An integrated device for testing the reliability and stability of power batteries.

Abstract

This utility model relates to the field of battery testing technology, specifically an integrated device for testing the reliability and stability of power batteries. It employs a double-layer chamber structure, with a movable inner temperature-controlled test chamber housed within an outer explosion-proof environmental chamber. The inner chamber is precisely positioned via a three-way electrically controlled slide. The base at the bottom of the inner chamber is connected to a test frame via vibration motors, which are evenly distributed at the four corners of the test frame's bottom to achieve multi-directional excitation. The test frame is equipped with spring probe clamps that adaptively connect to the battery electrodes and maintain constant voltage conduction. An embedded fiber optic sensor monitors the battery surface temperature field in real time, and a gas collection tube at the top is directly connected to a mass spectrometer for rapid analysis of thermal runaway gases. A synchronously integrated positioning component holds and fixes the battery. A collaborative control system uses time-division multiplexing commands to control environmental parameters, mechanical vibration, and electrochemical testing. This device solves the problems of equipment dispersion and data asynchronization caused by traditional step-by-step testing, achieving multi-dimensional integrated testing and significantly improving testing efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, specifically an integrated device for testing the reliability and stability of power batteries. Background Technology

[0002] The reliability and stability testing of power batteries involves a series of rigorous testing and evaluation methods, including but not limited to cycle life testing, thermal stability analysis, overcharge and over-discharge protection verification, mechanical shock and vibration testing, environmental adaptability checks (such as high and low temperatures, humidity, etc.), electrochemical performance monitoring (such as internal resistance, capacity decay), safety performance evaluation (such as extreme condition tests such as short circuit, nail penetration, and extrusion), and functional verification of the BMS (Battery Management System). This ensures that the battery can maintain a high-efficiency, safe, and long-lasting operating state under various operating conditions, while meeting relevant industry standards and regulatory requirements, thereby providing a stable and reliable energy supply guarantee for applications such as electric vehicles and energy storage systems.

[0003] Traditional power battery testing requires separate steps on different equipment, such as an environmental chamber, a charge / discharge machine, and a vibration table, which leads to problems such as equipment dispersion, data asynchronization, and long testing cycles.

[0004] To address this, this technical solution designs an integrated device for testing the reliability and stability of power batteries. Utility Model Content

[0005] The purpose of this invention is to provide an integrated device for testing the reliability and stability of power batteries, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An integrated device for testing the reliability and stability of power batteries includes an outer explosion-proof environmental chamber and an inner temperature-controlled test chamber. The inner temperature-controlled test chamber is movable within the outer explosion-proof environmental chamber. The power battery to be tested is placed on the inner temperature-controlled test chamber for reliability and stability testing. A set of three-way electrically controlled slides, located inside the outer explosion-proof environmental chamber, is connected to the bottom of the inner temperature-controlled test chamber. The three-way (XYZ) movement of the three-way electrically controlled slides adjusts the position of the inner temperature-controlled test chamber within the outer explosion-proof environmental chamber. The power battery is automatically controlled to enter and exit through the outer chamber door. A base is installed at the bottom of the inner temperature-controlled test chamber, and a test frame is connected to the top of the base via evenly distributed vibration motors. Symmetrical positions are arranged on both sides of the top of the test frame. The test chamber is equipped with a positioning component for holding and positioning the power battery placed on the test frame. Simultaneously, multiple sets of vibration motors are used to test the vibration resistance of the power battery. The test frame is equipped with spring probe clamps that automatically connect to the power battery electrodes and apply constant pressure for electrical connection. Multiple sets of fiber optic sensors are embedded in the test frame to monitor the surface temperature field of the power battery in real time. A gas collection tube is installed at the top of the inner temperature-controlled test chamber, directly connected to a mass spectrometer for real-time monitoring of runaway gases. The outer explosion-proof environment chamber has a control system box with a built-in collaborative control system that connects to the electrical components inside the outer explosion-proof environment chamber, enabling externally controlled testing.

[0007] Compared with the prior art, the beneficial effects of this utility model are: by nesting the outer explosion-proof environment chamber and the inner temperature control test chamber, it integrates temperature control, vibration, electrochemical testing and gas monitoring functions, and reduces the equipment footprint; The inner compartment is precisely moved by a three-way electrically controlled slide, enabling the battery to automatically switch test items within a single device, thus shortening the test cycle. By using a collaborative control system to synchronize temperature control commands, vibration spectrum and charge / discharge curves via a time-division multiplexed bus, data timestamp errors are reduced. By directly connecting the explosion-proof metal layer to the mass spectrometer via the gas collection tube, millisecond-level early warning of thermal runaway can be achieved. Attached Figure Description

[0008] Figure 1 This is an external front view of an integrated device used to test the reliability and stability of power batteries.

[0009] Figure 2 This is an internal front view of an integrated device used to test the reliability and stability of power batteries.

[0010] Figure 3 This is a schematic diagram of the inner test chamber in an integrated device used to test the reliability and stability of power batteries.

[0011] Figure 4 for Figure 3 A magnified structural diagram of A in the middle.

[0012] The components include: an outer explosion-proof environmental chamber 10, an outer door 11, an explosion-proof metal layer 12, an inner temperature-controlled test chamber 14, an insulation layer 15, a three-way electrically controlled slide 16, a mounting plate 17, a base 18, a vibration motor 19, a test frame 20, a power battery 21, a spring probe clamp 22, a fiber optic sensor 23, a pressure plate 24, a lifting plate 25, an L-shaped bracket 26, an adjusting screw 27, a handle 28, a rotating connecting block 29, and a gas collection tube 30. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0014] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] Please see Figures 1-3An integrated device for testing the reliability and stability of power batteries includes an outer explosion-proof environmental chamber 10 and an inner temperature-controlled testing chamber 14. The inner temperature-controlled testing chamber 14 is movably disposed within the outer explosion-proof environmental chamber 10. The power battery 21 to be tested is placed on the inner temperature-controlled testing chamber 14 for reliability and stability testing. A set of three-way electrically controlled slides 16 disposed inside the outer explosion-proof environmental chamber 10 is connected to the bottom of the inner temperature-controlled testing chamber 14. The position of the inner temperature-controlled testing chamber 14 inside the outer explosion-proof environmental chamber 10 is adjusted by the three-way (XYZ) movement of the three-way electrically controlled slides 16. The power battery 21 is automatically controlled to enter and exit along the outer chamber door 11. A set of bases 18 is installed at the bottom of the inner temperature-controlled testing chamber 14. The top of the bases 18 is connected to a test frame 20 through evenly distributed vibration motors 19. The test frame 20 is symmetrically equipped with positioning components on both sides to hold and position the power battery 21 placed on the test frame 20. At the same time, the vibration of multiple sets of vibration motors 19 is used to test the vibration resistance of the power battery 21. The test frame 20 is equipped with spring probe clamps 22, which automatically connect to the electrodes of the power battery 21 and apply constant pressure to make electrical connections. Meanwhile, multiple sets of fiber optic sensors 23 are embedded in the test frame 20 to monitor the surface temperature field of the power battery 21 in real time. The inner temperature control test chamber 14 is equipped with a gas collection tube 30 at the top, which is directly connected to a mass spectrometer to monitor runaway gas in real time. The outer explosion-proof environment chamber 10 is equipped with a control system box, which has a built-in collaborative control system and is connected to the electrical components inside the outer explosion-proof environment chamber 10, thus realizing the detection mode controlled by the outside.

[0018] In this embodiment of the invention, both the outer explosion-proof environment chamber 10 and the inner temperature control test chamber 14 have a semi-circular structure in their vertical cross-sections. The outer explosion-proof environment chamber 10 has an outer door 11 on its front side wall for the entry and exit of the power battery 21 to be tested. At the same time, the outer explosion-proof environment chamber 10 has an explosion-proof metal layer 12 in its wall to achieve explosion-proof impact protection. Similarly, the material of the outer door 11 is the same as that of the explosion-proof metal layer 12, thus ensuring the overall explosion-proof performance of the outer explosion-proof environment chamber 10.

[0019] Specifically, the explosion-proof metal layer 12 is usually made of high-strength aluminum alloy, stainless steel, titanium alloy and nickel-based alloy, etc. The specific selection depends on the actual situation, and will not be elaborated here.

[0020] In one embodiment of the present invention, the collaborative control system includes a central controller, which synchronizes commands via a time-division multiplexing bus: temperature control commands for the inner temperature control test chamber 14, current curves of the charge / discharge machine, vibration frequency of the test frame 20, etc.

[0021] A mounting plate 17 is installed on the top of the three-way electronically controlled slide table 16. The top of the mounting plate 17 is fixedly connected to the bottom of the inner temperature control test chamber 14. At the same time, an inlet and outlet are also provided on the front side wall of the inner temperature control test chamber 14. The inlet and outlet are symmetrically hinged with inner doors. Meanwhile, an insulation layer 15 is provided in the wall of the inner temperature control test chamber 14 to maintain a constant temperature inside the inner temperature control test chamber 14, that is, to ensure the accuracy and efficiency of the test when the power battery 21 is tested.

[0022] Among them, the three-axis electrically controlled slide 16 uses a servo motor in conjunction with a ball screw. It sends pulse signals through the central controller to control the independent movement of the X / Y / Z axes. Each axis is equipped with a grating ruler to provide real-time position feedback, forming a closed-loop control and achieving a repeatability accuracy of ±0.1mm.

[0023] In a preferred embodiment of the present invention, the spring probe clamp 22 has a pre-compressed disc spring at the probe tail. When the power battery 21 electrode is pushed to contact the probe, the spring is compressed and adapts to the electrode height deviation. The multi-layer beryllium copper spring inside the probe is always in close contact with the electrode surface, and maintains low impedance conduction even under vibration environment. After the test is completed, the spring moves away and releases the thrust to automatically separate the probe from the electrode, avoiding scratches.

[0024] In a preferred embodiment of the present invention, the vibration motor 19 is centrally symmetrically installed at the four corners of the bottom of the test frame 20, and rotates in opposite directions in pairs. The sinusoidal excitation force output by the motor is transmitted to the entire test plane through the rigid base, synthesizing multi-directional random vibration.

[0025] As a preferred embodiment of the present invention, such as Figure 4 As shown, the positioning assembly includes L-shaped brackets 26 fixed on both sides of the top of the test frame 20. The straight section of the L-shaped brackets 26 is threaded with vertically distributed adjusting screws 27. The bottom of the adjusting screws 27 is rotatably connected to a lifting plate 25 through a rotating connecting block 29. A pressure plate 24 is installed at the bottom end of the lifting plate 25 facing the middle of the test frame 20. A handle 28 is connected to the top of the adjusting screws 27. Rotating the handle 28 controls the lifting of the adjusting screws 27. Thus, under the connection of the lifting plate 25, the adjusting pressure plate 24 applies longitudinal pressure to the power battery 21. With the cooperation of multiple sets of pressure plates 24, the power battery 21 is stably positioned on the test frame 20 for testing. A limiting rotation hole is provided inside the upper side of the lifting plate 25 corresponding to the rotating connecting block 29. The rotating connecting block 29 is placed in the limiting rotation hole and rotates while being longitudinally limited. The pressure plate 24 is designed to extend along the Y direction, so that it can apply sufficient pressure area to the top of the test frame 20, thus ensuring the stability of the pressure positioning.

[0026] As a preferred embodiment of the present invention, when the battery thermally runs away, the high-temperature gas is directly drawn into the gas collection tube 30 through the corrosion-resistant quartz tube. The inner wall of the tube is coated with polytetrafluoroethylene. The gas reaches the ionization chamber of the mass spectrometer within 3 seconds to avoid adsorption loss. The gas molecules are bombarded into ions by electrons in the ionization chamber and separated by magnetic field according to mass-charge ratio. The concentrations of characteristic gases such as H2 / CO / CH4 are output in real time. When the CO concentration is greater than 200 ppm and the H2 concentration is greater than 1%, it is determined to be a precursor to thermal runaway and an alarm is triggered.

[0027] The working principle of this utility model is as follows: In the idle position of this device, all the aforementioned driving components (representing power elements, electrical devices, and compatible power supplies) are connected via wires. The electrical connections are completed in sequence between the working components. The detailed connection methods are well-known in the field. The following mainly describes the working principle and process, without further explanation of the electrical control. Battery loading: Open the outer hatch 11 and drive the mounting plate 17 via the three-way electronically controlled slide 16 to move the inner temperature control test chamber 14 to the hatch opening; Place the power battery 21 on the test frame 20, rotate the handle 28 of the positioning component → adjust the screw 27 to drive the lifting plate 25 to move down → press the pressure plate 24 to press the two sides of the battery. Multi-dimensional testing launched: Environmental test: With the inner and outer cabin doors closed, the insulation layer 15 maintains the set temperature of the inner cabin at -40~85℃; Vibration test: Four corner vibration motors 19 rotate in opposite directions in pairs → synthesize multi-directional random vibration and transmit it to the test frame 20; Electrochemical test: The disc spring of the spring probe clamp 22 is compressed → the beryllium copper spring is pressed tightly against the battery electrode 21 → the charge and discharge current is applied; Safety monitoring: Fiber optic sensor 23 collects battery surface temperature in real time; thermal runaway gas is transported to mass spectrometer for analysis within 3 seconds through a polytetrafluoroethylene-coated gas collection tube 30. Abnormal response: When the gas collection tube 30 detects CO > 200 ppm and H2 > 1%, or when the fiber optic sensor 23 detects a local temperature difference > 8℃, the system will stop immediately. Test completed: The three-way electrically controlled slide 16 moves out of the inner chamber → the probe clamp 22 springs back and automatically disengages from the electrode → the positioning component releases its pressure.

[0028] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.

[0029] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An integrated device for detecting reliability and stability of a power battery, characterized in that, It includes an outer explosion-proof environment chamber (10) and an inner temperature control test chamber (14) nested inside it. The bottom of the inner temperature control test chamber (14) is connected to a three-way electrically controlled slide (16) via a mounting plate (17). The inner chamber is equipped with a base (18), a test frame (20) and a positioning component. The test frame (20) is mounted on the top of the base (18) via evenly distributed vibration motors (19). The test frame (20) is equipped with a spring probe clamp (22) and an embedded fiber optic sensor (23). A gas collection tube (30) is installed on the top of the inner chamber.

2. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, The outer explosion-proof environment chamber (10) has an explosion-proof metal layer (12) inside its walls and an outer door (11) on its front side.

3. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, The inner temperature control test chamber (14) has an insulation layer (15) inside its chamber wall.

4. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, The three-axis electrically controlled slide (16) is driven by a servo motor and the ball screw is equipped with a grating ruler for closed-loop control of each axis.

5. The integrated device for detecting the reliability and stability of power batteries according to claim 1, characterized in that, The number of vibration motors (19) is 4, which are centrally symmetrically distributed at the four corners of the bottom of the test frame (20). The two motors rotate in opposite directions to synthesize multi-directional vibration.

6. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, The probe tail of the spring probe holder (22) is preloaded with a disc spring, and multiple layers of beryllium copper spring sheets are provided inside to maintain low impedance conduction.

7. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, The positioning assembly includes L-shaped brackets (26) on both sides of the test frame (20), an adjusting screw (27) with vertical thread connection, a rotating connecting block (29) and a pressure plate (24).

8. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, The gas collection tube (30) is a quartz tube with polytetrafluoroethylene coated on the inner wall and is directly connected to the mass spectrometer.

9. The integrated device for detecting reliability and stability of power battery according to claim 1, wherein, It also includes a collaborative control system that synchronously controls the temperature of the inner temperature control test chamber (14), the frequency of the vibration motor (19), and the charging and discharging commands of the spring probe clamp (22) via a time-division multiplexing bus.

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