Preface
Nowadays, the mobile power market can be described as a hundred schools of thought, a variety of choices, each manufacturer focuses on different directions, but the core of the mobile power supply is the built-in battery pack, which is not only the highest cost component of the whole product, but also the most critical and most vulnerable component. Multi-string lithium battery packs often cause inconsistent battery loss due to individual differences in factory capacity and various complex factors, which will affect the service life of the whole machine in the long run. Therefore, major mobile power brands often add battery balancing circuits to their products to avoid excessive loss of a single cell.
The application of battery balancing chip in mobile power supply
The charging head network has sorted out the recent mobile power supply with built-in battery equalization chip, and the models and some specifications are shown in the above table, and the chip details and application cases will be introduced to you in detail.
Preface
Chuangxin Micro CM1010-A
Chuangxin micro cell balancing chip CM1010-A chip integrates high-precision voltage detection circuit and delay circuit inside, which can control the conduction of external MOS tube and access resistance for equalization by detecting the battery voltage, so as to meet the application of multiple strings of lithium-ion battery packs. Chuangxin Micro CM1010-A balanced opening detection voltage is 4.2V, the accuracy is 25mV, the balance shutdown hysteresis voltage is 0.01V, the accuracy is 50mV, and the chip is SOT23-6 package.
Application examples
Romax 10000mAh 67W Super Fast Charging Power Bank
This power bank and charger two-in-one all-in-one charging power bank, this power bank has a built-in 10000mAh battery, with 1A1C output interface, in charger mode, USB-C interface supports 67W fast charging, USB-A interface supports 22.5W fast charging. When the dual ports are used at the same time, it supports 45W+18W automatic power distribution, which can charge mobile phones and laptops at the same time.
Related Reading:
Teardown report: Romax 10000mAh 67W super fast charging power bank
钰泰ETA3000
The ETA3000 is a lithium battery active balancing chip based on inductive energy transfer, the chip adopts Etek's independent patented technology, different from the traditional passive balancing technology, ETA3000 uses inductive energy storage, discharges from the battery with high voltage, and charges the battery with low voltage.
ETA3000 consumes only 2μA of standby current in standby mode, and the chip has high equalization voltage accuracy down to 30mV. It automatically detects the battery voltage that needs to be balanced, and supports automatic equalization when a certain error is reached, which is suitable for the use of multi-cell series battery packs. The balancing current supports flexible setting of resistor, and the maximum balancing current can reach 2A.
The chip supports balanced status indication, the switching frequency is 1MHz, supports the use of small volume inductors, and the chip supports battery overvoltage protection, undervoltage protection and overtemperature protection, which is suitable for multi-string battery systems, such as power banks, portable devices and battery backup systems. ETA3000 is available in SOT23-6 and DFN2*2-8 packages, with the DFN2×2-8 packages supporting enable control and equalization status indication.
Application examples
Romax 30000mAh power bank
This mobile power supply is made of PC fireproof plastic shell, gray + white color matching, and the surface is frosted and anti-fingerprint. The USB-C interface of the power bank has a 30W fast charging output, supports 20V output, supports charging laptops, and supports PPS fast charging, and the compatibility with Android phones is also good, and the two USB-A ports also support fast charging.
Related Reading:
Teardown report: Romax 30000mAh power bank
Samsung 10000mAh 25W fast charging power bank
This 10000mAh power bank P3400 from Samsung, this power bank case is made of recycled materials that have passed UL certification, reducing carbon emissions and protecting the environment. The shell is ergonomically designed with rounded edges for a comfortable grip. The power bank has two USB-C ports, which supports simultaneous charging of dual devices. The maximum input and output power of the power bank is 25W, which supports accelerated charging. It has 5V3A, 9V2.77A fixed voltage ranges and two sets of PPS voltage ranges of 3.3-5.9V3A and 3.3-11V2.75A, which have good fast charging compatibility for mainstream brand mobile phones.
Related Reading:
Teardown report: Samsung 10000mAh 25W fast charging power bank
Summary of the charging head network
The Chuangxin Micro and Yutai battery balancing chips mentioned in the article can monitor the working status of the battery in real time, realize the battery balancing function, prevent excessive loss of a single battery in the mobile power supply, improve the overall life of the battery string, and improve the overall reliability of the product. In addition, these chips can be applied not only in mobile power supplies, but also in devices with built-in multiple strings of lithium batteries such as UPS, vacuum cleaners, and power tools.