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Method for measuring state of charge of battery

A battery state of charge and measurement method technology, applied in the direction of measuring electricity, electrical devices, measuring devices, etc., can solve the problem of inaccurate determination of electric vehicles and hybrid vehicles

Inactive Publication Date: 2009-02-04
BYD CO LTD
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing methods for measuring the SOC value of electric vehicles and hybrid vehicles are not accurate enough, and provide a method based on the modified ampere-hour integral algorithm that can more accurately measure the SOC value

Method used

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  • Method for measuring state of charge of battery
  • Method for measuring state of charge of battery
  • Method for measuring state of charge of battery

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Embodiment Construction

[0014] The method for determining the SOC value of the battery provided by the present invention includes using the corrected ampere-hour integral method SOC ( t ) = C 0 - ∫ 0 t i ( τ ) dτ C n + Φ ( t ) Measure the SOC value of the battery state of charge at time t, where C 0 is the initial charge of the battery, C n is the rated capacity of the battery, Φ (t) is a correction function, and i (τ) is a function of current i changing with time τ, and the measurement method of the correction function Φ (t) includes the following steps:

[0015] a)...

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Abstract

A method for determining the battery state of charge SOC adopts corrected ampere hour integration method (Figure) to determine the battery state of charge SOC value at the time of t; the measurement method of the correction function fai (t) comprises the following steps: an SOC theoretical value calculated formula is adopted to calculate the battery state of charge SOC theoretical values SOC(theoretical) at a plurality of times; and the battery state of charge SOC actual values SOC(actual) at the plurality of times are measured; through the least square method, the correction function fai (t) standing for the relation between the difference value between the SOC(theoretical) and the SOC(actual), and the plurality of times; wherein, the SOC theoretical value calculation formula in step (a) adopts the basic ampere hour integration method (see the above formula); and x stands for one of the plurality of times. The application of the method can obtain accurate correction functions so as to achieve more precise battery state of charge SOC values to give full play to the battery performance and ensure the safety of the complete vehicle systems.

Description

technical field [0001] The invention relates to a method for measuring the state of charge of a battery. Background technique [0002] As the main or auxiliary power source of electric vehicles and hybrid vehicles, the battery pack is a key component of electric vehicles and hybrid vehicles. How to use the battery reasonably, make full use of the energy in the battery, and prolong the service life of the battery are the problems that must be solved for the further development of electric vehicles and hybrid vehicles. [0003] The battery state of charge SOC (State Of Charge) is used to describe the remaining power of the battery and is an important parameter during the use of the battery. It is not only related to the estimation of the mileage of the car, but also related to the safety of the power battery. When the car is running, the large current may cause the battery to be overcharged or deeply discharged. Therefore, it is necessary to monitor the SOC state of the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36B60L3/00
Inventor 张健
Owner BYD CO LTD
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