CN112557712B - Parallel pulse current test system - Google Patents
Parallel pulse current test system Download PDFInfo
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- CN112557712B CN112557712B CN202011418156.3A CN202011418156A CN112557712B CN 112557712 B CN112557712 B CN 112557712B CN 202011418156 A CN202011418156 A CN 202011418156A CN 112557712 B CN112557712 B CN 112557712B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention relates to a parallel pulse current test system which sequentially comprises the steps of high-voltage parallel connection, loop inspection, signal interconnection, program compiling, signal inspection and test development. The current pulse test of the battery is realized by connecting two charging and discharging machines with the same type and the common capability in parallel and designing special signal synchronization software, and the blank that the requirement of the current pulse test is difficult to meet due to the limitation of the maximum current and the power of the charging and discharging machines and the test parameters can only be compromised to the limit capability of the equipment is filled.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a parallel pulse current testing system.
Background
In the traditional battery detection field, when the voltage platform of the battery is higher and the battery capacity is larger, the maximum current and power of the charge and discharge machine are limited, so that the requirement of current pulse test is difficult to meet, and the test parameters can only be compromised to the limit capability of equipment.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems, the invention provides a parallel pulse current test system, which realizes the current pulse test of a battery by connecting two or even more charging and discharging machines with the same type and common capability in parallel and designing special signal synchronization software.
In order to achieve the purpose, the invention provides the following technical scheme: the invention provides a parallel pulse current testing system, which comprises the following steps:
the method comprises the following steps: under the shutdown state of the equipment, connecting high-voltage output lines of the first charge-discharge machine and the second charge-discharge machine in parallel, and respectively connecting the high-voltage output lines connected in parallel with the anode and the cathode of the battery pack under the safe condition;
step two: closing an internal high-voltage loop of the battery pack, and checking whether the first charge-discharge machine and the second charge-discharge machine obtain the same voltage value;
step three: mounting both the CAN node of the first computer and the CAN node of the second computer under a CAN bus, and setting the same baud rate and the same message analysis format;
step four: writing a main program on the first computer, writing a slave program on the second computer, wherein the main program triggers the slave program and is synthesized with the slave program;
step five: checking whether the signal synchronization system works normally by using a small current, wherein if the signal synchronization effect is poor, the synthesized current pulse is in a step shape, otherwise, the synthesized current pulse is in a rectangular shape;
step six: starting the slave program, entering a ready state, starting the main program, and testing and starting; when the main program is executed to a specific step, a signal value is sent through a CAN message to trigger the auxiliary program, the first charge-discharge machine and the second charge-discharge machine simultaneously output a preset value 50% current pulse, the two pulses are superposed, and a 100% current pulse is output.
Further, the method comprises the following steps: setting the signal value to be 0 at first, setting the signal value to be 1 after the first time, and executing 50% of positive current pulse; when the signal value is set to 2 after the second time is set aside, 50% negative current pulse is required;
the slave program is firstly set to be in a resting state, and then whether a signal value is 1 or not is judged; if the signal value is not 1, returning to a resting state; if the signal value is 1, executing 50% of the positive current pulse, setting the positive current pulse to be in a resting state, and judging whether the signal value is 2; if the signal value is not 2, returning to a resting state; if the signal value is 2, then the negative current pulse with the requirement of 50 percent is executed and then is set aside again;
and after the main program and the auxiliary program are synthesized, after the main program and the auxiliary program are set aside for the first time, the required positive current pulse is executed, and after the auxiliary program is set aside for the second time, the required negative current pulse is executed and then set aside again.
The invention has the beneficial effects that: according to the parallel pulse current testing system provided by the invention, two charging and discharging machines with the same type and common capacity are connected in parallel, and special signal synchronization software is designed, so that the current pulse test of the battery is realized, and the blank that the requirements of the current pulse test are difficult to meet due to the limitation of the maximum current and the power of the charging and discharging machines, and the test parameters only can be compromised to the limit capacity of equipment is filled.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, the maximum power of a charging and discharging machine with normal capacity is 250kW, the maximum voltage is 900V, and the maximum current is 1000A (due to the limitation of the maximum power, the maximum voltage and the maximum current cannot be reached at the same time).
To perform a current pulse test on a certain battery pack, the voltage of the battery pack is about 400V, the current pulse requirement is 1000A, and it is calculated that the power of the charging and discharging machine is at least 400kW to meet the test requirement. The maximum power of the charge and discharge machine is only 250kW, and the test requirement cannot be met. In the conventional practice, if the test is still carried out, only the limit capability of the device is compromised, for example, the current pulse is reduced to 625A, but in this case, the performance of the battery cannot be sufficiently tested.
The invention provides a parallel pulse current test system, which comprises the following steps:
the method comprises the following steps: under the shutdown state of the equipment, connecting high-voltage output lines of a first charge-discharge machine and a second charge-discharge machine in parallel, and respectively connecting the high-voltage output lines connected in parallel with the anode and the cathode of a battery pack under the safe condition;
step two: closing an internal high-voltage loop of the battery pack, and checking whether the first charge-discharge machine and the second charge-discharge machine obtain the same voltage value;
step three: mounting both the CAN node of the first computer and the CAN node of the second computer under a CAN bus, and setting the same baud rate and the same message analysis format;
step four: writing a main program on the first computer, writing a slave program on the second computer, triggering the slave program by the main program, and synthesizing the slave program with the main program;
step five: checking whether the signal synchronization system works normally by using small current, wherein if the signal synchronization effect is poor, the synthesized current pulse is stepped, otherwise, the current pulse is rectangular;
step six: firstly starting the slave program, entering a ready state, starting the main program, and testing and starting; when the master program is executed to a specific process step, the slave program is triggered by a CAN message sending signal value, the first charge-discharge machine and the second charge-discharge machine simultaneously output a preset value 50% current pulse, the two pulses are superposed, and a 100% current pulse is output.
By adopting the strategy of pulse rising edge alignment, the synchronous output of preset pulse widths of different charging and discharging machines and pulses in different orders can be ensured. If only the initial positions of the program are aligned (i.e. the first and second charge and discharge machines start the charge and discharge program synchronously), time errors may be caused due to inconsistent closing times of the relays by the charge and discharge machines, and the preset current pulses may not be output accurately at the specified time, and the pulses may appear in a step shape.
Taking the current pulse test of a certain battery pack as an example, the test requires a 5 th output time length of 5s and a current pulse width of +600A, and a 30 th output time length of 5s and a current pulse width of-1000A. If the test system is correctly built, the synthesized current pulse has a good effect and is rectangular; if the resulting current pulse is significantly stepped, the communication lines and master-slave procedures should be checked.
Further, the main program sets the signal value to 0 at first, sets the signal value to 1 after being set aside for 5 seconds, and executes the current pulse 300A; when the signal value is set to be 2 after the standing for 20 seconds, the current pulse 500A is executed and then the standing is carried out again;
the slave program is firstly set to be in a resting state, and then whether a signal value is 1 or not is judged; if the signal value is not 1, returning to a resting state; if the signal value is 1, executing a current pulse 300A, setting the current pulse to be in a resting state, and judging whether the signal value is 2; if the signal value is not 2, returning to a resting state; if the signal value is 2, the current pulse 500A is executed and then is set aside again;
after the main program and the slave program are synthesized, the operation is suspended for 5 seconds, the current pulse 600A is executed, the operation is suspended for 20 seconds, and the operation is suspended again after the current pulse 1000A is executed.
According to the parallel pulse current testing system provided by the invention, two charging and discharging machines with the same type and common capacity are connected in parallel, and special signal synchronization software is designed, so that the current pulse test of the battery is realized, and the blank that the requirements of the current pulse test are difficult to meet due to the limitation of the maximum current and the power of the charging and discharging machines, and the test parameters only can be compromised to the limit capacity of equipment is filled.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. A parallel pulse current test system is characterized in that: the method comprises the following steps:
the method comprises the following steps: under the shutdown state of the equipment, connecting high-voltage output lines of a first charge-discharge machine and a second charge-discharge machine in parallel, and respectively connecting the high-voltage output lines connected in parallel with the anode and the cathode of a battery pack under the safe condition;
step two: closing an internal high-voltage loop of the battery pack, and checking whether the first charge-discharge machine and the second charge-discharge machine obtain the same voltage value or not;
step three: mounting both the CAN node of the first computer and the CAN node of the second computer under a CAN bus, and setting the same baud rate and the same message analysis format;
step four: writing a main program on the first computer, writing a slave program on the second computer, wherein the main program triggers the slave program and is synthesized with the slave program;
step five: checking whether the signal synchronization system works normally by using small current, wherein if the signal synchronization effect is poor, the synthesized current pulse is stepped, otherwise, the current pulse is rectangular;
step six: firstly starting the slave program, entering a ready state, starting the main program, and testing and starting; when the main program is executed to a specific step, a signal value is sent through a CAN message to trigger the auxiliary program, the first charge-discharge machine and the second charge-discharge machine simultaneously output a preset value 50% current pulse, the two pulses are superposed, and a 100% current pulse is output;
setting the signal value to be 0 at first, setting the signal value to be 1 after the first time, and executing 50% of positive current pulse; when the signal value is set to 2 after the second time is set aside, 50% negative current pulse is required;
the slave program is set to be in a resting state firstly, and then whether a signal value is 1 or not is judged; if the signal value is not 1, returning to a resting state; if the signal value is 1, executing 50% of positive current pulse, setting the positive current pulse to be in a resting state, and judging whether the signal value is 2; if the signal value is not 2, returning to a resting state; if the signal value is 2, then the negative current pulse with the requirement of 50 percent is executed and then is set aside again;
and after the main program and the auxiliary program are synthesized, after the main program and the auxiliary program are set aside for the first time, the required positive current pulse is executed, and after the auxiliary program is set aside for the second time, the required negative current pulse is executed and then set aside again.
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| CN113702850B (en) * | 2021-08-27 | 2024-04-16 | 深圳市新威尔电子有限公司 | Battery detection method for sending CAN message based on process flow |
| CN114422287B (en) * | 2021-12-09 | 2023-07-07 | 福建星云电子股份有限公司 | Microsecond-level charge and discharge synchronous control method and system |
| CN115061054A (en) * | 2022-06-07 | 2022-09-16 | 成都四威功率电子科技有限公司 | Power battery high-power pulse discharge test equipment and method |
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