Test method for energy storage and charging system, and test system

Abstract

Disclosed in the present disclosure are a test method for an energy storage and charging system, and a test system. The test method comprises: when the remaining electric quantity of an energy storage apparatus is less than or equal to a first threshold value, a test machine acquiring first charging data of an energy management system instructing an alternating current-to-direct current converter to charge the energy storage apparatus, so as to determine whether an energy storage function of an energy storage and charging system is normal; and when a device to be charged is connected to a charging conversion apparatus, acquiring second charging data of the energy management system controlling the alternating current-to-direct current converter and / or the energy storage apparatus to charge said device, so as to determine whether a charging function of the energy storage and charging system is normal, wherein the energy storage function and the charging function are executed when a communication function between a battery management unit and the energy management system has passed a test, and the test of the communication function is completed on the basis of message data received by the energy management system and message data sent by the battery management unit. Therefore, the functions of the energy storage and charging system can be effectively tested, thereby improving the usage reliability of the energy storage and charging system.

Description

Test methods and test systems for energy storage and charging systems

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410925624.8, filed on July 11, 2024, entitled “Test Method and Test System for Storage and Charging System”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to a test method and test system for a battery storage and charging system. Background Technology

[0004] Currently, with the gradual application of integrated energy storage and charging systems, how to conduct thorough testing on these systems before they are put into use to ensure their normal operation after deployment is an urgent problem to be solved. Summary of the Invention

[0005] This disclosure provides a testing method and system for a storage and charging system, which can effectively test the functions of the storage and charging system and improve the reliability of its use.

[0006] The technical solution of this disclosure embodiment is implemented as follows:

[0007] In a first aspect, embodiments of this disclosure provide a testing method for a battery storage and charging system, applied to a testing machine; the battery storage and charging system includes an energy management system, an energy storage device, and a charging conversion device; the energy storage device includes a battery management unit; the method includes:

[0008] When the remaining power of the energy storage device is less than or equal to the first threshold, the first charging data is obtained, which instructs the energy management system to charge the energy storage device via the AC-to-DC converter, and the energy storage function of the energy storage system is determined to be normal based on the first charging data.

[0009] When the device to be charged is connected to the charging conversion device, the second charging data of the energy management system controlling the AC to DC converter and / or energy storage device to charge the device to be charged is obtained, and the charging function of the energy storage system is determined based on the second charging data.

[0010] The charging conversion device is connected to both the AC-to-DC converter and the energy storage device. The energy storage and charging functions are performed after the communication function between the battery management unit and the energy management system has been tested. The communication function test is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

[0011] In this embodiment, when the energy storage function of the energy storage and charging system is normal, the energy management system will instruct the AC-to-DC converter to charge the energy storage device when it detects that the remaining power of the energy storage device is less than or equal to a first threshold. Therefore, when the tester tests the energy storage function, it can acquire the first charging data when the remaining power of the energy storage device is less than or equal to the first threshold, indicating that the energy management system has instructed the AC-to-DC converter to charge the energy storage device. This first charging data is then used to determine whether the energy storage function of the energy storage and charging system is normal, i.e., whether the energy storage and charging system can automatically charge the energy storage device when the remaining power of the energy storage device is less than or equal to the first threshold. Under normal circumstances, the charging function of the energy storage and charging system supports three charging methods: charging the device to be charged using only the AC-to-DC converter, charging the device to be charged using only the energy storage device, and charging the device to be charged using only the energy storage device. Furthermore, by simultaneously charging the device under charge using an AC-to-DC converter and an energy storage device, the tester can acquire second charging data when the device under charge is connected. This data is used to control the AC-to-DC converter and / or the energy storage device to charge the device. Based on this second charging data, the tester can determine whether the charging system can normally execute the three charging methods. This effectively tests the automatic energy storage and charging functions of the charging system. Additionally, before testing the energy storage and charging functions, the communication function between the battery management unit and the energy management system can be tested based on the message data received by the energy management system and the message data sent by the battery management unit. This ensures that the communication function between the battery management unit and the energy management system is normal. Based on these tests, the reliability of the charging system can be effectively improved.

[0012] In some embodiments of this disclosure, the second charging data includes third charging information, fourth charging information, and fifth charging information; the method further includes:

[0013] A first charging instruction message is sent to the energy management system, so that the energy management system responds to the first charging instruction message, controls the AC to DC converter to charge the device to be charged, and obtains the third charging information; wherein, the first charging instruction message is used to indicate that the device to be charged is charged through the AC to DC converter.

[0014] Send a second charging instruction message to the energy management system so that the energy management system responds to the second charging instruction message, controls the energy storage device to charge the device to be charged through the battery management unit, and obtains the fourth charging information;

[0015] A third charging instruction message is sent to the energy management system, so that the energy management system responds to the third charging instruction message, controls the AC-to-DC converter and the battery management unit to charge the device to be charged through the AC-to-DC converter and the energy storage device, and obtains the fifth charging information.

[0016] In this embodiment, the tester can send a first charging instruction to the energy management system to instruct the energy storage device to be disabled and the device to be charged to be charged using only the AC-to-DC converter, and obtain relevant information about the charging process, i.e., the third charging information, thereby achieving effective testing of the charging function using only the AC-to-DC converter; the tester can send a second charging instruction to the energy management system to instruct the AC-to-DC converter to be disabled and the device to be charged to be charged using only the energy storage device, and obtain relevant information about the charging process, i.e., the fourth charging information, thereby achieving effective testing of the charging function using only the energy storage device; the tester can also send a third charging instruction to the energy management system to instruct the device to be charged to be charged using both the AC-to-DC converter and the energy storage device simultaneously, and obtain relevant information about the charging process, i.e., the fifth charging information, thereby achieving effective testing of the charging function using both the AC-to-DC converter and the energy storage device simultaneously.

[0017] In some embodiments of this disclosure, the energy storage device includes a battery management unit; the method further includes:

[0018] Before testing the energy storage and charging functions, the first message data of the energy management system and the second message data of the battery management unit are acquired; wherein, the second message data represents the message data generated by the battery management unit and sent to the energy management system; and the first message data represents the message data received by the energy management system from the battery management unit.

[0019] The data from the first message and the data from the second message are compared to obtain the comparison results;

[0020] If the comparison results show that the first message data and the second message data are the same, it is determined that the communication function between the battery management unit and the energy management system has passed the test.

[0021] In this embodiment, before testing the overall storage and charging function of the energy storage and charging system, a communication test can be performed first. When testing the communication function between the battery management unit and the energy management system in the energy storage device, the first message data received by the energy management system from the battery management unit and the second message data generated by the battery management unit and sent to the energy management system can be obtained. The first message data and the second message data are compared. If the first message data and the second message data are the same, it indicates that the communication between the battery management unit and the energy management system is correct, that is, the communication function passes the test, thereby improving the stability and reliability of the communication of the energy storage and charging system during use.

[0022] In some embodiments of this disclosure, after determining that the communication function between the battery management unit and the energy management system has passed the test, when the comparison result shows that the first message data and the second message data are the same, the method further includes:

[0023] The energy management system receives the protection commands generated in response to the fault message sent by the battery management unit.

[0024] Obtain fault messages from the battery management unit and determine the fault level of the fault messages;

[0025] If the protection command is determined to be the one corresponding to the fault level, the protection function of the energy storage device is deemed to have passed the test.

[0026] In this embodiment, the protection function of the energy storage device can also be tested before testing the energy storage and charging function of the entire energy storage and charging system. This involves obtaining the protection command generated by the energy management system in response to the fault message when the battery management unit sends a fault message to the energy management system, and determining the fault level of the fault message sent by the battery management unit. If the protection command generated by the energy management system is a command for handling faults at that fault level, then the protection function of the energy storage device is determined to have passed the test. This improves the energy storage and charging system's ability to handle faults in the energy storage device and enhances the safety of the energy storage and charging system.

[0027] In some embodiments of this disclosure, after determining that the communication function between the battery management unit and the energy management system has passed the test, when the comparison result shows that the first message data and the second message data are the same, the method further includes:

[0028] Acquire first voltage data of the energy storage device under different remaining power conditions and second voltage data of the battery in the energy storage device;

[0029] If the first voltage data meets the first voltage range and the second voltage data meets the second voltage range, the voltage of the energy storage device is determined to pass the test.

[0030] In this embodiment, after the communication function test is passed, the voltage range of the energy storage device can also be tested. The tester can acquire the first voltage data of the energy storage device under different remaining power and the second voltage data of the battery in the energy storage device. If the first voltage data and the second voltage data both conform to their respective first voltage range and second voltage range, the voltage of the energy storage device is determined to have passed the test, thereby improving the stability of the energy storage device during use.

[0031] In some embodiments of this disclosure, the charging conversion device includes a charging control unit; the method further includes:

[0032] When the device to be charged is connected to the charging conversion device, the first charging request information of the device to be charged and the second charging request information sent by the device to be charged are received by the charging control unit.

[0033] If the first charging request information and the second charging request information are the same, it is determined that the charging control unit has passed the test of responding to the charging request.

[0034] In this embodiment, the charging control unit in the charging conversion device can also be tested to see if it can correctly respond to the charging request of the device to be charged. When the device to be charged is connected to the charging conversion device, the tester can obtain the first charging request information of the device to be charged and the second charging request information received by the charging control unit from the device to be charged. If the first charging request information and the second charging request information are the same, it is determined that the charging control unit can correctly respond to the charging request, thereby improving the reliability of the energy storage and charging system.

[0035] In some embodiments of this disclosure, after determining that the charging control unit has passed the charging request response test when the first charging request information and the second charging request information are the same, the method further includes:

[0036] The charging control unit receives the first charging capability parameter sent by the energy management system; wherein the first charging capability parameter is calculated by the energy management system based on the received charging capability parameters of the energy storage device and the charging capability parameters of the AC-to-DC converter.

[0037] If the first charging capability parameter and the second charging capability parameter are the same, the charging capability parameter matching test is determined; wherein, the second charging parameter represents the charging capability parameter calculated based on the measured charging capability parameter of the energy storage device and the measured charging capability parameter of the AC to DC converter.

[0038] In this embodiment, after the charging control unit passes the charging request response test, the matching of charging capability parameters can be tested. The testing machine can acquire the first charging capability parameter received by the charging control unit from the energy management system. The first charging capability parameter is calculated by the energy management system based on the charging capability parameters of the energy storage device and the AC-to-DC converter. Then, the testing machine can perform actual measurements on the charging capability parameters of the energy storage device and the AC-to-DC converter to obtain the measured second charging capability parameter. If the first charging capability parameter is the same as the second charging capability parameter, the matching of charging capability parameters is determined to have passed the test, which can improve the reliability of the energy storage and charging system during charging.

[0039] In some embodiments of this disclosure, after determining that the charging capability parameter matching test has been passed when the first charging capability parameter is the same as the second charging capability parameter, the method further includes:

[0040] When charging a device to be charged via a charging conversion device, the output parameters of the charging conversion device sent by the charging control unit are obtained;

[0041] If the output parameter is less than or equal to the target parameter, the charging conversion device is determined to have passed the output parameter test; wherein the target parameter is the minimum value between the first charging request information and the first charging capability parameter.

[0042] In this embodiment, after the charging capability parameter matching test is passed, the output parameters of the charging conversion device can also be tested. The tester can obtain the output parameters of the charging conversion device during the charging process of the device to be charged using the charging conversion device through the charging control unit, and compare the output parameters with the target parameters. The target parameter is the minimum value between the first charging request information and the first charging capability parameter. If it is determined that the output parameter is less than or equal to the target parameter, it is determined that the charging conversion device has passed the output parameter test and can improve the charging reliability of the energy storage and charging system.

[0043] In some embodiments of this disclosure, after determining that the charging conversion device has passed the output parameter test when the output parameter is less than or equal to the target parameter, the method further includes:

[0044] When charging the device to be charged via an AC-to-DC converter, the first discharge parameters of the AC-to-DC converter are obtained;

[0045] When charging the device to be charged through the energy storage device, the second discharge parameters of the energy storage device are obtained;

[0046] When charging the device to be charged through an AC-to-DC converter and an energy storage device, the third discharge parameter of the AC-to-DC converter and the fourth discharge parameter of the energy storage device are obtained.

[0047] If the first and third discharge parameters are less than or equal to the charging capability parameters of the AC-to-DC converter, and the second and fourth discharge parameters are less than or equal to the charging capability parameters of the energy storage device, then the AC-to-DC converter and the energy storage device are determined to have passed the discharge parameter test.

[0048] In this embodiment, after determining that the charging conversion device has passed the output parameter test, the AC-to-DC converter and the energy storage device can also be tested for discharge parameters. The testing machine can acquire the first discharge parameter of the AC-to-DC converter when charging the device to be charged using only the AC-to-DC converter, and the first discharge parameter of the energy storage device when charging the device to be charged using only the energy storage device. When charging the device to be charged using both the AC-to-DC converter and the energy storage device, the third discharge parameter of the AC-to-DC converter and the fourth discharge parameter of the energy storage device can be acquired. Then, it is determined whether the discharge parameters of the AC-to-DC converter, including the first and third discharge parameters, are both less than or equal to the charging capacity parameter of the AC-to-DC converter, and whether the discharge parameters of the energy storage device, including the second and fourth discharge parameters, are both less than or equal to the charging capacity parameter of the energy storage device. If the discharge parameters all meet the condition, it can be determined that the AC-to-DC converter and the energy storage device have passed the discharge parameter test, thereby improving the stability of the charging system when charging the device to be charged using three charging methods.

[0049] In some embodiments of this disclosure, the charging conversion device includes at least two DC-DC converters connected in parallel; the method further includes:

[0050] When power is supplied to the device to be charged through a charging conversion device, the output data of at least two DC to DC converters are acquired.

[0051] The output difference information is determined based on the output data; wherein, the output difference information represents the difference between the currents output by at least two DC-to-DC converters.

[0052] If the output difference information is less than or equal to the second threshold, the charging conversion device is determined to have passed the circulating current test.

[0053] In this embodiment, a circulating current test can also be performed on at least two DC-to-DC converters connected in parallel in the charging conversion device. The tester can acquire the output data of each of the at least two DC-to-DC converters during the process of supplying power to the device to be charged through the charging conversion device, and determine the output difference information between the output currents of the at least two DC-to-DC converters based on the output data. If the output difference information is less than or equal to a second threshold, it can be determined that the charging conversion device passes the circulating current test and can improve the balance of the output current of the at least two DC-to-DC converters in the charging conversion device.

[0054] In some embodiments of this disclosure, the method further includes:

[0055] Write the first software version information to the battery management unit so that the battery management unit sends the first software version information to the energy management system;

[0056] Receive the second software version information sent by the energy management system;

[0057] If the first software version information and the second software version information are the same, the energy management system is determined to be read by the software version test.

[0058] In this embodiment, after the energy storage and charging system has passed multiple hardware tests, software tests can also be performed on the energy storage and charging system. The test machine can write first software version information to the battery management unit, and then after the battery management unit sends the first software version information to the energy management system, it can obtain the second software version information sent by the energy management system. If the first software version information and the second software version information are the same, it is determined that the energy management system has passed the software version reading test, which can improve the stability of software operation in the energy storage and charging system.

[0059] In some embodiments of this disclosure, the method further includes:

[0060] Send a high-voltage command to the energy management system;

[0061] If it is determined that the energy management system responds to the high-voltage command and controls the battery management unit to complete the high-voltage operation of the energy storage device, then the energy storage device passes the high-voltage test.

[0062] Send a high-voltage command to the energy management system;

[0063] If the energy management system responds to the high-voltage command and controls the battery management unit to complete the high-voltage operation of the energy storage device, then the energy storage device passes the high-voltage test.

[0064] In this embodiment, the energy storage device can also be tested for high voltage application and high voltage reduction. The testing machine can send a high voltage application command to the energy management system to determine whether the energy management system can respond to the high voltage application command and control the battery management unit to complete the high voltage application operation of the energy storage device. If the high voltage application operation can be completed, the high voltage application test is considered passed. The testing machine can also send a high voltage reduction command to the energy management system to determine whether the energy management system can respond to the high voltage reduction command and control the battery management unit to complete the high voltage reduction operation of the energy storage device. If the high voltage reduction operation can be completed, the high voltage reduction test is considered passed, thereby improving the stability of high voltage application and high voltage reduction operations.

[0065] In some embodiments of this disclosure, the method further includes:

[0066] With the energy storage device turned off, acquire the status detection information of the battery management unit from the energy management system;

[0067] If the status detection information indicates that the battery management unit is offline, then the battery management unit has passed the offline function test.

[0068] In this embodiment, the test machine can also acquire the status detection information of the energy management system on the battery management unit when the energy storage device is turned off, so as to determine whether the energy management system can accurately detect that the battery management unit in the energy storage device is offline, thereby effectively testing the offline function of the software in the battery management unit.

[0069] Secondly, embodiments of this disclosure provide a testing system, which includes a testing machine and a charging / storage system connected to the testing machine; wherein the charging / storage system includes an energy management system, an energy storage device, and a charging conversion device; the energy storage device includes a battery management unit; and the charging conversion device is connected to an AC-to-DC converter and the energy storage device respectively.

[0070] The tester is used to acquire first charging data when the remaining power of the energy storage device is less than or equal to a first threshold, and the energy management system controls the AC to DC converter to charge the energy storage device, so as to determine whether the energy storage function of the energy storage system is normal based on the first charging data.

[0071] The test unit is also used to acquire second charging data when the device to be charged is connected to the charging conversion device, and the energy management system controls the AC-to-DC converter and / or energy storage device to charge the device to be charged, and determines whether the charging function of the energy storage system is normal based on the second charging data; wherein, the energy storage function and the charging function are executed under the condition that the communication function between the battery management unit and the energy management system passes the test; the communication function test is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

[0072] In this embodiment, when the energy storage function of the energy storage and charging system is normal, the energy management system will instruct the AC-to-DC converter to charge the energy storage device when it detects that the remaining power of the energy storage device is less than or equal to a first threshold. Therefore, when the tester tests the energy storage function, it can acquire the first charging data when the remaining power of the energy storage device is less than or equal to the first threshold, indicating that the energy management system has instructed the AC-to-DC converter to charge the energy storage device. This first charging data is then used to determine whether the energy storage function of the energy storage and charging system is normal, i.e., whether the energy storage and charging system can automatically charge the energy storage device when the remaining power of the energy storage device is less than or equal to the first threshold. Under normal circumstances, the charging function of the energy storage and charging system supports three charging methods: charging the device to be charged using only the AC-to-DC converter, charging the device to be charged using only the energy storage device, and charging the device to be charged using only the energy storage device. Furthermore, by simultaneously charging the device under charge using an AC-to-DC converter and an energy storage device, the tester can acquire second charging data when the device under charge is connected. This data is used to control the AC-to-DC converter and / or the energy storage device to charge the device. Based on this second charging data, the tester can determine whether the charging system can normally execute the three charging methods. This effectively tests the automatic energy storage and charging functions of the charging system. Additionally, before testing the energy storage and charging functions, the communication function between the battery management unit and the energy management system can be tested based on the message data received by the energy management system and the message data sent by the battery management unit. This ensures that the communication function between the battery management unit and the energy management system is normal. Based on these tests, the reliability of the charging system can be effectively improved. Attached Figure Description

[0073] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure.

[0074] Figure 1 is a schematic diagram of the implementation process of the testing method for the storage and charging system proposed in the embodiments of this disclosure;

[0075] Figure 2 is a schematic diagram of the composition structure of the test system proposed in an embodiment of this disclosure;

[0076] Figure 3 is a schematic diagram of the composition structure of the storage and charging system proposed in an embodiment of this disclosure;

[0077] Figure 4 is a schematic diagram of the composition structure of the test system proposed in the embodiments of this disclosure. Detailed Implementation

[0078] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the relevant applications and not for limiting the applications. Furthermore, it should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings.

[0079] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used. Furthermore, batteries are increasingly being applied in energy storage. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing; for example, they can be used in integrated energy storage and charging systems.

[0080] Currently, with the gradual application of integrated energy storage and charging systems, how to conduct thorough testing on these systems before they are put into use to ensure their normal operation after deployment is an urgent problem to be solved.

[0081] To address the existing problems in the testing of current energy storage and charging systems, this disclosure provides a testing method and system for such systems. The testing system may include a testing machine and the energy storage and charging system. The system may include an energy management system, an energy storage device, and a charging conversion device. The energy storage device includes a battery management unit. When the remaining charge of the energy storage device is less than or equal to a first threshold, the testing machine can acquire first charging data indicating that the energy management system instructs the AC-to-DC converter to charge the energy storage device, and determine whether the energy storage function of the energy storage and charging system is normal based on the first charging data. When the device to be charged is connected to the charging conversion device, the testing machine can acquire second charging data indicating that the energy management system controls the AC-to-DC converter and / or the energy storage device to charge the device to be charged, and determine whether the charging function of the energy storage and charging system is normal based on the second charging data. The energy storage function and the charging function are executed after the communication function between the battery management unit and the energy management system passes the test. The communication function test is completed based on the message data received by the energy management system and the message data sent by the battery management unit. This enables effective testing of the functions of the energy storage and charging system, improving the reliability of the system.

[0082] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0083] The system description in this disclosure is similar to the description in the following method embodiments, and has similar beneficial effects. For technical details not disclosed in this system embodiment, please refer to the description in this disclosure of the method embodiments for understanding.

[0084] One embodiment of this disclosure provides a testing method for a storage and charging system, applied to a test machine within the testing system. The testing system further includes a storage and charging system, which may include an energy management system, an energy storage device, and a charging conversion device. As shown in FIG1, the testing method for the storage and charging system of the test machine may include the following steps:

[0085] Step 101: When the remaining power of the energy storage device is less than or equal to the first threshold, obtain the first charging data instructing the energy management system to charge the energy storage device via the AC-to-DC converter, and determine whether the energy storage function of the energy storage system is normal based on the first charging data.

[0086] In the embodiments of this disclosure, the tester can acquire first charging data when the remaining power of the energy storage device is less than or equal to a first threshold, instructing the energy management system (EMS) to charge the energy storage device via an AC-to-DC converter, and determine whether the energy storage function of the energy storage system is normal based on the first charging data.

[0087] In the embodiments of this disclosure, the test machine can be a host computer, capable of issuing control commands and having a screen display function.

[0088] In the embodiments of this disclosure, the energy storage device may include multiple batteries; the batteries may be assembled from one or more cells; the batteries may be individual battery cells. A battery cell refers to a basic unit capable of converting chemical energy into electrical energy, and can be used to manufacture battery modules or battery packs for supplying power to electrical devices. A battery cell may be a rechargeable battery, which is a battery cell that can be recharged after discharge to activate its active materials and continue to be used. Battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and this disclosure does not limit the types of batteries used.

[0089] In embodiments of this disclosure, the battery may also be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0090] In the embodiments of this disclosure, the remaining capacity of a battery can be determined by its state of charge (SOC), or the remaining capacity of the energy storage device can be determined based on the state of charge of each battery in the energy storage device.

[0091] In the embodiments of this disclosure, the value of the first threshold is not limited. For example, the first threshold can be 5%. When the remaining power of the energy storage device is 5% or less, it can be determined that the energy storage device is in a low power state. At this time, the energy storage and charging system can automatically charge the energy storage device. That is to say, the energy storage and charging system in this disclosure has the function of automatically replenishing the power of the energy storage device.

[0092] In the embodiments of this disclosure, the AC-to-DC converter can be a bidirectional AC-to-DC converter, i.e., a bidirectional alternating current (AC) / direct current (DC) converter. The number of bidirectional AC-to-DC converters is not limited in this disclosure and can be at least one. The test system also includes a DC bus. One end of the AC-to-DC converter can be connected to the DC bus, and the other end can be connected to a transformer. The transformer can be connected to the power grid to output AC power to the AC-to-DC converter through the power grid.

[0093] In the embodiments of this disclosure, the first charging data can be used to describe the process of charging the energy storage device based on the AC-to-DC converter; the first charging data may include the status information of each device in the energy storage and charging system, as well as the current, voltage, power and other information of the charging process during the process of charging the energy storage device based on the AC-to-DC converter.

[0094] In some embodiments of this disclosure, the tester can determine that the energy storage function of the energy storage system is normal if the charging process is normal and there are no faults in the devices based on the status information of each device in the first charging data.

[0095] In the embodiments of this disclosure, charging the energy storage device by an AC-to-DC converter means charging the energy storage device by obtaining electrical energy from the power grid.

[0096] Step 102: When the device to be charged is connected to the charging conversion device, acquire the second charging data of the energy management system controlling the AC-to-DC converter and / or the energy storage device to charge the device to be charged, and determine whether the charging function of the energy storage system is normal based on the second charging data; wherein, the charging conversion device is connected to the AC-to-DC converter and the energy storage device respectively; the energy storage function and the charging function are executed after the communication function between the battery management unit and the energy management system passes the test; the communication function test is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

[0097] In the embodiments of this disclosure, the tester can acquire second charging data when the device to be charged is connected to the charging conversion device, and the energy management system controls the AC-to-DC converter and / or the energy storage device to charge the device to be charged. Based on the second charging data, the tester can determine whether the charging function of the energy storage system is normal. The charging conversion device is connected to the AC-to-DC converter and the energy storage device respectively. The energy storage function and the charging function are executed after the communication function between the battery management unit and the energy management system passes the test. The communication function test is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

[0098] In the embodiments of this disclosure, the execution order of the energy storage function test and the charging function test is not limited. The charging function test can be performed after the energy storage function test or after the charging function test.

[0099] In the embodiments of this disclosure, the device to be charged refers to a device connected to the energy storage and charging system for charging. This disclosure does not limit the device to be charged; for example, the device to be charged can be an electric vehicle.

[0100] In embodiments of this disclosure, the charging conversion device may include at least two DC-DC converters, i.e. bidirectional DC / DC converters. The number of bidirectional DC / DC converters is not limited in this disclosure, for example, it may include eight bidirectional DC / DC converters. The charging conversion device may also include a charging control unit (CCU), which can be used to control the charging conversion device.

[0101] In embodiments of this disclosure, the energy storage device may include a Battery Management System (BMS) that can control the energy storage device.

[0102] In the embodiments of this disclosure, the energy management system can be used to control various devices or sub-modules in the energy storage and charging system. For example, the energy management system can be used to control the battery management unit and the charging control unit to realize the control of the energy storage device and the charging conversion device.

[0103] In some embodiments of this disclosure, the second charging data can be used to describe the charging process of the device to be charged based on the AC-to-DC converter and / or energy storage device; the second charging data may include the status information of each device in the charging system, as well as the current, voltage, power and other information of the charging process during the charging process of the device to be charged based on the AC-to-DC converter and / or energy storage device.

[0104] In some embodiments of this disclosure, the second charging data may include third charging information, fourth charging information, and fifth charging information.

[0105] In some embodiments of this disclosure, the test machine can send a first charging instruction message to the energy management system, so that the energy management system responds to the first charging instruction message, controls the AC-to-DC converter to charge the device to be charged, and obtains third charging information; wherein, the first charging instruction message is used to indicate that the device to be charged is charged through the AC-to-DC converter.

[0106] In the embodiments of this disclosure, charging the device to be charged by using an AC-to-DC converter means charging the device to be charged by obtaining electrical energy from the power grid.

[0107] In the embodiments of this disclosure, when testing a charging method that charges the device to be charged only through an AC-to-DC converter, the tester can send a first charging instruction message to the energy management system to shield the energy storage device and charge the device to be charged only through the AC-to-DC converter.

[0108] In the embodiments of this disclosure, the third charging information can be used to describe the charging process of the device to be charged based on the AC-to-DC converter; the third charging information may include the status information of each device in the energy storage system, as well as the current, voltage, power and other information of the charging process during the charging process of the device to be charged based on the AC-to-DC converter.

[0109] In some embodiments of this disclosure, the test machine can send a second charging instruction message to the energy management system, so that the energy management system responds to the second charging instruction message, controls the energy storage device to charge the device to be charged through the battery management unit, and obtains the fourth charging information.

[0110] In embodiments of this disclosure, the second charging indication information is used to indicate that the device to be charged is charged through the energy storage device.

[0111] In some embodiments of this disclosure, when it is determined, based on third charging information, that during the charging process of the device to be charged via the AC-to-DC converter, no faults occur in any of the devices in the energy storage system, and the current, voltage, and power of the charging process do not exceed their respective load values, it can be determined that the charging method of charging the device to be charged via the AC-to-DC converter has passed the test.

[0112] In the embodiments of this disclosure, when testing a charging method in which the device to be charged is charged only through the energy storage device, the tester can send a second charging instruction message to the energy management system to shield the AC-to-DC converter and charge the device to be charged only through the energy storage device.

[0113] In the embodiments of this disclosure, the fourth charging information can be used to describe the process of charging the device to be charged based on the energy storage device; the fourth charging information may include the status information of each device in the energy storage and charging system, as well as information such as current, voltage, and power during the charging process.

[0114] In some embodiments of this disclosure, when it is determined, based on the fourth charging information, that during the charging process of the device to be charged based on the energy storage device, no faults occur in any of the devices in the energy storage and charging system, and the current, voltage, and power of the charging process do not exceed their respective load values, it can be determined that the charging method of charging the device to be charged through the energy storage device has passed the test.

[0115] In some embodiments of this disclosure, the test machine can send a third charging instruction message to the energy management system, so that the energy management system responds to the third charging instruction message, controls the AC-to-DC converter and the battery management unit to charge the device to be charged through the AC-to-DC converter and the energy storage device, and obtains the fifth charging information.

[0116] In embodiments of this disclosure, the third charging indication information is used to indicate that the device to be charged is charged through an AC-to-DC converter and an energy storage device.

[0117] In the embodiments of this disclosure, the fifth charging information can be used to describe the charging process of the device to be charged based on the AC-to-DC converter and the energy storage device; the fifth charging information may include the status information of each device in the energy storage system, as well as the current, voltage, power and other information of the charging process during the charging process of the device to be charged based on the AC-to-DC converter and the energy storage device.

[0118] In some embodiments of this disclosure, when it is determined, based on the fifth charging information, that during the charging process of the device to be charged based on the AC-to-DC converter and the energy storage device, no faults occur in any of the devices in the energy storage system, and the current, voltage, and power of the charging process do not exceed their respective load values, it can be determined that the charging method of charging the device to be charged through the AC-to-DC converter and the energy storage device has passed the test.

[0119] In embodiments of this disclosure, the energy storage device may include a battery management unit; the testing method for the energy storage and charging system of the testing machine may further include the following steps:

[0120] Step 201: Before testing the energy storage and charging functions, acquire the first message data of the energy management system and the second message data of the battery management unit; wherein, the second message data represents the message data generated by the battery management unit and sent to the energy management system; the first message data represents the message data received by the energy management system from the battery management unit.

[0121] In embodiments of this disclosure, the tester can acquire first message data of the energy management system and second message data of the battery management unit before testing the energy storage function and the charging function; wherein, the second message data represents message data generated by the battery management unit and sent to the energy management system; and the first message data represents message data received by the energy management system from the battery management unit.

[0122] In some embodiments of this disclosure, the testing of energy storage function and the testing of charging function are both part of the overall testing of the energy storage and charging system. Before the overall testing, hardware testing and software testing are required, and the testing of communication function is part of the hardware testing.

[0123] In some embodiments of this disclosure, the tester can test the communication function between the battery management unit and the energy management system when testing the communication function of the energy storage and charging system.

[0124] In some embodiments of this disclosure, if the battery management unit is unable to send message data to the energy management system, it can be directly determined that the test of the communication function between the battery management unit and the energy management system has failed.

[0125] Step 202: Compare the data of the first message and the data of the second message to obtain the comparison results.

[0126] In the embodiments of this disclosure, the test machine can compare the first message data and the second message data of the energy management system after acquiring the first message data and the second message data of the battery management unit to obtain the comparison result.

[0127] Step 203: If the comparison results show that the first message data and the second message data are the same, it is determined that the communication function between the battery management unit and the energy management system has passed the test.

[0128] In the embodiments of this disclosure, the tester can compare the first message data and the second message data. After obtaining the comparison result, if the first message data and the second message data are the same, it is determined that the communication function between the battery management unit and the energy management system has passed the test.

[0129] In embodiments of this disclosure, if the comparison result shows that the first message data and the second message data are different, it is determined that the test of the communication function between the battery management unit and the energy management system has failed.

[0130] In embodiments of this disclosure, after the test machine determines that the communication function between the battery management unit and the energy management system has passed the test, i.e., after step 203, if the comparison result shows that the first message data and the second message data are the same, the following steps may also be included:

[0131] Step 301: Obtain the protection command generated by the energy management system in response to the fault message sent by the battery management unit.

[0132] In the embodiments of this disclosure, if the comparison result shows that the first message data and the second message data are the same, after the test machine determines that the communication function between the battery management unit and the energy management system has passed the test, it can also obtain the protection command generated by the energy management system in response to the fault message sent by the battery management unit.

[0133] In embodiments of this disclosure, the fault message may correspond to the fault level of the battery management unit; the battery management unit may experience faults of levels 1 to 7, that is, the fault level may be any level from 1 to 7, and the generated fault message may include first-level information for indicating the fault level.

[0134] In embodiments of this disclosure, protection instructions are used to instruct the storage and charging system to perform protection measures of a corresponding level. The protection instructions may include second-level information for indicating the fault level.

[0135] Step 302: Obtain the fault message from the battery management unit and determine the fault level of the fault message.

[0136] In the embodiments of this disclosure, after the test machine obtains the protection command generated by the energy management system in response to the fault message sent by the battery management unit, it can obtain the fault message of the battery management unit and determine the fault level of the fault message.

[0137] Step 303: If the protection command is determined to be a protection command corresponding to the fault level, the protection function of the energy storage device is determined to have passed the test.

[0138] In the embodiments of this disclosure, after the test machine acquires the fault message of the battery management unit and determines the fault level of the fault message, it can determine that the protection function of the energy storage device passes the test if the protection instruction is determined to be the protection instruction corresponding to the fault level.

[0139] For example, if a Level 2 fault occurs in the battery management unit and a corresponding fault message is generated and sent to the energy management system, and the energy management system responds to the fault message and triggers a Level 2 fault protection command, then it can be determined that the protection function of the energy storage device has passed the test.

[0140] In some embodiments of this disclosure, the tester can also test the protection function of the energy storage and charging system. During the charging process of the energy storage device, the tester can trigger a fault in the battery management unit, and then, upon receiving the triggering information from the energy management system to trigger corresponding protection measures, determine that the protection function during the charging process of the energy storage device has passed the test.

[0141] For example, during the charging process of the energy storage device, the battery management unit may experience faults such as individual cell overvoltage, system overvoltage, overcurrent, individual cell overtemperature, system overtemperature, and SOC exceeding the upper limit.

[0142] In some embodiments of this disclosure, the test machine can also trigger a fault in the battery management unit during the charging process of the device to be charged using the energy storage and charging system, and then, upon receiving the triggering information from the energy management system to trigger corresponding protection measures, determine that the protection function during the charging process of the device to be charged has passed the test.

[0143] For example, during the charging process of the device to be charged using the energy storage and charging system, faults in the battery management unit may include individual cell undervoltage, system undervoltage, individual cell overtemperature, system overtemperature, and SOC below the lower limit.

[0144] In some embodiments of this disclosure, the energy storage and charging system may further include a liquid cooling module and a fire suppression module; upon receiving a fault message, the energy management system may control all devices or sub-modules in the energy storage and charging system, including the liquid cooling module and the fire suppression module, to perform corresponding protection measures.

[0145] In some embodiments of this disclosure, after the test machine determines that the communication function between the battery management unit and the energy management system has passed the test, i.e., after step 203, when the comparison result shows that the first message data and the second message data are the same, the following steps may also be included:

[0146] Step 401: Obtain the first voltage data of the energy storage device under different remaining power conditions and the second voltage data of the battery in the energy storage device.

[0147] In the embodiments of this disclosure, if the comparison result shows that the first message data and the second message data are the same, the test machine determines that the communication function between the battery management unit and the energy management system has passed the test. After that, the test machine can obtain the first voltage data of the energy storage device under different remaining power and the second voltage data of the battery in the energy storage device.

[0148] In some embodiments of this disclosure, the hardware testing items may also include voltage testing of the energy storage device.

[0149] In embodiments of this disclosure, the first voltage data may include voltage data of the energy storage device under different remaining charge levels.

[0150] In embodiments of this disclosure, the second voltage data may include the voltage data of each battery within the energy storage device under different remaining charge conditions.

[0151] Step 402: If the first voltage data meets the first voltage range and the second voltage data meets the second voltage range, determine that the voltage of the energy storage device passes the test.

[0152] In the embodiments of this disclosure, after the testing machine acquires the first voltage data of the energy storage device under different remaining power and the second voltage data of the battery in the energy storage device, it can determine that the voltage of the energy storage device passes the test if the first voltage data conforms to the first voltage range and the second voltage data conforms to the second voltage range.

[0153] In embodiments of this disclosure, the first voltage range may include a voltage range for measuring the voltage status of the energy storage device under different remaining power conditions. The value of the first voltage range is not limited in this disclosure. For example, the first voltage range may include a1 to b1 for measuring the voltage of the energy storage device when the SOC of the energy storage device is 10%, and a2 to b2 for measuring the voltage of the energy storage device when the SOC of the energy storage device is 50%.

[0154] In embodiments of this disclosure, the second voltage range may include a voltage range for measuring the voltage of the battery in the energy storage device under different remaining charge conditions. The value of the second voltage range is not limited in this disclosure. For example, the second voltage range may include a3 to b3 for measuring the battery voltage in the energy storage device when the SOC of the energy storage device is 10%, and a4 to b4 for measuring the battery voltage in the energy storage device when the SOC of the energy storage device is 50%.

[0155] For example, the tester obtains the voltage of the energy storage device when the SOC is 10% as c1, a1 < c1 < b1; the voltage of the energy storage device when the SOC is 50% as c2, a2 ​​< c2 < b2; and also obtains the internal battery voltage of the energy storage device when the SOC is 10% as c3, a3 < c3 < b3, and the internal battery voltage of the energy storage device when the SOC is 50% as c4, a4 ​​< c4 < b4. Then it can be determined that the voltage of the energy storage device passes the test.

[0156] In embodiments of this disclosure, the charging conversion device may include a charging control unit; the testing method for the charging storage system of the testing machine may further include the following steps:

[0157] Step 501: Obtain the first charging request information of the device to be charged when the device to be charged is connected to the charging conversion device, and the second charging request information sent by the device to be charged received by the charging control unit.

[0158] In the embodiments of this disclosure, the test machine can acquire the first charging request information of the device to be charged when the device to be charged is connected to the charging conversion device, and the second charging request information sent by the device to be charged received by the charging control unit.

[0159] In embodiments of this disclosure, the hardware test items may further include testing the charging control unit's response to charging requests.

[0160] In embodiments of this disclosure, the first charging request information may include information about the charging current, power, and voltage requested by the device to be charged.

[0161] In embodiments of this disclosure, the second charging request information represents the charging request information sent by the device to be charged, received by the charging control unit.

[0162] Step 502: If the first charging request information and the second charging request information are the same, determine that the charging control unit has passed the charging request response test.

[0163] In the embodiments of this disclosure, the test machine can, after acquiring the first charging request information of the device to be charged when the device to be charged is connected to the charging conversion device, and the second charging request information sent by the device to be charged received by the charging control unit, determine that the charging control unit has passed the test of responding to the charging request if the first charging request information and the second charging request information are the same.

[0164] In some embodiments of this disclosure, after the test machine determines that the charging control unit has passed the charging request response test when the first charging request information and the second charging request information are the same, i.e. after step 502, the following steps may also be included:

[0165] Step 601: Obtain the first charging capability parameter sent by the energy management system to the charging control unit; wherein, the first charging capability parameter is calculated by the energy management system based on the received charging capability parameters of the energy storage device and the charging capability parameters of the AC to DC converter.

[0166] In the embodiments of this disclosure, when the first charging request information and the second charging request information are the same, after the test machine determines that the charging control unit has passed the charging request response test, it can obtain the first charging capability parameter sent by the energy management system received by the charging control unit; wherein, the first charging capability parameter is calculated by the energy management system based on the received charging capability parameters of the energy storage device and the charging capability parameters of the AC to DC converter.

[0167] In some embodiments of this disclosure, the hardware test items may also include a test of the matching of charging capability parameters.

[0168] In some embodiments of this disclosure, the energy management system can perform an addition operation on the received charging capability parameters of the energy storage device and the charging capability parameters of the AC-to-DC converter to obtain a first charging capability parameter.

[0169] In the embodiments of this disclosure, the charging capability parameter of the energy storage device represents the maximum charging capability that the energy storage device can support.

[0170] In embodiments of this disclosure, the charging capability parameter of the AC-to-DC converter represents the maximum charging capability that the AC-to-DC converter can support.

[0171] Step 602: If the first charging capability parameter and the second charging capability parameter are the same, determine whether the charging capability parameter matching test is passed; wherein, the second charging parameter represents the charging capability parameter calculated based on the measured charging capability parameter of the energy storage device and the measured charging capability parameter of the AC to DC converter.

[0172] In the embodiments of this disclosure, after the test machine obtains the first charging capability parameter sent by the energy management system to the charging control unit, it can determine whether the charging capability parameter matching test has been passed if the first charging capability parameter is the same as the second charging capability parameter; wherein, the second charging parameter represents the charging capability parameter calculated based on the measured charging capability parameter of the energy storage device and the measured charging capability parameter of the AC to DC converter.

[0173] In some embodiments of this disclosure, the testing machine can perform an addition operation on the measured charging capacity parameters of the energy storage device and the measured charging capacity parameters of the AC-to-DC converter to obtain a second charging parameter.

[0174] In some embodiments of this disclosure, if the first charging capability parameter is different from the second charging capability parameter, the charging capability parameter matching test is determined to be unsuccessful.

[0175] In some embodiments of this disclosure, after the tester determines that the charging capability parameter matching test has been passed when the first charging capability parameter is the same as the second charging capability parameter, i.e., after step 602, the following steps may also be included:

[0176] Step 701: When charging the device to be charged through the charging conversion device, obtain the output parameters of the charging conversion device sent by the charging control unit.

[0177] In the embodiments of this disclosure, after the tester determines that the charging capability parameter matching test has been passed when the first charging capability parameter is the same as the second charging capability parameter, it can obtain the output parameters of the charging conversion device sent by the charging control unit when charging the device to be charged through the charging conversion device.

[0178] In some embodiments of this disclosure, the hardware test items may also include testing of output parameters.

[0179] In embodiments of this disclosure, the output parameters may include information on the charging current, power, and voltage output by the charging conversion device.

[0180] Step 702: If the output parameter is less than or equal to the target parameter, determine that the charging conversion device has passed the output parameter test; wherein, the target parameter is the minimum value between the first charging request information and the first charging capability parameter.

[0181] In the embodiments of this disclosure, when the test machine charges the device to be charged through the charging conversion device, after obtaining the output parameters of the charging conversion device sent by the charging control unit, it can determine that the charging conversion device has passed the output parameter test if the output parameters are less than or equal to the target parameters; wherein, the target parameters are the minimum value between the first charging request information and the first charging capability parameters.

[0182] In some embodiments of this disclosure, after the test machine determines that the charging conversion device has passed the output parameter test when the output parameter is less than or equal to the target parameter, i.e., after step 702, the following steps may also be included:

[0183] Step 801: When charging the device to be charged through the AC-to-DC converter, obtain the first discharge parameters of the AC-to-DC converter.

[0184] In the embodiments of this disclosure, after the tester determines that the charging conversion device has passed the output parameter test when the output parameter is less than or equal to the target parameter, it can obtain the first discharge parameter of the AC-to-DC converter when the device to be charged is charged through the AC-to-DC converter.

[0185] In embodiments of this disclosure, the first discharge parameters may include information such as discharge current, voltage, and power during the charging process of the device to be charged via an AC-to-DC converter.

[0186] Step 802: When charging the device to be charged through the energy storage device, obtain the second discharge parameters of the energy storage device.

[0187] In embodiments of this disclosure, the test machine can acquire the second discharge parameters of the energy storage device while charging the device to be charged via the energy storage device.

[0188] In embodiments of this disclosure, the second discharge parameter may include information such as discharge current, voltage, and power during the charging process of the device to be charged via the energy storage device.

[0189] Step 803: When charging the device to be charged through the AC-to-DC converter and the energy storage device, obtain the third discharge parameter of the AC-to-DC converter and the fourth discharge parameter of the energy storage device.

[0190] In embodiments of this disclosure, the tester can acquire the third discharge parameters of the AC-to-DC converter and the fourth discharge parameters of the energy storage device while charging the device to be charged via the AC-to-DC converter and the energy storage device.

[0191] In embodiments of this disclosure, the fourth discharge parameter may include information such as discharge current, voltage, and power during the charging process of the device to be charged via an AC-to-DC converter and an energy storage device.

[0192] Step 804: If the first discharge parameter and the third discharge parameter are less than or equal to the charging capability parameter of the AC-to-DC converter, and the second discharge parameter and the fourth discharge parameter are less than or equal to the charging capability parameter of the energy storage device, determine that the AC-to-DC converter and the energy storage device have passed the discharge parameter test.

[0193] In the embodiments of this disclosure, when the tester charges the device to be charged via an AC-to-DC converter, it acquires the first discharge parameter of the AC-to-DC converter; when the device to be charged via an energy storage device, it acquires the second discharge parameter of the energy storage device; and when the device to be charged via both the AC-to-DC converter and the energy storage device, it acquires the third discharge parameter of the AC-to-DC converter and the fourth discharge parameter of the energy storage device. Therefore, if the first and third discharge parameters are less than or equal to the charging capability parameter of the AC-to-DC converter, and the second and fourth discharge parameters are less than or equal to the charging capability parameter of the energy storage device, it can be determined that the AC-to-DC converter and the energy storage device have passed the discharge parameter test.

[0194] In embodiments of this disclosure, the charging conversion device includes at least two DC-DC converters connected in parallel; the testing method for the charging storage system of the testing machine may further include the following steps:

[0195] Step 901: While supplying power to the device to be charged through the charging conversion device, acquire the output data of at least two DC-to-DC converters.

[0196] In embodiments of this disclosure, the tester can acquire the output data of at least two DC-to-DC converters while supplying power to the device to be charged via a charging conversion device.

[0197] In the embodiments of this disclosure, the hardware test items may also include a circulating current test; since common fast charging piles are usually 120kW to 200kW, the power is low and there is no need for a circulating current test; since the application itself has at least two DC to DC converters in the charging conversion device, it has the characteristics of high power, such as 480kW, so there may be a problem of current imbalance between DC to DC converters. In order to verify the current balance performance, the tester can perform a circulating current test.

[0198] In embodiments of this disclosure, the output data may be information related to the current output by the DC-DC converter.

[0199] Step 902: Determine the output difference information based on the output data; wherein, the output difference information represents the difference information between the currents output by at least two DC-to-DC converters.

[0200] In embodiments of this disclosure, the tester can acquire the output data of at least two DC-to-DC converters after supplying power to the device to be charged via a charging conversion device, and then determine the output difference information based on the output data; wherein the output difference information represents the difference information between the currents output by the at least two DC-to-DC converters.

[0201] Step 903: If the output difference information is less than or equal to the second threshold, determine that the charging conversion device has passed the circulating current test.

[0202] In embodiments of this disclosure, after determining the output difference information based on the output data, the tester can determine that the charging conversion device has passed the circulating current test if the output difference information is less than or equal to a second threshold.

[0203] In the embodiments of this disclosure, the value of the second threshold is not limited. For example, the second threshold is 3%. If the difference in the output current of the DC-DC converter is less than or equal to 3%, it can be determined that the charging conversion device has passed the circulating current test.

[0204] In some embodiments of this disclosure, if the output difference information is greater than a second threshold, it is determined that the charging conversion device fails the circulating current test.

[0205] In embodiments of this disclosure, the testing method for the storage and charging system of the testing machine may further include the following steps:

[0206] Step 1001: Write the first software version information to the battery management unit so that the battery management unit sends the first software version information to the energy management system.

[0207] In embodiments of this disclosure, the test machine may also write first software version information to the battery management unit, so that the battery management unit sends the first software version information to the energy management system.

[0208] In some embodiments of this disclosure, the first software version information may be the software version number of the battery management unit.

[0209] Step 1002: Receive the second software version information sent by the energy management system.

[0210] In the embodiments of this disclosure, the test machine can write first software version information to the battery management unit so that the battery management unit sends the first software version information to the energy management system, and then receive second software version information sent by the energy management system.

[0211] In embodiments of this disclosure, the second software version information represents the software version information received by the energy management system from the battery management unit.

[0212] Step 1003: If the first software version information and the second software version information are the same, determine the test of reading the software version by the energy management system.

[0213] In the embodiments of this disclosure, the test machine can determine the test read by the energy management system through the software version if the first software version information and the second software version information are the same after receiving the second software version information sent by the energy management system.

[0214] In embodiments of this disclosure, if the first software version information and the second software version information are different, it is determined that the energy management system does not pass the software version reading test.

[0215] In embodiments of this disclosure, the testing method for the storage and charging system of the testing machine may further include the following steps:

[0216] Step 1101: Send a high-voltage command to the energy management system.

[0217] In embodiments of this disclosure, the test machine can also send a high-voltage command to the energy management system.

[0218] Step 1102: If it is determined that the energy management system responds to the high-voltage command and controls the battery management unit to complete the high-voltage operation of the energy storage device, then the energy storage device passes the high-voltage test.

[0219] In the embodiments of this disclosure, after the tester sends a high-voltage command to the energy management system, and determines that the energy storage device has passed the high-voltage test, if the tester determines that the energy management system has responded to the high-voltage command by controlling the battery management unit to complete the high-voltage operation of the energy storage device.

[0220] In the embodiments of this disclosure, if the energy management system fails to control the battery management unit to complete the high-voltage operation of the energy storage device after the test machine sends a high-voltage command to the energy management system, it can be determined that the energy storage device fails the high-voltage test.

[0221] Step 1103: Send a high-voltage command to the energy management system.

[0222] In embodiments of this disclosure, the test machine can also send a high-voltage command to the energy management system.

[0223] Step 1104: If it is determined that the energy management system responds to the high-voltage command and controls the battery management unit to complete the high-voltage operation of the energy storage device, then the energy storage device passes the high-voltage test.

[0224] In the embodiments of this disclosure, after the tester sends a high-voltage command to the energy management system, and determines that the energy storage device has passed the high-voltage test, if the tester determines that the energy management system has responded to the high-voltage command by controlling the battery management unit to complete the high-voltage operation of the energy storage device.

[0225] In the embodiments of this disclosure, if the energy management system fails to control the battery management unit to complete the high-voltage operation of the energy storage device after the test machine sends a high-voltage command to the energy management system, it can be determined that the energy storage device fails the high-voltage test.

[0226] In embodiments of this disclosure, the testing method for the storage and charging system of the testing machine may further include the following steps:

[0227] Step 1201: With the energy storage device turned off, obtain the status detection information of the battery management unit from the energy management system.

[0228] In embodiments of this disclosure, the test machine can also acquire the status detection information of the battery management unit from the energy management system when the energy storage device is turned off.

[0229] In embodiments of this disclosure, status detection information can be used to determine the status of the battery management unit, including online status and offline status.

[0230] Step 1202: If the status detection information indicates that the battery management unit is in an offline state, determine that the battery management unit has passed the offline function test.

[0231] In the embodiments of this disclosure, the test machine can obtain the status detection information of the energy management system on the battery management unit when the energy storage device is turned off, and determine that the battery management unit has passed the offline function test when the status detection information indicates that the battery management unit is in an offline state.

[0232] In the embodiments of this disclosure, after the test machine obtains the status detection information of the energy management system on the battery management unit when the energy storage device is turned off, it determines that the battery management unit fails the offline function test if the status detection information indicates that the battery management unit is not offline.

[0233] The application provides a testing method for a energy storage and charging system. When the energy storage function of the system is normal, the energy management system will instruct the AC-to-DC converter to charge the energy storage device when the remaining power of the energy storage device is less than or equal to a first threshold. Therefore, when testing the energy storage function, the testing machine can acquire first charging data indicating that the energy management system instructs the AC-to-DC converter to charge the energy storage device when the remaining power of the energy storage device is less than or equal to the first threshold. This first charging data allows the testing machine to determine whether the energy storage function of the system is normal, i.e., whether the system can automatically charge the energy storage device when the remaining power is less than or equal to the first threshold. Under normal circumstances, the charging function of the system supports three charging methods: charging the device using only the AC-to-DC converter, charging the device using only the energy storage device, and charging the device using only the energy storage device. The device charges the device to be charged and simultaneously uses an AC-to-DC converter and an energy storage device to charge the device to be charged. Therefore, when testing the charging function of the energy storage and charging system, the tester can acquire second charging data when the device to be charged is connected, controlling the AC-to-DC converter and / or the energy storage device to charge the device. Based on the second charging data, it can determine whether the energy storage and charging system can normally execute the three charging methods. This enables effective testing of the automatic energy storage and charging functions of the energy storage and charging system. In addition, before testing the energy storage and charging functions, the communication function between the battery management unit and the energy management system can be tested based on the message data received by the energy management system and the message data sent by the battery management unit to ensure that the communication function between the battery management unit and the energy management system is normal. Based on the above tests, the reliability of the energy storage and charging system can be effectively improved.

[0234] Based on the above embodiments, in another embodiment of this disclosure, a test system is provided. As shown in FIG2, the test system 0 may include a test machine 1 and a storage and charging system 2 connected to the test machine 1. As shown in FIG3, the storage and charging system 2 may include an energy management system 21, an energy storage device 22, a charging conversion device 23, and an AC to DC converter 24.

[0235] In embodiments of this disclosure, the charging conversion device is connected to both an AC-to-DC converter and an energy storage device.

[0236] The tester can be used to acquire first charging data when the remaining power of the energy storage device is less than or equal to a first threshold, and the energy management system controls the AC to DC converter to charge the energy storage device, so as to determine whether the energy storage function of the energy storage system is normal based on the first charging data.

[0237] The tester can also be used to acquire second charging data when the device to be charged is connected to the charging conversion device, and the energy management system controls the AC-to-DC converter and / or energy storage device to charge the device to be charged, and determines whether the charging function of the energy storage system is normal based on the second charging data; wherein, the energy storage function and the charging function are executed under the condition that the communication function between the battery management unit and the energy management system passes the test; the communication function test is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

[0238] In embodiments of this disclosure, the energy storage device may include a battery management unit; the charging conversion device may include a charging control unit.

[0239] The battery management unit can be used to control the energy storage device to charge the device to be charged;

[0240] The charging control unit can be used to control the charging conversion device to output charging current to the device to be charged.

[0241] In embodiments of this disclosure, the energy storage and charging system may further include a charging gun; the charging gun is connected to a charging conversion device; and the AC-to-DC converter, the energy storage device, and the charging conversion device are connected to a DC bus.

[0242] In embodiments of this disclosure, the AC-to-DC converter may include an AC-to-DC converter.

[0243] In some embodiments of this disclosure, the second charging data may include third charging information, fourth charging information, and fifth charging information; the tester may also be used to send first charging instruction information to the energy management system, so that the energy management system responds to the first charging instruction information, controls the AC-to-DC converter to charge the device to be charged, and obtains the third charging information; wherein, the first charging instruction information is used to indicate that the device to be charged is charged through the AC-to-DC converter.

[0244] In some embodiments of this disclosure, the test machine can also be used to send a second charging instruction message to the energy management system, so that the energy management system responds to the second charging instruction message, controls the energy storage device to charge the device to be charged through the battery management unit, and obtains the fourth charging information; wherein, the second charging instruction message is used to indicate that the device to be charged is charged through the energy storage device.

[0245] In some embodiments of this disclosure, the test machine can also be used to send a third charging instruction message to the energy management system, so that the energy management system responds to the third charging instruction message, controls the AC-to-DC converter and the battery management unit to charge the device to be charged through the AC-to-DC converter and the energy storage device, and obtains the fifth charging information.

[0246] In some embodiments of this disclosure, the test machine can also be used to acquire first message data of the energy management system and second message data of the battery management unit before testing the energy storage function and the charging function; wherein, the second message data represents message data generated by the battery management unit and sent to the energy management system; the first message data represents message data received by the energy management system from the battery management unit; and the first message data and the second message data are compared to obtain a comparison result; and if the comparison result shows that the first message data and the second message data are the same, it is determined that the communication function between the battery management unit and the energy management system has passed the test.

[0247] In some embodiments of this disclosure, the test machine can also be used to acquire protection commands generated by the energy management system in response to fault messages sent by the battery management unit; acquire fault messages from the battery management unit and determine the fault level of the fault messages; and, if the protection command is determined to be a protection command corresponding to the fault level, determine that the protection function of the energy storage device has passed the test.

[0248] In some embodiments of this disclosure, the energy storage and charging system may further include a liquid cooling module and a fire suppression module; upon receiving a fault message, the energy management system may control all devices or sub-modules in the energy storage and charging system, including the liquid cooling module and the fire suppression module, to perform corresponding protection measures.

[0249] In some embodiments of this disclosure, the testing machine can also be used to acquire first voltage data of the energy storage device under different remaining power levels and second voltage data of the battery in the energy storage device; and, if the first voltage data conforms to a first voltage range and the second voltage data conforms to a second voltage range, determine that the voltage of the energy storage device passes the test.

[0250] In some embodiments of this disclosure, the test machine can also be used to acquire, when the device to be charged is connected to the charging conversion device, the first charging request information of the device to be charged and the second charging request information sent by the device to be charged received by the charging control unit; and to determine, when the first charging request information and the second charging request information are the same, the charging control unit responds to the charging request.

[0251] In some embodiments of this disclosure, the testing machine can also be used to acquire a first charging capability parameter sent by the energy management system to the charging control unit; wherein the first charging capability parameter is calculated by the energy management system based on the received charging capability parameters of the energy storage device and the charging capability parameters of the AC-to-DC converter; and, if the first charging capability parameter is the same as the second charging capability parameter, to determine that the charging capability parameter matching test has been passed; wherein the second charging parameter represents the charging capability parameter calculated based on the measured charging capability parameters of the energy storage device and the measured charging capability parameters of the AC-to-DC converter.

[0252] In some embodiments of this disclosure, the test machine can also be used to acquire the output parameters of the charging conversion device sent by the charging control unit when charging the device to be charged through the charging conversion device; and to determine that the charging conversion device has passed the test of the output parameters when the output parameters are less than or equal to the target parameters; wherein the target parameters are the minimum value between the first charging request information and the first charging capability parameters.

[0253] In some embodiments of this disclosure, the testing machine can also be used to acquire a first discharge parameter of the AC-to-DC converter when charging the device to be charged via the AC-to-DC converter; acquire a second discharge parameter of the energy storage device when charging the device to be charged via the energy storage device; acquire a third discharge parameter of the AC-to-DC converter and a fourth discharge parameter of the energy storage device when charging the device to be charged via both the AC-to-DC converter and the energy storage device; and determine that the AC-to-DC converter and the energy storage device have passed the discharge parameter test when the first discharge parameter and the third discharge parameter are less than or equal to the charging capability parameter of the AC-to-DC converter, and the second discharge parameter and the fourth discharge parameter are less than or equal to the charging capability parameter of the energy storage device.

[0254] In some embodiments of this disclosure, the charging conversion device may include at least two DC-to-DC converters connected in parallel; a tester may also be used to acquire output data of each of the at least two DC-to-DC converters when power is supplied to the device to be charged through the charging conversion device; and to determine output difference information based on the output data; wherein the output difference information characterizes the difference information between the currents output by each of the at least two DC-to-DC converters; and to determine that the charging conversion device has passed the circulating current test when the output difference information is less than or equal to a second threshold.

[0255] In some embodiments of this disclosure, the test machine can also be used to write first software version information to the battery management unit so that the battery management unit sends the first software version information to the energy management system; and to receive second software version information sent by the energy management system; and, if the first software version information and the second software version information are the same, to determine that the energy management system reads the test through the software version.

[0256] In some embodiments of this disclosure, the test machine can also be used to send a high-voltage command to the energy management system; and, if it is determined that the energy management system controls the battery management unit to complete the high-voltage operation of the energy storage device in response to the high-voltage command, determine that the energy storage device has passed the high-voltage test; and to send a low-voltage command to the energy management system; and, if it is determined that the energy management system controls the battery management unit to complete the low-voltage operation of the energy storage device in response to the low-voltage command, determine that the energy storage device has passed the low-voltage test.

[0257] In some embodiments of this disclosure, the test machine can also be used to acquire the status detection information of the battery management unit by the energy management system when the energy storage device is turned off; and to determine that the battery management unit has passed the offline function test when the status detection information indicates that the battery management unit is in an offline state.

[0258] Embodiments of this disclosure provide a testing system, which includes a testing machine and a charging system. The testing machine can be used to acquire first charging data when the remaining power of the energy storage device is less than or equal to a first threshold, and the energy management system controls the AC-to-DC converter to charge the energy storage device, so as to determine whether the energy storage function of the charging system is normal based on the first charging data. The testing machine can also be used to acquire second charging data when the device to be charged is connected to the charging conversion device, and the energy management system controls the AC-to-DC converter and / or the energy storage device to charge the device to be charged, so as to determine whether the charging function of the charging system is normal based on the second charging data. Therefore, when the energy storage function of the energy storage and charging system is normal, the energy management system will instruct the AC-to-DC converter to charge the energy storage device when it detects that the remaining power of the energy storage device is less than or equal to the first threshold. Thus, when testing the energy storage function, the testing machine can acquire the first charging data when the remaining power of the energy storage device is less than or equal to the first threshold, indicating that the energy management system has instructed the AC-to-DC converter to charge the energy storage device. This first charging data can then be used to determine whether the energy storage function of the energy storage and charging system is normal, i.e., whether the energy storage and charging system can automatically charge the energy storage device when the remaining power of the energy storage device is less than or equal to the first threshold. Under normal circumstances, the charging function of the energy storage and charging system supports three charging methods: charging the device using only the AC-to-DC converter, charging the device using only the energy storage device, and charging the device using only the energy storage device. Simultaneously, the AC-to-DC converter and energy storage device are used to charge the device to be charged. Therefore, when testing the charging function of the energy storage and charging system, the tester can acquire second charging data when the device to be charged is connected, based on which the energy management system controls the AC-to-DC converter and / or energy storage device to charge the device. This second charging data allows the tester to determine whether the energy storage and charging system can normally execute the three charging methods. This enables effective testing of the automatic energy storage and charging functions of the energy storage and charging system. Furthermore, before testing the energy storage and charging functions, the communication function between the battery management unit and the energy management system can be tested based on the message data received by the energy management system and the message data sent by the battery management unit, ensuring that the communication function between the battery management unit and the energy management system is normal. Based on the above tests, the reliability of the energy storage and charging system can be effectively improved.

[0259] Based on the above embodiments, in another embodiment of this disclosure, exemplarily as shown in FIG4, the energy storage and charging system in the test system may include an energy management system 21, an energy storage device 22, a charging conversion device 23, and an AC-to-DC converter 24; wherein, the AC-to-DC converter 24 may be a bidirectional AC / DC converter, the charging conversion device 23 may be a bidirectional DC / DC converter, the energy storage device 22 may be controlled by a BMS, and the charging conversion device 23 may be controlled by a CCU; the energy storage and charging system may also include a wireless communication device 25 for communication between various devices or sub-modules in the energy storage and charging system; the energy storage and charging system may also include a charging gun 26; the test system may also include a DC bus 31; the energy storage device 22 and the charging conversion device 23 may be connected to the DC bus 31; the charging gun 26 may be connected to the charging conversion device 23; the test system may also include a transformer 32, and the AC-to-DC converter 24 is connected to the power grid 33 through the transformer 32 to obtain the electrical energy output by the power grid 33; the energy storage and charging system may charge the device to be charged, such as an electric vehicle 34, connected to the charging gun.

[0260] In the embodiments of this disclosure, when the tester tests the storage and charging system, it can fully test the functions, status, and communication of each module, then verify the coordination and cooperation between the modules, and finally test the entire storage and charging system.

[0261] In some embodiments of this disclosure, the energy storage device in the energy storage and charging system is equipped with a high-power battery, which can achieve low power input, such as drawing power from the grid at a power of 40kW to 50kW, and high power output, such as charging electric vehicles at a power of 480kW or even greater than 480kW; therefore, the communication, function, protection, and power performance of the battery need to be tested in detail.

[0262] For example, the testing items for the energy storage and charging system may include hardware testing items, software testing items, and overall system testing items; wherein, hardware testing items may include appearance inspection, basic function testing, protocol conformance and interoperability testing, safety testing, protection function testing, accuracy performance testing, environmental adaptability testing, and electromagnetic compatibility testing; software testing items may include interactive screen function testing, control module communication testing, micro-motor system protection function testing, pile body debugging software function testing, basic peripheral function testing, overall pile function testing, cloud platform function testing, software function testing, and fault code testing.

[0263] For example, visual inspection can examine the appearance, markings, nameplates, and product specifications of each device. Basic functional testing can include verifying the communication functions between submodules in the energy storage and charging system, basic charging functions including insulation detection, vehicle plug locking, charging control, energy storage and charging system interaction, and charging metering. Protocol conformance and interoperability testing can include testing charging coordination control, communication status, charging voltage range, protective grounding verification, energy storage device protection functions, energy storage device voltage, and output parameter matching. Charging coordination control testing can include charging status, connection sequence, and connection confirmation; communication status testing can include verification of successful communication, communication failure, and communication interruption; protective grounding verification can include verification of the energy storage device's protective grounding; and output parameter matching testing can include testing the charging control unit's charging request response, charging capacity parameter matching, and the output parameters of the charging conversion device. Safety testing can include insulation withstand voltage testing, dielectric strength testing, impulse withstand voltage testing, and grounding resistance compliance testing. Protection function testing may include verification of the charging system's recharge protection measures, discharge protection measures, door opening protection, emergency stop function, and battery polarity. Accuracy performance testing may include output parameter accuracy testing, start-stop control accuracy testing, instantaneous peak voltage and current verification at startup, standby power consumption verification, and circulating current testing. Output parameter accuracy testing may include setting and measuring the error of output current or voltage; start-stop control accuracy testing may include verifying the current adjustment time during startup and the output current stop time during shutdown. Environmental adaptability testing may include high-temperature testing, low-temperature testing, alternating damp heat testing, extreme temperature rise detection, enclosure protection rating testing, noise detection, salt spray resistance testing, and high-temperature and high-humidity operation testing. High-temperature testing may include verification of start-stop control and operation under various working modes, such as operation at 45°C; low-temperature testing may include verification of start-stop control and operation under various working modes, such as operation at -20°C; enclosure protection rating testing may include rain testing, etc. Electromagnetic compatibility (EMC) testing can include radiated emission testing, conducted emission testing, electrostatic discharge testing, radio frequency electromagnetic field radiated immunity testing, electrical fast transient / burst immunity testing, surge immunity testing, conducted disturbance immunity testing, and immunity testing for voltage dips, short interruptions, and voltage variations.

[0264] For example, interactive screen function testing may include basic function testing, basic information testing, and other function testing. Basic function testing may include testing display, operation, and content integrity; basic information testing may include testing basic charging information, historical orders, device information, fault information, rate information, and interactive QR codes; other function testing may include testing display network configuration and vehicle identification code configuration. Control module communication testing may include communication testing between the energy storage and charging system submodules and the control module, and testing the accuracy of control module information. The control module may include EMS, BMS, and CCU. Micro-motor system protection function testing may include overvoltage protection testing, undervoltage protection testing, AC / DC converter fault protection testing, SOC lower limit protection testing, water immersion protection testing, overcurrent protection testing, overtemperature protection testing, access control protection testing, emergency stop function testing, relay adhesion diagnosis and control testing, and energy storage device fault protection testing. The functions of the pile body debugging software can include: testing the connection function between the debugging software and the pile body; software version reading test; automatic and manual mode switching test; main contactor control and feedback test; auxiliary power relay control test; power control output test; automatic charging test; charging end test; meter data reading function test; high-precision module data reading test; gun status and gun return status test; gun electronic lock unlocking and feedback test; gun temperature reading test; gun connection voltage reading test; pile body configuration parameter reading and writing test; charging module setting and output information test; insulation function start and control test test; insulation test information reading test; liquid cooling module target temperature setting test; liquid cooling module mode setting test; liquid cooling gun opening test; liquid cooling gun closing test; liquid cooling cell module fault injection test; liquid cooling gun module data fault injection test; fire protection module data information test; fire protection module fault injection test test; pile body fault information monitoring test; control module over-the-air download technology function test; software version reading test; high voltage test; low voltage test; and offline function test. Basic peripheral function tests may include battery communication tests, verification of signal changes when connected to the test gun in a real vehicle, verification of electronic lock locking and unlocking in a real vehicle, AC / DC converter power-on / off tests, AC / DC converter real-time data acquisition tests, AC / DC converter fault reporting tests, battery data acquisition tests, and battery fault reporting tests. Complete charging pile function tests may include real vehicle charging function tests, current limiting function tests, pulse current time tests, mini-program-initiated charging tests, mini-program-stopped charging tests, mini-program charging information verification, emergency stop charging function tests during charging, and access control-triggered charging stop function tests during charging.Cloud platform functional testing may include charging pile login authentication testing, login authentication response testing, charging pile heartbeat packet testing, billing model verification request testing, billing model verification request response testing, offline monitoring data testing, charging process BMS demand and output testing, remote start command response testing, operation platform remote control start testing, remote stop command response testing, operation platform remote stop testing, transaction record testing, transaction record confirmation testing, time synchronization setting response testing, time synchronization setting testing, billing model response testing, billing model setting testing, and remote upgrade program testing. Software functional testing may include QR code charging testing, demand current / actual current consistency testing, demand voltage / actual voltage consistency testing, order amount and duration rule testing, software display device status consistency testing with actual pile measurements, account recharge and usage testing, SOC display matching data testing, software remote stop testing, and charging record display consistency testing.

[0265] For example, the whole machine test may include energy storage function test, charging function test and aging test; wherein, the aging test may set up multiple sets of operation experiments of the energy storage and charging system under different SOC to verify whether the energy storage and charging system can automatically adjust the charging control strategy according to the requested power information in the vehicle's charging request under different battery SOC; it may also conduct experiments by running the energy storage and charging system for a long period of time, such as running continuously for 3 to 7 days, to verify whether the energy storage and charging system can still automatically adjust the charging control strategy.

[0266] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure.

Claims

1. A testing method for a battery storage and charging system, applied to a testing machine; the battery storage and charging system includes an energy management system, an energy storage device, and a charging conversion device; the energy storage device includes a battery management unit; the method includes: When the remaining power of the energy storage device is less than or equal to a first threshold, the first charging data is obtained, instructing the energy management system to charge the energy storage device by the AC-to-DC converter, and the energy storage function of the energy storage system is determined to be normal based on the first charging data. When the device to be charged is connected to the charging conversion device, second charging data is acquired, which is used by the energy management system to control the AC-to-DC converter and / or the energy storage device to charge the device. Based on the second charging data, it is determined whether the charging function of the energy storage and charging system is normal. The charging conversion device is connected to the AC-to-DC converter and the energy storage device. The energy storage function and the charging function are executed after the communication function between the battery management unit and the energy management system passes the test. The test of the communication function is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

2. The testing method for the storage and charging system according to claim 1, wherein, The second charging data includes third charging information, fourth charging information, and fifth charging information; the method further includes: A first charging instruction message is sent to the energy management system, so that the energy management system responds to the first charging instruction message, controls the AC-to-DC converter to charge the device to be charged, and acquires the third charging information; wherein, the first charging instruction message is used to instruct the device to be charged to be charged through the AC-to-DC converter; A second charging instruction message is sent to the energy management system, so that the energy management system responds to the second charging instruction message, controls the energy storage device to charge the device to be charged through the battery management unit, and obtains the fourth charging information; wherein, the second charging instruction message is used to instruct the energy storage device to charge the device to be charged; A third charging instruction message is sent to the energy management system, so that the energy management system responds to the third charging instruction message, controls the AC-to-DC converter and the battery management unit to charge the device to be charged through the AC-to-DC converter and the energy storage device, and obtains the fifth charging information.

3. The test method for the storage and charging system according to claim 1 or 2, wherein, The method further includes: Before testing the energy storage function and the charging function, first message data of the energy management system and second message data of the battery management unit are acquired; wherein, the second message data represents message data generated by the battery management unit and sent to the energy management system; and the first message data represents message data received by the energy management system from the battery management unit. The first message data and the second message data are compared to obtain the comparison result; If the comparison result shows that the first message data and the second message data are the same, it is determined that the communication function between the battery management unit and the energy management system has passed the test.

4. The test method for the storage and charging system according to claim 3, wherein, After determining that the communication function between the battery management unit and the energy management system has passed the test when the comparison result shows that the first message data and the second message data are the same, the method further includes: The energy management system receives the protection command generated in response to the fault message sent by the battery management unit. Obtain the fault message from the battery management unit and determine the fault level of the fault message; If the protection command is determined to be a protection command corresponding to the fault level, the protection function of the energy storage device is determined to have passed the test.

5. The test method for the storage and charging system according to claim 3 or 4, wherein, After determining that the communication function between the battery management unit and the energy management system has passed the test when the comparison result shows that the first message data and the second message data are the same, the method further includes: Acquire first voltage data of the energy storage device under different remaining power conditions and second voltage data of the battery in the energy storage device; If the first voltage data conforms to the first voltage range and the second voltage data conforms to the second voltage range, the voltage of the energy storage device is determined to have passed the test.

6. The test method for the storage and charging system according to any one of claims 1 to 5, wherein, The charging conversion device includes a charging control unit; the method further includes: When the device to be charged is connected to the charging conversion device, the first charging request information of the device to be charged and the second charging request information sent by the device to be charged are received by the charging control unit. If the first charging request information is the same as the second charging request information, it is determined that the charging control unit has passed the charging request response test.

7. The test method for the storage and charging system according to claim 6, wherein, After determining that the charging control unit has passed the charging request response test when the first charging request information and the second charging request information are the same, the method further includes: The charging control unit receives a first charging capability parameter sent by the energy management system; wherein the first charging capability parameter is calculated by the energy management system based on the received charging capability parameters of the energy storage device and the charging capability parameters of the AC-to-DC converter. If the first charging capability parameter and the second charging capability parameter are the same, the charging capability parameter matching test is passed; wherein, the second charging parameter represents the charging capability parameter calculated based on the measured charging capability parameter of the energy storage device and the measured charging capability parameter of the AC to DC converter.

8. The test method for the storage and charging system according to claim 7, wherein, After determining that the charging capability parameter matching test has been passed when the first charging capability parameter and the second charging capability parameter are the same, the method further includes: When charging the device to be charged through the charging conversion device, the output parameters of the charging conversion device sent by the charging control unit are obtained; If the output parameter is less than or equal to the target parameter, the charging conversion device is determined to have passed the output parameter test; wherein the target parameter is the minimum value between the first charging request information and the first charging capability parameter.

9. The test method for the storage and charging system according to claim 8, wherein, After determining that the charging conversion device has passed the output parameter test when the output parameter is less than or equal to the target parameter, the method further includes: When the device to be charged is charged through the AC-to-DC converter, the first discharge parameter of the AC-to-DC converter is obtained; When the device to be charged is charged through the energy storage device, the second discharge parameters of the energy storage device are obtained; When the device to be charged is charged through the AC-to-DC converter and the energy storage device, the third discharge parameter of the AC-to-DC converter and the fourth discharge parameter of the energy storage device are obtained. If the first discharge parameter and the third discharge parameter are less than or equal to the charging capability parameter of the AC-to-DC converter, and the second discharge parameter and the fourth discharge parameter are less than or equal to the charging capability parameter of the energy storage device, then the AC-to-DC converter and the energy storage device are determined to have passed the discharge parameter test.

10. The test method for the storage and charging system according to any one of claims 1 to 9, wherein, The charging conversion device includes at least two DC-DC converters connected in parallel; the method further includes: When power is supplied to the device to be charged through the charging conversion device, the output data of each of the at least two DC to DC converters are acquired; Output difference information is determined based on the output data; wherein, the output difference information represents the difference between the currents output by each of the at least two DC-to-DC converters; If the output difference information is less than or equal to the second threshold, the charging conversion device is determined to have passed the circulating current test.

11. The test method according to any one of claims 1 to 10, wherein, The method further includes: Write first software version information to the battery management unit so that the battery management unit sends the first software version information to the energy management system; Receive the second software version information sent by the energy management system; If the first software version information and the second software version information are the same, it is determined that the energy management system has passed the test of reading the software version.

12. The test method according to any one of claims 1 to 11, wherein, The method further includes: Send a high-voltage command to the energy management system; If it is determined that the energy management system controls the battery management unit to complete the high-voltage operation of the energy storage device in response to the high-voltage command, it is determined that the energy storage device passes the high-voltage test; Send a high-voltage command to the energy management system; If it is determined that the energy management system controls the battery management unit to complete the high-voltage operation of the energy storage device in response to the high-voltage command, then the energy storage device is determined to have passed the high-voltage test.

13. The test method according to any one of claims 1 to 12, wherein, The method further includes: With the energy storage device turned off, the energy management system acquires the status detection information of the battery management unit. If the status detection information indicates that the battery management unit is in an offline state, it is determined that the battery management unit has passed the offline function test.

14. A testing system, the testing system comprising a testing machine and a storage and charging system connected to the testing machine; wherein, The energy storage and charging system includes an energy management system, an energy storage device, and a charging conversion device; the energy storage device includes a battery management unit; the charging conversion device is connected to both an AC-to-DC converter and the energy storage device. The testing machine is used to acquire first charging data when the remaining power of the energy storage device is less than or equal to a first threshold, and the energy management system controls the AC to DC converter to charge the energy storage device, so as to determine whether the energy storage function of the energy storage system is normal based on the first charging data. The testing machine is further configured to acquire second charging data when the device to be charged is connected to the charging conversion device, wherein the energy management system controls the AC-to-DC converter and / or the energy storage device to charge the device to be charged, so as to determine whether the charging function of the energy storage and charging system is normal based on the second charging data; wherein the energy storage function and the charging function are executed under the condition that the communication function between the battery management unit and the energy management system passes the test; the test of the communication function is completed based on the message data received by the energy management system and the message data sent by the battery management unit.

15. The testing system according to claim 14, wherein, The energy storage device includes a battery management unit; the charging conversion device includes a charging control unit. The battery management unit is used to control the energy storage device to charge the device to be charged; The charging control unit is used to control the charging conversion device to output charging current to the device to be charged.

16. The test system according to claim 14 or 15, wherein, The energy storage and charging system also includes a charging gun; the charging gun is connected to the charging conversion device. The AC-to-DC converter, the energy storage device, and the charging conversion device are connected to the DC bus.

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