Charging Time is key for high product quality.

But how to achieve charging times of
less than 15 min ?

Challenge

The fast-charging capability is a decisive purchase require­ment, not only for electric vehicles. Five bound­aries are techni­cally restricting the charging time as shown below. Violating the cell-specific limits leads to accel­er­ated cell aging or even safety risks. The progres­sion of the maximum permis­sible charging current over time, consid­ering all five limits, depends on the electro­chem­ical and thermal initial and boundary condi­tions in a strongly nonlinear manner. In addition, as the anode surface poten­tial inside the cell is not exper­i­men­tally acces­sible, the suitability of a charging current profile can only be tested indirectly by costly and time-consuming cycling tests. 

The five limits of fast-charging

1

power

Limited by power grid. 

2

current

Limited by charger current. 

3

temper­a­ture

Limited by battery cell (temper­a­ture-induced aging). 

4

voltage

Limited by battery cell (voltage-induced aging). 

5

anode

Limited by battery cell (lithium-plating aging). 
Moreover, the fast charge capability of the battery is depen­dent on module design, cooling, cell type and there­fore has to be solved on system level. This is why the devel­op­ment of optimal current profiles in the multi­di­men­sional, nonlinear parameter space consisting of time, state of charge, state of health and temper­a­ture is challenging. 

Solution

You need a tool to predict all five limits under given operating condi­tions for individual cells and modules. And that is what the Batemo Cell Model is. Batemos unique battery model­ling technology allows to derive optimal fast-charge profiles for the entire parameter space. This is the basis for an optimized testing design to exper­i­men­tally validate the numer­i­cally calcu­lated fast-charge profiles at carefully selected different opera­tion condi­tions. This straight­for­ward workflow simul­ta­ne­ously reduces charging time, devel­op­ment time and devel­op­ment cost. 
If you have a physical, param­e­trized and validated model… 
…you can calcu­late an optimal fast-charging strategy based on simulations. 
batemo_Folienmaster_Icon_orange_02

Fast

Batemo Cell Models run within seconds on normal office computers. This enables large parameter varia­tion to consider the nonlinear depen­den­cies on temper­a­ture, SOC and aging state. 
batemo_Folienmaster_Icon_orange_29

Physical

Only if you split up the physical processes in the cell correctly, you can calcu­late the anode surface poten­tial and access all five limits of fast charging simultaneously.

batemo_Folienmaster_Icon_orange_09

Accurate

Quanti­ta­tivly reliable simula­tion results need exten­sively validated models. The Batemo Cell Model is the most accurate battery cell model there is – guaran­teed! We always demon­strate the validity through exten­sive measure­ments that prove highest accuracy. 
Our method­ology is to actively control the anode surface poten­tial and thereby avoid lithium plating as shown in the example below. Thereby you reach the physi­cally fastest possible charge profiles under all operating condi­tion. The low compu­ta­tional times allows to automat­i­cally repeat this calcu­la­tion under all initial and boundary condi­tions to derive ready to imple­ment fast charge maps. 

devel­op­ment method

  • 1st

    Get the Batemo Cell Model to have a physical, parame­ter­ized and validated battery cell model. 

  • 2nd

    Integrate the cell model into your module model. 

  • 3rd

    Do batch simula­tions and derive optimal fast charging profiles and opera­tional strate­gies.

    avoid lithium plating!
  • 4th

    Use the Batemo Cell Model to do a design of valida­tion experiments. 

  • 5th

    Perform the valida­tion exper­i­ments and directly imple­ment it in your BMS!

Advan­tages

Use the Batemo Cell Model for simula­tion-based fast-charge devel­op­ment, making it faster and at lower cost while leading to lower charging times. This is how we generate value and contribute to your success. 
batemo_Folienmaster_Icon_orange_04

Better

Reliably detect and prevent plating by having direct access to the anode surface poten­tial. Simulate large parameter sweeps to prevent lithium plating at all opera­tion condi­tions instead of exper­i­men­tally spot check. 
batemo_Folienmaster_Icon_orange_02

Faster

Cut down the charging time to the physical minimum by having access to all five limits at the same time. Optimize your total system or even consider cell design varia­tions to push fast charging to a whole new level. 
batemo_Folienmaster_Icon_orange_34

Lower cost

Take a straight­for­ward workflow instead of cycle test in trial-and-error principle. Reduce test efforts to the minimum by utilizing digital devel­op­ment methods. Do your DOE simula­tion based, to identify the relevant test cases rapidly. Test smarter, not harder.

Inter­ested?

Let’s take the first step!

Meet the expert