CN113458635A - Method for welding tab and cover plate and battery assembly - Google Patents
Method for welding tab and cover plate and battery assembly Download PDFInfo
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- CN113458635A CN113458635A CN202010246786.0A CN202010246786A CN113458635A CN 113458635 A CN113458635 A CN 113458635A CN 202010246786 A CN202010246786 A CN 202010246786A CN 113458635 A CN113458635 A CN 113458635A
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic 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
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a method for welding a tab and a cover plate and an electrode assembly, wherein the welding method comprises the following steps: carrying out ultrasonic welding on the multilayer tabs to form a welding and printing area, wherein the density of the welding and printing area is not lower than the preset density; performing laser pre-welding on the welding area of the tab and the cover plate, melting part of metal at a welding seam, and reserving welding marks at the welding area; and finally welding the welding area of the pole lug and the cover plate by laser, and connecting the pole lug and the cover plate. Therefore, the welding method can enable the tab to be directly connected with the cover plate without adding a protection plate and a transition piece, thereby reducing the weight of the battery, improving the volumetric capacity and the gravimetric capacity of the battery, reducing the cold joint risk, simultaneously optimizing the whole process flow, not having the manufacturing process of the protection plate and the process of the transition piece, simplifying the production flow and reducing the production cost of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for welding a lug and a cover plate and a battery assembly.
Background
With the development of scientific technology and the consumption of traditional energy by human beings, new energy automobiles gradually enter the lives of people with higher environmental protection performance. The power battery technology is the most important in the development of new energy automobile technology, and the battery connection technology, especially the welding technology, is the key part of the battery manufacturing technology.
In the related process, in order to weld the battery tab and the cover plate, most of the battery tab and the cover plate are in transition by using flexible connection, the battery tab needs an upper protective plate and a lower protective plate in the welding mode, so that the weight of the battery is increased, the battery space is occupied, and the protective plates need to be subjected to blunt edge treatment in order to protect the battery tab, namely the protective plates need to be folded in half, so that the manufacturing of the protective plates needs a manufacturing process, and the equipment investment and the process complexity are greatly increased.
Moreover, if flexible connection is adopted, one end of the transition piece needs to be connected with the pole core, and ultrasonic welding is used; the other end needs to be connected with a cover plate connecting sheet and is welded by laser. The process has more welding times and has a plurality of problems, such as: large risk of cold joint, large ohmic resistance, more metal chips, etc. This will lead to higher internal resistance of the battery and higher heat generation temperature during charging and discharging, and the metal debris will also have a serious impact on the safety of the battery.
Furthermore, the existence of the soft connecting sheet also encroaches on the internal space of the battery, so that the volumetric specific energy of the battery is low; and the soft connecting sheet needs to be bent, so that the production efficiency is reduced, and the equipment investment cost is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one object of the present invention is to provide a method for welding a tab and a cover plate, which simplifies the connection manner of the tab and the cover plate, and greatly reduces the equipment investment and the process complexity by directly connecting the tab and the cover plate, improves the production efficiency, and saves the production investment cost.
The invention further provides a battery pack.
The welding method of the pole lug and the cover plate comprises the following steps: carrying out ultrasonic welding on the multilayer tabs to form a welding and printing area, wherein the density of the welding and printing area is not lower than the preset density; performing laser pre-welding on the welding area of the tab and the cover plate, melting part of metal at a welding seam, and reserving welding marks at the welding area; and finally welding the welding area of the pole lug and the cover plate by laser, and connecting the pole lug and the cover plate.
Therefore, the welding method can realize the direct welding of the tab and the cover plate without using a transition piece for connection, thereby simplifying the connection mode, reducing the investment of equipment and the complexity of the process, improving the production efficiency and saving the production investment cost.
In some examples of the present invention, the pre-welding the welding mark region of the tab and the cover plate with laser to melt a portion of metal at the weld, and leaving the welding mark at the welding mark region includes: a swing pre-welding mode is adopted, the power of the swing pre-welding is 2000-4000W, and the speed is 300-600 mm/s.
In some examples of the present invention, the pre-welding the welding mark region of the tab and the cover plate with laser to melt a portion of metal at the weld, and leaving the welding mark at the welding mark region includes: the linear pre-welding mode is adopted, the power of the linear pre-welding is 2000-4000W, and the speed is 100-200 mm/s.
In some examples of the present invention, the step of ultrasonically welding the multi-layer tab to form the weld region includes: clamping two sides of the multilayer tab; and carrying out ultrasonic welding on the middle part or the end part of the multi-layer pole lug to form a welding print area.
In some examples of the present invention, the step of ultrasonically welding the middle portions of the plurality of layers of the tab to form the weld region includes: and (3) distributing the middle parts of the multiple layers of the tabs between a base and a welding head of a welding machine, wherein the tab positioned at the lowest layer is flush with the base, and then carrying out ultrasonic welding.
In some examples of the invention, the base is an electrochemically etched base and the bonding tool is an electrochemically etched bonding tool or a fine-toothed bonding tool.
In some examples of the invention, the pitch of the electrochemically etched bonding tool or the fine-toothed bonding tool does not exceed 1.0 mm.
In some examples of the invention, the pitch of the electro-chemically etched or fine-toothed bonding tool is between 0.5mm and 0.7 mm.
A battery pack according to the present invention includes: the battery comprises a lug, and the lug and the cover plate are welded and connected by adopting the welding method of the lug and the cover plate.
Therefore, a combined mode of laser pre-welding and laser final welding is adopted, a transition piece is not needed for connection, the connection mode is simplified, the investment of equipment and the complexity of the process are reduced, the production efficiency is improved, and the production investment cost is saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a battery assembly;
FIG. 2 is a schematic view of a method of welding a battery tab and cover plate;
fig. 3 is a schematic view of a method of laser pre-welding a weld-printed region of a tab and a cover plate;
fig. 4 is a schematic view of a multi-layer tab ultrasonically welded to form a weld area.
Reference numerals:
a battery assembly 100;
1, a tab; leading out a sheet 2; a cover plate 3.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The welding method of the tab 1 and the cover plate 3 according to the embodiment of the present invention, which simplifies the connection manner, reduces the equipment investment and process complexity, improves the production efficiency, and saves the production investment cost, will be described with reference to fig. 1 to 4. And the battery component manufactured by the welding method can also be widely applied to various power batteries.
As shown in fig. 2, a welding method of a tab 1 and a cap plate 3 according to an embodiment of the present invention includes the steps of:
s1, firstly, carrying out ultrasonic welding on the multilayer tab 1 to form a welding print area, wherein the density of the welding print area is not lower than the preset density.
Because gaps exist among all layers of the loose multi-layer lug 1, laser welding is difficult to realize, the multi-layer lug 1 is subjected to ultrasonic welding firstly, and after the multi-layer lug 1 is subjected to ultrasonic welding, the multi-layer lug 1 can be connected together to form a welding mark area, so that the compactness and the flatness of the lug 1 can be improved, and the lug 1 can be prevented from being cracked and wrinkled.
Further, step S1 of the welding method of the present invention does not require joint strength, which may reduce the size requirement for the insection pitch of the weld head. And step S1 of the welding method of the present invention mainly aims to weld the multiple layers of tabs 1 together to form a weld mark region, and the weld mark region formed by ultrasonic welding of the multiple layers of tabs 1 has a certain density, and the density is not lower than a preset density.
The metal sheet is taken as a standard, the density of the metal sheet is 100%, and the density of a welding area formed by the multilayer tab 1 through ultrasonic welding is greater than or equal to the preset density. Therefore, the process flow can be simplified, and the production cost can be saved. The traditional welding method is to carry out ultrasonic welding on the connecting sheet and the tab 1, the connecting sheet is a plate material, belongs to the metal category, and has 100% of density, and after the ultrasonic welding, the density of the tab 1 is generally not higher than the preset density because the connecting sheet can ensure the strength of the tab after welding. Compared with the traditional method, the welding method of the invention does not use the connecting sheet and the protecting sheets at the upper side and the lower side, thus the tab 1 can not crack after being welded.
For example, the preset density of the welding area is a, because upper and lower protection plates and transition pieces are not needed on two sides of the tab 1, the tab 1 can be welded without cracking, wrinkling or cracking, and the density of the welding area of the tab 1 is greater than or equal to the preset density a, specifically, the value range of the preset density is greater than or equal to 85% and less than 100%. Because the manufacturing process of the protective sheet and the process of the transition sheet are not needed, the production is simplified, the whole process flow is optimized, and the production cost of the battery is reduced. And the parameters of the welding machine can select the energy mode, namely, the parameters with large amplitude and small energy, so that the welding time can be reduced, and the welding crack risk can be reduced. Wherein a can be about 90%. The density of the welding area of the tab 1 is greater than or equal to the preset density value of 90%.
And S2, performing laser pre-welding on the welding mark area of the tab 1 and the cover plate 3, melting part of metal at the welding seam, and leaving welding marks at the welding mark area. Specifically, although the tab 1 is subjected to ultrasonic welding, the compactness of the tab 1 is still low compared with that of a metal sheet, and the difficulty of laser welding is still large. Especially, laser welding of a negative electrode tab made of a copper foil material is a key for restricting implementation of laser welding.
The difficulty of the laser welding of the tab 1 lies in that: the copper has high heat conductivity coefficient and low absorption rate of copper to near infrared light, and the absorption rate of copper at normal temperature is less than 4%; and after the multilayer tab 1 is subjected to ultrasonic welding, the inner part of the tab is still not compact relative to a metal sheet. Due to the two points, the problems of unstable laser welding process of the negative electrode, large welding spatter, many air holes after welding and the like are caused.
Therefore, the lead pieces 2 of the solder area and the cover plate 3 are laser pre-welded. The temperature of the welding seam can be increased firstly by the pre-welding mode, so that the temperature of the tab 1 and the lead-out piece 2 of the cover plate 3 can be changed, and the infrared absorption rate of the tab 1 and the lead-out piece 2 is improved.
And S3, carrying out laser final welding on the welding area of the tab 1 and the cover plate 3, and connecting the tab 1 and the cover plate 3.
After the tab 1 is subjected to the ultrasonic welding in the step S1 and the laser pre-welding in the step S2, the welding area is in a close fit state and has a certain density, and at this time, the step S3 may be performed to perform laser final welding on the welding area of the tab 1 and the cover plate 3, and connect the tab 1 and the cover plate 3. The tab 1 and the cover plate 3 can be welded and fixed in a laser final welding mode, so that the step of fixing the tab 1 and the cover plate 3 can be completed. Wherein, the cover plate 3 is provided with a leading-out piece 2, and the tab 1 and the leading-out piece 2 are fixed by laser welding.
Therefore, by adopting the method, the protection sheet and the transition sheet do not need to be used for connection, the whole process flow can be optimized, the structure of the battery assembly 100 can be effectively simplified, the weight of the battery assembly 100 can be reduced, the specific volumetric capacity and the specific gravimetric capacity of the battery can be improved, and meanwhile, the cold joint risk is reduced.
Specifically, step S3 requires that the cover plate 3 is first placed horizontally on a horizontal welder, and the welder fixes the position of the cover plate 3 to avoid the cover plate 3 moving during the welding process.
Secondly, the tab 1 is positioned, and the welding area is arranged above the leading-out piece 2 of the cover plate 3, namely, all the welding areas formed by ultrasonic welding in the tab 1 are arranged above the leading-out piece 2 as much as possible, so that the welding effect can be improved.
Then the welding area and the lead-out sheet 2 are pressed tightly, so that the welding area is attached to the lead-out sheet 2 as much as possible, the problems of insufficient welding and the like are reduced as much as possible, and the success rate of subsequent laser welding can be improved.
And finally, carrying out laser welding on the welding area and the lead-out sheet 2, specifically, during the laser welding, melting part of the tab 1, penetrating the tab to the cover plate 3, and solidifying the liquid metal again to form a welding seam. Thereby coupling the tab 1 and the cap plate 3 together. Wherein the laser welding head welds the welding area and the lead-out sheet 2 from top to bottom. The welding motion mode is stable and the welding effect is good.
Further, the laser final welding may be vertical welding and horizontal welding, depending on the relative positions of the jig and the welding head. In any welding mode, the welding structure of the tab 1 and the lead-out piece 2 is the same, and the connection mode is penetration welding, so the adopted welding process is in the scheme of performing laser final welding on the welding area and the lead-out piece 2 of the cover plate 3.
Optionally, the tab 1 is a copper foil or an aluminum foil, the tab 1 made of the aluminum foil is a positive electrode tab, and the tab 1 made of the copper foil is a negative electrode tab.
According to an alternative embodiment of the present invention, as shown in fig. 3, the method of step S2 includes:
before the pre-welding is started, reasonable power and speed are set for equipment, welding is carried out on the welding seam positions of the pre-welded lug 1 and the cover plate 3, a small part of metal at the welding seam position is melted, and due to the fact that the amount of the molten metal is small, the size of a molten pool is small, and large splashing cannot be generated. Because the heat input of the pre-welding is small and the heat dissipation is fast, the welding seam position is immediately solidified, and the temperature of the workpiece is always slightly lower than the melting temperature when the subsequent welding is started. The absorption of the copper in the temperature range to the near infrared light is far higher than that in the normal temperature state. In the subsequent welding process, the proper welding parameters are adopted, so that the molten pool can be kept stable continuously in the welding process, and the splashing is reduced.
According to the laser pre-welding process requirement of the step S2, as shown in FIG. 3, optionally, the laser pre-welding adopts a swing pre-welding mode, the power of the swing pre-welding is 2000-4000W, and the speed is 300-600 mm/S; optionally, the laser pre-welding adopts a linear pre-welding mode, the power of the linear pre-welding is 2000-4000W, and the speed is 100-200 mm/s.
Further, since the geometrical speed of the swing pre-welding is slower than that of the straight line pre-welding, the linear energy is larger than that of the straight line in consideration of heat dissipation.
After pre-welding, the tab 1 is not connected with the lead-out sheet 2 of the cover plate 3, but a welding mark is left on the surface of the tab 1. The tab 1 at the welding position has a certain temperature due to the heating. Immediately after the pre-welding, the laser final welding in step S3 is performed, so that the welding process is stable and the welding spatter is small.
According to an alternative embodiment of the present invention, as shown in fig. 3, step S1 includes the following steps:
and S1-1, clamping two sides of the multilayer tab 1. Specifically, the two sides of the lug 1 can be clamped by using a clamp, the clamp can clamp the multilayer loose lug 1 together, and the clamp force is controlled by the air pressure of the air cylinder, so that the lug 1 can be clamped together, and the vibrating space of the lug 1 is reserved on the other hand, and the vibration is avoided.
And S1-2, carrying out ultrasonic welding on the middle part or the end part of the multilayer tab 1 to form a welding mark area. It can be understood that, after the clamp presss from both sides tight multilayer utmost point ear 1, utmost point ear 1 can send to the welding machine, and utmost point ear 1 of lower floor flushes with the base, can guarantee that utmost point ear 1 does not shift from top to bottom in welding process to guarantee that utmost point ear 1 can not drag the fracture.
Specifically, step S1-2 further includes: the middle part of the multi-layer tab 1 is distributed between a base and a welding head of a welding machine, the tab 1 positioned at the lowermost layer is flush on the base, the base is made of electrochemical corrosion, the welding head is an electrochemical corrosion welding head or a fine-toothed welding head, and the tooth pitch of the electrochemical corrosion welding head or the fine-toothed welding head is not more than 1.0 mm.
Furthermore, the middle part of the multilayer tab 1 is subjected to ultrasonic welding, the process of forming a welding print area does not require connection strength, and the requirement on the size of the insection of the tab is reduced. Therefore, the upper welding head and the lower welding head of the welding machine are required to be electrochemical corrosion welding heads or fine-tooth-line welding heads, and the welding heads with larger tooth line sizes do not need to be selected, for example, the welding heads with the tooth pitch of 1.5mm and 2.0mm, which are commonly used in the traditional flexible connection, do not need to be selected. The tooth pitch of the selected welding heads with electrochemical corrosion or the welding heads with fine insections can be 0.5mm-0.7mm, and the base of the welding machine is a base manufactured by electrochemical corrosion. This bonding tool and base combination have reduced the insection size, carry out ultrasonic welding with multilayer utmost point ear 1, form and weld the seal region and compare in traditional flexible coupling transition piece ultrasonic bonding, form that to weld the surface in seal region and more level and more smooth.
Referring to fig. 1 and 2, a battery pack 100 according to an embodiment of the present invention includes: the battery assembly comprises a battery and a cover plate 3, wherein the battery comprises a tab 1, the cover plate 3 comprises a lead-out sheet 2, the tab 1 and the lead-out sheet 2 are sequentially arranged from top to bottom, the cover plate 3 is connected with the tab 1 in an overlapping mode on the lead-out sheet 2, the tab 1 and the cover plate 3 in the battery are welded and connected by adopting a laser pre-welding and laser final welding method, specifically, a welding print area is formed on the tab 1, and the welding print area and the lead-out sheet 2 of the cover plate 3 are connected in a laser pre-welding mode and then in a laser final welding mode. Of course, the battery assembly 100 may be welded and connected completely according to the method of the above embodiment.
The current passes through the welding seam, and the tab 1 can be a positive tab or a negative tab. The positive tab is an aluminum foil material, and the negative tab is a copper foil material. The tab 1 is of a battery cell structure, and the battery cell can be manufactured in a winding or lamination mode. The leading-out piece 2 of the cover plate 3 belongs to a part of the cover plate 3, and one end of the leading-out piece is connected with a pole of the cover plate 3. The lead tab 2 has various structures according to the structure of the battery, but the structure of the lead tab 2 is consistent with the welding structure of the tab 1, and is within the range of the welding structure of the tab 1 and the cap plate 3. For example: when the positive cover plate 3 is a smooth cover plate, the sheet is led out without a pole, and the pole ear 1 is directly welded on the cover plate 3. The welding structure of the tab 1 and the cover plate 3 is still applicable, and still belongs to the welding structure of the tab 1 and the cover plate 3.
In the description of the present invention, it is to be understood that the terms, "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method for welding a tab and a cover plate is characterized by comprising the following steps:
carrying out ultrasonic welding on the multilayer tabs to form a welding and printing area, wherein the density of the welding and printing area is not lower than the preset density;
performing laser pre-welding on the welding area of the tab and the cover plate, melting part of metal at a welding seam, and reserving welding marks at the welding area;
and finally welding the welding area of the pole lug and the cover plate by laser, and connecting the pole lug and the cover plate.
2. The method for welding the tab and the cover plate according to claim 1, wherein the step of pre-welding the weld region of the tab and the cover plate with laser to melt a portion of metal at the weld and leave the weld at the weld region comprises:
a swing pre-welding mode is adopted, the power of the swing pre-welding is 2000-4000W, and the speed is 300-600 mm/s.
3. The method for welding the tab and the cover plate according to claim 1, wherein the step of pre-welding the weld region of the tab and the cover plate with laser to melt a portion of metal at the weld and leave the weld at the weld region comprises:
the linear pre-welding mode is adopted, the power of the linear pre-welding is 2000-4000W, and the speed is 100-200 mm/s.
4. The method for welding a tab and a cover plate according to claim 1, wherein the step of ultrasonically welding the multi-layered tab to form a weld region comprises:
clamping two sides of the multilayer tab;
and carrying out ultrasonic welding on the middle part or the end part of the multi-layer pole lug to form a welding print area.
5. The method of welding a tab and a cover plate as set forth in claim 4, wherein the step of ultrasonically welding the middle portions of the plurality of layers of the tab to form a weld region comprises:
and (3) distributing the middle parts of the multiple layers of the tabs between a base and a welding head of a welding machine, wherein the tab positioned at the lowest layer is flush with the base, and then carrying out ultrasonic welding.
6. The method for welding a tab and a cover plate according to claim 5, wherein the base is an electrochemically etched base, and the bonding tool is an electrochemically etched bonding tool or a fine-toothed bonding tool.
7. The method for welding a tab and a cover plate according to claim 6, wherein the pitch of the electrochemically etched bonding tool or the fine-toothed bonding tool is not more than 1.0 mm.
8. The method for welding a tab and a cover plate according to claim 7, wherein the pitch of the electrochemically etched or fine-toothed bonding tool is between 0.5mm and 0.7 mm.
9. The method for welding the tab and the cover plate as claimed in claim 1, wherein the predetermined density is a, wherein a is greater than or equal to 85% and less than 100%.
10. A battery assembly, comprising: the battery and the cover plate, the battery comprises a tab, and the tab is welded with the cover plate by adopting the welding method of the tab and the cover plate of any one of claims 1-9.
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| CN202010246786.0A CN113458635A (en) | 2020-03-31 | 2020-03-31 | Method for welding tab and cover plate and battery assembly |
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| CN202010246786.0A CN113458635A (en) | 2020-03-31 | 2020-03-31 | Method for welding tab and cover plate and battery assembly |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535857A (en) * | 2022-03-22 | 2022-05-27 | 惠州市隆合科技有限公司 | Welding structure and welding method for foil and cover plate |
| CN114583409A (en) * | 2022-03-10 | 2022-06-03 | 上海兰钧新能源科技有限公司 | Battery transfer welding method and device |
| CN114833443A (en) * | 2022-04-12 | 2022-08-02 | 深圳市海目星激光智能装备股份有限公司 | Welding method of multilayer tab |
| WO2023071065A1 (en) * | 2021-10-29 | 2023-05-04 | 蜂巢能源科技股份有限公司 | Lithium-ion battery assembly process and lithium-ion battery |
| WO2024104140A1 (en) * | 2022-11-14 | 2024-05-23 | 宁德时代新能源科技股份有限公司 | Pole piece, battery cell, electrode assembly, battery, and electrical device |
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| CN114535857B (en) * | 2022-03-22 | 2023-12-29 | 惠州市隆合科技有限公司 | Welding structure and welding method for foil and cover plate |
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