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Method and system for assessing a state of charge/discharge (soc/sod) for an electrochemical cell

A state of discharge, state of charge technology, applied in the system field

Pending Publication Date: 2020-09-15
雅扎米IP私人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] SOC=α+βΔS+γΔH

Method used

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  • Method and system for assessing a state of charge/discharge (soc/sod) for an electrochemical cell
  • Method and system for assessing a state of charge/discharge (soc/sod) for an electrochemical cell
  • Method and system for assessing a state of charge/discharge (soc/sod) for an electrochemical cell

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Embodiment Construction

[0120] The SOC / SOD evaluation method according to the present invention is based on thermodynamics. Entropy (ΔS) and enthalpy (ΔH) were measured during battery operation (charging and discharging) and during rest (no current). General rules for establishing SOC as a function of entropy and enthalpy:

[0121] SOC=α+βΔS+γΔH (Formula 1)

[0122] This rule applies to both primary and secondary batteries. In this Equation 1, the parameters α, β and γ depend on the chemistry of the battery and the state of health (SOH) of the battery.

[0123] Thermodynamic data can be used to determine the SOD of primary (aqueous lithium and organolithium) cells and rechargeable (lithium-ion, NiMH, NiCd, NaS, ...) cells with very high accuracy (>97%).

[0124]Due to the IC / chip with highly sensitive temperature (≤0.1°C) probe and voltage (≤0.1mV) probe, SOD evaluation can be performed online.

[0125] Two different SOCs cannot have the same entropy and enthalpy at the same time. This follows t...

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Abstract

A method for assessing a state of charge / discharge (SOC / SOD) for a secondary electrochemical cell is provided, said cell having a first operational mode during which said cell is charged from a powersupply connected to terminals of said cell, a second operational mode during which said cell is discharged into a load and a rest mode, said method comprising steps of measuring entropy and enthalpy for said electrochemical cell, in the course of said first and second operational modes and during rest, and calculating a data representative of said state of charge / discharge (SOC / SOD).

Description

technical field [0001] The present invention relates to a method for evaluating the state of charge (SOC) / state of discharge (SOD) of an electrochemical cell. The invention also relates to systems. Background technique [0002] A battery's state-of-charge (SOC) is an important factor for battery users to understand the remaining unused capacity and predict the battery's end-of-service under a specific discharge load. [0003] SOC should be accurately determined in both primary (non-rechargeable) and secondary (rechargeable) batteries. Currently, the main SOC determination methods are based on: [0004] - Coulomb calculation using the following formula: [0005] in, [0006] During the discharge of primary and secondary batteries, the sign of ± is (-), and, [0007] During the charging of the secondary battery, the sign of ± is (﹢), [0008] and, [0009] i(τ) = discharge current and charge current, [0010] and τ = time; [0011] - Kalman Filter (KF) and Extended ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00G01R31/382H01M50/569
CPCH01M10/425H01M10/4257H01M10/44H01M10/48H01M10/486H01M2010/4271H01M2010/4278H02J7/0048Y02E60/10H02J7/005H01M50/569G01R31/392G01R31/3842
Inventor R·雅扎米
Owner 雅扎米IP私人有限公司