Taycan Battery repair walk through

[whitex]

The Tech spoke on how the batteries were wired. Thats his understanding.

As far as as OHMs law -
Ohm's Law (V=IR) applies to both series and parallel circuits. In series circuits, the total resistance is the sum of individual resistances, and the current is the same through each component. In parallel circuits, each component experiences the same voltage, and the total resistance is less than the smallest individual resistance.

So to the comment about how the battery is wired does apply via this law.
- So don't believe every reply you see on the internet.

“Parallel rules” are not part of Ohm’s Law, hence they are listed in a separate column in the table above. There are plenty of rules used to analyze circuits, impedance (vs. just resistance), or even a rule that states that all currents into a node must add up to zero. It doesn't make them part of Ohm's law, which is "V=IR". How you obtain V or I or R is not part of Ohm's law.

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[Techwizard100]

“Parallel rules” are not part of Ohm’s Law, hence they are listed in a separate column in the table above. There are plenty of rules used to analyze circuits, impedance (vs. just resistance), or even a rule that states that all currents into a node must add up to zero. It doesn't make them part of Ohm's law, which is "V=IR". How you obtain V or I or R is not part of Ohm's law.

Wiring matters in how the voltage and power achieved. We were discussing how the battery was wired, whether it was parallel, or whether it was serial. The second level PB plus is indeed wired in parallel. At the end of the day, it ends up to the power is delivered and or multiplied.

• P = V * I: Power (P) equals voltage (V) multiplied by current (I).

I stand by my comments. I'll step back from this _____ conversation about one word in a 30 minute video!

Anytime you wanna hop off the couch and make your own video will be standing by to critique. Have a nice day.

 

[whitex]

I am actually an engineer just so you know and yes, wiring matters in how the voltage (V)OHM's Law is achieved to power. We were discussing how the battery was wired, whether it was parallel, or whether it was serial. At the end of the day, it ends up to the power is delivered and or multiplied.

• P = V * I: Power (P) equals voltage (V) multiplied by current (I).

Do you think they put parallel rules on the chart next to Ohms law for no reason? I stand by my comments. I'll step back from this conversation. Have a nice day.

Actually, now that I think about it a little more, in the Taycan battery the modules are connected in series, not in parallel, therefore none of the "Parallel Rules" you supplied apply - all the voltages add up, which is opposite to what your table shows under "Parallel Rules", and all the currents are the same, the formula in your tables shows them adding up. Are you now going to look for a table with Ohms Law and "Series Rules" next to it so you can claim it's part of Ohm's Law?

PS> P=V*I is not Ohm's Law either. Wikipedia has a good description of what Ohm's Law is:
https://en.wikipedia.org/wiki/Ohm's_law

 

[M3Taycan]

Here is some additional information:

198s2p: Battery pack configuration involving 198 cells in series (S) and 2 sets of these cells in parallel (P).

Voltage: The total voltage of the ‘198s2p’ configuration can be calculated by multiplying the voltage of a single cell (typically around 4.1V for lithium-ion cells) by the number of cells in series. For example, if each cell is 4.1V, the total would be 198 x 4.1V = 811.8V. This is an assumption.

Current: The current capacity is determined by the number of parallel sets. If each cell has a capacity of say 55Ah, the total current capacity would be 55Ah x 2 = 110Ah (peak). This is an assumption.

Power = Current * Volts = Watt
P = 110A * 811.8V = 89298 Watts = 89.3KW

P = Current^2 * Resistance
P = Volts^2 / Resistance

Ohms Law: Resistance = Volts^2 / Power = Power^2 / Current = Volt / Current

 

[whitex]

Here is some additional information:

198s2p: Battery pack configuration involving 198 cells in series (S) and 2 sets of these cells in parallel (P).

Voltage: The total voltage of the ‘198s2p’ configuration can be calculated by multiplying the voltage of a single cell (typically around 4.1V for lithium-ion cells) by the number of cells in series. For example, if each cell is 4.1V, the total would be 198 x 4.1V = 811.8V. This is an assumption.

Current: The current capacity is determined by the number of parallel sets. If each cell has a capacity of say 55Ah, the total current capacity would be 55Ah x 2 = 110Ah (peak). This is an assumption.

Power = Current * Volts = Watt
P = 110A * 811.8V = 89298 Watts = 89.3KW

P = Current^2 * Resistance
P = Volts^2 / Resistance

Ohms Law: Resistance = Volts^2 / Power = Power^2 / Current = Volt / Current

Taycan battery max current, and therefore output power is significantly higher than your calculation of 89.3KW (which would mean Taycan peaks at ~120hp). 1Ah is not the same thing as 1A - they measure totally different things. Ah cannot be used for power calculations.

Also, Ohms law does not have Power in it. You can factor in power by using P= VI, but that is not part of Ohm's law.

 

[M3Taycan]

Taycan battery max current, and therefore output power is significantly higher than your calculation of 89.3KW (which would mean Taycan peaks at ~120hp). 1Ah is not the same thing as 1A - they measure totally different things. Ah cannot be used for power calculations.

Also, Ohms law does not have Power in it. You can factor in power by using P= VI, but that is not part of Ohm's law.

I only have one last question. How is Ohm's Law derived from Maxwell's Equations? I could derive it by partial differential equations, but here is the alternative.

1. J current density = Conductivity of the material * Electric Field
2. I = Integral (J current density) dArea = Total Current
3. Electric Field = Voltage/Length of the conductor = V/L: The voltage across a conductor, produces an electric field
4. E = V/L
5. I total current = conductivity of the material * V/L= V/ Resistivity. 1/R is called the conductance.
6. I = V/R
7. V = IR is Ohms Law - the voltage across a conductor is directly proportional to the current flowing through the material.
8. Ohm’s Law can be derived from Maxwell’s Equations by establishing the relationship between electric fields and current densities in conductive materials.
9. There is a fundamental connection between these essential concepts in electromagnetism.
10. Power is absorbed by the material (resistor) when Ohm's Law V=IR is applied. P = IV = V^2 * R = I^2/R
11. The material dissipates heat.
12. We all have an EV and it dissipates heat when operational.
13. I rest my case. Enjoy!
    
    
    
    
    
    

 

[whitex]

How is Ohm's Law derived from Maxwell's Equations?

I think the answer is you have a false premise question here - according to wikipedia on Ohm's Law:

Ohm's work long preceded Maxwell's equations and any understanding of frequency-dependent effects in AC circuits. Modern developments in electromagnetic theory and circuit theory do not contradict Ohm's law when they are evaluated within the appropriate limits.

This means Ohm's Law was not derived from Maxwell's Equations.

Power = Current * Volts = Watt
P = 110A * 811.8V = 89298 Watts = 89.3KW

Did you derive your calculations which state max power that can be delivered by the Taycan HV battery is 89.2KW (~120hp) from Maxwell's equations?

 

[refazi]

Interesting video with a 918 battery teardown (+rich comedy)

This tech might come to Taycan in this decade

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