Positive temperature coefficient (PTC) material used for heat safety protection of lithium ion battery, and application thereof

Abstract

The invention relates to the technical field of the production of lithium ion batteries, and provides a positive temperature coefficient material used for heat safety protection of a lithium ion battery, and an application thereof. The positive temperature coefficient material is prepared through mixing 30-35% by mass of an epoxy resin A adhesive, 30-35% by mass of an epoxy resin B adhesive, 25-35% by mass of Super-P, and 5-8% by mass of Al2O3. The positive temperature coefficient material has the advantages of stable PTC characteristic, small resistance at room temperature, appropriate lift-drag ratio, and good cycle performance, and provides a safe mechanism for the overheat protection of the lithium ion batteries.

Description

technical field

[0001] The invention relates to the technical field of lithium ion battery production, in particular to a positive temperature coefficient material suitable for thermal safety protection of lithium ion batteries and its application. Background technique

[0002] Positive temperature coefficient materials are PTC materials. PTC materials have PTC characteristics. The so-called PTC (positive temperature coefficient) characteristics are that within a certain temperature range, the resistivity of the material itself will increase with the increase of temperature. Conductors with PTC characteristics can be made into thermistors, which can be used in overcurrent protection measures for circuits, thermal safety protection measures for lithium-ion batteries, and can also be made into self-controlling heating bodies for thermal insulation and heating facilities .

[0003] In principle, PTC materials suitable for thermal safety protection measures for lithium-ion batt...

Examples

Embodiment 1

[0028] (1) First mix epoxy resin A glue (561A glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) with epoxy resin B glue (561B glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) to get epoxy resin AB glue , and then epoxy resin AB glue, Super-P and Al 2 o 3 Mix evenly to obtain the mixed material, add 60% absolute ethanol by weight of the mixed material, and mix thoroughly to make a slurry; epoxy resin A glue, epoxy resin B glue, Super-P and Al 2 o 3 The ratio is shown in Table 1, Al 2 o 3 The particle size is 1-3 microns;

[0029] (2) Evenly coat the slurry prepared in step (1) on the surface of aluminum foil (thickness 10 microns), and the coating thickness is 2 microns;

[0030] (3) LiFePO 4 The carbon film electrode rolled from the powder (the thickness of the carbon film electrode is 80 microns) is pressed with the aluminum foil coated with slurry on the surface obtained in step (2) (compression rate is 70%), and vacuum dried at 50°C to obtain a lithium-ion battery P...

Embodiment 2

[0032] (1) First mix epoxy resin A glue (561A glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) with epoxy resin B glue (561B glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) to get epoxy resin AB glue , and then epoxy resin AB glue, Super-P and Al 2 o 3 Mix evenly to obtain the mixed material, add 70% absolute ethanol by weight of the mixed material, and mix thoroughly to make a slurry; epoxy resin A glue, epoxy resin B glue, Super-P and Al 2 o 3 The ratio is shown in Table 1, Al 2 o 3 The particle size is 1-3 microns;

[0033](2) Evenly coat the slurry prepared in step (1) on the surface of aluminum foil (thickness 10 microns), and the coating thickness is 5 microns;

[0034] (3) LiFePO 4 The carbon film electrode rolled from the powder (the thickness of the carbon film electrode is 150 microns) is pressed with the aluminum foil coated with slurry on the surface obtained in step (2) (compression ratio is 70%), and vacuum-dried at 60°C to obtain a lithium-ion battery ...

Embodiment 3

[0036] (1) First mix epoxy resin A glue (561A glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) with epoxy resin B glue (561B glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) to get epoxy resin AB glue , and then epoxy resin AB glue, Super-P and Al 2 o 3 Mix evenly to obtain the mixed material, add 65% absolute ethanol by weight of the mixed material, and mix thoroughly to make a slurry; epoxy resin A glue, epoxy resin B glue, Super-P and Al 2 o 3 The ratio is shown in Table 1, Al 2 o 3 The particle size is 1-3 microns;

[0037] (2) Evenly coat the slurry prepared in step (1) on the surface of aluminum foil (thickness 10 microns), and the coating thickness is 3 microns;

[0038] (3) LiFePO 4 The carbon film electrode rolled from the powder (the thickness of the carbon film electrode is 100 microns) is pressed with the aluminum foil coated with slurry on the surface obtained in step (2) (compression rate is 70%), and vacuum-dried at 55°C to obtain a lithium-ion battery ...

technical field

[0001] The invention relates to the technical field of lithium ion battery production, in particular to a positive temperature coefficient material suitable for thermal safety protection of lithium ion batteries and its application. Background technique

[0002] Positive temperature coefficient materials are PTC materials. PTC materials have PTC characteristics. The so-called PTC (positive temperature coefficient) characteristics are that within a certain temperature range, the resistivity of the material itself will increase with the increase of temperature. Conductors with PTC characteristics can be made into thermistors, which can be used in overcurrent protection measures for circuits, thermal safety protection measures for lithium-ion batteries, and can also be made into self-controlling heating bodies for thermal insulation and heating facilities .

[0003] In principle, PTC materials suitable for thermal safety protection measures for lithium-ion batt...

Examples

Embodiment 1

[0028] (1) First mix epoxy resin A glue (561A glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) with epoxy resin B glue (561B glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) to get epoxy resin AB glue , and then epoxy resin AB glue, Super-P and Al 2 o 3 Mix evenly to obtain the mixed material, add 60% absolute ethanol by weight of the mixed material, and mix thoroughly to make a slurry; epoxy resin A glue, epoxy resin B glue, Super-P and Al 2 o 3 The ratio is shown in Table 1, Al 2 o 3 The particle size is 1-3 microns;

[0029] (2) Evenly coat the slurry prepared in step (1) on the surface of aluminum foil (thickness 10 microns), and the coating thickness is 2 microns;

[0030] (3) LiFePO 4 The carbon film electrode rolled from the powder (the thickness of the carbon film electrode is 80 microns) is pressed with the aluminum foil coated with slurry on the surface obtained in step (2) (compression rate is 70%), and vacuum dried at 50°C to obtain a lithium-ion battery P...

Embodiment 2

[0032] (1) First mix epoxy resin A glue (561A glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) with epoxy resin B glue (561B glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) to get epoxy resin AB glue , and then epoxy resin AB glue, Super-P and Al 2 o 3 Mix evenly to obtain the mixed material, add 70% absolute ethanol by weight of the mixed material, and mix thoroughly to make a slurry; epoxy resin A glue, epoxy resin B glue, Super-P and Al 2 o 3 The ratio is shown in Table 1, Al 2 o 3 The particle size is 1-3 microns;

[0033](2) Evenly coat the slurry prepared in step (1) on the surface of aluminum foil (thickness 10 microns), and the coating thickness is 5 microns;

[0034] (3) LiFePO 4 The carbon film electrode rolled from the powder (the thickness of the carbon film electrode is 150 microns) is pressed with the aluminum foil coated with slurry on the surface obtained in step (2) (compression ratio is 70%), and vacuum-dried at 60°C to obtain a lithium-ion battery ...

Embodiment 3

[0036] (1) First mix epoxy resin A glue (561A glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) with epoxy resin B glue (561B glue, Shenzhen Xinlida Rubber Industry Co., Ltd.) to get epoxy resin AB glue , and then epoxy resin AB glue, Super-P and Al 2 o 3 Mix evenly to obtain the mixed material, add 65% absolute ethanol by weight of the mixed material, and mix thoroughly to make a slurry; epoxy resin A glue, epoxy resin B glue, Super-P and Al 2 o 3 The ratio is shown in Table 1, Al 2 o 3 The particle size is 1-3 microns;

[0037] (2) Evenly coat the slurry prepared in step (1) on the surface of aluminum foil (thickness 10 microns), and the coating thickness is 3 microns;

[0038] (3) LiFePO 4 The carbon film electrode rolled from the powder (the thickness of the carbon film electrode is 100 microns) is pressed with the aluminum foil coated with slurry on the surface obtained in step (2) (compression rate is 70%), and vacuum-dried at 55°C to obtain a lithium-ion battery ...