On May 31, the State Administration for Market Regulation issued an official announcement: a new national standard, Safety Technical Specifications for Mobile Power Banks, has been incorporated into China Compulsory Certification (CCC). Full compliance will be mandatory starting April 1, 2027, with a 12-month transition period. All mobile power bank solutions currently under development or prepared for certification testing must be adjusted in accordance with the new standard without delay.

Most analyses focus on how stringent the new regulations are. This article clarifies the core revisions and corresponding component selection adjustments for the bill of materials (BOM).

New Mandatory Technical Requirements

Below are key changes closely related to component selection:

1. New Nail Penetration Test A fully charged cell must withstand penetration by a 4mm steel needle, with no fire or explosion within 5 minutes. This test item was not specified in the old standard.
2. Upgraded High Temperature Resistance Test The requirement is raised from maintaining 130°C for 30 minutes to 135°C for 60 minutes. Higher temperature and longer duration cover the scenario of power banks exposed to direct sunlight inside vehicles in summer.
3. Stricter Compression Resistance Test The original flat compression of 13 kilonewtons is replaced with 20 kilonewtons rod compression. Greater force, smaller contact area and more concentrated local stress bring higher test difficulty.
4. New Lithium Plating Inspection after Cycling Aging After 300 charge-discharge cycles, no lithium metal precipitation is allowed inside the cell. This requires the protection circuit to guarantee safety margin even when the battery ages, beyond normal operating conditions.
5. New Intelligent Management Requirements Products must be equipped with overcharge, overdischarge, overcurrent, short-circuit protection and temperature monitoring. Quantitative thresholds and response time are defined for all protection functions. Another easily overlooked clause: products shall support abnormal data storage and reading. In other words, the protection circuit is required to record faults instead of merely cutting off the circuit.
6. Additional Independent Protection Circuit Besides the original protection design, an extra standalone protection layer is mandated, which means more protection components will be needed in the BOM.

Component Selection Adjustments Item by Item

1. Charge & Discharge Switch MOSFETs: Adapt to Stricter Overcharge Tests

Under the new rules, the overcharge test requires constant-current charging at 0.2C until the voltage reaches 1.3 times the rated charging limit. The charge-discharge switch MOSFET is responsible for cutting off the circuit in case of overcharge. Two key factors shall be considered for selection:

First, on-resistance. The full load current flows through the switch. Lower on-resistance means less power loss and heat generation. Under the 135°C high-temperature test condition, extra heat from the device itself may cause deviation of protection trigger points.

Second, consistency of threshold voltage. Discrepancies in threshold voltage among MOSFETs will lead to inconsistent turn-off response speed. Devices with inconsistent parameters may fail to cut off the circuit timely during overcharge tests.

Hekotai offers qualified solutions for medium and low voltage switch devices:

• SOT-23 packaged AO3400 and SI2302: Ideal for low-current load switches. Hekotai provides fully compatible alternatives.
• PDFN5×6 packaged HKTD series: Applied to main charge-discharge circuits, with on-resistance down to milliohm level.

2. TVS Diodes: Enhanced Port Reverse Connection Protection

The new standard explicitly strengthens protection against incorrect port insertion. The Type-C input port may face risks such as reverse connection and voltage mismatch, where TVS diodes act as the primary protection barrier.

Selection Guidelines: The rated working voltage of the TVS must cover the maximum operating voltage of the port, and its clamping voltage shall be lower than the withstand voltage of post-stage components. Taking 20V PD fast charging ports as an example, TVS with a minimum working voltage of 24V is recommended:

• SMF24CA (SOD-123FL): Working voltage 24V, clamping voltage 38.9V, peak pulse power 200W
• SMAJ24CA (SMA): Peak pulse power 400W (sufficient for most PD ports)
• SMBJ24CA (SMBJ): Peak pulse power 600W (larger safety margin for reserved space)

Note a critical parameter: junction capacitance. Excessively high capacitance of TVS on Type-C high-speed signal lines will degrade signal quality. This parameter can only be checked in official datasheets rather than general selection tables.

3. Li-ion Battery Protection ICs: Doubled Demand for Dual-layer Protection

The extra independent protection layer means traditional single-IC solutions are no longer applicable. Designers need to adopt two separate ICs or dedicated dual-channel protection chips.

HKT4059E from Hekotai is a single-cell lithium battery charge management IC with comprehensive charging protection functions. Under the new standard, it is advised to build a dual-layer architecture: charge management IC + independent overcharge/overdischarge protection IC.

In addition, the abnormal data storage & reading function cannot be realized by conventional protection ICs alone. A matching MCU is required: the protection IC executes detection and circuit cut-off, while the MCU records fault information.

4. Rectifier Bridges & Schottky Diodes: Input Rectification & Reverse Polarity Protection

Rectifier bridges or Schottky diodes are essential for polarity protection and rectification at the charging input terminal. With stricter port protection requirements, input devices must resist breakdown under reverse voltage.

Hekotai’s ABS/GBP/GBU series rectifier bridges and SS/SK series Schottky diodes fully meet the input rectification demands of mobile power banks.

Timeline & Action Plan

CCC application opens in July 2026, and mandatory enforcement takes effect on April 1, 2027. The certification process takes 6 to 10 weeks excluding revision work. The schedule is arranged as follows:

• June – August 2026: Adjust BOM component selection and complete solution verification per the new standard
• September – November 2026: Arrange type tests and reserve time for revision
• December 2026 – February 2027: Complete factory inspection and obtain CCC certificates
• March 2027: Final month of the transition period

The schedule is tight. PCB revision alone takes 2 to 3 weeks per iteration. Confirm component selection as early as possible to avoid repeated modifications.

Summary

Compliance with the new mobile power bank standard requires more than just cell replacement. Adjustments are needed for protection circuits, switch MOSFETs, TVS diodes and protection ICs. The core points are as follows:

1. Re-evaluate heat generation and threshold voltage consistency of switch MOSFETs due to stricter overcharge and high-temperature tests;
2. Optimize TVS selection to meet upgraded port anti-misconnection requirements;
3. Prepare for doubled demand of protection ICs to realize dual-layer protection.

If you are developing mobile power bank solutions, please check the above components in your BOM first. Hekotai provides a full range of matching switch MOSFETs, TVS diodes, protection ICs, rectifier bridges and Schottky diodes. Feel free to contact our team for selection support and official datasheets.