CN117590257B

CN117590257B - Test system and test method

Info

Publication number: CN117590257B
Application number: CN202410050993.7A
Authority: CN
Inventors: 郝鹏飞; 连登伟; 赵家声; 李扬虎
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-01-12
Filing date: 2024-01-12
Publication date: 2024-05-14
Anticipated expiration: 2044-01-12
Also published as: CN117590257A

Abstract

The application discloses a test system and a test method, wherein the test system comprises: a detection device; the switch circuit comprises a plurality of switch modules, wherein first ends of the switch modules are electrically connected with the detection equipment, and second ends of the switch modules are electrically connected with a plurality of interfaces of the battery pack to be detected; the control module is electrically connected with the control ends of the switch modules and is used for controlling the on-off states of the switch modules. The embodiment of the application can improve the test efficiency of the test system.

Description

Test system and test method

Technical Field

The application relates to the technical field of testing, in particular to a testing system and a testing method.

Background

New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, the batteries are increasingly used in the field of energy storage and the like.

In order to improve the safety of the battery pack, it is generally necessary to perform a test such as an End of line (EOL) test on the battery pack. However, current test systems have a relatively low test efficiency.

Disclosure of Invention

The embodiment of the application provides a test system and a test method, which can improve the test efficiency of the test system.

In a first aspect, an embodiment of the present application provides a test system, including: a detection device; the switch circuit comprises a plurality of switch modules, wherein first ends of the switch modules are electrically connected with the detection equipment, and second ends of the switch modules are electrically connected with a plurality of interfaces of the battery pack to be detected; the control module is electrically connected with the control ends of the switch modules and is used for controlling the on-off states of the switch modules.

Based on the technical scheme of the embodiment of the application, the on-off states of the switch modules are controlled by the control module, so that the electric connection between the detection equipment and different interfaces of the battery pack to be tested can be switched, the testing of a plurality of different testing items can be realized, the automatic switching can be realized, the manual switching and the circuit connection are not needed, the testing efficiency of the testing system is improved, and the probability of the circuit connection error is reduced.

According to an embodiment of the first aspect of the application, the test system further comprises a multi-channel selection circuit and a single-channel selection circuit; the control module is electrically connected with the control end of the switch module through a multi-channel selection circuit and a single-channel selection circuit which are connected in parallel.

According to any one of the foregoing embodiments of the first aspect of the present application, the multi-channel selection circuit includes a plurality of first switching devices connected in parallel, and the plurality of first switching devices are electrically connected to control terminals of the plurality of switching modules in a one-to-one correspondence manner; the control module controls the conduction of the at least two switch modules through the at least two conducted first switch devices.

According to any one of the foregoing embodiments of the first aspect of the present application, the single-channel selection circuit includes a plurality of second switching devices connected in parallel, and the plurality of second switching devices are electrically connected to control terminals of the plurality of switching modules in a one-to-one correspondence manner; the control module controls the conduction of one switch module through a second conduction switch device.

According to any of the foregoing embodiments of the first aspect of the present application, the test system further includes a switching module, and the control module is electrically connected to the multi-channel selection circuit and the single-channel selection circuit in parallel through the switching module.

According to any of the foregoing embodiments of the first aspect of the present application, the switching module includes a third switching device and a fourth switching device; the control module is electrically connected with the multi-channel selection circuit through a third switching device, and is electrically connected with the single-channel selection circuit through a fourth switching device.

According to any of the foregoing embodiments of the first aspect of the present application, the test system further includes a driving module electrically connected between the control module and the control end of the switch module.

According to any of the foregoing embodiments of the first aspect of the present application, the test system further includes an isolation module electrically connected between the control module and the control end of the switch module.

According to any of the foregoing embodiments of the first aspect of the present application, the test system includes a first main line and a second main line, and the switch module includes a first switch module and a second switch module; the first connecting end of the detection device is electrically connected with the first main line, and the second connecting end of the detection device is electrically connected with the second main line; the first end of the first switch module is electrically connected with the first main line, and the second end of the first switch module is used for being electrically connected with an interface of the battery pack to be tested; the first end of the second switch module is electrically connected with the second main line, and the second end of the second switch module is used for being electrically connected with an interface of the battery pack to be tested.

According to any one of the foregoing embodiments of the first aspect of the present application, the test system further includes a plurality of first interfaces, where the plurality of first interfaces are electrically connected to the plurality of interfaces of the battery pack to be tested in a one-to-one correspondence manner; each first interface is electrically connected to a second end of one first switch module and a second end of one second switch module, respectively.

According to any of the foregoing embodiments of the first aspect of the present application, the detecting device includes a plurality of detecting instruments connected in parallel to the first main line and the second main line.

According to any one of the foregoing embodiments of the first aspect of the present application, the test system further includes a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module; the first connecting end of the detecting instrument is electrically connected with the first main line through the third switch module, and the second connecting end of the detecting instrument is electrically connected with the second main line through the fourth switch module; the first end of the fifth switch module is electrically connected with the first main line, and the second end of the fifth switch module is used for being electrically connected with the shell of the battery pack to be tested; the first end of the sixth switch module is electrically connected with the second main line, and the second end of the sixth switch module is used for being electrically connected with the shell of the battery pack to be tested.

According to any one of the foregoing embodiments of the first aspect of the present application, the plurality of detection apparatuses includes at least one of an insulation voltage withstanding apparatus, a voltage and resistance value acquisition apparatus, an equipotential tester, an oscilloscope, a programmable power supply, a trigger signal generation apparatus, and a rotation-varying device.

According to any of the foregoing embodiments of the first aspect of the present application, the plurality of first interfaces includes a three-phase electrical interface, a first voltage interface, a second voltage interface, and a target direct current interface; the three-phase electric interface comprises a first phase electric interface, a second phase electric interface and a third phase electric interface, the first voltage interface comprises a first voltage positive electrode interface and a first voltage negative electrode interface, and the target direct current interface comprises a direct current positive electrode interface and a direct current negative electrode interface; the first switch module comprises a first switch unit, a third switch unit, a fifth switch unit, a seventh switch unit, a ninth switch unit, an eleventh switch unit, a thirteenth switch unit and a fifteenth switch unit; the second switch module comprises a second switch unit, a fourth switch unit, a sixth switch unit, an eighth switch unit, a tenth switch unit, a twelfth switch unit, a fourteenth switch unit and a sixteenth switch unit; the first phase electric interface is electrically connected with the first main line through the first switch unit, and the first phase electric interface is electrically connected with the second main line through the second switch unit; the second phase electric interface is electrically connected with the first main line through a third switch unit, and the second phase electric interface is electrically connected with the second main line through a fourth switch unit; the third phase electric interface is electrically connected with the first main line through a fifth switch unit, and the third phase electric interface is electrically connected with the second main line through a sixth switch unit; the first voltage positive electrode interface is electrically connected with the first main line through a seventh switch unit, and the first voltage positive electrode interface is electrically connected with the second main line through an eighth switch unit; the first voltage negative electrode interface is electrically connected with the first main line through a ninth switch unit, and the first voltage negative electrode interface is electrically connected with the second main line through a tenth switch unit; the second voltage interface is electrically connected with the first main line through an eleventh switch unit, and the second voltage interface is electrically connected with the second main line through a twelfth switch unit; the direct current positive electrode interface is electrically connected with the first main line through a thirteenth switch unit, and the direct current positive electrode interface is electrically connected with the second main line through a fourteenth switch unit; the direct current negative electrode interface is electrically connected with the first main line through a fifteenth switch unit, and is electrically connected with the second main line through a sixteenth switch unit.

According to any one of the preceding embodiments of the first aspect of the present application, the switch module includes a relay, and the switch circuit is disposed on a circuit board.

In a second aspect, an embodiment of the present application provides a testing method, applied to the testing system as in the first aspect, where the testing method includes: and in the testing stage, the on-off states of the switch modules are controlled, and the battery pack to be tested is tested.

According to any one of the foregoing embodiments of the second aspect of the present application, the test system includes a plurality of first interfaces, and the plurality of first interfaces are used for electrically connecting with the plurality of interfaces of the battery pack to be tested in a one-to-one correspondence manner; the plurality of first interfaces comprise a three-phase electrical interface, a first voltage interface, a second voltage interface and a target direct current interface; the three-phase electric interface comprises a first phase electric interface, a second phase electric interface and a third phase electric interface, the first voltage interface comprises a first voltage positive electrode interface and a first voltage negative electrode interface, and the target direct current interface comprises a direct current positive electrode interface and a direct current negative electrode interface.

According to any of the foregoing embodiments of the second aspect of the present application, in a testing stage, the on-off states of the plurality of switch modules are controlled, and the battery pack to be tested is tested, including: in the short circuit detection stage, a switch module connected with the three-phase electric interface and the first voltage interface is controlled to be conducted, the resistance value of a first target interface of the battery pack to be detected relative to a reference end is detected, and the first target interface comprises an interface connected with the three-phase electric interface in the battery pack to be detected and an interface connected with the first voltage interface in the battery pack to be detected.

According to any of the foregoing embodiments of the second aspect of the present application, in a testing stage, the on-off states of the plurality of switch modules are controlled, and the battery pack to be tested is tested, including: in the insulation voltage-withstanding test stage, a switch module connected with the three-phase electric interface and the first voltage interface is controlled to be conducted, a voltage signal with a first voltage value is provided for the three-phase electric interface and the first voltage interface, the resistance value of a first target interface of a battery pack to be tested relative to a reference end is detected, and the first target interface comprises an interface connected with the three-phase electric interface in the battery pack to be tested and an interface connected with the first voltage interface in the battery pack to be tested.

According to any of the foregoing embodiments of the second aspect of the present application, in a testing stage, the on-off states of the plurality of switch modules are controlled, and the battery pack to be tested is tested, including: in the insulation test stage of the direct current positive loop, a switch module connected with a direct current positive electrode interface is controlled to be conducted, a voltage signal with a first voltage value is provided for the direct current positive electrode interface, the resistance value of a second target interface of the battery pack to be tested relative to a reference end is detected, and the second target interface comprises an interface connected with the direct current positive electrode interface in the battery pack to be tested; in the insulation test stage of the direct current negative circuit, a switch module connected with a direct current negative electrode interface is controlled to be conducted, a voltage signal with a first voltage value is provided for the direct current negative electrode interface, the resistance value of a third target interface of the battery pack to be tested relative to a reference end is detected, and the third target interface comprises an interface connected with the direct current negative electrode interface in the battery pack to be tested.

According to any one of the foregoing embodiments of the second aspect of the present application, the test phase includes an output voltage test phase including at least one of a three-phase electrical phase-to-phase voltage test phase, a second voltage output voltage test phase, and a first voltage output voltage test phase; in the testing stage, the on-off states of the switch modules are controlled, and the battery pack to be tested is tested, which comprises the following steps: in the phase of testing the voltage between the three-phase electric phases, the switching module connected with any two-phase electric interfaces in the three-phase electric interfaces is controlled to be conducted, and the voltage between any two-phase electric interfaces is detected; in a second voltage output voltage testing stage, controlling a switch module connected with a second voltage interface to be conducted, and detecting the voltage of the second voltage interface; and in the first voltage output voltage testing stage, controlling the switch module connected with the first voltage interface to be conducted, and detecting the voltage of the first voltage interface.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of another circuit of the test system according to the embodiment of the present application;

FIG. 3 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 4 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 5 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 6 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 7 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 8 is a schematic circuit diagram of a test system according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a test flow of a test system according to an embodiment of the present application;

Fig. 10 is a schematic flow chart of a test method according to an embodiment of the present application.

In the drawings, the drawings are not necessarily to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the particular embodiments described herein are meant to be illustrative of the application only and not limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the application by showing examples of the application.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In embodiments of the present application, the term "electrically connected" may refer to two components being directly electrically connected, or may refer to two components being electrically connected via one or more other components.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Accordingly, it is intended that the present application covers the modifications and variations of this application provided they come within the scope of the appended claims (the claims) and their equivalents. The embodiments provided by the embodiments of the present application may be combined with each other without contradiction.

Before describing the technical solution provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application firstly specifically describes the problems existing in the related art:

In order to improve the safety of the battery pack, it is generally necessary to perform a test such as an End of line (EOL) test on the battery pack. However, current test systems have a relatively low test efficiency. In addition, for example, current test systems are generally suitable for testing during the battery pack development stage, making EOL testing difficult to implement.

In order to solve the technical problems in the related art, the embodiment of the application provides a test system and a test method, which can improve the test efficiency of the test system.

The test system provided by the embodiment of the application is first described below.

Fig. 1 is a schematic circuit diagram of a test system according to an embodiment of the present application. As shown in fig. 1, a test system 10 provided by an embodiment of the present application may include a detection device 100, a switching circuit 110, and a control module 120. In some embodiments, the test system 10 may include one or more test devices 100 (or test instruments), as the application is not limited in this regard. For example, a plurality of test devices 100 may be used for testing of different test items.

The switching circuit 110 includes a plurality of switching modules 111, first ends of the plurality of switching modules 111 may be electrically connected to the sensing device 100, and second ends of the plurality of switching modules 111 may be used to electrically connect to a plurality of interfaces of a battery pack (not shown in the drawing) to be tested. The application is not limited to the type of the battery pack to be tested. For example, in some examples, a Battery pack to be tested may include a Battery module, a Battery monitoring unit (Cell Supervision Circuit, CSC), and a Battery management system (Battery MANAGEMENT SYSTEM, BMS). The battery pack to be tested may include one or more battery modules. One battery module may include a plurality of unit cells connected in series or parallel or in series-parallel. The series-parallel connection refers to that a plurality of single battery cells are connected in series or in parallel.

The battery monitoring unit can be used for measuring data such as voltage, current and/or temperature of the single battery cell, and then the data such as voltage, current and/or temperature of the single battery cell is transmitted to the battery management system. The battery management system can be used for managing the battery pack to be tested, such as receiving data of voltage, current, temperature and the like of the single battery cell, calculating a State of Charge (SOC) and a State of Health (SOH), and completing battery precharge and Charge/discharge management.

For example, in some examples, the battery pack to be tested may be a domain controlled battery pack. The domain control battery pack may be provided with a battery module, a battery monitoring unit, and a battery management system, for example, a high voltage power distribution box (PDU), an On Board Charger (OBC), a direct current charging circuit, a direct current converter (DC-DC), a direct current-alternating current converter (DC-AC), a vehicle controller (Vehicle Control Unit, VCU), and/or a Motor Controller (MCU), etc. In some embodiments, the test system 10 may be used to perform testing of a plurality of test items on a domain controlled battery pack.

The control module 120 may be electrically connected to the control terminals of the plurality of switch modules 111, where the control module 120 is configured to control the on-off states of the plurality of switch modules 111. The application is not limited to the type of control module 120, for example, in some examples, control module 120 may include a single-chip microcomputer.

According to the test system provided by the embodiment of the application, the on-off states of the switch modules are controlled by the control module, so that the detection equipment can be switched to be electrically connected with different interfaces of the battery pack to be tested, the test of a plurality of different test items can be realized, automatic switching can be realized, manual switching and circuit connection are not needed, the test efficiency of the test system is improved, and the probability of circuit connection errors is reduced.

Fig. 2 is another circuit schematic diagram of a test system according to an embodiment of the present application. As shown in fig. 2, according to some embodiments of the present application, optionally, the test system 10 provided by the embodiments of the present application may further include a multi-channel selection circuit 21 and a single-channel selection circuit 22. The control module 120 may be electrically connected to the control terminal of the switch module 111 through a multi-channel selection circuit 21 and a single-channel selection circuit 22 connected in parallel. That is, the control module 120 may control the on-off states of the plurality of switch modules 111 through the multi-channel selection circuit 21, and the control module 120 may also control the on-off states of the plurality of switch modules 111 through the single-channel selection circuit 22.

The multi-channel selection circuit 21 may also be referred to as a multi-channel amplifying circuit, where the multi-channel selection circuit 21 may include a plurality of parallel first channels (not shown in fig. 2), at least two first channels in the multi-channel selection circuit 21 may be controlled to be turned on, and the control module 120 may provide an enable signal to the control terminals of the at least two switch modules 111 through the at least two first channels that are turned on to control the at least two switch modules 111 to be turned on.

In this way, the detection device 100 may be connected to at least two interfaces of the battery pack to be detected through the at least two on-state switch modules 111, so as to detect the at least two interfaces of the battery pack to be detected. For example, at high voltage of the battery pack to be tested, parallel detection of at least two interfaces of the battery pack to be tested can be achieved.

The single channel selection circuit 22 may include a plurality of parallel second channels (not shown in fig. 2), and one of the second channels in the single channel selection circuit 22 may be controlled to be turned on, so that the control module 120 may provide an enable signal to the control terminal of one of the switch modules 111 through the turned-on one of the second channels in the single channel selection circuit 22 to control the one of the switch modules 111 to be turned on.

Since only one second channel in the single channel selection circuit 22 is on and the other second channels are off, the interlocking between any two second channels can be realized, and the interlocking between any two switch modules 111 can be further realized. That is, the single channel selection circuit 22 may select one of the switch modules 111 to be turned on, and lock the other switch modules 111 to be turned off. In this way, when the battery pack to be tested provides the high voltage signal to the test system 10, since only one switch module 111 is turned on, the high voltage signal of the battery pack to be tested can only enter the test system 10 through one switch module 111 that is turned on, and other switch modules 111 that are turned off can prevent the high voltage signal of the battery pack to be tested from entering other interfaces or other detection devices in the test system 10, so as to realize protection of the test system 10.

In this way, the detection device 100 may communicate with an interface of the battery pack to be detected through the on one switch module 111, so as to implement detection of the interface of the battery pack to be detected. For example, protection of the test system 10 may be achieved by an interlock mechanism of the single channel selection circuit 22 at high voltages on the battery pack under test.

Fig. 3 is a schematic circuit diagram of a test system according to an embodiment of the present application. As shown in fig. 3, the multi-channel selection circuit 21 may optionally include a plurality of first switching devices 31 connected in parallel, according to some embodiments of the application. For example, in some examples, the multi-channel selection circuit 21 may include a plurality of parallel first channels T1, and at least one first switching device 31 may be disposed on each of the first channels T1. The plurality of first switching devices 31 may be electrically connected to the control terminals Q of the plurality of switching modules 111 in a one-to-one correspondence. Illustratively, the first switching device 31 may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an insulated gate bipolar transistor (Insulate-Gate Bipolar Transistor, IGBT), or a transistor or the like switching device. The first switching device 31 in fig. 3 is shown in a simple drawing of a switch.

The control module 120 may control the at least two switching modules 111 to be turned on through the at least two turned-on first switching devices 31. For example, the control module 120 may provide an enable signal to control terminals of the two switching modules 111 connected to the at least two first switching devices 31 through the at least two first switching devices 31 that are turned on to control the at least two switching modules 111 connected to the at least two first switching devices 31 that are turned on to be turned on.

As shown in fig. 3, the single channel selection circuit 22 may optionally include a plurality of second switching devices 32 in parallel, according to some embodiments of the application. For example, in some examples, the single channel selection circuit 22 may include a plurality of parallel second channels T2, each of which second channels T2 may have at least one second switching device 32 disposed thereon. The plurality of second switching devices 32 may be electrically connected to the control terminals of the plurality of switching modules 111 in a one-to-one correspondence. Illustratively, the second switching device 32 may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an insulated gate bipolar transistor (Insulate-Gate Bipolar Transistor, IGBT), or a transistor or the like switching device. The second switching device 32 in fig. 3 is shown in a simple drawing of a switch.

The control module 120 may control the conduction of one of the switch modules 111 through one of the turned-on second switch devices 32. For example, the control module 120 may provide an enable signal to a control terminal of a switching module 111 connected to the conductive one of the second switching devices 32 through the conductive one of the second switching devices 32 to control the conductive one of the switching modules 111 connected to the conductive one of the second switching devices 32.

Fig. 4 is a schematic circuit diagram of a test system according to an embodiment of the present application. As shown in fig. 4, the test system 10 may optionally further include a switching module 40, and the control module 120 may be electrically connected to the multi-channel selection circuit 21 and the single-channel selection circuit 22 in parallel through the switching module 40, according to some embodiments of the present application. The switching control module 120 may be in communication with the control terminal of the switching module 111 through the multi-channel selection circuit 21 by the switching module 40, or the switching control module 120 may be in communication with the control terminal of the switching module 111 through the single-channel selection circuit 22.

As shown in fig. 4, in some specific embodiments, the switching module 40 may optionally include a third switching device 43 and a fourth switching device 44. The control module 120 may be electrically connected to the multi-channel selection circuit 21 through the third switching device 43, and the control module 120 may be electrically connected to the single-channel selection circuit 22 through the fourth switching device 44. The third switching device 43 and the fourth switching device 44 may include Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), insulated gate bipolar transistor (Insulate-Gate Bipolar Transistor, IGBT), or transistor switching devices. The third switching device 43 and the fourth switching device 44 in fig. 4 are shown in a simple drawing of a switch.

The fourth switching device 44 may be turned off when the third switching device 43 is turned on. In this manner, the control module 120 may communicate with the control terminal of the switch module 111 through the multi-channel selection circuit 21.

When the fourth switching device 44 is turned on, the third switching device 43 may be turned off. In this manner, the control module 120 may communicate with the control terminal of the switch module 111 through the single channel selection circuit 22.

In this way, by providing the third switching device 43 and the fourth switching device 44, it is possible to flexibly switch between the multi-channel selection circuit 21 and the single-channel selection circuit 22.

It should be noted that, as shown in fig. 3, in other embodiments, alternatively, the switching module 40 may not be provided, and the switching between the multi-channel selection circuit 21 and the single-channel selection circuit 22 may be directly implemented by controlling the on-off states of the first switching device 31 and the second switching device 32.

For example, at least part of the first switching devices 31 in the multi-channel selection circuit 21 may be controlled to be turned on, and all of the second switching devices 32 in the single-channel selection circuit 22 may be controlled to be turned off, so that the control module 120 communicates with the control terminal of the switching module 111 through the multi-channel selection circuit 21.

For example, one of the second switching devices 32 in the single-channel selection circuit 22 may be controlled to be turned on, and all the first switching devices 31 in the multi-channel selection circuit 21 may be controlled to be turned off, so that the control module 120 communicates with the control terminal of the switching module 111 through the single-channel selection circuit 22.

Fig. 5 is a schematic circuit diagram of a test system according to an embodiment of the present application. As shown in fig. 5, the test system 10 may optionally further include a driving module 51 according to some embodiments of the present application, and the driving module 51 may be electrically connected between the control module 120 and the control terminal of the switching module 111. For example, in some examples, the control module 120 may be electrically connected to the control terminal of the switch module 111 through the multi-channel selection circuit 21 and the single-channel selection circuit 22 in parallel, and the driving module 51 in sequence.

In some examples, the voltage, current, and/or power of the control signal output by the control module 120 may be lower, and the control signal of the lower voltage, current, and/or power may not be able to better control the on-off state of the switch module 111. Therefore, by adding the driving module 51, the driving module 51 can be used for amplifying the voltage, the current and/or the power of the control signal output by the control module 120, and then transmitting the control signal after the voltage, the current and/or the power is amplified to the control end of the switch module 111. In this way, the on-off state of the switch module 111 can be well controlled.

In some specific examples, the switch module 111 may include a relay and the control terminal of the switch module 111 may include a coil of the relay. Accordingly, the drive module 51 may include a relay drive module.

As shown in fig. 5, the test system 10 may optionally further include an isolation module 52, and the isolation module 52 may be electrically connected between the control module 120 and the control terminal of the switch module 111, according to some embodiments of the application. For example, in some examples, one end of isolation module 52 may connect multi-channel selection circuit 21 and single-channel selection circuit 22 in parallel, and the other end of isolation module 52 may connect drive module 51.

In some high voltage test items (such as insulation and voltage withstand test), the voltage across the first end of the switch module 111 and the second end of the switch module 111 may be as high as several kilovolts, so that the addition of the isolation module 52 may ensure electrical safety in view of electrical isolation.

The application is not limited in the type of isolation module 52, for example in some specific examples, isolation module 52 may include a photo coupler.

Fig. 6 is a schematic circuit diagram of a test system according to an embodiment of the present application. As shown in fig. 6, the test system 10 may optionally include a first main line L1 and a second main line L2, and the switch module 111 may include a first switch module 61 and a second switch module 62, according to some embodiments of the present application. The control terminal of the first switch module 61 and the control terminal of the second switch module 62 may be electrically connected to the control module 120. The first main line L1 may be also referred to as a positive main line, and the second main line L2 may be also referred to as a negative main line, for example.

The first connection terminal of the sensing device 100 may be electrically connected to the first main line L1, and the second connection terminal of the sensing device 100 may be electrically connected to the second main line L2. Illustratively, the first connection of the detection device 100 may be a positive connection of the detection device 100 and the second connection of the detection device 100 may be a negative connection of the detection device 100.

A first end of the first switch module 61 may be electrically connected to the first main line L1, and a second end of the first switch module 61 may be used to electrically connect to an interface of the battery pack to be tested.

A first end of the second switch module 62 may be electrically connected to the second main line L2, and a second end of the second switch module 62 may be used to electrically connect to an interface of the battery pack to be tested.

As shown in fig. 6, according to some embodiments of the present application, the test system 10 may optionally further include a plurality of first interfaces P1, and the plurality of first interfaces P1 may be used for electrically connecting with a plurality of interfaces of the battery pack to be tested in a one-to-one correspondence.

Each first interface P1 may be electrically connected to a second terminal of one first switch module 61 and a second terminal of one second switch module 62, respectively. That is, each of the first interfaces P1 may be electrically connected to the first main line L1 through the first switch module 61, and may also be electrically connected to the second main line L2 through the second switch module 62.

Fig. 7 is a schematic circuit diagram of a test system according to an embodiment of the present application. As shown in fig. 7, the inspection apparatus 100 may optionally include a plurality of inspection instruments 70, and the plurality of inspection instruments 70 may be connected in parallel to the first main line L1 and the second main line L2, according to some embodiments of the present application. For example, a first connection end of each of the sensing instruments 70 may be electrically connected to the first main line L1, and a second connection end of each of the sensing instruments 70 may be electrically connected to the second main line L2.

The type of at least two test instruments 70 may be different, i.e. at least two test instruments 70 may be used for testing of different test items.

In this way, the detecting device 100 includes a plurality of detecting instruments 70, which is beneficial to testing a plurality of test items of the battery pack to be tested, and meets different testing requirements.

As shown in fig. 7, the test system 10 may optionally further include a third switch module 73, a fourth switch module 74, a fifth switch module 75, and a sixth switch module 76, according to some embodiments of the application.

The first connection terminal of the detecting instrument 70 may be electrically connected to the first main line L1 through the third switch module 73, and the second connection terminal of the detecting instrument 70 may be electrically connected to the second main line L2 through the fourth switch module 74. Illustratively, the first connection of the detecting instrument 70 may be a positive connection of the detecting instrument 70, and the second connection of the detecting instrument 70 may be a negative connection of the detecting instrument 70.

It should be noted that in some examples, the test system 10 may include a plurality of test instruments 70. Accordingly, the test system 10 may include a plurality of third switch modules 73 and a plurality of fourth switch modules 74. The first connection terminal of each of the sensing instruments 70 may be electrically connected to the first main line L1 through a third switching module 73, and the second connection terminal of each of the sensing instruments 70 may be electrically connected to the second main line L2 through a fourth switching module 74.

A first end of the fifth switch module 75 may be electrically connected to the first main line L1, and a second end of the fifth switch module 75 may be used to be electrically connected to the case of the battery pack to be tested.

A first end of the sixth switch module 76 may be electrically connected to the second main line L2, and a second end of the sixth switch module 76 may be used to electrically connect to the housing of the battery pack to be tested.

For example, in some examples, the test system 10 may include a connection terminal P2, and the second terminal of the fifth switch module 75 and the second terminal of the sixth switch module 76 may be electrically connected to the connection terminal P2, and the connection terminal P2 may be used to electrically connect to the housing of the battery pack under test.

In this way, by providing the fifth switch module 75 and the sixth switch module 76 for electrical connection with the housing of the battery pack to be tested, it is possible to realize tests of the resistance values of some interfaces of the battery pack to be tested with respect to the housing of the battery pack to be tested, such as short circuit detection and withstand voltage test.

According to some embodiments of the present application, the plurality of detection instruments 70 may optionally include at least one of an insulation voltage withstand instrument, a voltage and resistance value acquisition device, an equipotential tester, an oscilloscope, a programmable power supply, a trigger signal generation device, and a rotational-change device. The voltage and resistance acquisition device may include a multimeter, and the trigger signal generation device may include a pulse width modulation (Pulse Width Modulation, PWM) generator.

The insulation voltage tester can be used for insulation voltage test of the battery pack to be tested. The voltage and resistance acquisition device can be used for detecting the output voltage of the battery pack to be detected, detecting the resistance of some interfaces of the battery pack to be detected relative to the shell of the battery pack to be detected, and the like. The equipotential tester can be used for equipotential (or equipotential) testing of the battery pack to be tested. In order to improve the safety of the battery pack, it is generally required that the electric potentials of different positions of the battery pack are the same, i.e., the electric potential difference between any two positions of the battery pack is smaller or the electric potential difference is 0. The equipotential test may be used, for example, to detect the potential difference between any two locations of the battery pack under test.

The oscilloscope can be used for detecting the waveform of the output signal of the battery pack to be tested. The programmable power supply can be used for providing electric energy for the battery pack to be tested, detecting the current of the battery pack to be tested and verifying the operation of the system and the stability of the electrical components. The trigger signal generating device may be used to provide an external trigger signal to the battery pack under test. For example, in some examples, the trigger signal generating device may generate an external trigger signal that simulates airbag ejection and send the external trigger signal to the battery pack under test, and then the test system 10 may detect the presence or absence of a high voltage down action of the battery pack under test. And the BMS in the battery pack to be tested controls the main loop relay in the battery pack to be tested to be disconnected under the condition of high voltage.

The rotation device can be used for generating data such as the rotating speed and/or the angle of the motor, and then sending the data such as the rotating speed and/or the angle of the motor to the battery pack to be tested, for example, the rotation device can be used for detecting whether a Motor Controller (MCU) in the battery pack to be tested can normally operate.

Optionally, according to some embodiments of the present application, the test system 10 may further include a power source, which may power the test system 10. Illustratively, the power source may include a direct current power source.

Optionally, according to some embodiments of the present application, the test system 10 may further include a controller area network (Controller Area Network, CAN) communication module. The CAN communication module may include a plurality of first communication interfaces, which may be respectively used to electrically connect with a plurality of second communication interfaces of the battery pack to be tested and/or other components of the vehicle, so as to implement communication between the test system 10 and the battery pack to be tested and/or other components of the vehicle.

Fig. 8 is a schematic circuit diagram of a test system according to an embodiment of the present application. For simplicity of illustration, the control module 120 and its partial circuits/modules, etc. connected to the control module 120 are not shown in fig. 8, and the switching units and switching elements in fig. 8 are shown in simplified drawing. As shown in fig. 8, the plurality of first interfaces P1 optionally includes a three-phase electrical interface 81, a first voltage interface 82, a second voltage interface 83, and a target direct current interface 84, according to some embodiments of the application. It will be appreciated that the three-phase electrical interface 81 may be used for electrically connecting with a three-phase electrical connection interface corresponding to a battery pack to be tested, the first voltage interface 82 may be used for electrically connecting with a first voltage connection interface corresponding to a battery pack to be tested, the second voltage interface 83 may be used for electrically connecting with a second voltage connection interface corresponding to a battery pack to be tested, and the target dc electrical interface 84 may be used for electrically connecting with a target dc electrical connection interface corresponding to a battery pack to be tested.

For example, the first voltage interface 82 may include a 220V voltage interface, i.e., a Vehicle to Load (V2L) interface. The second voltage interface 83 may include a low voltage interface, such as a 12V voltage interface. The target dc interface 84 may include a dc charging interface and/or a dc discharging interface, etc.

In some examples, the test system 10 may include one or more first voltage interfaces 82 and the test system 10 may include one or more target direct current interfaces 84. Fig. 8 illustrates an example of a test system 10 including two first voltage interfaces 82 and n target dc interfaces 84, n being a positive integer.

The three-phase electrical interface 81 may include a first phase electrical interface U, a second phase electrical interface V, and a third phase electrical interface W, the first voltage interface 82 may include a first voltage positive interface L and a first voltage negative interface N, and the target direct current interface 84 may include a direct current positive interface Pi and a direct current negative interface Ni. The dc positive interface Pi represents the dc positive interface of the ith target dc interface 84, and the dc negative interface Ni represents the dc negative interface of the ith target dc interface 84, i is greater than or equal to 1 and less than or equal to n.

The first switching module 61 may include a first switching unit K1, a third switching unit K3, a fifth switching unit K5, a seventh switching unit K7, a ninth switching unit K9, an eleventh switching unit K11, a thirteenth switching unit K13, and a fifteenth switching unit K15.

The second switching module 62 may include a second switching unit K2, a fourth switching unit K4, a sixth switching unit K6, an eighth switching unit K8, a tenth switching unit K10, a twelfth switching unit K12, a fourteenth switching unit K14, and a sixteenth switching unit K16.

The first phase electrical interface U is electrically connected to the first main line L1 through the first switching unit K1, and the first phase electrical interface U is electrically connected to the second main line L2 through the second switching unit K2.

The second phase electrical interface V is electrically connected to the first main line L1 through the third switching unit K3, and the second phase electrical interface V is electrically connected to the second main line L2 through the fourth switching unit K4.

The third electrical interface W is electrically connected to the first main line L1 through the fifth switching unit K5, and the third electrical interface W is electrically connected to the second main line L2 through the sixth switching unit K6.

The first voltage positive electrode interface L is electrically connected with the first main line L1 through a seventh switch unit K7, and the first voltage positive electrode interface L is electrically connected with the second main line L2 through an eighth switch unit K8.

The first voltage negative electrode interface N is electrically connected to the first main line L1 through a ninth switching unit K9, and the first voltage negative electrode interface N is electrically connected to the second main line L2 through a tenth switching unit K10.

The second voltage interface 83 is electrically connected to the first main line L1 through the eleventh switching unit K11, and the second voltage interface 83 is electrically connected to the second main line L2 through the twelfth switching unit K12.

The dc positive electrode interface P1 is electrically connected to the first main line L1 through a thirteenth switching unit K13, and the dc positive electrode interface P1 is electrically connected to the second main line L2 through a fourteenth switching unit K14.

The dc negative electrode interface N1 is electrically connected to the first main line L1 through a fifteenth switching unit K15, and the dc negative electrode interface N1 is electrically connected to the second main line L2 through a sixteenth switching unit K16.

Fig. 8 shows an example in which the inspection apparatus 100 includes a multimeter 85, a dielectric withstand voltage meter 86, and an equipotential tester 87, and in other embodiments, the inspection apparatus 100 may further include other inspection instruments. The third switching module 73 may include first, third and fifth switching members KJ1, KJ3 and KJ5, and the fourth switching module 74 may include second, fourth and sixth switching members KJ2, KJ4 and KJ6.

A first connection end of multimeter 85 can be electrically connected to first main line L1 via first switch element KJ1, and a second connection end of multimeter 85 can be electrically connected to second main line L2 via second switch element KJ 2. The first connection end of the insulation and voltage resistance meter 86 may be electrically connected to the first main line L1 through the third switching element KJ3, and the second connection end of the insulation and voltage resistance meter 86 may be electrically connected to the second main line L2 through the fourth switching element KJ 4. The first connection end of the equipotential tester 87 may be electrically connected to the first main line L1 through the fifth switching element KJ5, and the second connection end of the equipotential tester 87 may be electrically connected to the second main line L2 through the sixth switching element KJ 6.

A first end of the fifth switch module 75 may be electrically connected to the first main line L1, a second end of the fifth switch module 75 may be electrically connected to the connection terminal P2, and the connection terminal P2 may be used to be electrically connected to the housing of the battery pack to be tested.

A first end of the sixth switch module 76 may be electrically connected to the second main line L2, and a second end of the sixth switch module 76 may be electrically connected to the connection terminal P2.

Fig. 9 is a schematic diagram of a test flow of a test system according to an embodiment of the present application. As shown in fig. 9, the testing process of the testing system may optionally include the following steps S901 to S905 according to some embodiments of the present application.

S901, short circuit detection.

In conjunction with fig. 8, in the short circuit detection stage, the switch module connected to the three-phase electrical interface 81 and the first voltage interface 82 may be controlled to be turned on, and the resistance value of the first target interface of the battery pack to be detected relative to the reference end may be detected, where the first target interface may include an interface connected to the three-phase electrical interface in the battery pack to be detected and an interface connected to the first voltage interface in the battery pack to be detected. Wherein, the reference terminal can comprise the shell of the battery pack to be tested. The resistance of the first target interface with respect to the reference terminal may be the resistances of the three-phase electrical interface 81 and the first voltage interface 82 with respect to the reference terminal.

Specifically, in the short circuit detection stage, the first switch unit K1, the third switch unit K3, the fifth switch unit K5, the seventh switch unit K7, and the sixth switch module 76 may be controlled to be turned on, and the resistance values of the first phase electrical interface U, the second phase electrical interface V, the third phase electrical interface W, and the first voltage positive electrode interface L with respect to the case of the battery pack to be tested may be detected.

In the short circuit detection stage, the first switch part KJ1 and the second switch part KJ2 may be turned on, and resistance values of the first phase electrical interface U, the second phase electrical interface V, the third phase electrical interface W, and the first voltage positive electrode interface L relative to the housing of the battery pack to be tested are detected by the multimeter 85. Or the third switching element KJ3 and the fourth switching element KJ4 may be turned on, and the resistance values of the first phase electrical interface U, the second phase electrical interface V, the third phase electrical interface W, and the first voltage positive electrode interface L with respect to the housing of the battery pack to be tested are detected by the insulation voltage withstand meter 86.

In the short circuit detection stage, the battery pack to be detected can be subjected to high voltage, namely, a main loop relay (such as a main negative relay and a pre-charging relay) and a charging relay in the battery pack to be detected can be disconnected. In the short detection phase, it is possible to switch to the multi-channel selection circuit 21 as shown in fig. 2, thereby controlling the plurality of switching units to be turned on.

S902, insulation withstand voltage test.

In connection with fig. 8, in the insulation and voltage withstand test stage, the switch module connected to the three-phase electrical interface 81 and the first voltage interface 82 may be controlled to be turned on, voltage signals of a first voltage value are provided to the three-phase electrical interface 81 and the first voltage interface 82, and a resistance value of a first target interface of the battery pack to be tested relative to the reference terminal is detected, where the first target interface includes an interface connected to the three-phase electrical interface 81 in the battery pack to be tested and an interface connected to the first voltage interface 82 in the battery pack to be tested. Wherein, the reference terminal can comprise the shell of the battery pack to be tested. The resistance of the first target interface with respect to the reference terminal may be the resistances of the three-phase electrical interface 81 and the first voltage interface 82 with respect to the reference terminal. The voltage signal of the first voltage value can be a high-voltage signal, and the magnitude of the first voltage value can be flexibly adjusted according to practical conditions, which is not limited by the application. For example, in some examples, the first voltage value may be 1000 volts.

Specifically, in the insulation and voltage withstand test stage, the third switching element KJ3, the fourth switching element KJ4, the first switching unit K1, the third switching unit K3, the fifth switching unit K5, the seventh switching unit K7, and the sixth switching module 76 may be controlled to be turned on, voltage signals of the first voltage value are provided to the first phase electrical interface U, the second phase electrical interface V, the third phase electrical interface W, and the first voltage positive electrode interface L through the insulation and voltage withstand meter 86, and the resistance values of the first phase electrical interface U, the second phase electrical interface V, the third phase electrical interface W, and the first voltage positive electrode interface L with respect to the case of the battery pack to be tested are detected through the insulation and voltage withstand meter 86.

In the insulation voltage-withstanding test stage, the battery pack to be tested can be subjected to high voltage, namely, a main loop relay (such as a main negative relay and a pre-charging relay) and a charging relay in the battery pack to be tested can be disconnected. In the short detection phase, it is possible to switch to the multi-channel selection circuit 21 as shown in fig. 2, thereby controlling the plurality of switching units to be turned on.

S903, direct current positive loop insulation test.

In conjunction with fig. 8, in the stage of insulation test of the dc positive circuit, the switch module connected to the dc positive interface P1 may be controlled to be turned on, a voltage signal with a first voltage value is provided to the dc positive interface P1, and a resistance value of a second target interface of the battery pack to be tested relative to the reference end is detected, where the second target interface may include an interface connected to the dc positive interface in the battery pack to be tested. Wherein, the reference terminal can comprise the shell of the battery pack to be tested. The resistance of the second target interface with respect to the reference terminal may be the resistance of the dc positive electrode interface P1 with respect to the reference terminal. The voltage signal of the first voltage value can be a high-voltage signal, and the magnitude of the first voltage value can be flexibly adjusted according to practical conditions, which is not limited by the application. For example, in some examples, the first voltage value may be 1000 volts.

Specifically, during the direct current positive loop insulation test phase, the battery pack to be tested may be at a high voltage, i.e., the main loop relay (e.g., the main negative relay and the pre-charge relay) and the charging relay in the battery pack to be tested may be closed. During the dc positive loop insulation test phase, it is possible to switch to the single channel selection circuit 22 shown in fig. 2, thereby achieving interlocking between the switching elements.

For example, in the direct current positive loop insulation test stage, switching to the single channel selection circuit 22 shown in fig. 2 may control the thirteenth switching unit K13 to be turned on, and other switching units other than the thirteenth switching unit K13 among the first and second switching modules 61 and 62 may be turned off. The third switching element KJ3, the fourth switching element KJ4 and the sixth switching module 76 are turned on, a voltage signal of a first voltage value is provided to the direct current positive electrode interface P1 through the insulation voltage withstand meter 86, and the resistance value of the direct current positive electrode interface P1 relative to the shell of the battery pack to be tested is detected through the insulation voltage withstand meter 86. The detection method of other dc positive interfaces is similar to the detection method of the dc positive interface P1, and will not be described here again.

S904, DC negative loop insulation test.

In connection with fig. 8, in the stage of insulation test of the dc negative circuit, the switch module connected to the dc negative interface N1 may be controlled to be turned on, a voltage signal with a first voltage value is provided to the dc negative interface N1, and a resistance value of a third target interface of the battery pack to be tested relative to the reference end is detected, where the third target interface includes an interface connected to the dc negative interface N1 in the battery pack to be tested. Wherein, the reference terminal can comprise the shell of the battery pack to be tested. The resistance value of the third target interface relative to the reference end can be the resistance value of the direct current negative electrode interface N1 relative to the reference end. The voltage signal of the first voltage value can be a high-voltage signal, and the magnitude of the first voltage value can be flexibly adjusted according to practical conditions, which is not limited by the application. For example, in some examples, the first voltage value may be 1000 volts.

Specifically, during the dc negative loop insulation test phase, the battery pack to be tested may be high-voltage, i.e., the main loop relay (e.g., the main negative relay and the pre-charge relay) and the charging relay in the battery pack to be tested may be closed. During the dc negative loop insulation test phase, it is possible to switch to the single channel selection circuit 22 shown in fig. 2, thereby achieving interlocking between the switching elements.

For example, in the dc negative loop insulation test stage, switching to the single channel selection circuit 22 shown in fig. 2 may control the fourteenth switching unit K14 to be turned on, and other switching units except for the fourteenth switching unit K14 in the first switching module 61 and the second switching module 62 may be turned off. The third switching element KJ3, the fourth switching element KJ4 and the sixth switching module 76 are turned on, a voltage signal of a first voltage value is provided to the dc negative electrode interface N1 through the insulation voltage withstand meter 86, and the resistance value of the dc negative electrode interface N1 relative to the housing of the battery pack to be tested is detected through the insulation voltage withstand meter 86. The detection manner of the other dc negative electrode interfaces is similar to that of the dc negative electrode interface N1, and will not be described here again.

S905, testing output voltage.

In some embodiments, the output voltage testing phase may include at least one of a three-phase electrical phase voltage testing phase, a second voltage output voltage testing phase, and a first voltage output voltage testing phase.

Referring to fig. 8, in the phase of testing the voltage between the three phases of electricity, the switch module connected to any two phases of electricity in the three-phase electricity interface 81 can be controlled to be turned on, and the voltage between any two phases of electricity interfaces can be detected.

Specifically, in the three-phase electric inter-phase voltage test phase, the first switching unit K1 and the second switching unit K2 may be interlocked, the third switching unit K3 and the fourth switching unit K4 may be interlocked, the fifth switching unit K5 and the sixth switching unit K6 may be interlocked, the first switching unit K1, the third switching unit K3 and the fifth switching unit K5 may be interlocked, and the second switching unit K2, the fourth switching unit K4 and the sixth switching unit K6 may be interlocked. Wherein, two switch unit interlocks and means that only one switch unit in two switch units switches on, and three switch unit interlocks and means that only one switch unit in three switch units switches on.

In the three-phase electrical inter-phase voltage testing phase, the first switch piece KJ1 and the second switch piece KJ2 can be turned on, and the voltage between any two-phase electrical interfaces is detected through the multimeter 85.

First, the first switching unit K1 and the fourth switching unit K4 may be controlled to be turned on, and a voltage between the first phase electrical interface U and the second phase electrical interface V may be detected. Then, the first switching unit K1 and the fourth switching unit K4 may be controlled to be turned off, the first switching unit K1 and the sixth switching unit K6 may be controlled to be turned on, and the voltage between the first phase electrical interface U and the third phase electrical interface W may be detected. Then, the first switching unit K1 and the sixth switching unit K6 are controlled to be turned off, the third switching unit K3 and the sixth switching unit K6 are controlled to be turned on, and the voltage between the second electrical interface V and the third electrical interface W is detected. Then, the third and sixth switching units K3 and K6 are turned off.

In the second voltage output voltage testing stage, the switch module connected to the second voltage interface 83 may be controlled to be turned on, and the voltage of the second voltage interface 83 is detected.

Specifically, in the second voltage output voltage test phase, the eleventh and twelfth switching units K11 and K12 may be interlocked, and the fifth and sixth switching modules 75 and 76 may be interlocked. The eleventh switching unit K11 and the sixth switching module 76 may be controlled to be turned on. The first and second switching members KJ1 and KJ2 may be turned on, and the voltage of the second voltage interface 83 may be detected by the multimeter 85.

In the first voltage output voltage testing stage, the switch module connected with the first voltage interface 82 is controlled to be turned on, and the voltage of the first voltage interface 82 is detected.

Specifically, in the first voltage output voltage test stage, the seventh switching unit K7 and the eighth switching unit K8 may be interlocked, and the ninth switching unit K9 and the tenth switching unit K10 may be interlocked. The seventh switching unit K7 and the tenth switching unit K10 may be controlled to be turned on, and the first switching member KJ1 and the second switching member KJ2 may be controlled to be turned on, and the voltage between the first voltage positive electrode interface L and the first voltage negative electrode interface N may be detected by the multimeter 85.

Note that in some examples, S902 may be performed after S901 detects that the compliance is satisfied. S903 may be performed after detecting compliance in S902. S904 may be performed after detecting compliance in S903. S905 may be performed after detecting compliance in S904. Of course, the sequence between S901 to S905 may be flexibly adjusted, which is not limited by the present application.

According to some embodiments of the application, the switch module 111 may optionally include a relay, and the switch circuit 110 may be disposed on a circuit board. Therefore, the circuit board on which the switching circuit 110 is located may be referred to as a relay circuit board.

According to some embodiments of the present application, optionally, the test system 10 may be used to perform, for example, an equipotential test, a CAN communication test, a pull-up and pull-down resistance measurement, an analog temperature test, a PWM test, and/or PWM signal acquisition, etc., in addition to the test shown in fig. 9.

According to some embodiments of the present application, optionally, the test system 10 may further include a code scanning device, for example, the code scanning device is configured to scan an identification code (such as a two-dimensional code or a bar code) on the battery pack to be tested, so as to determine a type of the battery pack to be tested according to the identification code, and perform a test corresponding to the type of the battery pack to be tested to implement automatic code scanning and automatic test. Moreover, the test data may be saved after the test is completed.

According to some embodiments of the present application, the test system 10 may optionally be further configured to output an alarm message when detecting that the battery pack to be tested does not meet the preset requirement, i.e., the test of the battery pack to be tested fails.

Based on the test system 10 provided in the above embodiment, correspondingly, the application further provides a specific implementation manner of the test method. The test method may be applied to the test system 10 provided in the above embodiment. Please refer to the following examples.

Fig. 10 is a schematic flow chart of a test method according to an embodiment of the present application. As shown in fig. 10, the test method provided by the embodiment of the application may include the following steps:

S1001, in a testing stage, controlling the on-off states of a plurality of switch modules, and testing the battery pack to be tested.

According to the test system provided by the embodiment of the application, the on-off states of the switch modules are controlled, so that the electrical connection between the detection equipment and different interfaces of the battery pack to be tested can be switched, the test of a plurality of different test items can be realized, automatic switching can be realized, manual switching and circuit connection are not needed, the test efficiency of the test system is improved, and the probability of circuit connection errors is reduced.

According to some embodiments of the application, optionally, the test system includes a plurality of first interfaces, and the plurality of first interfaces are used for electrically connecting with the plurality of interfaces of the battery pack to be tested in a one-to-one correspondence manner. The plurality of first interfaces includes a three-phase electrical interface, a first voltage interface, a second voltage interface, and a target direct current interface. The three-phase electric interface comprises a first phase electric interface, a second phase electric interface and a third phase electric interface, the first voltage interface comprises a first voltage positive electrode interface and a first voltage negative electrode interface, and the target direct current interface comprises a direct current positive electrode interface and a direct current negative electrode interface.

According to some embodiments of the present application, optionally, in the testing stage, S1001, the on-off states of the plurality of switch modules are controlled, and the battery pack to be tested is tested, which may include the following steps:

In the short circuit detection stage, a switch module connected with the three-phase electric interface and the first voltage interface is controlled to be conducted, the resistance value of a first target interface of the battery pack to be detected relative to a reference end is detected, and the first target interface comprises an interface connected with the three-phase electric interface in the battery pack to be detected and an interface connected with the first voltage interface in the battery pack to be detected.

In the insulation voltage-withstanding test stage, a switch module connected with the three-phase electric interface and the first voltage interface is controlled to be conducted, a voltage signal with a first voltage value is provided for the three-phase electric interface and the first voltage interface, the resistance value of a first target interface of a battery pack to be tested relative to a reference end is detected, and the first target interface comprises an interface connected with the three-phase electric interface in the battery pack to be tested and an interface connected with the first voltage interface in the battery pack to be tested.

In the insulation test stage of the direct current positive loop, a switch module connected with a direct current positive electrode interface is controlled to be conducted, a voltage signal with a first voltage value is provided for the direct current positive electrode interface, the resistance value of a second target interface of the battery pack to be tested relative to a reference end is detected, and the second target interface comprises an interface connected with the direct current positive electrode interface in the battery pack to be tested;

in the insulation test stage of the direct current negative circuit, a switch module connected with a direct current negative electrode interface is controlled to be conducted, a voltage signal with a first voltage value is provided for the direct current negative electrode interface, the resistance value of a third target interface of the battery pack to be tested relative to a reference end is detected, and the third target interface comprises an interface connected with the direct current negative electrode interface in the battery pack to be tested.

According to some embodiments of the application, optionally, the test phase comprises an output voltage test phase comprising at least one of a three-phase electrical phase-to-phase voltage test phase, a second voltage output voltage test phase, and a first voltage output voltage test phase;

s1001, in a testing stage, controlling the on-off states of a plurality of switch modules, and testing a battery pack to be tested, wherein the method can comprise the following steps:

in the phase of testing the voltage between the three-phase electric phases, the switching module connected with any two-phase electric interfaces in the three-phase electric interfaces is controlled to be conducted, and the voltage between any two-phase electric interfaces is detected;

In a second voltage output voltage testing stage, controlling a switch module connected with a second voltage interface to be conducted, and detecting the voltage of the second voltage interface;

and in the first voltage output voltage testing stage, controlling the switch module connected with the first voltage interface to be conducted, and detecting the voltage of the first voltage interface.

The specific process of each test stage is described in detail above and will not be repeated here. The specific processes of each step of the testing method in the above method embodiment are described in detail above, and are not repeated here.

It should be understood that the specific structures of the circuits provided in the drawings of the embodiments of the present application are only examples and are not intended to limit the present application. In addition, the above embodiments provided by the present application may be combined with each other without contradiction.

It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. These embodiments are not exhaustive of all details, nor are they intended to limit the application to the precise embodiments disclosed, in accordance with the application. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best utilize the application and various modifications as are suited to the particular use contemplated. The application is limited only by the claims and the full scope and equivalents thereof.

Those skilled in the art will appreciate that the above-described embodiments are exemplary and not limiting. The different technical features presented in the different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in view of the drawings, the description, and the claims. In the claims, the term "comprising" does not exclude other structures; the amounts refer to "a" and do not exclude a plurality; the terms "first," "second," and the like, are used for designating a name and not for indicating any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The presence of certain features in different dependent claims does not imply that these features cannot be combined to advantage.

Claims

1. A test system, comprising:

a detection device;

the switch circuit comprises a plurality of switch modules, wherein first ends of the switch modules are electrically connected with the detection equipment, and second ends of the switch modules are used for being electrically connected with a plurality of interfaces of the battery pack to be detected;

the control module is electrically connected with the control ends of the switch modules and is used for controlling the on-off states of the switch modules;

The test system also comprises a multi-channel selection circuit, a single-channel selection circuit and a switching module;

The control module is electrically connected with the multi-channel selection circuit and the single-channel selection circuit which are connected in parallel through the switching module, and the multi-channel selection circuit and the single-channel selection circuit which are connected in parallel are electrically connected with the control end of the switching module;

The multichannel selection circuit comprises a plurality of first switching devices connected in parallel, and the first switching devices are electrically connected with control ends of the switch modules in a one-to-one correspondence manner;

The control module controls at least two switch modules to be conducted through at least two conducted first switch devices;

the single-channel selection circuit comprises a plurality of second switching devices connected in parallel, and the second switching devices are electrically connected with the control ends of the switch modules in a one-to-one correspondence manner;

The control module controls one of the switch modules to be conducted through one of the conducted second switch devices;

the switching module comprises a third switching device and a fourth switching device;

The control module is electrically connected with the multi-channel selection circuit through the third switching device, and is electrically connected with the single-channel selection circuit through the fourth switching device.

2. The test system of claim 1, further comprising a drive module electrically connected between the control module and the control terminal of the switch module.

3. The test system of claim 1, further comprising an isolation module electrically connected between the control module and the control terminal of the switch module.

4. The test system of claim 1, wherein the test system comprises a first main line and a second main line, and the switch module comprises a first switch module and a second switch module;

the first connecting end of the detection equipment is electrically connected with the first main line, and the second connecting end of the detection equipment is electrically connected with the second main line;

The first end of the first switch module is electrically connected with the first main line, and the second end of the first switch module is used for being electrically connected with the interface of the battery pack to be tested;

The first end of the second switch module is electrically connected with the second main line, and the second end of the second switch module is used for being electrically connected with the interface of the battery pack to be tested.

5. The test system of claim 4, further comprising a plurality of first interfaces for one-to-one electrical connection with the plurality of interfaces of the battery pack under test;

Each first interface is electrically connected with a second end of one first switch module and a second end of one second switch module respectively.

6. The test system of claim 4, wherein the detection device comprises a plurality of detection instruments connected in parallel to the first main line and the second main line.

7. The test system of claim 6, further comprising a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module;

The first connecting end of the detecting instrument is electrically connected with the first main line through the third switch module, and the second connecting end of the detecting instrument is electrically connected with the second main line through the fourth switch module;

The first end of the fifth switch module is electrically connected with the first main line, and the second end of the fifth switch module is used for being electrically connected with the shell of the battery pack to be tested;

The first end of the sixth switch module is electrically connected with the second main line, and the second end of the sixth switch module is used for being electrically connected with the shell of the battery pack to be tested.

8. The test system of claim 6, wherein the plurality of detection instruments comprises at least one of an insulation voltage tester, a voltage and resistance acquisition device, an equipotential tester, an oscilloscope, a programmable power supply, a trigger signal generation device, and a rotational-change device.

9. The test system of claim 5, wherein the plurality of first interfaces comprises a three-phase electrical interface, a first voltage interface, a second voltage interface, and a target direct current interface;

The three-phase electric interface comprises a first phase electric interface, a second phase electric interface and a third phase electric interface, the first voltage interface comprises a first voltage positive electrode interface and a first voltage negative electrode interface, and the target direct current interface comprises a direct current positive electrode interface and a direct current negative electrode interface;

The first switch module comprises a first switch unit, a third switch unit, a fifth switch unit, a seventh switch unit, a ninth switch unit, an eleventh switch unit, a thirteenth switch unit and a fifteenth switch unit;

the second switch module comprises a second switch unit, a fourth switch unit, a sixth switch unit, an eighth switch unit, a tenth switch unit, a twelfth switch unit, a fourteenth switch unit and a sixteenth switch unit;

the first phase electric interface is electrically connected with the first main line through the first switch unit, and the first phase electric interface is electrically connected with the second main line through the second switch unit;

the second phase electric interface is electrically connected with the first main line through the third switch unit, and the second phase electric interface is electrically connected with the second main line through the fourth switch unit;

The third electric interface is electrically connected with the first main line through the fifth switch unit, and the third electric interface is electrically connected with the second main line through the sixth switch unit;

The first voltage positive electrode interface is electrically connected with the first main line through the seventh switch unit, and the first voltage positive electrode interface is electrically connected with the second main line through the eighth switch unit;

The first voltage negative electrode interface is electrically connected with the first main line through the ninth switch unit, and the first voltage negative electrode interface is electrically connected with the second main line through the tenth switch unit;

The second voltage interface is electrically connected with the first main line through the eleventh switch unit, and the second voltage interface is electrically connected with the second main line through the twelfth switch unit;

The direct current positive electrode interface is electrically connected with the first main line through the thirteenth switch unit, and the direct current positive electrode interface is electrically connected with the second main line through the fourteenth switch unit;

the direct current negative electrode interface is electrically connected with the first main line through the fifteenth switch unit, and the direct current negative electrode interface is electrically connected with the second main line through the sixteenth switch unit.

10. The test system of claim 1, wherein the switch module comprises a relay and the switch circuit is disposed on a circuit board.

11. A test method applied to the test system according to any one of claims 1 to 10, the test method comprising:

and in the testing stage, controlling the on-off states of the switch modules, and testing the battery pack to be tested.

12. The test method of claim 11, wherein the test system comprises a test system further comprising a plurality of first interfaces for one-to-one electrical connection with the plurality of interfaces of the battery pack under test;

The plurality of first interfaces comprise a three-phase electrical interface, a first voltage interface, a second voltage interface and a target direct current interface;

The three-phase electric interface comprises a first phase electric interface, a second phase electric interface and a third phase electric interface, the first voltage interface comprises a first voltage positive electrode interface and a first voltage negative electrode interface, and the target direct current interface comprises a direct current positive electrode interface and a direct current negative electrode interface.

13. The method according to claim 12, wherein during the testing phase, controlling the on-off states of the plurality of switch modules, and testing the battery pack to be tested includes:

and in a short circuit detection stage, controlling the switch module connected with the three-phase electric interface and the first voltage interface to be conducted, and detecting the resistance value of a first target interface of the battery pack to be detected relative to a reference end, wherein the first target interface comprises an interface connected with the three-phase electric interface in the battery pack to be detected and an interface connected with the first voltage interface in the battery pack to be detected.

14. The testing method according to claim 12 or 13, wherein during the testing phase, controlling the on-off states of the plurality of switch modules, the testing the battery pack to be tested includes:

In an insulation voltage-withstanding test stage, controlling the switch module connected with the three-phase electric interface and the first voltage interface to be conducted, providing voltage signals with a first voltage value for the three-phase electric interface and the first voltage interface, and detecting the resistance value of a first target interface of a battery pack to be tested relative to a reference end, wherein the first target interface comprises an interface connected with the three-phase electric interface in the battery pack to be tested and an interface connected with the first voltage interface in the battery pack to be tested.

15. The testing method according to claim 12 or 13, wherein during the testing phase, controlling the on-off states of the plurality of switch modules, the testing the battery pack to be tested includes:

In a DC positive loop insulation test stage, controlling the switch module connected with the DC positive interface to be conducted, providing a voltage signal with a first voltage value for the DC positive interface, and detecting the resistance value of a second target interface of a battery pack to be tested relative to a reference end, wherein the second target interface comprises an interface connected with the DC positive interface in the battery pack to be tested;

and in the insulation test stage of the direct current negative circuit, controlling the switch module connected with the direct current negative electrode interface to be conducted, providing a voltage signal with a first voltage value for the direct current negative electrode interface, and detecting the resistance value of a third target interface of the battery pack to be tested relative to a reference end, wherein the third target interface comprises an interface connected with the direct current negative electrode interface in the battery pack to be tested.

16. The test method according to claim 12 or 13, wherein the test phase comprises an output voltage test phase comprising at least one of a three-phase electrical phase-to-phase voltage test phase, a second voltage output voltage test phase and a first voltage output voltage test phase;

And in the testing stage, controlling the on-off states of the switch modules, and testing the battery pack to be tested, wherein the testing stage comprises the following steps:

In the phase voltage testing stage of the three-phase electric interfaces, controlling the switch module connected with any two-phase electric interfaces in the three-phase electric interfaces to be conducted, and detecting the voltage between any two-phase electric interfaces;

In the second voltage output voltage testing stage, controlling a switch module connected with the second voltage interface to be conducted, and detecting the voltage of the second voltage interface;