High-precision synchronous acquisition system and method for current of monomers in parallel battery packs
A power battery pack, high-precision synchronization technology, applied in the direction of measuring electricity, electric vehicles, electric traction, etc., can solve the problems of difficult selection of precision resistors, data asynchronous, vulnerable to external interference, etc., to achieve high-speed battery data acquisition, reduce Small sampling error and good scalability
Active Publication Date: 2018-12-25
SHANDONG UNIV
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Problems solved by technology
For the current detection method using resistors combined with operational amplifiers, its advantages are low cost, high precision, and small size, but it has the disadvantages of large temperature drift, difficult selection of precision resistors, and no isolation effect; for the detection method using current transformers, Often, the large current on the primary side is converted proportionally and sent to instruments or relays, which is not suitable for direct detection of small currents.
The detection method using the Hall current sensor is mostly used for small current detection, and the input (current) and output (voltage) satisfy a linear relationship. This method has a simple structure, but is susceptible to external interference. Asynchronous, poor detection stability of Hall current sensor
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[0034] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0035] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0036] In a typical implementation example of the present application, such as figure 1 As shown, a high-precis...
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The invention discloses a high-precision synchronous acquisition system and method for parallel battery pack monomer current. The system comprises a current acquisition module, a voltage modulation module and a control unit, wherein the current acquisition module, the voltage modulation module and the control unit are arranged in current acquisition channels; the current acquisition module is usedfor acquiring current of battery monomers in parallel battery packs, converting current signals into single-end voltage signals and converting the single-end voltage signals into differential signals; the voltage modulation module is used for carrying out voltage following on the differential signals output by the current acquisition module, modulating the differential signals to ensure that thedifferential signals satisfy signals required by input of analog-digital conversion, and transmitting the modulated signal to the control unit through the analog-digital conversion; and the control unit is used for sending synchronization signals to a plurality of current acquisition channels at the same time and controlling the synchronous acquisition of current of battery monomers in the plurality of current acquisition channels. According to the system and method, the stability of data measured by hall current sensors is improved through circuit design.
Description
technical field [0001] The invention relates to the technical field of battery pack monomer current acquisition, in particular to a system and method for high-precision synchronous acquisition of parallel power battery pack monomer current. Background technique [0002] Batteries are not only the energy source of electric vehicles, but also the core of new energy storage links. When the battery is in use, it must be combined in series and parallel to form a battery pack to meet the voltage and current requirements. [0003] During the research, the inventor found that the existing battery management system (BMS) rarely has a battery management system for parallel battery packs, and there are many problems in the detection method of the single current of the parallel power battery packs. In fact, due to the inconsistency of the battery cells, there are obvious differences in their internal resistance, etc., so that the currents of the parallel cells are different when they a...
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Login to View More IPC IPC(8): G01R19/25G01R31/36B60L11/18
CPCG01R19/25G01R31/3648Y02T10/70
Inventor 张承慧王立康段彬张明瑞王楠
Owner SHANDONG UNIV