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🚗 | Hitachi High-Tech develops high-speed deterioration diagnosis method for lithium-ion batteries


Hitachi High-Tech develops high-speed deterioration diagnosis method for lithium-ion batteries

If you write the contents roughly
The evaluation method developed by Hitachi High-Tech this time is said to be able to instantly analyze changes over time such as current and voltage, and make a diagnosis in a few seconds to 2 minutes.

Hitachi High-Tech will instantly evaluate the performance deterioration and remaining life of lithium-ion batteries in use and used on the 20th. → Continue reading


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It is a medium that conveys the "future" of the automobile industry, which has entered a revolutionary period once every 100 years, including MaaS (Mobiliry as a Searvice) and autonomous driving.

Wikipedia related words

If there is no explanation, there is no corresponding item on Wikipedia.

Time evolution

Time evolutionWhat is (Jikan Hatten)?TimeThe physical system changes as the process progresses.

Classical theory

Classical physicsWhat is time evolution inPhysical quantityThe value of is that it changes with time.

For example,Classical mechanicsIs a form ofNewtonian mechanicsThen, time evolutionNewton's equation of motionExpressed by. Equivalent to thisHamiltonian mechanicsThen, time evolutionCanonical equationExpressed inLagrangian mechanicsThen, time evolutionEuler-Lagrange's equation of motionIt is expressed by.

Quantum theory

Quantum theorySo no matter how the sameStatusPrepare a physical quantity in the same way (Observable), The measured values ​​are different for each measurement. In the measurement of quantum theory, it is the "probability distribution of measured values" that is uniquely determined when the state and the observable are determined. Therefore, in quantum theory, the theory is constructed based on the "probability distribution of measured values". Conversely, any theory can be made as long as the obtained "probability distribution of measured values" is the same (in fact,operatorFormat orPath integralTheories such as form are made).

Therefore, in quantum theory, the time evolution of the system is also defined using the probability distribution of the measured values. The time evolution of the system in quantum theory is that the probability distribution of the measured values ​​obtained differs depending on the time of measurement.

The time evolution formulation can be any method as long as it gives the same probability distribution of measurements. There are the following three typical methods. All three methods等価.

Time evolution operator

For closed systems, the timet State inIs the timet State at = 0TheUnitary transformationIt was done. In other wordsvectorThe length and inner product of are not changed over time (this is naturally derived from the basic equation of time evolution, such as Schrodinger equation).

This unitary transformation is oneHilbert spaceSince it is a unitary transformation within, it can be written by the operator on the Hilbert space. thisTime evolution operatorCalled (also called a time propulsion operator)Write.

This satisfies the following propertiesUnitary operator.

The equation that the time evolution operator must satisfy is from the Schrodinger equation.

Is. HamiltonianIn each case represented by, this formula is the initial conditionWhen solved as, a concrete form of the time evolution operator representing the time evolution in that case is obtained.




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