CN212410830U - Test system for electrical connections in a battery system - Google Patents
Test system for electrical connections in a battery system Download PDFInfo
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- CN212410830U CN212410830U CN202020478432.4U CN202020478432U CN212410830U CN 212410830 U CN212410830 U CN 212410830U CN 202020478432 U CN202020478432 U CN 202020478432U CN 212410830 U CN212410830 U CN 212410830U
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Abstract
The utility model relates to an electrical connection's test system in battery system belongs to power battery system test technical field. The testing device comprises a processor and a charging module which is in communication connection with the processor, wherein the processor is connected with a voltage and current acquisition interface and is used for acquiring and connecting the output end of the battery system to be tested so as to acquire the voltage and the current of the output end of the battery system to be tested; the processor is connected with a communication interface, is used for being in communication connection with the battery management system, is used for obtaining the voltage of each battery in the battery system to be tested, and calculates the internal resistance value of the electrical connection in the battery system to be tested by combining the voltage and the current of the output end of the battery system to be tested so as to judge the quality of the electrical connection. The utility model discloses an on-line measuring means directly calculates the electrical connection internal resistance, can directly reflect electric component and coupling part's resistance, has realized the accurate on-line measuring of electric connection in the battery system, can be quick, effectual discernment electric component and connection problem, and the reliability of judgement is high.
Description
Technical Field
The utility model belongs to the technical field of the power battery system test, electrical connection's test system in the concretely relates to battery system.
Background
At present, more and more electric automobiles applying the lithium ion battery system are provided, the energy density of the lithium ion battery system is increased day by day, more safety problems are exposed, and a high-voltage electric part occupies an important ring in the electric safety of the battery system. Most of the causes of safety accidents mainly focus on the problems of abnormal resistance or poor connection of the high-voltage electrical components, in addition to the failure of the battery itself, and therefore, the quality of the high-voltage electrical components and the connection thereof needs to be evaluated in the manufacturing process of the lithium ion battery system.
The high-voltage electrical components and their connections are prone to connection quality problems, such as the positions indicated by the dotted line boxes in the high-voltage connection lines/copper bars, the electrical components and the batteries B1-Bn in the battery system of fig. 1, and the electrical components and their connection quality can be determined by the resistances (using DCR) of the electrical components and their connection portions (electrical connection for short)Electric applianceIndicated) to evaluate. The existing method for detecting the electrical parts and connection quality of the battery system in the industry at present is to directly measure the direct current resistance DCR of the battery systemSystem for controlling a power supplyBased on past actual measurement data, DCRSystem for controlling a power supplyIs generally DCRElectric applianceAbout 6 times higher, so by measuring the direct current resistance DCRSystem for controlling a power supplyThe internal resistance of the electrical connection can be converted, and the electrical part and the connection quality thereof can be evaluated through the internal resistance value.
The problems that arise from this are:
in one aspect，DCRSystem for controlling a power supplyThis index is also not sufficiently sensitive to abnormalities in the electrical components and their connections. The reason is that the DC internal resistance DCR of the battery systemSystem for controlling a power supplyComprises two parts, one part is an electrically connected internal resistance DCRElectric applianceThe other part is the sum of direct current internal resistances of n batteries in the battery system
Based on actual measurement data, DCRSystem for controlling a power supplyIs generally DCRElectric applianceAbout 6 times of the total weight of the product. Also, once DCR is finishedElectric applianceA large variation is present in the amount of time,
the same value of (A) is changed, and the two changes are counteracted, so that the DCR is finally calculatedElectric applianceThe error of (2) is large, the problems of the electrical parts and the connection thereof cannot be reliably identified, and potential safety hazards are caused.
In another aspect, DCRSystem for controlling a power supplyThis index does not directly reflect the resistance of the electrical component and its connections, DCRBattery with a battery cellWhich varies significantly with the temperature of the battery at the time of measurement. If the environmental temperature control of the production line is not stable, the DCRSystem for controlling a power supplyThe measurement result of (2) is also unstable, which results in that the electrical component and the connection quality thereof cannot be effectively reflected, and the judgment accuracy of the electrical component and the connection quality thereof is influenced.
In summary, the method of the prior art is used for detecting and evaluating the electrical components and the connection quality of the electrical components of the battery system, and has the defect of inaccurate judgment, if wrong judgment occurs, the fact that the internal resistance of the electrical components and the connection thereof is too large or too small is not found in time, and battery failure or safety accidents may be caused. In order to solve the above problem, it is generally necessary to disassemble each battery in the battery system, detect the internal resistance of each battery, and determine the sum of the direct current internal resistances of n batteries in the battery system
In direct current internal resistance DCR according to battery systemSystem for controlling a power supplyAnd
difference, internal resistance DCR to obtain reliable electrical connectionElectric applianceHowever, there are problems that the measurement process is troublesome and the test time is long.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electrical connection's test system in battery system for the test method accuracy of electrical connection is low or test time is long problem in solving current battery system. Meanwhile, another test system for electrical connection in a battery system is provided, and is used for solving the problems of low reliability or long test time of the existing test method for electrical connection in the battery system.
Based on the above purpose, a technical scheme of a test system for electrical connection in a battery system is as follows:
the testing equipment comprises a processor, wherein the processor is connected with a voltage and current acquisition interface circuit, and the voltage and current acquisition interface circuit is used for sampling and connecting the positive and negative output ends of the battery system to be tested so as to obtain the voltage and current of the positive and negative output ends of the battery system to be tested;
the processor is connected with a communication interface circuit, is used for being in communication connection with a battery management system in the battery system to be tested, is used for acquiring voltages at two ends of each battery in the battery system to be tested, and calculates the internal resistance value of the electrical connection in the battery system to be tested by combining the voltages and the currents of the positive and negative output ends of the battery system to be tested, so as to judge the quality of the electrical connection in the battery system to be tested;
the test equipment further comprises a charge-discharge module, the charge-discharge module is connected with the voltage and current acquisition interface circuit, and the charge-discharge module is used for charging or discharging the battery in the battery system to be tested through the voltage and current acquisition interface circuit.
Additionally, the processor of the test equipment is connected with the charge and discharge module through a communication line to realize communication interaction between the charge and discharge module and the test equipment, and is used for informing the charge and discharge module to stop executing the charge and discharge test program when the processor identifies that the voltage, the current or the battery voltage of the battery system to be tested, which is obtained through the voltage and current acquisition interface circuit and the first communication interface circuit, exceeds a normal range so as to avoid danger.
The beneficial effects of the above technical scheme are:
the utility model realizes the accurate online measurement of the electrical connection in the battery system through an integrated test device, namely, the battery system to be tested is charged and discharged through a charging and discharging module of the test device; acquiring the voltage and the current of the output end of the battery system to be tested in real time through a voltage and current acquisition interface circuit of the testing equipment; acquiring voltages at two ends of each battery in a battery system to be tested in real time through a communication interface circuit of the testing equipment; and finally, a processor in the testing equipment calculates by using the voltage and the current, so that the internal resistance value of the electrical connection in the battery system to be tested can be quickly obtained, the accuracy is high, and the accurate internal resistance of the electrical connection is utilized to quickly judge the electrical part and the connection quality of the electrical part, thereby realizing the accurate online measurement of the electrical connection in the battery system. Compared with the prior art, the utility model discloses an on-line measuring means direct calculation electrical connection internal resistance, can direct reflection electric component and coupling part's resistance, can be quick, effectual discernment electric component and connection problem, the reliability of judging (evaluation) is high.
In order to obtain the internal resistance value of the electrical connection in the battery system through the calculation of the processor, further, the calculation formula of the internal resistance value of the electrical connection in the battery system to be tested is as follows:
in the formula, DCRElectric applianceIs the internal resistance, I, of the electrical connections in the battery system under test0Is the current at the positive and negative output terminals of the battery system to be tested at the first detection moment I1For the current at the positive and negative output terminals of the battery system to be tested at the second detection moment, U0Corresponding to the voltages of the positive and negative output ends of the battery system to be detected at the first detection moment，U1The second detection moment corresponds to the voltages of the positive and negative output ends of the battery system to be detected,
for the voltage of the individual cells in the battery system under test at the first test moment,
and n is the voltage of each battery in the battery system to be tested at the second detection moment, and the number of the batteries in the battery system to be tested.
Further, the voltage and current acquisition interface circuit comprises a voltage acquisition interface circuit and a current acquisition interface circuit, wherein the current acquisition interface circuit is connected with a Hall current sensor, and the Hall current sensor is used for detecting and connecting the output end of the battery system to be detected.
Furthermore, a communication line is connected between the charge-discharge module and the processor in the test equipment, and the processor is used for sending a command of stopping charging and discharging to the charge-discharge module through the communication line when detecting that the battery system to be tested or the charge-discharge module is abnormal, so as to protect the battery system to be tested.
Based on the above purpose, another technical solution of a test system for electrical connection in a battery system is as follows:
the testing equipment comprises a processor, wherein the processor is connected with a voltage and current acquisition interface circuit, and the voltage and current acquisition interface circuit is used for sampling and connecting the positive and negative output ends of the battery system to be tested so as to obtain the voltage and current of the positive and negative output ends of the battery system to be tested;
the processor is connected with a communication interface circuit, is used for being in communication connection with a battery management system in the battery system to be tested, is used for acquiring the voltage of each battery in the battery system to be tested, and calculates the internal resistance value of the electrical connection in the battery system to be tested by combining the voltage and the current of the positive and negative output ends of the battery system to be tested so as to judge the quality of the electrical connection in the battery system to be tested;
the testing equipment is provided with a charge-discharge input interface used for being connected with charge-discharge equipment, and the charge-discharge input interface is connected with the voltage and current acquisition interface circuit.
The utility model discloses a test equipment has realized the accurate on-line measurement of electrical connection in the battery system, namely charges and discharges to the battery system that awaits measuring through the external charging and discharging equipment of test equipment; acquiring the voltage and the current of the output end of the battery system to be tested in real time through a voltage and current acquisition interface circuit of the testing equipment; acquiring voltages at two ends of each battery in a battery system to be tested in real time through a communication interface circuit of the testing equipment; and finally, a processor in the testing equipment calculates by using the voltage and the current, so that the internal resistance value of the electrical connection in the battery system to be tested can be quickly obtained, the accuracy is high, and the accurate internal resistance of the electrical connection is utilized to quickly judge the electrical part and the connection quality of the electrical part, thereby realizing the accurate online measurement of the electrical connection in the battery system. Compared with the prior art, the utility model discloses an on-line measuring means direct calculation electrical connection internal resistance, can direct reflection electric component and coupling part's resistance, can be quick, effectual discernment electric component and connection problem, the reliability of judging (evaluation) is high.
In order to obtain the internal resistance value of the electrical connection in the battery system through the calculation of the processor, further, the calculation formula of the internal resistance value of the electrical connection in the battery system to be tested is as follows:
in the formula, DCRElectric applianceIs the internal resistance, I, of the electrical connections in the battery system under test0Is the current at the positive and negative output terminals of the battery system to be tested at the first detection moment I1For the current at the positive and negative output terminals of the battery system to be tested at the second detection moment, U0Corresponding to the voltages of the positive and negative output ends of the battery system to be detected at the first detection moment, U1Corresponding to the positive and negative electrode outputs of the battery system to be detected at the second detection momentThe voltage at the end of the line is,
for the voltage of the individual cells in the battery system under test at the first test moment,
and n is the voltage of each battery in the battery system to be tested at the second detection moment, and the number of the batteries in the battery system to be tested.
Further, the voltage and current acquisition interface circuit comprises a voltage acquisition interface circuit and a current acquisition interface circuit, wherein the current acquisition interface circuit is connected with a Hall current sensor, and the Hall current sensor is used for detecting and connecting the output end of the battery system to be detected.
Furthermore, a communication line is connected between the charge-discharge module and the processor in the test equipment, and the processor is used for sending a command of stopping charging and discharging to the charge-discharge module through the communication line when detecting that the battery system to be tested or the charge-discharge module is abnormal, so as to protect the battery system to be tested.
Drawings
FIG. 1 is a diagram of electrical connections within a prior art battery system;
fig. 2 is a schematic diagram of the connection of the test system of embodiment 1 of the system of the present invention;
figure 3 is a schematic diagram of a testing apparatus of embodiment 1 of the system of the present invention;
fig. 4 is a schematic diagram of a test system connection according to embodiment 2 of the present invention;
figure 5 is a schematic diagram of a testing apparatus of embodiment 2 of the system of the present invention;
fig. 6 is a schematic diagram of the voltage and current collection interface circuit according to embodiment 2 of the present invention.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
System example 1:
the test system shown in fig. 2 includes an equipment monitor screen (i.e., a display monitor device) and an integrated test device, the equipment monitor screen is connected to a communication interface PL2 of the test device, an anode output end (i.e., a device output positive P +) of the test device is connected to an anode connector K + of the battery system to be tested, and a cathode output end (i.e., a device output negative P-) of the test device is used for connecting to a cathode connector K-; the first communication interface PL1 of the test device, i.e., device communication, is connected to a communication port PL3 of the battery system under test, which is connected to a Battery Management System (BMS), through a communication line.
The test equipment in fig. 3 includes a test box, a charge-discharge module and a processor, where the charge-discharge module is connected to a charge-discharge and voltage-current acquisition interface (used as a voltage-current acquisition interface and a charge-discharge interface) through a voltage-current acquisition interface circuit, and the charge-discharge module is used to charge or discharge a battery in the battery system to be tested through the voltage-current acquisition interface circuit, so as to obtain voltages and currents at the positive and negative output ends of the battery system to be tested.
In fig. 3, the processor is connected to the charging and discharging and voltage and current collecting interface through the voltage and current collecting interface circuit, connected to the first communication interface through the first communication interface circuit, and connected to the second communication interface through the second communication interface circuit, as shown in fig. 3, the charging and discharging and voltage and current collecting interface is correspondingly positive in output of the device and negative in output of the device in fig. 2, the first communication interface is correspondingly device communication in fig. 2, and the second communication interface is correspondingly display communication in fig. 2, and is used for being in communication connection with the device monitoring screen in fig. 2, and is used for displaying a judgment condition of the monitoring test device on quality of electrical connection in the battery system to be tested. In this embodiment, the processor, the voltage and current acquisition interface circuit, the first communication interface circuit, and the second communication interface circuit are all integrated on the PCB.
In fig. 3, a communication line is connected between the processor and the charge-discharge module, and the processor is used for performing communication interaction with the charge-discharge module.
The working principle of the test system is as follows:
after the battery system to be tested is accessed to the test equipment, a charging and discharging module of the test equipment implements a preset charging and discharging test program on the battery system to be tested, so that the voltage and the current of the battery in the battery system are changed; the voltage and current acquisition interface circuit of the test equipment detects the voltage and current of the output end (namely between the anode connector and the cathode connector) of the battery system to be tested, and sends the sampling data of the voltage and the current to the processor of the test equipment; the method comprises the steps that a first communication interface circuit of the testing equipment is communicated with a BMS in a battery system to obtain the voltage of each battery, the voltage data of each battery are sent to a processor, the processor processes and calculates the data to obtain the internal resistance value of the electrical connection in the battery system to be tested, and then the quality of the electrical connection in the battery system to be tested is judged according to the internal resistance value of the electrical connection, wherein one judgment mode is that the internal resistance of the electrical connection is compared with a set internal resistance upper limit and a set internal resistance lower limit, if the internal resistance is higher than the upper limit, the internal resistance is over high, the quality is judged to be abnormal, and disconnection or poor connection is possible to occur; if the internal resistance is lower than the lower limit, the internal resistance is too small, the quality is judged to be abnormal, and the electric parts are possibly burnt out.
In this embodiment, the charge and discharge control process of the battery system to be tested includes two parts:
1. the execution process of the charge and discharge test program comprises the following steps: the charging and discharging module executes the charging and discharging working steps according to a preset charging and discharging test program, the charging and discharging test program is internally provided with the charging and discharging states (charging, discharging and standing) and the current and the duration time of each charging and discharging working step, and when the duration time of a certain working step is reached, the next working step is automatically switched until the execution of the charging and discharging test program is finished.
2. Protection process of abnormal condition: and in the process of executing the charge and discharge test program, the processor monitors the voltage and current data transmitted by the voltage and current acquisition interface circuit and the voltage data of each battery transmitted by the BMS. When the processor identifies that the voltage, the current or the battery voltage of the battery system to be tested exceeds a normal range, the processor informs the charge-discharge module to stop executing the charge-discharge test program through the communication line so as to avoid danger. Or when the processor detects that the voltage and the current in the charging and discharging process exceed the normal range, the processor immediately informs the charging and discharging module to stop charging.
In this embodiment, the voltage and the current of the battery system to be measured need to be continuously collected during the charging and discharging process. The processor is used for capturing voltage values (including the voltage of the battery system collected by the voltage current collecting interface circuit and the voltage of each battery transmitted by the BMS) before and after the current jump in the process data and calculating by using the voltage values and the current values.
Specifically, the data processing of the processor and the calculation process of the internal resistance value of the electrical connection are as follows:
the processor finds out the voltage and the current of the output end of the battery system to be tested corresponding to two moments (a first moment t0 and a second moment t1) and the voltage of each battery according to the obtained data; then, calculating the total internal resistance value of the battery system to be tested according to the voltage and the current of the output end of the battery system to be tested at the first time t0 and the second time t 1; the calculation formula is as follows:
in the formula, DCRSystem for controlling a power supplyIs the total internal resistance value, U, of the battery system to be tested0A first detection time t0 corresponding to the voltage, U, at the output of the battery system under test1A second detection time t1 corresponds to the voltage, I, at the output of the battery system to be tested0Is the current at the output of the battery system to be tested at the first test time t01To measure the current at the output of the battery system at the second test time t1,
according to the voltage and the current of each battery at the first time t0 and the second time t1, the sum of the internal resistance values of each battery is calculated, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
is the sum of internal resistance values of each battery，
To measure the voltage of each cell in the battery system at the first test time t0,
to measure the voltage of each battery in the battery system at the second measurement time t1, n is the number of batteries in the battery system.
And subtracting the total internal resistance value of the battery system to be tested and the internal resistance sum of each battery in the battery system to obtain the internal resistance value of the electrical connection in the battery system to be tested. The calculation formula is as follows:
in the formula, DCRElectric applianceThe internal resistance value of the electrical connection in the battery system to be tested.
The utility model realizes the accurate on-line measurement of the electrical connection in the battery system through an integrated test device, namely, the charge-discharge test program of the battery system is guessed through the charge-discharge module of the test device; acquiring the voltage and the current of the output end of the battery system to be tested in real time through a voltage and current acquisition interface circuit of the testing equipment; acquiring voltages at two ends of each battery in a battery system to be tested in real time through a first communication interface circuit of the testing equipment; and finally, a processor in the testing equipment calculates by using the voltage and the current, so that the internal resistance value of the electrical connection in the battery system to be tested can be quickly obtained, the accuracy is high, and the accurate internal resistance of the electrical connection is utilized to quickly judge the electrical part and the connection quality of the electrical part, thereby realizing the accurate online measurement of the electrical connection in the battery system. Compared with the prior art, the utility model discloses an on-line measuring means directly calculates the electrical connection internal resistance, can directly reflect electric piece and coupling part's resistance, does not receive ambient temperature to influence, can be quick, effectual discernment electric piece and connection problem, and the reliability of judging (evaluating) is high.
In this embodiment, can directly obtain voltage and current sampling data through voltage current collection interface circuit, establish the shunt in the circuit between voltage current collection interface circuit and the output of the battery system that awaits measuring promptly in the cluster, with the measuring current, as other implementation, voltage current collection interface circuit divide into voltage collection interface circuit and current collection interface circuit, gather the voltage of battery system output through voltage collection interface circuit, current collection interface circuit connects hall current sensor's current output end, hall current sensor cup joints the output at the battery system that awaits measuring, a current for detect the output of the battery system that awaits measuring.
It should be noted that the device monitoring screen in this embodiment mainly plays a role of monitoring and displaying, but is not essential; as other embodiments, a display screen can be arranged on the case of the test equipment, and the display screen is connected with the processor and can also play a role in monitoring and displaying.
System example 2:
different from the test device with the charge-discharge module in system embodiment 1, the test device in this embodiment does not integrate the charge-discharge module, and needs to charge and discharge the battery in the battery system by using the existing third-party charge-discharge device, as shown in fig. 4, based on this consideration, the present embodiment provides a test system for electrical connection in the battery system, which includes a test device and a display monitoring device (i.e., a device monitoring screen). The test apparatus of fig. 5 includes a test cabinet and a processor within the cabinet. The device input positive R + and the device input negative R-of the test device are connected with the charge and discharge positive R + and the charge and discharge negative R-of the battery system charge and discharge device of the production line, and the battery system charge and discharge device of the production line is used for implementing a required charge and discharge test program on a battery system to be tested; the negative output of the test equipment and the positive output of the test equipment are connected with the negative connector and the positive connector of the battery system, the negative output of the test equipment and the positive output of the test equipment are charging and discharging and voltage and current acquisition interfaces, and the voltage and the current of the output end of the battery system are acquired and sent to the processor. The processor communicates with the BMS through the first communication interface to acquire the voltage of each battery. Thus, the processor can also calculate the DCRElectric applianceAnd judging the quality of the electrical component and the connection thereof.
Different from the test equipment in the system embodiment 1, the test equipment of the embodiment utilizes the existing battery system charging and discharging equipment of the production line, and establishes a test system together with the test equipment, so that the accurate online measurement of the electrical connection in the battery system is realized, and the same test effect as that of the test system in the system embodiment 1 is achieved. And, under the condition that producing the line and having had current charge-discharge equipment, the test user just can utilize this test equipment just can build test system fast, does not cause the waste of producing the line current equipment, and is with low costs, easy realization. The test principle in this embodiment is the same as that described in system embodiment 1, and is not described here again.
A voltage and current acquisition interface circuit is shown in fig. 6, wherein a voltage measurement module is arranged in the voltage acquisition interface circuit, the voltage measurement module can use an ADC chip to perform analog-to-digital conversion, digital signals are transmitted to a processor to be processed, and a programmable voltmeter can be adopted to directly transmit measured voltage values to the processor to be used.
The voltage acquisition interface circuit in fig. 6 is also actually a current acquisition interface circuit, and a hall sensor (i.e., a hall current sensor) is disposed on the current acquisition interface circuit and is used for detecting a current in the charge-discharge loop and transmitting a current signal to the processor; in other embodiments, the current collection interface circuit may further include a current divider, and the ADC chip is used in cooperation with the current collection interface circuit, and the ADC chip performs analog-to-digital conversion on the voltage signal of the current divider, and the digital signal may be calculated by the processor according to the resistance of the current divider to obtain the current value.
In addition, the processor in this embodiment and system embodiment 1 may be a microprocessor, such as an ARM, or a programmable chip, such as an FPGA, a DSP, or the like.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (8)
1. A system for testing electrical connections within a battery system, the system comprising:
the testing equipment comprises a processor, wherein the processor is connected with a voltage and current acquisition interface circuit, and the voltage and current acquisition interface circuit is used for sampling and connecting the positive and negative output ends of the battery system to be tested so as to obtain the voltage and current of the positive and negative output ends of the battery system to be tested;
the processor is connected with a communication interface circuit, is used for being in communication connection with a battery management system in the battery system to be tested, is used for acquiring the voltage of each battery in the battery system to be tested, and calculates the internal resistance value of the electrical connection in the battery system to be tested by combining the voltage and the current of the positive and negative output ends of the battery system to be tested so as to judge the quality of the electrical connection in the battery system to be tested;
the test equipment further comprises a charge-discharge module, the charge-discharge module is connected with the voltage and current acquisition interface circuit, and the charge-discharge module is used for charging or discharging the battery in the battery system to be tested through the voltage and current acquisition interface circuit.
2. The system for testing electrical connections in a battery system according to claim 1, wherein the internal resistance value of the electrical connection in the battery system under test is calculated as follows:
in the formula, DCRElectric applianceIs the internal resistance, I, of the electrical connections in the battery system under test0Is the current at the positive and negative output terminals of the battery system to be tested at the first detection moment I1Is positive of the battery system to be tested at the second detection moment,Current at the negative output terminal, U0Corresponding to the voltages of the positive and negative output ends of the battery system to be detected at the first detection moment, U1The second detection moment corresponds to the voltages of the positive and negative output ends of the battery system to be detected,
for the voltage of the individual cells in the battery system under test at the first test moment,
and n is the voltage of each battery in the battery system to be tested at the second detection moment, and the number of the batteries in the battery system to be tested.
3. The system for testing electrical connections in a battery system according to claim 1 or 2, wherein the voltage and current acquisition interface circuit comprises a voltage acquisition interface circuit and a current acquisition interface circuit, wherein the current acquisition interface circuit is connected with a hall current sensor, and the hall current sensor is used for detecting and connecting the output end of the battery system to be tested.
4. The system for testing electrical connection in a battery system according to claim 1, wherein a communication line is connected between the charge and discharge module and the processor in the testing device, and the processor is configured to send a command to stop charging and discharging the charge and discharge module through the communication line when detecting that the battery system or the charge and discharge module to be tested is abnormal.
5. A system for testing electrical connections within a battery system, the system comprising:
the testing equipment comprises a processor, wherein the processor is connected with a voltage and current acquisition interface circuit, and the voltage and current acquisition interface circuit is used for sampling and connecting the positive and negative output ends of the battery system to be tested so as to obtain the voltage and current of the positive and negative output ends of the battery system to be tested;
the processor is connected with a communication interface circuit, is used for being in communication connection with a battery management system in the battery system to be tested, is used for acquiring the voltage of each battery in the battery system to be tested, and calculates the internal resistance value of the electrical connection in the battery system to be tested by combining the voltage and the current of the positive and negative output ends of the battery system to be tested so as to judge the quality of the electrical connection in the battery system to be tested;
the testing equipment is provided with a charge-discharge input interface used for being connected with charge-discharge equipment, and the charge-discharge input interface is connected with the voltage and current acquisition interface circuit.
6. The system for testing electrical connections in a battery system according to claim 5, wherein the internal resistance value of the electrical connections in the battery system under test is calculated as follows:
in the formula, DCRElectric applianceIs the internal resistance, I, of the electrical connections in the battery system under test0Is the current at the positive and negative output terminals of the battery system to be tested at the first detection moment I1For the current at the positive and negative output terminals of the battery system to be tested at the second detection moment, U0Corresponding to the voltages of the positive and negative output ends of the battery system to be detected at the first detection moment, U1The second detection moment corresponds to the voltages of the positive and negative output ends of the battery system to be detected,
for the voltage of the individual cells in the battery system under test at the first test moment,
for the voltage of each battery in the battery system to be tested at the second detection moment, n is the voltage of each battery in the battery system to be testedThe number of cells in the battery.
7. The system for testing electrical connections in a battery system according to claim 5 or 6, wherein the voltage and current acquisition interface circuit comprises a voltage acquisition interface circuit and a current acquisition interface circuit, wherein the current acquisition interface circuit is connected with a Hall current sensor, and the Hall current sensor is used for detecting and connecting the output end of the battery system to be tested.
8. The system for testing electrical connection in a battery system according to claim 5, wherein the processor is connected with a communication line for connecting the charging and discharging device, and the processor is configured to send a command for stopping charging and discharging to the charging and discharging module through the communication line when detecting that the battery system or the charging and discharging module to be tested has an abnormal condition.
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| CN113960500A (en) * | 2021-08-24 | 2022-01-21 | 欣旺达电子股份有限公司 | Detection circuit, detection system and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960500A (en) * | 2021-08-24 | 2022-01-21 | 欣旺达电子股份有限公司 | Detection circuit, detection system and detection method |
| CN113960500B (en) * | 2021-08-24 | 2024-03-22 | 欣旺达电子股份有限公司 | Detection circuit, detection system and detection method |
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