GB/T 33143-2022 PDF in English
GB/T 33143-2022 (GB/T33143-2022, GBT 33143-2022, GBT33143-2022)
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Aluminium and aluminium alloy foils for lithium ion batteries
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| GB/T 33143-2016 | English | 150 |
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Aluminium and aluminium alloy foil for lithium ion batteries
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Standards related to (historical): GB/T 33143-2022
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GB/T 33143-2022: PDF in English (GBT 33143-2022) GB/T 33143-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Replacing GB/T 33143-2016
Aluminum and Aluminum Alloy Foils for Lithium-Ion Batteries
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Classification ... 6
5 Technical Requirements ... 7
6 Test Methods ... 15
7 Product Qualification ... 17
8 Process Control ... 17
9 Inspection Rules ... 18
10 Marking, Packaging, Transportation, Storage and Quality Certificate ... 21
11 Contents of Order Form (or Contract) ... 22
Appendix A (Informative) Online Test Methods of Pinhole and Hole ... 23
Appendix B (Informative) Online Detection of Surface Defects ... 26
Appendix C (Informative) Product Qualification ... 29
Appendix D (Informative) Process Control ... 33
Bibliography ... 38
Aluminum and Aluminum Alloy Foils for Lithium-Ion Batteries
1 Scope
This Document specifies the classification, technical requirements, test methods, product
qualification, process control, inspection rules and marking, packaging, transportation, storage
and quality certificates, as well as purchase orders (or contracts) of aluminum and aluminum
alloy foils for lithium-ion batteries.
This Document applies to aluminum and aluminum alloy foils (hereinafter referred to as
"aluminum foils") for lithium-ion battery current collectors.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 3190 Wrought Aluminum and Aluminum Alloys - Chemical Composition Limits
GB/T 3199 Wrought Aluminum and Aluminum Alloy Products - Packing, Marking,
Transporting and Storing
GB/T 7999 Optical Emission Spectrometric Analysis Method of Aluminum And
Aluminum Alloys
GB/T 8005.1 Aluminum and Aluminum Alloys - Terms and Definitions - Part 1: Product
and Method of Processing and Treatment
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of
Limiting Values
GB/T 16865 Test Pieces for Tensile Test for Wrought Aluminum and Magnesium Alloy
Products
GB/T 17432 Methods of Sampling for Analyzing the Chemical Composition of Wrought
Aluminum and Aluminum Alloy
GB/T 20975 (all parts) Methods for Chemical Analysis of Aluminum and Aluminum
Alloys
5.8.1.4 The coating of the coating foil shall be uniform, and the coating area shall not be allowed
to expose the substrate.
5.8.2 End face
The end face of the aluminum foil is not allowed to have arrows, stains, bumps and other defects,
and dense aluminum powder with visible reflected light is not allowed.
6 Test Methods
6.1 Chemical composition
6.1.1 The chemical composition analysis method of the light foil and coating foil substrate shall
comply with the provisions of GB/T 20975 or GB/T 7999; and the arbitration analysis shall
adopt the method stipulated in GB/T 20975. The "Al" content is calculated according to the
method specified in GB/T 3190. When calculating the "Al" content, the sum of the analytical
values of the conventional analytical elements and the unconventional analytical elements
suspected to be excessive is taken as the "sum of element content".
6.1.2 The determination of the analysis value shall adopt the rounding-off comparison method;
the rounding-off rules of the numerical value shall be carried out according to the relevant
provisions of GB/T 8170; and the rounding-off digits shall be consistent with the limit digits
specified in Table 2 or GB/T 3190.
6.1.3 The chemical composition analysis method for the coating of the coating foil shall be
determined through negotiation between the supplier and the purchaser.
6.2 Dimensional deviation
6.2.1 Dimension rounding-off
Dimensional measurements are not allowed to be rounded-off; and the method for determining
the limit value shall comply with the provisions of GB/T 8170.
6.2.2 Thickness
The thickness of the light foil and the coating foil substrate shall be determined according to
the method specified in GB/T 22638.1. When the purchaser requires the selection of non-
standard area samples to measure the thickness, it shall be indicated in the order form (or
contract). The measurement method of the thickness extreme difference shall be determined
through negotiation between the supplier and the purchaser.
6.2.3 Areal Density
6.2.3.1 The areal density of the light foil and the coating foil substrate shall be determined
according to the method specified in GB/T 22638.10. When the purchaser requires the selection
of non-standard area samples to measure the surface density, it shall be indicated in the order
form (or contract). The measurement method of areal density extreme difference shall be
determined through negotiation between the supplier and the purchaser.
6.2.3.2 The areal density for the coating of the coating foil shall be determined according to the
method specified in GB/T 22638.10, or determined through negotiation between the supplier
and the purchaser.
6.2.4 Width
Measure with a film ruler or other tool of corresponding accuracy.
6.2.5 Length
Measure with tools of corresponding accuracy.
6.2.6 Burrs, cracked edges
Select the trimming positions on both sides of the aluminum foil roll, and cut the sample
including the trimming edge of the aluminum foil along the trimming edge, and the length of
the sample shall be greater than 30cm. Under a microscope (optical magnification should be no
less than 100×, digital magnification should be no less than 500×), visually check the
smoothness of the edge of the sample, crack defects and measure the burr size. It should observe
the edge of the aluminum foil from multiple angles.
6.2.7 Plate shape
6.2.7.1 Under the unit tension of 8N/mm2, visually inspect the aluminum foil for poor plate
shape defects.
6.2.7.2 Under the unit tension of 8N/mm2, the wave height of the aluminum foil wave is
measured by the off-line plate shape testing device.
6.2.8 Staggered layer
Measure by tools of corresponding precision.
6.3 Tensile mechanical properties at room temperature
The tensile mechanical properties at room temperature shall be tested according to the method
specified in GB/T 16865. The test gauge length is 50mm or 100mm; and the test rate is
5mm/min or 10mm/min, which is determined by the negotiation between the supplier and the
purchaser.
6.4 Pinhole
The pinhole offline test is carried out according to the method specified in GB/T 22638.2; and
the pinhole online test method is shown in Appendix A.
6.5 Surface wetting tension
It shall be tested according to the method specified in GB/T 22638.4.
6.6 Joints
Visual inspection.
6.7 Tube core
The dimension deviation of the tube core is measured by a measuring tool that can guarantee
the accuracy; the material of the tube core is guaranteed by the supplier; and other items are
checked visually.
6.8 Appearance quality
6.8.1 Surface
6.8.1.1 During the arbitration inspection, visually inspect the appearance quality under natural
scattered light.
6.8.1.2 The diameter of the circumscribed circle of point defects on the surface of the aluminum
foil can be measured by a measuring tool with corresponding accuracy.
6.8.1.3 See Appendix A for the online detection method of holes on the surface of aluminum
foil. See Appendix B for on-line detection methods for other surface defects.
6.8.2 End face
Visually inspect the end face quality in a bright environment.
7 Product Qualification
When required by the purchaser, the product qualification of the light foil can be carried out
with reference to the provisions of Appendix C.
8 Process Control
The supplier shall control the production process of the product, and the process control shall
refer to the provisions of Appendix D.
9.6.8 When the appearance quality of any product is unqualified, the product shall be judged as
unqualified.
10 Marking, Packaging, Transportation, Storage and Quality
Certificate
10.1 Marking
10.1.1 Product marking
Markings (or labels) shall be made on each roll of products that have passed the inspection, and
the contents of the marking are as follows:
a) product name;
b) use code;
c) designation;
d) state;
e) size and specification;
f) batch number or roll number (in order to achieve roll number traceability, barcode format
should be used);
g) net weight;
h) The signature (or seal) of the inspection seal or quality inspector of the supplier's technical
supervision department.
10.1.2 Marking of packaging box
The marking of packaging box of the product shall comply with the provisions of GB/T 3199.
In order to achieve the traceability of the box number, the barcode should be used.
10.2 Packaging, transportation and storage
The packaging, transportation and storage of the product shall comply with the provisions of
GB/T 3199.
10.3 Quality certificate
Each batch of aluminum foil shall be accompanied by a product quality certificate, which states:
a) the name of the supplier;
b) product name;
c) use code;
d) grade and status;
e) size and specification;
f) net weight;
g) batch number (or roll number);
h) The inspection results of each analysis item;
i) the document number;
j) the seal of the supplier's technical supervision department;
k) Packaging date (or exit-factory date).
11 Contents of Order Form (or Contract)
An order form (or contract) for the products listed in this Document shall include the following:
a) product name;
b) category (light foil, coating foil or single-sided light foil, double-sided light foil);
c) designation and state;
d) size and specification;
e) weight;
f) tube core material and specifications;
g) Items (thickness/areal density/width/length deviation level, edge burr level, edge crack
requirements, wave height level, special requirements for tensile mechanics performance
at room temperature, pinhole level, etc.) "that should be indicated in the order form (or
contract)" required by this Document;
h) Negotiation results when adding content other than this Document;
i) This Document No.
Appendix B
(Informative)
Online Detection of Surface Defects
B.1 Principle of method
The camera is used to take pictures of the surface of the inspected aluminum foil; and it is
compared and analyzed with the surface defect library stored in the system; so as to detect the
type, area and distribution of surface defects that affect the use or have the risk of being
complained in real time.
B.2 Test conditions
B.2.1 Ambient temperature: 0℃~50℃.
B.2.2 Slitting speed: ≤600m/min.
B.3 Equipment
The surface defect online detector is mainly composed of a host, a camera, and a light source.
The camera configuration can cover the entire width of the aluminum foil. The horizontal
accuracy is 0.09mm, and the longitudinal accuracy is 0.15mm.
B.4 Specimen
Foil roll.
B.5 Determination
B.5.1 Arrange the testing equipment according to the operating procedures.
B.5.2 Enter the following information in the surface defect online detector, such as roll number,
use code, designation, state, width, etc.
B.5.3 After the beginning of the slitting, start the online surface defect detector and start online
detection. During the detection process, confirm that the connection between each camera board
and the serial port is normal.
B.5.4 After the end of the slitting, turn off the surface defect online detector.
B.6 Representation of result
B.6.1 Evaluate the defect level according to Table B.1.
F – the purchaser confirms the process verification results;
G – the supplier conducts the material qualification (two furnaces and six batches);
H – whether the assessment results is qualified;
I – whether it is because the unqualified production process cause;
J – the purchaser approves the supply qualification of the supplier;
K –formal verification stage of process stability;
L – the supplier’s small batches of supply (within 50 batches);
M – the purchaser conducts the assessment on the performance stability and process capability
of small batches of products;
N –production and supply in batches stage.
Figure C.1 – Product Qualification Flow Chart
C.2 Product qualification requirements
C.2.1 Process research stage
Before formally launching the full-specification range and full-item supply capability
verification of the product, select some thickness specifications, carry out process development,
and verify the rationality of the process according to standards or customer requirements. In
this way, it is verified whether the supplier has the ability to carry out the production in the full-
specification range of products. When the supplier has experience in the production and supply
of aluminum and aluminum alloy foils for lithium batteries, the supplier and the purchaser can
negotiate and directly enter the next stage.
C.2.2 Formal verification stage of process stability
C.2.2.1 Process stability assessment
C.2.2.1.1 According to the requirements of the purchaser, the supplier shall produce products
with no less than 2 smelting furnaces and 6 production batches (hereinafter referred to as two
furnaces and six batches) according to the determined process; and the supplier shall submit the
test report (customer-certified laboratory or testing capability) until the test results all meet the
requirements.
C.2.2.1.2 If any batch is unqualified in continuous production, the previous qualified batches
shall be checked. At the same time, the supplier analyzes and finds the reasons for the failure;
re-determines the production trial production process; and organizes the production verification
and performance assessment of two furnaces and six batches again.
C.2.2.1.3 After the aluminum foil production inspection is completed, the supplier shall form a
complete set of process documents, original production records, original test reports, stability
analysis reports, summary reports in the development stage, and process rationality
explanations and archive them. If required by the purchaser, they shall be provided by the
supplier.
C.2.2.2 Material qualification stage
C.2.2.2.1 After the supplier determines the process, it shall carry out the production of 2
smelting furnaces and 2 production batches according to the determined production process;
carry out the material qualification identification; and submit it to the laboratory approved by
the purchaser for testing until all the test results meet the requirements.
C.2.2.2.2 If any batch is unqualified in continuous production, this stage shall not pass, the
supplier shall analyze and find the reason for the disqualification; and report to the purchaser
in writing. If it is caused by production process, the supplier shall re-conduct the process
research; if it is not caused by production process, the supplier shall reorganize the qualification
appraisal.
C.2.2.2.3 On the premise of the corresponding confidentiality clauses, the representatives of
the relevant departments of the purchaser have the right to witness and investigate the various
processes of the supply capability verification.
C.2.2.2.4 A material qualification report is formed through the material at the material
qualification stage; and the report contains the following information: project name,
manufacturer's name and address, relevant product production and supply experience, standard
number, alloy, state, product dimension, casting batches, heat treatment batches, inspection
items and inspection results, original inspection reports, process route descriptions, tooling
equipment descriptions, quality certificates, etc.
C.2.3 Production and supply in batches stage
C.2.3.1 After the supplier obtains the supply qualification approved by the purchaser, it shall
supply in small batches.
C.2.3.2 After the supply of small batches, the purchaser shall analyze and assess the supply
data of small batches. After confirming that the performance and performance stability all meet
the requirements of the purchaser, mass production can be carried out.
C.2.3.3 The supplier shall monitor the production process, equipment, etc. according to the
requirements of the process control documents during the product batch production process;
and regularly conduct relevant tests on the equipment; and conduct stability analysis of the
production process parameters to ensure the stability of product performance .
Appendix D
(Informative)
Process Control
D.1 Procedure developed from process control document
After the supplier has the ability to produce qualified products according to the requirements
of this Document, it shall carry out the necessary material certification. Before the material
certification, the supplier shall prepare a process control document in accordance with the
production control requirements specified in this Document. In order to ensure the stability of
material quality, and the production or production-related requirements of this product are
specified in the process control document. The procedure developed from the process control
document is as follows:
a) The supplier produces the specified batches of products that meet the requirements of this
Document according to the user's needs;
b) The supplier has a quality system certified by a third party;
c) The supplier formulates process control documents according to the content specified in
this Document;
d) Both the supplier and the purchaser confirm the process control document, which shall
be implemented after the confirmation takes effect.
D.2 Range and requirements of the process control
D.2.1 Range of process control
In order to ensure the effectiveness of material process control, the process control document
includes the following:
a) raw material requirements;
b) process requirements;
c) equipment requirements.
D.2.2 Raw material requirements
D.2.2.1 Raw material process control includes supplier qualification confirmation and raw
material quality control.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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