[Dry goods] Analysis of Audi A6 PHEV battery pack and thermal management

by:CTECHi     2021-08-22

Lithium Grid News: In a meeting report of Audi in February 2017, the editor extracted some information about the battery pack and thermal management of the Audi A6 PHEV for everyone to share.

Audi A6 uses a 2.0L turbocharged engine, the picture can clearly see the high-voltage battery pack is located in the rear trunk of the car body, under the battery pack is the on-board charger.

In terms of performance, the system power is 180KW, the maximum speed is 135Km/h in electric drive mode, and the cruising range in pure electric mode is 50Km, which is about 31.25 miles.

Let's take a look at the comparison, the pure electric mode cruising range of other models, comprehensively consider the urban working conditions, highway working conditions and combined comprehensive working conditions. It can be seen that the cruising range of 31.25miles is quite satisfactory.

Battery pack structure:

Battery pack technical parameters:

This is the data of the battery cell. We can see that the battery core is NCM37Ah with an energy density of 195Wh/kg.

Module data

In terms of mechanical structure, considering the lightweight design, the bottom of the Audi A6 PHEV battery pack is made of aluminum extrusion The pressure profile, the upper cover is double-layer stamped and welded with aluminum sheet, the battery pack has high rigidity after being assembled into a whole, and the impact resistance is also very good. Of course, this also puts forward higher requirements for welding at the seam.

Different location module interchangeability

Before we learned that the battery pack has a peak discharge current of about 9C , The parameter data of the duration of 18S, next we look at the peak charge and discharge power available under different SCO and temperature.

It can be seen that the available SOC window and temperature range of high peak discharge power are still relatively wide, and the maximum power of on-board charging can also be in a wide range. Within 7.2KW.

I won't go into details, let's finally look at the cooling method of the battery pack. Two cold plates, 4 13S1P modules are arranged on each cold plate.

Let’s take a look at the heat dissipation path of the battery system. The heat generated by the battery cell passes through the heat sink, the peripheral metal bracket of the module, and the heat dissipation pad to the cold plate, and then cools through the cold plate. The agent takes the heat away.

As the next step of optimization, the Audi A6 PHEV battery pack considers to further increase the energy density of the battery pack and increase the range of pure electricity on the one hand, and on the other hand, to reduce the cost, we will wait and see.

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