Battery performance test system based on deep-sea low-temperature ultrahigh-pressure environment

Abstract

The invention discloses a battery performance testing system based on a deep-sea low-temperature ultrahigh-pressure environment, and belongs to the field of battery performance testing, the battery performance testing system comprises a console and a testing cabin, and a watertight connector is arranged in the testing cabin; through cooperative use of the console, the test cabin, the watertight connector, the electrochemical tester, the distributed optical fiber sensor and the macroscopic monitoring module, the limitation of single function in the prior art is broken through, the watertight connector guarantees electrochemical parameter transmission, and the distributed optical fiber sensor is implanted into a battery cell to realize internal strain temperature monitoring. And the macroscopic monitoring module covers appearance and size monitoring through integrated design of a fixing ring, and data of electrochemical performance of the battery, microcosmic material state (such as internal strain and temperature of the battery cell) and macroscopic galvanic pile structure change (such as appearance bulge and size compression) can be synchronously acquired through cooperation of the three modules, so that multiscale data support from microcosmic to macroscopic is provided for research personnel.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery performance test, and particularly relates to a battery performance test system based on deep-sea low-temperature super-high pressure environment. BACKGROUND

[0002] Developing deep-sea operation equipment such as deep-sea vehicles, manned submersibles and deep-sea monitoring platforms is of great significance to the strategic goal of building a marine power for China. At present, almost all underwater operation equipment needs to carry battery components for power supply. However, the deep-sea working condition environment is extremely complex, with high static pressure, low temperature, high salt and other characteristics, which undoubtedly puts forward extremely high standards for the structural stability, electrochemical performance and safety performance of the battery. Therefore, it is urgent to develop an electrochemical test system that can accurately simulate the deep-sea environment to comprehensively evaluate and real-time monitor the performance of the battery and the structural evolution of the key materials, so as to provide key feedback for the optimized design and continuous improvement of the electrochemical performance of the battery.

[0003] According to the simulation of the full-sea depth pressure battery performance test device and method with the authorization announcement number CN107589376B, it can be known that the patent is the known prior art, and the patent can simulate the full-sea depth environment under the pressure of 100 MPa and low temperature by using the pressure gauge and the pressurized tank, and can test the change of the electrical parameters of the deep-sea submersible battery with the depth. However, the technical scheme of the patent still has the following defects in the actual use process: that is, the device cannot comprehensively characterize the working state of the battery and the structural evolution of the key materials from the microscale (the internal materials of the battery cell) to the macroscale (the overall structure of the battery), so that the researchers are difficult to obtain the complete performance data of the battery under the deep-sea working condition, and cannot accurately analyze the performance degradation mechanism and the structural failure reason of the battery, which seriously restricts the research and development process of the deep-sea battery. SUMMARY

[0004] The purpose of the application is to provide a battery performance test system based on deep-sea low-temperature super-high pressure environment to solve the problems in the background art.

[0005] To achieve the above purpose, the application provides the following technical scheme: a battery performance test system based on deep-sea low-temperature super-high pressure environment, comprising a control console and a test cabin, wherein a demodulator and an electrochemical tester are integrated on the control console, a watertight connector is arranged in the test cabin, and plug-in interfaces are arranged at both ends of the watertight connector.

[0006] One end of the plug-in interface is connected with a test battery, and the other end of the plug-in interface is sealingly connected with an electrochemical tester outside the test cabin.

[0007] The test cabin is also provided with a distributed optical fiber sensor and a macroscopic monitoring module.

[0008] As a preferred implementation form, the optical fiber probe of the distributed optical fiber sensor is implanted in the cell of the test battery, the optical fiber transmission line is connected with the water-tight connector, and then extends to the outside of the test cabin and is connected with the control console.

[0009] As a preferred implementation form, the macro monitoring module comprises an underwater lamp, an underwater camera, a laser range finder and an infrared temperature measuring instrument, the underwater lamp, the underwater camera and the laser range finder are arranged on the same fixing ring, and the fixing ring is fixed in the internal space of the test cabin.

[0010] As a preferred implementation form, the test cabin is further provided with a constant temperature maintaining unit, the constant temperature maintaining unit is composed of a refrigeration sheet and a heating sheet, and the refrigeration sheet and the heating sheet are installed on the inner wall surface of the test cabin in a close manner.

[0011] As a preferred implementation form, a support disc is fixedly arranged in the middle lower area in the internal space of the test cabin, a plurality of groups of springs are arranged on the support disc, a plurality of groups of the springs jointly support a bearing disc, and the test battery is installed on the upper surface of the bearing disc.

[0012] As a preferred implementation form, the test cabin is provided with a sealing cover, two groups of electric drive push rods are symmetrically installed on the sealing cover, and the strokes of the two groups of electric drive push rods all pass through the pressure-resistant sealing interfaces prearranged on the sealing cover and extend to the internal space of the test cabin.

[0013] As a preferred implementation form, two groups of adjusting cylinders are further arranged on the bearing disc, one end of each of the two groups of adjusting cylinders is provided with a movable column, and the two groups of adjusting cylinders are rotatably arranged in the movable cavities prearranged on the bearing disc in cooperation with the movable columns at one end.

[0014] As a preferred implementation form, a gear groove is integrally formed on the outer wall of each of the two groups of adjusting cylinders, a reciprocating motor is arranged at the center position of the bearing disc, a transmission gear is fixedly arranged at the output end of the reciprocating motor, and the transmission gear is engaged with the gear grooves of the adjusting cylinders at two ends.

[0015] As a preferred implementation form, a plurality of groups of through holes are arranged on the bearing disc, a motor mounting groove is arranged at the back end of the bearing disc, and the reciprocating motor is sealingly mounted in the motor mounting groove.

[0016] As a preferred implementation form, a support table is arranged below the test cabin, and the support table is arranged between the U-shaped frames.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The battery performance test system based on the deep-sea low-temperature super-high pressure environment breaks the limitation of single function of the prior art by cooperation of the console, the test cabin, the watertight connector, the electrochemical tester, the distributed optical fiber sensor and the macroscopic monitoring module. The watertight connector guarantees the transmission of electrochemical and optical signal parameters, the distributed optical fiber sensor is implanted into the battery cell to realize internal strain temperature monitoring, and the macroscopic monitoring module realizes appearance and size monitoring through fixed ring integrated design. The three can synchronously obtain the battery electrochemical performance, the micro material state (such as the internal strain of the battery cell) and the macro geometric structure change (such as the appearance bulging and size compression) data, and provide multi-scale data support from inside to outside for the researchers.

[0019] The battery performance test system based on the deep-sea low-temperature super-high pressure environment can drive the bearing disc downward by the electric drive push rod until the bearing disc moves to the center position of the test cabin, because of the boundary gradient effect of the high pressure and low temperature environment in the test cabin, the pressure fluctuation and temperature deviation are large near the cabin wall or the sealing cover, and the environmental parameters in the central area are more stable. The bearing disc (and the test battery) is moved to the center position by the electric drive push rod, so that the battery is completely in the uniform deep-sea simulation environment, and the test error caused by the uneven local environment is avoided.

[0020] The battery performance test system based on the deep-sea low-temperature super-high pressure environment can simulate the dynamic state of the battery when the deep-sea operating equipment changes the posture, for example, realize the reciprocating rotation of ± 15° at a preset frequency (such as 0.5Hz), reproduce the stress and posture change of the battery when the equipment swings in the water flow. In this process, the electrochemical performance, micro strain and macro structure stability of the battery in the dynamic state can be monitored synchronously, the test data obtained are closer to the real service working condition of the battery, and more engineering guiding significance data support is provided for the structure optimization and performance improvement of the deep-sea battery, so that the misjudgment of the battery research and development direction caused by the deviation of the static test data is avoided.

[0021] The reciprocating motor is sealedly installed in the motor installation groove of the bearing disc, so that the high-salt solution can be prevented from penetrating into the equipment to damage the equipment and prolong the service life of the motor. The bearing disc is provided with a through hole, so that the solution circulation in the cabin can be realized, the salt concentration around the battery is ensured to be uniform, and the influence of local concentration difference on the test result is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Overall schematic diagram of the structure of the present application;

[0023] Figure 2 Schematic diagram of the initial installation state of the test battery of the structure of the present application;

[0024] Figure 3 Schematic diagram of the structure of the test battery falling to the center position of the test cabin of the structure of the present application;

[0025] Figure 4 Schematic diagram of the support disc, bearing disc and test battery installation structure of the structure of the present application;

[0026] Figure 5 Schematic diagram of the back end structure of the bearing disc of the structure of the present application;

[0027] Figure 6 Schematic diagram of the constant temperature maintaining unit structure of the structure of the present application;

[0028] Figure 7 Schematic diagram of the macroscopic monitoring module installation structure of the structure of the present application.

[0029] In the figure: 1, control console; 2, U-shaped frame; 3, support table; 4, test cabin; 41, sealing cover; 5, water-tight connector; 51, plug interface; 6, support disc; 61, spring; 62, electric drive push rod; 621, travel push rod; 7, bearing disc; 71, adjusting cylinder; 711, gear groove; 72, movable column; 73, reciprocating motor; 74, motor mounting groove; 75, through hole; 8, test battery; 81, distributed optical fiber sensor; 9, refrigeration sheet; 91, heating sheet; 10, macroscopic monitoring module; 101, underwater lamp; 102, underwater camera; 103, laser range finder; 104, sapphire cabin. DETAILED DESCRIPTION

[0030] The present application will be further described below in combination with examples.

[0031] The following examples are used to illustrate the present application, but cannot be used to limit the protection scope of the present application. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements of the method of the present application under the concept of the present application all belong to the protection scope of the present application.

[0032] Please refer to Figures 1-7The application provides a battery performance test system based on deep-sea low-temperature ultrahigh-pressure environment, which comprises a control console 1 and a test cabin 4, the test cabin 4 is equipped with an existing pressure control system (which is a prior art and not shown in the figure), which is used for controlling the pressure in the test cabin 4, so as to simulate the ultrahigh-pressure environment in the deep sea, a support table 3 is arranged below the test cabin 4, the support table 3 is arranged between U-shaped frames 2, a watertight connector 5 is arranged in the test cabin 4, the watertight connector 5 is provided with plug-in interfaces 51 at two ends, one end of the plug-in interface 51 is connected with a test battery 8, and the other end of the plug-in interface 51 is sealingly connected with an electrochemical tester (which is a prior art and not shown in the figure) outside the test cabin 4, the test cabin 4 is also provided with a distributed optical fiber sensor 81 and a macroscopic monitoring module 10, the optical fiber probe of the distributed optical fiber sensor 81 is implanted into the battery cell of the test battery 8, the optical fiber transmission line extends to the outside of the test cabin 4 and is connected with a signal processor in the control console 1, and the macroscopic monitoring module 10 comprises an underwater lamp 101, an underwater camera 102, a laser range finder 103 and an infrared temperature measuring instrument.

[0033] In the embodiment, by integrating the distributed optical fiber sensor 81 and the macroscopic monitoring module 10, multiple test capabilities can be formed, wherein by implanting the probe of the distributed optical fiber sensor 81 into the test battery 8, the microstate data (such as tab expansion and diaphragm deformation) of the materials in the battery cell under the deep-sea environment can be directly obtained, the macroscopic monitoring module captures the macroscopic structural information such as the appearance change and size expansion of the battery through the underwater camera 102 and the laser range finder 103, and cooperates with the electrochemical tester connected through the watertight connector 5 to synchronously collect performance parameters such as charge and discharge capacity and impedance, so that the function limitation of the traditional system is broken through through the cooperation of the three, the researchers can fully master the complete state of the battery from the internal materials to the overall structure, and the problem that the complete performance data is difficult to obtain in the prior art is solved.

[0034] The electrochemical tester adopts the existing CE-5008-20V10A-SMB of Xinwei, the distributed optical fiber sensor 81 adopts the existing high spatial resolution series YOFC-SBOA10002 sensor, the underwater lamp 101 adopts the existing high-performance underwater LED lamp of OceanTools company, the underwater camera 102 adopts the existing C4 series high-definition Internet protocol camera of OceanTools company, and the laser range finder 103 adopts the existing SXLR-10 series range finder, and the specific working principles and connection technologies of the above components are not described in detail here.

[0035] Please refer toFigure 1 、 Figure 4 The inside of the test cabin 4 is also provided with a constant temperature maintaining unit, which is composed of a refrigeration sheet 9 and a heating sheet 91. Both the refrigeration sheet 9 and the heating sheet 91 are installed on the inner wall surface of the test cabin 4 in a close manner.

[0036] In this embodiment, since the temperature range of the deep sea environment is about -2℃-10℃, and the battery performance is highly sensitive to temperature, the constant temperature maintaining unit can accurately simulate the temperature conditions at different deep sea depths by the low temperature output of the refrigeration sheet 9 and the fine adjustment of the heating sheet 91 to avoid the distortion of the test scene caused by normal temperature test or temperature deviation.

[0037] Among them, the refrigeration sheet 9 adopts the existing TEC1-12706 series refrigeration plate, and the heating sheet 91 adopts the existing Kheat TM SP silicone heating sheet. Both of them are electrically connected with a temperature control module (REX-C100 series module). The specific working principle and connection mode are not described in detail here.

[0038] Please refer to Figure 3 and Figure 4 A support disc 6 is fixedly arranged in the middle lower area inside the test cabin 4. A plurality of groups of springs 61 are assembled on the support disc 6. The plurality of groups of springs 61 jointly support a bearing disc 7. The test battery 8 is installed on the upper surface of the bearing disc 7. The test cabin 4 is provided with a sealing cover 41. Two groups of electric drive push rods 62 are symmetrically installed on the sealing cover 41. The strokes of the push rods 621 of the two groups of electric drive push rods 62 all pass through the pre-designed pressure-resistant sealing interfaces on the sealing cover 41 and extend to the internal space of the test cabin 4.

[0039] In this embodiment, by designing the structural design of the support disc 6, the spring 61, the bearing disc 7 and the electric drive push rod 62 in the test cabin 4, the stroke push rod 621 at the output end of the electric drive push rod 62 can drive the bearing disc 7 to move downward until it moves to the center position of the test cabin 4. Since there is a boundary gradient effect in the high pressure and low temperature environment in the test cabin 4, the area close to the cabin wall or the sealing cover 41 has a large pressure fluctuation and temperature deviation due to the influence of the heat exchange element and the sealing structure. The environmental parameters in the central area are more stable. By moving the bearing disc 7 (and the test battery 8) to the center position by the electric drive push rod 62, the test battery 8 can be completely placed in the uniform deep sea simulation environment, avoiding the test error caused by the uneven local environment.

[0040] Please refer to Figure 3 and Figure 4The bearing disc 7 is further provided with two groups of adjusting cylinders 71, one end of each of the two groups of adjusting cylinders 71 is provided with a movable column 72, the two groups of adjusting cylinders 71 are rotatably arranged in the movable cavities prearranged in the bearing disc 7 through the movable columns 72 at one end, the outer walls of the two groups of adjusting cylinders 71 are integrally formed with tooth grooves 711, the bearing disc 7 is provided with a reciprocating motor 73 at a central position, a transmission tooth is fixedly arranged at the output end of the reciprocating motor 73, and the transmission tooth is meshed with the tooth grooves 711 of the adjusting cylinders 71 at two ends, a plurality of groups of through holes 75 are arranged through the bearing disc 7, and a motor mounting groove 74 is arranged at the back end of the bearing disc 7, and the reciprocating motor 73 is sealingly arranged in the motor mounting groove 74.

[0041] In the embodiment, in actual operation, the deep-sea operation equipment will change the posture due to equipment movement and water flow impact, and the battery will not always be in a static vertical placement state, but will slowly rotate or shake along with the adjustment of the equipment posture. The prior art can only test the battery performance in a static state and cannot simulate this dynamic working condition, resulting in deviation of the test data from the real service scene. The device can simulate the dynamic state of the test battery 8 when the posture of the deep-sea equipment changes through the cooperation of the adjusting cylinder 71 and the reciprocating motor 73. For example, the reciprocating rotation of ±15° is realized at a preset frequency (such as 0.5 Hz), and the stress and posture change of the test battery 8 when the equipment swings in the water flow are reproduced. In this process, the electrochemical performance, micro-strain and macro-structure stability of the test battery 8 in the dynamic state can be monitored synchronously, the test data obtained are closer to the real service working condition of the test battery 8, and more engineering guiding significance data support is provided for the structure optimization and performance improvement of the test battery 8, so that the misjudgment of the battery research and development direction caused by the deviation of the static test data is avoided.

[0042] In the embodiment, the reciprocating motor 73 is sealingly arranged in the motor mounting groove 74 of the bearing disc 7, so that the high-salt solution can be prevented from penetrating into the equipment and damaging the equipment, and the service life of the reciprocating motor 73 is prolonged. The through holes 75 are arranged in the bearing disc 7, so that the solution circulation in the cabin can be realized, the salt concentration around the battery is ensured to be uniform, and the influence of local concentration difference on the test result is avoided.

[0043] The working principle and use process of the application are as follows:

[0044] Firstly, the sealing cover 41 of the test cabin 4 is opened, high-salt simulation solution (salinity 3.5%, simulating seawater composition) is injected into the cabin, until the solution liquid surface is higher than the preset mounting position of the bearing disc 7 (to ensure that the test battery 8 can be completely soaked after being mounted), the connecting line of the electrochemical tester is sealingly connected through the cabin-outside plug-in interface 51 of the water-tight plug-in piece 5, at the same time, the optical fiber probe of the distributed optical fiber sensor 81 is implanted into the battery cell to be tested in advance, and the optical fiber transmission line is arranged to extend along the inner wall of the test cabin 4 to the outside of the cabin and be connected with the signal processor of the control console 1,

[0045] Secondly, the test battery 8 with the embedded optical fiber probe is placed on the upper surface of the bearing disc 7, and then the electric drive push rod 62 is started, and the control stroke push rod 621 pushes the bearing disc 7 downward, and because the bearing disc 7 is supported on the support disc 6 by the spring 61, the spring 61 can buffer the impact force during the pushing process of the push rod, so as to avoid that the internal structure of the battery is damaged due to violent vibration, when the test battery 8 on the bearing disc 7 reaches the center position of the test cabin 4, at this time, the spring 61 has not reached the maximum compression value, and at this time, the underwater lamp 101, the underwater camera 102 and the laser range finder 103 are opposite to the test battery 8 at the center position of the test cabin 4, when the console displays that the bearing disc 7 and the test battery 8 reach the center position of the test cabin 4, the operation of the electric drive push rod 62 is stopped, and the battery position calibration is completed;

[0046] Then, a new fluororubber sealing ring is embedded in the sealing groove of the sealing cover 41, the sealing cover 41 is closed and uniformly fastened by bolts, the initial sealing state of the test cabin 4 is ensured, the pressure control system of the test cabin 4 is started, the pressure is slowly increased to 100 MPa at a rate of 0.5 MPa / min, and the pressure is maintained for 30 minutes, the pressure change is monitored through the console, if the pressure drop is ≤0.01 MPa, it indicates that the cabin body is well sealed, at the same time, the temperature control module is started, and the cooling fin 9 (TEC1-12706 series) and the heating fin 91 (Kheat TM SP silicone heating fin) work cooperatively, the cooling fin 9 operates at full power in the initial stage, the temperature in the cabin is rapidly reduced, when the temperature approaches the target value (such as 4℃±0.5℃), the heating fin 91 starts to heat at low power, and the temperature in the cabin is adjusted to the target interval through the PID algorithm of the REX-C100 temperature control module;

[0047] In this process, the macro monitoring module 10 is started synchronously, the underwater lamp 101 is turned on, the light intensity is adjusted to the underwater camera 102, the whole appearance of the battery can be clearly photographed, the camera screen is previewed through the console 1, it is ensured that there is no visual angle obstruction, the laser range finder 103 is started, the initial size of the battery is sampled for multiple times, and the average value is taken as the reference data, and then the output signal of the distributed optical fiber sensor 81 is checked, it is ensured that the initial strain and temperature data in the battery cell are stable and have no abnormal fluctuation;

[0048] After confirming that the system pre-operation state is normal, continue to increase the pressure in the test cabin 4 to the target value (such as 10 MPa) through the pressure control system, and control the pressure increasing rate at 1 MPa / min to avoid the deformation of the battery shell caused by sudden pressure rise. After the pressure is stable, start the electrochemical tester (CHI 600F series), output the charge and discharge signals to the test battery 8 through the water-tight connector 5, and charge at a preset rate (such as 0.5C) to the rated voltage of the battery, then charge at a constant voltage until the current decreases to 0.05C, and discharge at the same rate to the cut-off voltage. The control console records the charge and discharge curve, capacity decay rate, impedance change and other electrochemical parameters in real time, and automatically stores them to the database

[0049] During the test, the temperature control module continuously monitors the temperature in the cabin to ensure that the temperature is always stable within the target interval ±0.5℃, avoiding the influence of temperature fluctuations on the accuracy of electrochemical test data. The distributed optical fiber sensor 81 (YOFC-SBOA10002) collects internal data of the battery throughout the test, captures the expansion and contraction strain of the pole piece during the charge and discharge process through the optical fiber probe, and reflects the structural evolution of the internal materials of the battery through the data curve generated after processing the data transmitted in real time through the optical fiber transmission line to the signal processor of the control console 1.

[0050] The macro monitoring module 10 operates at a preset interval, the underwater camera 102 takes a picture of the battery appearance every 30 minutes, and focuses on recording whether the battery has bulges, shell rupture, electrolyte leakage and other phenomena. The image is automatically labeled with the shooting time and the corresponding test period. The laser range finder 103 measures the size of the battery every 1 hour, calculates the size expansion rate, and correlates it with the electrochemical data.

[0051] At the same time, the dynamic simulation function of the reciprocating motor 73 is started, and the motor is controlled to drive the adjusting cylinder 71 and the battery to realize ±15° reciprocating rotation at a frequency of 0.5Hz, simulating the working condition of the deep-sea equipment shaking in the water flow. During this dynamic process, the control console 1 synchronously records the electrochemical parameters, micro-strain and macro-stability, compares the test data difference between dynamic and static working conditions, evaluates the adaptability of the battery in the real service scenario, and finally, when the number of electrochemical test cycles reaches the preset value (such as 50 times), first stop the operation of the reciprocating motor 73 and the macro monitoring module 10, turn off the underwater lamp 101 and the laser range finder 103, then start the pressure relief program of the test cabin 4, slowly reduce the pressure to normal pressure at a rate of 0.3 MPa / min, and at the same time, turn off the refrigerating fin 9 and only keep the heating fin 91 running at low power. After the test cabin 4 is completely depressurized and the temperature returns to room temperature, open the sealing cover 41, start the electric drive push rod 62 to control the travel push rod 621 to retract upwards, reset the bearing disc 7, and take out the battery.

[0052] It should be noted that the pressure relief operation adopted by the test cabin 4 in this step is the core working principle of the conventional technical means in the field of deep-sea high-pressure testing, and the related technical details have been clearly recorded in the existing literature and equipment manual in this field, therefore, this paper will not expand the detailed elaboration.

[0053] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences, modifications, replacements and variations of the embodiments, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A battery performance test system based on deep-sea low-temperature ultrahigh-pressure environment, comprising a control console (1) and a test cabin (4), characterized in that: The control console is integrated with a demodulator and an electrochemical tester, and a watertight connector (5) is arranged in the test cabin (4), and the watertight connector (5) is provided with a plug-in interface (51) at both ends. One end of the plug-in interface (51) is connected with the test battery (8), and the other end of the plug-in interface (51) is sealingly connected with the electrochemical tester outside the test cabin (4). The test cabin (4) is also provided with a distributed optical fiber sensor (81) and a macroscopic monitoring module (10).

2. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 1, characterized in that: The optical fiber probe of the distributed optical fiber sensor (81) is implanted in the battery cell of the test battery (8), the optical fiber transmission line is connected with the watertight connector (5), then extends to the outside of the test cabin (4), and is connected with the control console (1).

3. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 2, characterized in that: The macroscopic monitoring module (10) comprises an underwater lamp (101), an underwater camera (102), a laser range finder (103) and an infrared thermometer, the underwater lamp (101), the underwater camera (102), the laser range finder (103) and the infrared thermometer are independently assembled in the sapphire cabin (104) fixedly arranged on the fixed ring, and the fixed ring is fixed in the internal space of the test cabin (4).

4. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 3, characterized in that: The test cabin (4) is also provided with a constant temperature maintaining unit, which is composed of a refrigerating fin (9) and a heating fin (91), and the refrigerating fin (9) and the heating fin (91) are installed on the inner wall surface of the test cabin (4) in a close manner.

5. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 4, characterized in that: A support disc (6) is fixedly arranged in the lower middle region of the internal space of the test cabin (4), a plurality of groups of springs (61) are assembled on the support disc (6), a plurality of groups of the springs (61) jointly support a bearing disc (7), and the test battery (8) is installed on the upper surface of the bearing disc (7).

6. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 5, characterized in that: The test cabin (4) is provided with a sealing cover (41), two groups of electric drive push rods (62) are symmetrically installed on the sealing cover (41), the stroke push rods (621) of the two groups of electric drive push rods (62) penetrate through the pressure-resistant sealing interfaces (42) prearranged on the sealing cover (41) and extend to the internal space of the test cabin (4).

7. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 5, characterized in that: Two groups of adjusting cylinders (71) are arranged on the bearing disc (7), one end of each of the two groups of adjusting cylinders (71) is provided with a movable column (72), and the two groups of adjusting cylinders (71) are rotatably arranged in the movable cavities prearranged on the bearing disc (7) in cooperation with the movable columns (72) at one end.

8. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 7, characterized in that: The outer walls of the two groups of adjusting cylinders (71) are integrally formed with tooth grooves (711), a reciprocating motor (73) is arranged at the center position of the bearing disc (7), a transmission tooth is fixedly arranged at the output end of the reciprocating motor (73), and the transmission tooth is engaged with the tooth grooves (711) of the adjusting cylinders (71) at both ends.

9. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 8, characterized in that: A plurality of groups of through holes (75) are arranged on the bearing disc (7), a motor mounting groove (74) is arranged at the back end of the bearing disc (7), and the reciprocating motor (73) is sealingly mounted in the motor mounting groove (74).

10. The battery performance test system based on deep-sea low-temperature and ultra-high pressure environment according to claim 1, characterized in that: A support table (3) is arranged below the test cabin (4), and the support table (3) is arranged between the U-shaped frames (2).

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