CN113188582B - System and method for testing data acquisition precision of battery management system - Google Patents
System and method for testing data acquisition precision of battery management system Download PDFInfo
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- CN113188582B CN113188582B CN202110402329.0A CN202110402329A CN113188582B CN 113188582 B CN113188582 B CN 113188582B CN 202110402329 A CN202110402329 A CN 202110402329A CN 113188582 B CN113188582 B CN 113188582B
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- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
A data acquisition precision test system and method for a battery management system are disclosed, wherein the system comprises a battery management system BMS, a data acquisition unit, a first switch functional component, a second switch functional component and a first sensor; the battery management system BMS is connected with the first sensor through the first switch functional component and the second switch functional component in sequence; and a voltage acquisition channel of the data acquisition unit is connected to a line between the first switch functional part and the second switch functional part. According to the invention, the data acquisition value of the battery management system BMS, the environmental state K value of the environmental chamber and the voltage value of the resistance value sensor circuit end of the battery management system BMS sensor at the same moment are measured, so that the simultaneity of the measured data is ensured, the reason of abnormal data acquisition function is convenient to investigate in time, the testing efficiency is greatly improved, especially the efficiency when a plurality of sensors are tested simultaneously, the research and development testing period of the battery management system BMS is shortened, and the labor intensity of testing personnel is reduced.
Description
Technical Field
The invention relates to the technical field of battery management systems, in particular to a system and a method for testing data acquisition precision of a battery management system.
Background
The battery management system BMS is used for collecting parameter data of the battery and monitoring the state of the battery system, so that the safety performance and the service life of the battery system are improved. The battery management system BMS plays an important role in protecting electric vehicles, charging station equipment and personnel safety.
The temperature of the battery system is one of important state parameters of the battery system, the battery management system BMS collects the temperature of the battery system through a sensor and executes a temperature control strategy of the battery system according to the collected battery temperature data, so that the battery system can work in a safe temperature range. The temperature acquisition accuracy of the battery management system BMS is of great importance for the effective execution of the temperature control strategy.
The basic thought of the existing BMS temperature acquisition precision testing method for the battery management system is as follows: and giving a constant temperature environment, and comparing the temperature value acquired by the battery management system BMS with the actual temperature value to judge whether the temperature acquisition precision of the battery management system BMS meets the relevant precision requirement.
If the detection result shows that the temperature acquisition precision of the battery management system BMS does not meet the requirements, the conventional test method cannot timely judge whether the fault reason is the internal fault of the battery management system BMS or the fault of the sensor, so that the fault is required to be checked by measuring the resistance of the sensor.
In order to avoid the influence of the internal resistance of the battery management system BMS, when the resistance of the sensor is measured, the resistance measuring device needs to be independently connected with the sensor, namely, the sensor and a temperature acquisition interface of the battery management system BMS are disconnected to measure the resistance of the sensor, the measuring method has complex operation steps, the probability of measuring errors caused by operation is very high, and the steps are more complicated for the test of connecting a plurality of sensors. Meanwhile, the reading time of the resistance measurement and monitoring component is inconsistent, so that the temperature fluctuation degree in the full temperature range of the environmental chamber is extremely high.
Disclosure of Invention
The invention provides a system and a method for testing data acquisition precision of a Battery Management System (BMS), which can avoid the influence of the BMS internal resistance, optimize the detection steps and improve the detection accuracy. The specific scheme is as follows:
a battery management system data acquisition accuracy test system, comprising:
the system comprises a battery management system BMS, a data collector, a first switch functional component, a second switch functional component and a first sensor;
a data acquisition port of the battery management system BMS is connected with the first sensor through the first switch functional component and the second switch functional component in sequence;
and a voltage acquisition channel of the data acquisition unit is connected to a line between the first switch functional part and the second switch functional part.
The optimized battery management system BMS also comprises a first environment bin and a second environment bin, wherein the battery management system BMS is placed in the first environment bin; the first sensor is placed in a second environmental chamber.
Preferably, a second sensor is further arranged in the second environment bin and connected with a collection channel of the data collector.
The optimization method further comprises the following steps:
the output end of the direct current power supply is connected with a battery management system BMS;
a battery simulator, the output channel of which is connected with a battery management system BMS;
and a monitoring part connected with the battery management system BMS.
Preferably, the first switch functional component and the second switch functional component are double-pole single-throw switches or relays with switch functions or plug-in terminals.
The testing method of the data acquisition precision testing system of the battery management system comprises the following steps:
s1, building a battery management system data acquisition precision test system;
s2, closing the first switch functional part, disconnecting the second switch functional part, and recording the output voltage Us of the BMS data acquisition port measured by the data acquisition unit;
disconnecting the first switch functional part, closing the second switch functional part, and recording the resistance value R (K) of the first sensor of the battery management system BMS, which is measured by the data collector under the environmental state K;
s3, closing the first switch functional part and the second switch functional part, and recording the line end voltage U (K) of the first sensor of the battery management system BMS, which is measured by the data collector under the environmental state K; the internal resistance value Rs of the battery management system BMS data collection port is calculated according to the following formula,
s4, keeping the environment state K of the battery management system BMS constant, and reading a data value B acquired by the battery management system BMS; recording the numerical value of the environmental state K measured by the data acquisition unit; recording a line end voltage U of a first sensor of a battery management system BMS (battery management system) in an environmental state K measured by a data collector;
s5, calculating the data acquisition precision D of the BMS and the resistance value R of a first sensor of the BMS;
D＝B-K
specifically, the environmental state K is data collected by the battery management system BMS, which is a factor affecting the resistance value of the sensor resistor.
Specifically, step S1 further includes: setting the environmental states K of the first environmental chamber and the second environmental chamber as set values, and standing for set time after the set values are reached; and starting a direct-current power supply, a battery simulator, a data acquisition unit and a monitoring part.
Specifically, step S3 sets a plurality of measurement points by keeping the environmental state K constant by the first environmental chamber and changing the environmental state K by the second environmental chamber.
Specifically, the environmental state K of the first environmental chamber is changed, and the data acquisition precision of the battery management system BMS in different environmental states K is tested.
The invention has the beneficial effects that:
(1) the simultaneity of the measured data is guaranteed by measuring the resistance value sensor line end voltage values of the BMS data collection value, the environmental bin environmental state K value and the BMS sensor at the same moment, the reason of abnormal data collection function is convenient to timely investigate, the testing efficiency is greatly improved, especially the efficiency when a plurality of sensors are tested simultaneously is improved, the BMS research and development testing period of the battery management system is shortened, and the labor intensity of testers is reduced.
(2) Through setting up first switch functional unit and second switch functional unit, simplified the measurement step, reduced the error that is brought by manual operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment.
Fig. 2 is a schematic diagram of a data acquisition precision testing system of a battery management system according to the present invention.
Fig. 3 is a schematic diagram of an output voltage test circuit of a BMS temperature acquisition port of the battery management system according to the present invention.
Fig. 4 is a schematic diagram of an internal resistance test circuit of a battery management system BMS temperature acquisition port according to the present invention.
Fig. 5 is a schematic diagram of a testing circuit of the testing method of the data acquisition precision testing system of the battery management system according to the present invention.
The symbols marked in the drawings have the following meanings:
1. a battery management system BMS; 2. a data acquisition unit; 3. a first sensor; 4. a first switch function part; 5. a second switch function; 6. a first environmental bin; 7. a second environmental chamber; 8. a direct current power supply; 9. a battery simulator; 10. a monitoring component; 11. a second sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a data acquisition precision test system of a battery management system, which comprises:
the battery management system BMS1, data collection station 2, first sensor 3, first switch function 4, second switch function 5, first environmental chamber 6, second environmental chamber 7, DC power supply 8, battery simulator 9, monitoring component 10, second sensor 11. In the scheme, taking temperature data acquisition as an example, the first sensor 3 and the second sensor 11 are temperature sensors, and the environmental state K is temperature; if the scheme takes humidity data acquisition as an example, the first sensor 3 and the second sensor 11 are humidity sensors, and the environmental state K is humidity, which is not described herein again.
A data acquisition port of the battery management system BMS1 is connected with the first sensor 3 through the first switch functional component 4 and the second switch functional component 5 in sequence; the battery management system BMS1 is connected with the positive and negative electrodes of the output end of the direct current power supply 8, the single voltage acquisition line of the battery management system BMS1 is connected with the output channel of the battery simulator 9, the battery management system BMS1 is connected with the monitoring component 10, and the battery management system BMS1 is connected with the first sensor 3 of the battery management system sequentially through the first switch functional component 4 and the second switch functional component 5; the battery management system BMS1 is used for collecting parameter data of the battery and monitoring the state of the battery system.
The voltage detection channel of the data detection device 2 is connected to the line between the first switching function 4 and the second switching function 5. The data acquisition unit 2 comprises 40 data acquisition channels, each data acquisition channel can acquire temperature, voltage and resistance, the temperature acquisition range is-40-135 ℃, the temperature acquisition precision is not more than 0.1 ℃, the voltage acquisition range is 0-10V, the voltage acquisition precision is not more than 0.1%, the resistance acquisition precision is not more than 0.01k omega, the internal resistance of a voltmeter can be selected to be 10M omega or more than 10000M omega, the automatic recording function of the data acquisition unit 2 can be used, the data acquisition frequency is set, and data are automatically recorded. The data collector 2 is used for collecting the actual temperature value of the second environmental chamber 7, and is matched with the on-off states of the first switch functional component 4 and the second switch functional component 5 to collect the line end voltage of the first sensor 3 of the battery management system BMS1 and the output voltage of the temperature collection port of the battery management system BMS1, the temperature collection channel of the data collector is connected with the temperature sensor, and the voltage collection channel of the data collector is connected with the first sensor 3 of the battery management system BMS1 in parallel through the connecting point between the first switch functional component 4 and the second switch functional component 5.
The first switch functional part 4 is set as a double-pole single-throw switch; the second switch function 5 is arranged as a double pole single throw switch.
The battery management system BMS1 is placed in the first environmental chamber 6; the first sensor 3 and the second sensor 11 are placed in the second environmental chamber 7, and the first sensor 3 and the second sensor 11 are placed at the same position in the second environmental chamber 7. The first environmental chamber 6 and the second environmental chamber 7 are used for providing an environment with controllable and stable temperature, and the controllable temperature range is-40 ℃ to 135 ℃.
The direct current power supply 8 is used for providing stable direct current supply voltage for the battery management system BMS1, the maximum output voltage is 60V, the maximum output current is 3A, the power supply requirements of the battery management system BMS1 of 12V, 24V and 48V can be met, and the anode and the cathode of the output end of the direct current power supply are connected with the battery management system BMS 1;
the battery simulator 9 is used for simulating the output state of a real battery and the charging and discharging characteristics of the battery, and an output channel of the battery simulator is connected with a single voltage acquisition line of a battery management system BMS 1; the number of output channels of the battery simulator 9 is 100, the output potential difference range of adjacent channels is 0-5V, the voltage stabilization precision is less than 1mV, and the power frequency ripple voltage is less than 0.5 mV.
The monitoring part 10 is provided to be connected to the battery management system BMS1 at an upper computer. The monitoring component 10 may also be configured as a software with message recording function cooperating with the DBC file.
The testing method using the data acquisition precision testing system of the battery management system comprises the following steps:
as shown in the flowchart of fig. 1, the collection accuracy of the battery management system to be tested for different temperatures in the range of-40 ℃ to 125 ℃ and the resistance value of the first sensor 3 in the range of-40 ℃ to 125 ℃ are tested in three temperature environments of-20 ℃, 25 ℃ and 65 ℃.
And S1, building a battery management system data acquisition and test system as shown in figure 2. The first switch functional part 4 and the second switch functional part 5 both use double-pole single-throw switches, and the monitoring part 10 uses an upper computer.
Specifically, the temperature of the first environmental chamber 6 is set to-20 ℃, and the first environmental chamber is kept stand for 1 hour after reaching the set temperature; turning on the direct current power supply 8, and setting an output voltage value as a power supply voltage of the battery management system BMS 1; starting the battery simulator 9 and setting a single voltage value; starting the data acquisition device 2 and setting an acquisition channel; turning on the monitoring part 10;
s2, measuring the output voltage of a temperature acquisition port of a battery management system BMS1 and the internal resistance of the temperature acquisition port of a battery management system BMS 1;
setting the temperature of the second environmental chamber 7 to 25 ℃, and standing for 30 minutes after the set temperature is reached;
as shown in fig. 3, the first switch function part 4 is closed, the second switch function part 5 is opened, and the output voltage Us of the temperature acquisition port of the battery management system BMS1 measured by the recording data acquisition device 2;
as shown in fig. 4, the first switch function part 4 is opened, the second switch function part 5 is closed, and the resistance value R25 of the first sensor 3 of the battery management system BMS1 at the temperature of 25 ℃ measured by the data collector 2 is recorded;
s3, as shown in figure 5, the first switch functional part 4 is closed, the second switch functional part 5 is closed, and the voltage U25 of the end of the first sensor 3 of the battery management system BMS1 measured by the data collector 2 at the temperature of 25 ℃ is recorded;
the internal resistance value Rs of the temperature collection port of the battery management system BMS1 is calculated according to the following formula,
s4, keeping the temperature of the first environmental chamber 6 constant, setting the temperature of the second environmental chamber 7 to-40 ℃, standing for 30 minutes after the set temperature is reached, and recording and monitoring the temperature value TB acquired by the battery management system BMS1 read by the monitoring part 10; recording the actual temperature value T in the second environmental chamber 7 measured by the data collector 2; the recording data collector 2 measures the line end voltage U of the first sensor 3 of the battery management system BMS1 under the environment.
And adjusting the temperature of the second environment bin 7 to be within the range of-40-125 ℃ and taking the temperature as a measuring point every 5 ℃, repeating the testing step, recording the voltage U, the actual temperature value T and the temperature value TB of the data circuit end, and completing the testing of different temperature environments.
S5, calculating the data acquisition precision D of the BMS1 and the resistance R of the first sensor 3 of the BMS1, keeping the environmental function temperature of the battery management system to be tested constant, measuring the temperature of the first sensor 3 at 25 ℃, measuring the output voltage of the temperature acquisition port of the battery management system to be tested, the resistance of the first sensor 3 of the battery management system to be tested and the line end voltage of the first sensor 3 of the battery management system to be tested, thereby calculating the internal resistance of the temperature acquisition port of the battery management system to be tested,
D＝TB-T
judging whether the data acquisition precision of the battery management system BMS1 is qualified or not according to the D value; it is determined whether the first sensor 3 of the battery management system BMS1 is qualified through the R value.
The calculation processing of the data in step S5 in this embodiment may be performed after the test is finished, or may be automatically calculated by an edit formula using data processing software to obtain the resistance value of the first sensor 3 in time.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A test method of a battery management system data acquisition precision test system is characterized by comprising the following steps:
s1, building a data acquisition precision test system of the battery management system;
s2, closing the first switch functional part (4), opening the second switch functional part (5), and recording the output voltage Us of the data acquisition port of the battery management system BMS (1) measured by the data acquisition unit (2);
disconnecting the first switch functional part (4), closing the second switch functional part (5), and recording the resistance value R (K) of the first sensor (3) of the battery management system BMS (1) in the environmental state K, which is measured by the data collector (2);
s3, closing the first switch functional part (4), closing the second switch functional part (5), and recording the circuit end voltage U (K) of the first sensor (3) of the battery management system BMS (1) measured by the data collector (2) under the environmental state K; the internal resistance value Rs of the data collection port of the battery management system BMS (1) is calculated according to the following formula,
s4, keeping the environment state K of the battery management system BMS (1) constant, and reading a data value B acquired by the battery management system BMS (1); recording the numerical value of the environmental state K measured by the data acquisition unit (2); recording a line end voltage U of a first sensor (3) of a battery management system BMS (1) in an environmental state K measured by a data collector (2);
s5, calculating the data acquisition precision D of the battery management system BMS (1) and the resistance R of the first sensor (3) of the battery management system BMS (1);
D＝B-K
the data acquisition precision test system of the battery management system comprises:
the battery management system BMS (1), the data collector (2), a first switch functional component (4), a second switch functional component (5) and a first sensor (3);
a data acquisition port of the battery management system BMS (1) is connected with the first sensor (3) through the first switch functional component (4) and the second switch functional component (5) in sequence;
the voltage acquisition channel of the data acquisition unit (2) is connected to a line between the first switch functional part (4) and the second switch functional part (5).
2. The testing method of the battery management system data acquisition precision testing system according to claim 1, characterized by further comprising a first environmental chamber (6) and a second environmental chamber (7), wherein the battery management system BMS (1) is placed in the first environmental chamber (6); the first sensor (3) is placed in a second environmental chamber (7).
3. The testing method of the battery management system data acquisition precision testing system according to claim 2, characterized in that a second sensor (11) is further arranged in the second environmental chamber (7), and the second sensor (11) is connected with an acquisition channel of the data acquisition unit (2).
4. The method for testing the data acquisition precision testing system of the battery management system according to claim 1, further comprising:
a DC power supply (8) having an output terminal connected to the battery management system BMS (1);
a battery simulator (9) whose output channel is connected to the battery management system BMS (1);
and a monitoring unit (10) connected to the battery management system BMS (1).
5. The testing method of the data acquisition precision testing system of the battery management system according to claim 1, wherein the first switch functional component (4) and the second switch functional component (5) are a double-pole single-throw switch or a relay with a switch function, or a plug-in terminal.
6. The test method according to claim 1, characterized in that the environmental condition K is a factor affecting the resistance value of the sensor resistor, i.e. data collected by the battery management system BMS (1).
7. The testing method according to claim 1, wherein step S1 further comprises: setting the environmental states K of the first environmental chamber (6) and the second environmental chamber (7) as set values, and standing for set time after the set values are reached; the method comprises the steps of starting a direct current power supply (8), a battery simulator (9), a data acquisition unit (2) and a monitoring part (10).
8. The test method according to claim 1, wherein step S3 sets the plurality of measurement points by keeping the environmental state K constant through the first environmental chamber (6) and changing the environmental state K through the second environmental chamber (7).
9. The testing method according to claim 1 or 8, characterized in that the environmental state K of the first environmental chamber (6) is changed, and the data acquisition accuracy of the battery management system BMS (1) at different environmental states K is tested.
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