Device and method for testing battery system

Abstract

The invention relates to a testing device and method of a battery system, and relates to the technical field of battery testing. The testing device of the battery system comprises a first switch, a second switch, a third switch and a fourth switch, the first end of the first switch is connected with a main positive relay of the battery system, and the second end of the first switch is connected with the positive electrode of a charging and discharging cabinet; the first end of the second switch is connected with a main negative relay of the battery system, and the second end of the second switch is connected with the negative electrode of the charging and discharging cabinet; the first end of the third switch is connected with a charging positive relay of the battery system, and the second end of the third switch is connected with the positive electrode of the charging and discharging cabinet; the first end of the fourth switch is connected with a charging negative relay of the battery system, and the second end of the fourth switch is connected with the negative electrode of the charging and discharging cabinet; and the controller is configured to control on and off of the first switch, the second switch, the third switch and the fourth switch.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery testing, and in particular to a testing device and method for a battery system. Background Art

[0002] The battery system is an energy storage device consisting of one or more battery packs and corresponding accessories (battery management system, high-voltage circuit, low-voltage circuit and mechanical assembly, etc.). With the development of electrified host technology, the battery system, as the core power component of pure electric hosts, directly determines the performance and competitiveness of the host and the satisfaction of end users. During the design and development stage, technicians will conduct special adaptive design of the battery in terms of capacity, energy, low-temperature performance, service life and other performance, so that the battery performance meets the host requirements to ensure that it can work efficiently and stably in harsh environments.

[0003] However, some external factors in the design process will affect the final performance of the battery system. Therefore, comprehensive and effective testing and verification are required before the battery system is put on the market. During the battery system testing and verification process, the power battery system needs to be repeatedly charged and discharged using a battery charging and discharging cabinet and a DC charging pile. Summary of the invention

[0004] According to a first aspect of the present disclosure, a test device for a battery system is provided, comprising: a first switch, wherein a first end of the first switch is connected to a main positive relay of the battery system, and a second end of the first switch is connected to a positive pole of a charging and discharging cabinet; a second switch, wherein a first end of the second switch is connected to a main negative relay of the battery system, and a second end of the second switch is connected to a negative pole of the charging and discharging cabinet; a third switch, wherein a first end of the third switch is connected to a charging positive relay of the battery system, and a second end of the third switch is connected to a positive pole of the charging and discharging cabinet; a fourth switch, wherein a first end of the fourth switch is connected to a charging negative relay of the battery system, and a second end of the fourth switch is connected to a negative pole of the charging and discharging cabinet; and a controller, configured to control the closing and opening of the first switch, the second switch, the third switch, and the fourth switch.

[0005] In some embodiments, the controller includes: an output port for a positive signal of a low-voltage auxiliary power source; and an output port for a charging connection confirmation signal.

[0006] In some embodiments, the controller includes: an output port for an ignition switch-on status signal.

[0007] In some embodiments, the controller communicates with the charging and discharging cabinet through a first bus channel via a controller area network; the controller communicates with the battery system through a second bus channel and a third bus channel.

[0008] In some embodiments, the first end of the main positive relay is connected to the positive pole of the battery system, and the second end of the main positive relay is connected to the first end of the first switch; the first end of the main negative relay is connected to the negative pole of the battery system, and the second end of the main negative relay is connected to the first end of the second switch; the first end of the charging positive relay is connected to the positive pole of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch; the first end of the charging negative relay is connected to the negative pole of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch.

[0009] In some embodiments, the testing device for the battery system further includes: a fifth switch, wherein a first end of the fifth switch is connected to the positive electrode of the battery system; a second end of the fifth switch is connected to the second end of the first switch and / or a second end of the fifth switch is connected to the second end of the third switch; and the controller is further configured to control the closing and opening of the fifth switch.

[0010] In some embodiments, the testing device for the battery system further includes: a sixth switch, wherein the first end of the sixth switch is connected to the second end of the fourth switch and / or the first end of the sixth switch is connected to the second end of the second switch; the second end of the sixth switch is connected to the negative pole of the battery system; and the controller is further configured to control the closing and opening of the sixth switch.

[0011] According to a second aspect of the present disclosure, a method for testing a battery system is provided, comprising: utilizing the battery system testing device described in any of the embodiments of the present disclosure to perform charging and discharging tests on the battery system.

[0012] In some embodiments, the charging and discharging test of the battery system includes: a controller controls the first switch and the second switch to be closed, and the third switch and the fourth switch to be opened, so as to perform a discharge test on the battery system.

[0013] In some embodiments, the controlling of the first switch and the second switch to close and the third switch and the fourth switch to open to perform a discharge test on the battery system includes: a controller receiving discharge test mode information of a charge and discharge cabinet; the controller controlling the first switch and the second switch to close and the third switch and the fourth switch to open according to the discharge test mode information; and the controller outputting an ignition switch on state signal.

[0014] In some embodiments, the charging and discharging test of the battery system includes: a controller controls the first switch and the second switch to be opened, and the third switch and the fourth switch to be closed, so as to perform a charging test on the battery system.

[0015] In some embodiments, the controller controls the first switch and the second switch to be disconnected, and the third switch and the fourth switch to be closed, so as to perform a charging test on the battery system, including: the controller receives the charging test mode information of the charging and discharging cabinet; the controller controls the first switch and the second switch to be disconnected, and the third switch and the fourth switch to be closed according to the charging test mode information; the controller outputs the positive pole signal of the low-voltage auxiliary power supply and the charging connection confirmation signal; the controller and the battery system exchange the first DC charging information; the controller and the charging and discharging cabinet exchange the second DC charging information; the charging and discharging cabinet charges the battery system.

[0016] In some embodiments, the testing method of the battery system also includes: the controller controls the first switch and the fifth switch to close, wherein the first end of the fifth switch is connected to the positive electrode of the battery system, the second end of the fifth switch is connected to the second end of the first switch, the first end of the main positive relay is connected to the positive electrode of the battery system, and the second end of the main positive relay is connected to the first end of the first switch; the battery system executes a process from a state without high-voltage output to a state with high-voltage output.

[0017] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a state with high voltage output from a state without high voltage output; the controller controls the first switch and the fifth switch to close, wherein the first end of the fifth switch is connected to the positive pole of the battery system, the second end of the fifth switch is connected to the second end of the first switch, the first end of the main positive relay is connected to the positive pole of the battery system, and the second end of the main positive relay is connected to the first end of the first switch; the battery system executes a process of entering a state without high voltage output from a state with high voltage output.

[0018] In some embodiments, the testing method of the battery system also includes: the controller controls the second switch and the sixth switch to close, wherein the first end of the sixth switch is connected to the second end of the second switch, the second end of the sixth switch is connected to the negative pole of the battery system, the first end of the main negative relay is connected to the negative pole of the battery system, and the second end of the main negative relay is connected to the first end of the second switch; the battery system executes a process from a state without high-voltage output to a state with high-voltage output.

[0019] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a state with high voltage output from a state without high voltage output; the controller controls the second switch and the sixth switch to close, wherein the first end of the sixth switch is connected to the second end of the second switch, the second end of the sixth switch is connected to the negative pole of the battery system, the first end of the main negative relay is connected to the negative pole of the battery system, and the second end of the main negative relay is connected to the first end of the second switch; the battery system executes a process of entering a state without high voltage output from a state with high voltage output.

[0020] In some embodiments, the testing method of the battery system also includes: the controller controls the third switch and the fifth switch to close, wherein the first end of the fifth switch is connected to the positive electrode of the battery system, the second end of the fifth switch is connected to the second end of the third switch, the first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch; the battery system executes a process of entering a charging state from a no high-voltage output state.

[0021] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a charging state from a state without high voltage output; the controller controls the third switch and the fifth switch to close, wherein the first end of the fifth switch is connected to the positive pole of the battery system, the second end of the fifth switch is connected to the second end of the third switch, the first end of the charging positive relay is connected to the positive pole of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch; the battery system executes a process of entering a state without high voltage output from a charging state.

[0022] In some embodiments, the testing method of the battery system also includes: a controller controls the fourth switch and the sixth switch to close, wherein the first end of the sixth switch is connected to the second end of the fourth switch, the second end of the sixth switch is connected to the negative electrode of the battery system, the first end of the charging negative relay is connected to the negative electrode of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch; the battery system executes a process of entering a charging state from a no high voltage output state.

[0023] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a charging state from a state without high voltage output; the controller controls the fourth switch and the sixth switch to close, wherein the first end of the sixth switch is connected to the second end of the fourth switch, the second end of the sixth switch is connected to the negative pole of the battery system, the first end of the charging negative relay is connected to the negative pole of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch; the battery system executes a process of entering a state without high voltage output from a charging state. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0025] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0026] Figure 1a-1b A battery system test connection schematic diagram showing the related art;

[0027] Figure 2 A schematic diagram showing a testing device for a battery system according to some embodiments of the present disclosure;

[0028] Figure 3 A schematic diagram showing a testing device for a battery system according to some other embodiments of the present disclosure;

[0029] Figure 4 A flow chart showing a method for testing a battery system according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0031] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0034] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] In the related art, there are several battery testing schemes as follows.

[0037] The hardware-in-the-Loop (HIL) semi-physical simulation test solution simulates the battery system operating environment in real scenarios through a hardware simulation platform, connects the battery management system (BMS) of the battery system with the DC fast charging simulation model and exchanges data in real time, thereby realizing the DC fast charging test of the battery system. Although HIL testing can simulate a variety of complex external factors, the accuracy of the simulation model is still subject to certain limitations. Even if the battery system has undergone HIL testing, it still cannot reflect the actual situation of the real battery system, resulting in certain differences between the test verification and the actual situation.

[0038] This results in some differences between the test results and the actual situation.

[0039] The solution of a separate battery charging and discharging cabinet is to implement charging and discharging tests on the high-voltage main circuit of the battery system. The test conditions of this solution deviate from the actual operating conditions of the battery system (that is, the charging process should be achieved through the charging circuit).

[0040] Figure 1a-1b A battery system test connection schematic diagram of the related art is shown.

[0041] Figure 1a Shows the connection scheme for testing using a battery charging and discharging cabinet alone. Figure 1b The connection scheme for testing using a DC charging pile and a charging and discharging cabinet is shown.

[0042] like Figure 1a-1b As shown, the battery system high voltage box includes a fuse, a main positive relay, a main negative relay, a pre-charge relay, a pre-charge resistor, a charging positive relay, and a charging negative relay. One end of the battery system high voltage box is connected to the battery system, and the other end is connected to the charging and discharging cabinet or the DC charging pile.

[0043] exist Figure 1a In the battery system test scheme shown, the high-voltage channel of the battery charging and discharging cabinet is only connected to the high-voltage main circuit of the battery system. The charging and discharging of the battery system are realized through the same high-voltage channel, and continuous charging and discharging tests are realized on the high-voltage main circuit. This situation deviates from the actual situation of host use, that is, the charging process should be realized through the charging circuit.

[0044] The present disclosure provides a testing device and method for a battery system, which improves the safety and testing efficiency of the testing process.

[0045] In some embodiments, the test device of the battery system includes: a first switch (S1), wherein a first end of the first switch (S1) is connected to a main positive relay of the battery system, and a second end of the first switch (S1) is connected to a positive pole of a charging and discharging cabinet; a second switch (S2), wherein a first end of the second switch (S2) is connected to a main negative relay of the battery system, and a second end of the second switch (S2) is connected to a negative pole of the charging and discharging cabinet; a third switch (S3), wherein a first end of the third switch (S3) is connected to a charging positive relay of the battery system, and a second end of the third switch (S3) is connected to a positive pole of the charging and discharging cabinet; a fourth switch (S4), wherein a first end of the fourth switch (S4) is connected to a charging negative relay of the battery system, and a second end of the fourth switch (S4) is connected to a negative pole of the charging and discharging cabinet; and a controller configured to control the closing and opening of the first switch (S1), the second switch (S2), the third switch (S3) and the fourth switch (S4).

[0046] The main positive relay and the main negative relay are located in the main circuit, and the charging positive relay and the charging negative relay are located in the charging circuit. The main positive relay and the main negative relay are used to control the high-voltage main circuit between the battery system and the load or power supply to improve the safety of energy transmission. The charging positive relay and the charging negative relay are used to control the charging circuit between the battery system and the charging equipment to improve the safety of the charging process. The main positive relay and the main negative relay can be called the discharge positive relay and the discharge negative relay, and the main circuit can also be called the discharge circuit.

[0047] By using the battery system test device in the above embodiment, by adding a controller and the first switch (S1) to the fourth switch (S4) during the test process, it is possible to switch between the discharge high-voltage circuit and the charging high-voltage circuit during the battery system test process, thereby avoiding the tester from frequently participating in high-voltage connection and disconnection operations, thereby improving the safety of the test process and the test efficiency.

[0048] Figure 2 A schematic diagram showing a testing device for a battery system according to some embodiments of the present disclosure is shown.

[0049] like Figure 2 As shown, the test device includes, for example, a high-voltage transfer box (HVBOX) and a controller (BOX_ECU) of the transfer box. The high-voltage transfer box includes, for example, a first switch (S1) to a fourth switch (S4). The first end of the first switch (S1) is connected to the main positive relay of the battery system, that is, the first end of the first switch (S1) is connected to the positive input and output point of the main circuit of the battery system. Similarly, the first end of the second switch (S2) is connected to the negative input and output point of the main circuit of the battery system, the first end of the third switch (S3) is connected to the positive input and output point of the charging circuit of the battery system, and the first end of the fourth switch (S4) is connected to the negative input and output point of the charging circuit of the battery system.

[0050] In the case of testing only charging and discharging, you can only set Figure 2 In the embodiment of the present disclosure, switches S1-S4 are not limited to whether switches S5-S6 are set. If switches S5 and S6 are set, then when only charging and discharging are tested, S5 and S6 are in the disconnected state.

[0051] In some embodiments, the controller includes: an output port for a positive signal of a low-voltage auxiliary power source; an output port for a charging connection confirmation signal, for example Figure 2 The A+ wake-up source port and the charging connection signal (CC2) port.

[0052] In some embodiments, the controller includes: an output port for an ignition switch-on status signal, such as Figure 2 The KL15 port in the

[0053] In some embodiments, the controller communicates with the charging and discharging cabinet through a first bus channel via a controller area network; the controller communicates with the battery system through a second bus channel and a third bus channel.

[0054] For example, BOX_ECU includes a controller area network (CAN) communication module, a switch control module, and a national standard fast charging logic control module. CAN1, CAN2, and CAN3 refer to different CAN bus channels, namely the first bus channel, the second bus channel, and the third bus channel. The CAN1 channel of the CAN communication module receives the charging mode information or the discharging mode information sent by the charging and discharging cabinet, and processes the relevant information and sends it to the switch control module. The switch control module controls the opening and closing of the corresponding switches (S1, S2, S3, and S4) and the selection of the BMS wake-up source according to the received charging and discharging mode information.

[0055] After the national standard fast charging logic control module detects the A+ wake-up source and the charging connection signal (CC2), it starts the information interaction of the national standard fast charging logic with the BMS through the CAN2 channel of the CAN communication module (confirming the physical connection status, charging handshake confirmation, charging parameter configuration, energy transmission, and charging end in sequence), and sends the BMS's request charging current and other information to the charging and discharging cabinet through the CAN1 channel of the CAN communication module. The charging and discharging cabinet outputs current according to the received request current information. The CAN3 channel of the CAN communication module receives the battery voltage, temperature, state of charge (SOC) and other information sent by the BMS, and sends the corresponding information to the charging and discharging cabinet through the CAN1 channel of the CAN communication module after processing.

[0056] Figure 3 A schematic diagram showing a testing device for a battery system according to some other embodiments of the present disclosure is shown.

[0057] like Figure 3 As shown, the first end of the main positive relay is connected to the positive electrode of the battery system, and the second end of the main positive relay is connected to the first end of the first switch (S1); the first end of the main negative relay is connected to the negative electrode of the battery system, and the second end of the main negative relay is connected to the first end of the second switch (S2); the first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch (S3); the first end of the charging negative relay is connected to the negative electrode of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch (S4).

[0058] A fuse may also be provided between the main positive relay and the battery system.

[0059] In some embodiments, the testing device for the battery system further includes: a fifth switch (S5), wherein a first end of the fifth switch (S5) is connected to a positive electrode of the battery system; a second end of the fifth switch (S5) is connected to a second end of the first switch (S1) and / or a second end of the fifth switch (S5) is connected to a second end of the third switch (S3); and the controller is further configured to control the closing and opening of the fifth switch (S5).

[0060] For example Figure 3 As shown, when S5 and S1 are both closed, the positive voltage of the battery system can be conducted to the second end of the main positive relay, thereby simulating a main positive relay sticking fault.

[0061] It is difficult for the test devices of the related art to simulate various failure modes during the design verification (DV) and product verification (PV) stages of the battery system, resulting in incomplete test verification of the battery system. The following introduces the failure simulation and testing methods according to some embodiments of the present disclosure.

[0062] In some embodiments, the battery system test device further includes: a sixth switch (S6), a first end of the sixth switch (S6) connected to a second end of the fourth switch (S4) and / or a first end of the sixth switch (S6) connected to a second end of the second switch (S2); a second end of the sixth switch (S6) connected to a negative electrode of the battery system; and the controller is further configured to control the closing and opening of the sixth switch (S6). Figure 3 As shown, when S6 and S2 are both closed, the negative voltage of the battery system can be conducted to the second end of the main negative relay, thereby simulating a main negative relay adhesion fault.

[0063] That is to say, by controlling the opening and closing of multiple switches, the battery system voltage is transmitted to the high-voltage sampling end of each relay of the battery system, realizing the adhesion fault simulation of each relay of the battery system. The first switch (S1) to the sixth switch (S6) can be manually controlled by the switch control module, or by the controller. By controlling the switch to simulate the relay fault injection, a more comprehensive performance verification is achieved in the battery system design verification (DV) and product verification (PV) stages.

[0064] The first switch (S1) to the sixth switch (S6) are, for example, electrically controlled switches. Figure 3 The switch status detection power supply port (S_St_Power) and S1 status port (S1_St_IN) of BOX_ECU are respectively connected to the two ends of the relay controlling S1. The voltage of the S1 status port can be used to determine whether S1 has been opened or closed according to the control command, and the same is true for other switches.

[0065] Figure 4 A flow chart showing a method for testing a battery system according to some embodiments of the present disclosure is shown.

[0066] like Figure 4 As shown, the battery system testing method includes: step 1, using the battery system testing device according to some embodiments of the present disclosure to perform charging and discharging tests on the battery system.

[0067] In some embodiments, the battery system is charged and discharged, including: the controller controls the first switch (S1) and the second switch (S2) to close, and the third switch (S3) and the fourth switch (S4) to disconnect, so as to perform a discharge test on the battery system. For example, the controller controls the first switch (S1) and the second switch (S2) to close, and the third switch (S3) and the fourth switch (S4) to disconnect, and switches to the main circuit to test whether there is a fault during the discharge process.

[0068] In some embodiments, the first switch (S1) and the second switch (S2) are controlled to be closed, and the third switch (S3) and the fourth switch (S4) are controlled to be opened to perform a discharge test on the battery system, including: the controller receives discharge test mode information from the charge and discharge cabinet; the controller controls the first switch (S1) and the second switch (S2) to be closed, and the third switch (S3) and the fourth switch (S4) to be opened according to the discharge test mode information; and the controller outputs an ignition switch on state signal.

[0069] For example, follow the steps below to perform a discharge test.

[0070] Step 11: Discharge mode information is sent. The battery charging and discharging cabinet is set to discharge mode and the mode information is sent to BOX_ECU via the CAN bus.

[0071] Step 12: Switch closure and wake-up source output. The switch control module of BOX_ECU controls the first switch (S1) and the second switch (S2) to close according to the discharge mode information received by the CAN1 channel, and outputs the KL15 wake-up signal to the BMS. For example, Figure 3 A switch is provided between KL30 and KL15. After receiving the discharge mode information, the switch control module of BOX_ECU controls the switch to close, thereby outputting the input voltage of KL30 from the KL15 port to the power supply system.

[0072] Step 13: Discharge to high voltage process. BMS executes the battery system discharge to high voltage process according to the received KL15 signal.

[0073] Step 14: Battery status information exchange. BOX_ECU sends the voltage, temperature, state of charge and other information sent by BMS on CAN3 channel to the battery charging and discharging cabinet through CAN1 channel. The charging and discharging cabinet sets the discharge current according to the actual test conditions.

[0074] Step 15: Discharge ends. The BMS or battery charge and discharge cabinet determines that discharge ends based on the battery status information, and the BMS executes the discharge under high voltage process, and the battery charge and discharge cabinet exits the discharge mode.

[0075] In some embodiments, charging and discharging tests are performed on a battery system, including: a controller controls a first switch (S1) and a second switch (S2) to be opened, and a third switch (S3) and a fourth switch (S4) to be closed, so as to perform a charging test on the battery system.

[0076] For example, the controller controls the first switch (S1) and the second switch (S2) to be disconnected, and the third switch (S3) and the fourth switch (S4) to be closed, switching to the charging circuit to test whether there is a fault during the charging process.

[0077] In some embodiments, the controller controls the first switch (S1) and the second switch (S2) to be disconnected, and the third switch (S3) and the fourth switch (S4) to be closed, so as to perform a charging test on the battery system, including: the controller receives the charging test mode information of the charging and discharging cabinet; the controller controls the first switch (S1) and the second switch (S2) to be disconnected, and the third switch (S3) and the fourth switch (S4) to be closed according to the charging test mode information; the controller outputs the positive pole signal of the low-voltage auxiliary power supply and the charging connection confirmation signal; the controller and the battery system exchange the first DC charging information; the controller and the charging and discharging cabinet exchange the second DC charging information; the charging and discharging cabinet charges the battery system.

[0078] For example, follow the steps below to perform a DC charging test.

[0079] Step 21: Send charging mode information. The battery charging and discharging cabinet is set to charging mode and sends the mode information to BOX_ECU via the CAN bus.

[0080] Step 22: Switch closure and wake-up source output. The switch control module of BOX_ECU controls the third switch (S3) and the fourth switch (S4) to close according to the charging mode information received by the CAN1 channel, and outputs the A+ wake-up source and the charging connection signal CC2. The A+ wake-up source and the charging connection signal CC2 are output to the BMS.

[0081] Step 23: National standard fast charging logic information interaction. After the national standard fast charging logic control module of BOX_ECU detects the A+ and CC2 signals, it starts the information interaction of the national standard fast charging logic with BMS through the CAN2 channel. For example, the physical connection status confirmation, charging handshake confirmation, charging parameter configuration, energy transmission, and charging end information interaction are carried out in sequence.

[0082] Step 24: Battery status information interaction. BOX_ECU sends the requested charging current and other information sent by BMS on CAN2 channel and the voltage, temperature, SOC and other information sent by BMS on CAN3 channel to the battery charging and discharging cabinet through CAN1 channel. The charging and discharging cabinet outputs current according to the received requested charging current information.

[0083] Step 25: Charging ends. The BMS or battery charging and discharging cabinet determines that charging is ended based on the battery status information, and the BMS executes the charging low-voltage process, and the battery charging and discharging cabinet exits the charging mode.

[0084] In the related art, the battery charging and discharging cabinet does not have the DC fast charging simulation function. The solution of a separate battery charging and discharging cabinet cannot realize the DC fast charging test and verification of the battery system. In terms of the comprehensive coverage of the test and verification, it is necessary to replace the battery charging and discharging cabinet with the DC fast charging simulation function, such as Figure 1a However, the economic cost of replacing the test equipment is too high for the tester.

[0085] The combination of DC charging piles and battery charging and discharging cabinets in the related art can realize DC fast charging test verification and discharge test verification of the battery system respectively. However, with the continuous development of DC fast charging technical specifications and standards and the increase in the charging power demand of the battery system, DC charging piles will face the situation of equipment renewal and re-purchase, thereby increasing the economic cost of testing and verification.

[0086] At the same time, the charging and discharging processes of the entire test and verification activity are implemented through national standard charging piles and battery charging and discharging cabinets respectively, involving frequent high-voltage connection and disconnection operations, which reduces the efficiency of test and verification and increases the probability of high-voltage safety accidents for relevant personnel. In addition, the output current of the DC charging pile cannot be set manually, so the fault injection of the charging current cannot be achieved during the test, resulting in an incomplete test.

[0087] According to some embodiments of the present disclosure, the national standard DC fast charging test can be implemented in the form of a physical battery system, eliminating the difference between the test results caused by the accuracy limitation of the HIL DC fast charging simulation model and the physical test results of the battery system, thereby improving the reliability of the test results. Moreover, by adding a controller and its communication function, it is possible to replace the DC charging pile and to use a battery charging and discharging cabinet that does not have a DC fast charging simulation function to implement the national standard DC fast charging test of the battery system, thereby avoiding the economic costs caused by equipment updates. Even with the continuous development of DC fast charging technical specifications and standards, users only need to update the software of the controller BOX_ECU provided by the present disclosure, thereby reducing hardware equipment costs.

[0088] In some embodiments, the testing method of the battery system also includes: the controller controls the first switch (S1) and the fifth switch (S5) to close, wherein the first end of the fifth switch (S5) is connected to the positive electrode of the battery system, the second end of the fifth switch (S5) is connected to the second end of the first switch (S1), the first end of the main positive relay is connected to the positive electrode of the battery system, and the second end of the main positive relay is connected to the first end of the first switch (S1); the battery system executes a process from a state without high-voltage output to a state with high-voltage output.

[0089] For example, the first switch (S1) and the fifth switch (S5) are first closed through the switch control module of BOX_ECU to simulate the adhesion failure of the main positive relay, and the main positive relay is in the disconnected state. Then, the BMS executes the process of entering the high-voltage output state from the non-high-voltage output state (i.e., the high-voltage discharge process), so as to test whether the BMS can identify the adhesion failure of the main positive relay in the process. The states of other switches and relays can be controlled according to the test needs. For example, the main positive relay failure and the main negative relay failure can be tested at the same time, and the embodiments of the present disclosure are not limited to this.

[0090] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a state with high voltage output from a state without high voltage output; the controller controls the first switch (S1) and the fifth switch (S5) to be closed, wherein the first end of the fifth switch (S5) is connected to the positive electrode of the battery system, the second end of the fifth switch (S5) is connected to the second end of the first switch (S1), the first end of the main positive relay is connected to the positive electrode of the battery system, and the second end of the main positive relay is connected to the first end of the first switch (S1); the battery system executes a process of entering a state without high voltage output from a state with high voltage output.

[0091] For example, the BMS first executes the discharge high voltage process and enters the discharge state (the main positive relay and the main negative relay are in the closed state). Then, the switch control module of the BOX_ECU closes the first switch (S1) and the fifth switch (S5) to simulate the adhesion failure of the main positive relay. At this time, the main positive relay and the main negative relay are still in the closed state. Then, the BMS executes the process from the high voltage output state to the non-high voltage output state (that is, the discharge high voltage process), so as to test whether the BMS can identify the adhesion failure of the main positive relay in this process.

[0092] In some embodiments, the testing method of the battery system also includes: the controller controls the second switch (S2) and the sixth switch (S6) to close, wherein the first end of the sixth switch (S6) is connected to the second end of the second switch (S2), the second end of the sixth switch (S6) is connected to the negative electrode of the battery system, the first end of the main negative relay is connected to the negative electrode of the battery system, and the second end of the main negative relay is connected to the first end of the second switch (S2); the battery system executes a process from a state without high-voltage output to a state with high-voltage output.

[0093] For example, the switch control module of BOX_ECU closes the second switch (S2) and the sixth switch (S6) to simulate the main negative relay adhesion fault, and the main negative relay is disconnected. Then, the BMS performs the discharge high voltage process to test whether the BMS can identify the main negative relay adhesion fault in the process.

[0094] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a state with high voltage output from a state without high voltage output; the controller controls the second switch (S2) and the sixth switch (S6) to close, wherein the first end of the sixth switch (S6) is connected to the second end of the second switch (S2), the second end of the sixth switch (S6) is connected to the negative pole of the battery system, the first end of the main negative relay is connected to the negative pole of the battery system, and the second end of the main negative relay is connected to the first end of the second switch (S2); the battery system executes a process of entering a state without high voltage output from a state with high voltage output.

[0095] For example, the BMS first executes the discharge high voltage process and enters the discharge state (in the discharge state, the main positive relay and the main negative relay are in the closed state). Then, the switch control module of the BOX_ECU closes the second switch (S2) and the sixth switch (S6) to simulate the main negative relay adhesion fault. At this time, the main positive relay and the main negative relay are in the closed state. Then, the BMS executes the discharge low voltage process to test whether the BMS can identify the adhesion fault of the main negative relay in this process.

[0096] In some embodiments, the testing method of the battery system also includes: the controller controls the third switch (S3) and the fifth switch (S5) to close, wherein the first end of the fifth switch (S5) is connected to the positive electrode of the battery system, the second end of the fifth switch (S5) is connected to the second end of the third switch (S3), the first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch (S3); the battery system executes a process of entering a charging state from a no high voltage output state.

[0097] For example, the switch control module of BOX_ECU closes the third switch (S3) and the fifth switch (S5) to simulate the adhesion fault of the positive charging relay, and the positive charging relay is disconnected. Then, the BMS executes the process of entering the DC charging state from the no high-voltage output state (i.e., the high-voltage charging process), so as to test whether the BMS can identify the adhesion fault of the positive charging relay in this process.

[0098] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a charging state from a state without high voltage output; the controller controls the third switch (S3) and the fifth switch (S5) to be closed, wherein the first end of the fifth switch (S5) is connected to the positive electrode of the battery system, the second end of the fifth switch (S5) is connected to the second end of the third switch (S3), the first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch (S3); the battery system executes a process of entering a state without high voltage output from a charging state.

[0099] For example, the BMS executes the charging high voltage process and enters the charging state (at this time, the main positive relay, the main negative relay, the charging positive relay and the charging negative relay are in the closed state). Then, the charging positive relay adhesion fault is simulated, and the third switch (S3) and the fifth switch (S5) are closed through the switch control module of the BOX_ECU. Then, the BMS executes the process of entering the no high voltage output state from the DC charging state (that is, the charging low high voltage process), so as to test whether the BMS can identify the adhesion fault of the charging positive relay in this process.

[0100] In some embodiments, the testing method of the battery system further includes: the controller controls the fourth switch (S4) and the sixth switch (S6) to close, wherein the first end of the sixth switch (S6) is connected to the second end of the fourth switch (S4), the second end of the sixth switch (S6) is connected to the negative electrode of the battery system, the first end of the charging negative relay is connected to the negative electrode of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch (S4); the battery system executes a process of entering a charging state from a no high voltage output state.

[0101] For example, the switch control module of BOX_ECU closes the fourth switch (S4) and the sixth switch (S6) to simulate the adhesion fault of the negative charging relay. Then, the BMS performs the high-voltage charging process to test whether the BMS can identify the adhesion fault of the negative charging relay in the process.

[0102] In some embodiments, the testing method of the battery system also includes: the battery system executes a process of entering a charging state from a state without high voltage output; the controller controls the fourth switch (S4) and the sixth switch (S6) to be closed, wherein the first end of the sixth switch (S6) is connected to the second end of the fourth switch (S4), the second end of the sixth switch (S6) is connected to the negative electrode of the battery system, the first end of the charging negative relay is connected to the negative electrode of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch (S4); the battery system executes a process of entering a state without high voltage output from a charging state.

[0103] For example, the BMS first executes the charging high voltage process and enters the charging state (at this time, the main positive relay, the main negative relay, the charging positive relay and the charging negative relay are in the closed state). Then, the switch control module of the BOX_ECU closes the fourth switch (S4) and the sixth switch (S6) to simulate the adhesion failure of the charging negative relay. Then, the BMS executes the charging low voltage process to test whether the BMS can identify the adhesion failure of the charging negative relay in this process.

[0104] The present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

[0105] Those skilled in the art will appreciate that, in the description of the method steps in the above embodiments, the order in which the steps are actually executed is not strictly limited, and the order in which the steps are executed in actual operation may be adjusted according to functional requirements and internal logical relationships.

[0106] In the above description of various embodiments, the differences between different embodiments are emphasized, and the same points or similarities between various embodiments can be understood by reference to each other. To keep it simple, no repeated description will be given.

[0107] The battery system testing device and method in the above embodiments improve the safety and efficiency of the testing process.

[0108] So far, the testing device and method of the battery system according to the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

Claims

1. A battery system testing device, comprising: A first switch, wherein a first end of the first switch is connected to a main positive relay of the battery system, and a second end of the first switch is connected to a positive electrode of the charging and discharging cabinet; A second switch, wherein a first end of the second switch is connected to a main negative relay of the battery system, and a second end of the second switch is connected to a negative electrode of the charging and discharging cabinet; A third switch, wherein a first end of the third switch is connected to a positive charging relay of the battery system, and a second end of the third switch is connected to a positive electrode of the charging and discharging cabinet; A fourth switch, wherein a first end of the fourth switch is connected to a negative charging relay of the battery system, and a second end of the fourth switch is connected to a negative electrode of the charging and discharging cabinet; The controller is configured to control the closing and opening of the first switch, the second switch, the third switch and the fourth switch.

2. The battery system testing device according to claim 1, wherein: The controller comprises: Output port of the positive signal of the low-voltage auxiliary power supply; Output port for charging connection confirmation signal.

3. The battery system testing device according to claim 1, wherein: The controller comprises: Output port for the ignition switch on status signal.

4. The battery system testing device according to claim 1, wherein: The controller communicates with the charging and discharging cabinet via a first bus channel via a controller area network; The controller communicates with the battery system via a second bus channel and a third bus channel.

5. The battery system testing device according to claim 1, wherein: A first end of the main positive relay is connected to the positive electrode of the battery system, and a second end of the main positive relay is connected to the first end of the first switch; The first end of the main negative relay is connected to the negative electrode of the battery system, and the second end of the main negative relay is connected to the first end of the second switch; The first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch; A first end of the negative charging relay is connected to the negative electrode of the battery system, and a second end of the negative charging relay is connected to the first end of the fourth switch.

6. The battery system testing device according to claim 1, further comprising: a fifth switch, wherein a first end of the fifth switch is connected to a positive electrode of the battery system; The second end of the fifth switch is connected to the second end of the first switch and / or the second end of the fifth switch is connected to the second end of the third switch; The controller is further configured to control the closing and opening of the fifth switch.

7. The battery system testing device according to claim 1, further comprising: a sixth switch, wherein a first end of the sixth switch is connected to a second end of the fourth switch and / or a first end of the sixth switch is connected to a second end of the second switch; The second end of the sixth switch is connected to the negative electrode of the battery system; The controller is further configured to control the closing and opening of the sixth switch.

8. A method for testing a battery system, comprising: Using the battery system testing device according to any one of claims 1 to 7, the battery system is subjected to charging and discharging tests.

9. The battery system testing method according to claim 8, wherein: The charging and discharging test of the battery system comprises: The controller controls the first switch and the second switch to be closed, and the third switch and the fourth switch to be opened, so as to perform a discharge test on the battery system.

10. The battery system testing method according to claim 8, wherein: The controlling the first switch and the second switch to be closed and the third switch and the fourth switch to be opened to perform a discharge test on the battery system includes: The controller receives the discharge test mode information of the charge and discharge cabinet; The controller controls the first switch and the second switch to be closed, and the third switch and the fourth switch to be opened according to the discharge test mode information; The controller outputs an ignition switch on state signal.

11. The battery system testing method according to claim 8, wherein: The charging and discharging test of the battery system comprises: The controller controls the first switch and the second switch to be opened, and the third switch and the fourth switch to be closed, so as to perform a charging test on the battery system.

12. The battery system testing method according to claim 11, wherein: The controller controls the first switch and the second switch to be opened, and the third switch and the fourth switch to be closed, so as to perform a charging test on the battery system, including: The controller receives the charging test mode information of the charging and discharging cabinet; The controller controls the first switch and the second switch to be opened, and the third switch and the fourth switch to be closed according to the charging test mode information; The controller outputs a positive signal of the low-voltage auxiliary power supply and a charging connection confirmation signal; The controller and the battery system exchange first DC charging information; The controller and the charging and discharging cabinet exchange the second DC charging information; The charging and discharging cabinet charges the battery system.

13. The battery system testing method according to claim 8, further comprising: The controller controls the first switch and the fifth switch to be closed, wherein the first end of the fifth switch is connected to the positive electrode of the battery system, the second end of the fifth switch is connected to the second end of the first switch, the first end of the main positive relay is connected to the positive electrode of the battery system, and the second end of the main positive relay is connected to the first end of the first switch; The battery system executes a process from a state without high voltage output to a state with high voltage output.

14. The method for testing a battery system according to claim 8, further comprising: The battery system executes a process from a state without high voltage output to a state with high voltage output; The controller controls the first switch and the fifth switch to be closed, wherein the first end of the fifth switch is connected to the positive electrode of the battery system, the second end of the fifth switch is connected to the second end of the first switch, the first end of the main positive relay is connected to the positive electrode of the battery system, and the second end of the main positive relay is connected to the first end of the first switch; The battery system executes a process from a state with high voltage output to a state without high voltage output.

15. The battery system testing method according to claim 8, further comprising: The controller controls the second switch and the sixth switch to be closed, wherein the first end of the sixth switch is connected to the second end of the second switch, the second end of the sixth switch is connected to the negative electrode of the battery system, the first end of the main negative relay is connected to the negative electrode of the battery system, and the second end of the main negative relay is connected to the first end of the second switch; The battery system executes a process from a state without high voltage output to a state with high voltage output.

16. The battery system testing method according to claim 8, further comprising: The battery system executes a process from a state without high voltage output to a state with high voltage output; The controller controls the second switch and the sixth switch to be closed, wherein the first end of the sixth switch is connected to the second end of the second switch, the second end of the sixth switch is connected to the negative electrode of the battery system, the first end of the main negative relay is connected to the negative electrode of the battery system, and the second end of the main negative relay is connected to the first end of the second switch; The battery system executes a process from a state with high voltage output to a state without high voltage output.

17. The method for testing a battery system according to claim 8, further comprising: The controller controls the third switch and the fifth switch to be closed, wherein the first end of the fifth switch is connected to the positive electrode of the battery system, the second end of the fifth switch is connected to the second end of the third switch, the first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch; The battery system executes the process from no high voltage output state to charging state.

18. The battery system testing method according to claim 8, further comprising: The battery system executes the process of entering the charging state from the no high voltage output state; The controller controls the third switch and the fifth switch to be closed, wherein the first end of the fifth switch is connected to the positive electrode of the battery system, the second end of the fifth switch is connected to the second end of the third switch, the first end of the charging positive relay is connected to the positive electrode of the battery system, and the second end of the charging positive relay is connected to the first end of the third switch; The battery system executes the process from the charging state to the no high voltage output state.

19. The battery system testing method according to claim 8, further comprising: The controller controls the fourth switch and the sixth switch to be closed, wherein the first end of the sixth switch is connected to the second end of the fourth switch, the second end of the sixth switch is connected to the negative electrode of the battery system, the first end of the charging negative relay is connected to the negative electrode of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch; The battery system executes the process from no high voltage output state to charging state.

20. The battery system testing method according to claim 8, further comprising: The battery system executes the process of entering the charging state from the no high voltage output state; The controller controls the fourth switch and the sixth switch to be closed, wherein the first end of the sixth switch is connected to the second end of the fourth switch, the second end of the sixth switch is connected to the negative electrode of the battery system, the first end of the charging negative relay is connected to the negative electrode of the battery system, and the second end of the charging negative relay is connected to the first end of the fourth switch; The battery system executes the process from the charging state to the no high voltage output state.

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