Analysis of Hyundai E-GMP electric vehicle platform battery and charging program

A few days ago Hyundai officially announced the Electric Global Modular Platform (Electric?-?Global?Modular?Platform, E-GMP), the much-anticipated dedicated platform for pure electric vehicles developed together by Hyundai Kia, which will be the centerpiece of Hyundai Kia's development of electric vehicles. From 2021, Hyundai Kia will launch a series of pure electric vehicles developed on E-GMP, including Hyundai's IONIQ?5 and Kia Motors' first forward-developed pure electric vehicle, the CV. By 2025, Hyundai Kia will launch 23 pure electric vehicles, including 11 E-GMP EV-specific models, with the goal of selling 1 million EVs annually.

So what about this EV-specific platform? I think we can look at it one by one in terms of battery system, charging system, electric drive system, intelligence, and so on, with today's brief analysis of battery and charging.

Figure 1: Overview of the E-GMP battery system

Battery system

The E-GMP platform is designed according to the modularity and standardization of the battery. Looking at the battery system as a whole, it is configured as the same large flat plate as the MEB, with an ICCU arranged on top of the battery system, which will be mentioned later in the charging section.

Figure 2?E-GMP Battery System Overview

The battery system uses small modules along the direction of the front end of the car to form a large module, which divides the battery system into 6-8 large modules, with each large module consisting of 4 standard small modules. As shown in the figure below, the cooling panels of the whole system are in external mode, which is basically exactly the same as in the case of MEB.

Figure 3?Overview of 8 large modules (32 small modules)

Figure 4?Overview of 6 large modules (24 small modules)

The E-GMP standard module uses soft-packed cells, which, according to previous reports in the South Korean media, are supposed to be purchased in subcontracts, including those provided by LG Chem and SK, and the standard cell model is used here. The number of cells per module may be 12, and a large module contains 48 cells, projecting that the PACK has 288 or 384 cells.

Figure 5: Module structure of E-GMP

The structure of the module is similar to that of the previous Hyundai technical paper, with the elimination of the Cooling pin between the cells, the use of Gap filler at the bottom of the cells for adjustment, and the use of thermal conductivity through the bottom of the cooler for heat conduction, and the use of straps on the small module to strengthen the rigidity of the module. Rigidity. This to support "in 350kW power, 18 minutes can be charged 80%", is to consider the complete large module brought about by the uneven stress, as well as uneven heat dissipation problems.

Figure 6?E-GMP's module design

E-GMP's 400V/800V charging

In terms of charging, E-GMP is designed with different voltage platforms in mind. On top of the high-end 800V system, the 800V charging station charges the battery system directly, while on the 400V charging post, the voltage is boosted by the motor electric control system and then charged into the battery system.

Figure 7?Hyundai's 400V/800V charging system

Figure 8?Hyundai's 400V charging path

This on-board charger is an integrated solution using the familiar charger and DCDC, with 11kW of power and 3.5kW of V2L capability.

Figure 9: Hyundai Kia's ICCU arrangement

Summary: The design of this E-GMP platform is based around soft-core batteries, assembled in a way that small modules make up large modules, probably because Hyundai Kia is trying to balance the supply of LG?Chem and SK, and there's a chance that it could also incorporate square-case batteries into the design.

Figure｜Web and related screenshots

Author introduction: Zhu Yulong, senior EV triboelectric system and automotive electronics engineer, author of "Automotive Electronics Hardware Design".

This article comes from the author of Automotive Home, and does not represent the viewpoint position of Automotive Home.