How to Add Battery Equivalent Circuit on Rectifier Output?

I am currently working on the design of a differential-drive rectifier circuit which will be used to re-charge a NiMH rechargeable battery (button cell) particularly V150H of Varta battery.

Battery specifications: https://products.varta-microbattery.com/applications/mb_data/documents/data_sheets/DS55615.pdf

I am using a 3-stage rectifier of this design



My question is, how should I take account the battery equivalent circuit on the schematic? And what would be my battery equivalent circuit? How should I connect it on the system?

Thanks. I really appreciate all your help.

The closest approximation I have been able to make is a capacitor sometimes, or a voltage source sometimes.

The capacitor imitates the battery charging. It tells whether charging occurs, whether the circuit tapers the charge rate, or halts, or continues charging indefinitely.

The voltage source tells how the presence of a battery influences Ampere levels. It is a predictable component. Its waveform can be set as DC, or undulating up and down.

Neither component is a correct model. Nevertheless they are simple models. I have also tried a series capacitor and voltage source, I have tried adding a resistor in parallel, resistor in series. Etc. However I find that battery charging is complicated, since we must keep an eye on several behaviors:

* changing battery volts,
* Ampere levels in the battery,
* Ampere levels in the power supply,
* power wastage in components,
etc.

A resistor in series creates some degree of realism in the simulation, and can be scoped in order to observe waveforms. Moreover a simulation may require that we put a resistor in series with the capacitor or voltage source.

You could use a large capacitor (in the multiple Farad size) in parallel with a voltage-source in series with a diode (cathode to plus) and possibly a small resistor.
The capacitor simulates the charging of the battery while the voltage-source-diode-resistor simulates the battery when it reaches full charge by limiting the voltage to the voltage-source value plus the resistor and diode forward drop.