Charging test system and charging test method

Abstract

The invention provides a charging test system and a charging test method. The charging test system comprises an upper computer, a communication interface circuit and a battery simulation unit. The upper computer is used for controlling the communication interface circuit to output an access signal; the upper computer is also used for controlling the communication interface circuit to perform handshake communication with the charging management equipment according to the access signal; and the upper computer is also used for controlling the communication interface circuit to perform charging communication with the charging management equipment. The battery simulation unit is used for being electrically connected with charging management equipment; and the battery simulation unit is used for outputting the simulated battery voltage and / or the simulated battery temperature to the charging management equipment based on the control of the upper computer, so that the charging management equipment executes charging control operation according to the simulated battery voltage and / or the simulated battery temperature. Through communication between the simulation charging pile and the battery energy distribution unit and the charging management equipment, different charging states of the battery are simulated, and then charging test of the battery management equipment is realized.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging test system and a charging test method. Background Art

[0002] At present, the charging process development and testing functions of the Battery Management System (BMS) need to be connected to the charging pile tester. During the development and testing process, external battery energy distribution unit (BDU), battery module management unit (BMU), battery pack and other related equipment are required, resulting in a large development environment space and many interference factors, making it difficult to obtain accurate test results. Summary of the invention

[0003] In order to solve the problems in the prior art, the present application provides a charging test system and a charging test method, which can reduce the testing, development costs and occupied space of charging management equipment.

[0004] The present application provides a charging test system for testing a charging management device, the charging test system comprising:

[0005] Host computer;

[0006] The communication interface circuit, the host computer is used to control the communication interface circuit to output an access signal; the host computer is also used to control the communication interface circuit to perform handshake communication with the charging management device according to the access signal; the host computer is also used to control the communication interface circuit to perform charging communication with the charging management device;

[0007] A battery simulation unit, the battery simulation unit is used to be electrically connected to the charging management device; the battery simulation unit is used to simulate the battery voltage and / or simulate the battery temperature to the charging management device based on the control output of the host computer, so that the charging management device performs charging control operations according to the simulated battery voltage and / or the simulated battery temperature.

[0008] In one embodiment, the host computer is also used to output a simulated battery current and / or a simulated battery insulation impedance, and the simulated battery current and / or the simulated battery insulation impedance are transmitted to the charging management device via the communication interface circuit, so that the charging management device performs a charging control operation according to the simulated battery current and / or the simulated battery insulation impedance.

[0009] In one embodiment, if at least one of the simulated battery voltage, the simulated battery temperature, the simulated battery current and the simulated battery insulation impedance reaches a condition for stopping charging, and the communication interface circuit receives a stop charging signal from the charging management device, the host computer determines that the charging management device is qualified; if at least one of the simulated battery voltage, the simulated battery temperature, the simulated battery current and the simulated battery insulation impedance reaches a condition for stopping charging, and the communication interface circuit does not receive a stop charging signal from the charging management device, the host computer determines that the charging management device is unqualified; wherein the stop charging condition includes that the simulated battery voltage reaches a saturation voltage or is outside a preset voltage threshold, the simulated battery current is outside a preset current threshold, the simulated battery insulation impedance is outside a preset impedance threshold, and the simulated battery temperature is outside a preset temperature threshold.

[0010] In one embodiment, the host computer is further used to control the communication interface circuit to output a stop charging instruction to the charging management device;

[0011] After the host computer outputs a stop charging instruction, if the communication interface circuit receives a stop charging signal from the charging management device, the host computer determines that the charging management device is qualified; if the communication interface circuit does not receive a stop charging signal from the charging management device, the host computer determines that the charging management device is unqualified.

[0012] In one embodiment, the communication interface circuit comprises:

[0013] a first communication circuit, wherein the first communication circuit is used to transmit a first communication signal;

[0014] A second communication circuit, wherein the second communication circuit is used to transmit a second communication signal; a transmission rate of the first communication signal is lower than a transmission rate of the second communication signal.

[0015] An interface circuit, the interface circuit comprising a power pin and a data transmission pin; the host computer is used to control the power pin to output the access signal when the charging management device is connected; the data transmission pin is used to transmit the first communication signal or the second communication signal to the charging management device.

[0016] In one embodiment, the battery simulation unit comprises:

[0017] A voltage conversion circuit, the voltage conversion circuit is used to output a supply voltage of corresponding magnitude based on the control of the host computer;

[0018] A battery voltage simulation circuit, the battery voltage simulation circuit is used to output the simulated battery voltage according to the power supply voltage;

[0019] A temperature simulation circuit, the temperature simulation circuit is used to simulate the battery temperature of the corresponding temperature based on the control output of the host computer;

[0020] A battery management unit is used to receive the simulated battery voltage and the simulated battery temperature, and output the simulated battery voltage and the simulated battery temperature to the charging management device.

[0021] In one embodiment, the battery voltage simulation circuit includes a plurality of first resistors; the plurality of first resistors are used to generate a plurality of the simulated battery voltages according to the supply voltage.

[0022] In one embodiment, the host computer is also used to output a simulated total battery voltage, a simulated DC output voltage, and a simulated load voltage to the charging management device, so that the charging management device performs a charging control operation according to the simulated total battery voltage, the simulated DC output voltage, and the simulated load voltage.

[0023] The present application also proposes a charging test method, which is applied to a charging test system. The charging test system is used to test a charging management device. The charging test method includes:

[0024] When detecting that the charging management device is connected, outputting a connection signal;

[0025] Perform handshake communication with the charging management device based on the access signal;

[0026] After the handshake is successful, charging communication is performed with the charging management device;

[0027] The simulated battery voltage and / or the simulated battery temperature are output to the charge management device so that the charge management device performs a charge control operation according to the simulated battery voltage and / or the simulated battery temperature.

[0028] In one embodiment, the charging test method further includes:

[0029] The simulated battery current and / or the simulated battery insulation resistance are output to the charging management device, so that the charging management device performs a charging control operation according to the simulated battery current and / or the simulated battery insulation resistance.

[0030] The present application simulates the charging pile through the host computer to communicate with the charging management device, so as to simulate the charging process of the charging management device; the host computer simulates the battery energy distribution unit to control the battery simulation unit to output the simulated battery voltage and / or simulated battery temperature, so as to simulate different battery charging states, and then realize the charging test of the battery management device. The charging test system of the present application can accurately simulate the battery parameters during the charging process and improve the accuracy of the test results. The charging test system of the present application does not require external battery packs, battery energy distribution units and other equipment, which reduces the testing and development costs and occupied space of the charging management device. And the charging test system of the present application does not need to be connected to high voltage, so it is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an embodiment of a charging test system of the present application.

[0032] Figure 2 This is a schematic diagram of the structure of an embodiment of a communication interface circuit of the present application.

[0033] Figure 3 It is a structural diagram of an embodiment of an interface circuit of the present application.

[0034] Figure 4 It is a structural diagram of another embodiment of the interface circuit of the present application.

[0035] Figure 5 It is a structural diagram of another embodiment of the interface circuit of the present application.

[0036] Figure 6 It is a structural schematic diagram of an embodiment of a battery simulation unit of the present application.

[0037] Figure 7 It is a structural diagram of an embodiment of a battery voltage simulation circuit of the present application.

[0038] Figure 8 FIG. 1 is a schematic diagram of the structure of a temperature simulation circuit according to an embodiment of the present application.

[0039] Fig. 9 It is a structural schematic diagram of an embodiment of a charging test method of the present application.

[0040] Fig.10 It is a structural schematic diagram of another embodiment of the charging test method of the present application.

[0041] Main component symbols

[0042] Charging test system 100 Host computer 110

[0043] Communication interface circuit 120 Battery simulation unit 130

[0044] First communication circuit 121 Second communication circuit 122

[0045] Interface circuit 123 Voltage conversion circuit 131

[0046] Battery voltage simulation circuit 132 Temperature simulation circuit 133

[0047] Battery management unit 134 Third resistor R3

[0048] The first resistor R1 The second resistor R2

[0049] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0051] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0053] The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0054] At present, most electronic devices are designed with batteries to increase battery life. In order to ensure the safety of the battery during the charging process, the charging management equipment in the electronic equipment is usually tested before leaving the factory, such as over / under voltage fault test, over temperature fault test, insulation fault test, charging pile suspension test, etc. The realization of these test functions requires external battery energy distribution unit (BDU), battery module management unit (BMU), battery pack and other related equipment, resulting in a large test environment space. In addition, the over / under voltage state, over temperature state or insulation fault state of the battery pack is also difficult to control, which makes the test environment unstable and the test results will also be affected.

[0055] In order to solve the above problems, the present application proposes a charging test system 100, which can simulate the communication interaction between the charging pile and the battery energy distribution unit and the charging management device during the charging process, and perform a charging test on the charging management device. Figure 1 The charging test system 100 includes a host computer 110 , a communication interface circuit 120 and a battery simulation unit 130 .

[0056] The host computer 110 is used to control the communication interface circuit 120 to output an access signal; the host computer 110 is also used to control the communication interface circuit 120 to perform handshake communication with the charging management device according to the access signal; the host computer 110 is also used to control the communication interface circuit 120 to perform charging communication with the charging management device;

[0057] The battery simulation unit 130 is also used to be electrically connected to the charging management device; the battery simulation unit 130 is used to output a simulated battery voltage and / or a simulated battery temperature to the charging management device based on the control of the host computer 110, so that the charging management device performs a charging control operation according to the simulated battery voltage and / or the simulated battery temperature.

[0058] In this embodiment, the communication control interface can simulate physical contact with the charging management device (for example, the charging plug is connected to the charging pile). After the physical contact is completed, the host computer 110 can simulate the charging pile and the battery energy distribution unit, and perform handshake communication and charging communication with the charging management device. The battery simulation unit 130 can simulate the battery pack, output simulated battery voltage and / or simulated battery temperature, and then simulate the battery over / under voltage state and over-temperature state to charge the charging management device. Among them, the charging management device can be applied to electronic devices such as electric vehicles and outdoor energy storage devices to manage the charging process of the battery pack in the electronic device. For example, when the charging voltage, charging current, charging temperature, etc. of the battery pack are abnormal, it is necessary to disconnect the charging in time.

[0059] In one embodiment, the host computer 110 can simulate the communication between the charging pile and the charging management device. In the first stage, when the charging management device is connected, the host computer 110 controls the power pin of the communication interface circuit 120 to close, simulating the physical contact when the charging plug is inserted into the charging pile. The host computer 110 and the charging management device can determine the connection status by detecting the voltage of the power pin of the communication interface circuit 120. At this time, the charging pile simulated by the host computer 110 can output an auxiliary voltage through the communication interface circuit 120 to simulate auxiliary power-on, and perform handshake communication with the charging management device. If the handshake communication times out, the fault handling process is entered, and the host computer 110 ends charging and records the cause of the fault.

[0060] In the second stage, after the handshake communication is successful, the host computer 110 simulates the charging pile to communicate with the charging management device, and outputs the corresponding charging voltage through the communication interface circuit 120 according to the charging requirements of the charging management device. If the charging communication times out, the fault handling process is entered, and the host computer 110 ends the charging and records the cause of the fault.

[0061] In the third stage, the host computer 110 simulates that the charging pile stops charging when receiving the full power signal from the charging management device, and records the charging information (such as the initial state of charge of the charging management device, the final state of charge, the minimum voltage of the battery and the maximum voltage of the charging pile, the output power, the accumulated charging time, etc.). In this way, the host computer 110 simulates the communication interaction between the charging pile and the charging device during the charging process.

[0062] During the charging process, the host computer 110 can also output a charging stop command to the charging management device at any time to test whether the charging management device can be powered off normally in the event of an external fault (for example, when the emergency stop button of the charging pile is pressed). If the charging management device outputs a stop charging signal after receiving the charging stop command, it means that the charging management device can be powered off normally, and the host computer 110 determines that the function of the charging management device is qualified; if the charging management device does not output a stop charging signal after receiving the charging stop command, it means that the charging management device cannot be powered off normally, and the host computer 110 determines that the charging management device is unqualified and records the fault and the cause.

[0063] In another embodiment, the host computer 110 can simulate the battery energy distribution unit to communicate with the charging management device. In practical applications, the battery energy distribution unit is usually used to monitor parameters such as current, voltage, temperature and insulation resistance of the battery pack, and send these parameters to the charging management device. In order to simplify the charging test process of the battery management device and reduce the space occupied by the test environment, in this embodiment, in the second stage of the charging process, the battery energy distribution unit simulated by the host computer 110 can control the battery simulation unit 130 to output the simulated battery voltage and / or simulated battery temperature as monitoring parameters to send to the battery management device to simulate the normal charging state, over / under voltage state, low temperature state, over-temperature state, etc. of the battery. If the simulated battery charging state reaches the stop charging condition (e.g., internal battery failure or full charge), and the communication interface circuit 120 receives the stop charging signal of the charging management device, indicating that the battery management device can normally power off when the battery fails or is fully charged, then the host computer 110 determines that the function of the charging management device is qualified; if the battery simulation parameters reach the stop charging condition, and the communication interface circuit 120 does not receive the stop charging signal of the charging management device, indicating that the battery management device cannot normally power off when the battery fails or is fully charged, then the host computer 110 determines that the charging management device is unqualified. Among them, the stop charging condition includes that the simulated battery voltage reaches the saturation voltage or is outside the preset voltage threshold and the simulated battery temperature is outside the preset temperature threshold.

[0064] For example, the charging voltage in the configuration parameters of the charging management device is 3.3V to 4.3V, and the charging temperature is 30° C. to 40° C. The battery energy distribution unit simulated by the host computer 110 can control the battery simulation unit 130 to generate a voltage of 3.3V (simulating the normal charging state of the battery) and output it to the charging management device. At this time, the charging management device should be in a normal charging state.

[0065] The battery energy distribution unit simulated by the host computer 110 can also control the battery simulation unit 130 to generate a voltage of 2.5V (simulating a battery undervoltage state) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, the host computer 110 determines that this function of the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified.

[0066] The battery energy distribution unit simulated by the host computer 110 can also control the battery simulation unit 130 to generate a voltage of 10V (simulating a battery overvoltage state) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, the host computer 110 determines that this function of the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified.

[0067] The battery energy distribution unit simulated by the host computer 110 can also control the battery simulation unit 130 to generate a voltage of 4.5V (simulating the battery being fully charged and reaching the saturation voltage) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, the host computer 110 determines that this function of the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified.

[0068] The battery energy distribution unit simulated by the host computer 110 can also control the battery simulation unit 130 to generate an electrical signal corresponding to 15°C (simulating the low temperature state of the battery) and output it to the charging management device. At this time, if the charging management device outputs a heating signal, the host computer 110 determines that this function of the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified.

[0069] The battery energy distribution unit simulated by the host computer 110 can also control the battery simulation unit 130 to generate an electrical signal corresponding to 55°C (simulating the battery over-temperature state) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, the host computer 110 determines that this function of the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified.

[0070] In addition, the battery energy distribution unit simulated by the host computer 110 can also output the simulated battery current and / or simulated battery insulation impedance to the charging management device through the communication interface circuit 120 to simulate the battery current fault state or the battery insulation fault state. If the simulated battery current is outside the preset current threshold and / or the simulated battery insulation impedance is outside the preset impedance threshold, and the communication interface circuit 120 receives the stop charging signal of the charging management device, indicating that the battery management device can be powered off normally when the battery has an internal fault, then the host computer 110 determines that the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified. Among them, the host computer 110 outputs the simulated battery current and / or simulated battery insulation impedance in a way that sends a string of messages, and embeds the corresponding size of the simulated battery current and / or simulated battery insulation impedance information into the message. For example, the battery energy distribution unit simulated by the host computer 110 sends 001300H, and the "13" in the message represents the size of the simulated battery current. Among them, the simulated battery insulation impedance includes positive insulation impedance and negative insulation impedance.

[0071] The present application simulates the charging pile and communicates with the charging management device through the host computer 110 to realize the simulation of the charging process of the charging management device; the host computer 110 simulates the battery energy distribution unit to control the battery simulation unit 130 to output the simulated battery voltage and / or simulated battery temperature, so as to realize the simulation of different battery charging states, and then realize the charging test of the battery management device. The charging test system 100 of the present application can accurately simulate the battery parameters during the charging process and improve the accuracy of the test results. The charging test system 100 of the present application does not require external battery packs, battery energy distribution units and other equipment, reducing the testing, development costs and occupied space of the charging management device. And the charging test system 100 of the present application does not need to be connected to high voltage, and is safer.

[0072] In one embodiment, referring to Figure 2 The communication interface circuit 120 includes a first communication circuit 121 , a second communication circuit 122 and an interface circuit 123 .

[0073] The first communication circuit 121 is used to transmit a first communication signal.

[0074] The second communication circuit 122 is used to transmit a second communication signal; the transmission rate of the first communication signal is lower than the transmission rate of the second communication signal.

[0075] The interface circuit 123 includes a power pin and a data transmission pin; the host computer 110 is used to control the power pin to output an access signal when the charging management device is connected; the data transmission pin is used to transmit the first communication signal or the second communication signal to the charging management device.

[0076] In this embodiment, the charging pile simulated by the host computer 110 can communicate with the charging management device through the first communication circuit 121 with a higher transmission rate, and the battery energy distribution unit simulated by the host computer 110 can communicate with the charging management device through the second communication circuit 122 with a lower transmission rate. In this way, signal interference during transmission of different data can be avoided. Among them, the first communication circuit 121 can be implemented by an electric vehicle communication controller (Electric Vehicle Communication Controller, EVCC), and the second communication circuit 122 can be implemented by a CAN (Controller Area Network) communication circuit.

[0077] In the first stage of the charging process, when the charging management device is connected to the interface circuit 123 (simulating the insertion of a plug), the host computer 110 controls the first switch on the power pin to close, and the voltage on the power pin changes. The host computer 110 and the charging management device determine the connection status of the interface circuit 123 by detecting the voltage change of the power pin.

[0078] For example, refer to Figures 3-4 , which is a circuit diagram for simulating the insertion of a plug gun into a charging pile. Among them, VCC1 is 12V, and the resistor R11=R12=1kΩ. When the charging management device is connected, the host computer 110 controls the GB_DC_Proximity_CTRL pin to a low potential (simulating the insertion of a plug gun) so that the contact 1 and the contact 3 of the first switch are connected. At this time, the voltage on the power pin CC2 is 6V. The host computer 110 and the charging management device determine that the charging management device has been connected by detecting that the voltage on the power pin CC2 is 6V.

[0079] After confirming that the charging management device is connected, the charging pile simulated by the host computer 110 can also control the auxiliary power pin of the interface circuit 123 to be closed to output auxiliary power, simulating the auxiliary power-on of the charging pile.

[0080] For example, refer to Figure 5 , which is a circuit diagram for simulating auxiliary power-on. Among them, VCC2 is 12V. The host computer 110 controls GB_DC_A_CTRL to be set to a low potential, so that the contact 5 of the second switch is connected to the contact 6, the auxiliary power pin A- is grounded, and the contact 3 is connected to the contact 4, and the auxiliary power pin A+ is 12V, so as to realize the simulation of auxiliary power-on.

[0081] Afterwards, the charging pile simulated by the host computer 110 controls the first communication circuit 121 or the second communication circuit 122 to perform handshake communication and charging communication with the charging management device through the data transmission pin.

[0082] In one embodiment, referring to Figure 6 The battery simulation unit 130 includes a voltage conversion circuit 131, a battery voltage simulation circuit 132, a temperature simulation circuit 133 and a battery management unit 134.

[0083] The voltage conversion circuit 131 is used to output a power supply voltage of corresponding magnitude based on the control of the host computer 110;

[0084] The battery voltage simulation circuit 132 is used to output the simulated battery voltage according to the supply voltage;

[0085] The temperature simulation circuit 133 is used to simulate the battery temperature of the corresponding temperature based on the control output of the host computer 110;

[0086] The battery management unit 134 is configured to receive the simulated battery voltage and the simulated battery temperature, and output the simulated battery voltage and the simulated battery temperature to the charging management device.

[0087] In this embodiment, the voltage conversion circuit 131 can be implemented by a power supply. The battery voltage simulation circuit 132 can be implemented by a resistor. The input end of the voltage conversion circuit 131 is connected to the power supply voltage. After the host computer 110 sets the analog voltage value, the host computer 110 can control the voltage conversion circuit 131 to convert the power supply voltage into a power supply voltage of corresponding magnitude, so that the power supply voltage generates a simulated battery voltage of corresponding magnitude at both ends of the resistor.

[0088] The battery voltage simulation circuit 132 may include a plurality of first resistors R1, and the plurality of first resistors R1 may be connected in series or in parallel. Figure 7 , the battery voltage simulation circuit 132 includes 7 first resistors R1 connected in series in sequence and with equal resistance values. When simulating the battery overvoltage state, the simulated voltage value can be set to 35V in the host computer 110. The host computer 110 controls the voltage conversion circuit 131 to convert the power supply voltage into a 35V supply voltage. After the 35V supply voltage is divided by the 7 first resistors R1, a simulated battery voltage of 5V is formed at both ends of each resistor. The battery management unit 134 obtains 7 simulated battery voltages by collecting the voltage across each resistor, and outputs the 7 simulated battery voltages to the charging management device. In this way, the simulation of different voltage states of the battery is realized by dividing the voltage of multiple series resistors, replacing the battery pack that needs to be actually connected, thereby reducing the occupied space of the test environment.

[0089] In practical applications, the battery management unit 134 usually uses a temperature sensor to detect the temperature of the battery. At different temperatures, the resistance of the temperature sensor is different. The battery management unit 134 can determine the temperature value of the battery by detecting the resistance of the temperature sensor. In this embodiment, the temperature simulation circuit 133 can be implemented by using a resistor, a programmable resistor card, etc., and the simulation of different temperatures can be achieved by adjusting the resistance value of the temperature simulation circuit 133. For example, referring to Figure 8 , the temperature simulation circuit 133 includes a second resistor R2, a third resistor R3 and a third switch. Among them, the first resistor R1 is 7276Ω, and the second resistor R2 is 2724Ω. When the host computer 110 controls the third switch to be disconnected, the resistance value of the temperature simulation circuit 133 is 10000Ω, and the corresponding temperature value is 25°C. When the host computer 110 controls the third switch to be closed, the resistance value of the temperature simulation circuit 133 is 2724Ω, and the corresponding temperature value is 55°C. In this way, the temperature value to be simulated is set in the host computer 110, and the host computer 110 can adjust the resistance value of the temperature simulation circuit 133 to the corresponding size. The battery management unit 134 determines the size of the simulated battery temperature by collecting the resistance value of the temperature simulation circuit 133, and transmits the simulated battery temperature to the charging management device. The battery temperature is simulated by adjusting the resistance value of the temperature simulation circuit 133, replacing the battery pack and temperature sensor that need to be actually connected, reducing the occupied space of the test environment.

[0090] In one embodiment, the battery simulation unit 130 further includes a first circuit board and a second circuit board. The voltage conversion circuit 131, the battery voltage simulation circuit 132, and the temperature simulation circuit 133 are arranged on the second circuit board. The battery management unit 134 is arranged on the second circuit board. In practical applications, the battery management unit 134 needs to be installed in the battery pack after the test is completed. Therefore, in this embodiment, the voltage conversion circuit 131, the battery voltage simulation circuit 132, the temperature simulation circuit 133, and the battery management unit 134 are respectively arranged on two circuit boards, which does not affect the continued use of the battery management unit 134 after the test is completed.

[0091] In one embodiment, the host computer 110 is further configured to output a simulated total battery voltage, a simulated DC output voltage, and a simulated load voltage to the charging management device.

[0092] The host computer 110 can also simulate the battery energy distribution unit to output a simulated total battery voltage to the charging management device through the communication interface circuit 120 to simulate the total battery voltage fault state. If the simulated total battery voltage is outside the preset total voltage threshold, and the communication interface circuit 120 receives the stop charging signal of the charging management device, it means that the battery management device can be powered off normally when the battery has an internal fault, then the host computer 110 determines that the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified. Among them, the host computer 110 can output the simulated total battery voltage by sending a string of messages, and embedding the simulated total battery voltage information of the corresponding size into the message. For example, the battery energy distribution unit simulated by the host computer 110 sends 001500H, and the "15" in the message represents the size of the simulated total battery voltage.

[0093] In practical applications, the charging management device in the electronic device is also used to manage the discharge of the battery pack. For example, when the battery pack is connected to the load to supply power to the load, if the DC output voltage or the load voltage is abnormal, the charging management device needs to promptly control the battery pack to stop discharging. In this embodiment, the host computer 110 can also simulate the battery energy distribution unit to output the simulated DC output voltage and the simulated load voltage to the charging management device through the communication interface circuit 120 to simulate the battery discharge fault state. If the simulated DC output voltage is outside the preset DC output voltage threshold and / or the simulated load voltage is outside the preset load voltage threshold, and the communication interface circuit 120 receives the stop discharge signal of the charging management device, indicating that the battery management device can be powered off normally when the battery is discharged, then the host computer 110 determines that the charging management device is qualified, otherwise the host computer 110 determines that the charging management device is unqualified. Among them, the way in which the host computer 110 outputs the simulated DC output voltage and the simulated load voltage can be the same as the way in which the simulated battery total voltage is output.

[0094] Reference Fig. 9 The present application also proposes a charging test method, which is applied to a charging test system 100. The charging test system 100 is used to test a charging management device. The charging test method includes:

[0095] S1: When it is detected that the charging management device is connected, an access signal is output.

[0096] When the charging management device is connected, it outputs an access signal to control the power pin connected to the charging management device to close, simulating the physical contact when the charging plug is inserted into the charging pile. The charging management device can determine the connection status by detecting the voltage of the power pin of the communication interface circuit 120.

[0097] S2: Perform handshake communication with the charging management device based on the access signal.

[0098] The simulated charging pile performs handshake communication with the charging management device. If the handshake communication times out, the fault handling process is entered to end charging and record the cause of the fault.

[0099] S3: After the handshake is successful, charging communication is performed with the charging management device.

[0100] The simulated charging pile communicates with the charging management device, and outputs the corresponding charging voltage through the communication interface circuit 120 according to the charging demand of the charging management device. If the charging communication times out, the fault handling process is entered, the charging is terminated and the cause of the fault is recorded.

[0101] S4: Outputting a simulated battery voltage and / or a simulated battery temperature to the charging management device, so that the charging management device performs a charging control operation according to the simulated battery voltage and / or the simulated battery temperature.

[0102] The simulated battery energy distribution unit communicates with the charging management device. In practical applications, the battery energy distribution unit is usually used to monitor parameters such as current, voltage, temperature and insulation resistance of the battery pack, and send these parameters to the charging management device. In order to simplify the charging test process of the battery management device and reduce the space occupied by the test environment, in this embodiment, the charging test system 100 can simulate the battery energy distribution unit to output the simulated battery voltage and / or simulated battery temperature as monitoring parameters and send them to the battery management device to simulate the normal charging state, over / under voltage state, low temperature state, over-temperature state, etc. of the battery. If the simulated battery charging state reaches the stop charging condition (for example, the battery internal fault or full charge), and the stop charging signal of the charging management device is received, it means that the battery management device can be normally powered off when the battery fails or is fully charged, then the host computer 110 determines that the charging management device is qualified; if the battery simulation parameter reaches the stop charging condition, and the stop charging signal of the charging management device is not received, it means that the battery management device cannot be normally powered off when the battery fails or is fully charged, then the charging management device is determined to be unqualified. The charging stop condition includes that the simulated battery voltage reaches a saturation voltage or is outside a preset voltage threshold and the simulated battery temperature is outside a preset temperature threshold.

[0103] For example, the charging voltage in the configuration parameters of the charging management device is 3.3V to 4.3V, and the charging temperature is 30° C. to 40° C. The battery energy distribution unit simulated by the charging test system 100 can generate a voltage of 3.3V (simulating the normal charging state of the battery) and output it to the charging management device, at which time the charging management device should be in a normal charging state.

[0104] The battery energy distribution unit simulated by the charging test system 100 can also generate a 2.5V voltage (simulating a battery undervoltage state) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, it is determined that this function of the charging management device is qualified, otherwise it is determined that the charging management device is unqualified.

[0105] The battery energy distribution unit simulated by the charging test system 100 can also generate a voltage of 10V (simulating a battery overvoltage state) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, it is determined that this function of the charging management device is qualified, otherwise it is determined that the charging management device is unqualified.

[0106] The battery energy distribution unit simulated by the charging test system 100 can also generate a voltage of 4.5V (simulating the battery being fully charged and reaching saturation voltage) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, it is determined that this function of the charging management device is qualified, otherwise it is determined that the charging management device is unqualified.

[0107] The battery energy distribution unit simulated by the charging test system 100 can also control the battery simulation unit 130 to generate an electrical signal corresponding to 15°C (simulating the low temperature state of the battery) and output it to the charging management device. At this time, if the charging management device outputs a heating signal, it is determined that this function of the charging management device is qualified, otherwise it is determined that the charging management device is unqualified.

[0108] The battery energy distribution unit simulated by the charging test system 100 can also control the battery simulation unit 130 to generate an electrical signal corresponding to 55°C (simulating a battery over-temperature state) and output it to the charging management device. At this time, if the charging management device outputs a stop charging signal, it is determined that this function of the charging management device is qualified, otherwise it is determined that the charging management device is unqualified.

[0109] The present application realizes the simulation of the charging process by simulating the communication between the charging pile and the charging management device; the simulation of different battery charging states is realized by simulating the battery energy distribution unit to output the simulated battery voltage and / or simulated battery temperature, thereby realizing the charging test of the battery management device. The charging test system 100 of the present application can accurately simulate the battery parameters during the charging process and improve the accuracy of the test results. The charging test system 100 of the present application does not require external battery packs, battery energy distribution units and other equipment, reducing the testing and development costs and occupied space of the charging management equipment. And the charging test system 100 of the present application does not need to be connected to high voltage, and is safer.

[0110] Reference Fig.10 In one embodiment, the charging test method further includes:

[0111] S5: Outputting a simulated battery current and / or a simulated battery insulation impedance to the charging management device, so that the charging management device performs a charging control operation according to the simulated battery current and / or the simulated battery insulation impedance.

[0112] The battery energy distribution unit simulated by the charging test system 100 can also output simulated battery current and / or simulated battery insulation impedance to the charging management device to simulate a battery current fault state or a battery insulation fault state. If the simulated battery current is outside the preset current threshold and / or the simulated battery insulation impedance is outside the preset impedance threshold, and the charging stop signal of the charging management device is received, it means that the battery management device can be powered off normally when the battery has an internal fault, then the charging management device is determined to be qualified, otherwise the charging management device is determined to be unqualified. Among them, the method of outputting the simulated battery current and / or the simulated battery insulation impedance can be to send a string of messages, and embed the corresponding size of the simulated battery current and / or simulated battery insulation impedance information into the message. For example, the battery energy distribution unit simulated by the charging test system 100 sends 001300H, and the "13" in the message represents the size of the simulated battery current. Among them, the simulated battery insulation impedance includes positive insulation impedance and negative insulation impedance.

[0113] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A charging test system for testing a charging management device, characterized in that: The charging test system comprises: Host computer; The communication interface circuit, the host computer is used to control the communication interface circuit to output an access signal; the host computer is also used to control the communication interface circuit to perform handshake communication with the charging management device according to the access signal; the host computer is also used to control the communication interface circuit to perform charging communication with the charging management device; A battery simulation unit, the battery simulation unit is used to be electrically connected to the charging management device; the battery simulation unit is used to simulate the battery voltage and / or simulate the battery temperature to the charging management device based on the control output of the host computer, so that the charging management device performs charging control operations according to the simulated battery voltage and / or the simulated battery temperature.

2. The charging test system according to claim 1, characterized in that: The host computer is also used to output a simulated battery current and / or a simulated battery insulation impedance, and the simulated battery current and / or the simulated battery insulation impedance are transmitted to the charging management device via the communication interface circuit, so that the charging management device performs a charging control operation according to the simulated battery current and / or the simulated battery insulation impedance.

3. The charging test system according to claim 2, characterized in that: If at least one of the simulated battery voltage, the simulated battery temperature, the simulated battery current and the simulated battery insulation impedance reaches a condition for stopping charging, and the communication interface circuit receives a stop charging signal from the charging management device, the host computer determines that the charging management device is qualified; if at least one of the simulated battery voltage, the simulated battery temperature, the simulated battery current and the simulated battery insulation impedance reaches a condition for stopping charging, and the communication interface circuit does not receive a stop charging signal from the charging management device, the host computer determines that the charging management device is unqualified; wherein the stop charging condition includes that the simulated battery voltage reaches a saturation voltage or is outside a preset voltage threshold, the simulated battery current is outside a preset current threshold, the simulated battery insulation impedance is outside a preset impedance threshold, and the simulated battery temperature is outside a preset temperature threshold.

4. The charging test system according to claim 2, characterized in that: The host computer is also used to control the communication interface circuit to output a stop charging instruction to the charging management device; After the host computer outputs a stop charging instruction, if the communication interface circuit receives a stop charging signal from the charging management device, the host computer determines that the charging management device is qualified; if the communication interface circuit does not receive a stop charging signal from the charging management device, the host computer determines that the charging management device is unqualified.

5. The charging test system according to claim 1, characterized in that: The communication interface circuit comprises: a first communication circuit, wherein the first communication circuit is used to transmit a first communication signal; a second communication circuit, wherein the second communication circuit is used to transmit a second communication signal; a transmission rate of the first communication signal is lower than a transmission rate of the second communication signal; An interface circuit, the interface circuit comprising a power pin and a data transmission pin; the host computer is used to control the power pin to output the access signal when the charging management device is connected; the data transmission pin is used to transmit the first communication signal or the second communication signal to the charging management device.

6. The charging test system according to claim 1, characterized in that: The battery simulation unit comprises: A voltage conversion circuit, the voltage conversion circuit is used to output a supply voltage of corresponding magnitude based on the control of the host computer; A battery voltage simulation circuit, the battery voltage simulation circuit is used to output the simulated battery voltage according to the power supply voltage; A temperature simulation circuit, the temperature simulation circuit is used to simulate the battery temperature of the corresponding temperature based on the control output of the host computer; A battery management unit is used to receive the simulated battery voltage and the simulated battery temperature, and output the simulated battery voltage and the simulated battery temperature to the charging management device.

7. The charging test system according to claim 6, characterized in that: The battery voltage simulation circuit includes a plurality of first resistors; the plurality of first resistors are used to generate a plurality of the simulated battery voltages according to the supply voltage.

8. The charging test system according to claim 1, characterized in that: The host computer is also used to output a simulated total battery voltage, a simulated DC output voltage, and a simulated load voltage to the charging management device, so that the charging management device performs a charging control operation according to the simulated total battery voltage, the simulated DC output voltage, and the simulated load voltage.

9. A charging test method, applied to a charging test system, wherein the charging test system is used to test a charging management device, characterized in that: The charging test method comprises: When detecting that the charging management device is connected, outputting a connection signal; Perform handshake communication with the charging management device based on the access signal; After the handshake is successful, charging communication is performed with the charging management device; The simulated battery voltage and / or the simulated battery temperature are output to the charge management device so that the charge management device performs a charge control operation according to the simulated battery voltage and / or the simulated battery temperature.

10. The charging test method according to claim 9, characterized in that: The charging test method further includes: The simulated battery current and / or the simulated battery insulation resistance are output to the charging management device, so that the charging management device performs a charging control operation according to the simulated battery current and / or the simulated battery insulation resistance.

Images