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A kind of flame retardant package and lithium ion battery thereof

A lithium-ion battery and packaging technology, applied in secondary batteries, battery pack components, battery boxes/jackets, etc., can solve problems such as battery thermal runaway and fire

Active Publication Date: 2020-10-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the encapsulated capsules containing phosphorus-based flame-retardant additives cannot eliminate the risk of battery thermal runaway before the battery thermal runaway, and can only delay the process of thermal runaway. Some test batteries containing phosphorus-based flame-retardant additive-encapsulated capsules still caught fire

Method used

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  • A kind of flame retardant package and lithium ion battery thereof
  • A kind of flame retardant package and lithium ion battery thereof
  • A kind of flame retardant package and lithium ion battery thereof

Examples

Experimental program
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preparation example Construction

[0047] The second aspect of the present disclosure provides a method for preparing a flame-retardant package, the method comprising the following steps:

[0048] S1. Fold a piece of outer film with at least part of the edge combined with a sealing film strip in half, then partially seal the corresponding edge, and reserve an unclosed seal at the same time to form a prefabricated film bag; or combine two pieces of at least part of the edge with a seal The outer films of the film strips are attached to each other, and then the corresponding edges are partially closed, while an unclosed seal is reserved to form a prefabricated film bag;

[0049] Wherein, the unsealed seal 3 is provided with a sealing film strip 2 in an unsealed state;

[0050] Part or all of the sealing film strip 2 in the unclosed state is only combined with one side inner surface of the unclosed seal 3, and not combined with the other side inner surface of the unclosed seal 3;

[0051] S2, filling the flame re...

Embodiment 1

[0067] (1) Preparation of packaging package:

[0068] A piece of rectangular polyethylene terephthalate film with a thickness of 50 μm and a tensile strength of 4000 MPa is used as the outer film, folded in half and hot-pressed to form a prefabricated film bag with a seal on one side; the inner side of the seal is preset with a thickness 30 μm and 8 mm in width, the sealing film strip is formed by bonding 2 / 3 length of polyethylene film with a softening temperature of 120°C and 1 / 3 length of a polyvinyl chloride film with a softening temperature of 100°C; After injecting 1.2 g of dimethyl methyl phosphate into the prefabricated film bag, the seal was sealed by heat welding to prepare the packaging package of this embodiment.

[0069] (2) Preparation of positive electrode sheet:

[0070] LiCoO 2 Mix evenly with acetylene black and polyvinylidene fluoride at a weight ratio of 85:10:5, add solvent to make positive electrode slurry, evenly coat on aluminum foil, dry and roll to ...

Embodiment 2

[0078] (1) Preparation of packaging package:

[0079] A piece of rectangular polyethylene terephthalate film with a thickness of 50 μm and a tensile strength of 4000 MPa is used as the outer layer film, folded in half and hot-pressed to form a prefabricated film bag with a seal on one side, and the inside of the seal is preset with a thickness The sealing film strip is 30 μm and the width is 8mm; the sealing film strip is formed by adhering 1 / 3 length of polyethylene film with a softening temperature of 120°C and 2 / 3 length of a polyvinyl chloride film with a softening temperature of 100°C; After injecting 1.2 g of dimethyl methyl phosphate into the prefabricated film bag, the seal was sealed by heat welding to prepare the packaging package of this embodiment.

[0080] (2) The preparation of the positive electrode sheet, the negative electrode sheet, the electrolyte and the battery assembly were the same as in Example 1, and the lithium ion battery containing the packaging pac...

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Abstract

The present disclosure provides a flame retardant packaging package, the packaging package includes a packaging package wall and a flame retardant material wrapped in the packaging package, the packaging package wall includes an outer film that has a seal and is insoluble in electrolyte and seals the A sealing film strip for sealing; the sealing comprises a first sealing section and a second sealing section, and the sealing film strip comprises a first sealing film strip section closing the first sealing section and a second sealing section closing the second sealing section The sealing film strip section, the package wall can maintain a stable structure at a temperature lower than 100°C, and can soften and rupture at a temperature of 100-170°C. The present disclosure also provides a preparation method of the flame retardant package and a lithium ion battery containing the flame retardant package. In the range of 100-170°C, the combination of sealing film strips with different softening temperatures makes the release of the flame retardant substance slow at low temperature and fast at high temperature, realizing the controllable release speed and temperature of the flame retardant substance.

Description

technical field [0001] The present disclosure relates to the technical field of batteries, and in particular, to a flame-retardant packaging package and a lithium-ion battery thereof. Background technique [0002] The application of lithium-ion batteries in the field of new energy vehicles is becoming more and more widespread. However, the reports of lithium-ion battery safety accidents have also increased significantly. Battery thermal runaway caused by overcharge and overdischarge, etc. CN201310486020.X discloses an encapsulation capsule containing phosphorus-based flame-retardant additives built into the battery. When thermal runaway occurs in a lithium-ion battery, the capsule wall of the encapsulation capsule ruptures so that the core material of the encapsulation capsule, namely the phosphorus-based flame-retardant Additives are released to achieve flame retardancy and improve the safety performance of lithium-ion batteries. [0003] However, the encapsulated capsule...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02H01M10/0525H01M10/42H01M50/10
CPCH01M10/0525H01M10/42H01M50/10Y02E60/10
Inventor 黄荣刚任建新王圣
Owner BYD CO LTD