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Method of estimation of the state of charge of a lead-acid battery

一种铅酸蓄电池、充电状态的技术，应用在二次电池、电池组零部件、测量电流/电压等方向，能够解决环境危害、参考电极差长期稳定性、电极昂贵等问题

Inactive Publication Date: 2010-09-01
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

PbO 2 / PbSO 4 The poor long-term stability of the reference electrode makes it almost unsuitable for permanent use in lead-acid batteries, while Hg / Hg 2 SO 4 Electrodes are expensive and cause environmental hazards

Method used

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  • Method of estimation of the state of charge of a lead-acid battery
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  • Method of estimation of the state of charge of a lead-acid battery

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Embodiment Construction

[0028] The SOC estimation method according to the present invention uses the correlation that exists between SOC and the open circuit negative plate voltage V- (i.e. the open circuit voltage difference between the negative plate and a reference electrode with a liquid junction, such as Ag / Ag 2 SO 4 , Hg / Hg 2 SO 4 or Cu / CuSO 4 Reference electrode.

[0029] Negative plate voltage V- corresponds to Pb / PbSO 4 Negative electrode and Ag / Ag 2 SO 4 or Hg / Hg 2 SO 4 The potential difference ΔE between the reference electrodes, which is given by the following equation:

[0030] ΔE=ΔE 0 +(RT / 2F)(2t + -l)(lna HSO4- cell -lan HSO4- RE ) = ΔE 0 +Ej (4)

[0031] Among them, t + is H + Migration number, a HSO4- cell and a HSO4- RE HSO4 in lead-acid battery and reference electrode respectively - Chemical activity, ΔE 0is the difference between the standard electrochemical potentials of the negative electrode and the reference electrode, and Ej is the junction potential, ...

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Abstract

The method of estimation of the state of charge of a lead acid battery comprises measuring the open circuit voltage difference (V-) between an integrated liquid junction reference electrode and a negative battery terminal during at least one cut-off period. It further comprises determination of the sign of the current though the battery prior to cut-off and estimation of the state of charge on the basis of the open circuit voltage difference and, according to the sign of the current, respectively of a charge (C1, C2) or a discharge (D1, D2) calibration curve, previously determined during a calibration procedure. The cut-off period has preferably a duration of at least 5min.

Description

technical field [0001] The present invention relates to a method of estimating the state of charge of a lead-acid battery comprising an integrated liquid junction reference electrode, the method comprising: at least one cut-off During the period, the open circuit voltage difference between the reference electrode and the negative battery terminal is measured. Background technique [0002] The state of charge (SOC) of a battery generally refers to the electrochemical capacity of the battery (in Ah or as a percentage of a reference capacity value) that can be obtained by discharging under predetermined conditions regarding discharge current, temperature, voltage limits, etc. . Estimation and indication of SOC is an important requirement in every system that uses electrochemical storage of energy. The state of health (SOH) of a battery refers to the irreversible loss of capacity of the battery due to different degradation phenomena. Usually, it is presented as a ratio betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48H01M50/569
CPCY02E60/12G01R31/3668G01R19/16542H01M10/48G01R31/3679G01R31/392G01R31/379Y02E60/10H01M50/569G01R31/3842H02J7/0048H01M10/06
Inventor 安杰尔·Z·柯切夫
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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