A test fixture
By designing a test fixture that includes a switching device and a drive test indicator, the problem of synchronous detection of signal response and feedback in traditional battery management system testing methods is solved, realizing efficient and simplified signal testing, which is suitable for rapid diagnosis of battery management systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EVE ENERGY CO LTD
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional battery management system testing methods cannot simultaneously detect the signal response and feedback of the control module, making it difficult to achieve linkage between digital input signals and drive signals. Furthermore, they require a variety of testing equipment, increasing equipment procurement costs and maintenance difficulties.
A test fixture was designed, comprising a switch, a drive test indicator, and a power supply, which can simultaneously test drive signals and digital input signals. The status change of the switch indicates whether the signal is normal, simplifying the operation process.
It improves testing efficiency, shortens product testing cycles, reduces operational difficulty, is suitable for non-professionals to perform simple tests, and reduces equipment costs.
Smart Images
Figure CN224501196U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present utility model relate to the field of testing technology, and particularly to a testing tooling. Background Art
[0002] In a battery management system, the performance test of control signals becomes an important link to ensure the normal operation of equipment and the qualified product quality. At present, there are many limitations in traditional testing methods. It is impossible to synchronously detect the response and feedback of the control module to signals, and it is difficult to realize the linkage between digital input signal testing and drive signal testing. When facing multiple products or different testing requirements, multiple testing devices need to be equipped, increasing the equipment procurement cost and maintenance difficulty. Content of the Utility Model
[0003] The present utility model provides a testing tooling to achieve the purpose of solving at least one defect existing in the prior art.
[0004] The embodiments of the present utility model provide a testing tooling, including: a first testing unit and a power supply;
[0005] The first testing unit includes a switching device and a drive test indicating device. The switching device is provided with a drive test port and a digital input test port;
[0006] The drive test port is connected to a drive signal port, and the digital input test port is connected to a digital input port;
[0007] The drive test port is used to receive the drive signal output by the drive signal port, and the switching device changes its switching state according to the drive signal;
[0008] The digital input test port is used to output a level signal to the digital input port, and the level of the level signal corresponds to the switching state of the switching device;
[0009] The drive test indicating device is connected to the switching device, and the drive test indicating device is used to indicate the switching state of the switching device;
[0010] The power supply is used to supply power to the first testing unit.
[0011] Optionally, the drive signal output by the drive signal port is a high-side drive signal.
[0012] Optionally, it further includes a second testing unit. The second testing unit includes a dry contact test indicating device, and the dry contact test indicating device is connected to a dry contact signal port;
[0013] The dry contact test indicating device is used to indicate whether the dry contact signal port outputs a dry contact signal;
[0014] The power supply is used to power the second test unit.
[0015] Optionally, the switching device includes a relay, the relay including a coil and contacts;
[0016] The coil is configured with the drive test port, and the contact is configured with the digital input test port.
[0017] Optionally, the contacts are normally closed contacts.
[0018] Optionally, the drive test indicator includes a voltmeter connected in parallel with the drive test port, and the voltmeter is used to measure the voltage across the coil.
[0019] Optionally, the drive test indicator includes an ammeter, which is connected in series with the drive test port and is used to measure the current passing through the coil.
[0020] Optionally, the dry contact test indicator includes a light-emitting diode.
[0021] Optionally, the drive signal port is a digital output port on the battery management system, and the digital input port is a digital input port set on the battery management system.
[0022] Optionally, the dry contact signal port is a digital output port of the battery management system.
[0023] Compared with existing technologies, the advantages of this invention are as follows: This invention proposes a testing fixture with functions for driving signal testing and digital input port testing. This fixture enables rapid and accurate testing of the device under test's ability to output driving signals normally, as well as the transmission and processing of digital input signals, significantly improving testing efficiency, shortening product testing cycles, and accelerating product development and production. Furthermore, the driving test indicator allows operators to intuitively observe the switching status of the switching device without the need for complex testing equipment or specialized knowledge, reducing the difficulty of testing operations and facilitating simple testing work for non-professionals. Attached Figure Description
[0024] Figure 1 This is a block diagram of the test fixture structure in the embodiment;
[0025] Figure 2 This is a schematic diagram of the test fixture structure in the embodiment. Detailed Implementation
[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0027] Figure 1 This is a block diagram of the test fixture structure in the embodiment, for reference. Figure 1 The test fixture includes a first test unit and a power supply.
[0028] The first test unit includes a switch device 101 and a drive test indicator device 102. The switch device 101 is provided with a drive test port (DO_1, GND) and a digital input test port (DI, DI_COM). The drive test port is connected to the drive signal port, and the digital input test port is connected to the digital input port.
[0029] The drive test port is used to receive the drive signal output from the drive signal port, and the switching device 101 changes the switching state according to the drive signal.
[0030] The digital input test port is used to output a level signal to the digital input port. The level of the signal corresponds to the switching state of the switching device 101.
[0031] The drive test indicator 102 is connected to the switch device 101, and the drive test indicator 102 is used to indicate the switching state of the switch device 101.
[0032] Power supply 200 is used to power the first test unit.
[0033] For example, in this solution, the switching device 101 in the first test unit is provided with a drive test port (DO_1, GND) and a digital input test port (DI, DI_COM). The drive test port is connected to the drive signal port of the device under test, and its function is to receive the drive signal output from the drive signal port. The switching device 101 will change its own switching state according to the received drive signal to realize the response and processing of the signal.
[0034] The digital input test port is connected to the digital input port of the device under test and is used to output a level signal to the digital input port. The level of this signal corresponds closely to the switching state of the switching device 101. Whether the digital input port of the device under test can receive the correct level signal determines whether the digital input port is normal.
[0035] The drive test indicator 102 is connected to the switch device 101. It can intuitively indicate the switching status of the switch device 101, making it convenient for operators to understand whether the drive signal port can output drive signals normally.
[0036] Power supply 200 provides a stable power supply to the first test unit, ensuring that the first test unit can operate normally.
[0037] For example, in this solution, the switching device 101 can be selected as a relay or an electronic switch chip, and the selected digital input / output interface on the switching device 101 can be used as the drive test port (DO_1, GND) and the digital input test port (DI, DI_COM).
[0038] For example, in this solution, the driving test indicator device 102 can be a light-emitting diode, an LCD screen, etc. When the switching device 101 is in different states, the state can be indicated by the light-emitting diode illuminating or turning off; or the display screen can be configured to communicate with the switching device 101 (electronic switch chip) and display the corresponding switching state.
[0039] For example, in this solution, the power supply 200 can be a DC regulated power supply. The output terminal of the power supply is connected to the power interface of the first test unit to supply power to the first test unit.
[0040] For example, in this solution, during testing, the drive test port of the test fixture is connected to the drive signal port, the digital input test port is connected to the digital input port, and the power supply 200 supplies power to the first test unit.
[0041] The drive signal port outputs a drive signal to the drive test port, and the switching device 101 receives the drive signal and changes its switching state. At this time, the drive test indicator device 102 displays the state change of the switching device 101 in real time.
[0042] The digital input test port outputs a corresponding level signal to the digital input device based on the switching state of the switch device 101. The operator can determine whether the digital input port is functioning correctly by referring to the feedback information from the digital input device and the display of the drive test indicator device 102.
[0043] This embodiment proposes a test fixture that integrates drive signal testing and digital input port testing functions. This fixture enables rapid and accurate testing of the device under test's (DUT) ability to output drive signals normally, as well as the transmission and processing of digital input signals. This significantly improves testing efficiency, shortens product testing cycles, and helps accelerate product development and production. Furthermore, the drive test indicator allows operators to visually observe the switching status of the device without requiring complex testing equipment or specialized knowledge, reducing the difficulty of testing operations and facilitating simple testing work for non-professionals.
[0044] Based on any of the aforementioned schemes, in one possible implementation, the drive signal output from the drive signal port is a high-side drive signal.
[0045] In this solution, the test fixture is used to test whether the high-side drive function can be performed normally when the high-side drive signal is output from the drive signal port. The high-side drive signal is a high-level (current) signal.
[0046] For example, in this solution, the switching device may include a MOSFET. The MOSFET's withstand voltage, on-resistance, and maximum current are selected according to actual test requirements. The source of the MOSFET may be grounded, the drain may be connected to the load resistor and the power supply, and the gate may be connected to the DO_1 of the drive test port to receive the high-side drive signal.
[0047] For example, in this solution, a high-side drive signal is applied to the gate of the MOSFET, turning the MOSFET on. At this time, the electronic switch chip outputs a corresponding high-level signal to the digital input test port according to the MOSFET's on-state. When the signal driving the test port is low, the MOSFET is turned off, and the electronic switch chip outputs a corresponding low-level signal to the digital input test port according to the MOSFET's on-state.
[0048] For example, in this solution, the method by which the electronic switch chip detects the switching state of the MOSFET is not limited. For instance, the electronic switch chip can determine the switching state of the MOSFET by voltage detection method, current detection method, etc.
[0049] Based on any of the aforementioned schemes, in one possible implementation scheme, the test fixture further includes a second test unit, which includes a dry contact test indicator device connected to a dry contact signal port.
[0050] The dry contact test indicator is used to indicate whether the dry contact signal port outputs a dry contact signal; the power supply is used to power the second test unit.
[0051] For example, in this solution, the dry contact test indicator and the power supply can be connected in series with the dry contact signal port. When the dry contact of the device under test is closed, the loop formed by the dry contact test indicator, the power supply and the dry contact signal port is closed, and the dry contact test indicator sends an indicator signal. When the node is open, the above loop is open and the dry contact test indicator does not work.
[0052] For example, in this solution, the dry contact test indicator can emit sound, light and other indicator signals. By directly utilizing the indicator signals of the dry contact test indicator, a simple and reliable test of the dry contact function can be achieved.
[0053] Based on any of the aforementioned solutions, in one possible implementation, the switching device includes a relay, which includes a coil and contacts; the coil is configured with a drive test port, and the contacts are configured with a digital input test port.
[0054] In this scheme, the coil is connected to the drive test port. When a drive signal is received, the coil is energized, and the contacts close or open. After the coil is de-energized, the contacts return to their initial state. When the contacts close or open, a high-level or low-level signal is output to the digital input test port.
[0055] In this scheme, the drive test ports (DO_1, GND) are connected to the relay coil, and the drive signal output from the drive test ports provides drive current to the coil. The digital input test ports (DI, DI_COM) are connected to the relay contacts and receive the on / off status signals of the contacts.
[0056] For example, in this solution, the drive signal is input through DO_1, then the coil is energized to generate a magnetic field, the contacts are activated when the coil is energized, and the corresponding level signal is output from the DI port.
[0057] For example, in this solution, the positive terminal of the power supply can be connected to the digital input test port DI through the normally open contact of the relay, and the negative terminal of the power supply can be connected to the digital input test port DI_COM. When the coil is energized, the normally open contact closes, and the digital input test port DI receives a high-level signal through the pull-up resistor. When the coil is de-energized, the digital input test port DI is at a low level.
[0058] For example, in this solution, the drive test indicator can be connected in parallel with the coil or contacts. The drive test indicator is configured to work when the coil is energized, generating an indicator signal to indicate that the relay is in a conducting state. When the coil is de-energized, the drive test indicator does not work.
[0059] In this design, a relay is used as the switching device. The coil is connected to the drive test port, and the contacts are used to connect to the digital input test port. There is no direct electrical connection between the coil and the contacts, thus avoiding interference between tests. The relay eliminates the need for complex drive circuits, reducing design costs.
[0060] Based on the aforementioned solution of using relays in the switching device, in one possible implementation, the contacts are normally closed contacts.
[0061] In this scheme, the common contact of the relay can be grounded, the normally closed contact of the relay is connected to the digital input test port DI, and the positive terminal of the power supply is connected to the digital input test port DI of the relay through a pull-up resistor.
[0062] In this scheme, when the coil is not energized, the normally closed contact is closed and the digital input test port DI outputs a low level; when the coil is energized, the normally closed contact is open and the digital input test port DI outputs a high level.
[0063] Based on any of the aforementioned schemes, in one possible implementation, the drive test indicator includes a voltmeter connected in parallel with the drive test port, and the voltmeter is used to measure the voltage across the coil.
[0064] In this scheme, the drive test indicator device uses a voltmeter, which is connected in parallel with the drive test port to directly measure the voltage across the relay coil, thereby determining the working status of the relay.
[0065] When the drive test port outputs a drive signal, current flows through the relay coil, generating a voltage difference across the coil. At this time, the voltmeter displays the voltage value. If the relay is not working properly, the voltage across the coil will be abnormal. By observing the changes in the voltmeter reading, the operating status of the relay can be monitored intuitively and accurately.
[0066] For example, in this solution, a voltmeter with an appropriate range is selected based on the rated voltage of the relay coil. For instance, if the rated voltage of the relay coil is 12V, a DC voltmeter with a range of 0-15V or 0-20V can be selected.
[0067] Connect the positive terminal of the voltmeter to the DO_1 terminal of the drive test port, and connect the negative terminal to the GND terminal of the drive test port to achieve parallel connection of the voltmeter and the relay coil.
[0068] In this solution, the voltmeter provides precise voltage values, which, compared to indicator lights that only indicate on / off states, more accurately reflects the operating status of the relay coil. When unstable drive signals cause coil voltage fluctuations, the voltmeter can promptly detect these changes, improving the accuracy and efficiency of fault diagnosis.
[0069] Based on any of the aforementioned solutions, in one possible implementation, the drive test indicator includes an ammeter connected in series with the drive test port, and the ammeter is used to measure the current passing through the coil.
[0070] In this solution, the current flowing through the relay coil is directly measured by connecting the ammeter in series with the relay coil, thereby determining the relay's operating status.
[0071] For example, in this solution, the drive test port DO_1 is connected to the relay coil, the relay coil is connected to the positive terminal of the ammeter, and the negative terminal of the ammeter is connected to the drive test port GND.
[0072] In this solution, by connecting the ammeter in series in the coil circuit, real-time and accurate monitoring of the relay's operating status can be achieved.
[0073] Based on any of the aforementioned solutions, in one possible implementation, the dry contact test indicator includes a light-emitting diode.
[0074] In this scheme, the light-emitting diode is used as a dry contact test indicator. The opening and closing of the dry contact affects the opening and closing of the circuit, thereby controlling the light-emitting diode's brightness. When the dry contact is closed, the circuit is closed, and the current flows through the light-emitting diode, causing it to light up. When the dry contact is open, the circuit is open, and the light-emitting diode is turned off.
[0075] In this solution, the LED directly displays the status of the dry contact by turning it on or off, without the need for additional testing equipment or complex operations. Operators can quickly determine whether the dry contact is working properly with the naked eye, which greatly improves testing efficiency and reduces the difficulty of operation. It is especially suitable for rapid on-site testing scenarios.
[0076] Based on any of the aforementioned solutions, in one possible implementation, the drive signal port is a digital output port on the battery management system, and the digital input port is a digital input port set on the battery management system.
[0077] In this solution, the digital output ports and digital input ports of the Battery Management System (BMS) serve as the interfaces for logic control and status monitoring. The digital input ports can output high / low level signals to drive external actuators, enabling functions such as battery charging / discharging control and safety protection. The digital input ports can also receive external switching signals to acquire information such as the battery system's connection status and fault signals.
[0078] For example, in this solution, the test fixture can work in conjunction with the BMS digital output port in the following way: the BMS digital output port outputs a high-side drive signal, which drives the relay of the test fixture to operate, and the operation of the relay is used to determine whether the high-side drive function of the BMS is normal.
[0079] The digital input test port of the test fixture outputs a level signal to the digital input port of the BMS. The BMS determines whether the digital input port is normal by detecting the level of the digital input port.
[0080] Based on any of the aforementioned schemes, in one possible implementation, the dry contact signal port is the digital output port of the battery management system.
[0081] In this solution, the digital output port of the BMS acts as a dry contact signal port. The BMS can output dry contact signals through the digital output port according to the battery status (such as voltage, temperature, state of charge, etc.) or external commands.
[0082] When the BMS determines that an operation needs to be performed (such as cutting off the charging circuit or activating the alarm device), the internal contacts of the digital output port close, which is equivalent to the dry contact closing, making the external circuit conductive; conversely, the contacts open, and the external circuit is disconnected.
[0083] Figure 2 This is a schematic diagram of the test fixture structure in the embodiment, for reference. Figure 2 Based on any of the aforementioned schemes, in one possible implementation scheme, the test fixture includes: a first test unit, a second test unit, and a power supply 200.
[0084] The first test unit includes a relay, a voltmeter 1013, and an ammeter 1014. The relay is configured as a relay coil 1011 and a relay normally closed contact 1012.
[0085] Voltmeter 1013 is connected in parallel with drive test port DO_1 and drive test port GND. Drive test port DO_1 is connected to relay coil 1011. Relay coil 1011 is connected to drive test port GND through ammeter 1014.
[0086] The positive terminal of power supply 200 is connected to the normally closed contact 1012 of the relay, the common terminal of the normally closed contact 1012 of the relay is connected to the digital input test port D1, and the digital input test port DI_COM is connected to the negative terminal of power supply 200.
[0087] The second test unit includes a light-emitting diode 1015, a dry contact signal port DO_2, a light-emitting diode 1015, a power supply 200, and a dry contact signal port DO_COM connected in series to form a circuit.
[0088] Power supply 200 also supplies power to voltmeter 1013 and ammeter 1014.
[0089] In this solution, the test fixture is used to test the high-side drive output, dry contact output, and digital signal input of the battery management system. The test fixture consists of a relay, a voltmeter 1013, an ammeter 1014, a light-emitting diode 1015, and a power supply 200.
[0090] In this scheme, one side (DO_1) of the relay coil 1011 is connected to the high-level output positive of the BMS, and the other side (GND) is connected to the output negative. The high side of the BMS controls the opening and closing of the relay coil. The ammeter 1014 is connected in series in the circuit of the relay coil 1011 to detect the current. The voltmeter 1013 is connected in parallel to the relay coil 1011 to collect the voltage magnitude.
[0091] Power supply 200 supplies power to voltmeter 1013 and ammeter 1014. The functionality of the BMS high-side drive can be determined by measuring the current and voltage of voltmeter 1013 and ammeter 1014.
[0092] One contact of the normally closed contact 1012 of the relay is connected to the positive terminal of the power supply 200, and the other contact (through the input test port DI) is connected to the digital signal input DI port of the BMS. The common COM port of the BMS digital signal is directly connected to the negative terminal of the power supply 200 through (input test port DI_COM).
[0093] When relay coil 1011 is not closed, normally closed contact 1012 is normally closed, and input test port DI outputs a high level. When the coil is closed, input test port DI outputs a low level. The BMS can detect whether the BMS digital signal function is intact by detecting the high or low level of the signal.
[0094] LED 1015 is connected to the positive terminal of the power supply on one side and to the dry contact output of the BMS (via the dry contact signal port DO_2) on the other side. The common terminal of the BMS dry contact (via the dry contact signal port D0_COM) is connected to the negative terminal of power supply 200. The opening and closing of the dry contact controls the indicator light's on and off status. The functionality of the dry contact is determined by observing the light's on and off status.
[0095] In this solution, the test fixture can solve the problem of BMS motherboards being unable to quickly diagnose the condition of interfaces under field conditions. This fixture is small and convenient, with a built-in power supply that can provide voltage for testing, and can diagnose three external signal interfaces at the same time. It has the advantages of multiple functions, speed and convenience.
[0096] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.
Claims
1. A testing fixture, characterized in that, include: First test unit and power supply; The first test unit includes a switching device and a drive test indicator device. The switching device is provided with a drive test port and a digital input test port. The drive test port is connected to the drive signal port, and the digital input test port is connected to the digital input port; The drive test port is used to receive the drive signal output by the drive signal port, and the switching device changes the switching state according to the drive signal; The digital input test port is used to output a level signal to the digital input port, and the high or low level of the level signal corresponds to the switching state of the switching device. The drive test indicator is connected to the switch device, and the drive test indicator is used to indicate the switching state of the switch device; The power supply is used to power the first test unit.
2. The test fixture as described in claim 1, characterized in that, It also includes a second test unit, which includes a dry contact test indicator device connected to a dry contact signal port; The dry contact test indicator is used to indicate whether the dry contact signal port outputs a dry contact signal; The power supply is used to power the second test unit.
3. The test fixture as described in claim 1, characterized in that, The switching device includes a relay, and the relay includes a coil and contacts; The coil is configured with the drive test port, and the contact is configured with the digital input test port.
4. The test fixture as described in claim 3, characterized in that, The contacts are normally closed.
5. The test fixture as described in claim 3, characterized in that, The drive test indicator includes a voltmeter connected in parallel with the drive test port, and the voltmeter is used to measure the voltage across the coil.
6. The test fixture as described in claim 3, characterized in that, The drive test indicator device includes an ammeter, which is connected in series with the drive test port and is used to measure the current passing through the coil.
7. The test fixture as described in claim 2, characterized in that, The dry contact test indicator includes a light-emitting diode.
8. The test fixture as described in any one of claims 1 to 7, characterized in that, The drive signal port is a digital output port on the battery management system, and the digital input port is a digital input port set on the battery management system.
9. The test fixture as described in any one of claims 1 to 7, characterized in that, The drive signal output from the drive signal port is a high-side drive signal.
10. The test fixture as described in claim 2, characterized in that, The dry contact signal port is the digital output port of the battery management system.