Analysis of abnormal charging of DC charging pile

Last time we talked about the normal charging process of the DC charging pile, then the problem is, what are the abnormal conditions when the DC charging pile is charged? We may wish to find out, to facilitate the charging of the pile system in the future.

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First, let's briefly review the essence of last week, the DC charging model:

Figure 1 DC charging model

On the left is the off-board charger (ie DC charging pile), and on the right is the electric car, which are connected by the vehicle plug and socket. We can clearly see that the charging model is mainly composed of three parts: “non-vehicle charger”, “vehicle interface” and “electric vehicle”, so the abnormal suspension of charging is basically caused by these three parts, then we will A “physical examination” analysis of these three parts.

The first type of illness: abnormal charging suspension caused by the part of the off-board charger.

Figure 2 non-vehicle charger abnormalities

1) During the charging process, if the off-board charger has a failure to continue charging (such as accidental water ingress or foreign matter entering the charging pile, sudden change in ambient temperature, etc.), send "charger stop charging message" to the vehicle cycle and Control the charger to stop charging, disconnect K1, K2, K3 and K4 within 100ms;

Figure 3 non-vehicle charger failure

2) During the charging process, if the non-vehicle charger control device has a communication timeout (such as a communication line failure, etc.), the off-board charger stops charging, and disconnects K1, K2, K5, K6 within 10s, and does not charge the vehicle. When the machine control device occurs 3 times of communication timeout to confirm the communication interruption, the off-board charger stops charging, and disconnects K1, K2, K3, K4, K5, K6 within 10s;

Figure 4: Non-vehicle charger communication is abnormal

3) During the charging process, if the output voltage of the off-board charger is greater than the maximum allowable total charging voltage of the vehicle (such as the charging post output voltage limiting function is invalid), the off-board charger should stop charging within 1 s and disconnect K1. K2, K3, K4;

Figure 5 Off-board charger output voltage> vehicle maximum allowable charging voltage

The second type of illness: the abnormal suspension of charging caused by the vehicle plug and the vehicle socket.

Figure 6 vehicle plug | vehicle socket abnormal

1) During the charging process, the off-board charger control device detects the voltage at the detection point 1. If it is determined that the switch S is changed from closed to open (such as a button failure or false trigger on the charging gun), it should be within 50 ms. Reduce the output current to 5A or below;

Figure 7 Vehicle plug internal normally closed switch S disconnected

2) During the charging process, the off-board charger control device detects the voltage of the detection point 1 and determines that the vehicle interface is changed from full connection to disconnection (such as accidental movement of the vehicle, accidental disturbance of the charging gun cable, etc.) Then control the off-board charger to stop charging, and disconnect K1, K2, K3, K4 within 100ms.

Figure 8 vehicle interface disconnected

The third type of illness: the abnormal suspension of charging caused by electric vehicles.

Figure 9 electric car abnormalities

1) In the charging process, if the vehicle has a fault that cannot continue to be charged (such as the BMS system falsely reports the battery real-time status, the vehicle control device incorrectly turns off the charging circuit contactor, etc.), then the vehicle is stopped to send the "vehicle stop charging report". "" and disconnected K5 and K6 within 300ms (determined by the vehicle based on the severity of the fault).

Figure 10 The vehicle has a failure to continue charging

The abnormal situation that may occur during the charging process of the DC charging pile is summarized here. The friends who are interested in the charging pile and the charging pile testing system remember to collect the collection, and then there will be more exciting content to share.

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