1. Importance of lithium battery protection PCBA
Lithium battery is widely used in mpn because of its small size, high energy density, no memory effect, long cycle life, high voltage battery and low self-discharge rate. Compared with Ni-MH battery, lithium battery with higher energy density is more important in safety. Therefore, in the process of using lithium batteries, a reasonable protection circuit is an essential requirement for the normal and safe operation of lithium batteries. Lithium batteries are divided into lithium metal batteries, lithium ion batteries and lithium polymer batteries; Among them, lithium metal batteries are usually used as primary and secondary batteries, that is, non-rechargeable batteries, and their discharge current is not large, and their applications are not very extensive;
Lithium battery has its safe discharge, charging and over-current limit. The protective plate is added to ensure that these values do not exceed the safety range when using lithium batteries.It is best to choose a charger with overcharge protection when charging lithium batteries.
For example, the upper limit of safe voltage of a lithium battery is 4.25V. If there is no board, it will continue to be charged when charging with a charger without overcharge protection. Just like when a person is full, you still ask him to eat all the time, and finally he will die, and so will the lithium battery. The function of the protective plate is to stop charging when he is full.The principle of discharge and overcurrent detection is the same, so the battery with protective plate can control the lithium battery to work in the specified working environment. The charging protection voltage is generally 4.25V, and the discharging protection is generally 2.75V V. The charging current can be within the maximum tolerance range of lithium batteries, and the safety is greatly improved.
2. Function of lithium battery protection board
1) Overcharge protection function:
The overcharge protection function means that when a certain voltage is reached, it is forbidden to continue charging by the charger. The overcharged MOS transistor will be controlled to turn off and stop charging.
2) Overdischarge protection function:
The function of overdischarge protection is to stop discharging the load when the voltage of the battery becomes low. Will control the over-discharge MOS tube into the off state, prohibit its discharge. This process is just the opposite of overcharge detection.
3) Overcurrent protection function:
The over-current protection function is to stop discharging the load when a large current is consumed. The purpose of this function is to protect the battery and MOS tube and ensure the safety of the battery in the state. After overcurrent detection, the battery will return to normal state after being separated from the load and can be recharged or discharged.
4) Short circuit protection function:
The principle of short-circuit protection is the same as point 3.
3. How to choose a suitable Lithium battery Protection PCBA
1) protection plate classification
1. Ferrous lithium phosphate's is 3.2V.
2. ternary lithium is 3.7V.
2) how to choose the protection current
a. according to their own load, to calculate.
First, calculate your own charging current and discharging current. This is the basis for choosing the protection board.
b. Pay attention to the charging current
Many friends buy protection boards, which have a large protection current. But I didn't pay attention to the charging current. Because the charging rate of batteries is mostly c. your charging current must not be greater than your own battery pack rate.
the battery should also be adapted to the protection board.
3) the type of protection plate
The same protective plates are suitable for machine welding and manual welding.
4. Product Qualification
BQC boasts a sprawling 15,000 square meter factory equipped with its own robust quality process management system. This system is characterized by its comprehensiveness, high standards, and efficiency. Within our factory, a dedicated quality management team rigorously oversees every stage of production across each assembly line, guaranteeing an exceptional level of PCBA production quality. With over two decades of experience in the PCBA industry since 2003, BQC has garnered a steadfast reputation for delivering top-tier product quality.
At present, our factory operates with an impressive infrastructure, including 22 SMT lines, 4 DIP lines, 4 hand soldering lines, and 3 assembly lines. Additionally, we maintain 7 conformal coating lines to further enhance our production capabilities. Supported by a dedicated team of 736 skilled employees, we efficiently utilize our expansive 15,000 square meter facility to meet the demands of our clients and uphold our commitment to excellence in manufacturing.
5. Certificates
BQC Have approved by GE,WAL-MART,UL,IKEA,ISO13485,ISO9001,ISO14001,etc.
FAQ
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1.Q：What's your MOQ for PCBA? |
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A：No MOQ for PCB and PCBA. We can do prototype and mass production as well. |
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2.Q：What are the characteristics of your company's products? |
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A：Our company has engaged in the PCB industry for over 15 years,we have strict quality, our quality standard is IPC-A-610F,every board will inspected by AOI.We make sure delivery Zero defect product to customer. |
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