A switching current direction testing device

Abstract

This utility model relates to the field of testing device technology, specifically a current direction switching testing device, including a battery monitoring and management system (BMS), a DC power supply, and a microcontroller unit (MCU), as well as a charging drive circuit and a discharging drive circuit. The charging drive circuit controls the direction of the charging current, and the discharging drive circuit controls the direction of the discharging current. The BMS includes a current-sensing resistor R, one end of which is connected to the P- interface of the BMS, and the other end is connected to the B- interface. This utility model controls the direction of the charging current through charging control relays K1 and K3, achieving automatic testing and fault diagnosis; and controls the direction of the discharging current through discharging control relays K2 and K4, achieving automatic testing and fault diagnosis. This testing device does not require separate connections to charging and discharging equipment, is simple to operate, and highly efficient.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to a current direction switching testing device. Background Technology

[0002] A Battery Management System (BMS) is an electronic system used to monitor, control, and protect battery packs. Testing a BMS typically involves charge-discharge tests to verify its performance and reliability. Existing testing equipment usually requires separate connections to charging and discharging devices. If the charging current causes overvoltage protection, the charger must be removed and replaced with a load to discharge and verify if the discharge current can release the protection. Similarly, after discharging to verify overcurrent protection, the load must be removed and replaced with a charger to verify if the charging current can release the overcurrent protection. This process is complex and inefficient. Therefore, there is an urgent need for a testing device capable of rapidly switching the current direction to improve testing efficiency and accuracy. Summary of the Invention

[0003] The main objective of this invention is to provide a current direction switching testing device to solve the problems raised in related technologies.

[0004] To achieve the above objectives, according to one aspect of the present invention, a current direction switching test device is provided, including a battery monitoring and management system (BMS), a DC power supply (DC), and a microcontroller unit (MCU), and further including a charging drive circuit and a discharging drive circuit, wherein the charging drive circuit is used to control the direction of the charging current, and the discharging drive circuit is used to control the direction of the discharging current.

[0005] Furthermore, the battery monitoring and management system (BMS) is equipped with a current sensing resistor R. One end of the current sensing resistor R is connected to the P- interface of the battery monitoring and management system (BMS), and the other end is connected to the B- interface of the battery monitoring and management system (BMS).

[0006] Furthermore, the charging drive circuit includes a charging control relay K1 and a charging control relay K3.

[0007] Furthermore, the charging control relay K1 is connected in series between the positive terminal of the DC power supply and the P- interface of the battery monitoring and management system (BMS).

[0008] Furthermore, the charging control relay K3 is connected in series between the negative terminal of the DC power supply and the B- interface of the battery monitoring and management system (BMS).

[0009] Furthermore, the discharge drive circuit includes a discharge control relay K2 and a discharge control relay K4.

[0010] Furthermore, the discharge control relay K2 is connected in series between the positive terminal of the DC power supply and the B- interface of the battery monitoring and management system (BMS).

[0011] Furthermore, the discharge control relay K4 is connected in series between the negative terminal of the DC power supply and the P- interface of the battery monitoring and management system (BMS).

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention uses charging control relays K1 and K3 to control the direction of the charging current, achieving automatic testing and fault termination; and uses discharging control relays K2 and K4 to control the direction of the discharging current, achieving automatic testing and fault termination. This testing device does not require separate connections to charging and discharging equipment, is simple to operate, and highly efficient. Attached Figure Description

[0013] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0014] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0015] This embodiment provides a current direction switching test device, such as... Figure 1 As shown, it includes a battery monitoring and management system (BMS), a DC power supply (DC), and a microcontroller unit (MCU). It also includes a charging drive circuit and a discharging drive circuit. The charging drive circuit is used to control the direction of the charging current, and the discharging drive circuit is used to control the direction of the discharging current.

[0016] In this embodiment, the microcontroller unit (MCU) is preferably the STM32H7 series manufactured by STMicroelectronics Co., Ltd. This series of MCUs has a dual-core architecture and supports AI inference and real-time control.

[0017] The microcontroller unit (MCU) is connected to the host computer via the RS485 serial communication standard. The host computer sets test parameters such as charge / discharge switching time, test interval, secondary protection judgment conditions, and waiting time.

[0018] The microcontroller unit (MCU) internally programs test programs, supports programmable testing, is compatible with automated testing systems, and is used to automatically perform functional tests.

[0019] The battery monitoring and management system (BMS) is equipped with a current sensing resistor R. One end of the current sensing resistor R is connected to the P- interface of the battery monitoring and management system (BMS), and the other end is connected to the B- interface of the battery monitoring and management system (BMS).

[0020] The current sensing resistor R is used to detect the charging current of the charging drive circuit and the discharging current of the discharging drive circuit. The detected current signal is fed back to the microcontroller unit (MCU) to monitor and protect the battery and prevent abnormal conditions such as overcharging and over-discharging.

[0021] The charging drive circuit includes charging control relay K1 and charging control relay K3.

[0022] The charging control relay K1 is connected in series between the positive terminal of the DC power supply and the P- interface of the battery monitoring and management system (BMS).

[0023] The charging control relay K3 is connected in series between the negative terminal of the DC power supply and the B- interface of the battery monitoring and management system (BMS).

[0024] The discharge drive circuit includes discharge control relay K2 and discharge control relay K4.

[0025] The discharge control relay K2 is connected in series between the positive terminal of the DC power supply and the B- interface of the battery monitoring and management system (BMS).

[0026] The discharge control relay K4 is connected in series between the negative terminal of the DC power supply and the P- interface of the battery monitoring and management system (BMS).

[0027] Connect to a DC power supply, set the test parameters via the host computer, and start the automatic current test.

[0028] Charging current implementation: After the battery monitoring and management system (BMS) is powered on normally, the host computer sends a message through the RS485 serial communication standard. The microcontroller unit (MCU) controls the charging control relays K1 and K3 to close, while the discharging control relays K2 and K4 are in the open state. The DC power supply current is output from the positive terminal, passes through the charging control relay K1 to the P- interface of the battery monitoring and management system (BMS), then flows from the B- interface of the battery monitoring and management system (BMS) into the charging control relay K3, and finally returns to the negative terminal of the DC power supply, completing the charging current loop.

[0029] Implementation of discharge current: The host computer sends a message through the RS485 serial communication standard, and the microcontroller unit (MCU) controls the charging control relays K1 and K3 to open, while simultaneously closing the discharge control relays K2 and K4. The DC power supply outputs current from the positive terminal, passes through the discharge control relay K2 to the B- interface of the battery monitoring and management system (BMS), then flows from the P- interface of the BMS into the discharge control relay K4, and finally returns to the negative terminal of the DC power supply, completing the discharge current loop.

[0030] Charging control relays K1 and K3 control the direction of the charging current. The microcontroller unit (MCU) controls the closing of these relays, enabling automatic testing and fault diagnosis. Similarly, discharging control relays K2 and K4 control the direction of the discharging current. The MCU also controls their closing, achieving automatic testing and fault diagnosis. This testing device eliminates the need for separate connections to charging and discharging equipment, simplifying operation and increasing efficiency.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A current direction switching test device, comprising a battery monitoring and management system (BMS), a DC power supply (DC), and a microcontroller unit (MCU), characterized in that, It also includes a charging drive circuit and a discharging drive circuit, wherein the charging drive circuit is used to control the direction of the charging current and the discharging drive circuit is used to control the direction of the discharging current.

2. The current direction switching testing device according to claim 1, characterized in that, The battery monitoring and management system (BMS) is equipped with a current sensing resistor R. One end of the current sensing resistor R is connected to the P- interface of the battery monitoring and management system (BMS), and the other end is connected to the B- interface of the battery monitoring and management system (BMS).

3. The current direction switching testing device according to claim 1, characterized in that, The charging drive circuit includes a charging control relay K1 and a charging control relay K3.

4. The current direction switching testing device according to claim 3, characterized in that, The charging control relay K1 is connected in series between the positive terminal of the DC power supply and the P- interface of the battery monitoring and management system (BMS).

5. The current direction switching testing device according to claim 3, characterized in that, The charging control relay K3 is connected in series between the negative terminal of the DC power supply and the B- interface of the battery monitoring and management system (BMS).

6. The switching current direction testing device according to claim 1, characterized in that, The discharge drive circuit includes a discharge control relay K2 and a discharge control relay K4.

7. The current direction switching testing device according to claim 6, characterized in that, The discharge control relay K2 is connected in series between the positive terminal of the DC power supply and the B- interface of the battery monitoring and management system (BMS).

8. The current direction switching testing device according to claim 6, characterized in that, The discharge control relay K4 is connected in series between the negative terminal of the DC power supply and the P- interface of the battery monitoring and management system (BMS).

Images