Parallel test system for multiple batteries

Abstract

The utility model provides a multi-battery parallel test system, which belongs to the technical field of electrical test and comprises at least two sampling units, a wire harness tool unit and a test unit. Wherein the at least two sampling units are connected in parallel to the test unit through the wire harness tool unit, the at least two sampling units are used for sampling at least two batteries to obtain sampling signals, and the sampling signals corresponding to the at least two batteries are transmitted to the test unit through the wire harness tool unit. The test unit is used for testing based on the sampling signals corresponding to the at least two batteries. According to the system, the wire harness tool unit is arranged, the effect that multiple batteries are connected to the testing unit in parallel for parallel testing is achieved, the testing period is effectively shortened, the testing cost is reduced, and the testing efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of electrical testing technology, and in particular, relates to a parallel testing system for multiple batteries. Background Art

[0002] Electrical testing refers to simulating the operating conditions of the entire vehicle according to standard requirements to verify whether the various functions of the test sample (such as the tested component) meet the design expectations in the electrical environment of the entire vehicle.

[0003] At present, when conducting electrical tests, in order to eliminate possible deviations in the tests and detect the consistency between products, the requirements for the number of test samples in various corporate standards are not completely unified. Usually, the number of test samples required in the standards is usually large, and the number of test items corresponding to each test sample in the corresponding standards is also large. This leads to a long test cycle for the test samples, which occupies too long a period of time for the human resources and equipment of electrical testing, high test costs, and low test efficiency. Utility Model Content

[0004] In view of the above technical problems, an embodiment of the present application provides a multi-battery parallel testing system, which can achieve the effect of a set of test units testing multiple batteries in parallel, and the results of parallel testing of multiple batteries are consistent with those of a single battery, effectively shortening the test cycle, reducing test costs, and improving test efficiency.

[0005] The embodiment of the present application provides a parallel testing system for multiple batteries, the system comprising:

[0006] At least two sampling units, harness fixture unit and test unit;

[0007] Among them, the at least two sampling units are connected to the test unit in parallel through the wiring harness tooling unit, and the at least two sampling units are used to sample the at least two batteries to be tested to obtain sampling signals, and transmit the sampling signals corresponding to the at least two batteries to the test unit through the wiring harness tooling unit, and the test unit is used to perform testing based on the sampling signals corresponding to the at least two batteries.

[0008] In the technical solution of the embodiment of the present application, compared with the related art that directly connects a single battery to the same test unit in sequence for testing, there are problems such as long test cycle, high cost and low efficiency. The system of the present application achieves the effect of connecting multiple batteries in parallel to the test unit for parallel testing by setting a harness fixture unit. The specific system includes at least two sampling units, a harness fixture unit and a test unit. At least two sampling units are connected to the test unit in parallel through the harness fixture unit, wherein at least two sampling units are used to sample signals of at least two batteries to be tested, and multiple sampling units transmit the sampling signals corresponding to multiple batteries to a set of test units through the harness fixture unit. The test unit can perform parallel testing on multiple batteries based on these sampling signals. The effect of a set of test units corresponding to multiple batteries for parallel testing is achieved, and the results of multiple batteries tested in parallel are consistent with the results of a single battery tested. On the basis of ensuring the test effect, the test cycle is effectively shortened, the test cost is reduced, and the test efficiency is improved.

[0009] In some embodiments, the at least two sampling units include at least two master sampling units and at least two slave sampling units, and the at least two batteries include at least two master batteries and at least two slave batteries;

[0010] Among them, each of the main sampling units is used to be connected to each of the main batteries, and is used to sample each of the main batteries to obtain a first sampling signal. Each of the slave sampling units is used to be connected to each of the slave batteries, and is used to sample each of the slave batteries to obtain a second sampling signal. Each of the slave sampling units is also connected to each of the main sampling units, and is used to transmit the second sampling signal to each of the main sampling units. The at least two main sampling units are connected to the test unit in parallel through the wiring harness tooling unit, and the test unit is used to test the at least two batteries according to the first sampling signal corresponding to each of the main batteries and the second sampling signal corresponding to each of the slave batteries.

[0011] In an embodiment of the present application, a specific implementation of multiple sampling units is provided. The multiple sampling units are divided into a main sampling unit and a slave sampling unit, which are respectively used to sample the main battery and the slave battery included in the battery to obtain a first sampling signal and a second sampling signal. For a set of main batteries and slave batteries, the corresponding main sampling unit transmits the first sampling signal and the second sampling signal to the test unit through the harness tooling unit, so that the test unit tests the set of main batteries and slave batteries according to the first sampling signal and the second sampling signal.

[0012] In some embodiments, a connector is further provided on one side of each of the main sampling units, and each of the main sampling units leads out N first connecting lines for transmitting different signals through the connector. The wiring harness fixture unit is used to connect in parallel the first connecting lines for transmitting the same signal on the main sampling units corresponding to different batteries in the at least two batteries to lead out a bus, so as to obtain N second connecting lines led out by the wiring harness fixture unit. The wiring harness fixture unit is connected to the test unit through the N second connecting lines, and N is an integer greater than 0.

[0013] In an embodiment of the present application, a specific implementation method of connecting multiple sampling units and batteries and test units in parallel using a harness fixture unit is provided. Specifically, each main sampling unit corresponding to each main battery leads out N first connection lines through a connector set on one side thereof, and these N first connection lines are used to transmit different signals, such as signals related to the transmission message, power supply signals, alarm signals, etc. The harness fixture unit is used to connect the first connection lines used to transmit the same signal on the main sampling units corresponding to different batteries in parallel, and then lead out a bus as a second connection line to connect to the test unit. For example, after connecting the first connection lines used to transmit message-related signals on multiple main sampling units in parallel, a second connection line is led out and connected to the test unit. In this way, the number of second connection lines led out is consistent with the number of first connection lines on a single main sampling unit, so as to be equivalent to the number of test interfaces of multiple batteries and single battery test interfaces, thereby ensuring that the parallel test results of multiple batteries are equivalent to the test results of single batteries, and achieving the effect of simultaneous testing of multiple batteries and shortening the test cycle.

[0014] In some embodiments, the test unit includes an oscilloscope, the N second connection lines include current serial communication protocol lines, and the current serial communication protocol lines are connected to the oscilloscope;

[0015] The oscilloscope is used to: display the waveform of the first target signal transmitted through the current serial communication protocol line in a preset visual interface;

[0016] The first target signal includes at least one of the first sampling signal and the second sampling signal, and the waveform displayed by the oscilloscope is used to determine whether there is a fault in the at least two batteries.

[0017] In an embodiment of the present application, the test unit includes an oscilloscope, and the N second connecting lines include current serial communication protocol lines. The main sampling unit can be connected to the oscilloscope through the current serial communication protocol line, and send a first target signal to the oscilloscope, that is, send at least one of the first sampling signal and the second sampling signal, so that the waveform of the first target signal can be displayed in a pre-set visual interface through the oscilloscope, and the displayed waveform can be used to determine whether there is a fault in the corresponding at least two batteries, thereby realizing parallel detection of multiple batteries.

[0018] In some embodiments, the test unit further includes a host computer, and the current serial communication protocol line is also connected to the host computer;

[0019] The host computer is used to: transmit serial communication protocol CAN messages to the at least two batteries through the current serial communication protocol line;

[0020] The CAN message includes at least one of the first sampling signal and the second sampling signal, and the CAN message is used in conjunction with the waveform of the oscilloscope to determine whether there is a fault in the at least two batteries, or to determine which battery has a fault among the at least two batteries.

[0021] In an embodiment of the present application, the test unit also includes a host computer, and the main sampling unit can be connected to the host computer through a current serial communication protocol line to send at least one of the first sampling signal and the second sampling signal to the host computer in the form of a CAN message. The CAN message is used to cooperate with the waveform of the oscilloscope to determine whether there is a fault in at least two batteries, or to locate the specific battery where the fault occurs. That is, the test unit can specifically cooperate with the set host computer and oscilloscope to achieve parallel testing of multiple batteries.

[0022] In some embodiments, the test unit further includes a vector signal transceiver, and the current serial communication protocol line is connected to the host computer via the vector signal transceiver;

[0023] The host computer is specifically used to transmit the CAN message between the at least two batteries via the vector signal transceiver and the current serial communication protocol line.

[0024] In an embodiment of the present application, the test unit also includes a vector signal transceiver, and the host computer is specifically connected to the current serial communication protocol line through the vector signal transceiver, that is, the host computer transmits CAN messages between the main sampling units corresponding to the multiple batteries through the vector signal transceiver, so as to perform parallel testing on multiple batteries through the CAN message and the waveform of the oscilloscope.

[0025] In some embodiments, the host computer is also used to:

[0026] When it is determined through the waveform displayed by the oscilloscope that there is a fault in the at least two batteries, obtaining sub-messages corresponding to the at least two batteries respectively according to the received CAN message;

[0027] At least one faulty battery is determined from the at least two batteries according to the sub-messages respectively corresponding to the at least two batteries.

[0028] In an embodiment of the present application, during a specific test, it is possible to first determine qualitatively whether a fault occurs in a plurality of batteries through the waveform displayed on the oscilloscope. For example, if the waveform is abnormal, it can be determined that a fault occurs in the plurality of batteries. At this time, the sub-messages corresponding to each battery are obtained based on the total CAN message received, and then the specific battery with the fault is located from the plurality of batteries based on the sub-message. The present application first qualitatively determines whether there is a fault in a plurality of batteries. If it is determined that there is no fault, no further analysis is required. If it is determined that there is a fault, the sub-messages corresponding to each battery are used to locate the specific battery with the fault. This can effectively reduce the computational complexity of the fault test on the basis of supporting the fault test.

[0029] In some embodiments, the sub-message includes message data and a CAN identifier, at least two of the CAN identifiers correspond one-to-one to the at least two batteries, and the message data is related to at least one of the first sampling signal and the second sampling signal;

[0030] The host computer is also specifically used for:

[0031] Determining at least one abnormal sub-message according to the message data in the sub-messages corresponding to the at least two batteries respectively;

[0032] At least one faulty battery corresponding to the at least one abnormal sub-message is determined according to the CAN identifier in the at least one abnormal sub-message.

[0033] In an embodiment of the present application, a specific implementation method for locating a faulty battery using a host computer is provided. First, based on the message data in the sub-message, it is determined which sub-message or sub-messages are abnormal, and then the CAN identifier in the abnormal sub-message is used to correspond to at least one battery to confirm that it is a faulty battery. On the basis of supporting fault testing, the calculation amount of fault testing is effectively reduced. The present application encodes multiple batteries, each battery corresponds to a unique CAN identifier, and the transmitted CAN message will carry the CAN identifier corresponding to the battery to be tested for distinction, so as to facilitate the subsequent specific positioning of the faulty battery.

[0034] In some embodiments, the sub-message also includes a message timestamp;

[0035] The host computer is further used to determine the fault occurrence time corresponding to the at least one faulty battery according to the message timestamp in the at least one abnormal sub-message.

[0036] In the embodiment of the present application, the host computer can also determine the specific time when the faulty battery corresponds to the fault according to the message timestamp in the abnormal sub-message as the fault occurrence time, which is convenient for testers to perform fault testing and subsequent analysis.

[0037] In some embodiments, the host computer is further used to: select a second target signal to be tested from at least one of the first sampling signal and the second sampling signal as the message data through a signal filter set in the host computer.

[0038] In an embodiment of the present application, a signal filter is also provided in the host computer, which can select the second target signal to be tested from the received sampling signal as the message data, and perform independent monitoring and analysis without monitoring and analyzing all signals, thereby making the testing process more convenient.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 This is one of the structural schematic diagrams of a multi-battery parallel testing system proposed in an embodiment of the present application;

[0042] Figure 2 This is the second structural schematic diagram of a multi-battery parallel testing system proposed in an embodiment of the present application;

[0043] Figure 3 This is the third structural diagram of a multi-battery parallel testing system proposed in an embodiment of the present application;

[0044] Figure 4 It is a test waveform diagram of superimposed alternating current in a multi-battery parallel test system proposed in an embodiment of the present application;

[0045] Figure 5It is a schematic diagram of the test waveform of the single battery test system regarding superimposed alternating current in the related art;

[0046] Figure 6 It is a test waveform diagram of a multi-battery parallel test system regarding pin interruption proposed in an embodiment of the present application;

[0047] Figure 7 It is a test waveform diagram of a single battery test system regarding pin interruption in the related art. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two), and similarly, "plurality of sets" refers to more than two sets (including two).

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] At present, when conducting electrical tests, in order to eliminate possible deviations in the test and to ensure the consistency of the test products, the requirements for the number of test samples in the standards of various companies are not completely unified. For example, the standards of some companies clearly require that the number of test samples must not be less than 6, and there are also many test items in the corresponding standards, which leads to a long test cycle for the samples.

[0056] In the related art, the electrical testing system is usually designed only for a single sample, without considering whether multiple samples to be tested can be connected and tested simultaneously. For example, the test cycle for each set of samples is 100 hours, and the test cycle for 6 sets of samples requires a total of 600 hours. This takes up too much human resources and equipment for electrical testing, resulting in high testing costs and low testing efficiency.

[0057] In response to the above-mentioned problems, the present application provides a multi-battery parallel testing system based on the communication principles of automotive electronic components and simulating the electrical layout of the entire vehicle. The system can support simultaneous testing of multiple sets of samples (e.g., multiple batteries). The parallel test results of multiple batteries obtained by testing are equivalent to the test results of a single battery. Therefore, the same human resources and equipment resources can be used for testing, and the test cycle of multiple batteries can be compressed into the test cycle of one battery, effectively shortening the test cycle, reducing testing costs, and improving testing efficiency.

[0058] The multi-battery parallel testing system provided in the embodiment of the present application can be applied to the testing of batteries or related energy storage systems in electric vehicles and other scenarios. When the battery is used as the power source in the power-consuming device, the power-consuming device can be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0059] The battery mentioned in this application may refer to a battery cell, a module, a battery pack, etc., and this application does not impose any restrictions on this.

[0060] The multi-battery parallel testing system provided in the embodiments of the present application is described in detail below.

[0061] Figure 1 This is one of the structural diagrams of a multi-battery parallel testing system proposed in the embodiment of the present application, such as Figure 1 As shown, the multi-battery parallel testing system 100 includes: at least two sampling units 101 , a harness tooling unit 102 and a testing unit 103 .

[0062] The specific connection relationship is as follows: the at least two sampling units 101 are connected in parallel to the testing unit 103 through the wiring harness tooling unit 102;

[0063] Among them, the at least two sampling units 101 are used to sample the at least two batteries 200 to be tested to obtain sampling signals, and transmit the sampling signals corresponding to the at least two batteries 200 to the testing unit 103 through the wiring harness tooling unit 102, and the testing unit 103 is used to perform tests based on the sampling signals corresponding to the at least two batteries 200.

[0064] It should be noted that Figure 1 In the figure, it is taken as an example that each sampling unit 101 is connected to the wiring harness tooling unit 102 through a wire, and the wiring harness tooling unit 102 is further connected to the test unit 103 through a wire. Here, according to actual conditions, multiple connecting wires can be set between each sampling unit 101 and the wiring harness tooling unit 102. Similarly, multiple connecting wires can also be set between the wiring harness tooling unit 102 and the test unit 103. This application does not impose any restrictions on this.

[0065] In the embodiment of the present application, compared with the related art that directly connects a single battery to the same test unit in sequence for testing, there are problems such as long test cycle, high cost and low efficiency. The system of the present application achieves the effect of connecting multiple batteries in parallel to the test unit for parallel testing by setting a harness fixture unit. The specific system includes at least two sampling units, a harness fixture unit and a test unit. At least two sampling units are connected to the test unit in parallel through the harness fixture unit, wherein at least two sampling units are used to sample signals of at least two batteries to be tested. The multiple sampling units transmit the sampling signals corresponding to the multiple batteries to a set of test units through the harness fixture unit, and the test unit can perform parallel testing on the multiple batteries based on these sampling signals. The effect of a set of test units corresponding to multiple batteries for parallel testing is achieved, and the results of the parallel testing of multiple batteries are consistent with the results of the single battery test. On the basis of ensuring the test effect, the test cycle is effectively shortened, the test cost is reduced, and the test efficiency is improved.

[0066] According to some embodiments of the present application, optionally, Figure 2 This is a second structural diagram of a multi-battery parallel testing system proposed in an embodiment of the present application, such as Figure 2 As shown, the at least two sampling units 101 include at least two master sampling units 1011 and at least two slave sampling units 1012, and the at least two batteries 200 include at least two master batteries 201 and at least two slave batteries 202;

[0067] Among them, each of the main sampling units 1011 is used to be connected to each of the main batteries 201, and is used to sample each of the main batteries 201 to obtain a first sampling signal. Each of the slave sampling units 1012 is used to be connected to each of the slave batteries 202, and is used to sample each of the slave batteries 202 to obtain a second sampling signal. Each of the slave sampling units 1012 is also connected to each of the main sampling units 1011, and is used to transmit the second sampling signal to each of the main sampling units 1011. The at least two main sampling units 1011 are connected to the test unit 103 in parallel through the wiring harness tooling unit 102. The test unit 103 is used to test the at least two batteries 200 according to the first sampling signal corresponding to each of the main batteries 201 and the second sampling signal corresponding to each of the slave batteries 202.

[0068] Specifically, Figure 2 As shown, the main sampling unit 1011, the slave sampling unit 1012, the master battery 201 and the slave battery 202 can be used as a set of modules to be tested. In the module to be tested, the main sampling unit 1011 samples the master battery 201, and the slave sampling unit 1012 samples the slave battery 202. The slave sampling unit 1012 then aggregates the second sampling signal obtained by sampling to the main sampling unit 1011, so that the main sampling unit 1011 can communicate with the harness tooling unit 102 and the test unit 103 outside the module to be tested.

[0069] The main sampling units 1011 in different modules to be tested are connected in parallel to the test unit 103 through the harness tooling unit 102, so as to transmit the first sampling signal and the second sampling signal summarized by the main sampling unit 1011 to the test unit 103 for testing. Specifically, the test unit 103 can test the batteries in different modules to be tested according to the first sampling signal corresponding to each main battery 201 and the second sampling signal corresponding to each slave battery 202; through the parallel connection, multiple modules to be tested can be tested normally under a set of test units 103, thereby effectively shortening the test cycle.

[0070] It should be noted that the main battery 201 and the slave battery 202 are, for example, battery modules, specifically, ternary lithium battery modules. The first end of the main battery 201 can be connected to the first end of the slave battery 202, the second end of the main battery 201 serves as the positive electrode of the above-mentioned module to be tested, and the second end of the slave battery 202 serves as the negative electrode of the above-mentioned module to be tested.

[0071] In some embodiments, the master sampling unit 1011 and the slave sampling unit 1012 may be, for example, current sampling units (CSCs) for respectively collecting currents flowing through the master battery 201 and the slave battery 202 as sampling signals.

[0072] In other embodiments, the master sampling unit 1011 is connected to the master battery 201 via a data sampling line (e.g., a twisted pair), the slave sampling unit 1012 is connected to the slave battery 202 via a data sampling line (e.g., a twisted pair), the master sampling unit 1011 and the slave sampling unit 1012 are connected via a low-voltage line, and the master battery 201 and the slave battery 202 are connected via a low-voltage line.

[0073] For example, Figure 3 This is a third structural diagram of a multi-battery parallel testing system proposed in an embodiment of the present application, such as Figure 3 As shown, the example of testing three sets of modules to be tested, with both the master and slave sampling units using CSC, is used for explanation.

[0074] First, the three sets of modules to be tested are respectively Figure 3 Multiple sets of modules to be tested can be connected according to the layout diagram, and multiple sets of modules to be tested can be placed on insulating pads to ensure the safety of testers during the test.

[0075] The two CSCs are used as the master CSC and the slave CSC, respectively. The master CSC and the slave CSC are connected to the master battery and the slave battery respectively through data sampling lines (such as twisted pair cables), and then the master CSC and the slave CSC are connected with a low-voltage line, and the master battery and the slave battery are also connected with a low-voltage line. After the connection, after the slave CSC collects the sampling signal of the slave battery, it needs to be aggregated to the master CSC first, and the master CSC transmits the sampling signal of the master battery and the aggregated sampling signal of the slave battery to the test unit through the harness tooling unit for testing;

[0076] The actual tested samples may be only three master batteries, and the three slave batteries may be, for example, matching components of the master battery.

[0077] It should be noted that the wiring harnesses of the three sets of modules to be tested are connected in parallel in the wiring harness tooling unit. Therefore, when the bus is connected to a group of test units, communication and testing with the three sets of modules to be tested in the group can be completed simultaneously, thereby shortening the test cycle and saving equipment resources.

[0078] In an embodiment of the present application, a specific implementation of multiple sampling units is provided. The multiple sampling units are divided into a main sampling unit and a slave sampling unit, which are respectively used to sample the main battery and the slave battery included in the battery to obtain a first sampling signal and a second sampling signal. For a set of main batteries and slave batteries, the corresponding main sampling unit transmits the first sampling signal and the second sampling signal to the test unit through the harness tooling unit, so that the test unit tests the set of main batteries and slave batteries according to the first sampling signal and the second sampling signal.

[0079] According to some embodiments of the present application, optionally, Figure 2 As shown, a connector 1013 is further provided on one side of each of the main sampling units 1011, and each of the main sampling units 1011 leads out N first connection lines for transmitting different signals through the connector 1013. The harness fixture unit 102 is used to connect in parallel the first connection lines for transmitting the same signal on the main sampling units 1011 corresponding to different batteries in the at least two batteries 200, and then lead out a bus to obtain N second connection lines led out by the harness fixture unit 102. The harness fixture unit 102 is connected to the test unit 103 through the N second connection lines, where N is an integer greater than 0.

[0080] Specifically, the main sampling unit 1011 summarizes the first sampling signal collected by the main sampling unit 1011 and the second sampling signal collected by the sampling unit 1012. A first connecting line can be led out through a connector 1013 set on one side of the main sampling unit 1011 for connecting to the wiring harness fixture unit 102, so as to transmit the first sampling signal and the second sampling signal to the test unit 103 for testing through the wiring harness fixture unit 102.

[0081] For the harness tooling unit 102, multiple sets of modules to be tested include a main sampling unit 1011 and a corresponding connector 1013. The main sampling unit 1011 leads out N first connecting lines through the corresponding connector 1013. These N first connecting lines are used to transmit different signals respectively. Different signals here can be understood as different signal types. For example, they can be used to transmit message-related signals, power supply signals, alarm signals, etc.

[0082] At this time, assuming that there are M sets of modules to be tested, M is an integer greater than 1, and each set of modules to be tested will lead out N first connecting lines, then the entire multi-battery parallel testing system will lead out M*N first connecting lines, but the test unit 103 has not been changed and still corresponds to testing one set of modules to be tested, so it still only corresponds to N test interfaces. It can be seen that the M*N first connecting lines are difficult to be tested using the test unit 103 with N test interfaces, and the number of test interfaces is not suitable.

[0083] To address the above issues, a wiring harness tooling unit 102 is provided in an embodiment of the present application. The wiring harness tooling unit 102 connects the first connecting lines for transmitting the same signal on different modules under test in parallel to lead out a bus, thereby obtaining N second connecting lines led out by the wiring harness tooling unit 102.

[0084] For example, first connection lines used to transmit message-related signals on different modules under test are connected in parallel, and a bus is derived as a second connection line, and M sets of modules under test correspond to one second connection line used to transmit message-related signals;

[0085] For another example, first connection lines for transmitting power supply signals on different modules under test are connected in parallel, and then a bus is led out as a second connection line. M sets of modules under test correspond to one second connection line for transmitting power supply signals.

[0086] According to the above analysis, it can be seen that the number of second connecting lines finally led out through the wiring harness tooling unit 102 is N, which just corresponds to the N test interfaces of the test unit 103. The number of test interfaces is adapted, and the test unit 103 can be used to realize parallel testing of multiple batteries.

[0087] It should be noted that the above M and N can be specifically set according to actual conditions, such as Figure 3 As shown, M is set to 3 and N is set to 8 as an example, and this is not limited in the present application.

[0088] In other embodiments, the harness tooling unit 102 can also connect in parallel the first connecting lines used to transmit the same signal on the main sampling units corresponding to different batteries in at least two batteries to lead out at least two buses, so as to obtain X second connecting lines led out by the harness tooling unit, which are correspondingly connected to X test units 103, where X is an integer greater than 1 and less than M.

[0089] For example, the wiring harness tooling unit 102 can set up two sets of test units for testing three sets of modules to be tested, instead of setting up only one set of test units for testing; compared with using one set of test units to test the three sets of modules to be tested one by one, the present application can also shorten the test cycle to a certain extent and improve the test efficiency.

[0090] In an embodiment of the present application, a specific implementation method of connecting multiple sampling units and batteries and test units in parallel using a harness fixture unit is provided. Specifically, each main sampling unit corresponding to each main battery leads out N first connection lines through a connector set on one side thereof, and these N first connection lines are used to transmit different signals, such as signals related to the transmission message, power supply signals, alarm signals, etc. The harness fixture unit is used to connect the first connection lines used to transmit the same signal on the main sampling units corresponding to different batteries in parallel, and then lead out a bus as a second connection line to connect to the test unit. For example, after connecting the first connection lines used to transmit message-related signals on multiple main sampling units in parallel, a second connection line is led out and connected to the test unit. In this way, the number of second connection lines led out is consistent with the number of first connection lines on a single main sampling unit, so as to be equivalent to the number of test interfaces of multiple batteries and the test interface of a single battery, thereby ensuring that the parallel test results of multiple batteries are equivalent to the test results of a single battery, and achieving the effect of simultaneous testing of multiple batteries and shortening the test cycle.

[0091] According to some embodiments of the present application, optionally, Figure 2 As shown, the test unit 103 includes an oscilloscope 1031, and the N second connection lines include a current serial communication protocol line CCAN, and the current serial communication protocol line is connected to the oscilloscope 1031;

[0092] The oscilloscope 1031 is used to: display the waveform of the first target signal transmitted through the current serial communication protocol line CCAN in a preset visual interface;

[0093] The first target signal includes at least one of the first sampling signal and the second sampling signal, and the waveform displayed by the oscilloscope 1031 is used to determine whether there is a fault in the at least two batteries 200 .

[0094] It should be noted that Figure 2 In the figure, it is taken as an example that CCAN includes CCAN_H and CCAN_L, where CCAN_H and CCAN_L are a high current serial communication protocol line and a low current serial communication protocol line respectively.

[0095] In an embodiment of the present application, the test unit includes an oscilloscope, and the N second connecting lines include current serial communication protocol lines. The main sampling unit can be connected to the oscilloscope through the current serial communication protocol line, and send a first target signal to the oscilloscope, that is, send at least one of the first sampling signal and the second sampling signal, so that the oscilloscope can display the waveform of the first target signal in a pre-set visual interface, and the displayed waveform can be used to determine whether there is a fault in the corresponding at least two batteries, thereby realizing parallel detection of multiple batteries.

[0096] According to some embodiments of the present application, optionally, Figure 2 As shown, the test unit 103 also includes a host computer 1032, and the current serial communication protocol line CCAN is also connected to the host computer 1032;

[0097] The host computer 1032 is used to transmit serial communication protocol (CAN: Controller-area-network) messages with the at least two batteries 200 through the current serial communication protocol line CCAN;

[0098] Among them, the CAN message includes at least one of the first sampling signal and the second sampling signal, and the CAN message is used in conjunction with the waveform of the oscilloscope 1031 to determine whether there is a fault in the at least two batteries 200, or to determine the battery that has a fault in the at least two batteries 200.

[0099] In an embodiment of the present application, the test unit also includes a host computer, and the main sampling unit can be connected to the host computer through a current serial communication protocol line to send at least one of the first sampling signal and the second sampling signal to the host computer in the form of a CAN message. The CAN message is used to cooperate with the waveform of the oscilloscope to determine whether there is a fault in at least two batteries, or to locate the specific battery where the fault occurs. That is, the test unit can specifically cooperate with the host computer and the oscilloscope to achieve parallel testing of multiple batteries.

[0100] According to some embodiments of the present application, optionally, Figure 2 As shown, the test unit 103 further includes a vector signal transceiver 1033 (also referred to as Vector in the figure), and the current serial communication protocol line CCAN is connected to the host computer 1032 via the vector signal transceiver 1033;

[0101] The host computer 1032 is specifically used to transmit the CAN message between the at least two batteries 200 via the vector signal transceiver 1033 and the current serial communication protocol line CCAN.

[0102] Specifically, the host computer 1032 may send CAN messages to the main sampling units 1011 in the at least two sets of modules under test through the vector signal transceiver 1033 ; or, receive CAN messages from the main sampling units 1011 in the at least two sets of modules under test through the vector signal transceiver 1033 .

[0103] In an embodiment of the present application, the test unit also includes a vector signal transceiver, and the host computer is specifically connected to the current serial communication protocol line through the vector signal transceiver, that is, the host computer transmits CAN messages between the main sampling units corresponding to the multiple batteries through the vector signal transceiver, so as to perform parallel testing on multiple batteries through the CAN message and the waveform of the oscilloscope.

[0104] Exemplarily, in some embodiments, the N second connection lines include: a high current serial communication protocol line CCAN_H and a low current serial communication protocol line CCAN_L, which together constitute CCAN, and the test unit 103 includes: an oscilloscope 1031, a vector signal transceiver 1033 and a host computer 1032;

[0105] The specific connection relationship is as follows: the high current serial communication protocol line CCAN_H and the low current serial communication protocol line CCAN_L are both connected to the oscilloscope 1031 and the vector signal transceiver 1033, and the vector signal transceiver 1033 is also connected to the host computer 1032;

[0106] The oscilloscope 1031 is used to: display the waveform of the first target signal transmitted through the high current serial communication protocol line CCAN_H and the low current serial communication protocol line CCAN_L in a preset visual interface; wherein the first target signal includes at least one of the first sampling signal and the second sampling signal;

[0107] The host computer 1032 is used to: send CAN messages to the main sampling units 1011 in the at least two sets of modules to be tested through the vector signal transceiver 1033; or, receive CAN messages from the main sampling units 1011 in the at least two sets of modules to be tested through the vector signal transceiver 1033; wherein the CAN message includes at least one of the first sampling signal and the second sampling signal.

[0108] Specifically, the N second connecting wires led out from the harness tooling unit 102 include at least CCAN_H and CCAN_L, and CCAN_H and CCAN_L are used to transmit the first sampling signal and the second sampling signal. Specifically, the sampling signal can be transmitted to the oscilloscope 1031 to display at least one of the first sampling signal and the second sampling signal in the visual interface of the oscilloscope 1031, specifically displaying related waveforms, such as current waveforms, etc.

[0109] In some embodiments, in the visualization interface of the oscilloscope 1031, the waveforms of the power supply voltage signal (i.e., the power output signal) of the module to be tested, the signal at the KL30 end of the module to be tested, and the CCAN_H signal, etc. can also be synchronously displayed, so as to perform electrical testing on the module to be tested with reference to these waveforms, for example, determining whether there are faults in multiple sets of modules to be tested based on these waveforms.

[0110] In other embodiments, CCAN_H and CCAN_L may also transmit the sampling signals in the form of CAN messages via the vector signal transceiver 1033 to the host computer 1032 , and the host computer 1032 may also transmit CAN messages via the vector signal transceiver 1033 .

[0111] In an embodiment of the present application, the above-mentioned N second connecting lines include high and low current serial communication protocol lines, which are connected to an oscilloscope in the test unit, and are used to display the waveforms of the first sampling signal and / or the second sampling signal transmitted through the high and low current serial communication protocol lines in the visual interface of the oscilloscope, so as to facilitate qualitative judgment of whether multiple sets of modules to be tested have faults; in addition, the high and low current serial communication protocol lines are also connected to the host computer through the vector signal transceiver in the test unit, so that the host computer can transmit CAN messages to multiple sets of modules to be tested through the vector signal transceiver. For example, the battery in the module to be tested with a specific fault can be determined based on the CAN message, thereby realizing testing of the batteries in multiple sets of modules.

[0112] According to some embodiments of the present application, optionally, Figure 2 As shown, the host computer 1032 is also used for:

[0113] When it is determined through the waveform displayed by the oscilloscope 1031 that there is a fault in the at least two batteries 200, obtaining sub-messages corresponding to the at least two batteries 200 respectively according to the received CAN message;

[0114] At least one failed battery is determined from the at least two batteries 200 according to the sub-messages respectively corresponding to the at least two batteries 200 .

[0115] Specifically, firstly, the waveform displayed on the oscilloscope 1031 is used to qualitatively determine whether the batteries in the plurality of test modules are faulty. For example, whether a fault occurs can be determined based on whether the shape of the waveform displayed on the oscilloscope 1031 changes.

[0116] For example, assume that the power supply output signal, the signal at the KL30 terminal of the module to be tested, the current sampling signal, and the CCAN_H signal are synchronously displayed on the oscilloscope 1031;

[0117] For example, the power supply output signal is set to a sinusoidal wave signal, and the waveform of the power supply output signal displayed on the oscilloscope 1031 changes as a sinusoidal wave. After a certain moment, the waveform of the power supply output signal on the oscilloscope 1031 changes, for example, the value of one or several peaks becomes smaller. At this time, it can be qualitatively determined that there are faults in multiple sets of modules to be tested.

[0118] For another example, after a certain moment, the waveform of the current sampling signal displayed on the oscilloscope 1031 shows that the current becomes 0. At this time, it can be qualitatively determined that there are faults in the multiple sets of modules to be tested.

[0119] Through the oscilloscope 1031, it can only be determined that there is a fault in the multiple sets of modules under test participating in the test, and it is also necessary to support locating the specific one or several modules under test where the fault occurs. At this time, the host computer 1032 is needed to further assist in positioning.

[0120] Specifically, when the upper computer 1032 determines that there is a fault in the batteries in at least two sets of modules to be tested through the waveform displayed by the oscilloscope 1031, it can obtain the sub-messages corresponding to the batteries in the at least two sets of modules to be tested based on the received CAN message, and then determine at least one faulty battery from the batteries in the at least two sets of modules based on the sub-messages corresponding to the batteries in the at least two sets of modules to be tested. That is, the upper computer 1032 can obtain the sub-messages corresponding to the batteries in multiple sets of modules to be tested, and then locate one or more faulty batteries based on the sub-messages.

[0121] In an embodiment of the present application, during a specific test, it is possible to first determine qualitatively whether a fault occurs in a plurality of batteries through the waveform displayed on the oscilloscope. For example, if the waveform is abnormal, it can be determined that a fault occurs in the plurality of batteries. At this time, the sub-messages corresponding to each battery are obtained based on the total CAN message received, and then the specific battery with the fault is located from the plurality of batteries based on the sub-message. The present application first qualitatively determines whether there is a fault in a plurality of batteries. If it is determined that there is no fault, no further analysis is required. If it is determined that there is a fault, the sub-messages corresponding to each battery are used to locate the specific battery with the fault. This can effectively reduce the computational complexity of the fault test while supporting the fault test.

[0122] According to some embodiments of the present application, optionally, Figure 2 As shown, the sub-message includes message data and a CAN identifier, at least two of the CAN identifiers correspond one-to-one to the at least two batteries 200, and the message data is related to at least one of the first sampling signal and the second sampling signal;

[0123] The host computer 1032 is also specifically used for:

[0124] Determine at least one abnormal sub-message according to the message data in the sub-messages corresponding to the at least two batteries 200 respectively;

[0125] At least one faulty battery corresponding to the at least one abnormal sub-message is determined according to the CAN identifier in the at least one abnormal sub-message.

[0126] In an embodiment of the present application, a specific implementation method of locating a faulty battery using a host computer is provided. First, based on the message data in the sub-message, it is determined which sub-message or sub-messages have an abnormality, and then the CAN identifier in the abnormal sub-message is used to correspond to at least one battery to confirm that it is a faulty battery. On the basis of supporting fault testing, the calculation amount of fault testing is effectively reduced. The present application encodes multiple batteries, each battery corresponds to a unique CAN identifier, and the transmitted CAN message will carry the CAN identifier corresponding to the battery to be tested for distinction, which is convenient for the subsequent specific positioning of the faulty battery.

[0127] In other embodiments, the present application may also encode multiple modules to be tested, and each module to be tested also corresponds to a unique CAN identifier. In the transmitted CAN message, the CAN identifier corresponding to the module to be tested will be carried for distinction, so as to locate which one or several modules to be tested have failed.

[0128] According to some embodiments of the present application, optionally, Figure 2 As shown, the sub-message may also include a message timestamp;

[0129] The host computer 1032 is further configured to determine a fault occurrence time corresponding to the at least one faulty battery according to a message timestamp in the at least one abnormal sub-message.

[0130] In an embodiment of the present application, the host computer can also determine the specific time when the faulty battery corresponds to the fault according to the message timestamp in the abnormal sub-message as the fault occurrence time, which is convenient for testers to perform fault testing and subsequent analysis.

[0131] Exemplarily, in some embodiments, the sub-message may include message data, a message timestamp, and a CAN identifier, at least two of the CAN identifiers correspond one-to-one to the batteries in the at least two sets of modules to be tested, and the message data is related to at least one of the first sampling signal and the second sampling signal;

[0132] The host computer 1032 may determine at least one abnormal sub-message according to the message data in the sub-messages respectively corresponding to the batteries in the at least two sets of modules to be tested, and then determine at least one faulty battery corresponding to the at least one abnormal sub-message according to the CAN identifier in the at least one abnormal sub-message;

[0133] The host computer 1033 may also determine the fault occurrence time corresponding to the at least one faulty battery according to the message timestamp in the at least one abnormal sub-message.

[0134] Specifically, each sub-message includes message data, message timestamp and CAN identifier. The message data is related to at least one of the first sampling signal and the second sampling signal, and is used to specifically determine whether a sub-message is abnormal. If it is determined to be abnormal, the sub-message is used as an abnormal sub-message; the message timestamp is used to represent the time when the message is sent, and can be used as a reference to determine the time when the battery fails; the CAN identifier is an identifier obtained by encoding the batteries in multiple sets of modules to be tested. The batteries in each set of modules to be tested correspond to a unique CAN identifier. When sending a CAN message, the CAN identifier is sent synchronously to identify the battery in the module to be tested corresponding to the CAN message, so as to facilitate the location of the specific battery that has failed.

[0135] According to some embodiments of the present application, optionally, Figure 2 As shown, the host computer 1032 is also used for:

[0136] A second target signal to be tested is selected from at least one of the first sampling signal and the second sampling signal through a signal filter provided in the host computer 1032 as the message data.

[0137] Specifically, in order to select the required signals for independent monitoring and analysis, a signal filter can be set in the host computer 1032 to filter out the required signals from the sampled signals as message data, and then determine whether a sub-message is abnormal based on the message data.

[0138] In an embodiment of the present application, a signal filter is also provided in the host computer, which can select the second target signal to be tested from the received sampling signal as the message data, and perform independent monitoring and analysis without monitoring and analyzing all signals, thereby making the testing process more convenient.

[0139] The following example illustrates the multi-battery parallel testing system provided by the present application. The present application relates to the optimization of an electrical testing system and proposes a multi-battery parallel testing system for connecting multiple parallel samples in parallel and performing electrical tests simultaneously. The system is also suitable for communication inspection and debugging of samples.

[0140] like Figure 3 As shown, firstly, the three sets of modules to be tested are respectively Figure 3Perform connection settings. Use data sampling lines (twisted pair) to connect the two CSCs to the master battery and the slave battery respectively, and then use low-voltage lines to connect the master and slave CSCs, and the master and slave batteries respectively. After this connection, the Master CSC collects the signals of the master and slave batteries, and it can be considered that the actual sample under test is the master battery among the three modules to be tested.

[0141] Lead out low-voltage harnesses (i.e., the first connecting wires mentioned above) from the connectors of the three sets of modules to be tested and connect to the corresponding connectors of the harness tooling unit. The three sets of low-voltage harnesses are connected in parallel in the harness tooling unit. The harness tooling unit simulates the communication status of the whole vehicle and integrates the harnesses of multiple sets of modules to be tested into a set of buses. The second connecting wires led out include CCAN_L, CCAN_H, 12V+ signal line for power supply, wake-up signal (Wakeup) line, alarm input (Alarm-in) line, alarm output (Alarm-out) line and two ground (GND) lines.

[0142] The equipment involved in the electrical test includes: voltage stabilized power supply, signal source, oscilloscope, vector and host computer. Among them, the voltage stabilized power supply and signal source are integrated in the waveform generator in the figure.

[0143] The wiring harnesses of the three modules to be tested are connected in parallel in the wiring harness tooling unit, and the derived bus is connected to a set of test equipment (that is, the above-mentioned test unit), so that communication and testing with the three modules to be tested can be completed simultaneously, thereby shortening the test cycle and saving equipment resources.

[0144] After the three sets of modules under test are connected to the test unit through the wiring harness tooling unit, the 12V system network is powered by the regulated power supply in the common waveform generator. The waveform emitted by the waveform generator will pass through the wiring harness tooling unit and supply the 12V+ ends of the three modules under test respectively.

[0145] The current monitored by the oscilloscope in the test unit is the total current of the three modules under test, which is three times the current of a single module under test. The host computer in the test unit receives and sends CAN messages through Vector. In addition, the waveform generator is also connected to the oscilloscope through a current probe so that the oscilloscope can display the current at the positive pole of the waveform generator. The positive pole of the waveform generator is also connected to the oscilloscope so that the oscilloscope can display the voltage at the positive pole of the waveform generator to assist in electrical testing.

[0146] Before performing electrical testing, encode the three sets of modules to be tested separately to identify the different modules to be tested. The specific operations are as follows:

[0147] In the Vector tool, set different identifiers for each message sent by the CAN box, that is, use different CANIDs to identify the messages. By setting signal filters, select the required messages for independent monitoring and analysis. Monitor the waveform of the oscilloscope in real time. If a module to be tested fails, the abnormality can be qualitatively identified through the waveform, and the test is terminated at this time. Analyze the message data again, locate the time of the fault through the message timestamp, check whether a single message is abnormal or a series of messages are abnormal, and then locate the faulty module separately through the CAN ID.

[0148] A single set of modules to be tested is set up for comparative experiments to demonstrate the equivalent effect brought about by a multi-battery parallel testing system proposed in the embodiment of the present application.

[0149] After the modules under test are connected to the test unit through the harness fixture unit, interference is injected into the three modules under test simultaneously through the waveform generator.

[0150] (one) Figure 4 This is a test waveform diagram of a multi-battery parallel test system for superimposed alternating current proposed in an embodiment of the present application. Figure 5 It is a schematic diagram of the test waveform of the single battery test system in the related technology about superimposed AC. Figure 4 and Figure 5 Only qualitatively displayed, comparison Figure 4 and Figure 5 Taking the superimposed AC waveform data as an example, it can be found from the figure that when the voltage output by the power supply is the same, the KL30 terminal voltage is the same when multiple sets of modules are tested in parallel and when a single set of modules is tested. The current of the loop in the test of multiple sets of modules is between -200mA and 700mA, while the current of the loop in the test of a single set of modules is between -65mA and 230mA, which is roughly 3 times the relationship between the two, and the communication of the two test systems is normal.

[0151] (two) Figure 6 1 is a test waveform diagram of a multi-battery parallel test system for pin interruption proposed in an embodiment of the present application. Figure 7 It is a test waveform diagram of pin interruption in a single battery test system in the related art. Figure 6 and Figure 7 Only qualitatively displayed, comparison Figure 6 and Figure 7, taking the waveform of the KL30 end of the module under test interrupted for 10s as an example, it can be found from the figure that when the KL30 end is interrupted, the communication of the two test systems is interrupted and the current becomes 0; when the connection is restored, the communication is restored and the current is restored to the normal working current. The working current when multiple sets of modules under test are tested in parallel is 87mA, and the working current when a single set of modules under test is tested is 27mA, which is roughly 3 times the relationship between the two. When the test is abnormal, the fault can be qualitatively found through the waveform first, and then the CAN message data can be checked to locate the faulty module under test, so as to locate the faulty battery as the battery in the faulty module under test.

[0152] The embodiment of the present application is based on the communication principles of automotive electronic components and proposes a multi-battery parallel testing system for parallel testing of multiple batteries. By analyzing the working mode and functional parameters of the modules to be tested in the whole vehicle, three sets of modules to be tested are tested in parallel and fault injection testing is performed simultaneously.

[0153] The core idea is to simulate the whole vehicle communication mode to connect samples. The multi-battery parallel test system designed by it can ensure that the test results of multiple batteries are equivalent to those of single battery, thereby achieving the effect of simultaneous testing of multiple batteries and shortening the test cycle.

[0154] In addition, an embodiment of the present application also proposes a harness tooling unit for organizing multiple sample communication harnesses and leading out the CAN bus. For example, by simulating the electrical layout of the entire vehicle, the low-voltage communication harnesses of multiple batteries are connected in parallel and led out to the bus, thereby achieving the effect of using one set of test units to communicate with multiple batteries.

[0155] In addition, the embodiment of the present application also proposes a method for identifying and locating the battery in the faulty module, specifically encoding multiple sets of modules to be tested, checking the CAN message of the host computer when a waveform data failure occurs, and thereby achieving the effect of locating the faulty module number.

[0156] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A multi-battery parallel testing system, It is characterized in that The system comprises: At least two sampling units, harness fixture unit and test unit; Among them, the at least two sampling units are connected to the test unit in parallel through the wiring harness tooling unit, and the at least two sampling units are used to sample the at least two batteries to be tested to obtain sampling signals, and transmit the sampling signals corresponding to the at least two batteries to the test unit through the wiring harness tooling unit, and the test unit is used to perform testing based on the sampling signals corresponding to the at least two batteries.

2. The multi-battery parallel testing system according to claim 1, It is characterized in that The at least two sampling units include at least two master sampling units and at least two slave sampling units, and the at least two batteries include at least two master batteries and at least two slave batteries; Among them, each of the main sampling units is used to be connected to each of the main batteries, and is used to sample each of the main batteries to obtain a first sampling signal. Each of the slave sampling units is used to be connected to each of the slave batteries, and is used to sample each of the slave batteries to obtain a second sampling signal. Each of the slave sampling units is also connected to each of the main sampling units, and is used to transmit the second sampling signal to each of the main sampling units. The at least two main sampling units are connected to the test unit in parallel through the wiring harness tooling unit, and the test unit is used to test the at least two batteries according to the first sampling signal corresponding to each of the main batteries and the second sampling signal corresponding to each of the slave batteries.

3. The multi-battery parallel testing system according to claim 2, It is characterized in that A connector is also provided on one side of each of the main sampling units, and each of the main sampling units leads out N first connecting wires for transmitting different signals through the connector. The wiring harness fixture unit is used to connect in parallel the first connecting wires for transmitting the same signal on the main sampling units corresponding to different batteries in the at least two batteries, and then lead out a bus to obtain N second connecting wires led out by the wiring harness fixture unit. The wiring harness fixture unit is connected to the test unit through the N second connecting wires, and N is an integer greater than 0.

4. The multi-battery parallel testing system according to claim 3, It is characterized in that The test unit includes an oscilloscope, the N second connection lines include current serial communication protocol lines, and the current serial communication protocol lines are connected to the oscilloscope; The oscilloscope is used to: display the waveform of the first target signal transmitted through the current serial communication protocol line in a preset visual interface; The first target signal includes at least one of the first sampling signal and the second sampling signal, and the waveform displayed by the oscilloscope is used to determine whether there is a fault in the at least two batteries.

5. The multi-battery parallel testing system according to claim 4, It is characterized in that The test unit also includes a host computer, and the current serial communication protocol line is also connected to the host computer; The host computer is used to: transmit serial communication protocol CAN messages to the at least two batteries through the current serial communication protocol line; The CAN message includes at least one of the first sampling signal and the second sampling signal, and the CAN message is used in conjunction with the waveform of the oscilloscope to determine whether there is a fault in the at least two batteries, or to determine which battery has a fault among the at least two batteries.

6. The multi-battery parallel testing system according to claim 5, It is characterized in that The test unit further comprises a vector signal transceiver, and the current serial communication protocol line is connected to the host computer via the vector signal transceiver; The host computer is specifically used to transmit the CAN message between the at least two batteries via the vector signal transceiver and the current serial communication protocol line.

7. The multi-battery parallel testing system according to claim 5 or 6, It is characterized in that The host computer is also used for: When it is determined through the waveform displayed by the oscilloscope that there is a fault in the at least two batteries, obtaining sub-messages corresponding to the at least two batteries respectively according to the received CAN message; At least one faulty battery is determined from the at least two batteries according to the sub-messages respectively corresponding to the at least two batteries.

8. The multi-battery parallel testing system according to claim 7, It is characterized in that The sub-message includes message data and a CAN identifier, at least two of the CAN identifiers correspond one-to-one to the at least two batteries, and the message data is related to at least one of the first sampling signal and the second sampling signal; The host computer is also specifically used for: Determining at least one abnormal sub-message according to the message data in the sub-messages corresponding to the at least two batteries respectively; At least one faulty battery corresponding to the at least one abnormal sub-message is determined according to the CAN identifier in the at least one abnormal sub-message.

9. The multi-battery parallel testing system according to claim 8, It is characterized in that The sub-message also includes a message timestamp; The host computer is further used to determine the fault occurrence time corresponding to the at least one faulty battery according to the message timestamp in the at least one abnormal sub-message.

10. The multi-battery parallel testing system according to claim 8 or 9, It is characterized in that The host computer is also used for: A second target signal to be tested is selected from at least one of the first sampling signal and the second sampling signal through a signal filter provided in the host computer as the message data.

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