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Circuit and method for measuring internal resistance of single battery in power battery box

A battery cell and measuring circuit technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of inability to measure battery, lack of single battery resistance measurement function, increase time and cost, and achieve low power consumption. , The effect of simple measurement and improved accuracy

Inactive Publication Date: 2020-03-17
芜湖天量电池系统有限公司
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Problems solved by technology

[0003] At present, the BMS on the market mainly monitors the battery data including the total voltage of the battery box, the total current, the voltage of the single battery, the temperature of the battery box, and the insulation detection between the battery box and the car, but it lacks the measurement function of the resistance of the single battery.
For the resistance measurement of the power lithium battery, at present, it is mainly measured manually using a dedicated battery resistance measuring instrument. This method cannot measure the battery in the car and must be unpacked, which leads to the actual operation of measuring the battery resistance. The increase in time and cost is something that car companies and consumers do not want to see, so it is particularly important to add the automatic measurement function of battery resistance to BMS

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  • Circuit and method for measuring internal resistance of single battery in power battery box
  • Circuit and method for measuring internal resistance of single battery in power battery box
  • Circuit and method for measuring internal resistance of single battery in power battery box

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Embodiment Construction

[0029] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.

[0030] There are three main methods of measuring battery internal resistance: open circuit voltage method, DC discharge method and AC impedance method:

[0031] 1. The open-circuit voltage method is an internal resistance measurement method that estimates the internal resistance of the battery by measuring the open-circuit terminal voltage of the battery. However, because the battery terminal voltage changes during the charging and discharging process, the internal resistance cannot be accurately measured.

[0032] 2. The DC discharge method is to pass a large DC current through the battery in a short period of time, measure the voltage at both ends of the battery, and calculate the current internal resistance of the battery according to Ohm's law, but it can only be measured statically, whi...

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Abstract

The invention discloses a circuit for measuring the internal resistance of a single battery in a power battery box. The measurement circuit comprises an AC excitation circuit, an AC voltage sampling circuit and a main control circuit. The AC excitation circuit inputs alternating-current excitation to the single battery; the AC voltage sampling circuit is used for detecting an alternating-current voltage response signal of the single battery under the action of alternating-current excitation; the output end of the AC voltage sampling circuit is connected with the main control circuit; and the main control circuit calculates resistance data of the single battery according to alternating-current excitation current and collected alternating-current voltage. According to the invention, the internal resistance data of each single battery in the battery box can be automatically detected, and data support is provided for the work of a battery management system; the circuit for measuring the internal resistance of the single battery is simple and reliable in structure and less in hardware improvement, and can be conveniently integrated in the battery management system or the battery box soas to facilitate realization of online detection.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a circuit for measuring the internal resistance of battery cells in a power battery box. Background technique [0002] In new energy vehicles, BMS, as an important component, mainly monitors the state parameters of the power battery, and provides charge and discharge management control, battery maintenance and external communication functions according to the requirements of the vehicle. [0003] At present, the BMS on the market mainly monitors the battery data including the total voltage of the battery box, the total current, the voltage of the single battery, the temperature of the battery box, and the insulation detection between the battery box and the car, but lacks the function of measuring the resistance of the single battery. For the resistance measurement of the power lithium battery, at present, it is mainly measured manually using a dedicated battery resistance measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389G01R31/396
CPCG01R31/389G01R31/396
Inventor 黄海罗国平鲁春崔亚平王超
Owner 芜湖天量电池系统有限公司
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