Preface
Lithium batteries have the advantages of high voltage, high energy density, long cycle life, etc., and at the same time, there is no memory effect and heavy metal pollution of nickel-cadmium and nickel-manganese batteries in the past, so lithium batteries can be seen in various scenarios that require energy storage such as mobile phones, mobile power supplies, outdoor power supplies, and new energy vehicles.
However, for lithium batteries, overcharge, overdischarge, overvoltage, overcurrent and other conditions will lead to battery abnormalities and affect the service life of the battery. In particular, the large-capacity, high-power fast-charging mobile power bank with built-in multi-string and multi-cell is prone to excessive loss of a single battery, which may eventually affect the performance of the product and even lead to the overall damage of the battery pack. To this end, major mobile power supply manufacturers will add lithium battery protection circuits to their products to deal with various abnormal situations.
The battery protection IC that appears in this article
The charging head network has sorted out a number of application cases of integrated balancing function battery protection ICs to help readers and friends understand the actual application of related chips. In addition, some of the parameters of a variety of battery protection ICs that appear in the article are shown in the figure, and the detailed information will be explained in detail for you below.
创芯微CM1341-DAT
Chuangxin CM1341-DAT is a protection chip dedicated to 4 strings of lithium-ion/lithium iron phosphate batteries, with built-in high-precision voltage detection circuit and current detection circuit. By detecting the voltage, charge and discharge current and temperature and other information of each battery, the functions of battery overcharge, over-discharge, equalization, disconnection, low-voltage prohibition, discharge overcurrent, short circuit, charging overcurrent and over-temperature protection are realized.
Chuangxin Micro CM1341-DAT has 15mV battery overcharge protection accuracy, supports three-stage discharge over-current protection, supports charging over-current protection function, supports battery cell wiring disconnection protection and NTC thermistor disconnection protection function, can provide perfect protection function for multiple strings of lithium battery packs, and adopts TSSOP-16 package.
Application examples
CUKTE酷态科10号超级电能棒
The Coolstate 10 Super Power Bar has a built-in 10,000mAh battery pack with a total output of 150W. The body of the power bank is a long cylindrical design, and is sprayed with silver-gray metallic paint, which is beautiful and stylish. This power bank has a 1A1C port, of which the USB-C port supports 90W charging power and 120W output power. The USB-A port supports 33W fast charging. The LCD screen supports the display of power bank parameters, and understands the power supply and load power supply information of the power bank in real time.
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Teardown report: CUKTECH Cool State Branch No. 10 Super Power Bar
Chuangxin Micro CM1351
Chuangxin CM1351 is a protection chip dedicated to 5 strings of lithium-ion/lithium iron phosphate batteries, with built-in high-precision voltage detection circuit and current detection circuit. By detecting the voltage, charge and discharge current and temperature and other information of each battery, the functions of battery overcharge, over-discharge, equalization, disconnection, low-voltage prohibition, discharge overcurrent, short circuit, charging overcurrent and over-temperature protection are realized.
Chuangxin CM1351 battery protection chip has a built-in battery balancing function, which can still achieve cell balancing through the internal equalization circuit of the chip and ensure the consistency of the battery when the external resistor and MOS tube are not used, and the TSSOP-16 package is adopted.
Application examples
CUKTECH 20号超级电能柱P23
CUKTECH No. 20 Super Power Column has a built-in 25000mAh large-capacity battery pack, with a total output power of 210W and a maximum output power of 140W for a single port, which supports powering three devices at the same time. The power bank is equipped with a 2C1A interface, the USB-C port supports 140W and 60W fast charging, and the USB-A port supports 30W fast charging. The fuselage is equipped with a screen and a light strip, which can display the status of the power bank, which is convenient to check the charging status, which increases the selling point of the product.
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拆解报告:Cooktech 20号超级电能柱P23
Jewalt JW3312
JW3312 is a protection chip that supports 3-5 strings of lithium batteries, with integrated high-precision voltage detection circuit, supporting overcharge, overdischarge, overcurrent, overheating and battery disconnection protection. JW3312 supports lithium batteries and lithium iron phosphate batteries, with 25mV overcharge voltage detection accuracy, 50mV over-discharge detection accuracy, built-in battery balancing function, and 3μA standby power consumption. The JW3312 is available in a TSSOP-20 package and is suitable for rechargeable lithium battery packs, power tools and UPS backup battery packs.
Application examples
Momis 15000mAh 65W 2-in-1 power bank
Momis supports 65W output power with its own wire, and the built-in gallium nitride charger also supports 65W output power, which can not only be used as a charger, but also provide the same experience as the charger in the state of the power bank. And this power bank comes with a wired design, which is easy to connect to a laptop for charging at any time, which is very convenient to use and brings users a different experience.
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Teardown report: Momis 15000mAh 65W 2-in-1 power bank
Saiwei Microelectronics CW1073
Saiwei Microelectronics CW1073 is a lithium battery protection chip with built-in high-precision detection circuit and delay circuit, which is suitable for 6-7 strings of lithium-ion batteries or lithium polymer battery packs. It provides protection functions such as overcharge detection, over-discharge detection, over-current detection, equalization, disconnection detection, and high and low temperature of charge and discharge for lithium battery packs, and adopts SSOP-24 package.
Application examples
Murray 30000mAh 100W four-port fast charging power bank
This power bank has a built-in 30,000mAh ultra-large capacity battery and supports 100W power, which can meet the long-term power supply needs of laptops. The USB-A port also supports fast charging output, which also has good charging compatibility with traditional devices. And it supports the display of battery percentage, which is more accurate for the display of remaining power.
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Saiwei Micro CW1244
Saiwei Microelectronics CW1244 is a 3-4 string lithium battery protection IC, which supports a variety of lithium battery protection such as lithium iron phosphate and high-voltage platform, supports battery balancing, and supports high-precision over-charge, over-discharge, and over-current protection. The CW1244 also supports battery temperature protection, disconnection protection and other functions, and is available in SSOP-16 and QFN-16 packages.
Application examples
CUKTECH 40000mAh 300W P+Series充电宝
This power bank launched by CUKTECH has a square shape and a side design display, which can display the battery level and input and output power. The power bank has a built-in 40000mAh large-capacity battery, with 2A2C interface, USB-C interface supports 140W and 100W two-way fast charging respectively, USB-A port supports 120W and 22.5W Xiaomi private fast charging, and there is a wireless charging area at the top. With a total output power of 300W MAX, it is capable of charging mobile phones and laptops at the same time, making it an all-rounder.
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Romax 20000mAh 100W Fast Charging Power Bank Sense6 Max
This 20,000mAh power bank has a 2C2A port, and two USB-C ports support 65W fast charging input and 100W fast charging output. And the 188 digital tube power display is used to accurately display the battery percentage, and the remaining power of the mobile power supply is more intuitive. There are also touch buttons on the side for a better user experience.
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Teardown report: Romax 20000mAh 100W fast charging power bank Sense6 Max
Zhongying SH366006
Zhongying SH366006 is a 2-4 string lithium battery protection chip, built-in FusionGauge algorithm, which can accurately measure the power information of lithium batteries, and has SMBus interface, supports battery balancing function, and adopts TSSOP-38 and QFN-40 two package forms.
Application examples
Haycide 20000mAh 155W可视移动电源
Haycide's power bank has a 2C1A output port and supports 100W bidirectional fast charging. The color LCD screen can intuitively understand the input and output voltage, current and power, battery power percentage, temperature and other information. The mobile power supply adopts an aluminum alloy skeleton with a plastic shell, which is fixed by screws, which is sturdy and has good heat dissipation capacity.
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Zhongying SH367306
Zhongying SH367306 is a 6-10 string lithium battery protection chip, the chip integrates hardware overcharge protection, integrated hardware discharge short circuit protection, internal integrated balancing function and load detection function, integrated charge and discharge status detection and small current wake-up, and integrated watchdog, Reset and Alarm functions, using QFN-28 package.
Application examples
Greenlink 48000mAh 300W high-power fast-charging power bank
This high-power fast-charging power bank has a built-in 48000mAh lithium iron phosphate battery pack, with a total output power of 300W, of which the USB-C1 interface supports 140W PD3.1 two-way fast charging, and the USB-C2 and USB-C3 interfaces support 100W fast charging, and the three interfaces support 100W fast charging output when used at the same time. There is an LED screen on the front of the power bank, which supports battery display, input and output power display, which is convenient to know the use status of the power bank.
Related Reading:
Teardown report: Greenlink 48000mAh 300W high-power fast-charging power bank
Summary of the charging head network
In the current mobile power market, with the popularization of high-power and high-capacity mobile power supplies, battery protection ICs with integrated balancing functions are becoming the key internal protection components. These chips can protect lithium batteries from abnormal conditions such as overcharge, overdischarge, and overcurrent. In addition, the power balance of each battery inside the battery pack is one of the key factors to ensure the efficiency of the whole system, and the built-in balancing function of these chips can automatically adjust the power distribution between each battery, avoiding the energy waste and performance degradation caused by the imbalance between the batteries, ensuring the output stability and durability of the power supply, and bringing users a safer, more stable and efficient experience.