What is lithium battery maintenance board?
Lithium battery maintenance board is the charge and discharge maintenance of series lithium battery pack; it can ensure that the voltage difference between each single cell is less than the set value (generally ±20mV) when it is fully charged to achieve the equal charging of each single cell in the battery pack, which effectively improves the charging effect in the series charging mode; at the same time, it detects the over-voltage, under-voltage, over-current, short-circuit and over-temperature conditions of each single cell in the battery pack to maintain and extend the battery operation. Under-voltage maintenance prevents the battery from being damaged due to over-discharge when each single cell is discharged.
There are two main components of the lithium battery, lithium battery core and maintenance plate, lithium battery core is mainly composed of positive plate, barrier, negative plate, electrolyte; positive plate, barrier, negative plate around or laminated, packaging, filling electrolyte, encapsulation is made of battery cells, lithium battery maintenance plate effect many people do not know, lithium battery maintenance plate, the lithium battery maintenance plate, the lithium battery maintenance plate is the effect of The effect of the lithium battery maintenance board is to maintain the battery but not to discharge, but not to charge, but not to flow, and is the output short circuit maintenance.
Why some lithium maintenance board needs to be activated lithium battery how to activate the maintenance board
Lithium battery maintenance board technical parameters
Equilibrium current ：80mA (when VCELL=4.20V)
Equalization starting point : 4.18±0.03 V overcharge threshold : 4.25±0.05 V (4.30±0.05 V optional)
Over-discharge threshold: 2.90±0.08 V (2.40±0.05 V optional)
Over-discharge delay time: 5mS
Over-release: disconnect the load, and the voltage of each single cell is higher than the over-release threshold.
Over-current release: disconnect the load and release
Over-temperature maintenance: there is an interface, and a recoverable temperature maintenance switch is required.
Operating current: 15A (according to customer selection)
Static power consumption: "0.5mA
Short-circuit maintenance function: can maintain, disconnect the load can be self-recovery.
Main functions: overcharge maintenance function, over discharge maintenance function, short circuit maintenance function, over current maintenance function, over temperature maintenance function, balance maintenance function.
Interface definition: the charging port and the discharge port of the board are independent of each other, both of them share the positive pole, B- is the negative pole of the connected battery, C- is the negative pole of the charging port; P- is the negative pole of the discharge port; B-, P-, C- pads are all over-hole type, pad hole diameter are 3mm; each charging detection interface of the battery is output in the form of DC pin holder.
Parameter clarification: the configuration of the maximum operating current and overcurrent maintenance current value, unit: A (5/8, 8/15, 10/20, 12/25, 15/30, 20/40, 25/35, 30/50, 35/60, 50/80, 80/100), special overcurrent value can be customized according to customer requirements.
Why some lithium maintenance board needs to be activated_lithium battery maintenance board how to activate
Detailed analysis of the principle of lithium battery maintenance board
As we all know, lithium battery is a new energy battery used in various fields today, but the lithium battery needs maintenance board maintenance many people do not know, the maintenance board plays a vital role in the use of the battery, the following we will understand the structure of the maintenance board and its maintenance principle.
Maintenance board has two central components: a maintenance IC, which is a precise comparator to obtain reliable maintenance parameters. The other is a MOSFET string in the main discharge circuit to act as a high-speed switch to perform maintenance actions, and the IC manipulates the MOS tube by supervising the battery voltage difference. The general maintenance board also has resistors, capacitors, and auxiliary FUSE, PTC, NTC, ID, storage, etc. The B+ and B- on the maintenance board are connected to the positive and negative electrodes of the battery cell, respectively. As shown in the figure is a maintenance board schematic.
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The maintenance board will perform overcharge maintenance, overdischarge maintenance, short circuit maintenance, overcurrent maintenance, and temperature maintenance on the battery.
Lithium battery requires constant current and voltage when charging. At the beginning of charging, it is constant current charging, and with the charging process, the voltage rises to a certain value and turns to constant voltage charging until the current becomes smaller and smaller. Battery in the process of being charged, if the charging circuit loses control, it will make the voltage exceed a certain value of constant current charging, battery voltage will also continue to rise, will lead to battery damage or security problems. When there is a maintenance board in the battery, the overcharge maintenance function of the maintenance board will start, and block the MOS tube to stop charging the battery pack to maintain the safety of the battery.
Other kinds of maintenance in the same way, the maintenance board will time to monitor the battery of various situations occur, and take maintenance measures.
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Why some lithium maintenance boards need to be activated
Now not all lithium battery maintenance board needs to be activated, only some maintenance IC needs to be activated, and this is the old IC program, the old IC program so the need to do so is to let the maintenance board does not work to reduce the electrostatic discharge energy, so that the lithium battery stored longer. This is the reason why the planning needs to be charged to activate the location.
The lithium battery maintenance board uses a field effect transistor as a maintenance element. The circuit is specially planned to ensure that the battery is not connected to the circuit from scratch in case of abnormality. The method is that the power supply of the control part of the maintenance circuit is supplied behind the maintenance field effect tube, and the circuit will operate only after the maintenance tube is normally on. Therefore, when it is used for the first time or after maintenance has occurred, the maintenance circuit cannot operate because the power supply of the subsequent circuit is disconnected and the circuit has no power supply. The battery also has no output. At this time, as long as the battery is connected to the charger, the charger will supply power to the control circuit of the maintenance circuit, and the control part will be powered to operate, so that the battery can be used normally.
How to activate the maintenance board of lithium battery
If the maintenance board because of current-limiting maintenance, there may be a need to charge the activation or completely disconnect the load after activation, it is relatively troublesome, but also can be B- (battery negative) and P- (discharge negative) short touch, the maintenance will be released, remember that in the short touch remember not to bring a large load (such as turn the bar has been screwed), otherwise it may be a great spark yo, the underlying cause of maintenance after the discharge MOS terminals to form a large voltage difference, short touch is the discharge MOS D-S level directly reset to 0V, at this moment the maintenance release.
Note: should be most of the board are common, even if some can not, so touch will not cause damage to the board.
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