CN115980598A - Power battery multichannel synchronous detection board - Google Patents
Power battery multichannel synchronous detection board Download PDFInfo
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- CN115980598A CN115980598A CN202211674904.3A CN202211674904A CN115980598A CN 115980598 A CN115980598 A CN 115980598A CN 202211674904 A CN202211674904 A CN 202211674904A CN 115980598 A CN115980598 A CN 115980598A
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Abstract
The invention relates to the technical field of battery performance measurement, in particular to a power battery multi-channel synchronous detection board; the detection board comprises a battery end connector, a plurality of independent measurement channels, an FPGA processing unit, a single chip microcomputer, a communication interface circuit and a power supply, wherein each measurement channel comprises a signal conditioning circuit, a high-speed analog-to-digital converter and a high-speed communication isolation interface chip; the detection board designed by the scheme can synchronously measure the voltage, the current, the temperature, the charge and discharge amount and other information of the power battery at high speed in parallel when being applied to the performance test of the power battery, and can carry out flexible and various system configurations according to the measurement requirements.
Description
Technical Field
The invention relates to the technical field of battery performance measurement, in particular to a multi-channel synchronous detection board for a power battery.
Background
Lithium ion batteries are widely used in energy storage systems of electric vehicles, and demands for scientific research and performance detection of lithium ion batteries are increasing, and in practical applications based on these demands, a charge and discharge tester is generally used to perform charge and discharge cycles on the batteries, parameters such as voltage and current of the batteries are measured in the cycle process, and then the measured data are analyzed and processed by a specific analysis means, so as to grasp the characteristics of the batteries.
For a battery pack formed by connecting battery cells in series, the existing detection devices measure the voltage of the battery cells in a polling mode, and the obtained measurement results are results which do not belong to the same time point, so that errors are generated in the data processing stage. Under the condition that the change rate of the battery voltage is large, the error is increased, and the detection accuracy is seriously influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the power battery multi-channel synchronous detection board which can synchronously measure the voltage, the current, the temperature, the charge and discharge amount and other information of the power battery at a high speed so as to eliminate data processing errors caused by asynchronous measured data time.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the power battery multichannel synchronous detection board is connected with a power battery monomer, the power battery monomer is connected with a current sensor and a temperature sensor, and the detection board comprises a battery end connector, a plurality of independent measurement channels, an FPGA processing unit, a single chip microcomputer, a communication interface circuit and a power supply;
the power supply is used for providing power for the detection process;
the communication interface circuit comprises an Ethernet interface, a CAN communication interface and a master-slave synchronous interface;
the battery end connector is connected with the measuring channel, the measuring channel is connected with the FPGA processing unit, the FPGA processing unit is simultaneously connected with the single chip microcomputer and the master-slave synchronous interface, and the single chip microcomputer is respectively connected with the CAN communication interface and the Ethernet interface;
the battery end connector is respectively connected with the power battery monomer, the current sensor and the temperature sensor;
the measurement channel comprises a signal conditioning circuit, a high-speed analog-to-digital converter and a high-speed communication isolation interface chip, the signal conditioning circuit is connected with the battery end connector and the high-speed analog-to-digital converter at the same time, the high-speed analog-to-digital converter is connected with the high-speed communication isolation interface chip, and the high-speed communication isolation interface chip is connected with the FPGA processing unit.
In the technical scheme, a multichannel synchronous detection plate structure is designed, wherein a battery end connector can connect voltage information, current information and temperature information of a power battery monomer into a measurement channel of the multichannel synchronous detection plate of the power battery to measure, a signal conditioning circuit is arranged for measurement signals of each battery monomer, the conditioned signals can select 16-bit or 24-bit ADC chips with different resolutions according to the expected measurement precision through a high-speed analog-to-digital converter (ADC), each ADC chip is connected with an FPGA processing unit through a serial data bus, and a high-speed communication isolation interface chip is adopted for isolation.
Based on the parallel processing capability of the FPGA, each ADC can strictly keep synchronous sampling, and output result data are synchronously transmitted to the FPGA processing unit, so that the time synchronization of the measured data is ensured. After the FPGA processing unit obtains the original measurement result, the FPGA processing unit performs calibration calculation on each path of measurement result in parallel to obtain a final result. The final result is sent to the single chip, and the single chip transmits to the outside at high speed through the Ethernet interface.
Further, the signal conditioning circuit comprises a low-pass filter, a precise voltage-dividing resistor network and an emitter follower;
the signal conditioning circuit filters high-frequency noise of an accessed analog signal through a low-pass filter, the emitter follower improves input impedance of a measuring channel and performs voltage division processing to obtain an input signal of a high-speed analog-to-digital converter, the high-speed analog-to-digital converter converts the analog signal processed by the signal conditioning circuit into a digital signal, and the high-speed communication isolation interface chip electrically isolates the measuring channel.
Furthermore, the FPGA processing unit controls the high-speed analog-to-digital converter in the measurement channel to synchronously start sampling, reads the output result of the high-speed analog-to-digital converter to synchronously execute calibration calculation, and transmits the obtained final measurement result to the single chip microcomputer in a DMA mode, so that strict synchronism of measurement data is realized.
Further, the single chip microcomputer reads the measurement result and sends the measurement result to the PC or the remote server through the Ethernet interface.
Further, the single chip microcomputer transmits a control instruction and key battery information to the charge and discharge tester through the CAN communication interface.
Furthermore, the detection board is provided with a plurality of detection boards, one detection board is used as a main detection board, works in a master mode and sends out synchronous pulse signals, the other detection boards are used as slave detection boards, works in a slave mode and keeps synchronous with the main detection board, and the main detection board is connected with the slave detection boards through a master-slave synchronous interface, so that all the measurement channels can be guaranteed to finish one-time sampling at the same time.
Compared with the prior art, the scheme has the remarkable advantages that:
the detection board designed by the scheme can synchronously measure the voltage, the current, the temperature, the charge and discharge amount and other information of the power battery at high speed in parallel when being applied to the performance test of the power battery, and can carry out flexible and various system configurations according to the measurement requirements.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a measurement process in an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustration and explanation, and are not intended to limit the present invention.
As shown in fig. 1, the multi-channel synchronous detection board for power batteries according to the present invention is connected with a power battery cell to be measured, and the power battery cell is connected with a current sensor and a temperature sensor.
The detection board comprises a battery end connector, a plurality of independent measurement channels, an FPGA processing unit, a single chip microcomputer, a communication interface circuit and a power supply.
Wherein, power supply provides the power for the work of whole pick-up plate. The communication interface circuit comprises an Ethernet interface, a CAN communication interface and a master-slave synchronous interface. The battery end connector is connected with the measuring channel, the measuring channel is connected with the FPGA processing unit, the FPGA processing unit is respectively connected with the single chip microcomputer and the master-slave synchronous interface, and the single chip microcomputer is simultaneously connected with the CAN communication interface and the Ethernet interface.
In application, the battery end connector is connected with the power battery monomer, the current sensor and the temperature sensor and is used for connecting voltage information, current information and temperature information of the power battery monomer into a measurement channel of the multi-channel synchronous detection board of the power battery.
In the embodiment, a plurality of power battery multi-channel synchronous detection plates are adopted to expand the number of measurement channels, one of the power battery multi-channel synchronous detection plates is a main detection plate and works in a host mode to send out synchronous pulse signals, the other detection plates are slave detection plates and work in a slave mode to keep synchronous with the main detection plate so as to ensure that all the measurement channels complete one-time sampling at the same time, and the main detection plate is connected with the slave detection plates through a master-slave synchronous interface.
Each measuring channel comprises a signal conditioning circuit, a high-speed analog-to-digital converter and a high-speed channel isolation interface chip, wherein one end of the signal conditioning circuit is connected with the battery end connector, the other end of the signal conditioning circuit is connected with the high-speed analog-to-digital converter, the high-speed analog-to-digital converter is connected with the high-speed communication isolation interface chip, and the high-speed communication isolation interface chip is connected with the FPGA processing unit.
Further, the signal conditioning circuit comprises a low-pass filter, a precise voltage division resistor network and an emitter follower, and specifically, the signal conditioning circuit is used for filtering high-frequency noise of an interposed analog signal through the low-pass filter, improving input impedance of a measurement channel through the emitter follower, and then performing voltage division processing to obtain an input signal required by the high-speed analog-to-digital converter.
The high-speed analog-to-digital converter is used for converting analog signals processed by the signal conditioning circuit into digital signals, and the high-speed communication isolation interface chip is used for electrically isolating the measurement channel.
In addition, the FPGA processing unit is used for controlling synchronous starting sampling of the high-speed analog-to-digital converters in each measuring channel, synchronously reading the output result of each high-speed analog-to-digital converter by using the parallel processing capacity of the FPGA, synchronously executing calibration calculation to obtain a final measuring result, and finally transmitting the final measuring result to the single chip microcomputer in a DMA mode.
The singlechip is used for reading the measurement result and sending the measurement result to the PC or the remote server through the Ethernet interface. The single chip microcomputer is also used for transmitting control instructions and key battery information to the charge and discharge tester through the CAN communication interface.
In the technical scheme, a multi-channel synchronous detection plate structure is designed, wherein a battery end connector can connect voltage information, current information and temperature information of a power battery monomer into a measurement channel of the multi-channel synchronous detection plate of the power battery to measure, a signal conditioning circuit is arranged for measurement signals of each battery monomer, ADC chips with different resolutions of 16 bits, 24 bits and the like can be selected according to expected measurement precision through a high-speed analog-to-digital converter (ADC) after conditioning signals, each ADC chip is connected with an FPGA processing unit through a serial data bus, and high-speed communication isolation interface chips are adopted for isolation.
Based on the parallel processing capability of the FPGA, each ADC can strictly keep synchronous sampling, and output result data are synchronously transmitted to the FPGA processing unit, so that the time synchronization of the measured data is ensured. And after the FPGA processing unit obtains the original measurement result, the FPGA processing unit performs calibration calculation on each path of measurement result in parallel to obtain a final result. The final result is sent to the single chip, and the single chip transmits to the outside at high speed through the Ethernet interface.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A multi-channel synchronous detection board for a power battery is connected with a power battery monomer, and the power battery monomer is connected with a current sensor and a temperature sensor and is characterized by comprising a battery end connector, a plurality of independent measurement channels, an FPGA processing unit, a single chip microcomputer, a communication interface circuit and a power supply;
the power supply is used for providing power for the detection process;
the communication interface circuit comprises an Ethernet interface, a CAN communication interface and a master-slave synchronous interface;
the battery end connector is connected with the measuring channel, the measuring channel is connected with the FPGA processing unit, the FPGA processing unit is simultaneously connected with the single chip microcomputer and the master-slave synchronous interface, and the single chip microcomputer is respectively connected with the CAN communication interface and the Ethernet interface;
the battery end connector is respectively connected with the power battery monomer, the current sensor and the temperature sensor;
the measurement channel comprises a signal conditioning circuit, a high-speed analog-to-digital converter and a high-speed communication isolation interface chip, the signal conditioning circuit is connected with the battery end connector and the high-speed analog-to-digital converter at the same time, the high-speed analog-to-digital converter is connected with the high-speed communication isolation interface chip, and the high-speed communication isolation interface chip is connected with the FPGA processing unit.
2. The multi-channel synchronous detection plate for the power batteries as claimed in claim 1, wherein the signal conditioning circuit comprises a low-pass filter, a precise voltage-dividing resistor network and an emitter follower;
the signal conditioning circuit filters high-frequency noise of an accessed analog signal through the low-pass filter, the emitter follower improves input impedance of the measuring channel and performs voltage division processing to obtain an input signal of the high-speed analog-to-digital converter, the high-speed analog-to-digital converter converts the analog signal processed by the signal conditioning circuit into a digital signal, and the high-speed communication isolation interface chip electrically isolates the measuring channel.
3. The multi-channel synchronous detection plate for the power batteries as claimed in claim 2, wherein the FPGA processing unit controls the high-speed analog-to-digital converters in the measurement channels to synchronously start sampling, reads the output results of the high-speed analog-to-digital converters to synchronously execute calibration calculation, and transmits the obtained final measurement results to the single chip microcomputer in a DMA mode.
4. The multi-channel synchronous detection plate for power batteries according to claim 3, wherein the single chip microcomputer reads the measurement result and sends the measurement result to a PC or a remote server through the Ethernet interface.
5. The multi-channel synchronous detection plate for power batteries according to claim 3, wherein the single chip microcomputer transmits control instructions and key battery information to the charge and discharge tester through the CAN communication interface.
6. A power battery multi-channel synchronous detection board as claimed in claim 1, wherein there are a plurality of said detection boards, one of said detection boards is used as a master detection board and works in master mode and sends out a synchronous pulse signal, the other of said detection boards is used as a slave detection board and works in slave mode and keeps synchronous with said master detection board, and said master detection board is connected with said slave detection board through said master-slave synchronous interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211674904.3A CN115980598A (en) | 2022-12-26 | 2022-12-26 | Power battery multichannel synchronous detection board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211674904.3A CN115980598A (en) | 2022-12-26 | 2022-12-26 | Power battery multichannel synchronous detection board |
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| Publication Number | Publication Date |
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| CN115980598A true CN115980598A (en) | 2023-04-18 |
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| CN202211674904.3A Pending CN115980598A (en) | 2022-12-26 | 2022-12-26 | Power battery multichannel synchronous detection board |
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