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Battery monomer voltage measuring circuit and compensation method for measuring error thereof

A technology for measuring circuit and monolithic voltage, applied in the direction of measuring electric variable, measuring electricity, voltage/current isolation, etc., can solve the problems of high cost, low accuracy of voltage measurement, difficulty in large-scale promotion and application, etc., to meet the requirements of The need for installation space restrictions, the effect of solving electromagnetic compatibility and high voltage insulation problems

Inactive Publication Date: 2010-11-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the above reasons, single-chip voltage measurement circuits often have disadvantages such as large volume, high cost, low accuracy of voltage measurement, and a small number of measurement channels, making it difficult to promote and apply them on a large scale.

Method used

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  • Battery monomer voltage measuring circuit and compensation method for measuring error thereof
  • Battery monomer voltage measuring circuit and compensation method for measuring error thereof
  • Battery monomer voltage measuring circuit and compensation method for measuring error thereof

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment the present invention is further described

[0019] (1) Circuit and principle

[0020] figure 1 Each battery box 101 is equipped with a set of this circuit 102. When there are multiple battery boxes, each measurement circuit can communicate with the main controller of the battery management system through the CAN bus, and the measured The battery voltage is sent to the main controller.

[0021] figure 2 It is a structural diagram of a battery single-chip voltage measurement circuit, including a high-voltage gating circuit 201 for gating a single-chip battery, a high common-mode measurement circuit 202, an isolation amplifier 203, an absolute value output circuit 204, a single-chip circuit 205, a communication circuit 206 and an isolation DCDC power supply 207 . The isolated power supply outputs the 5V power supply required by the microcontroller, and the ±15V power supply required by the common-mode diff...

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Abstract

The invention relates to a battery monomer voltage measuring circuit and a compensation method for measuring error thereof, and belongs to the technical field of power of electromobiles. The circuit comprises a high voltage gating circuit, a high common-mode measuring circuit, an isolation amplifying circuit, an absolute value circuit, a singlechip digital core circuit, a communication circuit and a power circuit. The compensation method for measuring error comprises the following steps: analyzing the measuring error, and obtaining a modifier formula for the monomer voltage measurement. Aiming at the characteristics of a great number of voltage monomers, gradual accumulated potential and high absolute potential in the battery, the high-voltage part and the lower-voltage part are separately arranged, thereby solving the problems of electromagnetic compatibility and high-voltage insulation in the high-density multichannel monomer voltage measurement. The monomer voltage measuring circuit has the advantages of high precision, high reliability, small size and low measurement cost per monomer. The error correction method can be used for acquiring high-precision battery voltage measurement results (the error is less than 10 mV), and is applicable to monomer voltage on-line precision measurement of power batteries for electromobiles.

Description

technical field [0001] The invention relates to a battery monolithic voltage measurement circuit, in particular to an accurate measurement circuit for a monolithic voltage of a vehicle battery pack and a measurement error compensation method thereof, belonging to the technical field of electric vehicle power. Background technique [0002] The power battery provides power energy for electric vehicles, and generally consists of multiple single batteries of the same specification connected in series. Due to the dispersion of the performance of the single battery in the manufacturing process and the non-uniformity of the internal environment of the battery pack during use, the performance difference between the single batteries will gradually increase with the increase of the use time, making the battery The state of health (SOH) declines, and only when these problematic battery cells are discovered in time can they be balanced and repaired. At the same time, in order to accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/22G01R31/36
Inventor 郑岳久李建秋李相俊韩雪冰卢兰光欧阳明高
Owner TSINGHUA UNIV
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