Detailed Analysis on New Internal Analysis
Detailed Analysis on New Internal Analysis,
Internal Analysis,
▍Certification Overview
Standards and Certification Document
Test standard: GB31241-2014: Lithium ion cells and batteries used in portable electronic equipment―Safety requirements
Certification document: CQC11-464112-2015: Secondary Battery and Battery Pack Safety Certification Rules for Portable Electronic Devices
Background and Date of implementation
1. GB31241-2014 was published on December 5th, 2014;
2. GB31241-2014 was mandatorily implemented on August 1st, 2015. ;
3. On October 15th, 2015, Certification and Accreditation Administration issued a technical resolution on additional testing standard GB31241 for key component “battery” of the audio and video equipment, information technology equipment and telecom terminal equipment. The resolution stipulates that the lithium batteries used in the above products need to be randomly tested as per GB31241-2014, or obtain a separate certification.
Note: GB 31241-2014 is a national compulsory standard. All the lithium battery products sold in China shall conform to GB31241 standard. This standard will be used in new sampling schemes for national, provincial and local random inspection.
▍Scope of Certification
GB31241-2014 Lithium ion cells and batteries used in portable electronic equipment―Safety requirements
Certification documents is mainly for mobile electronic products that are scheduled to be less than 18kg and can be often carried by users. The main examples are as follows. The portable electronic products listed below do not include all products, so products not listed are not necessarily outside the scope of this standard.
Wearable equipment: Lithium-ion batteries and battery packs used in equipment need to meet standard requirements.
|
Electronic product category |
Detailed examples of various types of electronic products |
|
Portable office products |
notebook, pda, etc. |
| Mobile communications products | mobile phone, cordless phone, Bluetooth headset, walkie-talkie, etc. |
| Portable audio and video products | portable television set, portable player, camera, video camera, etc. |
| Other portable products | electronic navigator, digital photo frame, game consoles, e-books, etc. |
▍Why MCM?
● Qualification recognition: MCM is a CQC accredited contract laboratory and a CESI accredited laboratory. The test report issued can be directly applied for CQC or CESI certificate;
● Technical support: MCM has ample GB31241 testing equipment and is equipped with more than 10 professional technicians to conduct in-depth research on testing technology, certification, factory audit and other processes, which can provide more accurate and customized GB 31241 certification services for global clients.
The new version mentions a new forced internal shorting test. The new method is to stimulate internal shorting by penetrating to create positive and negative tabs in layer 1 and 2 shorting. The procedure is as followed:
1. Cell preparing: Drill a hole in the center of the largest face (as figures below) or reserve a hole when manufacturing for venting.
2. Fixation of the cell: After fully charged, fix the cell in the testing tools. The cell shall be electrically isolated from the test bench. The cell and indenter shall move along the perpendicular axis. The indentation position shall be the same as described in forced internal shorting.
3. Connecting the monitoring line: The temperature monitoring line on cell surface, the voltage of the cell, the voltage of cell negative terminal and the intender (the voltage shall be recorded with sample rate of at least 1000Hz);
4. Press the intender to the cell with a constant velocity of 0.01mm/s. The press speed may be faster than 0.01mm/s if a one or two-layer internal short circuit can be achieved. The press should be stopped when a visible abrupt voltage drop is detected, and the intender should be released from the cell and release the press.
