Method and apparatus for calculating state of charge upon battery and battery pack

A technology of remaining power and battery charging, which is applied in battery circuit devices, measuring devices, circuit devices, etc., can solve the problems of battery power not being fully charged, remaining power jumping, and large errors, so as to achieve accurate current remaining power and improve accuracy. Effect
CN106291390AActive Publication Date: 2017-01-04CONTEMPORARY AMPEREX RUNZHI SOFTWARE TECH LTD NINGDE CITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX RUNZHI SOFTWARE TECH LTD NINGDE CITY
Publication Date
2017-01-04

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Abstract

The invention discloses a method and apparatus for calculating the state of charge upon charging and a battery pack, and relates to the field of batteries, battery management systems and electric vehicles, aiming at increasing the accuracy of calculating the state of charge upon charging a battery. The method comprises the following steps: acquiring the fully-charged cut-off voltage of a to-be-measured battery and any one charging voltage curve; acquiring a preset reference voltage in the approximately linear rising stage of the charging voltage curve, and acquiring a corresponding reference state of charge; acquiring the current charging voltage in the approximately linear rising stage of the charging voltage curve of the to-be-measured battery; based on the preset reference voltage, the fully-charged cut-off voltage and the current charging voltage, determining a compensation coefficient; using the compensation coefficient and the reference state of charge to calculate the current state of charge under current charging state of the to-be-measured battery, and the compensation coefficient converting the voltage difference between the current charging voltage and the preset reference voltage to the difference of state of charge between the current state of charge and the reference state of charge.
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Description

Technical field

[0001] The present invention relates to the fields of batteries, battery management and electric vehicles, and in particular to a method, device and battery pack for calculating the remaining power during battery charging. Background technique

[0002] With the development of industrial technology, batteries are also used as power sources in more and more fields. SOC (State of Charge, also known as remaining power) refers to the ratio of the remaining power of the battery to the rated capacity under the same conditions under a certain discharge rate. The battery management system will calculate the remaining power of the battery, and the user can see It is the calculated remaining power displayed, which enables the user to know the charging progress of the battery by viewing the remaining power displayed when charging the battery.

[0003] At present, the ampere-hour method or the open circuit voltage method is generally used to calculate the remaining power, but b...

Claims

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