Lithium battery extrusion test system and method

Abstract

The invention belongs to the technical field of lithium battery tests, and particularly relates to a lithium battery extrusion test system which comprises a control module, an execution mechanism, a data acquisition system, a pressure test module, a stroke test module, an anti-explosion high-speed camera, an operation table and a smoke detection module. The control signal output end of the control module is connected with the control signal input end of the execution mechanism, the execution mechanism is used for extruding a lithium battery, and the signal input end of the data acquisition system is connected with the signal output ends of the pressure test module, the stroke test module, the anti-explosion high-speed camera and the smoke detection module. The test end of the pressure test module is connected with the execution mechanism, and the test end of the stroke test module is connected with the execution mechanism. The invention also provides a lithium battery extrusion test method. The technical problems that the lithium battery extrusion test is low in automation level and single in test index are solved, and the lithium battery extrusion test inspection capability and test efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery test, in particular to a lithium battery extrusion test system and method. BACKGROUND

[0002] Lithium battery is a kind of battery with lithium metal or lithium alloy as positive / negative electrode material and non-aqueous electrolyte solution. Lithium battery extrusion test is used to simulate the situation that lithium battery is extruded by external force or penetrated by sharp object during transportation, use and storage. The existing lithium battery extrusion test system can realize the adjustment of extrusion pressure and stroke, meet the requirements of national standards and be suitable for type test result judgment. However, the existing lithium battery extrusion test system cannot realize the monitoring of battery deformation and explosion flame, is not suitable for product research and development process test and type test result analysis, and is not conducive to the development of lithium battery detection and inspection intelligent technology. SUMMARY

[0003] In order to solve the above problems, the purpose of the present application is to provide a lithium battery extrusion test system and method.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is: a lithium battery extrusion test system, comprising a control module, an actuator, a data acquisition system, a pressure test module, a stroke test module, a high-speed camera with explosion-proof function, an operation table and a smoke detection module.

[0005] The control signal output end of the control module is connected with the control signal input end of the actuator, the actuator is used for extruding the lithium battery, the signal input end of the data acquisition system is connected with the signal output end of the pressure test module, the stroke test module, the high-speed camera with explosion-proof function and the smoke detection module respectively, the test end of the pressure test module is connected with the actuator, the test end of the stroke test module is connected with the actuator, the test end of the high-speed camera with explosion-proof function is opposite to the lithium battery extrusion test area, the fixed end of the actuator and the high-speed camera with explosion-proof function is connected with the operation table respectively, and the test end of the smoke detection module is located above the lithium battery side.

[0006] Further, a smoke treatment module is further included, and the control end of the smoke treatment module is connected with the signal output end of the control module.

[0007] Further, the actuator comprises a linear motor, a driving system and an extrusion terminal, the control signal input end of the driving system is connected with the control signal output end of the control module, the three-phase winding of the linear motor is connected with the voltage output end of the driving system, the position detection end of the linear motor is connected with the position detection signal input end of the driving system, one end of the extrusion terminal is connected with the operation table, and the other end of the extrusion terminal is connected with the main shaft of the linear motor; the extrusion terminal is further connected with the test end of the pressure test module.

[0008] Further, the stroke test module comprises a range finder and a displacement sensor, the fixed end of the displacement sensor is connected with the operation table, the test end of the displacement sensor is connected with the main shaft of the linear motor, the fixed end of the range finder is connected with the extrusion terminal during distance test, the fixed end of the range finder is connected with the operation table when distance test is not needed, the signal output ends of the range finder and the displacement sensor are connected with the signal input ends of the data acquisition system respectively.

[0009] Further, the explosion-proof high-speed camera comprises an explosion-proof shell and a high-speed camera, the fixed end of the explosion-proof shell is connected with the operation table, the fixed end of the high-speed camera is connected with the explosion-proof shell, the test end of the high-speed camera is opposite to the observation window of the explosion-proof shell, and the signal output end of the high-speed camera is connected with the signal input end of the data acquisition system.

[0010] The application also provides a lithium battery extrusion test method, which is realized by using the lithium battery extrusion test system.

[0011] Step S1, integrity check of the lithium battery extrusion test system, the lithium battery is placed on the test position of the operation table;

[0012] Step S2, start of the lithium battery extrusion test system, the fixed end of the range finder is connected with the extrusion terminal;

[0013] Step S3, distance test of the lithium battery to the range finder by the range finder, and data transmission to the data acquisition system;

[0014] Step S4, the fixed end of the range finder is connected with the operation table, and the extrusion test parameters are set;

[0015] Step S5, extrusion test operation, the pressure test module, the stroke test module and the smoke detection module respectively monitor and record the pressure, stroke and smoke test parameters in the test process in real time, the explosion-proof high-speed camera simultaneously captures the state of the lithium battery in real time and uploads to the data acquisition system, whether explosion and fire occur is judged, and if explosion and fire occur, the smoke treatment module is started under the control of the control module;

[0016] Step S6, the test parameters and the state of the lithium battery captured by the data acquisition system are collected and calculated, and the deformation amount of the lithium battery is calculated;

[0017] Step S7, the lithium battery extrusion test system is restored, and the test is completed.

[0018] Further, the calculation formula of the deformation amount in step S6 is:

[0019] Delta L = L - M - N (1)

[0020] Wherein, AL represents deformation, unit: mm; L represents extrusion terminal displacement, unit: mm; M represents the distance from the lithium battery to the range finder, unit: mm; N represents the height of the range finder, unit: mm.

[0021] Further, the extrusion terminal displacement L and the distance M from the lithium battery to the range finder are measured by the stroke test module.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The present application provides a lithium battery extrusion test system and method, which adopts modular design and integrates a multi-parameter real-time monitoring system, including a pressure test module, a stroke test module, a smoke detection module and a high-speed explosion-proof camera, comprehensively collects pressure, displacement, smoke concentration and battery deformation image data, solves the technical problems of low automation level and single test index of lithium battery extrusion test, improves the lithium battery extrusion test inspection capability and test efficiency, introduces lithium battery deformation calculation, accurately quantifies the battery deformation, improves the detection accuracy, ensures the lithium battery product quality, and promotes the sustainable and healthy development of detection and inspection and lithium battery industry. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a lithium battery extrusion test system structure schematic diagram of the present application;

[0025] Figure 2 is a connection structure schematic diagram of the actuator and the stroke test module of the present application;

[0026] Figure 3 is a lithium battery extrusion test method flow chart of the present application;

[0027] In the figure, 1, control module, 2, actuator, 21, linear motor, 22, drive system, 23, extrusion terminal, 3, data acquisition system, 4, pressure test module, 5, stroke test module, 51, range finder, 52, displacement sensor, 6, high-speed explosion-proof camera, 7, operation table, 8, smoke detection module, 9, smoke treatment module, 10, lithium battery. DETAILED DESCRIPTION

[0028] The following examples are used to illustrate the present application, but not to limit the scope of the application.

[0029] Example 1

[0030] As shown in Figures 1-2 , the lithium battery extrusion test system comprises a control module 1, an actuator 2, a data acquisition system 3, a pressure test module 4, a stroke test module 5, a high-speed explosion-proof camera 6, an operation table 7 and a smoke detection module 8.

[0031] The control signal output end of the control module 1 is connected with the control signal input end of the actuator 2, the actuator 2 is used for extruding the lithium battery, the signal input end of the data acquisition system 3 is connected with the signal output end of the pressure test module 4, the stroke test module 5, the explosion-proof high-speed camera 6 and the smoke detection module 8 respectively, the test end of the pressure test module 4 is connected with the actuator 2, the test end of the stroke test module 5 is connected with the actuator 2, the test end of the explosion-proof high-speed camera 6 is opposite to the extrusion test area of the lithium battery 10, the fixed end of the actuator 2 and the explosion-proof high-speed camera 6 is connected with the operation table 7 respectively, and the test end of the smoke detection module 8 is located above the lithium battery 10.

[0032] The smoke treatment module 9 is further included, and the control end of the smoke treatment module 9 is connected with the signal output end of the control module 1.

[0033] The actuator 2 includes a linear motor 21, a driving system 22 and an extrusion terminal 23, the control signal input end of the driving system 22 is connected with the control signal output end of the control module 1, the three-phase winding of the linear motor 21 is connected with the voltage output end of the driving system 22, the position detection end of the linear motor 21 is connected with the position detection signal input end of the driving system 22, one end of the extrusion terminal 23 is connected with the operation table 7, and the other end of the extrusion terminal 23 is connected with the main shaft of the linear motor 21; the extrusion terminal 23 is further connected with the test end of the pressure test module 4. The pressure test module 4 measures the pressure of the extrusion terminal 23.

[0034] The stroke test module 5 includes a range finder 51 and a displacement sensor 52, the fixed end of the displacement sensor 52 is connected with the operation table 7, the test end of the displacement sensor 52 is connected with the main shaft of the linear motor 21, when the range finder 51 is used for distance test, the fixed end of the range finder 51 is connected with the extrusion terminal 23, when the range finder 51 is not used for distance test, the fixed end of the range finder 51 is connected with the operation table 7, and the signal output end of the range finder 51 and the displacement sensor 52 is connected with the signal input end of the data acquisition system 3 respectively. In the embodiment, the range finder 51 is a laser range finder 51.

[0035] The explosion-proof high-speed camera 6 includes an explosion-proof shell and a high-speed camera, the fixed end of the explosion-proof shell is connected with the operation table 7, the fixed end of the high-speed camera is connected with the explosion-proof shell, the test end of the high-speed camera is opposite to the observation window of the explosion-proof shell, and the signal output end of the high-speed camera is connected with the signal input end of the data acquisition system 3.

[0036] Embodiment two

[0037] Reference Figure 3, the lithium battery extrusion test method is realized by using the lithium battery extrusion test system described in embodiment one, and specifically includes the following steps:

[0038] Step S1, the lithium battery extrusion test system integrity check, the lithium battery 10 is placed in the test position;

[0039] Step S2, the lithium battery 10 extrusion test system starts, the fixed end of the range finder 51 is connected with the extrusion terminal 23;

[0040] Step S3, the distance between the lithium battery 10 and the range finder 51 is tested by the range finder 51, and the data is transmitted to the data acquisition system 3;

[0041] Step S4, the fixed end of the range finder 51 is connected with the operation table 7, and the extrusion test parameters are set;

[0042] Step S5, the extrusion test operation is carried out, the control module 1 controls the driving system 22 in the actuator 2 to act, so that the linear motor 21 drives the extrusion terminal 53 to move, extruding the lithium battery 10, the pressure test module 4, the stroke test module 5 and the smoke detection module 8 respectively monitor and record the pressure, stroke and smoke test parameters in the test process in real time, at the same time, the explosion-proof high-speed camera 6 shoots the state of the lithium battery 10 in real time, and uploads to the data acquisition system 3, judges whether explosion and fire occur, if explosion and fire occur, the control module 1 controls the smoke treatment module 9 to start;

[0043] Step S6, the data acquisition system 3 collects and calculates the test parameters and the state of the lithium battery 10, and calculates the deformation amount of the lithium battery 10;

[0044] Step S7, the lithium battery extrusion test system is restored, and the test is completed.

[0045] The calculation formula of the deformation amount in step S6 is:

[0046] ΔL=L-M-N (1)

[0047] In the formula, ΔL represents the deformation amount, the unit is mm; L represents the displacement of the extrusion terminal 53, the unit is mm; M represents the distance between the lithium battery 10 and the range finder 51, the unit is mm; N represents the height of the range finder 51 (the height of the range finder 51 itself), the unit is mm.

[0048] The displacement L of the extrusion terminal 53 and the distance M between the lithium battery 10 and the range finder 51 are measured by the stroke test module 5. Specifically, the displacement L of the extrusion terminal 53 is measured by the displacement sensor 52, and the distance M between the lithium battery 10 and the range finder 51 is measured by the range finder 51.

[0049] The application solves the technical problems of low automation level and single test index of the lithium battery extrusion test, improves the lithium battery extrusion test inspection capability and test efficiency. Moreover, the lithium battery deformation amount calculation formula is introduced, the battery deformation amount is accurately quantified, the detection accuracy is improved, the lithium battery product quality is ensured, and the continuous and healthy development of the detection inspection and the lithium battery industry is promoted.

[0050] Although the application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the application, all belong to the scope of the application claimed.

Claims

1. A lithium battery extrusion testing system, characterized in that, It includes a control module, actuator, data acquisition system, pressure testing module, stroke testing module, explosion-proof high-speed camera, control panel, and smoke detection module; The control signal output terminal of the control module is connected to the control signal input terminal of the actuator. The actuator is used to squeeze the lithium battery. The signal input terminal of the data acquisition system is connected to the signal output terminals of the pressure test module, the stroke test module, the explosion-proof high-speed camera, and the smoke detection module, respectively. The test terminal of the pressure test module is connected to the actuator. The test terminal of the stroke test module is connected to the actuator. The test terminal of the explosion-proof high-speed camera is facing the lithium battery squeezing test area. The fixed terminals of the actuator and the explosion-proof high-speed camera are connected to the operating table, respectively. The test terminal of the smoke detection module is located above the lithium battery side.

2. The lithium battery extrusion testing system as described in claim 1, characterized in that, It also includes a smoke treatment module, the control terminal of which is connected to the signal output terminal of the control module.

3. The lithium battery extrusion testing system as described in claim 1, characterized in that, The actuator includes a linear motor, a drive system, and an extrusion terminal. The control signal input terminal of the drive system is connected to the control signal output terminal of the control module. The three-phase winding of the linear motor is connected to the voltage output terminal of the drive system. The position detection terminal of the linear motor is connected to the position detection signal input terminal of the drive system. One end of the extrusion terminal is connected to the operating table, and the other end of the extrusion terminal is connected to the main shaft of the linear motor. The extrusion terminal is also connected to the test terminal of the pressure testing module.

4. The lithium battery extrusion testing system as described in claim 1, characterized in that, The travel test module includes a rangefinder and a displacement sensor. The fixed end of the displacement sensor is connected to the operating table, and the test end of the displacement sensor is connected to the spindle of the linear motor. When the distance is being tested, the fixed end of the rangefinder is connected to the extrusion terminal. When the distance is not being tested, the fixed end of the rangefinder is connected to the operating table. The signal output ends of the rangefinder and the displacement sensor are respectively connected to the signal input end of the data acquisition system.

5. The lithium battery extrusion testing system as described in claim 1, characterized in that, The explosion-proof high-speed camera includes an explosion-proof housing and a high-speed camera. The fixed end of the explosion-proof housing is connected to the operating table, the fixed end of the high-speed camera is connected to the explosion-proof housing, the test end of the high-speed camera faces the observation window of the explosion-proof housing, and the signal output end of the high-speed camera is connected to the signal input end of the data acquisition system.

6. The test method for the lithium battery extrusion test system, implemented using the lithium battery extrusion test system as described in claim 2, characterized in that, Specifically, the following steps are included: Step S1: Check the integrity of the lithium battery crush test system by placing the lithium battery on the test position on the operating table. Step S2: The lithium battery extrusion test system is started, and the fixed end of the rangefinder is connected to the extrusion terminal; Step S3: Measure the distance from the lithium battery to the rangefinder using a rangefinder, and transmit the data to the data acquisition system; Step S4: Connect the fixed end of the rangefinder to the operating table and set the compression test parameters; Step S5: Perform the extrusion test. The pressure test module, stroke test module, and smoke detection module monitor and record the pressure, stroke, and smoke test parameters in real time during the test. At the same time, the explosion-proof high-speed camera captures the status of the lithium battery in real time and uploads it to the data acquisition system to determine whether an explosion or fire has occurred. If an explosion or fire occurs, the control module controls the smoke treatment module to start. Step S6: The data acquisition system collects and processes the test parameters and the captured images of the lithium battery's state to calculate the deformation of the lithium battery. Step S7: Restore the lithium battery compression test system to complete the test.

7. The test method of the lithium battery extrusion test system as described in claim 6, characterized in that, The formula for calculating the deformation in step S6 is as follows: ΔL=LMN (1) In the formula, ΔL represents the deformation in mm; L represents the displacement of the extrusion terminal in mm; M represents the distance from the lithium battery to the rangefinder in mm; and N represents the height of the rangefinder in mm.

8. The test method of the lithium battery extrusion test system as described in claim 6, characterized in that, The displacement L of the extrusion terminal and the distance M from the lithium battery to the rangefinder are measured by the stroke test module.

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