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 requireĀ­ment, not only for electric vehicles. Five boundĀ­aries are techniĀ­cally restricting the charging time as shown below. Violating the cell-specific limits leads to accelĀ­erĀ­ated cell aging or even safety risks. The progresĀ­sion of the maximum permisĀ­sible charging current over time, considĀ­ering all five limits, depends on the electroĀ­chemĀ­ical and thermal initial and boundary conditions in a strongly nonlinear manner. In addition, as the anode surface potenĀ­tial inside the cell is not experĀ­iĀ­menĀ­tally accesĀ­sible, 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

temperĀ­aĀ­ture

Limited by battery cell (temperĀ­aĀ­ture-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 depenĀ­dent on module design, cooling, cell type and thereĀ­fore has to be solved on system level. This is why the development of optimal current profiles in the multiĀ­diĀ­menĀ­sional, nonlinear parameter space consisting of time, state of charge, state of health and temperĀ­aĀ­ture is challenging. 

Solution - Battery Fast Charging

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 modelĀ­ling technology allows to derive optimal fast-charge profiles for the entire parameter space. This is the basis for an optimized testing design to experĀ­iĀ­menĀ­tally validate the numerĀ­iĀ­cally calcuĀ­lated fast-charge profiles at carefully selected different operaĀ­tion conditions. This straightĀ­forĀ­ward workflow simulĀ­taĀ­neĀ­ously reduces charging time, development time and development cost. 
If you have a physical, paramĀ­eĀ­trized and validated modelā€¦ 
ā€¦you can calcuĀ­late an optimal fast-charging strategy based on simulations. 
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Fast

Batemo Cell Models run within seconds on normal office computers. This enables large parameter variaĀ­tion to consider the nonlinear depenĀ­denĀ­cies on temperĀ­aĀ­ture, SOC and aging state. 
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Physical

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

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Accurate

QuantiĀ­taĀ­tivly reliable simulaĀ­tion results need extenĀ­sively validated models. The Batemo Cell Model is the most accurate battery cell model there is ā€“ guaranĀ­teed! We always demonĀ­strate the validity through extenĀ­sive measureĀ­ments that prove highest accuracy. 
Our methodĀ­ology is to actively control the anode surface potenĀ­tial and thereby avoid lithium plating as shown in the example below. Thereby you reach the physiĀ­cally fastest possible charge profiles under all operating condiĀ­tion. The low compuĀ­taĀ­tional times allows to automatĀ­iĀ­cally repeat this calcuĀ­laĀ­tion under all initial and boundary conditions to derive ready to impleĀ­ment fast charge maps. 

development method

  • 1st

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

  • 2nd

    Integrate the cell model into your module model. 

  • 3rd

    Do batch simulaĀ­tions and derive optimal fast charging profiles and operaĀ­tional strateĀ­gies.

    avoid lithium plating!
  • 4th

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

  • 5th

    Perform the validaĀ­tion experĀ­iĀ­ments and directly impleĀ­ment it in your BMS!

AdvanĀ­tages

Use the Batemo Cell Models for simulaĀ­tion-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. 

-20%

Charging Time

Cut down the charging time to the physical minimum by having access to all five limits at the same time. 

-50%

Development Time

Speed up your development time by relying on a straightĀ­forĀ­ward workflow instead of cycle tests in trial-and-error principle. 

-60%

Development Costs

Safe test efforts by utilizing digital development methods. Test smarter, not harder.
Check the Facts

Charging Time

Batemos unique technology enables to reach the physiĀ­cally fastest possible charge profiles by actively controlĀ­ling the anode surface potenĀ­tial. Without access to the anode surface potenĀ­tial, the only way is to apply stepped charge profiles while increĀ­menĀ­tally increasing your charge current and monitoring your cell aging. This trial-and error approach will never yield the real optimum as shown in the picture below. Even an optimal stepped charge profile stays 20% behind the physical optimum for the Tesla Model Y (4680) cell. 

Example: Tesla Model Y (4680)

Development Time and costs

Batemos unique technology enables setting up a straightĀ­forĀ­ward development workflow by predicting the anode surface potenĀ­tial. Without access to the anode surface potenĀ­tial, you must iteraĀ­tively try out charge profiles and check their applicĀ­aĀ­bility in cycling tests. This trial-and-error approach is cost- and time consuming. 

Without Batemo Technology

apply charge profile and conduct test 

With Batemo Technology

get a Batemo Cell Model

calcuĀ­late optimized profile 

validate

Letā€™s check one example: 4 iteraĀ­tions of experĀ­iĀ­mental trial-and-error fast charge development takes about 7 months. When applying 2 profiles simulĀ­taĀ­neĀ­ously, you can only test 8 different charging profiles. Even for a small cylinĀ­drical cell this adds up to ā‰ˆ90kā‚¬ personnel and measureĀ­ment expenses. Letā€™s do this straightĀ­forĀ­ward: with a Batemo Cell Model you can calcuĀ­late optimized charge profiles for all operaĀ­tion and starting conditions within days. Including the Batemo Cell Model generĀ­aĀ­tion, we have those profiles ready and experĀ­iĀ­menĀ­tally validated within three months. Adding software costs, personnel and measureĀ­ment expenses for validaĀ­tion you stay below 30kā‚¬.

InterĀ­ested?

Letā€™s take the first step!

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