CN114932313A - Tab welding device and method - Google Patents
Tab welding device and method Download PDFInfo
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- CN114932313A CN114932313A CN202210524837.0A CN202210524837A CN114932313A CN 114932313 A CN114932313 A CN 114932313A CN 202210524837 A CN202210524837 A CN 202210524837A CN 114932313 A CN114932313 A CN 114932313A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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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
Abstract
The application discloses a tab welding device and method. Utmost point ear welding set includes: the clamp is used for clamping the tab; the gas conveying part is arranged on the clamp and used for providing inert gas for the tab; an auxiliary heating part for heating the inert gas in the gas delivery part. The tab welding device and method provided by the application can improve the welding quality of the tab and ensure the quality of a battery.
Description
Technical Field
The application relates to the technical field of battery production, in particular to a tab welding device and method.
Background
With the development of science and technology, batteries are widely used in vehicles, electronic devices and power systems as efficient and environment-friendly new energy batteries. In the production process of the battery, the tab and the battery cover plate pole are required to be welded so as to realize the external charging and discharging of the battery. However, the tab has problems of low welding quality, high porosity, a weld line region fault, and cold cracking during welding, which affect the quality of the battery.
Disclosure of Invention
The application provides a tab welding device and method, which can improve the welding quality of tabs and ensure the quality of batteries.
In a first aspect, the present invention provides a tab welding apparatus, including: the clamp is used for clamping the lug; the gas conveying part is arranged on the clamp and used for supplying inert gas to the tab; an auxiliary heating part for heating the inert gas in the gas delivery part.
According to the technical scheme, the tab welding device can be used for welding the aluminum alloy tab and the battery cover pole. And the lug is clamped by a clamp and is welded with the pole of the battery cover. When the tab is welded, the gas conveying part conveys the inert gas heated by the auxiliary heating part to the tab. The welding method is characterized in that a welding pool (hereinafter referred to as a pool for short) generated by welding is protected on one hand under the action of high-temperature inert gas while the tab is welded, and the surface of the tab is prevented from being oxidized; on the other hand, the solidification rate of the molten pool can be reduced, so that gas in the air holes (hydrogen holes generated on the surface of the tab at high temperature) has enough time to escape, and the generation of the air holes is reduced; on the other hand, the high-temperature inert gas can act on the tab to reduce the solidification speed of the molten pool, so that the stress concentration phenomenon caused by high welding speed and high solidification speed of the molten pool is relieved, and cold cracks are prevented; in yet another aspect, slow bath solidification and uniform bath temperature enable rapid filling of the molten layer with liquid aluminum alloy to reduce the layer due to the high temperature inert gas.
In an alternative embodiment, the clamp includes a first base and a second base, the first base and the second base being disposed opposite to each other along a first direction and configured to abut against each other to clamp the tab; the first base is provided with a through groove, the through groove penetrates through the first base along the first direction and forms an auxiliary heating chamber for containing the lug, and the gas conveying part is communicated with the auxiliary heating chamber.
According to the technical scheme, the clamp comprises the first base and the second base, the first base and the second base move relatively to abut against each other to effectively clamp the lug, and the lug is guaranteed to be welded stably. Simultaneously, first base forms logical groove, and this logical groove exposes utmost point ear, is convenient for lead to the inert gas of high temperature to utmost point ear on the one hand, and on the other hand provides the place demand that satisfies utmost point ear and utmost point post welded.
In an alternative embodiment, the gas delivery portion includes an annular channel and a duct, the annular channel is formed inside the first base and surrounds the through groove, a gas outlet of the annular channel communicates with the auxiliary heating chamber, and a gas inlet of the annular channel communicates with the duct.
According to the technical scheme, the gas conveying portion comprises the annular passage and the pipeline, the pipeline conveys inert gas to the annular passage from the outside, the annular passage is annularly arranged in the auxiliary heating cavity formed by the through grooves and communicated with the through grooves, high-temperature inert gas can be fully and effectively provided for the pole lugs, and the welding quality of the pole lugs is guaranteed.
In an alternative embodiment, the gas outlet comprises a plurality of gas outlet holes, the plurality of gas outlet holes being densely distributed around the through slot.
According to the technical scheme, the plurality of the gas outlet holes which are densely distributed can uniformly and effectively provide high-temperature inert gas for the pole lugs, and the quality of pole lug welding is guaranteed.
In an alternative embodiment, the first base has a mounting passage formed therein, and the auxiliary heating part includes an electric heating member provided in the mounting passage for heating the inert gas of the annular passage.
According to the technical scheme of the embodiment of the application, the electric heating element is arranged in the installation channel formed in the first base, so that on one hand, the heating efficiency of inert gas is ensured, the heat dissipation capacity of the high-temperature inert gas generated by flowing is reduced, and the heating efficiency of the electrode lug is ensured; on the other hand, the electric heating member can be protected by the first base, the service life of the electric heating member is prolonged, and meanwhile, the electric heating member is arranged in the first base, so that the tab welding device is compact in structure.
In an alternative embodiment, the gas delivery portion further comprises a throttle valve provided in the duct for controlling the flow rate of the inert gas.
According to the technical scheme, the throttling valve is arranged, the flow of the inert gas can be controlled, and the inert gas can act on the lug at a proper flow.
In an optional embodiment, the tab welding device further includes a preheating part, which is disposed on the second base and used for heating the second base to preheat the tab.
The technical scheme of this application embodiment heats the second base through setting up the preheating part to the realization is to the preheating of utmost point ear, and the inert gas of cooperation high temperature can reduce molten bath solidification rate effectively, makes gas have sufficient time to escape in the molten bath, and can alleviate the production that rapid cooling leads to stress crack.
In an optional embodiment, the clamp further comprises an air valve assembly, and the air valve assembly is arranged between the first base and the second base and is used for controlling the first base to clamp or release the pole lug.
According to the technical scheme, the air valve assembly can control the first base and the second base to be mutually abutted or away from each other through working of the air valve assembly, so that clamping or sampling of the pole lugs is realized.
In an optional embodiment, the tab welding device further comprises a laser welding mechanism and a temperature acquisition unit; the laser welding mechanism is used for welding the lugs; the temperature acquisition unit is used for acquiring the gas temperature in the gas conveying part and generating a starting signal when the gas temperature reaches a threshold value; the laser welding mechanism is configured to weld the tab in response to the activation signal.
According to the technical scheme, the temperature acquisition unit is arranged to acquire the temperature of the inert gas, when the temperature reaches the threshold value, or when the temperature of the inert gas meets the requirement, the electrode lug is welded, and the welding quality of the electrode lug is guaranteed.
In an optional embodiment, the tab welding device further comprises a control unit, wherein the control unit is used for adjusting the welding power and the welding speed of the laser welding mechanism, so that the welding power of the laser welding mechanism is 1200W-1500W, and the welding speed is 500mm/s-600 mm/s.
In a second aspect, the present invention provides a tab welding method, including the steps of:
providing a tab welding device, wherein the tab welding device comprises a clamp, a gas conveying part and an auxiliary heating part; the clamp is used for clamping a tab; the gas conveying part is arranged on the clamp and used for providing inert gas for the pole lug; the auxiliary heating part is used for heating the inert gas in the gas conveying part;
clamping a tab, and clamping the tab on the clamp;
opening the auxiliary heating part to heat the inert gas in the gas conveying part;
providing the heated inert gas in the gas delivery section to the tab;
and welding the electrode lugs.
In an alternative embodiment, the tab welding apparatus further includes a preheating part for heating the jig to preheat the tab;
the method further comprises the following steps:
and starting the preheating part to preheat the lug.
In an optional embodiment, in the opening of the auxiliary heating part, the heating temperature of the auxiliary heating part is 120-150 ℃;
in the preheating opening part, the heating temperature of the preheating part is 120-150 ℃.
In an alternative embodiment, the tab welding device further comprises a laser welding mechanism;
and in the process of welding the electrode lug, the welding power of the laser welding mechanism is 1200W-1500W, and the welding speed is 500mm/s-600 mm/s.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a perspective view of a tab welding apparatus according to some embodiments of the present application;
fig. 2 is a front view of a tab welding apparatus according to some embodiments of the present application;
fig. 3 is a top view of a tab welding apparatus according to some embodiments of the present application;
FIG. 4 is a perspective view of a first base in some embodiments of the present application;
FIG. 5 is an enlarged view taken at A in FIG. 1;
FIG. 6 is a side view of a first base in some embodiments of the present application;
fig. 7 is a schematic flow chart of a tab welding method in some embodiments of the present application.
Icon: 100-tab welding device; 10-a clamp; 11-a first base; 110-through slots; 1100-auxiliary heat chamber; 1101-installation channels; 1102-clamping and positioning a clamping groove; 12-a second base; 20-a gas delivery section; 21-an annular channel; 210-air outlet holes; 22-a pipeline; 23-a throttle valve; 30-auxiliary heating part; 40-a preheating section; 50-a gas valve assembly; 60-a laser welding mechanism; 70-a temperature acquisition unit; 80-resistance heating control box; and 90-a control cabinet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solution in the present application will be described below with reference to the accompanying drawings.
With the development of science and technology, batteries are widely used in vehicles, electronic devices and power systems as efficient and environment-friendly new energy batteries. In the production process of the battery, the tab and the battery cover plate pole are required to be welded so as to realize external charging and discharging of the battery.
The inventors have found that when the tab is made of an aluminum alloy, particularly when a multi-layer tab (e.g., a multi-layer tab formed by stacking aluminum foils with a thickness of 12 μm) is laser welded (the tab and the terminal (interposer) are connected by laser welding), the tab has low welding quality, and has problems of high void ratio, fault in the weld line region, cold cracks, and the like. The reason for the high porosity is that the micron-sized thin-layer aluminum alloy is very susceptible to oxidation, producing a large amount of Al on the surface 2 O 3 ·H 2 O, the specific surface area of the multilayer tab is large, and a large amount of crystal water is decomposed under the action of high-temperature laser in the welding process to generate hydrogen holes; the reasons for causing the fault and the cold crack in the fusion line area are that the welding speed is high, the solidification rate of a molten pool is high, tensile stress can be generated in the welding line area in the rapid solidification process to cause the cold crack to be generated, the flowing speed of the molten pool is low under the action of high-speed welding, the solidification time is short, and the liquid-phase molten pool cannot fill the fusion layer in time to cause the fault to be generated.
In view of the above, in order to improve the welding quality of the tab, especially the multi-layer tab of the aluminum alloy, so as to ensure the quality of the battery, the inventors have conducted extensive research to provide a tab welding device 100, please refer to fig. 1-3, fig. 1 is a perspective view of the tab welding device 100 in some embodiments of the present application, fig. 2 is a front view of the tab welding device 100 in some embodiments of the present application, and fig. 3 is a top view of the tab welding device 100 in some embodiments of the present application.
The tab welding apparatus 100 includes a jig 10, a gas delivery part 20, and an auxiliary heating part 30.
The clamp 10 is used for clamping a tab. The gas delivery part 20 is provided to the jig 10 for supplying an inert gas to the tab. The supplementary heat part 30 serves to heat the inert gas in the gas delivery part 20.
The tab welding apparatus 100 is used to weld a tab to a terminal post (or to a rotor plate provided to the terminal post) on a battery cover. The clamp 10 is used for clamping the tab to ensure that the tab is welded in a stable state. The gas delivery unit 20 is provided in the jig 10, and supplies an inert gas to the tab through which the inert gas flows. The supplementary heat part 30 is a member capable of heating the inert gas flowing through the gas delivery part 20 so that the inert gas has a certain temperature. Optionally, during tab welding, an inert gas acts on the molten pool to provide energy to the molten pool and slow the solidification rate of the molten pool. The inert gas may be 99.99% pure argon.
According to the technical scheme of the embodiment of the application, the tab welding device 100 can be used for welding an aluminum alloy tab and a battery cover pole. The tab is clamped by a clamp 10 and is welded with the pole of the battery cover. In tab welding, the gas delivery unit 20 delivers the inert gas heated by the auxiliary heat unit 30 to the tabs. When the tab is welded, the tab is acted by high-temperature inert gas, so that a welding molten pool (hereinafter referred to as a molten pool for short) generated by welding is protected, and the surface of the tab is prevented from being oxidized; on the other hand, the solidification rate of the molten pool can be reduced, so that gas in air holes (hydrogen holes generated on the surface of the tab at high temperature) has enough time to escape, thereby reducing the generation of the air holes and further solving the problem of high void ratio; on the other hand, the high-temperature inert gas can act on the tab to reduce the solidification speed of the molten pool, so that the stress concentration phenomenon caused by high welding speed and high solidification speed of the molten pool is relieved, and cold cracks are prevented; in yet another aspect, slow bath solidification and uniform bath temperature enable rapid filling of the molten layer with liquid aluminum alloy to reduce the layer due to the high temperature inert gas.
According to some embodiments of the present application, please refer to fig. 2, the clamp 10 includes a first base 11 and a second base 12, the first base 11 and the second base 12 are disposed oppositely along a first direction and configured to abut against each other to clamp the tab. The first base 11 is formed with a through groove 110, the through groove 110 penetrates the first base 11 in a first direction and forms an auxiliary heat chamber 1100 for accommodating a tab, and the gas delivery part 20 communicates with the auxiliary heat chamber 1100.
The first direction is the direction that first base 11 and/or second base 12 removed, and first base 11 and/or second base 12 are through removing along first direction to mutual butt or keep away from, and then realize the clamping and the sample of utmost point ear.
The first base 11 may be an upper base, and the second base 12 may be a lower base. The through slots 110 formed in the first base 11 can expose the tab clamped by the first base 11 and the second base 12, so as to implement laser welding of the tab. The through grooves 110 form an auxiliary heat chamber 1100, and the gas delivery part 20 communicates with the auxiliary heat chamber 1100 to supply the heated inert gas to the auxiliary heat chamber 1100, so that the inert gas at a high temperature can act on the tabs when the tabs are laser welded.
According to the technical scheme of the embodiment of the application, the clamp 10 comprises the first base 11 and the second base 12, the first base 11 and the second base 12 are mutually abutted to effectively clamp the electrode lugs, and the electrode lugs are enabled to be stably welded. Meanwhile, the first base 11 forms a through groove 110, the through groove 110 exposes the tab, on one hand, high-temperature inert gas is convenient to pass through to the tab, and on the other hand, the requirement of a place for welding the tab and the tab is met.
Referring to fig. 4, according to some embodiments of the present application, fig. 4 is a perspective view of a first base 11 according to some embodiments of the present application. The gas delivery part 20 includes an annular channel 21 and a duct 22, the annular channel 21 is formed inside the first base 11 and surrounds the through groove 110, a gas outlet of the annular channel 21 communicates with the auxiliary heating chamber 1100, and a gas inlet of the annular channel 21 communicates with the duct 22.
The annular channel 21 refers to a part of the through groove 110 for inert gas flow. As shown in fig. 4, the through slot 110 is elongated, and the annular channel 21 is correspondingly elongated and annular. The annular channel 21 is formed inside the first base 11, which means that the first base 11 has a chamber therein, the chamber is disposed around the through groove 110, and the chamber is used for the circulation of the inert gas.
Inert gas enters the annular channel 21 through the pipeline 22 at the outside, is discharged into the auxiliary heat chamber 1100 from a gas outlet of the annular channel 21, and acts on a molten pool generated during tab welding.
According to the technical scheme, the gas conveying part 20 comprises the annular passage 21 and the pipeline 22, the pipeline 22 conveys inert gas to the annular passage 21 from the outside, the annular passage 21 is annularly arranged in the auxiliary heat chamber 1100 formed by the through groove 110 and communicated with the through groove 110, high-temperature inert gas can be sufficiently and effectively provided for the pole lugs, the solidification rate of a molten pool is reduced, and the welding quality of the pole lugs is guaranteed.
According to some embodiments of the present application, please refer to fig. 4 and 5, in which fig. 5 is an enlarged view of a in fig. 1. The gas outlet includes a plurality of gas outlet holes 210, and the plurality of gas outlet holes 210 are densely distributed around the through-groove 110.
The air outlet holes 210 are hole structures for communicating the annular channel 21 and the auxiliary heat chamber 1100, and the air outlet holes 210 are densely distributed around the through groove 110, which means that the air outlet holes 210 are uniformly formed on the inner wall of the through groove 110 at intervals to act on the parts of the tabs exposed by the through groove 110 in an all-around manner, so as to reduce the solidification rate of the molten pool.
According to the technical scheme of the embodiment of the application, the plurality of the gas outlet holes 210 which are densely distributed can uniformly and effectively provide high-temperature inert gas for the pole lugs, and the quality of pole lug welding is guaranteed.
Please refer to fig. 1, 3, and 4 according to some embodiments of the present application. The first base 11 is formed at an inside thereof with a mounting passage 1101, and the sub-heating part 30 includes an electric heating member provided to the mounting passage 1101 for heating the inert gas of the annular passage 21.
According to the technical scheme of the embodiment of the application, the electric heating element is arranged in the installation channel 1101 formed in the first base 11, so that on one hand, the heating efficiency of the inert gas is ensured, the heat dissipation capacity of the high-temperature inert gas generated by flowing is reduced, and the heating efficiency of the tab is ensured; on the other hand, the electric heating member can be protected by the first base 11, so that the service life of the electric heating member is prolonged, and meanwhile, the tab welding device 100 can be made compact because the electric heating member is located inside the first base 11.
According to some embodiments of the present application, as shown in fig. 1-3, the gas delivery portion 20 further comprises a throttle valve 23, the throttle valve 23 being provided in the conduit 22 for controlling the flow rate of the inert gas.
The technical scheme of this application embodiment through setting up choke valve 23, can control inert gas's flow for inert gas can act on utmost point ear with appropriate flow. For example, the flow rate of the inert gas is set to 20L/min by the throttle valve 23.
According to some embodiments of the present application, referring to fig. 1 to 3, the tab welding apparatus 100 further includes a preheating part 40, the preheating part 40 being provided at the second base 12 for heating the second base 12 to preheat the tab.
The second base 12 may be a sub-base which contacts and carries the tab. The preheating part 40 is a component provided in the second base 12, and is capable of heating the second base 12 to further preheat the tab.
Through setting up preheating part 40 and heating second base 12 to the realization is to the preheating of utmost point ear, and the inert gas of cooperation high temperature can reduce the molten bath solidification rate effectively, makes the gaseous sufficient time of molten bath escape, and can alleviate rapid cooling and lead to stress crack's production.
Alternatively, the preheating part 40 may be a heating wire.
According to some embodiments of the present application, referring to fig. 2, the fixture 10 further includes an air valve assembly 50, the air valve assembly 50 is disposed between the first base 11 and the second base 12, and is used for controlling the first base 11 to clamp or release the tab.
The valve assembly 50 is in a common configuration in the fixture 10 apparatus, for example, the valve assembly 50 may include an upstream electronic valve and a downstream electronic valve. Referring to fig. 6, fig. 6 is a side view of the first base 11 according to some embodiments of the present disclosure. The downstream electronic valve in the valve assembly 50 is disposed on the surface of the first base 11 facing the second base 12. The upstream electronic gas valve may be disposed on a surface of the second base 12 facing the first base 11. The downlink electronic air valve can control the first base 11 to downlink to clamp the tab, and the uplink electronic air valve can control the first base 11 to uplink so as to take down the tab.
According to the technical scheme of the embodiment of the application, the first base 11 and the second base 12 can be controlled to be mutually abutted or mutually separated through the working of the air valve assembly 50, so that the clamping or sampling of the pole lugs is realized.
Optionally, as shown in fig. 4, the first base 11 may be provided with a clamping and positioning slot 1102, which cooperates with the second base 12 to facilitate clamping and positioning.
According to some embodiments of the present application, referring to fig. 1 and 2, the tab welding device 100 further includes a laser welding mechanism 60 and a temperature acquisition unit 70; the laser welding mechanism 60 is used for welding the tabs; the temperature acquisition unit 70 is used for acquiring the gas temperature in the gas conveying part 20 and generating a starting signal when the gas temperature reaches a threshold value; the laser welding mechanism 60 is configured to weld the tabs in response to an activation signal.
The temperature acquisition unit 70 may be a thermocouple temperature acquisition system.
Before the laser welding mechanism 60 is operated, the auxiliary heating part 30 heats the inert gas in the gas delivery part 20, and the temperature acquisition unit 70 monitors the temperature of the inert gas and generates an activation signal when the gas temperature reaches a threshold value (e.g., 150 degrees celsius). The laser welding mechanism 60 operates in response to the activation signal.
According to the technical scheme of the embodiment of the application, the temperature acquisition unit 70 is arranged to acquire the temperature of the inert gas, when the temperature reaches the threshold value, or when the temperature of the inert gas meets the requirement, the electrode lug is welded, and the welding quality of the electrode lug is guaranteed.
Optionally, the temperature acquisition unit 70 may be further configured to acquire the temperature of the preheating part 40, and generate the start signal when both the temperature of the preheating part 40 and the gas temperature reach a threshold value (e.g., 150 degrees celsius).
According to some embodiments of the present application, the tab welding apparatus 100 further comprises a control unit for adjusting the welding power and the welding speed of the laser welding mechanism 60 such that the welding power of the laser welding mechanism 60 is 1200W-1500W and the welding speed is 500mm/s-600 mm/s.
Alternatively, the control unit may receive the activation signal generated by the temperature acquisition unit 70 to control the operation of the laser welding mechanism 60.
There is also provided, in accordance with some embodiments of the present application, a method of tab welding, the method including the steps of:
providing a tab welding device 100, wherein the tab welding device 100 comprises a clamp 10, a gas conveying part 20 and an auxiliary heating part 30; the clamp 10 is used for clamping a tab; the gas conveying part 20 is arranged on the clamp 10 and used for supplying inert gas to the pole lugs; the supplementary heat part 30 is used for heating the inert gas in the gas delivery part 20;
clamping the tab, and clamping the tab on the clamp 10;
the auxiliary heating part 30 is opened to heat the inert gas in the gas delivery part 20;
supplying the heated inert gas in the gas delivery part 20 to the tab;
and welding the electrode lugs.
According to some embodiments of the present application, the tab welding apparatus 100 further includes a preheating part 40 for heating the jig 10 to preheat the tab;
the method comprises the following steps:
the preheating unit 40 is turned on to preheat the lug.
According to some embodiments of the present application, in the opening of the auxiliary heating portion 30, the heating temperature of the auxiliary heating portion 30 is 120-;
in the starting of the preheating part 40, the heating temperature of the preheating part 40 is 120-150 ℃.
The step "start the preheating unit 40 to preheat the tab" and the step "start the auxiliary heating unit 30 to heat the inert gas in the gas delivery unit 20" may be performed simultaneously or may not be performed simultaneously, so that the step "weld the tab" may be performed before.
According to some embodiments of the present application, the tab welding device 100 further includes a laser welding mechanism 60;
in the process of welding the electrode lug, the welding power of the laser welding mechanism 60 is 1200W-1500W, and the welding speed is 500mm/s-600 mm/s.
Referring to fig. 7, fig. 7 is a schematic flow chart illustrating a tab welding method according to some embodiments of the present disclosure.
S1, providing a tab welding device 100, wherein the tab welding device 100 comprises a clamp 10, a gas conveying part 20, an auxiliary heating part 30, a preheating part 40 and a laser welding mechanism 60; the clamp 10 is used for clamping a jaw tab; the gas conveying part 20 is arranged on the clamp 10 and used for supplying inert gas to the pole lugs; the supplementary heat part 30 is used for heating the inert gas in the gas delivery part 20; the preheating part 40 is used to heat the jig 10 to preheat the lug.
S2, clamping the tab, and clamping the tab on the clamp 10;
s3.1, starting the auxiliary heating part 30, and heating the inert gas in the gas conveying part 20 at the heating temperature of 150 ℃;
s3.2, starting a preheating part 40 to preheat the lug, wherein the preheating temperature is 150 ℃;
s4, supplying the heated inert gas in the gas delivery part 20 to the tab;
s5, the laser welding mechanism 60 welds the pole lug, the welding power of the laser welding mechanism 60 is 1200W-1500W, and the welding speed is 500mm/S-600 mm/S.
According to some embodiments of the present application, the present application also provides a tab welding device 100, please refer to fig. 1-6, the tab welding device 100 includes a fixture 10, a gas delivery part 20, an auxiliary heating part 30, a preheating part 40, a laser welding mechanism 60, a temperature collection unit 70 and a control unit. Among them, the jig 10, the gas delivery part 20, the supplementary heat part 30, the preheating part 40 and the temperature collecting unit 70 are installed in the control cabinet 90. The clamp 10 comprises a first base 11 (upper base) and a second base 12 (lower base), wherein the first base 11 and the second base 12 clamp or sample the pole lugs through an uplink electronic air valve and a downlink electronic air valve. The first base 11 is formed with a through groove 110, and the through groove 110 can expose a part of the clamped tab to achieve welding and introduction of inert gas. The gas delivery portion 20 includes an annular passage 21, a conduit 22, and a throttle 23. The annular channel 21 is formed inside the first base 11 and is annularly arranged in the through groove 110, and one end of the duct 22 is communicated with the annular channel 21 for introducing the external inert gas into the through groove 110 through the annular channel 21. A throttle valve 23 is provided in the conduit 22 for controlling the flow of inert gas. The first base 11 is formed at an inside thereof with a mounting passage 1101, and the sub-heating part 30 includes an electric heating member provided to the mounting passage 1101 for heating the inert gas of the annular passage 21. The preheating part 40 is disposed on the second base 12 and used for heating the second base 12 to preheat the tabs, the preheating part 40 may be a heating resistance wire, and it may be connected to a resistance heating control box 80 on the control cabinet (the auxiliary heating part 30 may also be connected to the resistance heating control box 80) to control the heating power thereof. The temperature collecting unit 70 may collect the temperatures of the supplementary heat part 30 and the preheating part 40 and generate a start signal when the temperatures reach a threshold value. The laser welding mechanism 60 is configured to weld the tabs in response to an activation signal. The control unit is used for adjusting the welding power and the welding speed of the laser welding mechanism 60, so that the welding power of the laser welding mechanism 60 is 1200W-1500W, and the welding speed is 500mm/s-600 mm/s.
Before welding a multilayer lug (aluminum alloy multilayer lug), firstly, pre-welding the multilayer lug in a multi-micron scale by an ultrasonic pre-welding system, wherein the ultrasonic frequency is set to be 20-40kHz (preferably 20kHz), the pre-welding time is 1.5-2.5s (preferably 2s), and the ultrasonic head is selected to be flat teeth; the prewelding has the advantages that foils (a plurality of layers of tabs are formed by overlapping aluminum foils) are tightly connected, so that the instability of the welding process caused by high reflection of laser is prevented; the pre-welding can prevent a large amount of gas from being distributed among the laminas and reduce the porosity. After the pre-welding is finished, the tab is welded by the tab welding device 100, and the use method of the tab welding device 100 may be as follows:
clamping a multilayer tab component to be welded through a clamp 10, starting an auxiliary heat part 30, a preheating part 40 and a temperature acquisition unit 70, and setting the heating temperature of the auxiliary heat part 30 to be 150 ℃ and the preheating temperature of the preheating part 40 to be 150 ℃; the gas conveying part 20 is opened, inert gas is introduced to the lug, the inert gas is pure argon with the concentration of 99.99%, the flow of the inert gas is set to be 20L/min through a throttle valve 23, the welding power of the laser welding mechanism 60 is set to be 1200W-1500W through a control unit, the welding speed is set to be 500mm/s-600mm/s, the scanning path is back-and-forth filling, and the defocusing amount is set to be 0 mm; the laser welding mechanism 60 is started to weld the multilayer tabs, a laser head of the manipulator laser welding mechanism 60 moves along the welding direction, a scanning laser path is an arc-shaped filling track, gas auxiliary heating (high-temperature inert gas) and preheating of the clamp 10 (preheating of the second base 12) can reduce the solidification rate of a molten pool, so that gas in the molten pool can escape for sufficient time, and stress cracks caused by rapid cooling can be relieved; after the welding is finished, the auxiliary heating part 30 and the preheating part 40 are closed, the inert gas is closed, the ascending electronic gas valve of the clamp 10 is opened, and the workpiece is taken down to finish the welding.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (14)
1. A tab welding device, comprising:
the clamp is used for clamping the tab;
the gas conveying part is arranged on the clamp and used for providing inert gas for the tab;
an auxiliary heating part for heating the inert gas in the gas delivery part.
2. The tab welding device according to claim 1,
the clamp comprises a first base and a second base, wherein the first base and the second base are oppositely arranged along a first direction and are configured to abut against each other to clamp the tabs;
the first base is provided with a through groove, the through groove penetrates through the first base along the first direction and forms an auxiliary heating chamber for accommodating a lug, and the gas conveying part is communicated with the auxiliary heating chamber.
3. The tab welding device according to claim 2,
the gas conveying part comprises an annular channel and a pipeline, the annular channel is formed inside the first base and is arranged in the through groove in an annular mode, a gas outlet of the annular channel is communicated with the auxiliary heating cavity, and a gas inlet of the annular channel is communicated with the pipeline.
4. The tab welding device according to claim 3,
the gas outlet comprises a plurality of gas outlet holes which are densely distributed around the through groove.
5. The tab welding device according to claim 3,
the inside of first base is formed with the installation passageway, it includes electric heating element to assist hot portion, electric heating element locates the installation passageway is used for heating annular channel's inert gas.
6. The tab welding device according to claim 3,
the gas conveying part further comprises a throttle valve, and the throttle valve is arranged on the pipeline and used for controlling the flow of the inert gas.
7. The tab welding device according to claim 2,
the tab welding device further comprises a preheating part, wherein the preheating part is arranged on the second base and used for heating the second base to preheat the tabs.
8. The tab welding device according to claim 2,
the clamp further comprises an air valve assembly, and the air valve assembly is arranged between the first base and the second base and used for controlling the first base to clamp or loosen the pole lug.
9. A tab welding device as claimed in any one of claims 1 to 8,
the tab welding device also comprises a laser welding mechanism and a temperature acquisition unit;
the laser welding mechanism is used for welding the lugs;
the temperature acquisition unit is used for acquiring the gas temperature in the gas conveying part and generating a starting signal when the gas temperature reaches a threshold value;
the laser welding mechanism is configured to weld the tab in response to the activation signal.
10. The tab welding device according to claim 9,
the tab welding device further comprises a control unit, wherein the control unit is used for adjusting the welding power and the welding speed of the laser welding mechanism, so that the welding power of the laser welding mechanism is 1200-1500W, and the welding speed is 500-600 mm/s.
11. A method of tab welding, the method comprising the steps of:
providing a tab welding device, wherein the tab welding device comprises a clamp, a gas conveying part and an auxiliary heating part; the clamp is used for clamping a tab; the gas conveying part is arranged on the clamp and used for providing inert gas for the tab; the auxiliary heating part is used for heating the inert gas in the gas conveying part;
clamping a tab, and clamping the tab on the clamp;
opening the auxiliary heating part to heat the inert gas in the gas conveying part;
providing the heated inert gas in the gas delivery section to the tab;
and welding the electrode lugs.
12. The tab welding method as claimed in claim 11,
the tab welding device also comprises a preheating part which is used for heating the clamp so as to preheat the tab;
the method further comprises the following steps:
and starting the preheating part to preheat the lug.
13. The tab welding method as claimed in claim 12,
in the opening auxiliary heating part, the heating temperature of the auxiliary heating part is 120-150 ℃;
in the preheating opening part, the heating temperature of the preheating part is 120-150 ℃.
14. The tab welding method as claimed in any one of claims 11 to 13,
the tab welding device also comprises a laser welding mechanism;
and in the process of welding the pole lug, the welding power of the laser welding mechanism is 1200W-1500W, and the welding speed is 500mm/s-600 mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524837.0A CN114932313A (en) | 2022-05-13 | 2022-05-13 | Tab welding device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524837.0A CN114932313A (en) | 2022-05-13 | 2022-05-13 | Tab welding device and method |
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| CN114040828A (en) * | 2019-10-23 | 2022-02-11 | 株式会社Lg新能源 | Tight-fit jig and welding method for secondary battery tab laser welding |
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| JP2009202227A (en) * | 2008-02-29 | 2009-09-10 | Toyota Industries Corp | Laser beam welding apparatus |
| JP2016030280A (en) * | 2014-07-29 | 2016-03-07 | ｐｈｙｓｉｃａｌ ｐｈｏｔｏｎ 株式会社 | Method and apparatus for laser welding of metal foil |
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Address after: No. 2, Xinle 4th Road, Xinle Industrial City, Ma'an Town, Huicheng District, Huizhou City, Guangdong Province, 516000 Applicant after: Guangdong Shunyuan Laser Technology Co.,Ltd. Address before: No. 2, Xinle 4th Road, Xinle Industrial City, Ma'an Town, Huicheng District, Huizhou City, Guangdong Province, 516000 Applicant before: Guangdong Liyuanheng Technology Co.,Ltd. |