Apparatus for mining battery characteristic data having sensitivity to volume fraction of active material of battery electrode and method thereof

Patent metadata

Field	Value
Publication number	US-2022013813-A1
Application number	US-202117370394-A
Country	US
Kind code	A1
Filing date	Sep 20, 2021
Priority date	Jul 9, 2020
Publication date	Jan 13, 2022
Grant date	—

Abstract

Disclosed is an apparatus and method for mining battery characteristic data, which calculates a particle surface concentration (cse,i) of lithium from a first state space model derived from a Pade approximation equation of a transcendental transfer function, calculates a change ratio⁢∂cse,i∂?⁢(t)?⁢indicates text missing or illegible when filedof the particle surface concentration to the change in the active material volume fraction from a second state space model derived by the partial derivative of the Pade approximation equation, calculates a change ratio⁢∂ηi⁡(t)∂ɛ⁢??⁢indicates text missing or illegible when filedof over-potential to the change in the active material volume fraction from the Butler-Vollmer equation, calculates a potential slope∂Ui∂cse,icorresponding to the particle surface concentration by using an open circuit potential function, and stores voltage-current data in which the sensitivity of the battery voltage to the active material volume fraction of the electrode calculated from∂Ui∂cse,i,∂cse,i∂ɛs,i⁢(t)⁢⁢and⁢⁢∂ηi⁡(t)∂ɛs,iis greater than or equal to a threshold as mined characteristic data.

First claim

1 . An apparatus for mining battery characteristic data having sensitivity to an active material volume fraction of a battery electrode, comprising:
a storage unit configured to store data; a voltage measuring unit, a current measuring unit and a temperature measuring unit respectively configured to measure voltage, current, and temperature of a battery; and a control unit operably coupled to the storage unit as well as the voltage measuring unit, the current measuring unit and the temperature measuring unit, wherein the control unit is configured to execute control logics to: generate a Pade approximation equation for a transcendental transfer function from a battery current to a particle surface concentration of lithium inserted into the electrode in a frequency domain; generate a first state space model for the Pade approximation equation and a second state space model for partial derivative of an active material volume fraction of the electrode with respect to the Pade approximation equation; obtain a data stream including a voltage measurement value, a current measurement value and a temperature measurement value of the battery; calculate a change ratio of over-potential to the change in the active material volume fraction by inputting the current measurement value and the temperature measurement value to the partial derivative of the active material volume fraction for an over-potential equation derived from the Butler-Vollmer equation; input the current measurement value into the first state space model to calculate the particle surface concentration of lithium inserted into the electrode; input the current measurement value into the second state space model to calculate a change ratio of the particle surface concentration to the change in the active material volume fraction; calculate an open circuit potential slope corresponding to the calculated particle surface concentration by using a predefined open circuit potential function according to the particle surface concentration; quantitatively estimate the sensitivity of a battery voltage for the active material volume fraction of the electrode from the change ratio of the over-potential to the change in the active material volume fraction, the open circuit potential slope, and the change ratio of the particle surface concentration to the change in the active material volume fraction; and select voltage-current data having sensitivity greater than or equal to a threshold and recording the same as mined characteristic data in the storage unit.

2 . The apparatus for mining battery characteristic data having sensitivity to an active material volume fraction of a battery electrode according to claim 1 ,
wherein the control unit is configured to generate the transcendental transfer function expressed by the following equation:

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Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Geum-Bee
• Lai Qingzhi
• Lin Xinfan
• Ahn Hyoung Jun
• Joe Won-Tae

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/971

  the charge cycle being controlled or terminated in response to non-electric parameters · CPC title

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/40

  characterised by the exchange of charge or discharge related data · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title