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Battery state-of-health measuring method

A technology of battery health status and single battery, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as inaccurate measurement methods, and achieve the effect of ensuring measurement accuracy

Active Publication Date: 2017-04-26
ZHENGZHOU YUTONG BUS CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring and calculating the state of health of a battery to solve the problem of inaccurate measuring and calculating methods in the prior art

Method used

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] For electric vehicles, select the single battery with the lowest voltage in the battery pack and perform the following steps:

[0018] The method for measuring and calculating the battery health status is as follows: 1) record the storage time t of the single battery in the unused state, and record the voltage V and temperature T data of the single battery in real time; Voltage V, current I and temperature T data.

[0019] 2) According to the relationship function SOC=f(V, I, T, t) between SOC and current, temperature, voltage, and lay-up time, calculate the SOC at the corresponding time, so as to obtain the SOC difference △SOC between the two times;

[0020] 3) Use the formula SOH=(1-a*△SOC b )*100% real-time calculation of SOH.

[0021] Specifically, firstly, the calculation frequency and accuracy can be adjusted by setting the value of Δt, where ...

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Abstract

The invention provides a battery state-of-health measuring method. The method comprises the steps of (1) recording the laying aside time t of a single battery in a unused state, and recording the voltage V and temperature T data of the single battery in real time, (2) calculating the SOC of a corresponding time of the battery in a working or laying aside state according to a relation function SOC=f(V, I, T, t) between SOC and current, the temperature, the voltage and the laying aside time, and thus obtaining the SOC difference Delta SOC between two times, and (3) calculating SOH in real time by using a formula SOH=(1-a*Delta SOCb)*100%. According to the method, the battery SOH can be accurately calculated based on the change amount of the SOC, and the influence of a battery system calendar life on the SOH can be reflected.

Description

technical field [0001] The invention relates to a battery health state measurement method. Background technique [0002] Electric vehicles are attracting more and more attention because they meet the needs of air pollution control, meet the development direction of new energy vehicles, meet the needs of technological development, and meet the needs of the market. At present, the on-board energy system of electric vehicles is composed of multiple lithium-ion batteries connected in series and parallel. After a period of operation, the composed system will experience different degrees of energy attenuation. Due to the inconsistency of the monomers, the attenuation of the battery system produced by different manufacturers is different. Therefore, an accurate evaluation of the state of health (SOH) of the battery system is of great significance for the driver to understand the service life of the battery system and to replace the problematic single cells in time when problems oc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/392G01R31/396
Inventor 秦学周雪松周时国
Owner ZHENGZHOU YUTONG BUS CO LTD
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