GB/T 36363-2018 in English

《GB/T 36363-2018锂离子电池用聚烯烃隔膜》由TC77（全国碱性蓄电池标准化技术委员会）归口，主管部门为工业和信息化部（电子）。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is developed in accordance with the rules given in GB/T 1.1-2009.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.

This standard is under the jurisdiction of National Technical Committee on Alkaline Storage Battery of Standardization Administration of China (SAC/TC 77).


Polyolefin separator for lithium-ion battery

1 Scope

This standard specifies the terms and definitions, classification, requirements, test methods, inspection rules, packaging, marking, transportation and storage of polyolefin separator for lithium-ion battery (hereinafter referred to as separator).

This standard is applicable to separator for lithium-ion battery mainly made of polyolefin resin.

This standard serves as reference for the polyolefin separator coated on lithium-ion battery or the separators for lithium-ion batteries made of other materials.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 1040.3-2006 Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing
GB/T 6672-2001 Plastics film and sheeting - Determination of thickness by mechanical scanning
GB/T 6673-2001 Determination of length and width of plastics film and sheeting
GB/T 13542.2-2009 Film for electrical insulation - Part 2: Methods of test

3 Terms and definitions

For the purposes of this standard, the following terms and definitions apply.

3.1
mean deviation
the deviation of the mean value from the nominal value

3.2
air permeability
the time required for 100mL air to pass through the separator with an area of 6.45cm2 with the test instrument under a pressure of 1.21kPa in the environment of test temperature and humidity and atmospheric pressure

3.3
porosity
the percentage of the volume of the internal pores to the total volume of the separator

3.4
raw material density
the true density of the raw material constituting the separator

4 Classification

Separators are classified into three categories based on the production process: dry unidirectionally stretched separator, dry bidirectionally stretched separator and wet bidirectionally stretched separator.

5 Requirements

5.1 Appearance

5.1.1 Separator appearance

The separator appearance shall meet the requirements of Table 1.

Table 1 Separator appearance
Item Requirement
Undispersed raw material particle and wrinkle In conformance with specific code or order document
Foreign matter particle and mechanical damage Invisible in visual inspection
Needle hole Invisible in 10X magnification test

5.1.2 Roller appearance

The roller appearance shall meet the requirements of Table 2.

Table 2 Roller appearance
Item Requirement
End winding unevenness ≤0.5mm; free of visible burrs in visual inspection
Edge warping Invisible in visual inspection

5.2 Dimensions

5.2.1 Thickness deviation

The thickness deviation of separator shall meet the requirements of Table 3.

Table 3 Thickness deviation
Thickness specification, μm d0≤16 1625
Mean deviation, μm -1.0≤Δ ≤1.0
-1.5≤Δ ≤1.5
-2.0≤Δ ≤2.0

Upper deviation, μm ≤2.0 ≤2.5 ≤3.0
Lower deviation, μm ≥-2.0 ≥-2.5 ≥-3.0

5.2.2 Width deviation

The width deviation of separator shall meet the requirements of Table 4.

Table 4 Width deviation
Width specification
mm b0<100 100≤b0<200 b0≥200
Upper deviation
mm ≤0.5 ≤1 ≤2
Lower deviation
mm ≥0 ≥0 ≥0

5.2.3 Curvature

The curvature of separator shall meet the requirements of Table 5.

Table 5 Curvature
Item Requirement
Curvature ≤4mm/m

5.3 Physical properties

The physical properties of separator shall meet the requirements of Table 6.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Test methods
7 Inspection rules
8 Packaging, marking, transportation and storage