin to reduce the content of specific ions; use ethylene glycol converted from biomass resources, with a purity of not less than 99.995% and a conductivity of less than 0.05μs / cm, and remove residual impurities through a special distillation process; prepare a set of composite additive systems including new organic corrosion inhibitors, high-efficiency antioxidants, environmentally friendly antifoaming agents, precision pH regulators and innovative ion capture agents; (b) Accurate proportioning and efficient premixing: Use high-precision metering equipment to accurately weigh ethylene glycol, high-purity water and the first part of the composite additive (mainly including new organic corrosion inhibitors and high-efficiency antioxidants) according to the preset formula, and perform preliminary mixing by stirring; (c) Adding additives step by step and intensive mixing: After the premix is ​​uniform, add the second part of the composite additive (mainly including precision pH regulator and environmentally friendly antifoaming agent), and then use high-efficiency stirring equipment to intensively mix until all ingredients are completely uniform while avoiding the generation of bubbles; (d) Multi-stage precision filtration and deep purification: The mixed coolant is deeply purified through a multi-stage precision filter with a filtration accuracy of not less than 0.2 μm, and a nanofiltration step is added to remove tiny particles and bacteria to ensure that the coolant is clear, transparent and sterile; (e) Strict quality testing and performance evaluation: Conduct strict quality testing on the conductivity, freezing point, pH value, corrosion inhibition performance, thermal stability and environmental performance of the filtered coolant; (f) Aseptic filling and environmentally friendly packaging: In a filling environment that meets the cleanliness requirements, use an automated aseptic filling line for filling, and use recyclable, corrosion-resistant, and environmentally friendly packaging materials with good sealing properties for sealed packaging; (g) Product identification, traceability and environmental protection statement: Product information should be clearly marked on the product packaging, including production date, expiration date, batch number, manufacturer and environmental protection statement, and a complete product traceability system should be established.

2. According to the method for preparing a low-conductivity antifreeze coolant for new energy power batteries as described in claim 1, the high-purity water is further treated with ion exchange resin to further reduce the content of calcium, magnesium and other ions.

3. According to claim 1, a method for preparing a low-conductivity new energy power battery antifreeze coolant is characterized in that: The special distillation process of ethylene glycol includes vacuum distillation and molecular distillation.

4. According to claim 1, a method for preparing a low-conductivity new energy power battery antifreeze coolant is characterized in that: The specific preparation steps of the preparation process of the novel organic corrosion inhibitor in the composite additive system are as follows: The specific preparation process of the novel organic corrosion inhibitor in the composite additive system includes the following steps: (1) Raw material selection and pretreatment: Organic compounds containing benzene rings, heteroatoms (such as nitrogen, oxygen, sulfur) and functional groups (such as carboxyl, hydroxyl, amine) are selected as raw materials. The raw materials undergo pretreatment steps such as drying, grinding and screening; (2) Synthesis reaction: Under the protection of inert gas, the pretreated raw materials are mixed with an appropriate amount of solvent and catalyst, and the reaction is carried out at a temperature of 80-120°C and normal pressure. After the reaction is completed, the crude product is separated by cooling and precipitation; (3) Purification and separation: The crude product is dissolved in an appropriate solvent and purified by filtration, recrystallization or chromatography. The purified product is dried and stored; (4) Quality testing: The purified new organic corrosion inhibitor is subjected to quality testing, including purity determination (e.g., by high performance liquid chromatography), corrosion inhibition performance testing (e.g., by electrochemical corrosion experiments), and stability evaluation (e.g., by accelerated aging experiments). This ensures that the product meets the design requirements and can be used in the preparation of coolants.

5. According to claim 1, a method for preparing a low-conductivity new energy power battery antifreeze coolant is characterized in that: The multi-stage precision filter comprises a 0.2 μm microporous filter membrane and a nano filter.

6. According to claim 1, a method for preparing a low-conductivity new energy power battery antifreeze coolant is characterized in that: The high-efficiency stirring equipment is a planetary mixer or a high-shear mixer.

Images