The EQS SUV comes with a 107.8 kWh lithium-ion battery with 12 cell modules and hardcase cells.

Mercedes guarantees a term of 10 years or 155,000 miles with a remaining capacity of 70 percent in the battery.

The new EQS SUV: the battery:
The EQS SUV has a lithium-ion battery with 12 cell modules and hardcase cells. Thanks to the capacity of 107.8 kWh, sufficient energy for ranges of over 600 kilometers (373 miles) according to WLTP3 be achieved.

Battery development is a decisive factor in Mercedes-Benz's electrification strategy. After all, the battery is the heart of an electric car and makes a decisive contribution to, among other things, the range and thus the driving characteristics of the electric vehicle. The EQS Sedan marks the launch of a new generation of batteries with significantly higher energy density. The new batteries set standards in terms of performance, efficiency and charging capacity.

They also meet the high Mercedes requirements in terms of safety, durability and sustainability. Mercedes-Benz issues a battery certificate for its high-voltage batteries, and thus a performance guarantee to customers: A term of 10 years or 155,000 miles with a remaining capacity of 70 percent.

Comprehensive battery expertise
The highly efficient batteries were developed entirely in-house by the team of experts at the Mercedes-Benz Battery Center of Competence. The software for the intelligent management system was also developed and programmed in-house.

The EQS SUV has a lithium-ion battery with 12 cell modules and hardcase cells. In terms of cell chemistry, a major step towards sustainability has been achieved with this generation of batteries: The optimized active material consists of nickel, cobalt and manganese in a ratio of 8:1:1. This has reduced the cobalt content to less than ten percent. The continuous optimization of the recyclability is part of Mercedes-Benz's holistic battery strategy (for details, see separate chapter on sustainability). The aim is to be able to dispense entirely with materials such as cobalt through the use of innovative post-lithium-ion technologies.

Intelligent operating strategy for more efficient charging
The battery is integrated into the intelligent thermal management of the EQS SUV. If the intelligent navigation with Electric Intelligence is activated, the battery is preheated or cooled as needed while driving to reach the optimal temperature for efficient charging at the charging point. The desired temperature range of the battery is achieved with the aid of the cooling circuit and a PTC (Positive Temperature Coefficient) booster heater integrated into it.

Complex protection concept for safety
Mercedes-Benz AG applies very high safety standards to all its models. This means that, in many cases, internal Mercedes-Benz safety standards exceed legal requirements. The crash-related requirements in particular are aligned to the "Real Life Safety" philosophy. In the process, findings from internal accident research are incorporated into the development specifications. Alongside verification of crash behavior, all Mercedes-Benz vehicles undergo additional component tests at the systems level.

The battery sits in a crash-protected area in the underbody, embedded in the body shell structure including an extruded aluminum profile on the side. In extrusion, a heated block of metal is forced through dies and transformed into a continuous profile, which is then cut to fit. In this way, highly complex profiles can be produced that are precisely tailored to the requirements. The housing with energy absorbing structures at the front and side as well as a rigid, double-walled base plate provide additional protection for the modules. The test criteria include, among other things, the battery behavior under impact load and in the event of foreign object penetration. Overheating and overcharging were also simulated and tested. In addition, there is a separate, multi-level safety system for everyday operation. This includes, for example, temperature, voltage or insulation monitoring as a continuously monitoring safety system. If a fault occurs, the battery is switched off.

Production: battery systems from Bibb County
On March 15, 2022, Mercedes-Benz opened a state-of-the-art battery plant in Bibb County, not far from the Mercedes-Benz plant in Tuscaloosa, Alabama. The production of the high-performance lithium-ion batteries for the EQS SUV and the EQE SUV is carbon-neutral. The energy storage units are assembled into a complete system on an approximately 984 yard long production line with more than 70 workstations. The individual components are assembled in a fully digitized production process, including up to twelve cell modules and the EE compartment for the intelligent integration of the power electronics. Mercedes-Benz is creating around 600 new jobs in Bibb County.

New safety and training concepts were developed for the employees at the Bibb County plant. Mercedes-Benz emphasizes particular importance to operational and occupational safety. For example, every team member who has access to the battery plant must complete comprehensive high-voltage safety training. Mercedes-Benz spends a lot of time and money on these special training courses, and they are repeated regularly.

With the new plant, Bibb County will become part of the global Mercedes-Benz battery production network, which includes factories on three continents. These include the locations in Kamenz and Stuttgart (Germany), Beijing (China), Bangkok (Thailand) and Jawor (Poland). The individual factories supply the respective local vehicle production and are also ready for export if required. Mercedes-Benz is investing more than one billion Euros in the expansion of its global battery production network. To localize key suppliers, Mercedes-Benz is partnering with one of the world's leading battery technology companies: Envision AESC. Envision AESC will supply the Mercedes-Benz battery factory in Bibb County with high-performance battery modules from a new plant in the USA. Deliveries are scheduled to begin in the middle of the decade.