CN112393999B - Hardness testing device and method for soft-package battery - Google Patents
Hardness testing device and method for soft-package battery Download PDFInfo
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- CN112393999B CN112393999B CN202010779638.5A CN202010779638A CN112393999B CN 112393999 B CN112393999 B CN 112393999B CN 202010779638 A CN202010779638 A CN 202010779638A CN 112393999 B CN112393999 B CN 112393999B
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- 238000007542 hardness measurement Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title description 15
- 238000012360 testing method Methods 0.000 claims abstract description 203
- 238000003825 pressing Methods 0.000 claims abstract description 112
- 238000006073 displacement reaction Methods 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004445 quantitative analysis Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 abstract description 19
- 239000004033 plastic Substances 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/48—Investigating hardness or rebound hardness by performing impressions under impulsive load by indentors, e.g. falling ball
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The hardness testing device for the soft package battery comprises a base, wherein a rack is arranged on the base, a moving platform and a pressing testing mechanism are arranged on the rack, the pressing testing mechanism comprises a control unit, the pressing testing mechanism comprises a pressing head which is arranged corresponding to the base, a force sensor is arranged on the pressing head, and a signal output end of the force sensor is connected with a signal input end of the control unit. Performing lamination test on the battery to be tested by using a lamination test mechanism, locally extruding the surface of the soft-packaged battery by using a lamination head with preset pressure, analyzing the plastic deformation state of the surface of the battery, and quantitatively characterizing the hardness of the soft-packaged battery; and the touch panel is used for controlling the vibration motor to drive the pressing head to vibrate at high frequency, and the thickness sensor which is annularly arranged at the periphery of the soft package battery can test the edge amplitude of the soft package battery and record the amplitude difference value of each point at the outer edge of the soft package battery, so that the uniformity of the soft package battery is tested.
Description
Technical Field
The invention relates to the technical field of battery measurement, in particular to a hardness testing device and method for a soft package battery.
Background
Lithium ion batteries have been rapidly developed in recent years as power sources for mobile phones, portable computers, personal data assistants, hand-held terminals, power sources, and the like, and have also made higher demands for the energy density of the batteries. Besides the advantages and advantages of the metal shell battery, the soft package lithium ion battery has the advantages of being capable of being thinned, being capable of being formed into any area, being formed into any shape and the like, and the volume capacity density and the weight energy density are improved by more than 10% -20%. However, the soft-package lithium ion battery is soft in surface and easy to deform due to raw material materials, liquid injection amount, production process and the like, and is unfavorable for subsequent grouping assembly because of softer battery for the lithium ion battery with large length and width and thinner thickness. Particularly, as the mobile electronic products are lighter and thinner, the required thickness of the lithium ion battery is thinner, and the requirements on the appearance flatness and hardness of the lithium ion battery are higher.
The traditional hardness test method comprises a Brinell hardness method, a Rockwell hardness method, a surface Rockwell hardness method, a Vickers hardness method, a micro Vickers hardness method and a small-load Vickers hardness method, and the pressure head in the traditional test method comprises a steel ball, a diamond cone and a diamond square cone. The traditional hardness test method is suitable for hardness detection of metal materials and is not suitable for soft-package lithium ion batteries.
The Chinese patent publication No. CN 103364291A discloses a hardness tester, which comprises a horizontal shifter, an image shooting device, a switcher, a memory, a table displacement controller and the like, wherein a tester pressure head applies a preset test force to a sample placed on a sample table, an indentation is formed on the surface of the sample, and the size and the hardness of the indentation are measured and represented.
The Chinese patent of invention with publication date of 2014, 7 and 30 discloses a hardness tester, the publication number of which is CN 103954515A, which comprises a support tube, a hardness sensor, a magnetic test body arranged in the support tube in a sliding manner, and a transmission device arranged in the support tube, wherein the transmission device drives the magnetic test body to impact the surface of a workpiece, a rebound coil generates current, and the hardness value of the workpiece is further calculated according to the impact speed and the rebound current.
The utility model patent in China, the application publication date of which is 2018, 8 and 27, discloses a hardness testing device of a flexible package lithium ion battery, and the publication number CN 209303228U of the hardness testing device comprises a base, a testing device and a pressure measuring device, and is characterized in that the base is used for supporting and fixing the battery to be tested, the testing device comprises a laser emitting device and a laser receiving device, the laser emitting device and the laser receiving device are positioned on two sides of a bottom plate and used for providing stable pressure for the battery to be tested, the laser emitting device emits laser to pass through the lower part of the battery to be tested, and the hardness of the battery to be tested is not in accordance with the requirement when the battery to be tested is bent to the laser.
The Chinese patent of invention with publication date 2018, 10 month and 24 days discloses a hardness testing device of a soft package lithium ion battery, the publication number CN209311234U of which comprises a bottom plate, a fixing device, a pressing block limiting device, a pressing block and a thickness tester, wherein the pressing block is used for providing stable pressure for the battery, and the thickness tester is used for judging whether the hardness of the battery meets the requirement.
The traditional hardness test method is not suitable for soft-package lithium batteries, but the related patent and literature aiming at soft-package lithium batteries can not realize quantitative hardness test of soft-package lithium batteries.
Disclosure of Invention
The invention provides a hardness testing device and method for a soft-package battery, which are used for testing the hardness of the soft-package battery by using a pressing testing mechanism, locally extruding the surface of the soft-package battery through a pressing head with preset pressure, analyzing the plastic deformation state of the surface of the battery and quantitatively characterizing the hardness of the soft-package battery.
The second invention aims to test the uniformity of the soft-packaged battery by using the soft-packaged battery hardness testing device, and because the soft-packaged battery is of a multi-layer wrapping structure and comprises a positive plate, a diaphragm layer, a negative plate, an aluminum plastic film and other different material layers, the problem of poor uniformity of the plates can occur in the production and superposition processes, the phenomenon of uneven density of the soft-packaged battery can influence parameters such as heat dissipation performance, charge and discharge performance and the like of the battery, and the quality of the battery is determined, but related patents for diagnosing the uniformity of the soft-packaged battery are not found.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the hardness testing device for the soft package battery comprises a base, wherein a rack is arranged on the base, a moving platform and a pressing testing mechanism are arranged on the rack, the pressing testing mechanism comprises a control unit, the pressing testing mechanism comprises a pressing head which is arranged corresponding to the base, a force sensor is arranged on the pressing head, and a signal output end of the force sensor is connected with a signal input end of the control unit. The control unit of the soft package battery hardness testing device collects signals of the force sensor and controls the pressure of the pressing head through the driving motor, so that the pressure value in the hardness testing process is controlled to be variable, the soft package battery to be tested is subjected to local hardness testing by means of the rated pressure value, and quantitative hardness detection of the soft package battery is achieved by analyzing the deformation degree of the surface of the battery.
Preferably, the top end of the frame is provided with an organic table, the machine table is provided with a test rod in a penetrating manner, the pressing head is arranged at the bottom end of the test rod, the machine table is provided with a driving motor, and a transmission part is arranged between the driving motor and the top end of the test rod.
Further, the test rod is in threaded connection with the machine table, the movable platform is movably sleeved on the machine frame, the movable platform is connected with the test rod, and a supporting piece is arranged between the test rod and the movable platform.
Further, the frame comprises a plurality of guide rods arranged between the machine table and the base, and the movable platform is in sliding sleeve connection with the guide rods.
The rack is connected with the machine table through a guide rod support, the test rod is arranged at the central axis of the rack and is in threaded connection with the machine table, and the base is arranged corresponding to the test rod. The four corners of the mobile platform are sleeved on the guide rods, the test rods are connected with the middle of the mobile platform, and the rotation of the connection part of the mobile platform is kept unaffected through the supporting piece. When the driving motor is started, the testing rod is screwed into the machine table, the moving platform is pushed to move downwards along the guide rod, and the pressing head is driven to approach to the battery to be tested, which is arranged at the top of the base; and after the test is finished, controlling the driving motor to rotate reversely, so that the test rod rotates away from the base.
Preferably, the pressing test mechanism further comprises a vibration motor, the vibration motor is arranged at the bottom end of the test rod, and the pressing head is arranged on the vibration motor.
Further, the press fit testing mechanism further comprises a touch panel, the control unit is arranged in the touch panel, and the touch panel controls the driving motor and the vibration motor through the control unit.
Further, a thickness sensor is arranged on the base, and the thickness sensor surrounds the battery to be detected which is arranged on the base.
When the pressing head is attached to the upper surface of the battery to be tested and is ready for hardness test, the touch panel is used for controlling the vibration motor to drive the pressing head to vibrate at high frequency, the soft package battery is enabled to shake by taking the test point as a vibration center through continuous high-frequency vibration, the edge of the soft package battery starts to vibrate up and down, and at the moment, the thickness sensor arranged around the periphery of the soft package battery can perform edge amplitude test on the soft package battery; the thickness sensor is connected with the control unit, and can compare and record the amplitude difference value of each point at the outer edge of the soft package battery, so that the uniformity degree of the soft package battery is tested, and the product control unit exceeding the rated amplitude difference value alarms and reminds operators to reject.
Preferably, the mobile platform is further provided with a displacement sensor, and a signal output end of the displacement sensor is connected to a signal input end of the control unit. The displacement sensor is used for testing and recording the downward detection distance of the mobile platform, and the control unit is used for controlling the downward pressure of the pressing head, so that the displacement sensor can measure the displacement of the pressing head under the rated pressure and characterize the hardness of the soft-package battery through the displacement.
Preferably, scale marks are arranged on the base. The scale marks are used for accurately controlling the placement points of the battery to be tested. Because the hardness testing device disclosed by the invention is used for carrying out local hardness test on the soft-package battery, the placement points of the soft-package battery are determined with the assistance of the scale marks, so that the test points are aligned with the pressing head during each test; meanwhile, when vibration uniformity test is performed, the pressing head can be ensured to be aligned to the center of the soft package battery.
The invention also discloses a method for testing the hardness of the soft-packaged battery by using the soft-packaged battery hardness testing device, which comprises the following steps:
s1: placing a battery to be tested on a base, and aligning the part to be tested of the battery to be tested with a pressing head;
s2: starting a pressing test mechanism, driving a motor to drive a test rod to move, enabling a movable platform arranged at the end part of the test rod to slide along a rack, enabling a pressing head at the end part of the test rod to move towards a base, enabling the pressing head to be attached to a to-be-tested point on the upper surface of a battery to be tested, and preparing for hardness test, wherein the hardness test comprises a whole hardness test mode and a local point hardness test mode;
s3: firstly, setting the pressure of a pressing head for a local point hardness test mode in the step S2, starting a vibration motor through a touch panel, controlling the pressing head to perform point contact vibration test on a battery to be tested, and quantitatively analyzing the pressing deformation of the battery;
s4: selecting a plurality of test points on the battery to be tested, performing the hardness test in the step S3, and performing quantitative analysis on deformation of each test point on the battery to be tested to complete the hardness test of local points;
s5: and S2, starting the overall hardness test, abutting the pressing head against the battery to be tested, controlling the downward moving speed of the movable platform by the control unit according to a preset value, setting the maximum pressure value of the pressing head, stopping and maintaining the movable platform for a rated position time when the pressing head reaches the maximum pressure, then moving upwards to withdraw the battery to be tested, and characterizing the overall hardness of the battery to be tested according to the deformation amount of the test point.
The hardness testing device of the soft package battery is divided into three testing modes: 1. testing the overall hardness of the battery to be tested; 2. testing the local hardness of a test point of a battery to be tested; 3. testing the overall uniformity of the battery to be tested; in the first mode, the pressing head is abutted against a test point of a battery to be tested under the drive of the driving motor, the pressing head is controlled by the control unit, so that rated pressure pressing is carried out on the soft package battery by the pressing head, the test point of the soft package battery after pressing is sunken, and the whole hardness of the battery to be tested can be obtained by testing the downward detection distance of the moving platform through the displacement sensor; in the second mode, after the lamination head is attached to the test point of the battery to be tested, the vibration motor is started, the lamination head performs high-frequency impact on the test point, and as the lamination head performs high-speed vibration on the test point of the soft package battery, the impact force is represented by the rated vibration frequency, and the test point can be subjected to local hardness test; in the third mode, the pressing head is abutted against the center point of the battery to be tested, the vibration motor is started to start high-frequency impact, the thickness sensor arranged on the periphery of the base is used for recording the amplitude of the periphery of the soft package battery, and the uniformity of the battery to be tested is judged by comparing the amplitude difference values of all points on the periphery.
Therefore, the invention has the following beneficial effects: (1) Performing lamination test on the battery to be tested by using a lamination test mechanism, locally extruding the surface of the soft-packaged battery by using a lamination head with preset pressure, analyzing the plastic deformation state of the surface of the battery, and quantitatively characterizing the hardness of the soft-packaged battery; (2) The touch panel is used for controlling the vibration motor to drive the pressing head to vibrate at high frequency, the edge of the soft package battery starts to vibrate up and down, and the thickness sensor which is annularly arranged on the periphery of the soft package battery can test the edge amplitude of the soft package battery and record the amplitude difference value of each point on the periphery of the soft package battery, so that the uniformity degree of the soft package battery is tested; (3) The placement points of the soft package battery are determined in an auxiliary mode through the scale marks, and the test points are aligned with the pressing heads during each test; meanwhile, when vibration uniformity test is performed, the lamination head can be ensured to be aligned to the center of the soft package battery; (4) After the lamination head is attached to the test point of the battery to be tested, the vibration motor is started, the lamination head performs high-frequency impact on the test point, and as the lamination head performs high-speed vibration on the test point of the soft package battery, the impact force is represented by the rated vibration frequency, and the test point can be subjected to local hardness test; (5) The hardness testing device with compact structure can save the occupied area of equipment and reduce the cost.
Drawings
Fig. 1 is a schematic view of a structure of the present invention.
In the figure: 1. the device comprises a base, 2, a frame, 21, a machine table, 22, a test rod, 23, a driving motor, 24, a guide rod, 25, a supporting piece, 3, a moving platform, 4, a pressing head, 41, a force sensor, 5, a vibrating motor, 6, a touch panel, 7, a thickness sensor, 8 and a battery to be tested.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
In the embodiment shown in fig. 1, the hardness testing device for the soft package battery of the invention comprises a base 1, wherein a frame 2 is arranged on the base 1, a mobile platform 3 and a pressing testing mechanism are arranged on the frame 2, the pressing testing mechanism comprises a control unit, the pressing testing mechanism comprises a pressing head 4 which is arranged corresponding to the base 1, a force sensor 41 is arranged on the pressing head 4, and a signal output end of the force sensor 41 is connected with a signal input end of the control unit. The control unit of the soft-packaged battery hardness testing device collects signals of the force sensor 41 and controls the pressure of the pressing head 4 through the driving motor 23, so that the pressure value in the hardness testing process is controlled in a variable mode, the soft-packaged battery to be tested is subjected to local hardness testing according to the rated pressure value, and quantitative hardness detection of the soft-packaged battery is achieved through analysis of the deformation degree of the surface of the battery. The control unit in this embodiment is a single chip microcomputer, the force sensor 41 is a load cell, the pressure range of the load cell is 0-100N, and the precision is 0.3%. The pressing head 4 in this embodiment is a cylinder made of polytetrafluoroethylene.
The top of the frame 2 is provided with an organic table 21, the machine table 21 is provided with a test rod 22 in a penetrating manner, the pressing head 4 is arranged at the bottom of the test rod 22, the machine table 21 is provided with a driving motor 23, a transmission part is arranged between the driving motor 23 and the top of the test rod 22, and the transmission part adopts a coupler in the embodiment. Further, the test rod 22 is in threaded connection with the machine table 21, the mobile platform 3 is movably sleeved on the frame 2, the mobile platform 3 is connected with the test rod 22, and a supporting piece 25 is arranged between the test rod 22 and the mobile platform 3. Further, the frame 2 includes a plurality of guide rods 24 disposed between the machine 21 and the base 1, and the moving platform 3 is slidably sleeved on the guide rods 24.
The machine frame 2 is connected with the machine table 21 through a guide rod 24 in a supporting mode, the test rod 22 is arranged at the position of the central axis of the machine frame 2 and is in threaded connection with the machine table 21, and the base 1 is arranged corresponding to the test rod 22. The four corners of the moving platform 3 are sleeved on the guide rods 24, the test rod 22 is connected with the middle part of the moving platform 3, and the rotation of the connecting part of the moving platform is kept unaffected by the support piece, in the embodiment, the support piece 25 adopts a roller bearing. When the driving motor 23 is started, the testing rod 22 is screwed into the machine table 21, so that the movable platform 3 is pushed to move downwards along the guide rod 24, and the pressing head 4 is driven to approach the battery 8 to be tested which is arranged at the top of the base 1; after the test is finished, the driving motor 23 is controlled to rotate reversely, so that the test rod 22 rotates away from the base 1. In this embodiment, the driving motor 23 is a servo motor, the testing rod 22 is a screw rod, the control unit controls the pressing down speed of the pressing head 4 by controlling the rotation speed of the servo motor, and determines the contact test point and the contact pressure between the pressing head 4 and the surface of the battery 8 to be tested through the feedback signal of the force sensor 41, collects the output signal of the servo motor encoder to determine the rotation number of the servo motor, calculates the pressing depth of the pressing head 4 after the pressing head is contacted with the battery to be tested according to the screw rod parameters, and can record the force-displacement curve and the force-time change curve of the pressing head 4.
The pressing test mechanism further comprises a vibrating motor 5, the vibrating motor 5 is arranged at the bottom end of the test rod 22, and the pressing head 4 is arranged on the vibrating motor 5. Further, the press-fit testing mechanism further comprises a touch panel 6, the control unit is arranged in the touch panel 6, and the touch panel 6 controls the driving motor 23 and the vibration motor 5 through the control unit. Further, a thickness sensor 7 is disposed on the base 1, and the thickness sensor surrounds a battery to be detected disposed on the base 1.
When the pressing head 4 is attached to the upper surface of the battery 8 to be tested and is ready for hardness test, the touch panel 6 controls the vibration motor 5 to drive the pressing head 4 to vibrate at high frequency, the soft package battery shakes around the test point as a vibration center due to continuous high frequency vibration, the edge of the soft package battery starts to vibrate up and down, and at the moment, the thickness sensor 7 which is annularly arranged on the periphery of the soft package battery can test the edge amplitude of the soft package battery; the thickness sensor 7 is connected with the control unit, and can compare and record the amplitude difference value of each point at the outer edge of the soft package battery, so that the uniformity degree of the soft package battery is tested, and the product control unit exceeding the rated amplitude difference value alarms and reminds operators to reject.
The mobile platform 3 is also provided with a displacement sensor, and the signal output end of the displacement sensor is connected with the signal input end of the control unit. The displacement sensor is used for testing and recording the downward detection distance of the movable platform 3, and the control unit is used for controlling the downward pressure of the pressing head 4, so that the displacement sensor can measure the displacement of the pressing head 4 under the rated pressure and characterize the hardness of the soft package battery through the displacement. The displacement sensor in this embodiment has a precision of 0.01mm and a resolution of 0.001mm.
Scale marks are arranged on the base 1. The scale marks are millimeter-scale ranges and are used for accurately controlling the placement points of the battery 8 to be tested. Because the hardness testing device disclosed by the invention is used for carrying out local hardness test on the soft-package battery, the placement points of the soft-package battery are determined by utilizing the assistance of the scale marks, so that the test points are aligned with the pressing head 4 during each test; at the same time, the alignment of the lamination head 4 to the center of the soft pack battery can be ensured when the vibration uniformity test is performed. In this embodiment, the flatness of the upper surface of the base 1 is 000, so that various influencing conditions affecting the accuracy of the test are eliminated as much as possible during the hardness test and the uniformity test.
The invention also discloses a method for testing the hardness of the soft-packaged battery by using the soft-packaged battery hardness testing device, which comprises the following steps:
s1: placing the battery 8 to be tested on the base 1, and aligning the part to be tested of the battery 8 to be tested with the pressing head 4;
S2: starting a pressing test mechanism, driving a test rod 22 to move by a driving motor 23, sliding a moving platform 3 arranged at the end part of the test rod 22 along a rack 2, moving a pressing head 4 at the end part of the test rod 22 to a base 1, attaching the pressing head 4 to a point to be tested on the upper surface of a battery 8 to be tested, and preparing for hardness test, wherein the hardness test comprises a whole hardness test mode and a local point hardness test mode;
S3: firstly, setting the pressure of a pressing head 4 for a local point hardness test mode in the step S2, starting a vibration motor 5 through a touch panel 6, controlling the pressing head 4 to perform point contact vibration test on a battery 8 to be tested, and quantitatively analyzing the pressing deformation of the battery;
S4: selecting a plurality of test points on the battery 8 to be tested, performing the hardness test in the step S3, and performing quantitative analysis on deformation of each test point on the battery 8 to be tested to complete the hardness test of local points;
S5: and S2, starting the overall hardness test, wherein the pressing head 4 is abutted against the battery 8 to be tested, the control unit controls the downward moving speed of the moving platform 3 according to a preset value, sets the maximum pressure value of the pressing head 4, stops and maintains the position of the moving platform 3 for a rated time when the pressing head 4 reaches the maximum pressure, then moves upwards to withdraw the battery 8 to be tested, and characterizes the overall hardness of the battery 8 to be tested according to the deformation amount of the test point.
The hardness testing device of the soft package battery is divided into three testing modes: 1. testing the overall hardness of the battery 8 to be tested; 2. testing the local hardness of the test point of the battery 8 to be tested; 3. testing the overall uniformity of the battery 8 to be tested;
In the first mode, the pressing head 4 is abutted against a test point of the battery 8 to be tested under the drive of the driving motor 23, and is controlled by the control unit, so that the pressing head 4 performs rated pressure pressing on the soft package battery, the test point of the soft package battery after pressing is sunken, and the whole hardness of the battery 8 to be tested can be obtained by testing the downward detection distance of the mobile platform 3 through the displacement sensor; in this mode, the pressing speed of the pressing head 4 is set to be 5mm/S, the maximum pressure of the pressing head 4 is set to be 10N, pressing is stopped when the pressure reaches the set maximum value, the soft package battery is removed after the pressing state is maintained for 10S, and an operator measures deformation of the test point to determine the hardness of the soft package battery. It is worth noting that, still be provided with pressure sensor on the base, though pressfitting head maximum pressure sets up to 10N, in case when pressure overload appears, the soft packet of battery does not have the shell protection and appears the condition that the excessive pressure damaged easily, consequently the pressure sensor that sets up on the base can carry out overload protection to the battery of treating the detection, avoids the battery to appear damaging.
Example 2
In the second mode, after the lamination head 4 is attached to the test point of the battery 8 to be tested, the vibration motor 5 is started, the lamination head 4 performs high-frequency impact on the test point, and as the lamination head 4 performs high-speed vibration on the test point of the soft package battery, the impact force is represented by the rated vibration frequency, and the test point can be subjected to local hardness test; in the mode, the vibration motor 5 adopts a miniature vibration motor, the vibration frequency is 50Hz, the vibration duration is 20S, the mode can effectively test the local point hardness of the soft package battery, especially the hardness test of the corner of the battery, the transmission lamination test leads to poor accuracy of the test result due to the non-uniform battery area around the corner of the battery, the test effect is not ideal, and the high-frequency vibration test method can avoid the defect of the lamination type hardness test and accurately test the local point hardness of the soft package battery. In this embodiment, a five-point test method is adopted to test the local hardness of the four corners and the center of the soft battery.
Example 3
In the third mode, the pressing head 4 is abutted against the center point of the battery 8 to be tested, the vibration motor 5 is started to start high-frequency impact, the thickness sensor 7 arranged on the periphery of the base 1 records the amplitude of the periphery of the soft package battery, and the uniformity of the battery 8 to be tested is judged by comparing the amplitude difference values of all points on the periphery. In this mode, the vibration frequency is 50Hz and the vibration time is longer than 30S. In this embodiment, the thickness sensor 7 is a commercially available laser sensor, and uses a laser beam as a mechanical probe during contact measurement, and the thickness sensor 7 disposed at the periphery of the base 1 during vibration can accurately record the amplitude of the edge of the soft package battery, and the soft package battery is a nylon layer. The adhesive layer, the aluminum foil layer and other substance layers are wrapped and formed, so that the phenomenon of uneven uniformity (sealing) is easy to occur, the influence of the vibration center on the edge of the part with higher density of the soft package battery is smaller, and the amplitude is lower; correspondingly, the amplitude of the edge of the part with lower sealing is higher, the measured signal is input into the control unit by the thickness sensor, the control unit calculates the amplitude difference value of each point of the edge of the battery, and if the amplitude difference value of the maximum amplitude and the minimum amplitude of the edge detection point of the soft package battery exceeds the preset value in the control unit, the control unit outputs an alarm signal and feeds back the alarm signal to an operator by the touch panel 6, so that the uniformity of the product is reminded to be in a bad state. It is worth noting that, the thickness sensor 7 and the base 1 are arranged in a separated structure, so that the thickness sensor 7 can be effectively prevented from being affected by resonance of the vibration motor 5, and accuracy of amplitude difference measurement is further improved.
In addition to the above embodiments, the technical features of the present invention may be rearranged and combined within the scope of the claims and the disclosure of the present invention to form new embodiments, which may be realized by those skilled in the art without inventive effort, and thus, embodiments of the present invention not described in detail should be considered as embodiments of the present invention within the scope of the protection of the present invention.
Claims (9)
1. The utility model provides a soft packet of battery hardness testing arrangement, includes base (1), characterized by, be provided with frame (2) on base (1), be provided with moving platform (3) and pressfitting testing mechanism on frame (2), pressfitting testing mechanism is including the control unit, pressfitting testing mechanism is including pressfitting head (4) that correspond base (1) setting, be provided with force sensor (41) on pressfitting head (4), the signal output part of force sensor (41) is connected in the signal input part of control unit;
The machine comprises a frame (2), and is characterized in that an organic table (21) is arranged at the top end of the frame (2), a test rod (22) is arranged on the machine table (21) in a penetrating manner, a pressing head (4) is arranged at the bottom end of the test rod (22), and a driving motor (23) is arranged on the machine table (21);
the pressing test mechanism further comprises a vibrating motor (5), the vibrating motor (5) is arranged at the bottom end of the test rod (22), and the pressing head (4) is arranged on the vibrating motor (5);
After the pressing head (4) is attached to the test point of the battery to be tested, the vibration motor (5) is started, the pressing head (4) performs high-frequency impact on the test point, and as the pressing head (4) performs high-speed vibration on the test point, the impact force is represented by the rated vibration frequency, and the test point can be subjected to local hardness test;
the hardness testing device of the soft package battery is divided into three testing modes: testing the overall hardness of the battery to be tested; testing the local hardness of a test point of a battery to be tested; testing the overall uniformity of the battery to be tested;
In the first mode, the pressing head (4) is abutted against a test point of the battery (8) to be tested under the drive of the driving motor (23), the pressing head (4) is controlled by the control unit to press the soft package battery under rated pressure, the test point of the soft package battery after pressing is sunken, and the whole hardness of the battery (8) to be tested can be obtained by testing the downward detection distance of the mobile platform (3) through the displacement sensor;
in the second mode, after the pressing head (4) is attached to the test point of the battery (8) to be tested, the vibration motor (5) is started, the pressing head (4) performs high-frequency impact on the test point, and as the pressing head (4) performs high-speed vibration on the test point of the soft package battery, the impact force is represented by the rated vibration frequency, and the test point can be subjected to local hardness test;
In the third mode, the pressing head (4) is abutted against the center point of the battery (8) to be tested, the vibration motor (5) is started to start high-frequency impact, the thickness sensor (7) arranged on the periphery of the base (1) records the amplitude of the periphery of the soft package battery, and the uniformity of the battery (8) to be tested is judged by comparing the amplitude difference values of all points on the periphery.
2. The device for testing the hardness of the soft-packaged battery according to claim 1, wherein a transmission member is arranged between the driving motor (23) and the top end of the testing rod (22).
3. The device for testing the hardness of the soft-packaged battery according to claim 2, wherein the test rod (22) is in threaded connection with the machine table (21), the movable platform (3) is movably sleeved on the machine frame (2), the movable platform (3) is connected with the test rod (22), and a supporting piece is arranged between the test rod and the movable platform.
4. A soft package battery hardness testing device according to claim 3, characterized in that the frame (2) comprises a plurality of guide rods (24) arranged between the machine table (21) and the base (1), and the movable platform (3) is in sliding sleeve connection with the guide rods (24).
5. The soft package battery hardness testing device according to claim 1, wherein the press fit testing mechanism further comprises a touch panel (6), the control unit is arranged in the touch panel (6), and the touch panel (6) controls the driving motor (23) and the vibration motor (5) through the control unit.
6. The device for testing the hardness of the soft-packaged battery according to claim 1, wherein a displacement sensor is further arranged on the mobile platform (3), and a signal output end of the displacement sensor is connected with a signal input end of the control unit.
7. The soft package battery hardness testing device according to claim 1, wherein a thickness sensor (7) is arranged on the base (1), and the thickness sensor surrounds a battery to be detected arranged on the base (1).
8. The hardness testing device for the soft-packaged battery according to claim 1, wherein graduation marks are arranged on the base (1).
9. A testing method of a soft pack battery hardness testing device according to any one of claims 1 to 8, comprising the steps of:
s1: placing the battery to be tested on the base (1), and aligning the part to be tested of the battery to be tested with the pressing head (4);
s2: starting a pressing test mechanism, driving a test rod (22) to move by a driving motor (23), sliding a moving platform (3) arranged at the end part of the test rod (22) along a rack (2), moving a pressing head (4) at the end part of the test rod (22) towards a base (1), and attaching the pressing head (4) to a to-be-tested point on the upper surface of a battery to be tested to prepare for hardness test, wherein the hardness test comprises an integral hardness test mode and a local point hardness test mode;
s3: firstly, setting the pressure of a pressing head (4) for a local point hardness test mode in the step S2, starting a vibration motor (5) through a touch panel (6), controlling the pressing head (4) to perform point contact vibration test on a battery to be tested, and quantitatively analyzing the pressing deformation of the battery;
s4: selecting a plurality of test points on the battery to be tested, performing the hardness test in the step S3, and performing quantitative analysis on deformation of each test point on the battery to be tested to complete the hardness test of local points;
S5: and S2, starting the overall hardness test, wherein the pressing head (4) abuts against the battery to be tested, the control unit controls the downward moving speed of the movable platform (3) according to a preset value, sets the maximum pressure value of the pressing head (4), stops and maintains the position for a rated time when the pressing head (4) reaches the maximum pressure, then moves upwards to withdraw from the battery to be tested, and characterizes the overall hardness of the battery to be tested according to the deformation amount of the test point.
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| CN113125277A (en) * | 2021-03-24 | 2021-07-16 | 万向一二三股份公司 | Soft package lithium ion battery bending deformation testing equipment and testing method thereof |
| CN113218798A (en) * | 2021-03-24 | 2021-08-06 | 万向一二三股份公司 | Device for measuring hardness of soft package battery |
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| CN113588418A (en) * | 2021-07-08 | 2021-11-02 | 一汽奔腾轿车有限公司 | Device and method for measuring surface rigidity of automobile body covering part |
| CN113504142B (en) * | 2021-08-13 | 2022-11-01 | 无锡恩捷新材料科技有限公司 | Shore hardness testing device and testing method |
| CN114563292B (en) * | 2022-03-28 | 2024-06-07 | 洛阳轴承集团股份有限公司 | Test method for accurately measuring hardness of micron-sized coating layer |
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