Power battery separator, preparation method thereof and power battery comprising same

A power battery and diaphragm technology, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., and can solve problems such as functional failures

Active Publication Date: 2018-07-06
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a power battery separator, its preparation method and a power battery including the same, so as to solve the problem that the polyolefin separator in the prior art is prone to functional failure when the internal temperature of the battery is high or thermal runaway question

Method used

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  • Power battery separator, preparation method thereof and power battery comprising same

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preparation example Construction

[0031] In addition, the present invention also provides a method for preparing a power battery diaphragm, which includes the following steps: preparing a Pickering emulsion containing ceramic particles, a phase change material, a synthetic monomer of a polymer, a crosslinking agent, and an initiator; making the Pickering emulsion The synthetic monomers in the process are polymerized, and after forming the polymer, the emulsion is dried to obtain phase change capsules; the phase change capsules are mixed with the binder used to form the base material to form a material liquid to be cured; the material liquid to be cured is coated on The first modified layer and / or the second modified layer are formed on the first surface and / or the second surface of the diaphragm main body after being cured, so as to obtain the power battery diaphragm.

[0032] In the above preparation method provided by the present invention, the Pickering emulsion containing ceramic particles, phase change mat...

Embodiment 1

[0044] Silica surface treatment: ultrasonically disperse 1 g of silica particles in 50 mL of ethanol, add 1 g of γ-aminopropyltriethoxysilane, and stir at room temperature for 5 h. The temperature rose to 80°C, and condensed and refluxed for 2h. Centrifuge, wash with ethanol, and dry for later use.

[0045] Disperse 1 g of surface-treated silica particles with an average particle diameter of 400 nm in 100 g of water, raise the temperature to 70° C., and use the mixed solution as the water phase.

[0046] 10g of paraffin wax with a melting point of 52°C, 3g of styrene, 1g of divinylbenzene, 0.5g of chlorinated paraffin, and 1g of azobisisobutyronitrile were mixed and heated to 70°C to form a molten oil phase.

[0047] After mixing the oil phase and the water phase, carry out high-speed stirring for 10 minutes, and the stirring speed is not lower than 5000rar / min. Get Pickering Lotion.

[0048] Add 1 g of SDS as an emulsifier to the emulsion, and polymerize at a constant temp...

Embodiment 2

[0051] Disperse 0.5 g of surface-treated silica particles with an average particle diameter of 400 nm (the treatment method is the same as in Example 1) in 100 g of water, and heat up to 70° C., and the mixed solution is used as the water phase.

[0052] Mix 6g of paraffin wax with a melting point of 52°C, 1g of styrene, 1g of divinylbenzene, 1g of chlorinated paraffin, and 0.06g of azobisisobutyronitrile, then heat up to 70°C to form a molten oil phase .

[0053] After mixing the oil phase and the water phase, carry out high-speed stirring for 10 minutes, and the stirring speed is not lower than 5000rar / min. Get Pickering Lotion.

[0054] Add 1g of SDS to the emulsion, and polymerize at a constant temperature of 70°C for 10 hours to obtain phase-change capsules.

[0055]After mixing 2g of phase-change capsules with 20g of binder PTFE, coat both sides of the PP / PE / PP three-layer composite separator, and after curing, a power battery separator is obtained.

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Abstract

The invention provides a power battery separator, a preparation method thereof and a power battery comprising the same. The power battery diaphragm includes: a diaphragm body having a first surface and a second surface opposite to the first surface; and a first modified layer located on the first surface, and / or a second modified layer located on the second surface layer; the first modified layer and the second modified layer respectively include a base material and phase change capsules dispersed in the base material; wherein, the phase change capsule has a core-shell structure, and the shell layer of the phase change capsule includes polymer and dispersed Ceramic particles in polymer, phase change capsules include phase change material in the core layer. The thermal performance of the above-mentioned power battery separator is relatively high, and the failure probability of the diaphragm under high temperature or thermal runaway is relatively small, and the use of the separator can significantly improve the safety of the power battery.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a power battery separator, a preparation method thereof and a power battery comprising the same. Background technique [0002] The safety of the power battery system directly affects the safety of electric vehicles. For the safety research of the power battery system, it can be controlled from the system, module and battery level to ensure its safety to the greatest extent. The safety at the cell level is the root of the entire battery system, especially the power battery separator. Whether the current can be effectively cut off in the event of thermal runaway plays an important role in preventing safety accidents. [0003] At present, polyolefin diaphragm materials with microporous structure, such as single-layer or multi-layer films of polyethylene (PE) and polypropylene (PP), are used in commercial lithium-ion power batteries. Because the polyolefin microporous membr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/409H01M50/434H01M50/443H01M50/457
CPCH01M50/403H01M50/409H01M50/443Y02E60/10
Inventor 王彦红杨重科秦兴权
Owner BEIJING ELECTRIC VEHICLE
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