CN116990608A - Device, system and method for testing overcurrent protection function of battery management system - Google Patents
Device, system and method for testing overcurrent protection function of battery management system Download PDFInfo
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- CN116990608A CN116990608A CN202310911330.5A CN202310911330A CN116990608A CN 116990608 A CN116990608 A CN 116990608A CN 202310911330 A CN202310911330 A CN 202310911330A CN 116990608 A CN116990608 A CN 116990608A
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- 238000012360 testing method Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 50
- 238000007599 discharging Methods 0.000 claims abstract description 38
- 238000004146 energy storage Methods 0.000 claims abstract description 31
- 230000000087 stabilizing effect Effects 0.000 claims description 35
- 230000006854 communication Effects 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 34
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 238000002955 isolation Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005457 optimization Methods 0.000 description 5
- 229910001006 Constantan Inorganic materials 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000007175 bidirectional communication Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to the technical field of battery management system testing, and particularly provides a device, a system and a method for testing an overcurrent protection function of a battery management system, wherein the device comprises a control unit, and a detection unit and a discharge unit which are connected with the control unit; the discharge unit is connected with an energy storage unit for providing energy for the discharge unit; the detecting unit is used for being connected with a charging and discharging interface of an external product to be tested, and judging whether the product to be tested performs a protection function or not by detecting the voltage state of the charging and discharging interface and inputting the voltage state into the control unit; the discharging unit is used for adjusting the current of the product to be tested, which is output to the outside by the energy storage unit; the control unit is used for receiving the set current and the discharge duration and controlling the discharge unit to output corresponding current to an external product to be tested according to the received current and the discharge duration. By setting the current, permanent damage or damage of the key components of the product to be tested by the test behavior is avoided.
Description
Technical Field
The invention relates to the technical field of battery management system testing, in particular to a device, a system and a method for testing an overcurrent protection function of a battery management system.
Background
With the wide application of lithium batteries, a battery management system is used as a protection component of the lithium battery, the protection function of the battery management system is crucial, a battery charging and discharging loop of the battery management system usually adopts a MOSFET (metal oxide semiconductor field effect transistor) or/and a relay as a switching element, and the connection and disconnection of the lithium battery and a load or/and a charger are realized by controlling the connection and disconnection of the MOSFET or/and the relay.
In the product testing stage of the battery management system or the product testing stage of the lithium battery PACK group, particularly in the overcurrent protection function test, the lithium battery protected by the battery management system is generally used for providing test current, and in some simple test schemes, the magnitude of the test current is often uncontrollable, the lithium battery is easily damaged or permanently damaged, and the risk of fire and explosion can occur in serious cases; and the large current flows through the switching element, when the protection function is performed, the switching element is turned off when the large current passes, and irreversible permanent damage or damage may be caused to the switching element; or in the test phase, in order to avoid the aforementioned risks, the test of the overcurrent protection function is abandoned, reducing the reliability and quality of the product.
In view of the foregoing, it is desirable to provide a device, system and method for testing the overcurrent protection function of a battery management system that is safe and reliable.
Disclosure of Invention
The invention aims to improve the shipment quality of a battery management system or/and a lithium battery PACK product and the safety of a testing process, and provides a testing device, a system and a method for the overcurrent protection function of the battery management system, wherein the current of the testing device is controllable, and the overcurrent protection function is not caused to permanently damage or/and damage a lithium battery and a switching element.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a device for testing an overcurrent protection function of a battery management system, including a control unit, and a detection unit and a discharge unit connected with the control unit;
the discharge unit is connected with an energy storage unit for providing energy for the discharge unit;
the detection unit is used for being connected with a charging and discharging interface of an external product to be tested, and judging whether the product to be tested performs a protection function or not by detecting information of the charging and discharging interface and inputting the information into the control unit;
the device is particularly used for being connected with a charging and discharging interface of an external product to be tested to obtain the voltage of the charging and discharging interface, and inputting the detected voltage into a control unit to judge whether the product to be tested performs a protection function or not; or the device is connected with a charge-discharge interface of an external product to be tested and outputs a signal to the control unit through an internal circuit, and whether the product to be tested performs a protection function is judged;
the discharging unit is used for adjusting the current of the product to be tested, which is output to the outside by the energy storage unit;
the control unit is used for receiving the current magnitude and the discharge duration set outside and controlling the discharge unit to output corresponding current to the external product to be tested according to the received current magnitude and the discharge duration.
As a preferred embodiment of the present invention, the apparatus further comprises a voltage adjusting unit connected to the external ac power for converting the external ac power into a corresponding dc voltage, and the voltage adjusting unit is connected to the detecting unit, the control unit and the discharging unit, respectively, for providing the corresponding dc voltage.
As a preferable mode of the technical scheme of the invention, the device further comprises a charging unit, wherein the charging unit is connected with the energy storage unit and is used for charging the energy storage unit; the charging unit is used for being connected to external alternating current.
As a preferred aspect of the present invention, the apparatus further includes a detection interface, a discharge interface, and a communication interface for communicating with an external device;
the detection unit is connected to an external product to be tested through a detection interface;
the discharge unit is connected to an external product to be tested through a discharge interface;
the communication interface is connected with the control unit; the voltage regulating unit is connected with the communication interface and used for supplying power to the communication interface.
As an optimization of the technical scheme of the invention, the voltage regulating unit comprises a first rectifying regulating circuit, a first voltage stabilizing circuit and a second voltage stabilizing circuit which are sequentially connected;
the first rectification regulating circuit comprises a transformer and a rectifier bridge, wherein the input end of the transformer is connected with external alternating current, the secondary side of the transformer is connected with the rectifier bridge, and the output end of the rectifier bridge is connected with the first voltage stabilizing circuit;
the output end of the first voltage stabilizing circuit is also connected with the second voltage stabilizing circuit;
the first voltage stabilizing circuit comprises a first voltage stabilizing chip, and the second voltage stabilizing circuit comprises a second voltage stabilizing chip.
As an optimization of the technical scheme of the invention, the control unit comprises a trigger circuit, a state indicating circuit, a communication circuit and a reference signal generating circuit, wherein the trigger circuit is connected with the microcontroller and used for triggering a test, and the state indicating circuit is used for indicating a test state;
the communication circuit is connected with the communication interface;
the microcontroller is provided with a reference signal output for connection with the discharge unit.
As an optimization of the technical scheme of the invention, the detection unit comprises a first current-limiting protection circuit and an isolation protection circuit connected with the first current-limiting protection circuit;
the first current-limiting protection circuit comprises a triode Q1, wherein a collector electrode of the triode Q1 is connected to the positive end of the detection interface through a diode D1, the collector electrode of the triode Q1 is also connected with a base electrode of the triode Q1 through a resistor R1, and an emitter electrode of the triode Q1 is connected with the isolation protection circuit through a resistor R2; the base electrode of the triode Q1 is connected with the cathode of the voltage stabilizing diode ZD1, and the anode of the voltage stabilizing diode ZD1 is connected to the connection point of the first current limiting protection circuit and the isolation protection circuit;
the isolation protection circuit comprises a photoelectric coupler, an anode of a diode of the photoelectric coupler is connected with a resistor R2, a cathode of a diode of the light spot coupler is connected to a negative end of the detection interface, a collector of a triode of the photoelectric coupler is connected to a direct current power supply output by the voltage regulating unit, an emitter of the photoelectric coupler is grounded through a resistor R3 and a capacitor C1 which are connected in parallel, and a collector of the triode of the photoelectric coupler is connected to the control unit.
As an optimization of the technical scheme of the invention, the discharging unit comprises a following circuit and a load resistor connected in parallel, and the following circuit comprises a first operational amplifier and a second operational amplifier; the positive input end of the first operational amplifier is connected with the first end of the load resistor which is connected in parallel; the negative input end of the first operational amplifier is connected with the second end of the load resistor which is connected in parallel; the positive input end of the first operational amplifier is connected with a product to be tested, the output end of the first operational amplifier is connected with the input end of the second operational amplifier, and the input end of the second operational amplifier is also connected with the reference signal output end of the control unit; the second end of the parallel-connected load resistor is also connected with a parallel-connected transistor; as an optimization of the technical scheme of the invention, the charging unit comprises a second rectifying and voltage regulating circuit and a second current limiting and protecting circuit;
the second rectifying and voltage regulating circuit comprises a transformer and a rectifying bridge connected with the transformer;
a capacitor C2 is connected between the output ends of the rectifier bridge, and the positive output end of the rectifier bridge is connected with a current-limiting protection circuit through a diode D2;
the second current limiting protection circuit comprises a triode Q2, wherein a collector electrode of the triode Q2 is connected with a cathode of a diode D2, the collector electrode of the triode Q2 is further connected to a base electrode of the triode Q2 through a resistor R4, an emitter electrode of the triode Q2 is connected to a positive end of an energy storage unit through a resistor R5, a negative output end of a rectifier bridge of the charging unit is connected to a negative end of the energy storage unit, the base electrode of the triode Q2 is further connected with a cathode of a voltage stabilizing diode ZD2, and an anode of the voltage stabilizing diode ZD2 is connected to the positive end of the energy storage unit.
The energy storage unit comprises a capacitor, and the power supply regulating unit comprises a set of voltage converting circuit for supplying electric energy to the detection unit, the discharging unit and the control unit. The charging unit comprises a set of voltage conversion circuit for providing electric energy for the energy storage unit. The discharge unit is a set of adjustable constant current circuits and comprises a load resistor, a follower circuit and a transistor, wherein the transistor can be one or more of a triode and a MOSFET, IGBT, siC. The detection unit is a set of voltage detection circuit, and the voltage detection circuit is electrically connected with the control unit.
When the transistor is a MOS transistor, the second end of the parallel-connected load resistor is also connected with the parallel-connected MOS transistor; the grid electrode of each MOS tube is connected to the output end of the second operational amplifier, and the source electrode of each MOS tube is grounded.
In a second aspect, the present invention provides a system for testing an overcurrent protection function of a battery management system, where the battery management system is a product to be tested with the current protection function, and the system includes an upper computer and a testing device connected with the upper computer as described in the first aspect;
the testing device is connected with the product to be tested;
the upper computer is provided with a setting interface and a display interface;
the user sets the current and the discharge time through the setting interface, and inputs the set current and the set discharge time to the control unit;
the display interface of the upper computer is used for displaying the set current, the discharge duration and the test result output by the control unit through the communication interface.
The trigger circuit comprises a switch connected with the controller; the setting interface of the upper computer is also provided with a trigger button, and the information is input into the control unit to start the test by clicking the trigger button; or, the person information is transmitted to the control unit through the toggle switch to start the test.
The upper computer provides an interface and a trigger button for setting the current magnitude and the discharge duration for the tester, displays and records the test result, and carries out two-way communication with the test device through the communication interface, wherein the communication content comprises the current magnitude, the discharge duration, a trigger instruction and the test result.
A battery unit (here, the battery unit comprises a battery simulator and a battery pack) and a controller are arranged in the product to be tested, the positive end of the battery unit is connected to the positive end of a charge-discharge interface, and the negative end of the charge-discharge interface is connected to the negative end of the battery unit through a relay and a current sensor which are sequentially connected in series; the relay and the current sensor are respectively connected with the controller.
The overcurrent protection function test process is as follows:
and connecting the testing device with a product to be tested through a wire, wherein the product to be tested comprises an overcurrent protection function. Setting the current and the discharge time length of the testing device through the upper computer; the test function can be triggered by the trigger button of the upper computer or the trigger circuit of the test device.
The product to be tested is enabled to accurately collect the current flowing through the discharging unit of the testing device, and the current is only led into the current sensor of the product to be tested; the detection unit of the testing device can acquire the protection state of the product to be tested. Specifically, the detecting unit obtains the voltage of the charge-discharge interface, under the normal state, the relay is in a closed state, the detecting unit obtains a voltage UA, when the current applied to the current sensor through the discharging unit becomes large, the controller controls the relay to act (the relay is disconnected here), the detecting unit obtains the voltage UB of the charge-discharge interface, and whether the relay works normally or not is judged according to the magnitudes of the voltage UA and the voltage UB, namely whether the overcurrent protection function of the product to be detected is normal or not is judged.
In a third aspect, the present invention further provides a method for testing an overcurrent protection function of a battery management system based on the system in the first aspect, including the following steps:
step1: the current and the discharge time are set through the upper computer, and trigger information is received to start the test;
step2: the control unit acquires the voltage UA between the two wires of the detection interface through the detection unit;
step3: the control unit controls the discharge unit to output test current with specified size and duration according to the current size and the discharge duration set by the upper computer;
step4: when the test current is over, the control unit acquires the voltage UB between the two wires of the detection interface through the detection unit;
step5: and the control unit judges whether UA is larger than UB, if so, the control unit indicates that the overcurrent protection function of the product to be tested is normal, otherwise, the control unit indicates that the overcurrent protection function of the product to be tested is abnormal.
Step6: the control unit displays the test result through the upper computer or/and the state indicating circuit connected with the control unit.
From the above technical scheme, the invention has the following advantages: by setting the current magnitude, the discharge duration and the current lead-in mode, the permanent damage or the damage of the key components of the product to be tested by the test behavior is avoided, and the safety of the test process and the shipment quality of the product can be effectively ensured.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
It can be seen that the present invention has outstanding substantial features and significant advances over the prior art, as well as its practical advantages.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic block diagram of an apparatus of one embodiment of the invention.
Fig. 2 is a schematic diagram of a power supply adjusting unit according to an embodiment of the invention.
Fig. 3 is a block diagram of a control unit connection in an embodiment of the present invention.
FIG. 4 is a schematic diagram of connection of a detection unit according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of connection of a discharging unit in an embodiment of the invention.
Fig. 6 is a schematic diagram of connection of a charging unit according to an embodiment of the invention.
Fig. 7 is a schematic block diagram of a system of an embodiment of the present invention.
Fig. 8 is a schematic flow chart of a method in an embodiment of the invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a test device for an overcurrent protection function of a battery management system, which includes a control unit 8, and a detection unit 7 and a discharge unit 9 connected with the control unit 8;
the discharge unit 9 is connected with an energy storage unit 5 for providing energy for the discharge unit 9;
the detecting unit 7 is used for being connected with a charging and discharging interface of an external product to be tested, and judging whether the product to be tested performs a protection function or not by detecting information of the charging and discharging interface and inputting the information into the control unit 8;
the device is specifically used for being connected with a charging and discharging interface of an external product to be tested to obtain the voltage of the charging and discharging interface, and inputting the detected voltage into the control unit 8 to judge whether the product to be tested performs a protection function or not; or the device is connected with a charge-discharge interface of an external product to be tested and outputs a signal to the control unit 8 through an internal circuit to judge whether the product to be tested performs a protection function;
the discharging unit 9 is used for adjusting the current of the product to be tested, which is output to the outside by the energy storage unit 5;
the control unit 8 is configured to receive the current magnitude and the discharge duration set externally, and control the discharge unit 9 to output a corresponding current to an external product to be tested according to the received current magnitude and the discharge duration.
In some embodiments, the device further comprises a voltage regulating unit 3, said voltage regulating unit 3 being connected to an external alternating current 220Vac for converting the external alternating current into a corresponding direct voltage, said voltage regulating unit 3 being connected to the detecting unit 7, the control unit 8 and the discharging unit 9, respectively, for providing the corresponding direct voltage.
Specifically, the voltage regulating unit 3 includes a first rectifying regulating circuit 301, a first voltage stabilizing circuit 302, and a second voltage stabilizing circuit 303, which are sequentially connected;
as shown in fig. 2, the first rectifying and regulating circuit 301 of the voltage regulating unit 3 includes a transformer and a rectifying bridge, wherein an input end of the transformer is connected with external ac 220Vac, a secondary side of the transformer is connected with the rectifying bridge, an output end of the rectifying bridge is connected with the first voltage stabilizing circuit 302, and an output end of the first voltage stabilizing circuit 302 is also connected with the second voltage stabilizing circuit 303;
the first voltage stabilizing circuit 302 comprises a voltage stabilizing chip U4, the second voltage stabilizing circuit 303 comprises a voltage stabilizing chip U5, the positive output end of the rectifier bridge is connected with the input end of the voltage stabilizing chip U4, the output end of the voltage stabilizing chip U4 outputs a direct current power supply 12Vdc, the output end of the voltage stabilizing chip U4 is connected with the input end of the voltage stabilizing chip U5, the output end of the voltage stabilizing chip U5 outputs a direct current power supply 5Vdc, the positive output end of the rectifier bridge is connected to the negative output end of the rectifier bridge through a capacitor C3, the output end of the voltage stabilizing chip U4 is grounded through a capacitor C4, and the output end of the voltage stabilizing chip U5 is grounded through a capacitor C5.
In some embodiments, as shown in fig. 1, the apparatus further comprises a detection interface 10, a discharge interface 12, and a communication interface 6 for communicating with an external device;
the detection unit 7 is connected to an external product to be tested through a detection interface 10;
the discharge unit 9 is connected to an external product to be tested through a discharge interface 12;
the communication interface 6 is connected with a control unit 8; the voltage regulating unit 3 is connected to the communication interface 6 for powering the communication interface 6.
In some embodiments, as shown in fig. 3, the control unit 8 includes a microcontroller 801, a trigger circuit 802 for triggering a test, a status indication circuit 803 for indicating a test status, a communication circuit 804, and a reference signal generation circuit 805, which are connected to the microcontroller 801;
the communication circuit 804 is connected with the communication interface 6;
the microcontroller 801 is provided with a reference signal output for connection to the discharge unit 9. The supply voltage of the microcontroller is 5Vdc from the voltage regulator unit, the trigger circuit 802 may be a switch connected to the microcontroller, a signal input to the microcontroller during switching is a low level signal, and the test is started when the pin connected to the microcontroller and the switch receives the low level signal.
In some embodiments, as shown in fig. 4, the detection unit 7 includes a first current limiting protection circuit 701 and an isolation protection circuit 702 connected to the first current limiting protection circuit 701;
the first current limiting protection circuit 701 comprises a triode Q1, wherein a collector electrode of the triode Q1 is connected to the positive end of the detection interface 10 through a diode D1, the collector electrode of the triode Q1 is also connected with a base electrode of the triode Q1 through a resistor R1, and an emitter electrode of the triode Q1 is connected with the isolation protection circuit 702 through a resistor R2; the base electrode of the triode Q1 is connected with the cathode of a voltage stabilizing diode ZD1, and the anode of the voltage stabilizing diode ZD1 is connected to the connection point of the first current limiting protection circuit 701 and the isolation protection circuit 702;
the isolation protection circuit 702 comprises a photo coupler U4, an anode of a photo coupler diode is connected with a resistor R2, a cathode of a light spot coupler diode is connected to a negative end of the detection interface 10, a collector of a photo coupler triode is connected to a direct current power supply output by the voltage regulating unit 3, and is 12Vdc, an emitter of the photo coupler triode is grounded through the resistor R3 and a capacitor C1 which are connected in parallel, and a collector of the photo coupler triode is connected to the control unit 8.
In some embodiments, as shown in fig. 5, the discharging unit 9 includes a follower circuit 902 and a load resistor 901 connected in parallel, the follower circuit 902 including a first operational amplifier U1 and a second operational amplifier U2; the positive input end of the first operational amplifier U1 is connected with the first end of the load resistor 901 which is connected in parallel; the negative input end of the first operational amplifier U1 is connected with the second end of the load resistor 901 which is connected in parallel; the positive input end of the first operational amplifier U1 is connected with a product to be tested (here, a current sensor connected to the product to be tested); the output end of the first operational amplifier U1 is connected with the input end of the second operational amplifier U2, and the input end of the second operational amplifier U2 is also connected with the reference signal output end of the control unit 8; a parallel connected transistor 903 is also connected to the second terminal of the parallel connected load resistor 901. When the transistor is a MOS transistor, the second end of the parallel-connected load resistor is also connected with the parallel-connected MOS transistor; the grid electrode of each MOS tube is connected to the output end of the second operational amplifier, and the source electrode of each MOS tube is grounded.
It should be noted that, the parallel load resistor 901 includes a group of parallel constantan wires, such as resistors r9_1, r9_2, …, and r9_n in fig. 5, the parallel transistors 903 include parallel MOS transistors M1, M2, …, and Mn, a gate of each MOS transistor is connected to an output terminal of the second op-amp, and a source of each MOS transistor is grounded.
In some embodiments, as shown in fig. 6, the apparatus further includes a charging unit 4, where the charging unit 4 is connected to the energy storage unit 5, and is used to charge the energy storage unit 5; the charging unit 4 is for connection to an external alternating current 220Vac.
The charging unit 4 includes a second rectifying voltage-regulating circuit 401 and a second current-limiting protection circuit 402;
the second rectifying and voltage regulating circuit 401 comprises a transformer and a rectifying bridge connected with the transformer; a capacitor C2 is connected between the output ends of the rectifier bridges of the charging unit, and the positive output end of the rectifier bridge of the charging unit is connected with the second current-limiting protection circuit 402 through a diode D2;
the second current limiting protection circuit 402 includes a triode Q2, a collector of the triode Q2 is connected with a cathode of a diode D2, the collector of the triode Q2 is further connected to a base of the triode Q2 through a resistor R4, an emitter of the triode Q2 is connected to a positive end of the energy storage unit 5 through a resistor R5, a negative output end of a rectifier bridge of the charging unit 4 is connected to a negative end of the energy storage unit 5, the base of the triode Q2 is further connected with a cathode of a zener diode ZD2, and an anode of the zener diode ZD2 is connected to a positive end of the energy storage unit 5.
The energy storage unit 5 comprises a capacitor, and the power supply regulating unit comprises a set of voltage converting circuits for supplying electric energy to the detection unit 7, the discharge unit 9 and the control unit 8. The charging unit 4 comprises a set of voltage conversion circuits for supplying the energy storage unit 5 with electrical energy. The discharging unit 9 is a set of adjustable constant current circuits, and comprises a load resistor, a follower circuit and a transistor, wherein the transistor can be one or more of a triode and a MOSFET, IGBT, siC. The detection unit 7 is a set of voltage detection circuits, and the voltage detection circuits are electrically connected with the control unit 8.
As shown in fig. 7, an embodiment of the present invention provides a test system for an overcurrent protection function of a battery management system, which is a product 20 to be tested provided with the current protection function, and includes a host computer 2 and a test device 1 as described in the above embodiment;
the test device 1 is connected with a product 20 to be tested;
the upper computer 2 is provided with a setting interface and a display interface;
the user sets the current magnitude and the discharge time length through the setting interface, and inputs the set current magnitude and the set discharge time length to the control unit 8;
the display interface of the upper computer 2 is used for displaying the set current, the discharge duration and the test result output by the control unit 8 through the communication interface 6.
The trigger circuit comprises a switch connected with the controller; the setting interface of the upper computer 2 is also provided with a trigger button, and the information is input into the control unit 8 to start the test by clicking the trigger button; or, the test is started by inputting the person information to the control unit 8 through the toggle switch.
The detecting unit 7 is configured to connect with a charging/discharging interface 25 of an external product to be tested 20, and determine whether the product to be tested performs a protection function by detecting information of the charging/discharging interface 25 and inputting the information to the control unit 8;
the device is specifically used for being connected with a charge-discharge interface 25 of an external product to be tested 20 to obtain the voltage of the charge-discharge interface 25, and inputting the detected voltage into a control unit 8 to judge whether the product to be tested performs a protection function or not; or the device is connected with a charge-discharge interface of an external product to be tested and outputs a signal to the control unit 8 through an internal circuit to judge whether the product to be tested performs a protection function;
the upper computer 2 provides an interface and a trigger button for setting the current magnitude and the discharge duration for a tester, and displays and records the test result, the upper computer 2 carries out two-way communication with the test device 1 through the communication interface 6, and the communication content comprises the current magnitude, the discharge duration, a trigger instruction and the test result.
A battery unit 21 and a controller 24 are arranged in the product to be tested 20, the positive end of the battery unit 21 is connected to the positive end of a charge-discharge interface, and the negative end of the charge-discharge interface is connected to the negative end of the battery unit 21 through a relay 23 and a current sensor 22 which are sequentially connected in series; the relay 23 and the current sensor 22 are connected to the controller, respectively.
The test system provided by the embodiment of the invention comprises a test device 1 and an upper computer 2, wherein the upper computer 2 provides an interface for setting the current size and the discharge duration and a trigger button or a trigger interface, and displays and records a test result, and the upper computer 2 is in bidirectional communication with the test device 1 through an RS232 serial bus, and the communication content comprises the current size, the discharge duration, a trigger instruction and the test result. The testing device 1 comprises a communication interface 6, a power supply adjusting unit 3, an energy storage unit 5, a charging unit 4, a discharging unit 9, a detecting unit 7, a control unit 8, a discharging interface 12 and a detecting interface 10 which are electrically connected with each other, and the testing device 1 is connected with the upper computer 2 through the communication interface 6. The power supply adjusting unit 3 converts 220V ac mains supply input from the outside into 12V dc power supply and 5V dc power supply, and provides electric power for the detecting unit 7, the discharging unit 9 and the control unit 8. The energy storage unit 5 is a direct current electrolytic capacitor, and after the testing device 1 is connected with an external power supply, the charging unit 4 converts 220V alternating current mains supply input from the outside into a direct current power supply to charge the energy storage unit 5; the discharging unit 9 comprises a group of parallel constantan wires, a follower circuit and a group of parallel MOSFETs; the energy storage unit 5 is electrically connected with the discharge unit 9. The detection unit 7 includes a voltage detection circuit for detecting a voltage value of the detection port 10; the control unit 8 comprises a microcontroller, a trigger circuit, a state indicating circuit, a communication circuit and a reference signal generating circuit which are electrically connected with each other, the control unit 8 judges whether to start a test process or not through the state of the trigger circuit, the control unit 8 provides a reference voltage for the discharging unit 9, and the control unit 8 obtains the detection state of the detecting unit 7.
The product 20 to be tested is a battery PACK and comprises a current sensor 22, a relay 23, a battery unit 21, a controller 24 and a charge-discharge interface 25; and carrying out necessary setting according to the design requirement of the product to be tested 20 so that the product to be tested meets the condition of correctly executing the overcurrent protection function, when the product to be tested is in a non-overcurrent protection state, the relay 23 is closed, and otherwise, the relay 23 is opened. The current sensor 22 is a resistive current sensor; the discharging interface 12 is electrically connected with the resistive current sensor, and the detecting interface 10 is electrically connected with the charging and discharging interface 25;
the overcurrent protection function test process is as follows:
the testing device 1 is connected with a product to be tested through a wire, and the product to be tested comprises an overcurrent protection function. Setting the current magnitude and the discharge duration of the test device 1 through the upper computer 2; the test function can be triggered by the trigger button of the upper computer 2 or the trigger circuit of the test device 1.
Allowing the product to be tested to correctly collect the current flowing through the discharge unit 9 of the test device 1, the current being directed only to the current sensor 22 of the product to be tested 20; the detection unit 7 of the test device 1 can obtain the protection state of the product to be tested.
Specifically, the detecting unit 7 obtains the voltage of the charge-discharge interface, under the normal state, the relay 23 is in the closed state, the detecting unit 7 obtains a voltage UA, when the current applied to the current sensor 22 by the discharging unit 9 becomes larger, the controller 24 controls the relay 23 to act (the relay 23 is opened here), the detecting unit 7 obtains the voltage UB of the charge-discharge interface, and whether the relay 23 works normally or not is judged according to the magnitudes of the voltages UA and UB, that is, whether the overcurrent protection function of the product to be tested is normal or not is judged.
The system provides a reliable and simple test method by setting the current lead-in mode, avoids permanent damage or damage of key components of a product to be tested by test behaviors, simultaneously does not depend on a protected battery to provide large current, avoids damage or damage of the battery caused by the large current, improves the safety of the test process and the shipment quality of the product, and has good practicability and economy.
As shown in fig. 8, the embodiment of the present invention further provides a method for testing an overcurrent protection function of a battery management system based on the system described in the foregoing embodiment, including the following steps:
step1: the current and the discharge time are set through the upper computer, and trigger information is received to start the test;
step2: the control unit acquires the voltage UA between the two wires of the detection interface through the detection unit;
step3: the control unit controls the discharge unit to output test current with specified size and duration according to the current size and the discharge duration set by the upper computer;
step4: when the test current is over, the control unit acquires the voltage UB between the two wires of the detection interface through the detection unit;
step5: and the control unit judges whether UA is larger than UB, if so, the control unit indicates that the overcurrent protection function of the product to be tested is normal, otherwise, the control unit indicates that the overcurrent protection function of the product to be tested is abnormal.
Step6: the control unit displays the test result through the upper computer or/and the state indicating circuit connected with the control unit.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The device for testing the overcurrent protection function of the battery management system is characterized by comprising a control unit, a detection unit and a discharge unit, wherein the detection unit and the discharge unit are connected with the control unit;
the discharge unit is connected with an energy storage unit for providing energy for the discharge unit;
the detecting unit is used for being connected with a charging and discharging interface of an external product to be tested, and judging whether the product to be tested performs a protection function or not by detecting the voltage state of the charging and discharging interface and inputting the voltage state into the control unit;
the discharging unit is used for adjusting the current of the product to be tested, which is output to the outside by the energy storage unit;
the control unit is used for receiving the set current and the discharge duration and controlling the discharge unit to output corresponding current to an external product to be tested according to the received current and the discharge duration.
2. The apparatus according to claim 1, further comprising a voltage adjusting unit connected to the external ac power for converting the external ac power into a corresponding dc voltage, the voltage adjusting unit being connected to the detecting unit, the control unit and the discharging unit, respectively, for supplying the corresponding dc voltage.
3. The device for testing the overcurrent protection function of the battery management system according to claim 2, further comprising a charging unit connected to the energy storage unit for charging the energy storage unit; the charging unit is also connected to an external alternating current.
4. A test device for an overcurrent protection function of a battery management system according to claim 3, further comprising a detection interface, a discharge interface, and a communication interface for communicating with an external device;
the detection unit is connected to an external product to be tested through a detection interface;
the discharge unit is connected to an external product to be tested through a discharge interface;
the communication interface is connected with the control unit; the voltage regulating unit is connected with the communication interface and used for supplying power to the communication interface.
5. The device for testing the overcurrent protection function of the battery management system according to claim 4, wherein the control unit comprises a trigger circuit connected with the microcontroller and used for triggering the test, a state indicating circuit used for indicating the test state, a communication circuit and a reference signal generating circuit;
the communication circuit is connected with the communication interface;
the microcontroller is provided with a reference signal output for connection with the discharge unit.
6. The apparatus for testing an overcurrent protection function of a battery management system according to claim 5, wherein the detecting unit includes a first current limiting protection circuit and an isolation protection circuit connected to the first current limiting protection circuit;
the first current-limiting protection circuit comprises a triode Q1, wherein a collector electrode of the triode Q1 is connected to the positive end of the detection interface through a diode D1, the collector electrode of the triode Q1 is also connected with a base electrode of the triode Q1 through a resistor R1, and an emitter electrode of the triode Q1 is connected with the isolation protection circuit through a resistor R2; the base electrode of the triode Q1 is connected with the cathode of the voltage stabilizing diode ZD1, and the anode of the voltage stabilizing diode ZD1 is connected to the connection point of the first current limiting protection circuit and the isolation protection circuit;
the isolation protection circuit comprises a photoelectric coupler, the anode of the photoelectric coupler diode is connected with a resistor R2, the cathode of the light spot coupler diode is connected to the negative end of the detection interface, the collector of the photoelectric coupler triode is connected to a direct current power supply output by the voltage regulating unit, the emitter of the photoelectric coupler triode is grounded through a resistor R3 and a capacitor C1 which are connected in parallel, and the collector of the photoelectric coupler triode is connected to the control unit.
7. The apparatus for testing an overcurrent protection function of a battery management system according to claim 6, wherein the discharging unit includes a follower circuit and a load resistor connected in parallel, the follower circuit including a first operational amplifier and a second operational amplifier; the positive input end of the first operational amplifier is connected with the first end of the load resistor which is connected in parallel; the negative input end of the first operational amplifier is connected with the second end of the load resistor which is connected in parallel; the positive input end of the first operational amplifier is connected with a product to be tested, the output end of the first operational amplifier is connected with the input end of the second operational amplifier, and the input end of the second operational amplifier is also connected with the reference signal output end of the control unit; the second end of the parallel-connected load resistor is also connected with a parallel-connected transistor.
8. The device for testing the overcurrent protection function of the battery management system according to claim 7, wherein the charging unit comprises a second rectifying and voltage regulating circuit and a second current limiting protection circuit connected with the second rectifying and voltage regulating circuit;
the second rectifying and voltage regulating circuit is used for being connected to external alternating current and rectifying and voltage regulating the external alternating current to convert the external alternating current into output direct current voltage to the second current limiting protection circuit;
the second current limiting protection circuit comprises a triode Q2, wherein a collector electrode of the triode Q2 is connected with a cathode of a diode D2, the collector electrode of the triode Q2 is further connected to a base electrode of the triode Q2 through a resistor R4, an emitter electrode of the triode Q2 is connected to a positive end of an energy storage unit through a resistor R5, a negative output end of a rectifier bridge of the charging unit is connected to a negative end of the energy storage unit, the base electrode of the triode Q2 is further connected with a cathode of a voltage stabilizing diode ZD2, and an anode of the voltage stabilizing diode ZD2 is connected to the positive end of the energy storage unit.
9. A test system for the overcurrent protection function of a battery management system, wherein the battery management system is a product to be tested provided with the overcurrent protection function, and is characterized in that the test system comprises an upper computer and the test device according to any one of claims 1-8 connected with the upper computer;
the testing device is connected with the product to be tested;
the upper computer is provided with a setting interface and a display interface;
the user sets the current and the discharge time through the setting interface, and inputs the set current and the set discharge time to the control unit;
the display interface of the upper computer is used for displaying the set current, the discharge duration and the test result output by the control unit through the communication interface.
10. A method for testing the overcurrent protection function of a battery management system based on the system of claim 9, comprising the steps of:
the current and the discharge time are set through the upper computer, and trigger information is received to start the test;
the control unit acquires the voltage UA between two wires of the detection interface through the detection unit;
the control unit controls the discharge unit to output test current with specified size and duration according to the current size and the discharge duration set by the upper computer;
when the test current is over, the control unit acquires the voltage UB between the two wires of the detection interface through the detection unit;
the control unit judges whether UA is larger than UB, if so, the overcurrent protection function of the product to be tested is normal, otherwise, the overcurrent protection function of the product to be tested is abnormal;
the control unit displays the test result through the upper computer or/and the state indicating circuit connected with the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310911330.5A CN116990608A (en) | 2023-07-24 | 2023-07-24 | Device, system and method for testing overcurrent protection function of battery management system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310911330.5A CN116990608A (en) | 2023-07-24 | 2023-07-24 | Device, system and method for testing overcurrent protection function of battery management system |
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| Publication Number | Publication Date |
|---|---|
| CN116990608A true CN116990608A (en) | 2023-11-03 |
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| CN202310911330.5A Pending CN116990608A (en) | 2023-07-24 | 2023-07-24 | Device, system and method for testing overcurrent protection function of battery management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117595928A (en) * | 2024-01-17 | 2024-02-23 | 苏州元脑智能科技有限公司 | Annotate wrong test fixture |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117595928A (en) * | 2024-01-17 | 2024-02-23 | 苏州元脑智能科技有限公司 | Annotate wrong test fixture |
| CN117595928B (en) * | 2024-01-17 | 2024-04-05 | 苏州元脑智能科技有限公司 | Annotate wrong test fixture |
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