Test structure for battery management system

Abstract

The utility model discloses a test structure for a battery management system, and the structure comprises a switching device which is provided with a plurality of switching pins, and the switching pins are connected to pins in a to-be-tested battery management controller in a one-to-one correspondence manner, and are used for achieving the lead-out of the pins in the to-be-tested battery management controller; the low-voltage source is connected to a power supply pin of the to-be-tested battery management controller through a switching pin in the switching equipment and is used for supplying power to the to-be-tested battery management controller; the signal input equipment is connected to the to-be-tested battery management controller through a switching pin in the switching equipment and is used for inputting a signal to the to-be-tested battery management controller; and the output function verification equipment is connected to a corresponding switching pin in the switching equipment and is used for constructing a high-voltage sampling loop and forming a test environment for the battery management controller to be tested. According to the test structure for the battery management system, the to-be-tested battery management controller can be tested at low cost.

Description

Technical Field

[0001] The present application relates to the technical field of battery management system testing, and in particular to a test structure for a battery management system. Background Art

[0002] Lithium batteries have gradually become the mainstream power source for applications such as electric vehicles and large-scale energy storage due to their high energy density and pollution-free. Due to the poor abuse resistance of lithium batteries, they must be monitored and managed by the battery management system (BMS) during use. The performance of BMS is related to the safety performance, work efficiency and cycle life of the power battery pack. Therefore, the performance of BMS must be tested before leaving the factory to improve its reliability. At present, the performance test of BMS is mainly completed through a test bench, which includes a host computer, a slave computer and several types of boards. Generally speaking, the system motherboard of BMS is mounted on the battery management controller (BMC). When testing using the test bench, the slave computer receives the host computer signal and injects relevant signals into the battery management controller through the model control board to complete the test.

[0003] However, with the increasing demand for BMS, the number of test benches used for system performance testing is limited. When multiple projects are running simultaneously in a short period of time, on the one hand, it is very easy to cause a shortage of test resources, which will affect the progress of the test to a certain extent. On the other hand, the purchase of additional test benches may cause a waste of resources. Utility Model Content

[0004] In order to solve the above problems, the present application provides a test structure for a battery management system.

[0005] The present application embodiment provides a test structure for a battery management system, including:

[0006] A transfer device, wherein a plurality of transfer pins are arranged on the transfer device, and the transfer pins are connected to the pins in the battery management controller to be tested in a one-to-one correspondence, so as to realize the lead-out of the pins in the battery management controller to be tested, wherein the battery management controller to be tested is equipped with a mainboard of the battery management system to be tested;

[0007] A low voltage source, connected to a power supply pin of the battery management controller to be tested through a transfer pin in the transfer device, for supplying power to the battery management controller to be tested;

[0008] A signal input device, connected to the battery management controller to be tested via a transfer pin in the transfer device, and used to input a signal to the battery management controller to be tested;

[0009] The output function verification device is connected to the corresponding adapter pin in the adapter device and is used to construct a high-voltage sampling loop to form a test environment for the battery management controller to be tested.

[0010] In some embodiments, the transfer pin includes a battery pack positive sampling pin, a battery pack negative sampling pin, a main positive outer sampling pin and a main negative outer sampling pin, wherein the battery pack positive sampling pin and the battery pack negative sampling pin are connected to the battery sampling pin of the battery management controller to be tested, and the output function verification device includes:

[0011] A high-voltage source, wherein the positive and negative electrodes of the high-voltage source are respectively connected to the positive sampling pin and the negative sampling pin of the battery pack, and a high-voltage sampling signal processing module is provided in the application layer software of the battery management controller to be tested, for amplifying the collected output voltage of the high-voltage source to obtain the test voltage required for the test;

[0012] A first relay, wherein contact ends of the first relay are respectively connected to the positive sampling pin of the battery pack and the main positive outer sampling pin;

[0013] A second relay, wherein contact ends of the second relay are respectively connected to the battery pack negative sampling pin and the main negative outer sampling pin;

[0014] The coils of the first relay and the second relay are respectively connected to the battery management controller to be tested through adapter pins in the adapter device.

[0015] In some embodiments, the signal input device includes a CAN device and a PWM signal transmitter.

[0016] In some embodiments, a sensor is further included, and the sensor is connected to the battery management controller to be tested through a switching pin in a switching device.

[0017] In some embodiments, a single cell simulator and a battery management controller are also included. The single cell simulator is used to simulate the parameters of a single cell battery. The battery management controller is connected between the single cell simulator and a switching device to transmit the output of the single cell simulator to the battery management controller to be tested through the switching pin of the switching device.

[0018] In some embodiments, a pre-charging resistor and a pre-charging relay are connected between the positive sampling pin of the battery pack and the main positive outer pin. The contacts of the pre-charging resistor and the pre-charging relay are connected in series and in parallel with the contacts of the first relay. The coil of the pre-charging relay is connected to the battery management controller to be tested via the adapter pin in the adapter device.

[0019] In some embodiments, a first resistor is connected in series between the two transfer pins connected to the high-voltage interlock pins in the battery management controller to be tested.

[0020] In some embodiments, the low voltage source is a 12V DC power supply.

[0021] The technical solution of this application has at least the following advantages:

[0022] Through the setting of the adapter device, each pin of the battery management controller to be tested can be brought out, which is convenient for the subsequent signal input and output signal collection of the battery management controller to be tested. At the same time, through the setting of the low-voltage source, signal input device and output function verification device, a complete high-voltage framework is formed in the adapter device, so that the battery management system can be tested without the host computer, board card and slave computer. Compared with the existing test equipment, it saves test resources and improves test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 is a schematic diagram of a framework of a test structure for a battery management system provided by an exemplary embodiment of the present application;

[0025] Figure 2 It is a schematic diagram of a high-voltage sampling circuit of an existing battery management controller during actual operation provided by an exemplary embodiment of the present application;

[0026] Figure 3 It is a schematic diagram provided by an exemplary embodiment of the present application for reflecting the connection relationship between the output function verification device and the switching device.

[0027] Explanation of the accompanying drawings: 1. Transfer device; 2. Low voltage source; 3. Signal input device; 4. Output function verification device. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0032] The present application embodiment provides a test structure for a battery management system, referring to Figure 1 , the test structure for the battery management system includes an adapter device 1, a low voltage source 2, a signal input device 3 and an output function verification device 4, which is used to test the battery management controller to be tested which is equipped with the battery management system motherboard to be tested, thereby realizing the test of the battery management system. Among them, the adapter device 1 is provided with a number of adapter pins, and the adapter pins correspond to the pins in the battery management controller (Battery Management Chip, BMC) to be tested one by one. Each adapter pin can be connected to the pins in the battery management controller to be tested through a lead wire, an adapter, etc., so as to realize the lead-out of the pins in the battery management controller to be tested, which is convenient for the subsequent signal input and output signal collection of the battery management controller to be tested. Among them, the configuration of the adapter pins in the adapter device 1 can be specifically set according to the number and type of pins in the battery management controller to be tested. The signal input device 3 is connected to each signal input pin in the battery management controller to be tested through the corresponding adapter pins in the adapter device 1, and is used to input signals to the battery management controller to be tested. The output function verification device 4 is connected to the corresponding adapter pin in the adapter device 1, and is used to construct a high-voltage sampling circuit similar to the actual working environment of the BMC, forming a test environment for the battery management controller to be tested. Among them, the existing high-voltage sampling circuit when the BMC is actually working can be as follows Figure 2 shown.

[0033] In this embodiment, the low-voltage source 2 adopts a 12V DC power supply, and the positive and negative electrodes of the low-voltage source 2 are respectively connected to the power input pins of the battery management controller to be tested through corresponding adapter pins, thereby realizing power supply to the battery management controller to be tested.

[0034] Furthermore, the signal input device 3 includes a CAN (Controller Area Network) device and a PWM (PulseWidth Modulation) signal transmitter. Among them, the CAN device may include an internal CAN device responsible for the current sensor signal, a charging CAN device for simulating the interaction with the charging pile, a vehicle CAN device for signal interaction with the battery management controller, etc., which can be specifically set according to the specifications of the battery management controller to be tested. The high and low sides of the CAN device are connected to the corresponding adapter pins in the adapter device 1, and can then be connected to each signal input pin in the battery management controller to be tested. The PWM signal transmitter is also connected to the PWM signal input pin in the battery management controller to be tested through the corresponding adapter pin, and is used to input PWM signals such as high-voltage interlock and collision to the battery management controller to be tested.

[0035] Further, see Figure 1 and Figure 3 The output function verification device 4 includes a high voltage source, a first relay K1 and a second relay K2. The adapter pins in the adapter device 1 include a battery pack positive sampling pin P1, a main positive outer sampling pin P2, a main negative outer sampling pin P3 and a battery pack negative sampling pin P4. Among them, the battery pack positive sampling pin P1 and the battery pack negative sampling pin P4 are connected to the battery sampling pins in the battery management controller to be tested for connecting the batteries controlled by it.

[0036] Among them, the positive and negative electrodes of the high-voltage source are respectively connected to the positive sampling pin P1 of the battery pack and the negative sampling pin P4 of the battery pack, and are used to simulate the high-voltage output of the battery for the battery management controller to be tested. In some embodiments, the high-voltage source and the low-voltage source 2 mentioned above can use the same power supply, and the output of the power supply can be connected in parallel to two circuits, one of which is connected to the power input pin of the battery management controller to be tested through the corresponding adapter pin, and is used to power the battery management controller to be tested, and the other can be connected to the positive sampling pin of the battery pack and the negative sampling pin of the battery pack.

[0037] The battery management controller to be tested is provided with a high-voltage sampling signal processing module, which is used to amplify the output voltage of the collected high-voltage source, so as to obtain the required test voltage at the application layer to meet the test conditions of the battery management controller to be tested. Among them, the specific amplification factor can be set according to the needs, so the high-voltage source can be flexibly selected, so as to effectively control the maximum voltage used by the test structure and reduce the risks brought by high voltage.

[0038] Further, see Figure 3 The contact end of the first relay K1 is respectively connected to the positive sampling pin P1 of the battery pack and the main positive outer sampling pin P2, and the contact end of the second relay K2 is respectively connected to the negative sampling pin P4 of the battery pack and the main negative outer sampling pin P3. The coils of the first relay K1 and the second relay K2 (not shown in the figure) are respectively connected to the battery management controller to be tested through the adapter pins in the adapter device 1, so that the battery management controller to be tested can drive the first relay K1 and the second relay K2, and then verify the control function of the battery management controller to be tested on the relay.

[0039] Further, see Figure 1 The test structure for the battery management system provided in the embodiment of the present application also includes a sensor, which is connected to the corresponding sensor signal acquisition pin in the battery management controller to be tested through the adapter pin in the adapter device 1. Inside the battery pack, some sensors are needed to collect information such as current and air pressure. These sensors are powered by the BMC. Therefore, in the embodiment of the present application, the sensor is connected to prevent the battery management controller to be tested from reporting a fault that the sensor is not detected.

[0040] Further, see Figure 1 The test structure for the battery management system provided in the embodiment of the present application also includes a cell simulator and a cell management controller (CMC), wherein the cell simulator is used to simulate the voltage, module temperature and other operating parameters of the single cell battery, and the cell management controller is connected between the cell simulator and the corresponding adapter pins in the adapter device 1, and is used to transmit the output of the cell simulator to the battery management controller to be tested through the adapter pins of the adapter device 1. In the embodiment of the present application, multiple cell management controllers are arranged as follows Figure 1 are connected to each other in a daisy chain manner as shown in FIG.

[0041] Further, see Figure 1 and Figure 3A pre-charging resistor and a pre-charging relay K3 are also connected between the positive sampling pin P1 of the battery pack and the main positive outer pin P2. The contacts of the pre-charging resistor and the pre-charging relay R3 are connected in series and in parallel with the contacts of the first relay K1. The coil of the pre-charging relay R3 is connected to the battery management controller to be tested through the adapter pin in the adapter device 1. In the high-voltage circuit, the pre-charging resistor mainly plays a protective role. The setting of the pre-charging relay R3 is also to verify the control function of the battery management controller to be tested on the corresponding relay in the actual circuit.

[0042] Furthermore, a first resistor is connected in series between two transfer pins of the high-voltage interlock pin of the battery management controller to be tested, so as to avoid reporting faults related to the high-voltage interlock function during the test process.

[0043] Furthermore, a resistor of a certain resistance may be externally connected between the insulation detection center point and the positive sampling pin of the battery pack, and between the insulation detection center point and the negative sampling pin of the battery pack, thereby simulating the insulation resistance of the insulation detection center point to the positive and negative sides, and completing insulation-related logic verification.

[0044] The test structure for a battery management system provided in the embodiment of the present application can lead out various pins of the battery management controller to be tested through the setting of the adapter device 1, so as to facilitate the subsequent signal input and output signal collection of the battery management controller to be tested. At the same time, through the setting of the low-voltage source 2, the signal input device 3 and the output function verification device 4, a complete high-voltage framework is formed in the adapter device 1, so that the battery management system can be tested without the host computer, the board card and the slave computer. Compared with the existing test equipment, it saves test resources and improves test efficiency.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.

Claims

1. A test structure for a battery management system, characterized in that: include: A transfer device, wherein a plurality of transfer pins are arranged on the transfer device, and the transfer pins are connected to the pins in the battery management controller to be tested in a one-to-one correspondence, so as to realize the lead-out of the pins in the battery management controller to be tested, wherein the battery management controller to be tested is equipped with a mainboard of the battery management system to be tested; A low voltage source, connected to a power supply pin of the battery management controller to be tested through a transfer pin in the transfer device, for supplying power to the battery management controller to be tested; A signal input device, connected to the battery management controller to be tested via a transfer pin in the transfer device, and used to input a signal to the battery management controller to be tested; The output function verification device is connected to the corresponding adapter pin in the adapter device and is used to construct a high-voltage sampling loop to form a test environment for the battery management controller to be tested.

2. The test structure for a battery management system according to claim 1, characterized in that: The transfer pins include a battery pack positive sampling pin, a battery pack negative sampling pin, a main positive outer sampling pin and a main negative outer sampling pin, wherein the battery pack positive sampling pin and the battery pack negative sampling pin are connected to the battery sampling pin of the battery management controller to be tested, and the output function verification device includes: A high-voltage source, wherein the positive and negative electrodes of the high-voltage source are respectively connected to the positive sampling pin and the negative sampling pin of the battery pack, and a high-voltage sampling signal processing module is provided in the application layer software of the battery management controller to be tested, for amplifying the collected output voltage of the high-voltage source to obtain the test voltage required for the test; A first relay, wherein contact ends of the first relay are respectively connected to the positive sampling pin of the battery pack and the main positive outer sampling pin; A second relay, wherein contact ends of the second relay are respectively connected to the battery pack negative sampling pin and the main negative outer sampling pin; The coils of the first relay and the second relay are respectively connected to the battery management controller to be tested through the adapter pins in the adapter device.

3. The test structure for a battery management system according to claim 1, characterized in that: The signal input device includes a CAN device and a PWM signal transmitter.

4. The test structure for a battery management system according to claim 1, characterized in that: It also includes a sensor, which is connected to the battery management controller to be tested through a switching pin in a switching device.

5. The test structure for a battery management system according to claim 2, characterized in that: It also includes a single-cell simulator and a battery management controller. The single-cell simulator is used to simulate the parameters of a single-cell battery. The battery management controller is connected between the single-cell simulator and a switching device to transmit the output of the single-cell simulator to the battery management controller to be tested through the switching pin of the switching device.

6. The test structure for a battery management system according to claim 2, characterized in that: A pre-charging resistor and a pre-charging relay are connected between the positive sampling pin of the battery pack and the main positive outer pin. The contacts of the pre-charging resistor and the pre-charging relay are connected in series and in parallel with the contacts of the first relay. The coil of the pre-charging relay is connected to the battery management controller to be tested through the adapter pin in the adapter device.

7. The test structure for a battery management system according to claim 1, characterized in that: A first resistor is connected in series between the two transfer pins connected to the high-voltage interlock pins in the battery management controller to be tested.

8. The test structure for a battery management system according to claim 1, characterized in that: The low voltage source adopts a 12V DC power supply.

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