A multimeter test module and method for battery pack testing

Abstract

The present specification provides a multimeter detection module and method for battery pack testing, comprising: a shell; an integrated circuit board inside the shell; a first interface on the surface of the shell for connecting a multimeter; a plurality of second interfaces on the surface of the shell, each second interface serving as a multimeter connection channel; the first interface, the second interface and the integrated circuit board are electrically connected; a battery pack shell interface on the surface of the shell for electrically connecting with the shell of the battery pack; an insulation detection unit electrically connected with the first interface and the battery pack shell interface for insulation detection of the battery pack. The present scheme realizes the connection relationship between various devices through the printed circuit on the integrated circuit board, reducing external wiring; by controlling the opening and closing of the relay, the multiple channels are sequentially connected to the positive and negative terminals of the multimeter, avoiding frequent line changing, meeting the needs of reliable battery pack testing under various working conditions; the leakage detection and insulation detection functions can be realized, and the integration is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy battery testing, in particular to a multimeter detection module and method for battery pack testing. BACKGROUND

[0002] In the process of testing a new energy battery pack, a multimeter is usually needed, and the line connected to the multimeter needs to be changed, especially in the case of automatic testing.

[0003] The prior art multimeter itself has only one channel, so additional components (such as relays, etc.) and a large number of wires need to be added to expand the channel during testing. The wiring is complex and prone to errors. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a multimeter detection module and method for battery pack testing to solve the problem of complex wiring and errors in the prior art.

[0005] The first aspect of the present specification provides a multimeter detection module for battery pack testing, comprising: a housing; an integrated circuit board arranged inside the housing; a first interface arranged on the surface of the housing; the first interface is used to connect a multimeter; a plurality of second interfaces arranged on the surface of the housing; each second interface serves as a channel connected to the multimeter; the first interface, the second interface and the integrated circuit board are electrically connected; a battery pack housing interface arranged on the surface of the housing; the battery pack housing interface is used to electrically connect with the housing of the battery pack; an insulation detection unit electrically connected with the first interface and the battery pack housing interface, used for insulation detection of the battery pack.

[0006] In some embodiments, a controllable switch is connected in series in the line between at least one of the plurality of second interfaces and the first interface.

[0007] In some embodiments, the insulation detection unit comprises: a first sub-unit arranged between the positive electrode connection end of the multimeter and the battery pack housing interface; the first sub-unit comprises a first parallel branch and a second parallel branch, a first resistor and a first controllable switch are arranged in series in the first parallel branch, and a second resistor and a second controllable switch are arranged in series in the second parallel branch; and / or a second sub-unit arranged between the negative electrode connection end of the multimeter and the battery pack housing interface; the second sub-unit comprises a third parallel branch and a fourth parallel branch, a third resistor and a third controllable switch are arranged in series in the third parallel branch, and a fourth resistor and a fourth controllable switch are arranged in series in the fourth parallel branch.

[0008] In some embodiments, the insulation detection unit further comprises a fifth controllable switch, which is located between the first sub-unit and the battery pack shell interface, and is located between the second sub-unit and the battery pack shell interface.

[0009] In some embodiments, the battery pack shell interface is electrically connected with the positive terminal of the multimeter in the first interface, and / or the battery pack shell interface is electrically connected with the negative terminal of the multimeter in the second interface.

[0010] In some embodiments, in the case that the battery pack shell interface is electrically connected with the positive terminal and the negative terminal of the multimeter in the first interface respectively, a sixth controllable switch and a seventh controllable switch are further provided between the battery pack shell interface and the first interface, the sixth controllable switch is used to control whether the battery pack shell interface and the positive terminal of the multimeter are conductive, and the seventh controllable switch is used to control whether the battery pack shell interface and the negative terminal of the multimeter are conductive.

[0011] In some embodiments, one of the plurality of second interfaces is used as a target interface for connecting with the power interface of the battery pack; the multimeter detection module further comprises an eighth controllable switch for controlling whether the positive terminal in the first interface and the positive terminal in the target interface are conductive, and a ninth controllable switch for controlling whether the negative terminal in the first interface and the negative terminal in the target interface are conductive.

[0012] In some embodiments, the multimeter detection module further comprises a controller provided on the integrated circuit board, for controlling the opening and closing states of the controllable switches; a communication interface provided on the surface of the shell; the communication interface is in communication connection with the controller, and is further used for communication connection with the upper computer, to transmit the control signal of the controllable switches sent by the upper computer.

[0013] The second aspect of the present specification provides a battery pack detection method for the multimeter detection module of the first aspect, one of the plurality of second interfaces is used as a target interface; the method comprises the following steps of: conducting leakage detection by the following method: connecting a multimeter at the first interface, connecting the target interface with the power of the battery pack, and connecting the battery pack shell interface with the shell of the battery pack, controlling the circuit between the target interface and the first interface to be conductive; controlling the sixth controllable switch to be closed and the seventh controllable switch to be opened, to measure the voltage or resistance between the shell of the battery pack and the negative terminal of the multimeter; and / or, controlling the seventh controllable switch to be closed and the sixth controllable switch to be opened, to measure the voltage or resistance between the shell of the battery pack and the positive terminal of the multimeter.

[0014] The third aspect of the specification provides a battery pack detection method for the multimeter detection module of the first aspect, the method comprising: performing insulation detection by controlling the eighth controllable switch and the ninth controllable switch to be turned off; controlling the branch in which the first controllable switch is located to be turned on, and controlling the branches in which the second controllable switch, the third controllable switch, and the fourth controllable switch are located to be turned off, to measure the first insulation performance of the battery pack shell; and / or, controlling the branch in which the second controllable switch is located to be turned on, and controlling the branches in which the first controllable switch, the third controllable switch, and the fourth controllable switch are located to be turned off, to measure the second insulation performance of the battery pack shell; and / or, controlling the branch in which the third controllable switch is located to be turned on, and controlling the branches in which the first controllable switch, the second controllable switch, and the fourth controllable switch are located to be turned off, to measure the third insulation performance of the battery pack shell; and / or, controlling the branch in which the fourth controllable switch is located to be turned on, and controlling the branches in which the first controllable switch, the second controllable switch, and the third controllable switch are located to be turned off, to measure the fourth insulation performance of the battery pack shell.

[0015] The multimeter detection module and method for new energy battery testing provided by the specification realize the connection relationship between devices through printed circuits on the integrated circuit board, reduce external wiring, and make manual wiring relatively simple and less prone to errors; the opening and closing of the relay is controlled to realize the sequential connection of multiple channels to the positive and negative terminals of the multimeter, avoiding frequent line switching; the integrated circuit board and various interfaces are integrated in a shell, which can better protect the wiring and various devices and meet the demand for reliable battery pack testing under various working conditions; the multimeter detection module contains not only an expansion channel but also a battery pack shell interface and an insulation detection unit, can realize leakage detection and insulation detection functions, has high integration, and makes full use of the space on the integrated circuit board; the relay and resistance used for testing are arranged on the integrated circuit board, only the interface used for testing is reserved on the shell, and machine soldering is used instead of manual wiring between components, reducing peripheral interference and improving reliability. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0017] Figure 1 The structure of the new energy battery testing cabinet provided by the embodiment of the specification is shown;

[0018] Figure 2A structural schematic diagram of a multimeter detection module provided by the present specification is shown.

[0019] Figure 3 A schematic diagram of an electrical connection relationship on an integrated circuit board is shown.

[0020] Figure 4 A flowchart of a battery pack detection method provided by the present specification is shown.

[0021] Figure 5 A flowchart of another battery pack detection method provided by the present specification is shown. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0023] The present specification provides a new energy battery test cabinet for battery pack testing. The new energy battery test cabinet includes a cabinet body 101, an industrial computer 102, a code scanning gun 103, test instruments and test modules. For example, the new energy battery test cabinet can be as shown in Figure 1 .

[0024] The cabinet body 1 has multiple layers of partitions arranged vertically. The industrial computer 102 is arranged on one layer of partition. The industrial computer 102 is used to run a test program module, and the industrial computer sends control instructions to the test module and acquires test data in the test instruments during the running of the test program module.

[0025] The code scanning gun 103 is arranged outside the cabinet body 101. The code scanning gun 103 is used to acquire a first identification code arranged on a measured object.

[0026] The test instruments and the test modules can be arranged on one layer of partition respectively, or can be arranged on the same layer of partition. For example, Figure 1 Each layer shown in FIG. 106 is used to arrange test instruments and test modules.

[0027] At least one interface of the test module is electrically connected with the measured object, and at least another interface is electrically connected with the test instruments. The test module is used to change the electrical connection relationship between the interface of the test instruments and the interface of the measured object according to the control instructions sent by the industrial computer 102.

[0028] The industrial computer 102 is also connected to the test instrument to facilitate the industrial computer 102 to read the test data in the test instrument.

[0029] In Figure 1 104 represents a display device, 105 is a small drawer in which input devices such as a keyboard and a mouse are placed, 106 represents an area for setting test instruments and test modules. Each of the multiple areas shown in 106 can be covered with a cover plate 107, and an observation window for observing data on the test instrument can be formed in the cover plate 107, which is covered with a transparent plate (such as an acrylic plate). 108 represents a plug-in power module of the new energy battery test cabinet, which converts the mains power into power used by various instruments and modules in the new energy battery test cabinet. 109 is a UPS power supply used as a backup power supply in the event of a power outage. 110 is an indicator light for test results or test status. 111 represents a ventilation hole above the cabinet. 112 represents a second display device customized by the customer. 113 represents the casters of the cabinet.

[0030] The present specification provides a multimeter detection module that can be placed in the above new energy battery cabinet, which is used for battery pack testing, Figure 2 A structure diagram of the multimeter detection module provided by the present specification is shown. The multimeter detection module includes a shell A, an integrated circuit board B, a first interface C, multiple second interfaces D, a battery pack shell interface E, and an insulation detection unit.

[0031] The shell A can be box-shaped, with one side open (such as the top) or fully enclosed. In the case of a fully enclosed form, the top cover can be removed to allow inspection and repair of the interior of the multimeter detection module.

[0032] The integrated circuit board B is fixedly arranged inside the shell A. The integrated circuit board B can be provided with components and devices, and can also have many wiring connections. For example, the integrated circuit board B can be provided with multiple controllable switches (such as relays, transistors, etc.), resistors, etc., and there can be many connection lines between these components and the first interface C and the second interface D. The components and devices can be connected to the first interface C and the second interface D by printed conductors. In addition, fixing the integrated circuit board C inside the shell A can effectively protect the components and wiring connections from damage, thereby improving the stability of the multimeter detection module.

[0033] The first interface C is arranged on the surface of the shell A, and the first interface C is used to connect the multimeter.

[0034] The second interface D is arranged on the surface of the shell A, each second interface D is a channel connected with the multimeter, that is, the output signal of each second interface can be equivalent to the output signal of the multimeter itself. Compared with the output signal of the multimeter detection module, the multimeter has more channels connected with the multimeter.

[0035] The first interface C and the second interface D are electrically connected with the integrated circuit board B.

[0036] In the detection of the battery pack, the leakage detection usually also needs to use the multimeter. Therefore, the leakage detection circuit can be integrated in the multimeter detection module. For this purpose, the multimeter detection module can further include a battery pack shell interface E.

[0037] The battery pack shell interface E is arranged on the surface of the shell A and is electrically connected with the integrated circuit board B. The battery pack shell interface E is used to be electrically connected with the shell of the battery pack.

[0038] On the basis of realizing the expansion of the multimeter channel and the leakage detection through the integrated circuit board B, the space utilization rate on the integrated circuit board B is usually not high. In order to improve the space utilization rate on the integrated circuit board B, the circuit required for other test items of the battery pack test can be arranged on the integrated circuit board B. Therefore, the multimeter detection module can include an insulation detection unit.

[0039] The insulation detection unit is electrically connected with the first interface C and the battery pack shell interface E, and is used for insulation detection of the battery pack.

[0040] The multimeter detection module provided in the present specification can realize the leakage detection and the insulation detection of the battery pack by connecting the battery pack shell through the battery pack shell interface E, connecting the multimeter with the first interface C, and connecting the power interface of the battery pack with the second interface, so that the number of interfaces is small and the wiring is simple.

[0041] The multimeter detection module for new energy battery test provided in the present specification realizes the connection relationship between devices through the printed circuit on the integrated circuit board, reduces the external wiring, makes the manual wiring relatively simple and less prone to errors, realizes the connection of the positive and negative terminals of the multimeter in turn through the opening and closing of the relay, avoids frequent line changing, integrates the integrated circuit board and various interfaces in a shell, can better protect the wiring and various devices, meets the demand of reliably realizing the battery pack test under various working conditions, and has high integration degree. The multimeter detection module includes the expanded channel, the battery pack shell interface, and the insulation detection unit, can realize the leakage detection and the insulation detection function, fully utilizes the space on the integrated circuit board, arranges the relays and resistors used for testing on the integrated circuit board, only retains the interfaces used for testing on the shell, replaces the manual wiring with machine soldering between components, reduces the peripheral interference, and improves the reliability.

[0042] Figure 3 The schematic diagram of the electrical connection relationship on the integrated circuit board is shown. Wherein, X10 represents the entity structure of the first interface, used for connecting the multimeter. The first interface X10 includes two connection ends, one connection end is used for connecting the positive pole of the multimeter, and the other connection end is used for connecting the negative pole of the multimeter; X20 represents the entity structure of the second interface, including ch1, ch1……ch6, etc. six multimeter expansion channels, each channel includes two ports, one of which is used for electrical connection with the positive pole of the multimeter, and the other is used for electrical connection with the negative pole of the multimeter. From Figure 3 It can be seen from the above that the ports of the expansion channel and the multimeter can be connected without any device in series, and then the result measured by the multimeter is accurate. Of course, the ports of the expansion channel and the multimeter can also be connected in series with a resistance, and then the accurate voltage value or resistance value can be obtained by subtracting the connected resistance from the measured result of the multimeter.

[0043] In some cases, it can be desirable to test the module through a plurality of branches connected to the multimeter detection module respectively, and whether each branch is conductive is controllable, and a controllable switch is connected in series in the line between at least one of the plurality of second interfaces D of the multimeter detection module and the first interface C.

[0044] The insulation detection unit includes a first subunit and a second subunit.

[0045] The first subunit is arranged between the positive pole connection end of the multimeter and the battery pack shell interface, and the first subunit includes a first parallel branch and a second parallel branch, a first resistance and a first controllable switch are arranged in series in the first parallel branch, and a second resistance and a second controllable switch are arranged in series in the second parallel branch.

[0046] The second subunit is arranged between the negative pole connection end of the multimeter and the battery pack shell interface; the second subunit includes a third parallel branch and a fourth parallel branch, a third resistance and a third controllable switch are arranged in series in the third parallel branch, and a fourth resistance and a fourth controllable switch are arranged in series in the fourth parallel branch.

[0047] As Figure 3 shown, the branch in which the first controllable switch K1 and the first resistance 500kΩ are located is the first branch, the branch in which the first controllable switch K2 and the second resistance 1MΩ are located is the second branch, the branch in which the third controllable switch K3 and the third resistance 500kΩ are located is the third branch, and the branch in which the fourth controllable switch K4 and the fourth resistance 1MΩ are located is the fourth branch. The four branches are arranged in parallel.

[0048] The insulation detection unit is connected between one connection end of the multimeter and the battery pack shell, and a resistor is connected between the connection end of the multimeter and the battery pack shell, so that the resistor simulates an insulator, and the insulation performance of the battery pack can be detected by checking the reflection of the battery pack.

[0049] In some embodiments, the insulation detection unit further comprises a fifth controllable switch, which is located between the first sub-unit and the battery pack shell interface and between the second sub-unit and the battery pack shell interface. That is, the fifth switch can control the on-off of each branch of the first sub-unit and the on-off of each branch of the second sub-unit. For example, the fifth controllable switch can be arranged at the position K5 shown in FIG. 5. Figure 3

[0050] In some embodiments, the battery pack shell interface is electrically connected to the positive connection end of the multimeter in the first interface, and / or the battery pack shell interface is electrically connected to the negative connection end of the multimeter in the second interface.

[0051] Further, when the battery pack shell interface is electrically connected to the positive connection end and the negative connection end of the multimeter in the first interface, respectively, a sixth controllable switch and a seventh controllable switch are further arranged between the battery pack shell interface and the first interface, the sixth controllable switch is used to control whether the battery pack shell interface and the positive connection end of the multimeter are conductive, and the seventh controllable switch is used to control whether the battery pack shell interface and the negative connection end of the multimeter are conductive.

[0052] As shown in FIG. 6, K6 represents the sixth controllable switch, and K7 represents the seventh controllable switch. Figure 3

[0053] In some embodiments, the multimeter detection module further comprises a controller and a communication interface.

[0054] The controller is arranged on the integrated circuit board B and is used to control the on-off state of the controllable switch.

[0055] The communication interface is arranged on the surface of the shell A. The communication interface is in communication connection with the controller and is further used to be in communication connection with the host computer to transmit the control signal of the controllable switch sent by the host computer. The controllable switch herein includes any one of the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch, the sixth controllable switch, and the seventh controllable switch.

[0056] By arranging the controller and the communication module, the multimeter detection module can realize automatic switching of each channel through the host computer and cut into the insulation detection circuit, the leakage detection circuit, etc. for testing at appropriate time.

[0057] On the basis of the multimeter detection module described above, the present specification provides a battery pack detection method, as shown in FIG. 8. Figure 4 ​​As shown, the method includes the following steps to achieve leakage current detection:

[0058] S11: When a multimeter is connected to the first interface, the target interface is connected to the power supply of the battery pack, and the battery pack housing interface is electrically connected to the housing of the battery pack, control the circuit between the target interface and the first interface to be turned on.

[0059] In some embodiments, one of the aforementioned plurality of second interfaces can be used as a target interface for connection to the power interface of the battery pack. The connection ports in this target interface are also the main positive connection terminal and the main negative connection terminal of the multimeter testing module.

[0060] Accordingly, the multimeter testing module may also include an eighth controllable switch and a ninth controllable switch. The eighth controllable switch is used to control whether the positive connection terminal in the first interface is connected to the positive connection terminal in the target interface, and the ninth controllable switch is used to control whether the negative connection terminal in the first interface is connected to the negative connection terminal in the target interface.

[0061] like Figure 3 As shown, when the circuit between the target interface and the first interface is connected, both the eighth controllable switch K8 and the ninth controllable switch K9 are closed.

[0062] S12: Controls the sixth controllable switch to close and the seventh controllable switch to open, in order to measure the voltage or resistance between the battery pack casing and the positive terminal of the multimeter.

[0063] like Figure 3 As shown, when K6 is closed, K7 is open, K8 is open, K9 is closed, and K1, K2, K3, and K4 are open (or K5 is open) (i.e., each branch in each insulation detection unit is open), the circuit between the battery pack housing interface E and the "positive" terminal of the multimeter is continuous. Therefore, the multimeter's measurement result is the voltage or resistance between the battery pack housing interface E and the "negative" terminal of the multimeter. Since the negative terminal of the multimeter is connected to the negative terminal of the battery pack, the multimeter's measurement result is essentially the voltage or resistance between the battery pack housing and the negative terminal of the battery. Under normal conditions (no leakage), the voltage between the battery pack housing interface E and the "negative" terminal of the multimeter should be 0, and the resistance should be infinite. If the multimeter's measurement result is not 0 and the resistance is low, it indicates leakage.

[0064] S13: Controls the seventh controllable switch to close and the sixth controllable switch to open, in order to measure the voltage or resistance between the battery pack casing and the negative terminal of the multimeter.

[0065] like Figure 3As described above, when K7 is closed and K6 is open, K8 is closed and K9 is open, and K1, K2, K3, and K4 are open (or K5 is open) (i.e., each branch in each insulation detection unit is open), the circuit between the battery pack housing interface E and the "negative" terminal of the multimeter is continuous. Therefore, the multimeter's measurement result is the voltage or resistance between the battery pack housing interface E and the "positive" terminal of the multimeter. Since the positive terminal of the multimeter is connected to the positive terminal of the battery pack, the multimeter's measurement result is essentially the voltage or resistance between the battery pack housing and the positive terminal of the battery. Under normal conditions (no leakage), the voltage between the battery pack housing interface E and the "positive" terminal of the multimeter should be 0, and the resistance should be infinite. If the multimeter's measurement result is not 0 and the resistance is low, it indicates leakage.

[0066] Step S11 is executed before S12 and S13. S12 and S13 can be executed separately or both. S13 can also be executed before S12. This specification does not limit the execution order of S12 and S13.

[0067] Based on the multimeter testing module described above, this manual provides a battery pack testing method, such as... Figure 5 As shown, the method includes the following steps to achieve insulation detection:

[0068] S21: Controls the eighth and ninth controllable switches to disconnect. For example... Figure 3 As mentioned above, K8 is disconnected and K9 is disconnected.

[0069] S22: Control the branch containing the first controllable switch to be turned on, and control the branches containing the second, third, and fourth controllable switches to be turned off; obtain the first resistance detection result stored in the battery pack management module, and determine the insulation detection performance of the battery pack based on the detection result.

[0070] like Figure 3 As shown, K6 and K7 are open, and K8 and K9 are also open, meaning the detection circuit is not connected to the multimeter. K1 and K5 are closed, and K2, K3, and K4 are open. This means a first resistor of 500kΩ is connected between the battery pack casing and the "positive" connection terminal of the battery pack. The battery pack will then detect this resistance and store the result in the battery management module (BMS). The host computer in the new energy battery testing cabinet can read the battery test results stored in the BMS through the communication interface with the battery pack and determine the insulation performance of the battery pack based on the test results.

[0071] S23: Control the branch containing the second controllable switch to be turned on, and control the branches containing the first, third, and fourth controllable switches to be turned off; obtain the second resistance detection result stored in the battery pack management module, and determine the insulation detection performance of the battery pack based on the detection result.

[0072] As shown in Figure 3 K6, K7 are disconnected, K8 and K9 are also disconnected, that is, the detection circuit does not access the multimeter. K2 and K5 are closed, K1, K3, K4 are disconnected, then the second resistance 1MΩ is accessed between the battery pack shell and the "positive" connection end of the battery pack, at this time the battery pack will detect the resistance and store the detection result in the battery management module BMS of the battery pack. The host computer in the new energy battery test cabinet can read the battery detection result stored in the battery management module BMS of the battery pack through the communication interface of the battery pack, and determine the insulation detection performance of the battery pack according to the detection result.

[0073] S24: control the branch where the third controllable switch is located to be conductive, control the branches where the first controllable switch, the second controllable switch and the fourth controllable switch are located to be disconnected; obtain the second resistance detection result stored in the battery pack management module, and determine the insulation detection performance of the battery pack according to the detection result.

[0074] As shown in Figure 3 K6, K7 are disconnected, K8 and K9 are also disconnected, that is, the detection circuit does not access the multimeter. K3 and K5 are closed, K1, K2, K4 are disconnected, then the third resistance 500kΩ is accessed between the battery pack shell and the "negative" connection end of the battery pack, at this time the battery pack will detect the resistance and store the detection result in the battery management module BMS of the battery pack. The host computer in the new energy battery test cabinet can read the battery detection result stored in the battery management module BMS of the battery pack through the communication interface of the battery pack, and determine the insulation detection performance of the battery pack according to the detection result.

[0075] S25: control the branch where the fourth controllable switch is located to be conductive, control the branches where the first controllable switch, the second controllable switch and the third controllable switch are located to be disconnected; obtain the second resistance detection result stored in the battery pack management module, and determine the insulation detection performance of the battery pack according to the detection result.

[0076] As shown in Figure 3 K6, K7 are disconnected, K8 and K9 are also disconnected, that is, the detection circuit does not access the multimeter. K4 and K5 are closed, K1, K2, K3 are disconnected, then the fourth resistance 1MΩ is connected in series between the battery pack shell and the "negative" connection end of the battery pack, at this time the battery pack will detect the resistance and store the detection result in the battery management module BMS of the battery pack. The host computer in the new energy battery test cabinet can read the battery detection result stored in the battery management module BMS of the battery pack through the communication interface of the battery pack, and determine the insulation detection performance of the battery pack according to the detection result.

[0077] The step S21 is performed before S22, S23, S24, S25, and can be performed only one or more of S22, S23, S24, S25, or all of them. The present specification does not limit the execution order of S22, S23, S24, S25.

[0078] The steps S11-S13 and S21-S25 can exist in the same embodiment at the same time.

[0079] Each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments mainly describes the difference from other embodiments. Especially, for the hardware+program type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0080] The specific embodiments of the present specification are described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order and still achieve desirable results. Additionally, the process depicted in the figures can not require the particular order shown or sequential order to achieve desirable results. In some embodiments, multitasking and parallel processing can be advantageous.

[0081] The above merely describes the embodiments of the present specification and is not intended to limit the present specification. The present specification can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present specification shall be included in the scope of claims of the present specification.

Claims

1. A multimeter testing module for battery pack testing, characterized in that, include: case; An integrated circuit board is disposed inside the housing; The first interface is provided on the surface of the housing; The first interface is used to connect to a multimeter; Multiple second interfaces are provided on the surface of the housing; each second interface serves as a channel for connection to a multimeter. The first interface and the second interface are electrically connected to the integrated circuit board; A battery pack housing interface is disposed on the surface of the housing; the battery pack housing interface is used for electrical connection with the housing of the battery pack; An insulation detection unit is electrically connected to the first interface and the battery pack housing interface, and is used to perform insulation detection on the battery pack. The controller, located on the integrated circuit board, controls the opening and closing states of each controllable switch to ensure the continuity of the circuit between the battery pack housing interface and the positive or negative terminal of the multimeter, thereby achieving leakage current detection in conjunction with the multimeter test results; and enables the connection of a first parallel circuit, a second parallel circuit, a third parallel circuit, or a fourth parallel circuit between the battery pack housing and the positive or negative connection terminal of the battery pack without the multimeter being connected to the detection circuit, and determines the insulation performance of the battery pack in conjunction with the test results of the battery management module of the battery pack. A communication interface is provided on the surface of the housing; the communication interface is connected to the controller and is also used to connect to a host computer to transmit control signals sent by the host computer to the controllable switch; The insulation detection unit includes: The first subunit is disposed between the positive terminal of the multimeter and the interface of the battery pack housing; the first subunit includes a first parallel branch and a second parallel branch, wherein a first resistor and a first controllable switch are connected in series in the first parallel branch, and a second resistor and a second controllable switch are connected in series in the second parallel branch. The second subunit is located between the negative terminal of the multimeter and the interface of the battery pack housing; the second subunit includes a third parallel branch and a fourth parallel branch, wherein a third resistor and a third controllable switch are connected in series in the third parallel branch, and a fourth resistor and a fourth controllable switch are connected in series in the fourth parallel branch. The insulation detection unit further includes a fifth controllable switch, which is located between the first subunit and the battery pack housing interface, and between the second subunit and the battery pack housing interface; When the battery pack housing interface is electrically connected to the positive and negative terminals of the multimeter in the first interface, a sixth controllable switch and a seventh controllable switch are also provided between the battery pack housing interface and the first interface. The sixth controllable switch is used to control whether the battery pack housing interface is connected to the positive terminal of the multimeter, and the seventh controllable switch is used to control whether the battery pack housing interface is connected to the negative terminal of the multimeter. One of the plurality of second interfaces serves as a target interface for connection to the power interface of the battery pack; the multimeter testing module further includes: The eighth controllable switch is used to control whether the positive terminal in the first interface is connected to the positive terminal in the target interface. The ninth controllable switch is used to control whether the negative terminal of the first interface is connected to the negative terminal of the target interface.

2. The multimeter testing module according to claim 1, characterized in that, A controllable switch is connected in series in the line between at least one of the plurality of second interfaces and the first interface.

3. The multimeter testing module according to claim 1, characterized in that, The battery pack housing interface is electrically connected to the positive terminal of the multimeter in the first interface, and / or the battery pack housing interface is electrically connected to the negative terminal of the multimeter in the second interface.

4. A battery pack testing method, characterized in that, The multimeter testing module according to any one of claims 1 to 3, wherein one of the plurality of second interfaces is a target interface; the method includes performing leakage current detection by the following method: When a multimeter is connected to the first interface, the target interface is connected to the power supply of the battery pack, and the battery pack housing interface is electrically connected to the housing of the battery pack, the circuit between the target interface and the first interface is controlled to be connected. Controlling the sixth controllable switch to close and the seventh controllable switch to open, to measure the voltage or resistance between the battery pack casing and the negative terminal of the multimeter; and / or controlling the seventh controllable switch to close and the sixth controllable switch to open, to measure the voltage or resistance between the battery pack casing and the positive terminal of the multimeter.

5. A battery pack testing method, characterized in that, The multimeter testing module according to any one of claims 1 to 3, the method comprising performing insulation testing by means of the following method: The eighth controllable switch and the ninth controllable switch are disconnected. Controlling the branch containing the first controllable switch to be on, and controlling the branches containing the second, third, and fourth controllable switches to be off, to measure the first insulation performance of the battery pack casing; and / or, Controlling the branch containing the second controllable switch to be on, and controlling the branches containing the first, third, and fourth controllable switches to be off, to measure the second insulation performance of the battery pack casing; and / or, The branch containing the third controllable switch is turned on, and the branches containing the first, second, and fourth controllable switches are turned off, to measure the third insulation performance of the battery pack casing; and / or, The branch containing the fourth controllable switch is turned on, and the branches containing the first, second, and third controllable switches are turned off, in order to measure the fourth insulation performance of the battery pack casing.

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