CN117723007A - Detection system and detection method for cylindrical battery cell closing gap - Google Patents
Detection system and detection method for cylindrical battery cell closing gap Download PDFInfo
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- CN117723007A CN117723007A CN202410178317.8A CN202410178317A CN117723007A CN 117723007 A CN117723007 A CN 117723007A CN 202410178317 A CN202410178317 A CN 202410178317A CN 117723007 A CN117723007 A CN 117723007A
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- cylindrical battery
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- cover closing
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Mounting, Suspending (AREA)
Abstract
The embodiment of the application provides a detection system and a detection method for a cylindrical battery cell cover gap. The support cup sets up in the clearance detection station, holds in the palm the cup and is provided with the holding tank that is used for holding the cylinder electricity core and runs through the via hole of holding tank diapire. The detection mechanism is arranged at the gap detection station and is used for detecting the cover closing gap of the side face of the cylindrical battery cell. The rotary jacking mechanism is arranged below the supporting cup and used for jacking the cylindrical battery cell positioned in the accommodating groove. The pushing mechanism is arranged above the supporting cup and used for pushing down the cylindrical battery cell so that the pushing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction, and the rotary jacking mechanism can drive the cylindrical battery cell to rotate. The pressing mechanism comprises a third driving piece and a pressing part, and the detection system further comprises an encoder arranged on the pressing part. The reliability of the closing gap detection can be improved.
Description
Technical Field
The application relates to the technical field of battery production, in particular to a detection system and a detection method for a cylindrical battery cell cover gap.
Background
This section is intended to provide a background or context for embodiments of the present application. The description herein is not admitted to be prior art by inclusion in this section.
New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like.
In the production process of the battery cell, after the bare cell is placed in the cylindrical shell and the cell rear cover is closed, the cylindrical cell with the shell can be obtained. After the bare cell is put into the shell, shell cover welding is needed to weld the cylindrical shell and the rear cell cover together. In order to ensure the quality of the welding of the shell cover, the cover closing gap between the battery cell rear cover and the cylindrical shell can be detected after the battery cell rear cover and the cylindrical shell are closed and before the shell cover is welded, so that the cover closing gap of the cylindrical battery cell is ensured to be within the process range.
However, in the related art, the detection reliability is not high due to the scheme of detecting the closing gap of the cylindrical battery cell, and damage such as abrasion or scratch may occur on the surface of the cylindrical battery cell, which affects the product quality.
Disclosure of Invention
In view of this, the embodiment of the application expects to provide a detection system and a detection method for a cylindrical battery cell cover gap, which can improve the reliability of detecting the cylindrical battery cell cover gap, reduce the damage to the surface of the cylindrical battery cell, and improve the product quality.
To achieve the above object, a first aspect of the embodiments of the present application provides a detection system for a cover closing gap of a cylindrical battery cell, including:
one or more gap detection stations;
the support cup is arranged at the gap detection station and is provided with a containing groove for containing the cylindrical battery cell and a through hole penetrating through the bottom wall of the containing groove;
the detection mechanism is arranged at the gap detection station and is used for detecting the cover closing gap of the side face of the cylindrical battery cell;
the rotary jacking mechanism is arranged below the supporting cup and is used for jacking the cylindrical battery cell positioned in the accommodating groove;
the pressing mechanism is arranged above the supporting cup and is used for pressing down the cylindrical battery cell, so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction, and the rotary jacking mechanism can drive the cylindrical battery cell to rotate.
In the detection system of the cylindrical battery cell cover closing gap, on one hand, the rotary jacking mechanism rotates through driving the cylindrical battery cell, and in the process that the cylindrical battery cell rotates relative to the detection mechanism, the detection mechanism detects the cover closing gap of the side face of the cylindrical battery cell, so that the detection mechanism can detect the cover closing gaps of different areas of the side face of the cylindrical battery cell, and the reliability of the cover closing gap detection is improved. On the other hand, before the rotary jacking mechanism drives the cylindrical battery cell to rotate, the pressing mechanism can press the cylindrical battery cell, and the pressing mechanism and the rotary jacking mechanism can be clamped at two ends of the cylindrical battery cell along the height direction, so that the cylindrical battery cell is in a clamped state along the height direction in the rotating process, the jumping and slipping problems of the cylindrical battery cell are reduced, the reliability of cover closing gap detection is further improved, and the battery cell scratch problem is reduced. In still another aspect, before the pressing mechanism presses down the cylindrical battery cell, the rotary jacking mechanism can jack the cylindrical battery cell positioned in the supporting cup by a first preset distance, so that the bottom of the cylindrical battery cell is separated from the bottom wall of the supporting cup, the pressure of the bottom wall of the cylindrical supporting cup on the cylindrical battery cell can be reduced, the damage to the bottom of the cylindrical battery cell is reduced, and abrasion and scratch caused by relative movement between the subsequent cylindrical battery cell and the supporting cup in the rotation process can be reduced.
In some embodiments, the rotary jacking mechanism comprises an elastic reset piece and a jacking piece, wherein the jacking piece is used for being abutted to the cylindrical battery cell, and the elastic reset piece is matched with the jacking piece, so that the jacking piece can stretch and retract along the height direction of the cylindrical battery cell under the action of elastic force.
Here, through setting up elasticity and reset the piece and the cooperation of jacking piece, on the one hand, can make the jacking piece flexible along the direction of height of cylinder electricity core under the elasticity effect of elasticity reset piece, so, can be applicable to not high dimensional cylinder electricity core, improve detecting system's suitability. On the other hand, the rotary jacking mechanism can be clamped at the end part of the cylindrical battery cell along the height direction under the action of the elastic force, in other words, the rotary jacking mechanism is not in hard contact with the cylindrical battery cell, and damage to the bottom of the cylindrical battery cell is further reduced.
In some embodiments, the rotary jacking mechanism further comprises a first driving member, a second driving member and a connecting portion, wherein the connecting portion is slidably connected with the jacking member along the height direction of the cylindrical battery cell, and the elastic reset member is arranged between the connecting portion and the jacking member;
The first driving piece drives the connecting part to rotate and drives the jacking piece to rotate; the second driving piece drives the connecting part to move along the height direction of the cylindrical battery cell and drives the jacking piece to jack the cylindrical battery cell.
The rotary jacking mechanism is characterized in that the first driving part, the second driving part and the connecting part are arranged, the elastic resetting part is arranged between the connecting part and the jacking part, the first driving part rotates through the driving connecting part so as to drive the jacking part to rotate, the second driving part drives the jacking part to jack the cylindrical battery cell through the driving connecting part, and therefore the rotary jacking mechanism can rotate and jack the cylindrical battery cell, and the rotary jacking mechanism is simple and compact in structure.
In some embodiments, the jacking piece comprises a jacking part, a first rotating shaft connected with the jacking part and a first stop piece protruding along the circumferential direction of the first rotating shaft, the connecting part comprises a connecting shaft connected with the first driving piece, a second rotating shaft connected with the connecting shaft and a second stop piece protruding along the circumferential direction of the second rotating shaft, and the elastic reset piece is arranged between the first stop piece and the second stop piece;
The first rotating shaft is sleeved on the second rotating shaft, or the second rotating shaft is sleeved on the first rotating shaft; one of the first rotating shaft and the second rotating shaft is provided with a sliding groove extending along the height direction of the cylindrical battery cell, the other one of the first rotating shaft and the second rotating shaft is provided with a sliding column in sliding fit with the sliding groove, and the connecting part can drive the jacking piece to rotate through the sliding column and the sliding groove in matching.
The rotary jacking mechanism of the embodiment of the application is respectively abutted to the two ends of the elastic reset piece through the first stop piece and the second stop piece, so that the rotary jacking mechanism is suitable for cylindrical battery cells of different types. The first rotating shaft is sleeved on the second rotating shaft to improve the connection stability between the jacking piece and the connecting part, the sliding groove is formed in the second rotating shaft, the sliding column is arranged on the first rotating shaft and slides in the sliding groove to realize the expansion and contraction between the jacking piece and the connecting part, and the connecting part drives the jacking piece to rotate through the matching of the groove wall of the sliding groove and the sliding column.
In some embodiments, the junction of the bottom wall and the side wall of the accommodating groove is recessed to form a groove.
The recess is formed at the juncture of the bottom wall and the side wall of the accommodating groove, so that the battery cell can be accommodated with dust and other impurities, and the situation that the battery cell is polluted by dust and other impurities accumulated at the bottom of the supporting cup or the battery cell is blocked in the supporting cup is improved.
In some embodiments, the pressing mechanism includes a third driving member and a pressing portion, the detecting system further includes an encoder disposed on the pressing portion, the third driving member is configured to drive the pressing portion to press the cylindrical battery cell, the cylindrical battery cell rotates to drive the pressing portion and the encoder to rotate, and rotation axes of the cylindrical battery cell, the pressing portion and the encoder are the same;
the encoder outputs detection trigger signals to the detection mechanism at preset rotation angles at intervals in the process of following the rotation of the cylindrical battery cell, so as to control the detection mechanism to detect the cover closing gap of the cylindrical battery cell.
In the above embodiment, since the encoder on the pressing portion is rotated by the cylindrical battery cell through rotation, and the encoder is the same as the rotation axis of the cylindrical battery cell, the rotation angle of the cylindrical battery cell can be sensed by the encoder, so that the encoder outputs the detection trigger signal to the detection mechanism at intervals preset in the process of following the rotation of the cylindrical battery cell, and the detection mechanism can be simply and accurately controlled to detect the cover closing gaps of a plurality of areas on the side surface of the cylindrical battery cell.
In some embodiments, the detection system further comprises a rotatable turntable, the backing cup is disposed on the turntable, and the detection mechanism is disposed outside of the turntable.
In the above-mentioned embodiment, through putting into the cylinder electric core and hold in the palm the cup to rotate through the carousel and hold in the palm the removal of cup realization electric core, on the one hand can transport the cylinder electric core to the clearance detection station steadily, on the other hand holds in the palm the cup and can play the righting effect to the cylinder electric core, is convenient for keep the cylinder electric core coaxial with the rotation axis of rotatory climbing mechanism, thereby can improve the stationarity of cylinder electric core rotation process, improves the reliability that closes the lid clearance and detects, and reduces electric core fish tail problem.
The second aspect of the embodiments of the present application provides a detection method for a cover closing gap of a cylindrical battery cell, which is applied to a detection system for the cover closing gap of the cylindrical battery cell, where the detection system includes a control device, a support cup, a detection mechanism, a rotary jacking mechanism and a pressing mechanism, and the detection method includes:
the control equipment controls the rotary jacking mechanism to jack the cylindrical battery cell positioned in the support cup by a first preset distance so as to enable the bottom of the cylindrical battery cell to be separated from the bottom wall of the support cup;
The control equipment controls the pressing mechanism to press the cylindrical battery cell so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction;
the control equipment controls the rotary jacking mechanism to jack the cylindrical battery cell to a detection position;
the control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, and controls the detection mechanism to detect a cover closing gap of the side face of the cylindrical battery cell in the process that the cylindrical battery cell rotates relative to the detection mechanism.
In the detection method for the cover closing gap of the cylindrical battery cell, on one hand, the control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, and controls the detection mechanism to detect the cover closing gap of the side face of the cylindrical battery cell in the process that the cylindrical battery cell rotates relative to the detection mechanism, so that the detection mechanism can detect the cover closing gaps of different areas of the side face of the cylindrical battery cell, and the reliability of the cover closing gap detection is improved; on the other hand, before the rotary jacking mechanism drives the cylindrical battery cell to rotate, the cylindrical battery cell is pressed down by controlling the pressing mechanism, so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction, the cylindrical battery cell can be in a clamped state along the height direction in the rotating process, the jumping and slipping problems of the cylindrical battery cell are reduced, the reliability of detecting a closing gap is further improved, and the scratch problem of the battery cell is reduced; in still another aspect, before the pressing mechanism presses down the cylindrical battery cell, the rotary jacking mechanism is controlled to jack up the cylindrical battery cell positioned in the supporting cup by a first preset distance so that the bottom of the cylindrical battery cell is separated from the bottom wall of the supporting cup, thus, the pressure of the bottom wall of the cylindrical supporting cup on the cylindrical battery cell can be reduced, the damage to the bottom of the cylindrical battery cell is reduced, and the abrasion and scratch caused by the relative motion between the subsequent cylindrical battery cell and the supporting cup in the rotation process can be reduced.
In some embodiments, the hold-down mechanism includes a third drive member and a hold-down portion, the detection system further including an encoder disposed on the hold-down portion; the control equipment controls the pressing mechanism presses down the cylindrical battery cell, so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction, and the control equipment comprises: the control equipment controls the third driving piece to drive the pressing part to press the cylindrical battery cell downwards, so that the pressing part and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction; the control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, and in the process that the cylindrical battery cell rotates relative to the detection mechanism, the control mechanism detects the cover closing gap of the side face of the cylindrical battery cell, and the control equipment comprises: the control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, the cylindrical battery cell drives the pressing part and the encoder to rotate through rotation, and the rotation shafts of the cylindrical battery cell, the pressing part and the encoder are the same; the encoder outputs detection trigger signals to the detection mechanism at preset rotation angles at intervals in the process of following the rotation of the cylindrical battery cell, so as to control the detection mechanism to detect the cover closing gap of the cylindrical battery cell.
Like this, because the encoder on the portion of pushing down is driven rotatory through rotating by the cylinder electricity core, and this encoder is the same with the axis of rotation of cylinder electricity core, like this, can respond to the rotation angle of cylinder electricity core through the encoder to preset rotation angle to detection mechanism output detection trigger signal at every interval in the in-process of following cylinder electricity core pivoted through the encoder, can simply control detection mechanism and detect the closing gap of a plurality of regions of cylinder electricity core side accurately.
In some embodiments, the detection mechanism includes an image acquisition module and an image processing module; the encoder is followed the in-process of cylinder electricity core pivoted, every interval preset rotation angle to detection mechanism output detects trigger signal, in order to control detection mechanism detects the closing cap clearance of cylinder electricity core includes: the encoder outputs detection trigger signals to the image acquisition module at every interval of preset rotation angles in the process of following the rotation of the cylindrical battery cell so as to control the image acquisition module to acquire images of the side face of the cylindrical battery cell at intervals of the preset rotation angles, and a plurality of cover closing gap images of the cylindrical battery cell are obtained; and the image processing module detects the cover closing gap of the side face of the cylindrical battery cell based on the plurality of cover closing gap images to obtain a detection result.
Like this, through the encoder every interval predetermine rotation angle to image acquisition module output detection trigger signal, can control image acquisition module and use this predetermine rotation angle as the interval to the closing gap of cylinder electricity core side different regions carries out image acquisition, through image processing module based on the closing gap image of a plurality of regions of gathering, can detect the closing gap of cylinder electricity core's side more fast accurately.
In some embodiments, the image processing module detects a capping gap of a side surface of the cylindrical battery cell based on a plurality of capping gap images, to obtain a detection result, including: the image processing module detects the cover closing gap of the side face of the cylindrical battery cell according to each cover closing gap image to obtain a detection result corresponding to the cover closing gap image; and under the condition that the detection result corresponding to each cover closing gap image represents that the cover closing gap meets the preset process requirement, determining that the cover closing gap of the cylindrical battery cell is not abnormal.
Therefore, the cover closing gap detection can be carried out by utilizing each cover closing gap image respectively to obtain detection results corresponding to the cover closing gap images respectively, and the cover closing gap of the cylindrical battery cell is determined to be free of abnormality under the condition that the cover closing gap is met by the preset process requirement according to the detection results corresponding to the cover closing gap images respectively, so that the cover closing gap of the cylindrical battery cell is detected more comprehensively, the accuracy of the overall detection result of the cover closing gap is improved, and the produced battery cell product can meet the process requirement better.
In some embodiments, the detection system further comprises a rotatable turntable, the support cup is disposed on the turntable, and the detection mechanism is disposed outside the turntable; before the control device controls the rotary jacking mechanism to jack the cylindrical battery cell positioned in the supporting cup by a first preset distance, the detection method further comprises the following steps: the control equipment controls the turntable to rotate so as to convey the cylindrical battery cell to a gap detection station through the support cup and enable the cylindrical battery cell to be coaxial with a rotating shaft of the rotating jacking mechanism.
Like this, through putting into the cylinder electric core and hold in the palm the cup to rotate through the carousel and hold in the palm the removal of cup realization electric core, on the one hand can transport the cylinder electric core to the clearance detection station steadily, on the other hand holds in the palm the cup and can play the righting effect to the cylinder electric core, is convenient for keep the cylinder electric core coaxial with the rotation axis of rotatory climbing mechanism, thereby can improve the stationarity of cylinder electric core rotation process, improves the reliability that closes the clearance and detects, and reduces electric core fish tail problem.
Drawings
FIG. 1 is a schematic diagram of a detection system according to an embodiment of the present disclosure;
fig. 2 is a partial schematic view of a detection system provided in an embodiment of the present application at a gap detection station, where a rotary jacking mechanism is in a state before jacking a cylindrical battery cell;
Fig. 3 is a schematic partial view of a detection system provided in an embodiment of the present application at a gap detection station, where a rotary jacking mechanism is in a state after jacking a cylindrical battery cell;
FIG. 4 is an enlarged view of FIG. 3 at A;
FIG. 5 is a partial cross-sectional view of a rotary lift mechanism according to one embodiment of the present disclosure;
FIG. 6 is a cross-sectional view of a backing cup provided in an embodiment of the present application;
fig. 7 is a schematic implementation flow diagram of a method for detecting a cover closing gap of a cylindrical battery cell according to an embodiment of the present application;
fig. 8 is a second implementation flow chart of a method for detecting a cover closing gap of a cylindrical battery cell according to an embodiment of the present application;
fig. 9 is a schematic diagram of a communication flow between a PLC and a CCD vision detection system in a method for detecting a cover closing gap of a cylindrical battery cell according to an embodiment of the present application.
Description of the reference numerals
1. A gap detection station; 2. a support cup; 2a, a containing groove; 2b, via holes; 2c, grooves; 3. a detection mechanism; 4. a rotary jacking mechanism; 41. an elastic reset piece; 42. a jacking member; 421. a jacking portion; 422. a first rotating shaft; 422a, a spool; 423. a first stop; 43. a first driving member; 44. a connection part; 441. a connecting shaft; 442. a second rotating shaft; 442a, a chute; 443. a second stop; 5. a pressing mechanism; 51. a pressing part; 6. an encoder; 7. a turntable; 8. a capping station; 9. a welding station; 10. a detection system; 20. a cylindrical cell; 20a, closing the gap.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and technical features in the embodiments may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the gist of the present application and should not be construed as undue limitation to the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion.
In the description of the embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" generally indicates that the associated object is an "or" relationship.
In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc. are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured, operated, or used in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.
With the development of clean energy, more and more devices use electric energy as driving energy, and further, as a power battery capable of storing more electric energy and being charged and discharged repeatedly, for example, a lithium ion battery is rapidly developed. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.
In the embodiment of the application, the electric core may be a battery cell. The battery cell is a basic unit capable of realizing the mutual conversion of chemical energy and electric energy, and can be used for manufacturing a battery module or a battery pack so as to supply power to an electric device. The battery cell may be a primary battery or a secondary battery, and the secondary battery refers to a battery cell that can be continuously used by activating an active material in a charging manner after the battery cell is discharged. The battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, or a lead storage battery, etc., which is not limited in the embodiment of the present application. The battery cells may be cylindrical, rectangular, or other shapes, etc. It is understood that the cylindrical battery cell in the embodiments of the present application refers to a battery cell having a cylindrical shape.
The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be PP (Polypropylene) or PE (Polyethylene).
The battery cell also comprises a packaging film and a shell, wherein the packaging film is coated outside the electrode assembly, and the shell encapsulates the electrode assembly (namely the bare cell) coated with the packaging film to form the battery cell. For example, the packaging film may be a mylar film (mylar film), and the outer shell may be an aluminum or steel shell, or the like. After the electrode assembly is wound and formed, the Mylar coating process and the shell entering process are carried out to complete the encapsulation of the Mylar and the shell. The Mylar film has the functions of sealing and protecting the electrode assembly, and can effectively insulate the electrode assembly and the shell from each other, so that the internal short circuit of the battery cell is avoided. The shell plays a role in protection.
In the production process of the cylindrical battery cell, the bare battery cell is put into the cylindrical shell, and after the battery cell rear cover is closed, the cylindrical battery cell with the shell can be obtained. After the bare cell is put into the shell, shell cover welding is needed to weld the cylindrical shell and the rear cell cover together. In order to ensure the quality of the welding of the shell cover, the cover closing gap between the battery cell rear cover and the cylindrical shell can be detected after the battery cell rear cover and the cylindrical shell are closed and before the shell cover is welded, so that the cover closing gap of the cylindrical battery cell is ensured to be within the process range.
In the related art, an image of a gap between a rear cover of a battery cell and a cylindrical shell of the cylindrical battery cell can be acquired in a visual detection mode, and then the acquired image is processed and analyzed, so that whether the gap between the rear cover of the battery cell and the cylindrical shell meets the process requirements is determined. However, in the related art, the detection reliability is not high due to the scheme of detecting the closing gap of the cylindrical battery cell, and damage such as abrasion or scratch may occur on the surface of the cylindrical battery cell, which affects the product quality.
The embodiment of the application provides a detection system 10 for a cylindrical battery cell cover gap. As shown in fig. 1 to 6, the detecting system 10 for the gap between the covers of the cylindrical battery cells comprises one or more gap detecting stations 1, a supporting cup 2, a detecting mechanism 3, a rotary jacking mechanism 4 and a pressing mechanism 5. The support cup 2 is arranged at the gap detection station 1, and the support cup 2 is provided with a containing groove 2a for containing the cylindrical battery cell 20 and a through hole 2b penetrating through the bottom wall of the containing groove 2 a. The detection mechanism 3 is disposed at the gap detection station 1, and is used for detecting the cover closing gap 20a on the side surface of the cylindrical battery cell 20. The rotary jacking mechanism 4 is arranged below the supporting cup 2 and is used for jacking the cylindrical battery cell 20 positioned in the accommodating groove 2 a. The pressing mechanism 5 is arranged above the supporting cup 2 and is used for pressing the cylindrical battery cell 20, so that the pressing mechanism 5 and the rotary jacking mechanism 4 are clamped at two ends of the cylindrical battery cell 20 along the height direction, and the rotary jacking mechanism 4 can drive the cylindrical battery cell 20 to rotate.
The detection system 10 comprises one or more gap detection stations 1, that is, the detection system 10 can have only one gap detection station 1, or can have a plurality of gap detection stations 1, and in the case that the number of the gap detection stations 1 is multiple, the plurality of gap detection stations 1 can detect the gap 20a covered by the cylindrical battery cell 20 at the same time, so that the detection efficiency is improved.
It should be noted that, in the embodiments of the present application, the plurality refers to two or more.
The support cup 2 is arranged at the gap detection station 1 and is used for accommodating the cylindrical battery cell 20, so that the transfer and detection of the cylindrical battery cell 20 are facilitated.
The support cup 2 is provided with a holding groove 2a and a through hole 2b penetrating through the bottom wall of the holding groove 2a, the cylindrical battery cell 20 is arranged in the holding groove 2a, so that positioning of the cylindrical battery cell 20 is conveniently achieved, for example, the groove wall of the holding groove 2a can be matched with the peripheral side wall of the cylindrical battery cell 20 for righting the cylindrical battery cell 20. The rotary jacking mechanism 4 can jack the cylindrical battery cell 20 positioned in the accommodating groove 2a through the through hole 2 b.
Here, the rotary jacking mechanism 4 can drive the cylindrical battery cell 20 to rotate and jack up the cylindrical battery cell 20.
Illustratively, the detection system 10 includes a control device (not shown) for controlling the operation of the detection mechanism 3, the rotary jacking mechanism 4, and/or the pressing mechanism 5, etc. The control device may include, but is not limited to, at least one of an industrial personal computer, a programmable logic controller (Programmable Logic Controller, PLC), an upper computer, etc. The host computer may be, for example, a server, a notebook computer, a tablet computer, a desktop computer, a smart phone, or the like. In some embodiments, the control device comprises a PLC of the gap detection station 1.
The pressing mechanism 5 is used for pressing down the cylindrical battery cell 20, so that the pressing mechanism 5 and the rotary jacking mechanism 4 are clamped at two ends of the cylindrical battery cell 20 along the height direction, and at this time, a certain clamping force is arranged between the pressing mechanism 5 and the rotary jacking mechanism 4, so that the rotary jacking mechanism 4 can drive the cylindrical battery cell 20 to rotate.
In some embodiments, the control device may control the pressing mechanism 5 to press the cylindrical battery cell 20 until the pressing mechanism 5 and the rotary jacking mechanism 4 achieve a preset clamping force on the cylindrical battery cell 20 in the height direction.
In some embodiments, during the process of lifting the cylindrical battery cell 20 to the detection position by the rotary lifting mechanism 4, the clamping force of the pressing mechanism 5 and the rotary lifting mechanism 4 on the cylindrical battery cell 20 in the height direction remains substantially unchanged. It can be understood that, in the process of lifting the cylindrical battery cell 20 to the detection position by the rotary lifting mechanism 4, the pressing mechanism 5 moves upwards synchronously with the movement of the cylindrical battery cell 20, so that the clamping force of the pressing mechanism 5 and the rotary lifting mechanism 4 on the cylindrical battery cell 20 along the height direction is kept basically unchanged.
Of course, in other embodiments, in the process of lifting the cylindrical battery cell 20 to the detection position by the rotary lifting mechanism 4, the clamping force of the pressing mechanism 5 and the rotary lifting mechanism 4 on the cylindrical battery cell 20 in the height direction may also be changed according to the movement condition.
The specific type of detection mechanism 3 is not limited herein, and is, for example, a CCD visual detection system.
Here, a CCD camera, a light source, and an image processing module may be included in the CCD vision detecting system. The PLC may send control instructions to the CCD camera and light source to control the readiness of the CCD camera and control the light source to illuminate in response to detecting that the cylindrical cell 20 reaches the gap detection station 1. In addition, after detecting that the cylindrical battery cell 20 reaches the gap detection station 1, the PLC controls the rotary jacking mechanism 4 to jack up the cylindrical battery cell 20 located in the support cup 2 by a first preset distance, so that the bottom of the cylindrical battery cell 20 is separated from the bottom wall of the support cup 2, controls the pressing mechanism 5 to press down the cylindrical battery cell 20, so that the pressing mechanism 5 and the rotary jacking mechanism 4 clamp the two ends of the cylindrical battery cell 20 in the height direction, and controls the rotary jacking mechanism 4 to jack up the cylindrical battery cell 20 to the detection position.
The control device controls the rotary jacking mechanism 4 to drive the cylindrical battery cell 20 to rotate, and in the process that the cylindrical battery cell 20 rotates relative to the detection mechanism 3. The light source is used for supplementing light to the cylindrical battery cell 20 to be detected, so that the characteristics of the region to be detected in the cover clearance image acquired by the CCD camera can be better presented.
In some embodiments, the number of the gap detection stations 1 may be plural, and each gap detection station 1 may include a set of CCD vision detection systems.
In some embodiments, multiple sets of CCD vision inspection systems can independently perform lidding gap inspection for cylindrical cells 20 in multiple gap inspection stations 1.
In some embodiments, multiple sets of CCD vision inspection systems may perform cap gap inspection for cylindrical cells 20 in multiple gap inspection stations 1 in parallel and in tandem. For example, the gap detection station 1 comprises a first station and a second station, wherein the cylindrical battery cells 20 in the first station and the second station are in place at the same time; the PLC may send a first trigger signal to both the CCD vision inspection system in the first station and the CCD vision inspection system in the second station in response to detecting that the turntable 7 carries the first cylindrical battery cell to the first station and carries the second cylindrical battery cell to the second station, so as to detect the cover closing gap 20a of the side face of the first cylindrical battery cell by using the CCD vision inspection system in the first station in parallel to obtain a detection result of the first cylindrical battery cell, and detect the cover closing gap 20a of the side face of the second cylindrical battery cell by using the CCD vision inspection system in the second station to obtain a detection result of the second cylindrical battery cell.
In the detection system 10 for the cover closing gap of the cylindrical battery cell, on one hand, the rotary jacking mechanism 4 rotates by driving the cylindrical battery cell 20, and in the process that the cylindrical battery cell 20 rotates relative to the detection mechanism 3, the detection mechanism 3 detects the cover closing gap 20a of the side face of the cylindrical battery cell 20, so that the detection mechanism 3 can detect the cover closing gaps 20a of different areas of the side face of the cylindrical battery cell 20, and the reliability of the cover closing gap detection is improved. On the other hand, before the rotary jacking mechanism 4 drives the cylindrical battery cell 20 to rotate, the pressing mechanism 5 can press the cylindrical battery cell 20, so that the pressing mechanism 5 and the rotary jacking mechanism 4 can be clamped at two ends of the cylindrical battery cell 20 along the height direction, the cylindrical battery cell 20 can be in a clamped state along the height direction in the rotating process, the jumping and slipping problems of the cylindrical battery cell 20 are reduced, the reliability of cover closing gap detection is further improved, and the battery cell scratch problem is reduced. In still another aspect, before the pressing mechanism 5 presses the cylindrical battery cell 20, the rotary jacking mechanism 4 may firstly jack the cylindrical battery cell 20 located in the supporting cup 2 by a first preset distance, so that the bottom of the cylindrical battery cell 20 is separated from the bottom wall of the supporting cup 2, and thus, the pressure of the bottom wall of the cylindrical supporting cup 2 on the cylindrical battery cell 20 may be reduced, damage to the bottom of the cylindrical battery cell 20 may be reduced, and abrasion and scratch caused by the relative movement between the subsequent cylindrical battery cell 20 and the supporting cup 2 in the rotation process may be reduced.
In some embodiments, as shown in fig. 2 to 5, the rotary jacking mechanism 4 includes an elastic return member 41 and a jacking member 42. The jacking piece 42 is used for abutting against the cylindrical battery cell 20, and the elastic resetting piece 41 is matched with the jacking piece 42, so that the jacking piece 42 can stretch and retract along the height direction of the cylindrical battery cell 20 under the action of elastic force.
The specific type of the elastic restoring member 41 is not limited herein, and may be, for example, a compression spring, a tension spring, a torsion spring, or the like.
Here, through setting up elasticity restoring piece 41 and jacking piece 42 cooperation, on the one hand, can make jacking piece 42 can stretch out and draw back along the direction of height of cylinder electric core 20 under the elasticity effect of elasticity restoring piece 41, so, can be applicable to not high dimensional cylinder electric core 20, improves detecting system 10's suitability. On the other hand, the rotary jacking mechanism 4 can be clamped at the end of the cylindrical battery cell 20 in the height direction under the action of the elastic force, in other words, the rotary jacking mechanism 4 is not in hard contact with the cylindrical battery cell 20, so that the damage to the bottom of the cylindrical battery cell 20 is further reduced.
In some embodiments, as shown in fig. 2 to 5, the rotary jacking mechanism 4 further includes a first driving piece 43, a second driving piece, and a connecting portion 44. The connection portion 44 is slidably connected with the jack 42 in the height direction of the cylindrical cell 20. The elastic restoring member 41 is disposed between the connecting portion 44 and the lifting member 42. The first driving member 43 rotates through the driving connection portion 44 and drives the jacking member 42 to rotate. The second driving member moves along the height direction of the cylindrical battery cell 20 through the driving connection portion 44, and drives the lifting member 42 to lift the cylindrical battery cell 20.
Taking the elastic restoring member 41 as a compression spring for example, the elastic restoring member 41 is disposed between the connecting portion 44 and the jacking member 42, and the elastic restoring member 41 may be connected to the connecting portion 44, or may be connected to the jacking member 42, or may be connected to the connecting portion 44 and the jacking member 42 at two ends of the elastic restoring member 41.
The connecting portion 44 and the jacking member 42 are slidably connected along the height direction of the cylindrical battery cell 20, so that the connecting portion 44 and the jacking member 42 can relatively displace along the height direction of the cylindrical battery cell 20 under the action of the elastic force of the elastic resetting member 41, and the jacking member 42 stretches and contracts along the height direction of the cylindrical battery cell 20 under the action of the elastic force.
The specific type of the first driving member 43 is not limited herein, and is, for example, a motor or the like.
The specific type of the second driving member (not shown) is not limited herein, and is, for example, a linear module or the like.
The second driving member moves along the height direction of the cylindrical battery cell 20 through the driving connection portion 44 and drives the lifting member 42 to lift the cylindrical battery cell 20, where the second driving member may drive the first driving member 43 to move along the height direction of the cylindrical battery cell 20 together.
The rotary jacking mechanism 4 is provided with the first driving part 43, the second driving part and the connecting part 44, the elastic resetting part 41 is arranged between the connecting part 44 and the jacking part 42, the first driving part 43 rotates through the driving connecting part 44 so as to drive the jacking part 42 to rotate, and the second driving part drives the jacking part 42 to jack the cylindrical battery cell 20 through the driving connecting part 44, so that the rotary jacking mechanism 4 can rotate and jack the cylindrical battery cell 20, and the rotary jacking mechanism 4 is simple and compact in structure.
It should be noted that the specific mating structure of the connection portion 44 and the jack 42 is not limited herein.
In some embodiments, referring to fig. 3 and 5, the lifting member 42 includes a lifting portion 421, a first rotating shaft 422 connected to the lifting portion 421, and a first stopper member 423 protruding along a circumferential direction of the first rotating shaft 422. The connection portion 44 includes a connection shaft 441 connected to the first driving member 43, a second rotation shaft 442 connected to the connection shaft 441, and a second stopper 443 protruding in a circumferential direction of the second rotation shaft 442. The elastic restoring member 41 is disposed between the first stopper 423 and the second stopper 443. The first rotating shaft 422 is sleeved on the second rotating shaft 442, or the second rotating shaft 442 is sleeved on the first rotating shaft 422. One of the first rotation shaft 422 and the second rotation shaft 442 is provided with a sliding groove 442a extending along the height direction of the cylindrical battery cell 20, the other is provided with a sliding column 422a in sliding fit with the sliding groove 442a, and the connecting part 44 can drive the jacking member 42 to rotate through the sliding column 422a and the sliding groove 442a in matching.
The specific shape of the first stopper 423 is not limited herein, and may be, for example, a circular or square plate-like structure, but may be other shaped structures.
The specific shape of the second stop 443 is not limited herein, and may be, for example, a circular or square plate-like structure, but may be other shaped structures.
The elastic restoring member 41 is disposed between the first stop member 423 and the second stop member 443 to achieve elastic engagement between the connection portion 44 and the jack member 42. For example, when the jack 42 abuts against the cylindrical cell 20, the jack 42 compresses the elastic restoring member 41 via the first stopper 423, and at this time, the elastic restoring member 41 is in a compressed state, and when the jack 42 is out of contact with the cylindrical cell 20, the elastic restoring member 41 returns to its elastic deformation.
The specific matching relationship between the first shaft 422 and the second shaft 442 is not limited herein, and the first shaft 422 may be sleeved on the second shaft 442, or the second shaft 442 may be sleeved on the first shaft 422. In the embodiment of the present application, the first rotating shaft 422 is sleeved on the second rotating shaft 442, so that the second rotating shaft 442 is of a hollow structure, and the first rotating shaft 422 is slidably disposed in the second rotating shaft 442.
One of the first and second rotating shafts 422 and 442 is provided with a sliding groove 442a extending along the height direction of the cylindrical battery cell 20, wherein the other sliding groove 422a is provided with a sliding post 422a in sliding fit with the sliding groove 442a, which means that the first rotating shaft 422 is provided with the sliding groove 442a, the second rotating shaft 442 is provided with the sliding post 422a, or the second rotating shaft 442 is provided with the sliding groove 442a, and the first rotating shaft 422 is provided with the sliding post 422 a.
The rotary jacking mechanism 4 of the embodiment of the application is respectively abutted against the two ends of the elastic restoring member 41 by arranging the first stop member 423 and the second stop member 443 so as to be applicable to different types of cylindrical battery cells 20. The first rotating shaft 422 is sleeved on the second rotating shaft 442 to improve the connection stability between the jacking piece 42 and the connecting part 44, and the sliding groove 442a is arranged on the second rotating shaft 442, the sliding column 422a is arranged on the first rotating shaft 422 and slides in the sliding groove 442a to realize the extension and retraction between the jacking piece 42 and the connecting part 44, and the connecting part 44 drives the jacking piece 42 to rotate by being matched with the sliding column 422a through the groove wall of the sliding groove 442 a.
In some embodiments, referring to fig. 2 and 6, the junction of the bottom wall and the side wall of the accommodating groove 2a is recessed to form a groove 2c.
Here, the recess 2c may be formed in the bottom wall of the accommodating groove 2a, may be formed in the side wall of the accommodating groove 2a, may be formed by the bottom wall and the side wall of the accommodating groove 2a together to form the recess 2c, or may be formed by both the bottom wall and the side wall of the accommodating groove 2a to form the recess 2c.
It can be appreciated that after the support cup 2 is used for a long time, impurities such as dust can be inevitably accumulated at the root of the inner side of the support cup 2 (i.e. the junction between the bottom wall and the side wall of the accommodating groove 2 a), and the recess 2c is formed by recessing the junction between the bottom wall and the side wall of the accommodating groove 2a, so that the impurities such as dust accumulated at the bottom of the support cup 2 can be accommodated, and the situation that the electric core is polluted by the impurities such as dust accumulated at the bottom of the support cup 2 or the electric core is jammed in the support cup 2 is improved.
In some embodiments, the hold-down mechanism 5 includes a third drive member (not shown) and a hold-down 51. The detection system 10 further includes an encoder 6 provided on the hold-down portion 51. The third driving member is used for driving the pressing part 51 to press the cylindrical battery cell 20. The cylindrical battery cell 20 rotates to drive the pressing part 51 and the encoder 6 to rotate. And the rotation axes of the cylindrical battery cell 20, the pressing part 51 and the encoder 6 are the same. In the process of following the rotation of the cylindrical battery cell 20, the encoder 6 outputs a detection trigger signal to the detection mechanism 3 at preset rotation angles at intervals so as to control the detection mechanism 3 to detect the cover closing gap 20a of the cylindrical battery cell 20.
The control device controls the third driving member to drive the pressing portion 51 to press the cylindrical battery cell 20 so that the pressing portion 51 and the rotary jacking mechanism 4 are clamped at both ends of the cylindrical battery cell 20 in the height direction.
Here, the preset rotation angle may be predetermined according to an actual detection requirement, which is not limited in the embodiment of the present application.
In some embodiments, a plurality of detection points which are uniformly distributed along the circumference in turn may be selected on a circle where the cover closing gap 20a on the side surface of the cylindrical battery cell 20 is located, with a point closest to the detection mechanism 3 before the rotation of the cylindrical battery cell 20 as an initial detection point, and an angle of a central angle corresponding to an arc between two adjacent detection points is used as a preset rotation angle, that is, one detection point is selected at each preset rotation angle. It can be understood that, since the preset rotation angle is an angle of a central angle corresponding to an arc between two adjacent detection points, and the encoder 6 outputs a detection trigger signal to the detection mechanism 3 every interval of the preset rotation angle in the process of following the rotation of the cylindrical battery core 20, each time the encoder 6 outputs the detection trigger signal to the detection mechanism 3, a point closest to the detection mechanism 3 on a circle where the cover closing gap 20a on the side surface of the cylindrical battery core 20 is located is a detection point, so that the detection mechanism 3 can detect the cover closing gap 20a in a side surface area where the detection point is located in response to receiving the detection trigger signal.
It can be understood that the detection points can be uniformly distributed on the 360-degree circle (the circle where the cover gap 20a of the cylindrical cell 20 is located) according to the actual detection requirement, and the number of the detection points is not limited herein, for example, greater than or equal to three points. Illustratively, when the number of detection points is three, one detection point is selected every 120 ° interval; when the number of the detection points is four, selecting one detection point at each interval of 90 degrees; when the number of the detection points is five, selecting one detection point at each interval of 72 degrees; when the number of detection points is six, one detection point is selected every 60 degrees.
In the above embodiment, since the encoder 6 on the pressing portion 51 is driven to rotate by the cylindrical battery cell 20 through rotation, and the encoder 6 is the same as the rotation axis of the cylindrical battery cell 20, in this way, the rotation angle of the cylindrical battery cell 20 can be sensed by the encoder 6, so that the detection trigger signal is output to the detection mechanism 3 through the encoder 6 in the process of following the rotation of the cylindrical battery cell 20 at preset rotation angles at intervals, and the detection mechanism 3 can be simply and accurately controlled to detect the cover closing gaps 20a of a plurality of areas on the side surface of the cylindrical battery cell 20.
In some embodiments, referring to fig. 1, the detection system 10 further includes a rotatable turntable 7, the cup holder 2 is disposed on the turntable 7, and the detection mechanism 3 is disposed outside the turntable 7.
The control device controls the turntable 7 to rotate so as to convey the cylindrical battery cell 20 to the gap detection station 1 through the supporting cup 2 and make the cylindrical battery cell 20 coaxial with the rotation shaft of the rotary jacking mechanism 4.
In some embodiments, the turntable 7 may transport the cylindrical cells 20 from the capping station 8 to the gap detection station 1 via the backing cup 2.
In the above embodiment, the cylindrical battery cell 20 is placed in the supporting cup 2, and the supporting cup 2 is rotated by the turntable 7 to realize movement of the battery cell, so that the cylindrical battery cell 20 can be stably conveyed to the gap detection station 1, and the supporting cup 2 can perform a centralizing function on the cylindrical battery cell 20, so that the cylindrical battery cell 20 is kept coaxial with the rotating shaft of the rotary jacking mechanism 4, stability of the rotation process of the cylindrical battery cell 20 can be improved, reliability of cover closing gap detection is improved, and the problem of battery cell scratch is reduced.
Referring to fig. 1, the inspection system 10 further includes a capping station 8, where the capping station 8 is configured to cap the rear cap of the cylindrical battery cell 20 with the steel can. Along the circulation direction of the turntable 7, the cover closing station 8 is located upstream of the gap detecting station 1, that is, the rear cover of the cylindrical battery cell 20 and the steel shell are firstly closed at the cover closing station 8, and after the cover is closed, the circulation is transferred to the gap detecting station 1 so as to detect the cover closing gap 20a of the cylindrical battery cell 20.
For example, referring to fig. 1, the inspection system 10 further includes a welding station 9, and the welding station 9 is located downstream of the gap inspection station 1 along the flow direction of the turntable 7, that is, after the cover closing gap of the cylindrical battery cell 20 is inspected, the cover closing gap is inspected, and then flows to the welding station 9, and the rear cover of the cylindrical battery cell 20 is welded with the steel shell at the welding station 9, so as to realize packaging.
The embodiment of the application provides a detection method for a cylindrical battery cell cover gap, which is applied to a detection system 10 for the cylindrical battery cell cover gap. As shown in fig. 1 to 6, the detection system 10 includes a control device, a cup holder 2, a detection mechanism 3, a rotary jack mechanism 4, and a pressing mechanism 5.
Fig. 7 is a schematic implementation flow diagram of a method for detecting a cover closing gap of a cylindrical battery cell according to an embodiment of the present application, as shown in fig. 7, the method for detecting a cover closing gap of a cylindrical battery cell includes steps S701 to S704 as follows:
in step S701, the control device controls the rotary lifting mechanism to lift the cylindrical battery cell located in the support cup by a first preset distance, so that the bottom of the cylindrical battery cell is separated from the bottom wall of the support cup.
Here, the control device is used to control the operation process of the detection mechanism 3, the rotary jacking mechanism 4, the pressing mechanism 5, and the like. The control device may include, but is not limited to, at least one of an industrial personal computer, a programmable logic controller (Programmable Logic Controller, PLC), an upper computer, etc. The host computer may be, for example, a server, a notebook computer, a tablet computer, a desktop computer, a smart phone, or the like. In some embodiments, the control device comprises a PLC of the gap detection station 1.
It can be appreciated that, after the cylindrical battery cell 20 is lifted by the rotary lifting mechanism 4 by the first preset distance, the bottom of the cylindrical battery cell 20 can be separated from the bottom wall of the supporting cup 2. In implementation, a person skilled in the art may set an appropriate first preset distance according to practical situations, which is not limited in the embodiment of the present application.
In some embodiments, referring to fig. 2 and 6, the supporting cup 2 is provided with a receiving groove 2a for receiving the cylindrical battery cell 20 and a through hole 2b penetrating through the bottom wall of the receiving groove 2a, and the rotary lifting mechanism 4 can lift the cylindrical battery cell 20 located in the receiving groove 2a through the through hole 2 b.
In step S702, the control device controls the pressing mechanism to press the cylindrical battery cell, so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction.
Here, when the pushing mechanism 5 and the rotary jacking mechanism 4 are clamped at both ends of the cylindrical battery cell 20 in the height direction, a certain clamping force is provided between the pushing mechanism 5 and the rotary jacking mechanism 4.
In some embodiments, referring to fig. 2 and 3, the control device may control the pressing mechanism 5 to press the cylindrical battery cell 20 until the pressing mechanism 5 and the rotary jacking mechanism 4 achieve a preset clamping force on the cylindrical battery cell 20 along the height direction.
In step S703, the control device controls the rotary lifting mechanism to lift the cylindrical battery cell to the detection position.
After the pressing mechanism 5 and the rotary jacking mechanism 4 are clamped at two ends of the cylindrical battery cell 20 along the height direction, the control device can control the rotary jacking mechanism 4 to jack up the cylindrical battery cell 20 until reaching the detection position.
In some embodiments, during the process of lifting the cylindrical battery cell 20 to the detection position by the rotary lifting mechanism 4, the clamping force of the pressing mechanism 5 and the rotary lifting mechanism 4 on the cylindrical battery cell 20 in the height direction remains substantially unchanged. It can be understood that, in the process of lifting the cylindrical battery cell 20 to the detection position by the rotary lifting mechanism 4, the pressing mechanism 5 moves upwards synchronously with the movement of the cylindrical battery cell 20, so that the clamping force of the pressing mechanism 5 and the rotary lifting mechanism 4 on the cylindrical battery cell 20 along the height direction is kept basically unchanged.
In step S704, the control device controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, and controls the detection mechanism to detect a cover closing gap on the side surface of the cylindrical battery cell in the process that the cylindrical battery cell rotates relative to the detection mechanism.
It can be understood that the detection position is within the detection range of the detection mechanism 3, and after the rotary jacking mechanism 4 jacks up the cylindrical battery cell 20 to the detection position, the detection mechanism 3 can detect the cover closing gap 20a on the side surface of the cylindrical battery cell 20 reaching the detection position. In practice, the detection position may be determined in advance according to the setting position of the detection mechanism 3, which is not limited in the embodiment of the present application.
In some embodiments, the control device may directly send a detection control instruction to the detection mechanism 3 to control the detection mechanism 3 to detect the cover closing gap 20a on the side surface of the cylindrical battery cell 20 in the process of rotating the cylindrical battery cell 20 relative to the detection mechanism 3. For example, the rotation angle of the cylindrical battery cell 20 at a certain time may be determined based on the rotation speed at which the cylindrical battery cell 20 is driven to rotate by the rotary jack mechanism 4, and when the cylindrical battery cell 20 reaches a specific rotation angle, a detection control instruction may be sent to the detection mechanism 3 so that the detection mechanism 3 detects the cover closing gap 20a on the side surface of the cylindrical battery cell 20 when the cylindrical battery cell 20 is at the rotation angle. Here, the specific rotation angle may be determined according to an actual detection requirement, and the number of the specific rotation angles may be plural, which is not limited in the embodiment of the present application. For example, a plurality of detection points may be selected on a circle where the cover closing gap 20a on the side surface of the cylindrical battery cell 20 is located, and each detection point may correspond to a specific rotation angle; when the cylindrical battery cell 20 reaches a certain specific rotation angle during the rotation of the cylindrical battery cell 20, the detection point corresponding to the rotation angle faces the detection mechanism 3 and is located in the detection range of the detection mechanism 3.
In some embodiments, referring to fig. 2 and 3, an encoder 6 capable of coaxially rotating along with the cylindrical battery cell 20 may be disposed on the pressing mechanism 5 or the rotary lifting mechanism 4, where the encoder 6 is configured to output a detection trigger signal to the detection mechanism 3 when a specific rotation angle is reached during the rotation along with the cylindrical battery cell 20, so as to control the detection mechanism 3 to detect the cover closing gap 20a on the side surface of the cylindrical battery cell 20.
In some embodiments, referring to fig. 2 and 3, the detecting mechanism 3 may be disposed obliquely above the supporting cup 2, and the detecting mechanism 3 may include an image capturing device, where, when the cylindrical battery cell 20 reaches the detecting position, a camera of the image capturing device faces the cover closing gap 20a of the side surface of the cylindrical battery cell 20, so as to perform image capturing on the cover closing gap 20a of the side surface area of the cylindrical battery cell 20 located in the view range of the image capturing device, and detect the cover closing gap 20a of the side surface area based on the captured image.
In some embodiments, referring to fig. 2 to 5, the rotary jacking mechanism 4 further includes a first driving member 43, a second driving member, and a connecting portion 44, wherein the connecting portion 44 is slidably connected to the jacking member 42 along the height direction of the cylindrical battery cell 20, and the elastic restoring member 41 is disposed between the connecting portion 44 and the jacking member 42. The control device can control the first driving member 43 to rotate through the driving connection portion 44 and drive the jacking member 42 to rotate. The control device can control the second driving member to move along the height direction of the cylindrical battery cell 20 through the driving connection portion 44, and drive the jacking member 42 to jack the cylindrical battery cell 20.
In some embodiments, the control device may increase the rotation speed of the cylindrical battery cell 20 to the target rotation speed in a flexible acceleration manner during the control process of the rotary jacking mechanism 4 to drive the cylindrical battery cell 20 to rotate. In practice, any suitable flexible acceleration mode may be used, and embodiments of the present application are not limited in this regard. In this way, the situation of rapid acceleration in the process of rotating the battery cell can be reduced, and the situation that the battery cell end face is scratched due to the relative movement of the contact surface of the battery cell and the rotary jacking mechanism 4 and the contact surface of the pressing mechanism 5 in the process of rotating the cylindrical battery cell 20 is reduced. For example, the rotational speed of the cylindrical cell 20 may be increased to the target rotational speed with a first acceleration that is greater than 0 and less than a preset first acceleration threshold.
In some embodiments, the control device may further control the rotary jacking mechanism 4 to stop driving the rotation of the cylindrical battery cell 20 after completing the detection of the cover closing gap 20a of the cylindrical battery cell 20, and may reduce the rotation speed of the cylindrical battery cell 20 from the target rotation speed to 0 in a flexible deceleration manner under the condition that the control device controls the rotary jacking mechanism 4 to stop driving the rotation of the cylindrical battery cell 20. In practice, any suitable flexible deceleration means may be employed, and embodiments of the present application are not limited in this regard. In this way, the situation of rapid deceleration in the process of stopping rotation of the battery cell can be reduced, and the situation that the battery cell end face is scratched due to relative movement of the battery cell, the contact surface of the rotary jacking mechanism 4 and the contact surface of the pressing mechanism 5 in the process of stopping rotation of the cylindrical battery cell 20 is reduced. For example, the rotational speed of the cylindrical battery cell 20 may be reduced from the target rotational speed to 0 using a second acceleration, wherein the second acceleration is less than 0 and greater than a preset second acceleration threshold.
In the method for detecting the cover closing gap of the cylindrical battery cell, on one hand, the control device controls the rotary jacking mechanism 4 to drive the cylindrical battery cell 20 to rotate, and controls the detection mechanism 3 to detect the cover closing gap 20a on the side surface of the cylindrical battery cell 20 in the process that the cylindrical battery cell 20 rotates relative to the detection mechanism 3, so that the detection mechanism 3 can detect the cover closing gaps 20a in different areas on the side surface of the cylindrical battery cell 20, and the reliability of cover closing gap detection is improved; on the other hand, before the rotary jacking mechanism 4 drives the cylindrical battery cell 20 to rotate, the cylindrical battery cell 20 is pressed down by controlling the pressing mechanism 5, so that the pressing mechanism 5 and the rotary jacking mechanism 4 are clamped at two ends of the cylindrical battery cell 20 along the height direction, the cylindrical battery cell 20 can be in a clamped state along the height direction in the rotation process, the jumping and slipping problems of the cylindrical battery cell 20 are reduced, the reliability of cover closing gap detection is further improved, and the battery cell scratch problem is reduced; in still another aspect, before the pressing mechanism 5 presses the cylindrical battery cell 20, the rotary jacking mechanism 4 is controlled to jack the cylindrical battery cell 20 located in the supporting cup 2 by a first preset distance, so that the bottom of the cylindrical battery cell 20 is separated from the bottom wall of the supporting cup 2, and thus, the pressure of the bottom wall of the cylindrical supporting cup 2 on the cylindrical battery cell 20 can be reduced, the damage to the bottom of the cylindrical battery cell 20 can be reduced, and abrasion and scratch caused by the relative movement between the subsequent cylindrical battery cell 20 and the supporting cup 2 in the rotation process can be reduced.
In some embodiments, the detection method may further comprise: the control device sends a result request signal of the cylindrical battery cell 20 to the detection mechanism 3; the detection mechanism 3 transmits the detection result to the control device in response to the result request signal.
In some embodiments, referring to fig. 2 and 3, the pressing mechanism 5 includes a third driving member and a pressing portion 51, and the detecting system 10 further includes an encoder 6 disposed on the pressing portion 51.
The step S702 may include the following step S711:
in step S711, the control device controls the third driving member to drive the pressing portion to press the cylindrical battery cell, so that the pressing portion and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction.
The above step S704 may include the following steps S712 to S713:
step S712, the control device controls the rotary jacking mechanism to drive the cylindrical electric core to rotate, and the cylindrical electric core drives the pressing portion and the encoder to rotate through rotation, and the rotation axes of the cylindrical electric core, the pressing portion and the encoder are the same.
In step S713, the encoder outputs a detection trigger signal to the detection mechanism at each preset rotation angle in the process of following the rotation of the cylindrical battery cell, so as to control the detection mechanism to detect the cover closing gap of the cylindrical battery cell.
Here, the preset rotation angle may be predetermined according to an actual detection requirement, which is not limited in the embodiment of the present application.
In some embodiments, a plurality of detection points which are uniformly distributed along the circumference in turn may be selected on a circle where the cover closing gap 20a on the side surface of the cylindrical battery cell 20 is located, with a point closest to the detection mechanism 3 before the rotation of the cylindrical battery cell 20 as an initial detection point, and an angle of a central angle corresponding to an arc between two adjacent detection points is used as a preset rotation angle, that is, one detection point is selected at each preset rotation angle. It can be understood that, since the preset rotation angle is an angle of a central angle corresponding to an arc between two adjacent detection points, and the encoder 6 outputs a detection trigger signal to the detection mechanism 3 every interval of the preset rotation angle in the process of following the rotation of the cylindrical battery core 20, each time the encoder 6 outputs the detection trigger signal to the detection mechanism 3, a point closest to the detection mechanism 3 on a circle where the cover closing gap 20a on the side surface of the cylindrical battery core 20 is located is a detection point, so that the detection mechanism 3 can detect the cover closing gap 20a in a side surface area where the detection point is located in response to receiving the detection trigger signal.
In the above embodiment, since the encoder 6 on the pressing portion 51 is driven to rotate by the cylindrical battery cell 20 through rotation, and the encoder 6 is the same as the rotation axis of the cylindrical battery cell 20, in this way, the rotation angle of the cylindrical battery cell 20 can be sensed by the encoder 6, so that the detection trigger signal is output to the detection mechanism 3 through the encoder 6 in the process of following the rotation of the cylindrical battery cell 20 at preset rotation angles at intervals, and the detection mechanism 3 can be simply and accurately controlled to detect the cover closing gaps 20a of a plurality of areas on the side surface of the cylindrical battery cell 20.
In some embodiments, the detection mechanism 3 includes an image acquisition module and an image processing module.
The above step S713 may include the following steps S721 to S722:
in step S721, the encoder outputs a detection trigger signal to the image acquisition module at each preset rotation angle, so as to control the image acquisition module to acquire images of the side surface of the cylindrical battery cell at intervals of the preset rotation angle, thereby obtaining a plurality of cover closing gap images of the cylindrical battery cell.
Step S722, the image processing module detects the capping gap on the side surface of the cylindrical battery cell based on the plurality of capping gap images, so as to obtain a detection result.
Here, each cover clearance image is obtained by image acquisition of a certain area on the side surface of the cylindrical cell 20 by the image acquisition device, and includes the cover clearance 20a in the area.
The image acquisition module may include, but is not limited to, at least one of a two-dimensional camera, a three-dimensional camera, a depth camera, a line scan camera, a facial scan camera, and the like. For example, the image acquisition module may include a two-dimensional line scan charge coupled device (Charge Coupled Device, CCD) camera.
The image processing module may be an electronic computing device with logical operation functions including, but not limited to, a server or an industrial computer, etc. The image processing module can establish communication connection with the image acquisition module in a wired or wireless mode, so that the cover closing gap image acquired by the image acquisition module is received.
In implementation, the image processing module may perform the cover closing gap detection based on each cover closing gap image, or the image processing module may splice a plurality of cover closing gap images into one cover opening gap image, and perform the cover closing gap detection based on one spliced cover opening gap image.
In some implementations, the image acquisition module includes a depth camera, and each of the overlay gap images may include a depth map and a two-dimensional image; the image processing module can adopt a deep learning+point cloud detection algorithm to check the capping gap 20a on the side surface of the cylindrical battery cell 20 based on the capping gap image, so as to obtain a detection result. For example, the image processing module may spatially align a depth image and a two-dimensional image included in each capping gap image, convert the depth image into point cloud data, and then perform capping gap detection based on the aligned two-dimensional image and point cloud data by using a deep learning+point cloud detection algorithm; in the process of detecting the capping gap, firstly, a deep learning+point cloud detection algorithm can be utilized to determine an area of interest in the aligned two-dimensional image and/or point cloud data, then, the capping gap detection is carried out according to the determined area of interest, a detection result is obtained and output to a display device, and the display device can display the detection result in a display interface. Here, the region of interest may be a region to be detected located by an algorithm, for example, the region of interest may include a region where the capping gap 20a is located.
In the above embodiment, the encoder 6 outputs the detection trigger signal to the image acquisition module at each preset rotation angle, so that the image acquisition module can be controlled to acquire images of the cover closing gaps 20a of different areas on the side surface of the cylindrical battery cell 20 at intervals of the preset rotation angle, and the image processing module can detect the cover closing gaps 20a of the side surface of the cylindrical battery cell 20 more rapidly and accurately based on the acquired cover closing gap images of a plurality of areas.
In some embodiments, the step S722 may include the following steps S731 to S732:
in step S731, the image processing module detects, for each of the cover closing gap images, a cover closing gap on a side surface of the cylindrical battery cell, and obtains a detection result corresponding to the cover closing gap image.
Step S732, determining that the capping gap of the cylindrical battery cell is not abnormal when the detection result corresponding to each capping gap image indicates that the capping gap meets the preset process requirement.
Here, any suitable image recognition algorithm may be adopted to perform width recognition on the cover closing gap 20a in the cover closing gap image, so as to obtain the width of the part of the cover closing gap 20a corresponding to the cover closing gap image, and further determine whether the width of the part of the cover closing gap 20a meets the preset process requirement. The preset process requirements may be preset by a person skilled in the art according to the actual application scenario, which is not limited in the embodiment of the present application.
In the above embodiment, the cover closing gap detection can be performed by using each cover closing gap image, so as to obtain detection results corresponding to the cover closing gap images respectively, and by determining that the cover closing gap 20a of the cylindrical battery cell 20 is not abnormal under the condition that the cover closing gap 20a meets the preset process requirement according to the detection results corresponding to the cover closing gap images respectively, the cover closing gap 20a of the cylindrical battery cell 20 is detected more comprehensively, and the accuracy of the overall detection result of the cover closing gap 20a is improved, so that the produced battery cell product can better meet the process requirement.
In some embodiments, referring to fig. 1, the detection system 10 further includes a rotatable turntable 7, the support cup 2 is disposed on the turntable 7, and the detection mechanism 3 is disposed outside the turntable 7.
The detection method may further include the following step S741 before the above step S701:
in step S741, the control device controls the turntable to rotate, so as to convey the cylindrical battery cell to the gap detection station through the support cup, and make the cylindrical battery cell coaxial with the rotation shaft of the rotary jacking mechanism.
In some embodiments, referring to fig. 1, turntable 7 may transport cylindrical cells 20 from capping station 8 to gap detection station 1 via backing cup 2.
In the above embodiment, the cylindrical battery cell 20 is placed in the supporting cup 2, and the supporting cup 2 is rotated by the turntable 7 to realize movement of the battery cell, so that the cylindrical battery cell 20 can be stably conveyed to the gap detection station 1, and the supporting cup 2 can perform a centralizing function on the cylindrical battery cell 20, so that the cylindrical battery cell 20 is kept coaxial with the rotating shaft of the rotary jacking mechanism 4, stability of the rotation process of the cylindrical battery cell 20 can be improved, reliability of cover closing gap detection is improved, and the problem of battery cell scratch is reduced.
The detection method of the cylindrical battery cell cover closing gap provided in the embodiment of the application is described below by taking a control device as a PLC and the detection mechanism 3 as a CCD visual detection system as an example.
Fig. 8 is a second implementation flow chart of a method for detecting a cover closing gap of a cylindrical battery cell according to an embodiment of the present application, as shown in fig. 8, the method includes the following steps S801 to S808:
step S801, the PLC controls the turntable to rotate so as to convey the cylindrical battery cell to a gap detection station through the support cup and enable the cylindrical battery cell to be coaxial with a rotating shaft of the rotary jacking mechanism;
step S802, the PLC controls the CCD camera to be ready;
step S803, the PLC controls the light source to be lightened;
here, a CCD camera, a light source, and an image processing module may be included in the CCD vision detecting system. The PLC may send control instructions to the CCD camera and light source to control the readiness of the CCD camera and control the light source to illuminate in response to detecting that the cylindrical cell 20 reaches the gap detection station 1. In addition, after the PLC detects that the cylindrical battery cell 20 reaches the gap detection station 1, controlling the rotary jacking mechanism 4 to jack up the cylindrical battery cell 20 located in the support cup 2 by a first preset distance so as to separate the bottom of the cylindrical battery cell 20 from the bottom wall of the support cup 2, controlling the pressing mechanism 5 to press down the cylindrical battery cell 20, so that the pressing mechanism 5 and the rotary jacking mechanism 4 clamp the two ends of the cylindrical battery cell 20 in the height direction, and controlling the rotary jacking mechanism 4 to jack up the cylindrical battery cell 20 to the detection position; then, the control device controls the rotary jacking mechanism 4 to drive the cylindrical battery cell 20 to rotate. The light source is used for supplementing light to the cylindrical battery cell 20 to be detected, so that the characteristics of the region to be detected in the cover clearance image acquired by the CCD camera can be better presented.
In some embodiments, the light source may be a coaxial light source, and/or a linear sweep bar light source, or the like.
Step S804, the CCD camera acquires images of the side surface of the cylindrical battery cell with a preset rotation angle as an interval in the process of rotating the cylindrical battery cell, so as to obtain a plurality of cover closing gap images of the cylindrical battery cell;
in step S805, the image processing module detects the capping gap on the side surface of the cylindrical battery cell based on the multiple capping gap images, and obtains and outputs a detection result to the PLC.
In some embodiments, the image processing module may be provided with visual detection software, which is configured to detect the capping gap 20a on the side of the cylindrical battery cell 20 based on a plurality of capping gap images by adopting a preset detection algorithm.
Step S806, the PLC judges whether the covering gap of the cylindrical battery cell is abnormal according to the detection result; if yes, go to step S807; if not, the process advances to step S808.
Step S807, the PLC marks the state of the cylindrical battery cell as an abnormal state;
in step S808, the PLC controls the turntable to rotate so as to convey the cylindrical battery cell to the next station.
In some embodiments, the control device may further include a host computer, and the image processing module may send the detection result to the PLC and the host computer according to a transmission control protocol (Transmission Control Protocol, TCP), and the host computer may feed back the detection result to the production execution system (Manufacturing Execution System, MES).
Fig. 9 is a schematic diagram of a communication flow between a PLC and a CCD vision detection system in a method for detecting a cover closing gap of a cylindrical battery cell according to an embodiment of the present application. As shown in fig. 9, based on the communication flow, the detection method includes the following steps S901 to S907:
step S901, a PLC responds to detection that a rotary table conveying cylindrical battery cell reaches a gap detection station, and a first trigger signal is sent to a CCD visual detection system;
here, the first trigger signal may be used as a control command sent by the PLC to the CCD camera and the light source in the CCD vision detecting system, for controlling the readiness of the CCD camera and controlling the light source to be turned on.
After the PLC sends the first trigger signal to the CCD visual detection system, the PLC waits for a reset signal returned after the CCD visual detection system is ready. If the PLC waits for the reset signal to timeout, the process advances to step S902. If the PLC successfully receives the reset signal before the timeout, the process proceeds to step S903.
In addition, when the PLC detects that the turntable 7 conveys the cylindrical battery cell 20 to the gap detection station 1, the PLC can also acquire the battery cell code information of the cylindrical battery cell 20 and send the battery cell code information to the CCD vision detection system.
Step S902, the PLC alarms and enters an exception handling flow;
Step S903, the PLC sends a second trigger signal to the CCD visual detection system and judges whether the CCD camera is successful in collecting the image or not;
here, the PLC may drive the cylindrical battery cell 20 to rotate by controlling the rotary jacking mechanism 4, and make the cylindrical battery cell 20 drive the pressing part 51 and the encoder 6 to rotate by rotating, and the rotation axes of the cylindrical battery cell 20, the pressing part 51 and the encoder 6 are the same; so that the encoder 6 outputs a second trigger signal (corresponding to the detection trigger signal in the foregoing embodiment) to the CCD visual detection system at each preset rotation angle in the process of following the rotation of the cylindrical battery cell 20, so as to control the CCD camera in the CCD visual detection system to perform image acquisition on the side surface of the cylindrical battery cell 20 at intervals of the preset rotation angle, thereby obtaining a plurality of cover closing gap images of the cylindrical battery cell 20. The image processing module in the CCD visual detection system detects the cover closing gap 20a on the side surface of the cylindrical battery cell 20 based on a plurality of cover closing gap images, and a detection result is obtained.
After the PLC sends the second trigger signal to the CCD visual detection system, judging whether the CCD camera is successful in acquiring the image or not, and if the CCD camera is failed in acquiring the image, entering step S904; if the image acquisition by the CCD camera is successful, the process proceeds to step S905.
Step S904, the PLC sends a second trigger signal to the CCD visual detection system again, or enters an abnormal processing flow;
step S905, the PLC sends a result request signal to the CCD visual detection system and judges whether the result request signal is reset or not;
here, after the CCD visual inspection system receives the result request signal, the result request signal is reset, and after the PLC sends the result request signal to the CCD visual inspection system, whether the CCD visual inspection system receives the result request signal is determined by determining whether the result request signal is reset.
If the PLC waits for the result request signal reset timeout, then step S906 is entered; if the PLC determines that the reset of the result request signal is successful, it proceeds to step S907.
Step S906, the PLC alarms and enters an exception handling procedure.
In step S907, the CCD vision detection system transmits the detection result to the PLC.
In some embodiments, the number of the gap detection stations 1 may be plural, and each gap detection station 1 may include a set of CCD vision detection systems.
In some embodiments, multiple sets of CCD vision inspection systems can independently perform lidding gap inspection for cylindrical cells 20 in multiple gap inspection stations 1.
In some embodiments, multiple sets of CCD vision inspection systems may perform cap gap inspection for cylindrical cells 20 in multiple gap inspection stations 1 in parallel and in tandem. For example, the gap detection station 1 comprises a first station and a second station, wherein the cylindrical battery cells 20 in the first station and the second station are in place at the same time; the PLC may send a first trigger signal to both the CCD vision inspection system in the first station and the CCD vision inspection system in the second station in response to detecting that the turntable 7 carries the first cylindrical battery cell to the first station and carries the second cylindrical battery cell to the second station, so as to detect the cover closing gap 20a of the side face of the first cylindrical battery cell by using the CCD vision inspection system in the first station in parallel to obtain a detection result of the first cylindrical battery cell, and detect the cover closing gap 20a of the side face of the second cylindrical battery cell by using the CCD vision inspection system in the second station to obtain a detection result of the second cylindrical battery cell.
In the description of the present application, reference to the terms "one embodiment," "in some embodiments," "in other embodiments," "in yet other embodiments," or "exemplary" etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application are included in the protection scope of the present application.
Claims (10)
1. The utility model provides a detection system of cylinder electricity core closing gap which characterized in that includes:
one or more gap detection stations;
the support cup is arranged at the gap detection station and is provided with a containing groove for containing the cylindrical battery cell and a through hole penetrating through the bottom wall of the containing groove;
the detection mechanism is arranged at the gap detection station and is used for detecting the cover closing gap of the side face of the cylindrical battery cell;
the rotary jacking mechanism is arranged below the supporting cup and is used for jacking the cylindrical battery cell positioned in the accommodating groove;
the pressing mechanism is arranged above the supporting cup and used for pressing the cylindrical battery cell downwards, so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction, and the rotary jacking mechanism can drive the cylindrical battery cell to rotate;
The pressing mechanism comprises a third driving piece and a pressing part, the detection system further comprises an encoder arranged on the pressing part, the third driving piece is used for driving the pressing part to press the cylindrical battery cell, the cylindrical battery cell rotates to drive the pressing part and the encoder to rotate, and the rotation axes of the cylindrical battery cell, the pressing part and the encoder are the same;
the encoder outputs detection trigger signals to the detection mechanism at preset rotation angles at intervals in the process of following the rotation of the cylindrical battery cell, so as to control the detection mechanism to detect the cover closing gap of the cylindrical battery cell.
2. The system for detecting a gap between two covers of a cylindrical battery cell according to claim 1, wherein the rotary jacking mechanism comprises an elastic reset piece and a jacking piece, the jacking piece is used for being abutted to the cylindrical battery cell, and the elastic reset piece is matched with the jacking piece, so that the jacking piece can stretch and retract along the height direction of the cylindrical battery cell under the action of elastic force.
3. The detecting system for the cap closing gap of the cylindrical battery cell according to claim 2, wherein the rotary jacking mechanism further comprises a first driving member, a second driving member and a connecting portion, the connecting portion and the jacking member are slidably connected in the height direction of the cylindrical battery cell, and the elastic reset member is disposed between the connecting portion and the jacking member;
The first driving piece drives the connecting part to rotate and drives the jacking piece to rotate; the second driving piece drives the connecting part to move along the height direction of the cylindrical battery cell and drives the jacking piece to jack the cylindrical battery cell.
4. The detecting system for the cap closing gap of the cylindrical battery cell according to claim 3, wherein the lifting member comprises a lifting portion, a first rotating shaft connected with the lifting portion, and a first stop member protruding along the circumferential direction of the first rotating shaft, the connecting portion comprises a connecting shaft connected with the first driving member, a second rotating shaft connected with the connecting shaft, and a second stop member protruding along the circumferential direction of the second rotating shaft, and the elastic restoring member is disposed between the first stop member and the second stop member;
the first rotating shaft is sleeved on the second rotating shaft, or the second rotating shaft is sleeved on the first rotating shaft; one of the first rotating shaft and the second rotating shaft is provided with a sliding groove extending along the height direction of the cylindrical battery cell, the other one of the first rotating shaft and the second rotating shaft is provided with a sliding column in sliding fit with the sliding groove, and the connecting part can drive the jacking piece to rotate through the sliding column and the sliding groove in matching.
5. The system for detecting a gap between a cylindrical cell and a cover according to any one of claims 1 to 4, wherein a recess is formed at the junction between the bottom wall and the side wall of the receiving groove.
6. The system of any one of claims 1-4, further comprising a rotatable turntable, wherein the support cup is disposed on the turntable, and wherein the detection mechanism is disposed outside the turntable.
7. The utility model provides a detection method of cylinder electricity core closing gap which characterized in that is applied to the detecting system of cylinder electricity core closing gap, detecting system includes control equipment, holds in the palm cup, detection mechanism, rotatory climbing mechanism and pushing down the mechanism, the detecting method includes:
the control equipment controls the rotary jacking mechanism to jack the cylindrical battery cell positioned in the support cup by a first preset distance so as to enable the bottom of the cylindrical battery cell to be separated from the bottom wall of the support cup;
the control equipment controls the pressing mechanism to press the cylindrical battery cell so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction;
the control equipment controls the rotary jacking mechanism to jack the cylindrical battery cell to a detection position;
The control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, and controls the detection mechanism to detect a cover closing gap of the side surface of the cylindrical battery cell in the process that the cylindrical battery cell rotates relative to the detection mechanism;
wherein the pressing mechanism comprises a third driving piece and a pressing part, and the detection system further comprises an encoder arranged on the pressing part;
the control equipment controls the pressing mechanism presses down the cylindrical battery cell, so that the pressing mechanism and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction, and the control equipment comprises:
the control equipment controls the third driving piece to drive the pressing part to press the cylindrical battery cell downwards, so that the pressing part and the rotary jacking mechanism are clamped at two ends of the cylindrical battery cell along the height direction;
the control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, and in the process that the cylindrical battery cell rotates relative to the detection mechanism, the control mechanism detects the cover closing gap of the side face of the cylindrical battery cell, and the control equipment comprises:
the control equipment controls the rotary jacking mechanism to drive the cylindrical battery cell to rotate, the cylindrical battery cell drives the pressing part and the encoder to rotate through rotation, and the rotation shafts of the cylindrical battery cell, the pressing part and the encoder are the same;
The encoder outputs detection trigger signals to the detection mechanism at preset rotation angles at intervals in the process of following the rotation of the cylindrical battery cell, so as to control the detection mechanism to detect the cover closing gap of the cylindrical battery cell.
8. The method for detecting a gap between covering of a cylindrical battery cell according to claim 7, wherein the detecting mechanism comprises an image acquisition module and an image processing module;
the encoder is followed the in-process of cylinder electricity core pivoted, every interval preset rotation angle to detection mechanism output detects trigger signal, in order to control detection mechanism detects the closing cap clearance of cylinder electricity core includes:
the encoder outputs detection trigger signals to the image acquisition module at every interval of preset rotation angles in the process of following the rotation of the cylindrical battery cell so as to control the image acquisition module to acquire images of the side face of the cylindrical battery cell at intervals of the preset rotation angles, and a plurality of cover closing gap images of the cylindrical battery cell are obtained;
and the image processing module detects the cover closing gap of the side face of the cylindrical battery cell based on the plurality of cover closing gap images to obtain a detection result.
9. The method for detecting a cover closing gap of a cylindrical battery cell according to claim 8, wherein the image processing module detects a cover closing gap of a side surface of the cylindrical battery cell based on a plurality of cover closing gap images, to obtain a detection result, and the method comprises:
the image processing module detects the cover closing gap of the side face of the cylindrical battery cell according to each cover closing gap image to obtain a detection result corresponding to the cover closing gap image;
and under the condition that the detection result corresponding to each cover closing gap image represents that the cover closing gap meets the preset process requirement, determining that the cover closing gap of the cylindrical battery cell is not abnormal.
10. The method for detecting a gap between covers of a cylindrical cell according to any one of claims 7 to 9, wherein the detecting system further comprises a rotatable turntable, the cup holder is disposed on the turntable, and the detecting mechanism is disposed outside the turntable;
before the control device controls the rotary jacking mechanism to jack the cylindrical battery cell positioned in the supporting cup by a first preset distance, the detection method further comprises the following steps:
the control equipment controls the turntable to rotate so as to convey the cylindrical battery cell to a gap detection station through the support cup and enable the cylindrical battery cell to be coaxial with a rotating shaft of the rotating jacking mechanism.
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| CN219266496U (en) * | 2023-01-04 | 2023-06-27 | 深圳市中基自动化股份有限公司 | Turret type follow-up detection device for large-cylinder full-tab battery |
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| KR20110118474A (en) * | 2010-04-23 | 2011-10-31 | 국방과학연구소 | Non-destructive testing apparatus to inspect the quality of pellet for thermal battery |
| CN205655802U (en) * | 2016-05-23 | 2016-10-19 | 深圳市宽田科技有限公司 | Detect equipment in car battery cap clearance |
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| CN115615348A (en) * | 2021-07-13 | 2023-01-17 | 上海普朔自动化有限公司 | Dead-angle-free round bar appearance detection device |
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| CN117723007B (en) | 2024-06-18 |
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