CN220913246U - Battery management system test control circuit - Google Patents
Battery management system test control circuit Download PDFInfo
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- CN220913246U CN220913246U CN202322343446.1U CN202322343446U CN220913246U CN 220913246 U CN220913246 U CN 220913246U CN 202322343446 U CN202322343446 U CN 202322343446U CN 220913246 U CN220913246 U CN 220913246U
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Abstract
The utility model discloses a battery management system test control circuit, which judges whether the voltage polarity of a battery cell voltage is correct or not through a voltage polarity judging unit, judges whether the voltage value of the battery cell voltage is in a preset voltage range or not through a voltage value judging unit, and switches on a target battery cell module channel and a battery management system through a switch unit only when the voltage polarity of the battery cell voltage is correct and the voltage value is in the preset voltage range, so that the protection of a BMS and test equipment is realized, and the safety of the BMS and the test equipment in the test process is improved.
Description
Technical Field
The application relates to the technical field of power batteries, in particular to a battery management system test control circuit.
Background
BMS (Battery MANAGEMENT SYSTEM) is used for intelligent management and maintenance of each Battery unit, prevents overcharge and overdischarge of the Battery, prolongs the service life of the Battery, and monitors the state of the Battery.
To ensure the quality of the BMS, a large number of tests are required. HIL (HARDWARE IN THE loop, hardware in loop test) test is an indispensable loop, and in the prior art, HIL test wire harnesses are made manually, often because of short circuit or misconnection of a battery cell voltage acquisition line, a BMS main board is burnt out, and even test equipment is damaged.
Therefore, how to provide a battery management system test control circuit to improve the safety of BMS and test devices during testing is a technical problem to be solved at present.
Disclosure of utility model
The embodiment of the application provides a battery management system test control circuit which is used for improving the safety of BMS and test equipment during testing.
The circuit comprises:
The voltage polarity judging unit is used for comparing the cell voltage of the target cell module channel with the reference voltage of the reference analog channel and outputting a polarity correct signal when the polarity of the cell voltage is correct; the voltage value judging unit is used for outputting a voltage value normal signal when the voltage of the battery cell is in a preset voltage range; the switch unit is used for controlling a control relay between the target cell module channel and the battery management system to be closed when the signal with correct polarity and the signal with normal voltage value are received, so that the cell voltage is input to the battery management system, and the battery management system is tested; the first end of the voltage polarity judging unit and the first end of the voltage value judging unit are connected with the target battery cell module channel, the second end of the voltage polarity judging unit is connected with the reference analog channel, the third end of the voltage polarity judging unit is connected with the first end of the switching unit, the second end of the voltage value judging unit is connected with the second end of the switching unit, the third end of the voltage value judging unit is connected with the fourth end of the voltage polarity judging unit, and a coil of the control relay is connected in series between the third end and the fourth end of the switching unit.
In some embodiments, the target cell module channel and the reference analog channel are two analog channels determined from a plurality of preset cell module channels, each voltage value output by each preset cell module channel is in an equal difference sequence, the number of the battery management system test control circuits is multiple, and each battery management system test control circuit is respectively connected with a different target cell module channel and a reference channel.
In some embodiments, the voltage polarity determining unit includes a first comparator, a first operational amplifier, a first resistor, a first diode, a second resistor, a third resistor and a fourth resistor, where a positive input end of the first comparator is a first end of the voltage polarity determining unit, a negative input end of the first comparator is a second end of the voltage polarity determining unit, positive power supply ends of the first comparator and the first operational amplifier are connected to a preset power supply, an output end of the first comparator is connected to one end of the first resistor, another end of the first resistor, an anode of the first diode and one end of the second resistor are connected to a fourth end of the voltage polarity determining unit, another end of the second resistor and one end of the third resistor are connected to a positive input end of the first operational amplifier, another end of the third resistor and an output end of the first operational amplifier are connected to a third end of the voltage polarity determining unit, one end of the fourth resistor is connected to a negative input end of the first operational amplifier and a negative end of the second resistor is connected to a negative end of the first diode and a negative end of the fourth resistor, and the negative end of the fourth resistor is connected to the negative end of the first diode is connected to the negative power supply.
In some embodiments, the voltage value determination unit includes: the comparison subunit is used for comparing the battery cell voltage with the preset voltage range and outputting a comparison signal; the amplifying subunit is used for amplifying the comparison signal into a judging signal, wherein the judging signal is a normal voltage value signal when the battery cell voltage is in the preset voltage range, and the judging signal is an abnormal voltage value signal when the battery cell voltage exceeds the preset voltage range; the first end of the comparison subunit is the first end of the voltage value judging unit, the second end of the comparison subunit is the third end of the voltage value judging unit, the third end of the comparison subunit is connected with the first end of the amplifying subunit, and the second end of the amplifying subunit is the second end of the voltage value judging unit.
In some embodiments, the comparing subunit includes a second comparator, a third comparator, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a third diode, a fourth diode, a fifth diode, a sixth diode, a first triode, and a second triode, wherein one end of the sixth resistor and one end of the thirteenth resistor are commonly connected to a first end of the comparing subunit, the other end of the sixth resistor is connected to a positive input end of the second comparator, one end of the fifth resistor is connected to a preset power supply, the other end of the fifth resistor and one end of the seventh resistor are commonly connected to a negative input end of the second comparator, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to a negative source end of the second comparator, an output end of the second comparator is connected to the ninth resistor, one end of the thirteenth resistor is connected to a negative source end of the ninth resistor, one end of the thirteenth resistor is connected to the other end of the eleventh resistor, the other end of the tenth resistor is connected to the other end of the eleventh resistor, the other end of the eleventh resistor is connected to the negative source, the other end of the eleventh resistor is connected to the other end of the tenth resistor is connected to the negative source, the output end of the third comparator is connected with one end of the fourteenth resistor, the other end of the fourteenth resistor and the anode of the fifth diode are connected with the base electrode of the second triode, the cathode of the fifth diode is connected with the cathode of the sixth diode, the collector of the first triode is connected with the second end of the comparison subunit, the emitter of the first triode is connected with the collector of the second triode, the emitter of the second triode is the third end of the comparison subunit, the positive power supply ends of the second comparator and the third comparator are connected with the preset power supply, and the negative power supply ends of the second comparator and the third comparator are grounded through a first capacitor.
In some embodiments, the circuit further includes a fifteenth resistor, a manual switch, a first relay and a second relay, one end of the fifteenth resistor is connected with a preset power supply, the other end of the fifteenth resistor is connected with one end of the manual switch, the other end of the manual switch is connected with one end of a coil of the first relay and one end of a coil of the second relay, two ends of a contact of the first relay are respectively connected with two ends of the seventh resistor, two ends of a contact of the second relay are respectively connected with two ends of the eleventh resistor, and the other end of the coil of the first relay and the other end of the coil of the second relay are grounded.
In some embodiments, the amplifying subunit includes a second operational amplifier, a sixteenth resistor, a seventeenth resistor and an eighteenth resistor, one end of the sixteenth resistor is a first end of the amplifying subunit, the other end of the sixteenth resistor and one end of the eighteenth resistor are connected to a positive input end of the second operational amplifier, one end of the seventeenth resistor is grounded through the first capacitor, the other end of the seventeenth resistor is connected to a negative input end of the second operational amplifier, and the other ends of the second operational amplifier and the eighteenth resistor are commonly connected to a second end of the amplifying subunit.
In some embodiments, the switch unit includes a third relay and a fourth relay, one end of a coil of the third relay is a first end of the switch unit, one end of a contact of the third relay is connected with a preset power supply, the other end of the contact of the third relay is a third end of the switch unit, the other end of the coil of the third relay and one end of the coil of the fourth relay are grounded through a second capacitor, the other end of the coil of the fourth relay is a second end of the switch unit, one end of the contact of the fourth relay is a fourth end of the switch unit, and the other end of the contact of the fourth relay is grounded through the first capacitor.
In some embodiments, the circuit further comprises: the indicating unit is used for sending out a first signal when receiving the polarity error signal and sending out a second signal when receiving the voltage value abnormal signal; the first end of the indicating unit is connected with the third end of the voltage polarity judging unit, the second end of the indicating unit is connected with the second end of the voltage value judging unit, the polarity error signal is output by the voltage polarity judging unit when the polarity of the battery cell voltage is wrong, and the voltage value abnormal signal is output by the voltage value judging unit when the battery cell voltage exceeds the preset voltage range.
In some embodiments, the indication unit includes a first indication lamp, a second indication lamp, a fifth relay, a sixth relay, a nineteenth resistor and a twentieth resistor, one end of a coil of the fifth relay is a first end of the indication unit, two ends of a contact of the fifth relay are respectively connected with two ends of the first indication lamp, one end of the first indication lamp is connected with one end of the nineteenth resistor, the other end of the nineteenth resistor is connected with a preset power supply, the other end of the first indication lamp and one end of the twentieth resistor are grounded, the other end of the twentieth resistor is connected with one end of the second indication lamp, the other end of the second indication lamp is connected with the preset power supply, one end of the coil of the sixth relay and the other end of the coil of the fifth relay are grounded, two ends of the contact of the sixth relay are respectively connected with two ends of the second indication lamp, and when the first indication lamp is turned on, the second indication lamp emits the second signal when turned on.
By applying the above technical scheme, the battery management system test control circuit includes: the voltage polarity judging unit is used for comparing the cell voltage of the target cell module channel with the reference voltage of the reference analog channel and outputting a polarity correct signal when the polarity of the cell voltage is correct; the voltage value judging unit is used for outputting a voltage value normal signal when the voltage of the battery cell is in a preset voltage range; and the switch unit is used for controlling the control relay between the target battery cell module channel and the battery management system to be closed when receiving the signal with correct polarity and the signal with normal voltage value, so that the battery cell voltage is input into the battery management system, and the battery management system is tested, thereby realizing the protection of the BMS and the testing equipment and improving the safety of the BMS and the testing equipment in the testing process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery management system test control circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of the wiring principle of testing a battery management system in an embodiment of the utility model;
Fig. 3 is a schematic structural diagram of a battery management system test control circuit according to another embodiment of the present utility model;
Fig. 4 is a schematic structural diagram of a battery management system test control circuit according to another embodiment of the present utility model;
Fig. 5 is a schematic diagram showing a battery management system test control circuit according to another embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
An embodiment of the present application provides a battery management system test control circuit, as shown in fig. 1, including:
The voltage polarity judging unit 10 is used for comparing the cell voltage of the target cell module channel with the reference voltage of the reference analog channel, and outputting a polarity correct signal when the polarity of the cell voltage is correct;
A voltage value determining unit 20, configured to output a voltage value normal signal when the cell voltage is in a preset voltage range;
the switch unit 30 is used for controlling the control relay K between the target cell module channel and the battery management system to be closed when receiving the signal with correct polarity and the signal with normal voltage value, so that the cell voltage is input into the battery management system to test the battery management system;
The first end of the voltage polarity determining unit 10 and the first end of the voltage value determining unit 20 are connected with a target cell module channel, the second end of the voltage polarity determining unit 10 is connected with a reference analog channel, the third end of the voltage polarity determining unit 10 is connected with the first end of the switching unit 30, the second end of the voltage value determining unit 20 is connected with the second end of the switching unit 30, the third end of the voltage value determining unit 20 is connected with the fourth end of the voltage polarity determining unit 10, and a coil of the control relay K is connected in series between the third end and the fourth end of the switching unit 30.
In this embodiment, the target cell module channel may be an HIL cell module channel on the test device, and a control relay K is disposed between the target cell module channel and the battery management system, where the control relay K is controlled by the battery management system test control circuit. When the battery management system is tested through the target battery cell module channel, the control relay K needs to be closed first to output the battery cell voltage of the target battery cell module channel to the battery management system so as to test the battery management system.
Before the control relay K is closed, the cell voltage of the target cell module is input into the voltage polarity determining unit 10 and the voltage value determining unit 20 respectively, the reference voltage of the reference analog channel is input into the voltage polarity determining unit 10, the voltage polarity determining unit 10 compares the cell voltage with the reference voltage, the reference analog channel can be an analog channel with output voltage lower than the target cell module, when the cell voltage of the target cell module is higher than the reference voltage of the reference analog channel, the voltage polarity determining unit 10 outputs a polarity correct signal to the switching unit 30, the voltage value determining unit 20 determines whether the cell voltage is in a preset voltage range, if so, the voltage value determining unit 20 outputs a voltage value normal signal to the switching unit 30. When receiving the signal with correct polarity and the signal with normal voltage value, the switch unit 30 closes the control relay K to input the voltage of the battery cell to the battery management system, and tests the battery management system.
In this embodiment, before the target cell module is connected to the battery management system, the voltage polarity determining unit 10 determines whether the voltage polarity of the cell voltage is correct, and the voltage value determining unit 20 determines whether the voltage value of the cell voltage is in a preset voltage range, and when the voltage polarity of the cell voltage is correct and the voltage value is in the preset voltage range, the switch unit 30 is used to connect the target cell module to the battery management system, so that protection of the BMS and the test device is achieved, and safety of the BMS and the test device in the test process is improved.
It is understood that if the switching unit 30 does not receive the polarity correct signal and the voltage value normal signal or receives only one of the polarity correct signal and the voltage value normal signal, the switching unit 30 does not close the control relay K.
Alternatively, the reference analog channel may be an analog channel whose output voltage is higher than that of the target cell analog channel, in which case the voltage polarity determining unit 10 outputs the polarity correct signal to the switching unit 30 when the cell voltage of the target cell analog channel is lower than the reference voltage of the reference analog channel.
In some embodiments of the present application, the target cell module channel and the reference analog channel are two analog channels determined from a plurality of preset cell module channels, each voltage value output by each preset cell module channel is in an equal difference sequence, the number of the battery management system test control circuits is a plurality, and each battery management system test control circuit is respectively connected with a different target cell module channel and a different reference channel.
In this embodiment, a plurality of preset cell module channels are provided, and when the battery management system is tested, two analog channels are selected each time and used as the target cell module channel and the reference analog channel respectively, so that whether the wiring of each preset cell module channel is correct can be detected sequentially. The voltage values output by each preset cell module channel are in an equal difference sequence, and the voltage difference between adjacent preset cell module channels can be the cell voltage of a single cell. The number of the battery management system test control circuits is multiple, different battery management system test control circuits are connected with different target battery cell module channels and reference channels, and the preset voltage range is determined by the voltage difference between the target battery cell module channels and the reference channels. The test control circuits of different battery management systems can use the same preset voltage range, or can use different preset voltage ranges, and a person skilled in the art can determine a target cell module channel and a reference channel which are connected to the test control circuit of the battery management system according to the requirement of a test item, and set a corresponding preset voltage range for the voltage value judging unit 20.
For example, as shown in fig. 2, the HIL Cell channels include four preset Cell channels, cell- (representing the negative electrode), cell_1, cell_2, and cell_3, and the output voltages of cell_1, cell_2, and cell_3 are sequentially increased and in an equal difference sequence.
When the cell_1 and the BMS need to be connected, the cell_1 is used as a target Cell module channel, the Cell-is used as a reference simulation channel to be connected with a battery management system test control circuit, when the cell_2 and the BMS need to be connected, the cell_2 is used as a target Cell module channel, the cell_1 is used as a reference simulation channel to be connected with another battery management system test control circuit, and the like, at the moment, preset voltage ranges corresponding to different battery management system test control circuits are consistent, and the preset voltage ranges are determined by voltage differences between two adjacent preset Cell module channels.
Alternatively, when cell_2 and BMS are connected, cell_2 may be used as a target Cell model channel, and Cell-may be used as a reference analog channel and connected to a battery management system test control circuit, where the preset voltage range corresponding to the battery management system test control circuit is determined by the voltage difference between Cell-and cell_2.
In order to improve the reliability of the voltage polarity determining unit 10, in some embodiments of the present application, as shown in fig. 5, the voltage polarity determining unit 10 includes a first comparator A1, a first operational amplifier A2, a first resistor R1, a first diode D1, a second diode D2, a second resistor R2, a third resistor R3, and a fourth resistor R4, wherein,
The positive input end of the first comparator A1 is the first end of the voltage polarity judging unit 10, the negative input end of the first comparator A1 is the second end of the voltage polarity judging unit 10, the positive power ends of the first comparator A1 and the first operational amplifier A2 are connected with a preset power supply, the output end of the first comparator A1 is connected with one end of the first resistor R1, the other end of the first resistor R1, the anode of the first diode D1 and one end of the second resistor R2 are connected with the fourth end of the voltage polarity judging unit 10, the other end of the second resistor R2 and one end of the third resistor R3 are connected with the positive input end of the first operational amplifier A2, the other end of the third resistor R3 and the output end of the first operational amplifier A2 are connected with the third end of the voltage polarity judging unit 10, one end of the fourth resistor R4 is connected with the negative input end of the first operational amplifier A2, the cathode of the first diode D1 is connected with the cathode of the second diode D2, the negative power end of the first comparator A1 and the anode of the second diode D2 are connected with the fourth end of the first capacitor C1 and the second capacitor C2 are connected with the second capacitor C2 and the fourth end of the fourth capacitor C2.
Alternatively, the preset power source may be a 12V power source.
In order to improve the reliability of the voltage value determining unit 20, in some embodiments of the present application, as shown in fig. 3, the voltage value determining unit 20 includes:
a comparing subunit 21, configured to compare the cell voltage with a preset voltage range and output a comparison signal;
an amplifying subunit 22, configured to amplify the comparison signal into a determination signal, where the determination signal is a voltage value normal signal when the voltage of the battery cell is in the preset voltage range, and the determination signal is a voltage value abnormal signal when the voltage of the battery cell exceeds the preset voltage range;
The first end of the comparing subunit 21 is the first end of the voltage value determining unit 20, the second end of the comparing subunit 21 is the third end of the voltage value determining unit 20, the third end of the comparing subunit 21 is connected to the first end of the amplifying subunit 22, and the second end of the amplifying subunit 22 is the second end of the voltage value determining unit 20.
In order to improve the reliability of the comparing subunit 21, in some embodiments of the present application, as shown in fig. 5, the comparing subunit 21 includes a second comparator A3, a third comparator A4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a first triode Q1, and a second triode Q2, wherein,
One end of a sixth resistor R6 and one end of a thirteenth resistor R13 are connected with the first end of the comparison subunit 21, the other end of the sixth resistor R6 is connected with the positive input end of the second comparator A3, one end of a fifth resistor R5 is connected with a preset power supply, the other end of the fifth resistor R5 and one end of a seventh resistor R7 are connected with the negative input end of the second comparator A3, the other end of the seventh resistor R7 is connected with one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with the negative power supply end of the second comparator A3, the output end of the second comparator A3 is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 and the anode of the third diode D3 are connected with the base electrode of the first triode Q1, the cathode of the third diode D3 is connected with the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected with the negative power supply end of the second comparator A3, one end of the tenth resistor R10 is connected with the preset power supply, the other end of the tenth resistor R10 and one end of the eleventh resistor R11 are commonly connected with the positive input end of the third comparator A4, the other end of the eleventh resistor R11 is connected with one end of the twelfth resistor R12, the other end of the twelfth resistor R12 and the anode of the sixth diode D6 are connected with the negative power supply end of the third comparator A4, the other end of the thirteenth resistor R13 is connected with the negative input end of the third comparator A4, the output end of the third comparator A4 is connected with one end of the fourteenth resistor R14, the other end of the fourteenth resistor R14 and the anode of the fifth diode D5 are commonly connected with the base of the second triode Q2, the cathode of the fifth diode D5 is connected with the cathode of the sixth diode D6, the emitter of the first triode Q1 is connected with the collector of the second triode Q2, the emitter of the second triode Q2 is the third end of the comparison subunit 21, the positive power supply ends of the second comparator A3 and the third comparator A4 are connected with a preset power supply, and the negative power supply ends of the second comparator A3 and the third comparator A4 are grounded through a first capacitor C1.
In this embodiment, the second comparator A3 is configured to compare the cell voltage with a low voltage limit of a preset voltage range, and the third comparator A4 is configured to compare the cell voltage with a high voltage limit of the preset voltage range, so as to accurately determine whether the cell voltage is in the preset voltage range.
In some embodiments of the present application, as shown in fig. 5, the circuit further includes a fifteenth resistor R15, a manual switch S1, a first relay K1 and a second relay K2, one end of the fifteenth resistor R15 is connected to a preset power source, the other end of the fifteenth resistor R15 is connected to one end of the manual switch S1, the other end of the manual switch S1 is connected to one end of a coil of the first relay K1 and one end of a coil of the second relay K2, two ends of a contact of the first relay K1 are respectively connected to two ends of a seventh resistor R7, two ends of a contact of the second relay K2 are respectively connected to two ends of an eleventh resistor R11, and the other end of the coil of the first relay K1 and the other end of the coil of the second relay K2 are grounded.
In this embodiment, by setting the manual switch S1, the first relay K1 and the second relay K2, after the manual switch S1 is closed, the user can close the first relay K1 and the second relay K2, so as to change the threshold voltages of the second comparator A3 and the third comparator A4, realize the modulation of the preset voltage range, and improve the flexibility of the circuit.
In order to improve the reliability of the amplifying subunit 22, in some embodiments of the present application, as shown in fig. 5, the amplifying subunit 22 includes a second operational amplifier A5, a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18, one end of the sixteenth resistor R16 is a first end of the amplifying subunit 22, the other end of the sixteenth resistor R16 and one end of the eighteenth resistor R18 are connected to the positive input end of the second operational amplifier A5, one end of the seventeenth resistor R17 is grounded through a first capacitor C1, the other end of the seventeenth resistor R17 is connected to the negative input end of the second operational amplifier A5, and the output end of the second operational amplifier A5 and the other end of the eighteenth resistor R18 are commonly connected to the second end of the amplifying subunit 22.
In order to improve the reliability of the switch unit 30, in some embodiments of the present application, as shown in fig. 5, the switch unit 30 includes a third relay K3 and a fourth relay K4, one end of a coil of the third relay K3 is a first end of the switch unit 30, one end of a contact of the third relay K3 is connected to a preset power supply, the other end of a contact of the third relay K3 is a third end of the switch unit 30, the other end of a coil of the third relay K3 and one end of a coil of the fourth relay K4 are grounded via a second capacitor C2, the other end of a coil of the fourth relay K4 is a second end of the switch unit 30, one end of a contact of the fourth relay K4 is a fourth end of the switch unit 30, and the other end of a contact of the fourth relay K4 is grounded via a first capacitor C1.
In some embodiments of the application, as shown in fig. 4, the circuit further comprises:
An indication unit 40 for sending out a first signal when a polarity error signal is received and a second signal when a voltage value abnormality signal is received;
The first end of the indication unit 40 is connected to the third end of the voltage polarity determination unit 10, the second end of the indication unit 40 is connected to the second end of the voltage value determination unit 20, the polarity error signal is output by the voltage polarity determination unit 10 when the polarity of the cell voltage is wrong, and the voltage value abnormal signal is output by the voltage value determination unit 20 when the cell voltage exceeds the preset voltage range.
In this embodiment, by setting the indication unit 40, the first signal and/or the second signal can be sent out when the wiring is abnormal, thereby reminding an operator to perform error checking in time and improving the working efficiency.
In order to improve the reliability of the indication unit 40, in some embodiments of the present application, as shown in fig. 5, the indication unit 40 includes a first indication lamp L1, a second indication lamp L2, a fifth relay K5, a sixth relay K6, a nineteenth resistor R19, and a twenty-first resistor R20, one end of a coil of the fifth relay K5 is a first end of the indication unit 40, two ends of a contact of the fifth relay K5 are respectively connected to two ends of the first indication lamp L1, one end of the first indication lamp L1 is connected to one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected to a preset power supply, the other end of the first indication lamp L1 and one end of the twenty-first resistor R20 are grounded, the other end of the twenty-first resistor R20 is connected to one end of the second indication lamp L2, the other end of the coil of the sixth relay K6 and the other end of the coil of the fifth relay K5 are grounded, the other end of the coil of the sixth relay K6 is a second end of the indication unit 40, and when the second contact of the sixth relay K6 is connected to two ends of the first indication lamp L2 are turned on, and when the first indication lamp L2 is turned on, respectively, the first indication lamp L2 is turned on.
Optionally, the first indicator light L1 and the second indicator light L2 may be replaced by a first buzzer and a second buzzer, respectively, where the first buzzer and the second buzzer emit different sounds, so as to also play a role in reminding an operator.
The battery management system test control circuit in the embodiment of the application comprises: the voltage polarity judging unit is used for comparing the cell voltage of the target cell module channel with the reference voltage of the reference analog channel and outputting a polarity correct signal when the polarity of the cell voltage is correct; the voltage value judging unit is used for outputting a voltage value normal signal when the voltage of the battery cell is in a preset voltage range; and the switching unit is used for controlling the control relay between the target cell module channel and the battery management system to be closed when receiving the polarity correct signal and the voltage value normal signal so as to enable the cell voltage to be input into the battery management system, testing the battery management system, judging whether the voltage polarity of the cell voltage is correct or not through the voltage polarity judging unit before connecting the target cell module channel and the battery management system, judging whether the voltage value of the cell voltage is in a preset voltage range or not through the voltage value judging unit, and connecting the target cell module channel and the battery management system through the switching unit when the voltage polarity of the cell voltage is correct and the voltage value is in the preset voltage range, thereby realizing the protection of the BMS and the testing equipment and improving the safety of the BMS and the testing equipment in the testing process.
In order to further explain the technical idea of the utility model, the technical scheme of the utility model is described with specific application scenarios.
The embodiment of the application provides a battery management system test control circuit, as shown in fig. 2, if a target Cell module channel is cell_1 and a reference analog channel is Cell-, as shown in fig. 5, the working principle of the corresponding battery management system test control circuit is as follows:
The first comparator A1 checks whether the voltage polarity of the cell_1 voltage is correct. Specifically, the Cell- (i.e., reference voltage) and the cell_1 voltage (i.e., cell voltage) are respectively input into the first comparator A1, the first comparator A1 outputs +5v or-5V voltage according to the input voltages of the two input ends, and the output voltage of the first comparator A1 is output according to the following rule:
(1) When the positive terminal voltage of the first comparator A1 is higher than the negative terminal voltage, the first comparator A1 outputs +5v voltage.
(2) When the negative terminal voltage of the first comparator A1 is higher than the positive terminal voltage, the first comparator A1 outputs a voltage of-5V.
The output voltage of the first comparator A1 is input into the first operational amplifier A2, the first operational amplifier A2 performs power amplification, and when the first comparator A1 outputs +5V voltage, the third relay K3 and the fifth relay K5 can be driven to be closed. The third relay K3 needs to act simultaneously with the fourth relay K4, and the fifth relay K5 is used for controlling the normally dark red light (i.e. the first indicator light L1). The red light control rule is as follows:
(1) When the cell_1 voltage is greater than the Cell-voltage, the red light is not lit.
(2) When the cell_1 voltage is less than the Cell-voltage, the red light is on.
Meanwhile, the cell_1 voltage enters the second comparator A3 and the third comparator A4, respectively, and the lower limit voltage and the upper limit voltage are compared respectively. When the voltage of the cell_1 is within the preset voltage range corresponding to the second comparator A3 and the third comparator A4, the second comparator A3 and the third comparator A4 output +5v voltage at the same time, so as to drive the first triode Q1 and the second triode Q2 to be closed, thereby enabling the second operational amplifier A5 to output voltage, and further driving the fourth relay K4 and the sixth relay K6 to be closed. The sixth relay K6 controls the lighting of the yellow lamp (i.e., the second indicator lamp L2) according to the following rule:
(1) When the cell_1 voltage is within the preset voltage range, the yellow lamp is not lighted.
(2) When the cell_1 voltage is not within the preset voltage range, the yellow lamp is turned on.
When the third relay K3 and the fourth relay K4 are closed at the same time, the coil of the control relay K is electrified, the contact of the control relay K is driven to be closed, the cell_1 and the BMS are conducted, and the cell_1 voltage is input into the BMS, so that the test is completed. Otherwise, the contact of the control relay K is always opened, and the cell_1 voltage cannot be input into the BMS.
The manual switch S1 can be controlled by a test engineer, and the on-off of the manual switch S1 can control the on-off of the first relay K1 and the second relay K2, so that the comparison reference of the second comparator A3 and the third comparator A4 is changed, and whether the voltage of the cell_1 is in different ranges can be measured.
According to the battery management system test control circuit, whether the battery cell voltage is correct or not and whether the battery cell voltage is within a reasonable range or not is judged in advance, whether the BMS acquisition line is connected with the battery cell voltage of the test equipment or not is controlled, the BMS main board and the test equipment are prevented from being burnt, protection of the BMS and the test equipment is achieved, meanwhile, an error indicator lamp is designed, operators can be prompted to conduct error checking, and working efficiency is improved.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of the utility model, "a plurality" means two or more, unless otherwise specifically and clearly defined.
In the present utility model, unless explicitly specified and limited otherwise, the terms "access", "connected", and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.
Claims (10)
1. A battery management system test control circuit, the circuit comprising:
The voltage polarity judging unit is used for comparing the cell voltage of the target cell module channel with the reference voltage of the reference analog channel and outputting a polarity correct signal when the polarity of the cell voltage is correct;
The voltage value judging unit is used for outputting a voltage value normal signal when the voltage of the battery cell is in a preset voltage range;
The switch unit is used for controlling a control relay between the target cell module channel and the battery management system to be closed when the signal with correct polarity and the signal with normal voltage value are received, so that the cell voltage is input to the battery management system, and the battery management system is tested;
The first end of the voltage polarity judging unit and the first end of the voltage value judging unit are connected with the target battery cell module channel, the second end of the voltage polarity judging unit is connected with the reference analog channel, the third end of the voltage polarity judging unit is connected with the first end of the switching unit, the second end of the voltage value judging unit is connected with the second end of the switching unit, the third end of the voltage value judging unit is connected with the fourth end of the voltage polarity judging unit, and a coil of the control relay is connected in series between the third end and the fourth end of the switching unit.
2. The circuit of claim 1 wherein the target cell module channel and the reference analog channel are two analog channels determined from a plurality of preset cell module channels, each voltage value output by each preset cell module channel is in an equal difference sequence, the number of battery management system test control circuits is multiple, and each battery management system test control circuit is respectively connected with a different target cell module channel and a reference channel.
3. The circuit of claim 1, wherein the voltage polarity determination unit comprises a first comparator, a first op-amp, a first resistor, a first diode, a second resistor, a third resistor, and a fourth resistor, wherein,
The positive input end of the first comparator is the first end of the voltage polarity judging unit, the negative input end of the first comparator is the second end of the voltage polarity judging unit, the positive power ends of the first comparator and the first operational amplifier are connected with a preset power supply, the output end of the first comparator is connected with one end of the first resistor, the other end of the first resistor, the anode of the first diode and one end of the second resistor are connected with the fourth end of the voltage polarity judging unit, the other end of the second resistor and one end of the third resistor are connected with the positive input end of the first operational amplifier, the other end of the third resistor and the output end of the first operational amplifier are connected with the third end of the voltage polarity judging unit, one end of the fourth resistor is connected with the negative input end of the first operational amplifier, the cathode of the first diode is connected with the cathode of the second diode, the source end of the first comparator and the anode of the second diode are connected with the first capacitor and the second capacitor are connected with the negative end of the first capacitor and the fourth capacitor.
4. The circuit according to claim 1, wherein the voltage value determination unit includes:
The comparison subunit is used for comparing the battery cell voltage with the preset voltage range and outputting a comparison signal;
The amplifying subunit is used for amplifying the comparison signal into a judging signal, wherein the judging signal is a normal voltage value signal when the battery cell voltage is in the preset voltage range, and the judging signal is an abnormal voltage value signal when the battery cell voltage exceeds the preset voltage range;
the first end of the comparison subunit is the first end of the voltage value judging unit, the second end of the comparison subunit is the third end of the voltage value judging unit, the third end of the comparison subunit is connected with the first end of the amplifying subunit, and the second end of the amplifying subunit is the second end of the voltage value judging unit.
5. The circuit of claim 4, wherein the comparison subunit comprises a second comparator, a third comparator, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a third diode, a fourth diode, a fifth diode, a sixth diode, a first triode, and a second triode, wherein,
One end of the sixth resistor and one end of the thirteenth resistor are commonly connected to the first end of the comparator unit, the other end of the sixth resistor is connected to the positive input end of the second comparator, one end of the fifth resistor is connected to a preset power supply, the other end of the fifth resistor and one end of the seventh resistor are commonly connected to the negative input end of the second comparator, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the negative power supply end of the second comparator, the output end of the second comparator is connected to one end of the ninth resistor, the other end of the ninth resistor and the anode of the third diode are connected to the base of the first triode, the cathode of the third diode is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to the negative power supply end of the second comparator, one end of the tenth resistor is connected to the preset power supply, the other end of the eighth resistor and one end of the eleventh resistor are commonly connected to the negative input end of the third comparator, the anode of the fourth resistor is connected to the other end of the fourth comparator, the other end of the fourth resistor is connected to the negative input end of the fourth comparator, the fourth resistor is connected to the fourth resistor, the other end of the fourth comparator is connected to the fourth resistor is connected to the negative end of the fourth comparator, the fourth comparator is connected to the negative end of the fourth comparator, the emitter of the first triode is connected with the collector of the second triode, the emitter of the second triode is the third end of the comparison subunit, the positive power supply ends of the second comparator and the third comparator are connected with the preset power supply, and the negative power supply ends of the second comparator and the third comparator are grounded through a first capacitor.
6. The circuit of claim 5, further comprising a fifteenth resistor, a manual switch, a first relay and a second relay, wherein one end of the fifteenth resistor is connected with a preset power supply, the other end of the fifteenth resistor is connected with one end of the manual switch, the other end of the manual switch is connected with one end of a coil of the first relay and one end of a coil of the second relay, two ends of a contact of the first relay are respectively connected with two ends of the seventh resistor, two ends of a contact of the second relay are respectively connected with two ends of the eleventh resistor, and the other end of the coil of the first relay and the other end of the coil of the second relay are grounded.
7. The circuit of claim 5, wherein the amplifying subunit comprises a second operational amplifier, a sixteenth resistor, a seventeenth resistor and an eighteenth resistor, one end of the sixteenth resistor is a first end of the amplifying subunit, the other end of the sixteenth resistor and one end of the eighteenth resistor are connected to the positive input end of the second operational amplifier, one end of the seventeenth resistor is grounded via the first capacitor, the other end of the seventeenth resistor is connected to the negative input end of the second operational amplifier, and the other ends of the second operational amplifier and the eighteenth resistor are commonly connected to the second end of the amplifying subunit.
8. The circuit of claim 1, wherein the switching unit includes a third relay and a fourth relay, one end of a coil of the third relay is a first end of the switching unit, one end of a contact of the third relay is connected to a preset power supply, the other end of the contact of the third relay is a third end of the switching unit, the other end of the coil of the third relay and one end of the coil of the fourth relay are grounded via a second capacitor, the other end of the coil of the fourth relay is a second end of the switching unit, one end of the contact of the fourth relay is a fourth end of the switching unit, and the other end of the contact of the fourth relay is grounded via the first capacitor.
9. The circuit of claim 1, wherein the circuit further comprises:
The indicating unit is used for sending out a first signal when receiving the polarity error signal and sending out a second signal when receiving the voltage value abnormal signal;
The first end of the indicating unit is connected with the third end of the voltage polarity judging unit, the second end of the indicating unit is connected with the second end of the voltage value judging unit, the polarity error signal is output by the voltage polarity judging unit when the polarity of the battery cell voltage is wrong, and the voltage value abnormal signal is output by the voltage value judging unit when the battery cell voltage exceeds the preset voltage range.
10. The circuit of claim 9, wherein the indication unit comprises a first indication lamp, a second indication lamp, a fifth relay, a sixth relay, a nineteenth resistor and a twentieth resistor, one end of a coil of the fifth relay is a first end of the indication unit, two ends of a contact point of the fifth relay are respectively connected with two ends of the first indication lamp, one end of the first indication lamp is connected with one end of the nineteenth resistor, the other end of the nineteenth resistor is connected with a preset power supply, the other end of the first indication lamp and one end of the twentieth resistor are grounded, the other end of the twentieth resistor is connected with one end of the second indication lamp, the other end of the second indication lamp is connected with the preset power supply, one end of the coil of the sixth relay and the other end of the coil of the fifth relay are grounded, two ends of a contact point of the sixth relay are respectively connected with two ends of the second indication lamp, and when the first indication lamp is turned on, the second indication lamp emits the first signal when the first indication lamp is turned on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322343446.1U CN220913246U (en) | 2023-08-29 | 2023-08-29 | Battery management system test control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322343446.1U CN220913246U (en) | 2023-08-29 | 2023-08-29 | Battery management system test control circuit |
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| CN220913246U true CN220913246U (en) | 2024-05-07 |
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| CN202322343446.1U Active CN220913246U (en) | 2023-08-29 | 2023-08-29 | Battery management system test control circuit |
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