Battery short circuit test tool detection circuit

Abstract

The invention relates to a battery short circuit test tool detection circuit, which comprises a tested BMS board, an air switch and a short circuit test tool, and is characterized in that the short circuit test tool comprises a test switch module, a control module, a switch driving module and a switch management module; the tested BMS board, the air switch and the switch management module are connected in series to form a detection loop, the signal output end of the test switch module is connected with the signal input end of the control module, and the signal output end of the control module is connected with the signal input end of the switch driving module. The signal output end of the switch driving module is connected with the signal input end of the switch management module; complex operation of manually building a short-circuit environment in a traditional manual testing process is avoided, so that the testing result is more stable and reliable, personal errors are reduced, and the accuracy of product quality detection is improved.

Description

Technical Field

[0001] The invention relates to the technical field of battery short-circuit testing, and in particular to a battery short-circuit testing tool detection circuit. Background Art

[0002] At present, in the detection process of battery short-circuit protection module, traditional test methods mainly rely on manual operation and manual measurement, and there are many technical bottlenecks and limitations. First, the test efficiency is low. Manual measurement requires connecting test points one by one and using multimeters, oscilloscopes and other equipment to read key parameters such as voltage and current, resulting in a long test cycle and is not suitable for large-scale production environments. Secondly, the measurement accuracy is unstable. Since traditional manual testing relies on the experience and manual recording of operators, it is easily affected by human errors, instrument drift and environmental interference, resulting in poor data reliability. Furthermore, test data management is difficult. Manual testing usually requires handwritten records or manual entry into the computer, which not only increases the workload of testers, but also may affect product quality traceability due to data omissions or input errors. In addition, safety issues are also a major defect of traditional methods. Short-circuit testing involves high-current transient shocks, and manual operation can easily cause equipment damage or even safety accidents. Therefore, traditional test methods have been difficult to meet the needs of high-precision, high-efficiency and intelligent detection. There is an urgent need for an automated, precise and intelligent test system to improve the detection quality and production efficiency of short-circuit protection modules. Summary of the invention

[0003] In order to solve the problem that traditional testing methods mainly rely on manual operation and manual measurement, resulting in low quality and low efficiency, the present application provides a battery short circuit test fixture detection circuit.

[0004] A battery short-circuit test fixture detection circuit, the battery short-circuit test fixture detection circuit comprising a tested BMS board, an air switch and a short-circuit test fixture, the short-circuit test fixture comprising a test switch module, a control module, a switch drive module and a switch management module, the tested BMS board, the air switch and the switch management module are connected in series to form a detection loop, the signal output end of the test switch module is connected to the signal input end of the control module, the signal output end of the control module is connected to the signal input end of the switch drive module, and the signal output end of the switch drive module is connected to the signal input end of the switch management module; The test switch module allows the tester to manually press the corresponding test switch to generate a corresponding switch signal. After receiving the switch signal, the control module drives the switch management module to be turned on or off through the switch driving module, thereby simulating the corresponding test state.

[0005] By adopting the above technical solution, the test fixture can form a complete battery short-circuit detection circuit, and through a modular control method, the automatic detection of the short-circuit protection module can be realized. The test switch module can be manually pressed by the tester to trigger the switch signal. After receiving the signal, the control module uses the switch drive module to drive the switch management module to be turned on or off to accurately simulate the short-circuit test state. This control method avoids the complex operation of manually setting up a short-circuit environment in the traditional manual testing process, greatly improves the convenience and repeatability of the test, makes the test results more stable and reliable, and reduces human errors, improving the accuracy of product quality inspection.

[0006] Preferably, the control module includes a front-end control chip AFE and an MCU chip, the signal input end of the MCU chip is connected to the signal output end of the test switch module, the data communication end of the MCU chip is connected to the data communication end of the front-end control chip AFE, and the signal output end of the front-end control chip AFE is connected to the signal input end of the switch driving module.

[0007] By adopting the above technical solution, the MCU chip and the front-end control chip AFE can be used to work together to realize intelligent signal processing and short-circuit status monitoring. The MCU chip receives the control signal from the test switch module, and interacts with the AFE chip through the data communication interface, so that the AFE chip monitors the key parameters such as current and voltage in the detection circuit in real time, and feeds the measurement data back to the MCU, and then the MCU drives the switch drive module to perform short-circuit simulation or protection response. In this way, the system can automatically adapt to different test environments, ensure more accurate short-circuit detection, and support data storage and analysis, thereby improving the test reliability of the battery short-circuit protection module.

[0008] Preferably, the signal input end of the MCU chip includes a conduction control signal input port and a disconnection control signal input port, the test switch module includes a conduction control unit and a disconnection control unit, the conduction control unit includes a switch SW2 and a resistor R1, the first end of the resistor R1 is connected to the conduction control signal input port, the second end of the resistor R1 is connected to the first end of the switch SW2, and the second end of the switch SW2 is grounded, the disconnection control unit includes a switch SW3 and a resistor R2, the first end of the resistor R2 is connected to the disconnection control signal input port, the second end of the resistor R1 is connected to the first end of the switch SW3, and the second end of the switch SW3 is grounded.

[0009] By adopting the above technical solution, the control signals for conduction and disconnection can be received respectively through the independent signal input port of the MCU chip, making the control logic of the short-circuit test clearer. The test switch module includes a conduction control unit and a disconnection control unit, wherein the conduction control unit is composed of a switch SW2 and a resistor R1, and the disconnection control unit is composed of a switch SW3 and a resistor R2. When the tester presses different switches, the MCU chip can accurately distinguish between the conduction signal and the disconnection signal, and send corresponding control instructions to the switch drive module to ensure that the test tooling can accurately perform short-circuit simulation and loop cutting operations, thereby enhancing the controllability and safety of the test.

[0010] Preferably, the test switch module includes a reset control unit, which includes a switch SW4, a resistor R3 and a resistor R4, the first end of the resistor R3 is connected to the power supply, the second end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is grounded, a common node between the second end of the resistor R3 and the first end of the resistor R4 is connected to the first end of the switch SW4, and the second end of the SW4 is connected to the reset control signal input end of the MCU chip.

[0011] By adopting the above technical solution, an additional reset control unit can be provided, so that the system can quickly restore to the initial state under abnormal conditions, preventing the system from being locked or misjudged due to erroneous operations. The reset control unit is composed of switch SW4, resistor R3 and resistor R4, forming a stable reset signal generation circuit. When the tester presses the reset switch SW4, the reset control signal input end of the MCU chip will receive a clear reset instruction, so that the entire test system will be reinitialized, thereby ensuring the stable operation of the test fixture and improving the reliability and repeatability of the test process.

[0012] Preferably, a current detection resistor is provided on the detection loop, and the current detection input terminal of the front-end control chip AFE is respectively connected to the two ends of the current detection resistor.

[0013] By adopting the above technical solution, a current-sensing resistor can be added to the detection circuit, so that the AFE chip can accurately detect the size of the short-circuit current. The two ends of the current-sensing resistor are respectively connected to the current detection input of the AFE, so that the AFE chip can monitor the current changes flowing through the detection circuit in real time and accurately judge the response time and protection threshold of the short-circuit protection module. This can effectively improve the accuracy of the short-circuit test and ensure that the battery management system (BMS) can respond quickly when a short circuit occurs, thereby improving the safety performance and quality inspection standards of the product.

[0014] Preferably, the switch driving module includes a resistor R5, a resistor R6 and a driving chip U5, the signal output end of the front-end control chip AFE is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the signal input end of the driving chip U5, the signal output end of the driving chip U5 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the signal input end of the switch management module.

[0015] By adopting the above technical solution, the switch drive module can reasonably distribute and control signal transmission, thereby improving the system response speed and driving efficiency. The switch drive module is composed of resistors R5, R6 and driver chip U5. The signal output end of the AFE chip is connected to the driver chip U5 through R5. After further processing the signal, the U5 chip sends the driving signal to the switch management module through R6. This design can effectively isolate the direct signal transmission between the AFE chip and the switch management module, avoid signal interference, and improve the driving accuracy of the MOS tube, thereby ensuring the accuracy of the short circuit test.

[0016] Preferably, the switch management module includes a resistor R21, a voltage regulator tube ZD3 and multiple MOS switch conduction units, each of the MOS switch conduction units includes at least a first current limiting resistor and a MOS tube, the two conduction ends of the MOS tube are used to be connected to the detection loop, the controlled end of the MOS tube is connected to the first end of the first current limiting resistor, the second end of the first current limiting resistor is connected to the signal output end of the switch driving module, the first end of the resistor R21 is connected to the signal output end of the switch driving module, the second end of the resistor R21 is grounded, the negative end of the voltage regulator tube ZD3 is connected to the signal output end of the switch driving module, and the positive end of the resistor R21 is grounded.

[0017] By adopting the above technical solution, the switch management module can realize efficient control of the short-circuit test and improve the protection performance of the system. The switch management module includes multiple MOS switch conduction units, each of which is composed of a MOS tube and a current limiting resistor, wherein the conduction end of the MOS tube is connected to the detection circuit, and the controlled end is connected to the switch driving module through the current limiting resistor. In addition, the voltage regulator ZD3 can provide a stable control signal during the MOS tube driving process to avoid MOS tube malfunction caused by driving voltage fluctuations, thereby improving the reliability and accuracy of the entire short-circuit test fixture.

[0018] Preferably, the battery short circuit test tool detection circuit also includes a light indication module and a digital tube timing module, the light indication module includes multiple indication units, the indication unit includes at least a second current limiting resistor and a first light emitting diode, the first end of the second current limiting resistor is connected to the light indication signal output end of the MCU chip, the second end of the second current limiting resistor is connected to the positive end of the first light emitting diode, the negative end of the first light emitting diode is grounded, and the signal input end of the digital tube timing module is connected to the timing signal output end of the MCU chip.

[0019] By adopting the above technical solution, intuitive status feedback can be provided during the short-circuit test, so that the tester can understand the working status of the test fixture in real time. The light indication module is composed of multiple LED indication units, and the digital tube timing module is used to display the countdown information of the short-circuit test. The LED indicator can clearly identify the switch status, short-circuit protection status and overcurrent protection status of the MOS tube, and the digital tube timing module can display the remaining time of the test, which is convenient for the tester to prepare in advance and observe the test results, thereby improving the convenience of operation and the visualization level of the test process.

[0020] Preferably, the battery short-circuit test tool detection circuit also includes a capacitor protection module, which is connected between the air switch and the switch management module. The capacitor protection module includes two capacitor modules arranged in parallel, and the capacitor module includes a plurality of polar capacitors arranged in parallel with each other.

[0021] By adopting the above technical solution, the capacitor protection module can reduce the impact current at the moment of short circuit and improve the safety of the test fixture. The capacitor protection module consists of two parallel capacitor modules, each of which contains multiple polarity capacitors set in parallel to improve the energy absorption capacity. When the short-circuit test fixture triggers a short circuit, the capacitor protection module can quickly absorb and buffer the large current at the moment of short circuit, reducing the current impact on the test equipment and BMS board, thereby effectively improving the safety of the system and preventing equipment damage due to short-circuit testing.

[0022] Preferably, the capacitor protection module also includes a capacitor power indication unit, which is arranged in parallel with each of the capacitor modules, and the capacitor power indication unit includes at least a second light-emitting diode and a third current-limiting resistor, the positive terminal of the second light-emitting diode is connected to the positive terminal of the detection circuit, the negative terminal of the second light-emitting diode is connected to the first end of the third current-limiting resistor, and the second end of the third current-limiting resistor is connected to the negative terminal of the detection circuit.

[0023] By adopting the above technical solution, a capacitor charge indication unit can be added to the capacitor protection module, so that the tester can intuitively judge whether the capacitor stores residual charge and avoid safety risks caused by misoperation. The capacitor charge indication unit includes an LED and a current limiting resistor, and is connected in parallel with the capacitor module. When the capacitor still has charge, the LED light will remain on to remind the tester that there is still charge inside the capacitor, preventing the tester from operating when it is not fully discharged, thereby improving the safety of the test environment and reducing the risk of accidentally touching live parts.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application is operated through a test switch module, which provides a human-computer interaction interface, allowing the tester to press the test switch to trigger the test signal, thereby avoiding manual recording and test errors. Once the test signal is triggered, the control module will receive the signal and send instructions to the switch drive module to drive the MOS tube and other switching elements to turn on or off, forming an automated short-circuit test process. This circuit structure not only greatly improves the test efficiency, but also reduces the inconsistency that may be caused by manual operation, and improves the repeatability and reliability of detection; 2. Through the synergy of the control module and the switch management module, it is ensured that during the short-circuit test, the on-off of the test circuit can be accurately controlled, and the time, intensity and other parameters of the short-circuit simulation can be adjusted according to different test requirements. This precise control method allows the short-circuit test to be carried out in a strictly controlled environment, avoiding damage to the battery or test equipment due to long short-circuit time or excessive short-circuit current, greatly improving the safety of the test. At the same time, the system can collect test data in real time and use it for quality analysis to ensure the integrity and traceability of the test data, overcoming the defects of traditional manual records that are cumbersome and easy to miss, thereby greatly improving the factory inspection quality of the battery short-circuit protection module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of a battery short circuit test fixture detection circuit in one embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of a partial circuit structure of a detection circuit and a control module in a battery short-circuit test fixture detection circuit in one embodiment of the present application; Figure 3 It is a schematic diagram of a partial circuit structure of a test switch module in a battery short circuit test fixture detection circuit in one embodiment of the present application; Figure 4 It is a schematic diagram of a partial circuit structure of a switch driving module in a battery short circuit test fixture detection circuit in one embodiment of the present application; Figure 5It is a schematic diagram of a partial circuit structure of a switch management module in a battery short circuit test fixture detection circuit in one embodiment of the present application; Figure 6 It is a schematic diagram of a partial circuit structure of a capacitor protection module in a battery short circuit test tool detection circuit in one embodiment of the present application; Figure 7 It is a schematic diagram of a partial circuit structure of a light indication module in a battery short circuit test tool detection circuit in one embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings.

[0028] In one embodiment, if Figure 1 As shown, the present application discloses a battery short-circuit test fixture detection circuit, a battery short-circuit test fixture detection circuit includes a tested BMS board, an air switch and a short-circuit test fixture, the short-circuit test fixture includes a test switch module, a control module, a switch drive module and a switch management module, the tested BMS board, the air switch and the switch management module are connected in series to form a detection loop, the signal output end of the test switch module is connected to the signal input end of the control module, the signal output end of the control module is connected to the signal input end of the switch drive module, and the signal output end of the switch drive module is connected to the signal input end of the switch management module; The test switch module allows the tester to manually press the corresponding test switch to generate a corresponding switch signal. After receiving the switch signal, the control module drives the switch management module to turn on or off through the switch drive module, thereby simulating the corresponding test state.

[0029] In this embodiment, the core logic of the circuit is to realize the automation and precise control of the battery short-circuit test through the series connection and signal control of multiple modules. The tested BMS board, the air switch and the switch management module are connected in series to form a complete short-circuit detection circuit, so that the short-circuit test tooling can verify the short-circuit protection function of the BMS board. The composition of the detection circuit ensures that when the switch management module is turned on, the current can flow in the test circuit, thereby simulating the short-circuit state; when the switch management module is disconnected, the circuit is cut off and the short-circuit test is terminated, ensuring that the battery system will not be damaged by continuous short circuit during the test.

[0030] The signal output end of the test switch module is connected to the signal input end of the control module. Its function is that the tester manually presses the test switch to generate the corresponding switch signal and transmit it to the control module. The function of the test switch module is to provide a trigger signal for the short-circuit test so that the control module can perform the corresponding short-circuit test operation according to different input signals. Since the short-circuit test needs to be performed under specific conditions, the tester ensures that the test is performed in a safe and controllable manner by manually triggering it, rather than performing the short-circuit test in an unordered or random manner.

[0031] The signal output end of the control module is connected to the signal input end of the switch drive module, which is responsible for receiving the input signal from the test switch module and converting it into a control signal to control the downstream switch drive module. The function of the control module is to determine the current test requirements and decide whether to trigger the short circuit test or terminate the short circuit test according to different input signals. It can determine whether the current input switch signal belongs to on-control or off-control through the logic circuit or the programming logic of the MCU, and generate the corresponding output signal so that the entire test process runs according to the set logic.

[0032] The signal output end of the switch driving module is connected to the signal input end of the switch management module. Its function is to drive the execution unit of the switch management module according to the instructions of the control module. As an intermediate bridge, the switch driving module ensures that the low-power signal of the control module can be effectively converted into an effective signal to drive the switch management module, so that the actuators such as MOS tubes or relays can work correctly. Since the control module usually uses a logic level signal, and the switch management module usually requires a higher power drive signal, the switch driving module can amplify the signal to meet the working requirements of the switch management module, ensuring that the short-circuit test is carried out in a stable and controllable condition.

[0033] As the executive mechanism of the entire short-circuit test, the switch management module directly determines whether the short-circuit loop is turned on or off. The signal input end of the switch management module is connected to the signal output end of the switch drive module, which means that when the switch drive module receives the control signal of the control module, it will trigger the switch management module to turn on when a short-circuit test is required, and turn off when the test is over or the protection mechanism is triggered. The switch management module is usually composed of multiple MOS tubes or relays, which can quickly perform switching operations according to the instructions of the control signal. The conduction of the MOS tube means that the short-circuit test loop is closed and the battery pack enters the short-circuit test state; the shutdown of the MOS tube means that the short-circuit test loop is disconnected and the test is over.

[0034] The entire control logic ensures the efficient execution of the short-circuit test while ensuring the safety of the system and the test accuracy. During the test, the test switch module acts as a manual trigger unit to provide a clear on or off signal, the control module performs logical processing on the signal, and the switch drive module amplifies the signal and transmits it to the switch management module, so that the short-circuit test can proceed smoothly according to the predetermined logic. Through this structural design, the cumbersome process of relying on manual construction of short-circuit loops in traditional testing methods can be avoided, while reducing manual errors, improving test accuracy, and ensuring the safety and reliability of the battery short-circuit protection module.

[0035] In summary, the present application is operated through a test switch module, which provides a human-computer interaction interface, allowing the tester to press the test switch to trigger the test signal, thereby avoiding manual recording and test errors. Once the test signal is triggered, the control module will receive the signal and send instructions to the switch drive module to drive the MOS tube and other switch elements to turn on or off, forming an automated short-circuit test process. This circuit structure not only greatly improves the test efficiency, but also reduces the inconsistency that may be caused by manual operation, and improves the repeatability and reliability of detection; and through the synergy of the control module and the switch management module, it is ensured that during the short-circuit test process, the on-off of the test loop can be accurately controlled, and the time, intensity and other parameters of the short-circuit simulation can be adjusted according to different test requirements. This precise control method allows the short-circuit test to be carried out in a strictly controlled environment, avoiding damage to the battery or test equipment due to too long a short-circuit time or too large a short-circuit current, greatly improving the safety of the test. At the same time, the system can collect test data in real time and use it for quality analysis to ensure the integrity and traceability of the test data, overcoming the defects of traditional manual record-keeping that is cumbersome and prone to omissions, thereby greatly improving the factory inspection quality of the battery short-circuit protection module.

[0036] Further, such as Figure 2 As shown, the control module includes a front-end control chip AFE and an MCU chip, the signal input end of the MCU chip is connected to the signal output end of the test switch module, the data communication end of the MCU chip is connected to the data communication end of the front-end control chip AFE, and the signal output end of the front-end control chip AFE is connected to the signal input end of the switch drive module.

[0037] In this embodiment, the control module is composed of a front-end control chip AFE and an MCU chip, which work together to ensure high-precision signal processing and short-circuit protection control of the short-circuit test system. The signal input end of the MCU chip is connected to the signal output end of the test switch module, which means that when the tester presses the test switch module, the module will provide a corresponding control signal to the MCU chip, indicating that the system needs to perform short-circuit testing, terminate testing, or reset operations. After the MCU chip receives the signal, as the core control unit of the entire system, it will parse the operation instruction according to the type of input signal, and perform corresponding logical judgment through its internal logic processing unit to determine whether to trigger the short-circuit test or terminate the test process that has been carried out.

[0038] The data communication end of the MCU chip is connected to the data communication end of the front-end control chip AFE to form a two-way communication link, so that the MCU chip can obtain the monitoring data of the front-end control chip AFE in real time and send control instructions to the front-end control chip AFE at the same time. This connection method ensures that the front-end control chip AFE can continuously monitor the key electrical parameters of the short-circuit test circuit, such as current, voltage, etc., and feed back the detected data to the MCU chip, so that the MCU chip can perform intelligent short-circuit test management based on these data. The core function of the front-end control chip AFE is to accurately measure the current change of the detection circuit and provide overcurrent protection during the short-circuit test. Since the short-circuit test will cause a large current to flow, if the current exceeds the set protection threshold, the front-end control chip AFE will feedback an over-limit signal to the MCU chip, so that the MCU chip can respond immediately, terminate the test and execute safety protection measures, thereby avoiding damage to the battery pack or test equipment due to overcurrent.

[0039] The signal output end of the front-end control chip AFE is connected to the signal input end of the switch drive module, so that the front-end control chip AFE can directly affect the working state of the switch drive module. When the front-end control chip AFE detects the current signal of the test loop, it can decide whether to send a trigger signal to the switch drive module according to the preset short-circuit protection threshold. When the front-end control chip AFE confirms that the short-circuit test should continue, it will send a keep-on signal to the switch drive module to keep the switch management module in a closed state to ensure that the test proceeds smoothly. When the front-end control chip AFE detects that the current exceeds the safe range, it will send a shutdown signal to the switch drive module to disconnect the MOS tube or relay of the switch management module, thereby cutting off the short-circuit test loop and protecting the battery pack and equipment from short-circuit shock damage.

[0040] The data communication connection between the MCU chip and the front-end control chip AFE enables the test system to have high-precision dynamic response capabilities. After receiving the detection data fed back by the front-end control chip AFE, the MCU chip can further analyze the changing trend of the current during the short-circuit test to optimize the test strategy, such as adjusting the short-circuit duration or recording the short-circuit current characteristic curve for subsequent product performance analysis. The direct connection between the front-end control chip AFE and the switch drive module enables the system to quickly shut down the test loop directly through the hardware protection mechanism of the front-end control chip AFE without relying on additional calculations of the MCU chip when a short-circuit anomaly occurs, thereby improving the real-time protection capability of the system. This multi-level control architecture enables the short-circuit test fixture to achieve highly automated and intelligent short-circuit test management, ensuring that the short-circuit detection process is both safe and efficient, while ensuring the accuracy of data collection to improve the traceability of test data and the reliability of product quality control.

[0041] Further, such as Figure 3 As shown, the signal input end of the MCU chip includes a conduction control signal input port and a disconnection control signal input port, the test switch module includes a conduction control unit and a disconnection control unit, the conduction control unit includes a switch SW2 and a resistor R1, the first end of the resistor R1 is connected to the conduction control signal input port, the second end of the resistor R1 is connected to the first end of the switch SW2, and the second end of the switch SW2 is grounded, the disconnection control unit includes a switch SW3 and a resistor R2, the first end of the resistor R2 is connected to the disconnection control signal input port, the second end of the resistor R1 is connected to the first end of the switch SW3, and the second end of the switch SW3 is grounded.

[0042] In this embodiment, the signal input end of the MCU chip is composed of a conduction control signal input port and a disconnection control signal input port, and these two ports receive different control signals from the test switch module respectively to achieve accurate control of the short-circuit test loop. The test switch module contains a conduction control unit and a disconnection control unit, which are used to provide a short-circuit test start signal and a termination signal respectively to ensure the controllability of the test process. The conduction control unit is composed of a switch SW2 and a resistor R1, and the first end of the resistor R1 is directly connected to the conduction control signal input port, so that the MCU chip can detect the voltage change on the port. The second end of the resistor R1 is connected to the first end of the switch SW2, and the second end of the switch SW2 is grounded. This connection method ensures that under normal circumstances, when the switch SW2 is not pressed, the conduction control signal input port is at a high level, and when the switch SW2 is pressed, the port is grounded through the resistor R1, so that the MCU chip detects a low-level signal, thereby triggering the conduction control logic, indicating that the system enters the short-circuit test state.

[0043] The disconnection control unit is composed of a switch SW3 and a resistor R2. Its function is opposite to that of the conduction control unit and is mainly used to terminate the short-circuit test. The first end of the resistor R2 is connected to the disconnection control signal input port of the MCU chip, and the second end of R1 is simultaneously connected to the first end of SW3, which means that the disconnection control unit and the conduction control unit share the second end of the resistor R1 to form a common node. The second end of the switch SW3 is grounded, so that when the switch SW3 is not pressed, the disconnection control signal input port of the MCU chip maintains a high level, and when the switch SW3 is pressed, the port is grounded through the resistor R2, so that the MCU chip detects a low-level signal, thereby triggering the disconnection control logic, instructing the system to terminate the short-circuit test and turn off the relevant switch management module.

[0044] This circuit design logic ensures that the MCU chip can accurately distinguish between the control signals of conduction and disconnection, avoiding false triggering caused by signal mixing or interference. The independence of the conduction control signal input port and the disconnection control signal input port enables the MCU chip to adjust the test state in time according to different control signals during the short-circuit test, achieving fast response and precise control. When the tester presses switch SW2, the MCU chip detects the level change of the conduction signal input port, triggers the short-circuit test logic, turns on the switch management module, closes the short-circuit loop, and the test begins. When the test needs to be terminated, press switch SW3, the MCU chip detects the low level of the disconnection signal input port, and immediately executes the termination logic, turning off the switch management module, cutting off the short-circuit loop, and the test ends.

[0045] The test process is completely automatically controlled by the MCU chip, and the reliability and operability of the short-circuit test are guaranteed through simple switch button operation. The addition of resistors R1 and R2 plays a role in current limiting and signal stabilization, preventing signal mutations from interfering with the input port of the MCU chip. At the same time, it also ensures the accurate signal collection of the MCU chip, ensuring that the short-circuit test tooling can work according to the predetermined logic, and improving the safety and accuracy of the system.

[0046] Further, such as Figure 3 As shown, the test switch module includes a reset control unit, which includes a switch SW4, a resistor R3 and a resistor R4, wherein the first end of the resistor R3 is connected to the power supply, the second end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is grounded, a common node between the second end of the resistor R3 and the first end of the resistor R4 is connected to the first end of the switch SW4, and the second end of the SW4 is connected to the reset control signal input end of the MCU chip.

[0047] In this embodiment, the reset control unit in the test switch module is composed of a switch SW4, a resistor R3 and a resistor R4, and its function is to provide a clear reset signal to the MCU chip so that the system can be reinitialized when necessary to prevent the system from failing to operate normally due to misoperation or abnormal conditions. The first end of the resistor R3 is directly connected to the power supply to ensure that it is always in a high potential state, and the second end of the resistor R3 is connected to the first end of the resistor R4 to form a voltage divider network so that the common node is in a stable voltage state. The second end of the resistor R4 is grounded so that when the circuit is in the default state, that is, when the switch SW4 is not pressed, the common node voltage is determined by the resistance ratio of the resistor R3 and the resistor R4, and is maintained within the effective level range of the reset control signal input end of the MCU chip to ensure that the MCU chip can operate stably and will not accidentally trigger the reset due to power supply fluctuations or other factors.

[0048] The common node between the second end of resistor R3 and the first end of resistor R4 is simultaneously connected to the first end of switch SW4, so that this point can both receive the power supply voltage and discharge it to the ground through resistor R4. By default, switch SW4 is not pressed. At this time, the reset control signal input end of the MCU chip receives the high-level signal provided by resistor R3 through the common node, ensuring the normal operation of the MCU chip. When the tester needs to reset the system, press switch SW4, and the first end of switch SW4 is directly connected to the second end to form a low-impedance path, so that the common node originally at a high level is forced to be pulled to the ground potential, causing the reset control signal input end of the MCU chip to change from a high level to a low level, thereby triggering the MCU chip to perform a reset operation and reinitialize the entire system.

[0049] The logic of this circuit structure ensures the reliability of the reset signal of the MCU chip, and also prevents the reset signal from being accidentally triggered when it is not necessary. The combination of resistors R3 and R4 forms a pull-up and pull-down voltage divider network, which keeps the reset input of the MCU chip at a stable high level when switch SW4 is not pressed, and when a reset is required, the switch SW4 is shorted to ground to achieve a low-level trigger reset. It can provide a stable reset control mechanism, so that the MCU chip can be quickly restored to the initial state through simple key operations when a software error, test abnormality, or the need to reload the test program occurs, avoiding the tedious process of powering off and restarting, and improving the operability and reliability of the system. The manual control method of switch SW4 also ensures that the tester can manually trigger the reset when necessary, preventing the system from entering an uncontrollable state, and enhancing the stability and maintainability of the short-circuit test fixture.

[0050] Further, such as Figure 2 As shown, a current sensing resistor is provided in the detection circuit, and the current sensing input terminal of the front-end control chip AFE is respectively connected to the two ends of the current sensing resistor.

[0051] In this embodiment, a current-sensing resistor is provided in the detection circuit, and its function is to provide an accurate current detection path, so that the front-end control chip AFE can monitor and feedback the current flowing through the detection circuit in real time during the short-circuit test. The current-sensing resistor is installed in series in the detection circuit, so that all currents passing through the short-circuit test circuit will pass through the resistor, and a voltage difference proportional to the current magnitude is formed at both ends of the resistor. The current detection input end of the front-end control chip AFE is respectively connected to the two ends of the current-sensing resistor. This connection method ensures that the AFE can directly measure the voltage drop on the current-sensing resistor, and use the internal high-precision amplifier circuit and ADC conversion module to convert the voltage value into the actual current value to provide accurate short-circuit current measurement results.

[0052] The current detection logic of the AFE chip relies on Ohm's law, that is, the current flowing through the current-sense resistor is equal to the ratio of the voltage drop across the resistor to the resistance value. Therefore, the AFE chip can calculate the actual current in the detection loop by measuring the voltage difference across the current-sense resistor. This measurement method avoids the complexity of directly measuring large currents, and can provide high-precision detection results, so that the short-circuit test tooling can accurately determine whether the current in the short-circuit test loop exceeds the safety threshold. During the short-circuit test, when the detection loop is turned on, the current begins to flow through the current-sense resistor, and the current detection input of the AFE chip obtains the voltage signal and calculates the current value in real time. If the current detected by the AFE chip exceeds the set short-circuit protection threshold, for example, more than 100A, the AFE will immediately send an overcurrent alarm signal to the MCU chip, or directly trigger the switch drive module to quickly shut down the MOS tube of the switch management module, thereby cutting off the short-circuit test loop and preventing the test equipment or battery pack from being damaged by overcurrent.

[0053] This detection method can provide continuous current monitoring throughout the short-circuit test, allowing the system to not only detect the initial current at the beginning of the short-circuit test, but also continuously monitor current changes during the test, thereby analyzing the short-circuit protection performance and response time of the BMS board. In addition, the high-precision detection capability of the AFE chip enables the system to distinguish between normal short-circuit test current and abnormal overcurrent conditions, making short-circuit testing more intelligent and safe. By adding a current-sensing resistor to the detection loop and utilizing the current detection function of the AFE chip, the short-circuit test fixture can ensure the accuracy of the test data and provide overcurrent protection, improving the reliability and safety of the entire short-circuit test system.

[0054] Further, such as Figure 4As shown, the switch driving module includes a resistor R5, a resistor R6 and a driving chip U5, the signal output end of the front-end control chip AFE is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the signal input end of the driving chip U5, the signal output end of the driving chip U5 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the signal input end of the switch management module.

[0055] In this embodiment, the switch driving module is composed of a resistor R5, a resistor R6 and a driver chip U5, and its function is to receive the control signal from the front-end control chip AFE, and process and amplify the signal so that it can effectively drive the MOS tube or relay of the switch management module, thereby controlling the conduction or disconnection of the short-circuit test loop. The signal output end of the front-end control chip AFE is connected to the first end of the resistor R5, so that the front-end control chip AFE can apply a voltage signal to the resistor R5 through the signal output end when it detects that the short-circuit test current reaches the set condition. The function of the resistor R5 is to limit the current of the output signal of the front-end control chip AFE to prevent the signal output end of the AFE chip from being directly connected to the signal input end of the driver chip U5 due to excessive current. At the same time, the resistor R5 can also play the role of impedance matching, making the signal transmission more stable and reliable.

[0056] The second end of the resistor R5 is connected to the signal input end of the driver chip U5, which means that the signal output by the AFE enters the driver chip U5 for further processing after attenuation and current limiting by the resistor R5. The function of the driver chip U5 is to condition, amplify and isolate the low-power signal transmitted by the front-end control chip AFE, so that it can effectively drive high-power MOS tubes or other switching elements. Since the signal output capability of the front-end control chip AFE is weak, directly driving the MOS tube may not provide enough current, so it is necessary to perform signal conversion through the driver chip U5 so that the switch management module can work stably. The driver chip U5 usually contains functions such as level conversion, power amplification and short-circuit protection to ensure that the control signal of the switch management module can respond quickly and avoid reverse impact of high voltage or high current on the front-end control chip AFE.

[0057] The signal output end of the driver chip U5 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the signal input end of the switch management module. This connection method ensures that the drive signal can be properly current limited before being transmitted to the switch management module to prevent the drive signal from being too large, causing the MOS tube to break down or damaging other key components of the switch management module. The role of resistor R6 is to further stabilize the signal so that the signal output by the driver chip U5 can enter the switch management module with appropriate amplitude and strength, ensuring that the switch management module can accurately perform the switch operation. When the output signal of the driver chip U5 is at a high level, the MOS tube of the switch management module will be triggered to turn on, closing the short-circuit test loop, and the test enters the execution stage; when the output signal of the driver chip U5 is at a low level, the MOS tube will be turned off, the short-circuit test loop will be cut off, and the test will terminate.

[0058] This circuit design logic ensures that when the short-circuit test fixture performs a short-circuit test, the AFE can trigger the drive signal by detecting the short-circuit current, and amplify the signal through the driver chip U5, so that the switch management module can accurately execute the switch command. At the same time, resistors R5 and R6 provide current limiting and impedance matching functions during signal transmission to ensure the stability of signal transmission and prevent excessive current from damaging the front-end control chip AFE and the switch management module. The entire system uses high-precision detection of the front-end control chip AFE, signal amplification and conditioning of the driver chip U5, and precise execution of the switch management module, so that the short-circuit test can be carried out in a safe and controllable state, improving the reliability and accuracy of the test and ensuring the safety of the test equipment and the battery pack under test.

[0059] Further, such as Figure 5 As shown, the switch management module includes a resistor R21, a voltage regulator tube ZD3 and multiple MOS switch conduction units, each MOS switch conduction unit includes at least a first current limiting resistor and a MOS tube, and the two conduction ends of the MOS tube are used to connect to the detection loop, the controlled end of the MOS tube is connected to the first end of the first current limiting resistor, the second end of the first current limiting resistor is connected to the signal output end of the switch driving module, the first end of the resistor R21 is connected to the signal output end of the switch driving module, the second end of the resistor R21 is grounded, the negative end of the voltage regulator tube ZD3 is connected to the signal output end of the switch driving module, and the positive end of the resistor R21 is grounded.

[0060] In this embodiment, the switch management module is composed of a resistor R21, a voltage regulator ZD3 and a plurality of MOS switch conduction units, and its function is to realize precise switch control of the short-circuit test loop according to the control signal of the switch drive module, so that the short-circuit test process is both stable and safe. The MOS switch conduction unit is a core execution unit, and each MOS switch conduction unit includes at least a first current limiting resistor and a MOS tube, wherein the two conduction ends of the MOS tube are directly connected to the detection loop, so that when the MOS tube is turned on, the detection loop is closed, and the current can flow freely, thereby completing the short-circuit test, and when the MOS tube is turned off, the detection loop is cut off and the test is terminated, thereby realizing the control of the short-circuit test.

[0061] The controlled end of the MOS tube, that is, the gate, is connected to the first end of the first current limiting resistor, so that when the first current limiting resistor receives the control signal of the switch driving module, the signal will enter the gate of the MOS tube through the first current limiting resistor to determine whether the MOS tube is turned on or off. The second end of the first current limiting resistor is connected to the signal output end of the switch driving module, so that the output signal of the switch driving module can directly affect the working state of the MOS tube, and the signal is appropriately attenuated by the current limiting resistor to prevent the gate current of the MOS tube from being too large, damaging the MOS tube or affecting its normal operation. Since the MOS tube requires a specific gate driving voltage to be reliably turned on, the role of the first current limiting resistor is not only to limit the current, but also to help the stable transmission of the signal to avoid the MOS tube from being turned on or off by mistake due to signal jitter.

[0062] The first end of the resistor R21 is also connected to the signal output end of the switch driving module, and the second end thereof is directly grounded. This connection method ensures that the signal output end of the switch driving module always has a stable current loop, so that the driving signal can effectively act on the controlled end of the MOS tube without causing signal attenuation due to high impedance. The existence of the resistor R21 helps to suppress signal spikes, making the driving signal more stable, and can provide a certain discharge path during the switching process of the MOS tube to prevent signal rebound from affecting the stability of the switching state.

[0063] The negative terminal of the voltage regulator ZD3 is connected to the signal output terminal of the switch drive module, and the positive terminal of the resistor R21 is grounded. This connection structure enables the voltage regulator ZD3 to play a voltage stabilization protection role when the signal voltage exceeds the set value, ensuring that the gate voltage of the MOS tube will not be too high to avoid damage to the MOS tube. The function of the voltage regulator ZD3 is to limit the maximum driving voltage of the MOS tube gate so that it always remains within the safe working range, thereby preventing the driving signal from overshooting or abnormally rising to affect the reliability of the MOS tube. At the same time, it can also enhance the anti-interference ability of the switch drive module and make the short-circuit test process more stable.

[0064] The logic of the entire switch management module is to control the switch state of the MOS tube through the signal output of the switch drive module, and ensure the stability and reliability of the drive signal through current limiting and voltage stabilization measures. When the switch drive module outputs a high-level signal, the first current limiting resistor provides a drive current to the gate of the MOS tube, so that the MOS tube is turned on, the short-circuit test loop is closed, and the battery pack enters the short-circuit test state; when the switch drive module outputs a low-level signal, the gate potential of the MOS tube is reduced, the MOS tube is turned off, the short-circuit test loop is cut off, and the test is terminated. Resistor R21 provides a stable signal discharge path to avoid false operation caused by signal suspension, and the voltage regulator ZD3 ensures that the gate voltage does not exceed the safety range of the MOS tube, preventing the MOS tube from being damaged due to overvoltage. This switch management mechanism enables the short-circuit test fixture to accurately control the execution time and protection mechanism of the short-circuit test, which can not only ensure the reliability of the test, but also improve the safety and stability of the test system.

[0065] Further, such as Figure 2 and Figure 7 As shown, a battery short circuit test fixture detection circuit also includes a light indication module and a digital tube timing module, the light indication module includes multiple indication units, the indication unit includes at least a second current limiting resistor and a first light emitting diode, the first end of the second current limiting resistor is connected to the light indication signal output end of the MCU chip, the second end of the second current limiting resistor is connected to the positive end of the first light emitting diode, the negative end of the first light emitting diode is grounded, and the signal input end of the digital tube timing module is connected to the timing signal output end of the MCU chip.

[0066] In this embodiment, the addition of the light indication module and the digital tube timing module enables the battery short-circuit test fixture detection circuit to have real-time visual status feedback and intuitive time control functions, thereby improving the convenience and safety of the test operation. The light indication module provides different working status indications through multiple indication units, and each indication unit includes at least a second current limiting resistor and a first light-emitting diode. When the light indication signal output terminal of the MCU chip provides a signal, the second current limiting resistor limits the current and drives the first light-emitting diode to light up, indicating the short-circuit test status, short-circuit protection status or overcurrent protection status of the current system, so that the tester can intuitively judge the test process and system operation status, and avoid misjudgment or unnecessary short-circuit shocks caused by blind operation. The negative terminal of the first light-emitting diode is grounded to ensure the integrity of the current loop, so that the indicator light can work stably without affecting its display effect due to voltage fluctuations or current instability. The signal input of the digital tube timing module is connected to the timing signal output of the MCU chip, so that the MCU can accurately control the duration of the short-circuit test and display the countdown information through the digital tube to remind the tester of the remaining time or waiting time of the current test, thereby improving the predictability of the test process and ensuring that the tester can prepare in advance to avoid misoperation or safety hazards caused by time uncertainty. This integrated indication and timing function makes the short-circuit test more intelligent and efficient, reduces human intervention, improves test consistency, and enhances the safety and controllability of the short-circuit test.

[0067] Further, such as Figure 6 As shown, a battery short circuit test fixture detection circuit also includes a capacitor protection module, which is connected between the air switch and the switch management module. The capacitor protection module includes two capacitor modules arranged in parallel, and the capacitor module includes multiple polar capacitors arranged in parallel with each other.

[0068] In this embodiment, the setting of the capacitor protection module enables the battery short-circuit test fixture detection circuit to have efficient short-circuit impact buffering capacity and system stability enhancement function, thereby improving the safety of the short-circuit test process and the reliability of the equipment. The module is connected between the air switch and the switch management module to form a buffer circuit that can absorb transient current impact when the short-circuit test is triggered. The two capacitor modules arranged in parallel ensure a larger total capacitance, so that the system can effectively absorb and disperse the large current at the moment of starting the short-circuit test, and prevent the sudden current from damaging the test equipment, battery pack and BMS board. Each capacitor module contains multiple polar capacitors arranged in parallel. This parallel structure not only increases the total capacity, but also reduces the equivalent series resistance (ESR), improves the current bearing capacity of the system, and enables the short-circuit test loop to quickly stabilize when the MOS tube is turned on, without causing severe voltage fluctuations or MOS tube overload damage due to transient large current impacts. In addition, the capacitor protection module can provide a partial energy recovery function after the short-circuit test is completed, so that the current in the circuit gradually decays instead of being disconnected instantly, reducing the EMI electromagnetic interference caused by current mutations, and improving the anti-interference ability of the entire short-circuit test system. This capacitor buffer design not only improves the safety and stability of the short-circuit test process, but also extends the service life of the test equipment, reduces the risk of hardware damage caused by short-circuit current overshoot, and makes short-circuit testing more controllable, accurate and efficient.

[0069] Furthermore, the capacitor protection module also includes a capacitor power indication unit, which is arranged in parallel with each capacitor module, and the capacitor power indication unit includes at least a second light-emitting diode and a third current-limiting resistor, the positive terminal of the second light-emitting diode is connected to the positive terminal of the detection circuit, the negative terminal of the second light-emitting diode is connected to the first end of the third current-limiting resistor, and the second end of the third current-limiting resistor is connected to the negative terminal of the detection circuit.

[0070] In this embodiment, a capacitor power indication unit is added to the capacitor protection module, so that the battery short-circuit test fixture detection circuit has real-time capacitor state monitoring and residual charge prompting functions, which improves the safety and operability of the test process. The capacitor power indication unit is connected in parallel with each capacitor module, so that it can synchronously monitor the charging state of the capacitor module when the short-circuit test fixture is running. The positive terminal of the second light-emitting diode is connected to the positive terminal of the detection circuit, and the negative terminal is connected to the negative terminal of the detection circuit through the third current limiting resistor, so that when there is still charge inside the capacitor module, the circuit forms a current path, and the second light-emitting diode is lit, prompting the tester that the capacitor has not been fully discharged, avoiding accidental touch or operation in a charged state, and preventing electric shock or equipment damage caused by residual charge. The addition of the third current limiting resistor ensures the stability of the indication current, prevents the light-emitting diode from being damaged due to overcurrent, and makes the brightness of the indicator light proportional to the residual voltage of the capacitor, so that the tester can intuitively judge whether the capacitor is in a safe state according to the on and off situation of the indicator light. This design not only provides a visual safety warning function and reduces the risk of misoperation, but also improves the user experience of the short-circuit test tooling, makes the test process more intelligent and safer, and enhances the short-circuit test tooling's ability to manage high-voltage stored charges.

[0071] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery short circuit test fixture detection circuit, characterized in that: The battery short-circuit test fixture detection circuit comprises a tested BMS board, an air switch and a short-circuit test fixture, wherein the short-circuit test fixture comprises a test switch module, a control module, a switch drive module and a switch management module, wherein the tested BMS board, the air switch and the switch management module are connected in series to form a detection loop, wherein the signal output end of the test switch module is connected to the signal input end of the control module, the signal output end of the control module is connected to the signal input end of the switch drive module, and the signal output end of the switch drive module is connected to the signal input end of the switch management module; The test switch module allows the tester to manually press the corresponding test switch to generate a corresponding switch signal. After receiving the switch signal, the control module drives the switch management module to be turned on or off through the switch driving module, thereby simulating the corresponding test state.

2. A battery short circuit test fixture detection circuit according to claim 1, characterized in that: The control module includes a front-end control chip AFE and an MCU chip, the signal input end of the MCU chip is connected to the signal output end of the test switch module, the data communication end of the MCU chip is connected to the data communication end of the front-end control chip AFE, and the signal output end of the front-end control chip AFE is connected to the signal input end of the switch driving module.

3. A battery short circuit test fixture detection circuit according to claim 2, characterized in that: The signal input end of the MCU chip includes a conduction control signal input port and a disconnection control signal input port, the test switch module includes a conduction control unit and a disconnection control unit, the conduction control unit includes a switch SW2 and a resistor R1, the first end of the resistor R1 is connected to the conduction control signal input port, the second end of the resistor R1 is connected to the first end of the switch SW2, and the second end of the switch SW2 is grounded, the disconnection control unit includes a switch SW3 and a resistor R2, the first end of the resistor R2 is connected to the disconnection control signal input port, the second end of the resistor R1 is connected to the first end of the switch SW3, and the second end of the switch SW3 is grounded.

4. A battery short circuit test fixture detection circuit according to claim 2, characterized in that: The test switch module includes a reset control unit, which includes a switch SW4, a resistor R3 and a resistor R4, wherein the first end of the resistor R3 is connected to a power supply, the second end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is grounded, a common node between the second end of the resistor R3 and the first end of the resistor R4 is connected to the first end of the switch SW4, and the second end of the SW4 is connected to the reset control signal input end of the MCU chip.

5. A battery short circuit test fixture detection circuit according to claim 2, characterized in that: The detection loop is provided with a current detection resistor, and the current detection input end of the front-end control chip AFE is respectively connected to the two ends of the current detection resistor.

6. A battery short circuit test fixture detection circuit according to claim 2, characterized in that: The switch driving module includes a resistor R5, a resistor R6 and a driving chip U5. The signal output end of the front-end control chip AFE is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the signal input end of the driving chip U5, the signal output end of the driving chip U5 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the signal input end of the switch management module.

7. A battery short circuit test fixture detection circuit according to claim 2, characterized in that: The switch management module includes a resistor R21, a voltage regulator tube ZD3 and multiple MOS switch conduction units, each of the MOS switch conduction units includes at least a first current limiting resistor and a MOS tube, and the two conduction ends of the MOS tube are used to be connected to the detection loop, the controlled end of the MOS tube is connected to the first end of the first current limiting resistor, the second end of the first current limiting resistor is connected to the signal output end of the switch driving module, the first end of the resistor R21 is connected to the signal output end of the switch driving module, the second end of the resistor R21 is grounded, the negative end of the voltage regulator tube ZD3 is connected to the signal output end of the switch driving module, and the positive end of the resistor R21 is grounded.

8. A battery short circuit test fixture detection circuit according to claim 2, characterized in that: The battery short circuit test fixture detection circuit also includes a light indication module and a digital tube timing module, the light indication module includes multiple indication units, the indication unit includes at least a second current limiting resistor and a first light emitting diode, the first end of the second current limiting resistor is connected to the light indication signal output end of the MCU chip, the second end of the second current limiting resistor is connected to the positive end of the first light emitting diode, the negative end of the first light emitting diode is grounded, and the signal input end of the digital tube timing module is connected to the timing signal output end of the MCU chip.

9. A battery short circuit test fixture detection circuit according to claim 1, characterized in that: The battery short circuit test fixture detection circuit also includes a capacitor protection module, which is connected between the air switch and the switch management module. The capacitor protection module includes two capacitor modules arranged in parallel, and the capacitor module includes a plurality of polar capacitors arranged in parallel with each other.

10. A battery short circuit test fixture detection circuit according to claim 9, characterized in that: The capacitor protection module also includes a capacitor power indication unit, which is arranged in parallel with each of the capacitor modules, and the capacitor power indication unit includes at least a second light-emitting diode and a third current-limiting resistor, the positive terminal of the second light-emitting diode is connected to the positive terminal of the detection circuit, the negative terminal of the second light-emitting diode is connected to the first end of the third current-limiting resistor, and the second end of the third current-limiting resistor is connected to the negative terminal of the detection circuit.

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