Dedusting pressure head and channeling device

Abstract

The utility model provides a dedusting pressure head and a channeling device, the dedusting pressure head and an area to be dedusted form an airflow channel, and the airflow channel comprises an air inlet area and an air outlet area which are communicated with each other; the gas inlet area comprises a gas acceleration area, and the gas acceleration area has a gradually reduced sectional area along with extending towards the gas outlet area; the end, away from the air inlet area, of the air outlet area communicates with an external dust suction device, foreign matter entering the air outlet area from the air inlet area is removed, and the technical problem that the dust removal effect is poor can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a dust removal pressure head and rolling groove device. BACKGROUND

[0002] In the production of cylindrical battery, it is an important link to control the metal scraps, dust, lint and other foreign matters caused by machine parts and artificial factors, which is called dust removal. The rolling groove structure processing of cylindrical battery shell is one of the main sources of dust production. In order to reduce the dust production of the process, the rolling groove pressure head is often connected with the dust collection device, which can suck the flying scraps during machining, thereby reducing the foreign matters entering the cylindrical battery during processing.

[0003] At present, the cylindrical steel shell rolling groove dust removal pressure head equipped with the rolling groove device can hardly effectively remove the residual foreign matters in the cylindrical battery after opening the dust collection device. UTILITY MODEL CONTENTS

[0004] The utility model provides a dust removal pressure head and rolling groove device to improve the technical problem of poor dust removal effect.

[0005] In order to realize the above object and other related objects, the utility model provides a dust removal pressure head and rolling groove device, which forms an air flow channel with the dust removal area, and the air flow channel comprises an air inlet area and an air outlet area which are communicated with each other; the air inlet area comprises a gas acceleration zone, and the gas acceleration zone has a gradually decreasing cross-sectional area along the extension to the air outlet area; the air outlet area is connected with the dust collection device outside at one end away from the air inlet area, so as to remove the foreign matters entering the air outlet area from the air inlet area.

[0006] In the above technical solution, the gas acceleration zone is arranged in the air inlet area, and the gas acceleration zone has a gradually decreasing cross-sectional area along the extension to the air outlet area, that is, the place with larger cross-sectional area has lower gas flow rate, and the place with smaller cross-sectional area has higher gas flow rate. According to Bernoulli's principle, the place with lower gas flow rate has higher air pressure, and the place with higher gas flow rate has lower air pressure. The pressure difference between the two places can make the foreign matters in the dust removal area more easily gather in the place with smaller cross-sectional area. Therefore, the arrangement of the gas acceleration zone improves the gathering efficiency of the foreign matters. Since the smallest cross-sectional area of the gas acceleration zone is connected with the air outlet area, the foreign matters gathered near the smallest cross-sectional area of the gas acceleration zone can be directly and quickly sucked out under the action of the dust collection device, thereby improving the dust removal efficiency.

[0007] In the dust removal pressure head one example of the utility model, the dust removal pressure head includes the pressure head body, the gas outlet area is arranged in the pressure head body, the gas outlet area includes the first airflow channel and the second airflow channel, one end of the first airflow channel is communicated with the dust collection device, the other end of the first airflow channel is communicated with the second airflow channel, the side of the second airflow channel away from the first airflow channel is communicated with the gas acceleration area, the second airflow channel has gradually reducing cross section along the direction of the first airflow channel, the cross section of the second airflow channel and the first airflow channel is same.

[0008] In the above technical solution, the second airflow channel has gradually reducing cross section along the direction of the first airflow channel, until the cross section of the second airflow channel and the first airflow channel is same, on the one hand, the cross section of the second airflow channel and the gas acceleration area is maximum, which is beneficial to obtain larger dust removal area, and the gas flow rate is minimum and the gas pressure is maximum at this position, along the direction of the first airflow channel, the gas flow rate gradually increases and the gas pressure gradually decreases, until the first airflow channel has maximum gas flow rate and minimum gas pressure, which is beneficial to the dust collection device to suck out the foreign matter gathered at the position with smaller cross section of the gas acceleration area through the first airflow channel, thereby further improving the dust removal efficiency.

[0009] In the dust removal pressure head one example of the utility model, the pressure head body has a plane facing the dust removal area and being penetrated by the second airflow channel, the plane is provided with a flow guide part surrounding the second airflow channel, the outer surface of the flow guide part forms the gas acceleration area with the dust removal area, and the outer surface of the flow guide part extends from the outer periphery to the radial inner side of the pressure head body and the direction close to the dust removal area.

[0010] In the above technical solution, the cross section of the gas acceleration area gradually decreases, which is realized by arranging the annular flow guide part on the plane, and the structure is simple and the effect is obvious; further, the flow guide part is arranged around the second airflow channel, which realizes the transition from the annular and flat gas inlet area to the vertical gas outlet area, so that the gas outlet area has sufficient space for structure optimization, thereby improving the dust removal efficiency.

[0011] In the dust removal pressure head one example of the utility model, the transition part is arranged between the flow guide part and the second airflow channel, and the flow guide part, the transition part and the second airflow channel are smoothly connected.

[0012] In the above technical solution, the arrangement of the transition part and the smooth connection mode are beneficial to reduce the friction resistance of the gas flow when passing through, reduce the probability of occurrence of adverse phenomena such as turbulence and vortex, and further improve the dust removal efficiency.

[0013] In the dust removal pressure head one example of the utility model, the transition part and the second airflow channel are connected through the first transition fillet, the radius of the first transition fillet is R, the center of the first transition fillet forms a center circle with a diameter of A1, the diameter of the first airflow channel is L, and L+2R A1≤1.5L.

[0014] In the technical solution, A1 determines the size of the maximum diameter of the second air flow channel, A1>L+2R can realize the cross-section difference of the two ends of the second air flow channel to form a gas flow velocity gradient, which is beneficial to improve the dust collection efficiency, and A1≤1.5L can make the second air flow channel have a larger dust removal area and be beneficial to have a larger area for gathering foreign matters near the connection between the second air flow channel and the flow guide part, so that the dust collection device can maintain an economic level while improving the dust removal efficiency of the dust removal pressure head through the structural design.

[0015] In an example of the dust removal pressure head of the utility model, the transition part and the flow guide part are connected through a second transition round corner, the center circle formed by the center of the second transition round corner has a diameter A2, and A1≤A2≤2L.

[0016] In the technical solution, the area surrounded by the transition part and the dust removal area can be used to accommodate foreign matters gathered at the position with smaller cross-sectional area of the gas acceleration zone, the transition part limited by A1≤A2≤2L can realize the effect of accommodating more foreign matters and will not affect the dust collection effect of the second air flow channel, which is beneficial to improve the dust removal efficiency.

[0017] In an example of the dust removal pressure head of the utility model, the pressure head body includes a connection part connected with the dust collection device, and the first air flow channel penetrates the connection part, the diameter of the connection part is D, the diameter of the first air flow channel is L, and L≤0.8D.

[0018] In the technical solution, L≤0.8D is limited, which can make the wall thickness of the connection part have sufficient thickness to ensure the strength requirement of the connection part.

[0019] In an example of the dust removal pressure head of the utility model, the lower limit value of the diameter of the first air flow channel is Lmin, Lmin satisfies 4Sv / (πLmin 2 )<102m / s, S is the cross-sectional area of the pipeline of the external dust collection device, and v is the measured gas flow rate.

[0020] In the technical solution, Lmin satisfies 4Sv / (πLmin 2 )<102m / s, which can ensure that the gas flow rate in the first air flow channel is located in the incompressible interval.

[0021] In an example of the dust removal pressure head of the utility model, the dust removal is used for secondary battery rolling grooves, the secondary battery includes a shell and an electrode assembly accommodated in the shell, the shell includes a side wall, one end of the side wall is provided with an opening, the pressure head body includes a matching part matched with the opening, the matching part includes a circumferential matching surface and a stop surface capable of being pressed to the end surface of the opening, and the flow guide part faces the side of the opening of the electrode assembly.

[0022] In the technical scheme, the circumferential matching surface is used for matching with the inner part of the side wall, and can position the dust removal pressure head and the shell, and the stop face can be pressed to the end face of the opening, and is used for applying pressure on the end face of the opening by the stop face of the dust removal pressure head during the rolling process, so as to assist in completing the rolling process of the shell.

[0023] In the dust removal pressure head, the outer periphery of the pressure head body is provided with a plurality of air inlet grooves, the air inlet grooves are recessed towards the axis direction of the pressure head body, and the air inlet grooves extend to the plane along the axial direction of the pressure head body, the length of the air inlet grooves is B, the length of the matching part is C, B>C, and the air inlet grooves are recessed in the circumferential matching surface along the radial direction of the pressure head body.

[0024] In the technical scheme, the air inlet grooves are used for forming air inlets of the air inlet area, and the plurality of air inlet grooves are arranged on the outer periphery of the pressure head body, which is beneficial to improving the flow of air inlet and the uniformity of air inlet; further, the air inlet grooves extend to the plane, which can guide the gas to enter along the inner wall of the shell, is beneficial to sucking out the foreign matters located at the outermost periphery of the dust removal area, so as to prevent the dead angle of dust removal; the setting of B>C can realize that the air inlet grooves have a part exposed outside the shell for communication with the atmosphere; the setting of the air inlet grooves recessed in the circumferential matching surface makes the air inlet grooves have air inlets between the air inlet grooves and the inner wall of the shell, which is beneficial to guiding the gas to enter the dust removal area, and the above settings are all beneficial to further improving the dust removal efficiency.

[0025] In the dust removal pressure head, the outer periphery of the pressure head body is provided with a stepped structure.

[0026] In the technical scheme, the stepped structure is arranged, which provides a space for the axial movement of the pressure head body during the rolling process, so as to prevent interference with other components.

[0027] The utility model also provides a rolling device, the rolling device includes any one of the dust removal pressure head.

[0028] The dust removal pressure head is provided with a gas acceleration area in the air inlet area, the gas acceleration area has a gradually decreasing cross-sectional area along the extension to the air outlet area, the place with a larger cross-sectional area has a lower gas flow rate, and the place with a smaller cross-sectional area has a higher gas flow rate, according to Bernoulli's principle, the place with a lower gas flow rate has a higher gas pressure, and the place with a higher gas flow rate has a lower gas pressure, and the pressure difference between the two places can make the foreign matters in the dust removal area more easily converge to the place with a smaller cross-sectional area, so that the setting of the gas acceleration area improves the convergence efficiency of the foreign matters, and because the minimum cross-sectional area of the gas acceleration area is connected to the air outlet area, the foreign matters converged near the minimum cross-sectional area of the gas acceleration area can be directly and quickly sucked out under the action of the dust suction device, and the dust removal efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other embodiments can be obtained from these drawings without creative labor.

[0030] Figure 1 It is a working state structural schematic diagram of the dust removal pressure head in the first example of the dust removal pressure head of the present application.

[0031] Figure 2 It is a structural schematic diagram of the dust removal pressure head in the first example of the dust removal pressure head of the present application.

[0032] Figure 3 It is a simulation diagram of airflow gathering under the action of the dust removal pressure head in the first example of the dust removal pressure head of the present application.

[0033] Figure 4 It is a simulation diagram of foreign matter distribution before foreign matter gathering in the first example of the dust removal pressure head of the present application.

[0034] Figure 5 It is a simulation diagram of foreign matter distribution after foreign matter gathering in the first example of the dust removal pressure head of the present application.

[0035] Figure 6 It is a bottom view of the dust removal pressure head in the first example of the dust removal pressure head of the present application.

[0036] Figure 7 It is a bottom view of the dust removal pressure head in another example of the dust removal pressure head of the present application.

[0037] Figure 8 It is a bottom view of the dust removal pressure head in another example of the dust removal pressure head of the present application.

[0038] Figure 9 It is a front view of the dust removal pressure head in the first example of the dust removal pressure head of the present application.

[0039] Figure 10 It is a front view of the dust removal pressure head in another example of the dust removal pressure head of the present application.

[0040] Figure 11 It is a schematic diagram of part of the structure of the rolling groove device in the first example of the present application.

[0041] Figure 12 It is a schematic diagram of part of the structure of the rolling groove device in the first example of the present application.

[0042] Element number explanation

[0043] 100, dust removal pressure head; 110, pressure head body; 111, first air flow channel; 112, second air flow channel; 113, flat surface; 114, flow guide part; 115, transition part; 1151, first transition round corner; 1152, second transition round corner; 116, connecting part; 117, fitting part; 1171, circumferential fitting surface; 1172, stop surface; 118, air inlet groove; 119, stepped structure; 120, air inlet area; 121, air inlet; 130, air outlet area; 200, secondary battery; 210, shell; 211, side wall; 2111, rolling groove structure; 212, opening; 220, electrode assembly; 300, dust removal area; 400, lower holder; 500, hob; 600, sleeve. DETAILED DESCRIPTION

[0044] The above and other advantages and effects of the present application will become readily apparent to those of ordinary skill in the art from the following description in conjunction with the accompanying drawings. The present application can also be applied or implemented in different ways, and the details in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are used to describe specific embodiments, and are not intended to limit the scope of protection of the present application. The test methods in the following embodiments are not specified, and are generally performed under conventional conditions or under conditions recommended by the manufacturers.

[0045] When the embodiments give numerical ranges, it should be understood that, unless otherwise specified by the present application, each numerical range has two endpoints and any number between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present application are used by those skilled in the art in the prior art and the description of the present application, and any method, equipment and material of the prior art similar or equivalent to the method, equipment and material described in the embodiments of the present application can be used to realize the present application.

[0046] It should be understood that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are only for the convenience of clear description, and are not intended to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content is also regarded as the scope of the present application.

[0047] The secondary battery comprises a shell, a cover plate and a pole, the shell comprises an end wall and a side wall surrounding the end wall, one end of the side wall has an opening, an electrode assembly can be assembled into the shell via the opening of the shell, the cover plate is used for covering the opening of the shell to realize sealing, and the pole is electrically connected with the electrode assembly through the end wall to guide out the electric energy generated by the electrode assembly.

[0048] The mainstream packaging mode of the existing secondary battery is mechanical sealing, which has the advantages of mature process and equipment and fast production rhythm, and is widely applied. Specifically, a rolling groove structure recessed towards the inside of the shell is rolled on the side wall of the shell, the side of the rolling groove structure close to the electrode assembly is pressed against the edge of the current collecting member, the rolling groove structure can limit the axial displacement of the electrode assembly, the cover plate is installed on the step formed on the side of the rolling groove structure away from the electrode assembly, a sealing element is arranged between the cover plate and the shell, and the cover plate is pressed against the sealing element in a bump sealing mode at the edge of the opening, so that reliable connection is formed, the sealing of the shell is realized.

[0049] In the production of the secondary battery, controlling the metal scraps, dust, lint and other foreign matters generated by machine parts and human factors is an important link for improving product yield, which is referred to as dust removal. The rolling groove processing process of the shell of the secondary battery is one of main sources of dust production. In order to reduce the dust production of the process, the rolling groove press head is often connected with a dust suction device to suck the splashed scraps during machining, so as to reduce the foreign matters entering the inside of the cylindrical battery during the processing process. However, the inventors find that the cylindrical steel shell rolling groove dust removal press head equipped in the current rolling groove device is difficult to effectively remove the residual foreign matters in the inside of the cylindrical battery after the dust suction device is turned on.

[0050] In view of this, the utility model provides a technical scheme, a gas acceleration zone is arranged in the air inlet zone surrounded by the dust removal press head and the dust removal area, the gas acceleration zone has a gradually decreasing cross-sectional area along the extension to the air outlet zone, and the pressure difference between the two positions can make the foreign matters in the dust removal area more easily converge to the position with smaller cross-sectional area, thereby improving the convergence efficiency of the foreign matters and the dust removal efficiency.

[0051] Please refer to Figures 1 to 12 The utility model provides a dust removal press head 100 and a rolling groove device, the dust removal press head 100 and the dust removal area 300 form an air flow channel to realize the process of flowing with gas in the air flow channel and discharge the foreign matters in the dust removal area 300.

[0052] Please refer to Figure 1 And Figure 2In the dust removal pressure head 100 example of the utility model, airflow channel includes the gas inlet area 120 and the gas outlet area 130 that intercommunication, the one end of gas inlet area 120 far from the gas outlet area 130 is communicated atmosphere.Further, gas inlet area 120 includes gas acceleration zone, and gas acceleration zone has gradually decreasing cross-sectional area along with extending to gas outlet area 130, the cross-sectional shape of gas acceleration zone is not limited, and can be the circular, oval, circular ring type or other irregular shape of area gradually changing, the law of area gradually changing cross-sectional area is not limited, and can be gradually reduced along with extending to gas outlet area 130 in the process only, because the place of greater cross-sectional area has lower gas flow rate, and the place of smaller cross-sectional area has higher gas flow rate, according to Bernoulli's principle, the place of lower gas flow rate has greater air pressure, and the place of higher gas flow rate has smaller air pressure, and the pressure difference of both ends of gas acceleration zone can make the foreign matter of dust removal area more easily converge to the position of smaller cross-sectional area, so the setting of gas acceleration zone improves the convergence efficiency of foreign matter, please refer to Figure 3 , Figure 3 It is the simulation diagram of airflow gathering under the action of dust removal pressure head 100 in the embodiment, wherein the color is darker, and the corresponding airflow velocity is greater, and the corresponding foreign matter is more easily converged to the place, further, please continue to refer to Figure 4 And Figure 5 , Figure 4 It is the simulation diagram of foreign matter distribution before foreign matter convergence, Figure 5 It is the simulation diagram of foreign matter distribution after foreign matter convergence, and it can be seen that foreign matter almost all converges to the position of smaller cross-sectional area, so the setting of gas acceleration zone improves the convergence efficiency of foreign matter.

[0053] Please refer to Figure 1 In the dust removal pressure head 100 example of the utility model, the gas outlet area 130 is communicated with the gas inlet area 120, the one end of the gas outlet area 130 far from the gas inlet area 120 is communicated with the dust collection device outside, and the cross-sectional shape of the gas outlet area 130 is not limited, and can be circular, oval, circular ring type, combination of multiple shapes or other irregular shape, and all shapes that can remove foreign matter entering the gas outlet area 130 from the gas inlet area 120, in the embodiment, because the minimum cross-sectional area of gas acceleration zone is communicated with the gas outlet area 130, so under the action of the dust collection device, the foreign matter converged near the minimum cross-sectional area of gas acceleration zone can be more directly and high-speed sucked out, and then the dust removal efficiency is improved.

[0054] Please refer to Figure 1 And Figure 2In the dust removal pressure head 100 example of the utility model, the dust removal pressure head 100 includes the pressure head body 110, the shape of the pressure head body 110 is not limited, can be cylindrical, prism, disc or the combination of multiple shapes, further, the gas outlet area 130 is arranged in the pressure head body 110, the gas outlet area 130 includes the first airflow channel 111 and the second airflow channel 112, one end of the first airflow channel 111 is communicated with the dust collection device, the other end of the first airflow channel 111 is communicated with the second airflow channel 112, the shape of the first airflow channel 111 is not limited, can be circular, oval, square, polygon, the combination of multiple shapes or other irregular shapes.

[0055] Please refer to Figure 1 And Figure 2 Further, the second airflow channel 112 is communicated with the gas acceleration zone away from the side of the first airflow channel 111, the second airflow channel 112 gradually reduces the cross-sectional area along the direction of the first airflow channel 111, the cross-sectional shape of the second airflow channel 112 is not limited, can be the circular, oval, annular or other irregular shape of area gradually changing, the rule of cross-sectional area gradually changing is not limited, as long as the process of gradually reducing along the direction of the first airflow channel 111 can be realized, until the cross section of the second airflow channel 112 and the first airflow channel 111 is connected.The cross-sectional area of the second airflow channel 112 and the gas acceleration zone connection place is maximum, which is beneficial to obtain larger dust removal area, and the gas flow rate is minimum and the gas pressure is maximum at this place, the gas flow rate gradually increases and the gas pressure gradually decreases along the direction of the first airflow channel 111, until the first airflow channel 111 is maximum and minimum, which is beneficial to the foreign matter gathered in the small cross-sectional area of the gas acceleration zone under the action of the dust collection device through the first airflow channel 111, thereby further improving the dust removal efficiency.The pressure head body 110 in the embodiment is a stepped cylinder, the gas outlet area 130 penetrates along the axial direction of the pressure head body 110, the smaller diameter end of the pressure head body 110 is connected with the dust collection device, and the larger diameter end is matched with the dust removal area 300 to complete dust collection.

[0056] Please refer to Figure 1 And Figure 2In the dust removal pressure head 100 example of the utility model, the pressure head body 110 has the plane 113 which faces the dust removal area and is penetrated by the second airflow channel 112, the plane 113 is provided with the flow guide part 114 which surrounds the second airflow channel 112, the outer surface of the flow guide part 114 forms the gas acceleration area with the dust removal area 300, the outer surface of the flow guide part 114 extends from the outer periphery, and simultaneously extends to the radial inner side of the pressure head body 110 and the direction close to the dust removal area 300. In the embodiment, the distance between the outer surface of the flow guide part 114 and the dust removal area 300 is changed to change the cross-sectional area of the gas acceleration area, and the setting structure is simple and the effect is obvious; the shape of the flow guide part 114 is not limited, in some embodiments, the flow guide part 114 is a frustum structure, in another embodiment, the flow guide part 114 is a curved surface structure which is convex relative to the frustum structure, and in other embodiments, the flow guide part 114 can also be a curved surface structure which is concave relative to the frustum structure. Further, in the embodiment, the flow guide part 114 is arranged around the second airflow channel 112, which realizes the change from the annular and flat air inlet area 120 to the vertical air outlet area 130, so that the air outlet area 130 has enough space for structural optimization, thereby improving the dust collection efficiency.

[0057] Please refer to Figures 1 to 2 And Figures 6 to 8 In the dust removal pressure head 100 example of the utility model, the transition part 115 is arranged between the flow guide part 114 and the second airflow channel 112, and smooth transition is formed among the flow guide part 114, the transition part 115 and the second airflow channel 112. The arrangement of the transition part 115 and the smooth transition connection mode are beneficial to reduce the friction resistance of the airflow when passing through, reduce the probability of occurrence of adverse phenomena such as turbulent flow and vortex flow, and further improve the dust collection efficiency.

[0058] Please refer to Figure 2 In the dust removal pressure head 100 example of the utility model, the transition part 115 and the second airflow channel 112 are connected through the first transition round corner 1151, the radius of the first transition round corner 1151 is R, the center circle diameter formed by the center of the first transition round corner 1151 is A1, the diameter of the first airflow channel 111 is L, and L+2R

[0059] Please refer to Figure 2In the dust removal pressure head 100 example of the utility model, the transition part 115 and the flow guide part 114 are connected through the second transition fillet 1152, the center circle diameter formed by the center of the second transition fillet 1152 is A2, and A1≤A2≤2L. The area surrounded by the transition part 115 and the dust removal area 300 can be used to accommodate foreign matters converged at the position with smaller cross-sectional area of the gas acceleration area, and the transition part 115 limited by A1≤A2≤2L can realize the effect of accommodating more foreign matters, will not affect the dust collection effect of the second gas flow channel 112, and is beneficial to improve the dust removal efficiency. It should be noted that in some embodiments, A1=A2, which means that the transition part 115, the first transition fillet 1151 and the second transition fillet 1152 are coincided as a whole, and can also be regarded as that the flow guide part 114 and the second gas flow channel 112 are directly connected through the first transition fillet 1151, that is, there is no transition part 115.

[0060] Please refer to Figure 2 In the dust removal pressure head 100 example of the utility model, the pressure head body 110 includes a connecting part 116 connected with the dust collection device, and the first gas flow channel 111 penetrates the connecting part 116. The diameter of the connecting part 116 is D, the diameter of the first gas flow channel 111 is L, and L≤0.8D. The limitation can make the wall thickness of the connecting part 116 have sufficient thickness to ensure the strength requirement of the connecting part 116.

[0061] Please refer to Figure 2 In the dust removal pressure head 100 example of the utility model, the lower limit value of the diameter of the first gas flow channel 111 is Lmin, and Lmin satisfies 4Sv / (πLmin 2 )<102m / s. S is the cross-sectional area of the pipeline of the external dust collection device, and v is the measured gas flow rate. It should be noted that: 4Sv / (πLmin 2 ) is the gas flow velocity of the first gas flow channel 111 when the diameter is Lmin. Since the gas flow velocity exceeds 102m / s, it cannot be regarded as incompressible gas, so the limitation can ensure that the gas flow velocity in the first gas flow channel 111 is in the incompressible interval, the gas flow velocity is relatively stable, and the dust removal efficiency is further improved.

[0062] Please refer to Figure 1 and Figure 2In the dust removal pressure head 100 example of the utility model, for the dust removal of the secondary battery 200 when rolling the groove, the secondary battery 200 includes the shell 210 and the electrode assembly 220 contained in the shell 210, the shell 210 includes the side wall 211, the side wall 211 is provided with the opening 212 at one end, the pressure head body 110 includes the matching part 117 matched with the opening 212, the matching part 117 includes the circumferential matching surface 1171, the circumferential matching surface 1171 is used for matching with the inside of the side wall 211, can play the role of positioning the dust removal pressure head 100 and the shell 210, the matching part 117 also includes the end face 1172 of the stop that can be crimped in the opening 212, the end face 1172 of the stop can be crimped in the end face of the opening 212, for the rolling groove process, the dust removal pressure head 100 end face 1172 exerts pressure on the end face of the opening 212, to assist the rolling groove processing of the shell 210. The flow guide part 114 faces the side of the electrode assembly 220 facing the opening 212, can realize that the flow guide part 114 and the side of the electrode assembly 220 facing the opening 212 form a gas acceleration zone, to realize the role of improving the dust removal effect.

[0063] Please refer to the drawings Figures 1 to 2 And Figures 6 to 8 In the dust removal pressure head 100 example of the utility model, the outer periphery of the pressure head body 110 is provided with a plurality of air inlet grooves 118, the air inlet grooves 118 are used for forming the air inlet 121 of the air inlet area 120, the number of air inlet grooves 118 is not limited, can be 4, 6, 8, 9, 12 or more. Preferably, the plurality of air inlet grooves 118 is uniformly distributed on the outer periphery of the pressure head body 110 along the circumference of the pressure head body 110, in the embodiment, the plurality of air inlet grooves 118 is located on the outer periphery of the larger diameter cylinder, which is beneficial to improve the flow of air inlet and the uniformity of air inlet.

[0064] Please refer to Figure 1 Further, the air inlet grooves 118 are recessed towards the axis direction of the pressure head body 110, along the axial direction of the pressure head body 110, the air inlet grooves 118 extend to the plane 113, which can realize guiding the gas to enter along the inner wall of the shell 210, and is beneficial to sucking out the foreign matter located at the outermost periphery of the dust removal area, so as to prevent the dead angle of incomplete dust removal. Please refer to Figure 3 , Figure 3 It is the simulation diagram that the airflow is gathered under the action of the dust removal pressure head 100 in the embodiment, wherein the deeper the color is, the greater the corresponding airflow speed is, and the more the corresponding foreign matter is gathered here, the dark area at the outer periphery shown in the figure is the effect of the air inlet grooves 118, the foreign matter gathered here can be efficiently gathered to the central area under the action of the dust collection device, and finally discharged through the air outlet area 130, so as to improve the dust removal efficiency.

[0065] Please refer to Figure 1 And 2, preferably, the length of the air inlet groove 118 is B, the length of the matching part 117 is C, B>C, along the radial direction of the pressure head body 110, the air inlet groove 118 is recessed in the circumferential matching surface 1171. This setting can realize that the air inlet groove 118 has a part exposed outside the shell 210 for communication with the atmosphere, and also has an air inlet 121 between the inner wall of the shell 210, so as to guide the gas into the dust removal area 300; the above settings are all beneficial to further improve the dust removal efficiency.

[0066] Considering that the maximum wind speed provided by the dust collection device to the dust removal pressure head 100 is often different in different production lines, in order to be able to adjust the slit of the electrode assembly 220 and the shell 210 within a certain wind speed adjustment range, the width (indicated by a in the drawing), the depth (indicated by b in the drawing), and the number of the air inlet groove 118 need to be adjusted.

[0067] Please refer to Figure 6 In an example of the dust removal pressure head 100 of the utility model, the number of the air inlet groove 118 is 12, the width a of the air inlet groove 118 is 2mm, and the depth b is 2mm. The width and the depth of the groove in this embodiment are both small, so that the cross-sectional area of the air inlet 121 between the air inlet groove 118 and the shell 210 is small, a larger airflow speed can be obtained, and the dust removal efficiency of the dust removal pressure head 100 is improved within a limited wind speed adjustment range. This embodiment is suitable for the case that the wind speed of the dust collection device is limited, and is beneficial to blowing the aggregation of foreign matters with sufficient wind speed.

[0068] Please refer to Figure 7 In another example of the dust removal pressure head 100 of the utility model, the number of the air inlet groove 118 is 12, the width a of the air inlet groove 118 is 2mm, and the depth b is 4mm. The depth of the groove in this embodiment is increased compared with the previous embodiment, so that the cross-sectional area of the air inlet 121 between the air inlet groove 118 and the shell 210 is increased, a larger dust removal range can be obtained. This embodiment is suitable for the case that there is a larger wind speed, and the target of improving the dust removal efficiency is realized by increasing the dust removal range.

[0069] Please refer to Figure 8 In another example of the dust removal pressure head 100 of the utility model, the number of the air inlet groove 118 is 6, the width a of the air inlet groove 118 is 4mm, and the depth b is 4mm. The width of the groove in this embodiment is increased compared with the previous embodiment, so that the cross-sectional area of the air inlet 121 between the air inlet groove 118 and the shell 210 is further increased, a larger dust removal range can be obtained. This embodiment is suitable for the case that there is sufficient wind speed, and the target of improving the dust removal efficiency is realized by increasing the dust removal range.

[0070] Please refer to Figure 9 and Figure 10In the dust removal pressure head 100 example of the utility model, the outer periphery of the pressure head body 110 is provided with a stepped structure 119. The dust removal pressure head 100 is externally connected with a sleeve 600 at one end away from the flow guide part 114. The stepped structure 119 provides a space for the pressure head body 110 to move axially during the rolling groove processing to prevent interference with the sleeve 600. The number and size of the steps of the stepped structure 119 are not limited and can be adaptively designed according to the actual installation requirements. For example, in an embodiment, referring to Figure 9 , the stepped structure 119 is a stepped shaft including four steps; in another embodiment, referring to Figure 10 , the stepped structure 119 is a stepped shaft including two steps.

[0071] Referring to Figure 11 and Figure 12 , the utility model also provides a rolling groove device, which comprises the dust removal pressure head 100 of any one of the above. The rolling groove device further comprises a lower support 400 for supporting the secondary battery 200, a dust collection device, and a hob 500 located beside the secondary battery 200 for rolling the shell 210. The rolling groove process is as follows: the secondary battery 200 is installed between the dust removal pressure head 100 and the lower support 400 and rotates with the dust removal pressure head 100 and the lower support 400. At the same time, the hob 500 rotates at the same speed as the secondary battery 200 and contacts the outer wall of the shell 210. At the same time, the dust removal pressure head 100 applies a downward pressure to the shell 210, and the rolling groove structure 2111 is rolled out under the combined action of multiple parties. Since foreign matter is generated during the rolling groove processing, the dust removal pressure head 100 with the dust removal function provided in the embodiment is used, and the dust removal device is externally connected to the dust removal pressure head 100. The dust removal pressure head 100 has the effect of improving the dust removal efficiency, thereby improving the dust removal efficiency of the rolling groove device.

[0072] It can be understood that the components listed in the rolling groove device of the utility model do not cover all components of the rolling groove device, but only the improved part of the utility model. In fact, the welding equipment should also include necessary feeding components, discharging components, power mechanisms, downward driving mechanisms, side pressure driving mechanisms, control systems, and the like, which are not described here.

[0073] The utility model discloses dust removal pressure head sets up gas acceleration area in the air inlet area, and the gradually reduced cross section of gas acceleration area has with the extension to the air outlet area, the place of bigger cross section gas flow rate is lower, the place of smaller cross section gas flow rate is higher, according to Bernoulli's principle knows, the place of lower gas flow rate atmospheric pressure is bigger, the place of higher gas flow rate atmospheric pressure is smaller, and the pressure difference of two places can make the foreign matter of dust removal area more easily converge to the position of smaller cross section, so the setting of gas acceleration area improves the convergence efficiency of foreign matter, and because the smallest cross section of gas acceleration area is connected with the air outlet area, so under the action of dust extraction device, can more directly, high -speed foreign matter that converges in the smallest cross section of gas acceleration area is sucked out, and then improves dust removal efficiency. Therefore, the utility model effectively overcomes some practical problems in the prior art and has high utilization value and use significance. The above embodiment only illustrates the principle and effect of the utility model, and is not used for limiting the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A dust extraction pressure head characterised in that, A gas flow channel is formed with the dust removal area, and the gas flow channel comprises an air inlet area and an air outlet area which are connected to each other; wherein: The air inlet area comprises a gas acceleration zone which has a gradually decreasing cross-sectional area as it extends towards the air outlet area; The air outlet area is connected to an external dust removal device at one end away from the air inlet area, and foreign matter entering the air outlet area from the air inlet area is removed by the dust removal device.

2. The dust extraction pressure head of claim 1, wherein, The dust removal pressure head comprises a pressure head body, the air outlet area is arranged in the pressure head body, the air outlet area comprises a first gas flow channel and a second gas flow channel which are connected to each other, one end of the first gas flow channel is connected to the dust removal device, the other end of the first gas flow channel is connected to the second gas flow channel, the second gas flow channel has a gradually decreasing cross-sectional area as it extends towards the first gas flow channel, and the cross section of the connection between the second gas flow channel and the first gas flow channel is the same.

3. The dust extraction pressure head of claim 2, wherein, The pressure head body has a plane facing the dust removal area and penetrated by the second gas flow channel, a flow guide part surrounding the second gas flow channel is arranged on the plane, the outer surface of the flow guide part forms the gas acceleration zone with the dust removal area, and the outer surface of the flow guide part extends from the outer periphery towards the radial inner side of the pressure head body and towards the dust removal area.

4. The dust extraction pressure head of claim 3, wherein, A transition part is arranged between the flow guide part and the second gas flow channel, and the flow guide part, the transition part and the second gas flow channel are smoothly connected to each other.

5. The dust extraction pressure head of claim 4, wherein, The transition part and the second gas flow channel are connected by a first transition round corner, the radius of the first transition round corner is R, the center of the first transition round corner forms a center circle with a diameter of A1, and the diameter of the first gas flow channel is L, wherein, L+2R 6. The dust extraction pressure head of claim 5, wherein, The transition part and the flow guide part are connected by a second transition round corner, and the center of the second transition round corner forms a center circle with a diameter of A2, wherein A1≤A2≤1.8L.

7. The dust extraction pressure head of claim 2, wherein, The pressure head body comprises a connecting part connected to the dust removal device, the first gas flow channel penetrates the connecting part, the diameter of the connecting part is D, and the diameter of the first gas flow channel is L, wherein L≤0.8D.

8. The dust extraction pressure head of claim 7, wherein, The lower limit value of the diameter of the first airflow passage is Lmin, and Lmin satisfies 4Sv / (πLmin 2 ) < 102 m / s, where S is the cross-sectional area of a duct circumscribing the dust collection device, and v is a measured gas flow rate.

9. The dust extraction pressure head of claim 3, wherein, The dust removal device is used for dust removal during the rolling of a secondary battery, the secondary battery comprises a shell and an electrode assembly accommodated in the shell, the shell comprises a side wall, one end of the side wall is provided with an opening, the pressure head body comprises a fitting part matched with the opening, the fitting part comprises a circumferential fitting surface and a stop surface capable of being pressed against the end surface of the opening, and the flow guide part faces the side of the electrode assembly facing the opening.

10. The dust extraction pressure head of claim 9, wherein, A plurality of air inlet grooves are arranged on the outer periphery of the pressure head body, the air inlet grooves are recessed towards the axis of the pressure head body, extend along the axial direction of the pressure head body, and extend to the plane, the length of the air inlet grooves is B, the length of the fitting part is C, B>C, and the air inlet grooves are recessed in the circumferential fitting surface along the radial direction of the pressure head body.

11. The dust extraction pressure head of claim 1, wherein, The outer periphery of the pressure head body is provided with a stepped structure.

12. A grooving device, characterized in that The dust removal device comprises the dust removal pressure head according to any one of claims 1 to 11.

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