Voltage automatic calibration device

An automatic calibration and voltage calibration technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of discrete differences in battery voltage, cumbersome steps, and dependence on manual operations, so as to overcome fluctuations and discrete differences and improve voltage sampling accuracy , to avoid the effect of human error

Inactive Publication Date: 2012-07-11
力高(山东)新能源技术股份有限公司
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Problems solved by technology

This method is overly dependent on manual operation, and the steps are cumbersome, which restricts the mass production of voltage acquisition modules. At the same time, there are discrete differences in battery voltage and the possibility of final calibration value errors due to manual measurement and calculation negligence, which cannot truly guarantee the accuracy of the voltage acquisition module. Acquisition Accuracy

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Embodiment Construction

[0015] See figure 1 , A voltage automatic calibration device, including a high-precision voltage reference source, a multi-channel switching relay, a voltage acquisition module and a single-chip control unit. The high-precision voltage reference source is composed of a 2.5V voltage stabilizer chip and its peripheral circuits. The nominal accuracy of the output voltage of the reference source is 1mV, and it has a temperature compensation function. In addition, the voltage drift within 5°C is negligible. One end of each channel switching relay is connected to a high-precision voltage reference source, and each channel switching relay The other end is connected to each voltage acquisition channel of the voltage acquisition module. The single-chip control unit is connected to the control end of each channel switching relay. The single-chip control unit controls the switching of the multi-channel switching relay. The single-chip control unit collects the voltage through the CAN bus. ...

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Abstract

The invention discloses a voltage automatic calibration device, which includes a high precision voltage reference source, multichannel transfer relays, a voltage acquisition module and a single chip control unit, wherein one end of each of the channel transfer relays is respectively connected with the high precision voltage reference source, the other end of each of the channel transfer relays is connected with each of voltage acquisition channels of the voltage acquisition module respectively, the single chip control unit is connected with a control end of each of the channel transfer relays and is connected with the voltage acquisition module through a controller area network (CAN) bus, thereby obtaining channel acquisition voltage of the voltage acquisition module and finishing the calculation of voltage calibration value. The single chip control unit performs voltage calibration on the voltage acquisition module through the CAN bus. Without manual operation, the voltage automatic calibration device avoids battery voltage discretization errors and personal errors, and can guarantee that voltage acquisition precision is promoted from 10 m V to 2 m V.

Description

Technical field [0001] The invention relates to the technical field of battery management systems (BMS), in particular to a voltage automatic calibration device of a battery management system (BMS). Background technique [0002] The battery management system (BMS) voltage acquisition module needs to collect and monitor the voltages of hundreds of cells in real time. The accuracy of cell voltage collection directly determines the real-time and effectiveness of the BMS for battery protection. At present, the integrated chip acquisition scheme and the discrete component acquisition scheme adopted in the industry both have voltage imbalance due to inherent inconsistencies of the circuit, which ultimately leads to large deviations in voltage acquisition. The voltage acquisition function of the voltage acquisition module needs to be calibrated before leaving the factory. [0003] The traditional calibration method is as follows: connect the collection cable of the voltage acquisitio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 姚高亮王立田刘新天严春早
Owner 力高(山东)新能源技术股份有限公司
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