A fireproof coating for lithium-ion power battery pack and preparation method thereof

Abstract

The invention belongs to the technical field of lithium ion battery, and in particular, relates to a fireproof coating layer for a lithium ion power battery pack and a preparation method thereof. Thefireproof coating layer consists of the following components by the weight percentage: 15 to 55% of sodium phosphate, 5% to 15% of modified amino resin, 2 to 6% of titanium dioxide, 2 to 8% of dimethyl phthalate, 1 to 5% of dimethylaniline, 1 to 5% of epoxy chloroethane, and 30 to 70% of a solvent. Compared with the prior art, the inner wall or an outer shell of the battery pack is coated with thespecially prepared fireproof coating layer, therefore, when the battery pack is burned, the fireproof coating layer can isolate the battery pack and a shell body for as long as two hours or more under a condition of open fire, the combustion is prevented from spreading quickly to other parts of a vehicle, enough time is left for the personnel on the vehicle to safely withdraw, malignant personnelcasualty accidents are avoided from being generated and the safety performance of the lithium ion battery pack is effectively improved.

Description

technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a fireproof coating for lithium-ion power battery packs and a preparation method thereof. Background technique

[0002] At present, with the development of the new energy industry, more and more car companies are gradually using electric vehicles to replace traditional fuel vehicles; the most important indicator of electric vehicles is their safety performance; at this stage, almost all batteries used in electric vehicles are It is composed of thousands of battery cells connected in series and parallel; thermal runaway of one of the battery cells has a high probability of being transmitted to the entire battery pack, causing serious accidents; Be careful that accidents such as accidental collisions may also cause the entire battery pack to burn. The heat released by the lithium-ion battery when it burns will cause the combustibles in the car to burn rap...

Examples

Embodiment 1

[0033] A fireproof coating for lithium-ion power battery packs, comprising the following composition by weight percentage:

[0034] Sodium Phosphate 55%

[0035] Modified amino resin 5%

[0036] Titanium dioxide 4%

[0037] Dimethyl phthalate 2%

[0038] Dimethylaniline 1%

[0039] Oxychloroethylene 3%

[0040] Solvent 30%.

[0041] The solvent is one or more of deionized water, methanol, propanol, n-butanol, ethylene glycol, isopropanol, acetone, petroleum ether, tetrahydrofuran, ethyl acetate, and butyl acetate.

[0042] The preparation method of this fireproof coating comprises the following steps:

[0043] Step 1: Weigh sodium phosphate, titanium dioxide, and modified amino resin into the reaction kettle according to the proportion, add an appropriate amount of solvent, heat up to 60°C, and stir for 40 minutes to obtain mixture A; Step 2: Weigh o-benzene according to the proportion Dimethyl diformate is added to the mixture obtained in step 1, stirred evenly, and th...

Embodiment 2

[0045] A fireproof coating for lithium-ion power battery packs, comprising the following composition by weight percentage:

[0046] Sodium Phosphate 50%

[0047] Modified amino resin 5%

[0048] Titanium dioxide 4%

[0049] Dimethyl phthalate 2%

[0050] Dimethylaniline 1%

[0051] Oxychloroethylene 3%

[0052] Solvent 30%

[0053] Borate 5%.

[0054] The solvent is one or more of deionized water, methanol, propanol, n-butanol, ethylene glycol, isopropanol, acetone, petroleum ether, tetrahydrofuran, ethyl acetate, and butyl acetate.

[0055] The borate is at least one of aluminum borate, zinc borate, sodium borate and ammonium borate.

[0056] The preparation method of this fireproof coating comprises the following steps:

[0057] Step 1: Weigh sodium phosphate, borate, titanium dioxide, and modified amino resin into the reaction kettle according to the proportion, add an appropriate amount of solvent, heat up to 90°C, and stir for 20 minutes to obtain mixture A; Step ...

Embodiment 3

[0059] A fireproof coating for lithium-ion power battery packs, comprising the following composition by weight percentage:

[0060] Sodium Phosphate 50%

[0061]Modified amino resin 5%

[0062] Titanium dioxide 4%

[0063] Dimethyl phthalate 2%

[0064] Dimethylaniline 1%

[0065] Oxychloroethylene 3%

[0066] Solvent 30%

[0067] Anhydrous Sulfite 5%.

[0068] The solvent is one or more of deionized water, methanol, propanol, n-butanol, ethylene glycol, isopropanol, acetone, petroleum ether, tetrahydrofuran, ethyl acetate, and butyl acetate.

[0069] The anhydrous sulfite is at least one of anhydrous sodium sulfite, anhydrous potassium sulfite and anhydrous magnesium sulfite.

[0070] The preparation method of this fireproof coating comprises the following steps:

[0071] Step 1: Weigh sodium phosphate, anhydrous sulfite, titanium dioxide, and modified amino resin into the reaction kettle according to the proportion, add an appropriate amount of solvent, heat up to 70...

technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a fireproof coating for lithium-ion power battery packs and a preparation method thereof. Background technique

[0002] At present, with the development of the new energy industry, more and more car companies are gradually using electric vehicles to replace traditional fuel vehicles; the most important indicator of electric vehicles is their safety performance; at this stage, almost all batteries used in electric vehicles are It is composed of thousands of battery cells connected in series and parallel; thermal runaway of one of the battery cells has a high probability of being transmitted to the entire battery pack, causing serious accidents; Be careful that accidents such as accidental collisions may also cause the entire battery pack to burn. The heat released by the lithium-ion battery when it burns will cause the combustibles in the car to burn rap...

Examples

Embodiment 1

[0033] A fireproof coating for lithium-ion power battery packs, comprising the following composition by weight percentage:

[0034] Sodium Phosphate 55%

[0035] Modified amino resin 5%

[0036] Titanium dioxide 4%

[0037] Dimethyl phthalate 2%

[0038] Dimethylaniline 1%

[0039] Oxychloroethylene 3%

[0040] Solvent 30%.

[0041] The solvent is one or more of deionized water, methanol, propanol, n-butanol, ethylene glycol, isopropanol, acetone, petroleum ether, tetrahydrofuran, ethyl acetate, and butyl acetate.

[0042] The preparation method of this fireproof coating comprises the following steps:

[0043] Step 1: Weigh sodium phosphate, titanium dioxide, and modified amino resin into the reaction kettle according to the proportion, add an appropriate amount of solvent, heat up to 60°C, and stir for 40 minutes to obtain mixture A; Step 2: Weigh o-benzene according to the proportion Dimethyl diformate is added to the mixture obtained in step 1, stirred evenly, and th...

Embodiment 2

[0045] A fireproof coating for lithium-ion power battery packs, comprising the following composition by weight percentage:

[0046] Sodium Phosphate 50%

[0047] Modified amino resin 5%

[0048] Titanium dioxide 4%

[0049] Dimethyl phthalate 2%

[0050] Dimethylaniline 1%

[0051] Oxychloroethylene 3%

[0052] Solvent 30%

[0053] Borate 5%.

[0054] The solvent is one or more of deionized water, methanol, propanol, n-butanol, ethylene glycol, isopropanol, acetone, petroleum ether, tetrahydrofuran, ethyl acetate, and butyl acetate.

[0055] The borate is at least one of aluminum borate, zinc borate, sodium borate and ammonium borate.

[0056] The preparation method of this fireproof coating comprises the following steps:

[0057] Step 1: Weigh sodium phosphate, borate, titanium dioxide, and modified amino resin into the reaction kettle according to the proportion, add an appropriate amount of solvent, heat up to 90°C, and stir for 20 minutes to obtain mixture A; Step ...

Embodiment 3

[0059] A fireproof coating for lithium-ion power battery packs, comprising the following composition by weight percentage:

[0060] Sodium Phosphate 50%

[0061]Modified amino resin 5%

[0062] Titanium dioxide 4%

[0063] Dimethyl phthalate 2%

[0064] Dimethylaniline 1%

[0065] Oxychloroethylene 3%

[0066] Solvent 30%

[0067] Anhydrous Sulfite 5%.

[0068] The solvent is one or more of deionized water, methanol, propanol, n-butanol, ethylene glycol, isopropanol, acetone, petroleum ether, tetrahydrofuran, ethyl acetate, and butyl acetate.

[0069] The anhydrous sulfite is at least one of anhydrous sodium sulfite, anhydrous potassium sulfite and anhydrous magnesium sulfite.

[0070] The preparation method of this fireproof coating comprises the following steps:

[0071] Step 1: Weigh sodium phosphate, anhydrous sulfite, titanium dioxide, and modified amino resin into the reaction kettle according to the proportion, add an appropriate amount of solvent, heat up to 70...