When the lithium battery begins to fail, there is usually a quick response, first of all, it is obvious that the run is not far, the original lithium battery can run 50 kilometers, after the failure, may not run 10 kilometers to run out of power. And charging is also quickly filled. Many people will think that the lithium battery is scrapped, but not, often lithium batteries appear rapid mileage shrinkage is usually due to battery pack imbalance, the effectiveness of a battery cell will lead to the problem of the whole group.
(A) the lithium battery failure phenomenon summary and simple troubleshooting methods.
(1) the normal battery suddenly completely unresponsive, this phenomenon may be a short circuit in the positive and negative terminals of the battery caused by the mos tube disconnected, or the battery fuse burned due to a short circuit. Troubleshooting method, usually charge the battery can activate the battery, if charging can not be activated, you need to check the battery fuse, it may be in the battery output line, may also exist in the protection board.
2) The range suddenly shrinks severely, and can be fully charged very quickly, when this failure occurs, we must immediately stop using this battery, do not try to charge the battery for a long time to try to force the power to replenish. This is counterproductive and will make the fault more serious. This failure will be more trouble to deal with, but it is not impossible to solve.
3) After a long period of use, the range is slowly shortened, and there is a significant difference with the new battery, but every time after charging the use of normal, this failure phenomenon belongs to the normal capacity of the lithium battery failure, which is irreversible. Please do not try to repair. Net rumors of deep discharge activation applies to a single lithium battery, or the voltage is not high, usually below 20V lithium battery can do so try. Older batteries with higher voltages in multiple series and parallel should not be attempted.
(B) electric car lithium battery range rapid shrinkage troubleshooting methods.
(1) preparation tools (personal players): multimeter (for measuring voltage), lithium battery charger (with capacity test function best) (single 3.7V, 4.2V charger), soldering iron (not with spot welding equipment can be used, the method will be emphasized later), nickel or pure copper wire, a number of spare lithium cells of the same brand type.
Prepare tools (professional workshop): multimeter, lithium battery capacity separation equipment, battery internal resistance tester, spot welding machine, nickel sheet, a number of spare lithium cells of the same brand type.
(2) prepare the work area, the work area do not place debris, must ensure that the work area clean and tidy (need to disassemble the cell part, such as metal objects lead to short circuit will complicate the battery condition, unclean environment may lead to foreign objects left inside the battery safety hazards)
(3) the first step in the preparation of work, the battery pack to be repaired placed in the operating area, unpacking until the bare internal cells, (such as metal casing please remove the metal casing first)
4) The second step of the work, check the combination of battery form, in order to reduce the internal resistance of each area of the battery, some companies will arrange the combination of cells in accordance with the shaped way, the purpose of doing so can reduce the resistance between the cells and extend the service life of the battery. So the first step we must know clearly the combination way of battery pack cells.
(5) measure and record the value of the voltage of each string of cells in turn, to find the voltage is clearly different from the other string, and then use a multimeter to measure the voltage value of each cell in the string, the same principle, to find out clearly different from the other one of the abnormal cells. (Usually the main problem is caused by an abnormal cell failure, but for insurance purposes, you can also mark and record the other abnormal cells, individually aligned to do sub-volume testing)
6) In a string of normal voltage combination, in order to collect the normal battery capacity data, randomly select a few grains using the capacitance tool to align the capacitance and measure the internal resistance data. (Directly lead the line in the negative position of the single cell, the positive electrode needs to avoid the nickel piece directly from the positive electrode, must be disconnected from the positive or negative electrode connected to the battery to get the correct capacity situation.) Note: This step is for the preparation of fine repair, do not have the conditions can be ignored.
7) Remove the abnormal cells and fill all the normal cells, there are many ways here, please make up your own mind. Can be single-string charging, can also be multi-string charging, but to no protection plate battery combination charging, please be sure to always pay attention to its state.
8) The same brand and model of the same battery cell will be fully charged in advance, installed to the location of the abnormal battery cell. (Note: Strictly speaking, the lithium battery pack in the repair needs to be discharged to the best state of the single cell 3.6V, which will reduce the degree of danger of the operating process, this tutorial is mainly to consider that the vast majority do not have such equipment, allowing the battery to be discharged to the specified voltage, so choose to fill to full charge the standard to implement the operation, in addition to pay attention to, please do not put the voltage inconsistent to be replaced In addition, please note that please do not replace the cells to be replaced with inconsistent voltage directly into, this may lead to damage to the battery. The reason is very simple, if the battery pack single string is 6 and need to replace a cell, 5 cells are full charge, the new replacement cell is empty state, the lithium cell itself does not have a protection plate, the discharge will be discharged at maximum current, generally used to make electric car lithium batteries are usually power cells, full power discharge will produce a large current, if there is an empty state of the cell access, will force the full charge of 5 cells will be discharged at maximum current. If there is an empty battery cell, it will force the full charge of the 5 battery cells to fill the newly installed empty battery cell with the maximum current. (Excessive current can instantly burn the battery when serious)
(9) recovery of good battery, temporarily not encapsulated, good protection measures for a charge and discharge operation. (Of course, the whole group of batteries can do a sub-volume, if there is no condition, you can do a single string sub-volume, and a normal string to do a comparison, no abnormalities after the encapsulation of the battery, the whole group of lithium battery repair is complete.)
(C) lithium battery repair special attention.
(1) clean and tidy operating environment, no debris
(2) prepare tools in advance, and think about the processing process, do not be fumbling, disassembled lithium batteries have a certain degree of danger.
3) Do not wear rings, or metal necklaces and other items to avoid causing a short circuit
4) need to observe the structure of the battery in advance. Avoid misuse.
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