CN111299798B - Novel pole piece tab welding process - Google Patents
Novel pole piece tab welding process Download PDFInfo
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- CN111299798B CN111299798B CN202010152545.XA CN202010152545A CN111299798B CN 111299798 B CN111299798 B CN 111299798B CN 202010152545 A CN202010152545 A CN 202010152545A CN 111299798 B CN111299798 B CN 111299798B
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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
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
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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
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention belongs to the technical field of lithium batteries, and particularly relates to a novel pole piece and tab welding process, which comprises the following steps: s1, preparing pole pieces and pole lugs needing to be welded together; s2, cleaning the surfaces of the first welding surface of the pole piece metal part and the second welding surface of the pole lug metal part; s3, placing the pole piece and the pole lug into a vacuum cavity of a vacuum cold pressing tool; s4, vacuumizing the vacuum cavity and keeping for a period of time; s5, extruding the first welding surface and the second welding surface which are subjected to surface treatment together by using a cold pressing tool in the vacuum cavity; and S6, filling dry gas into the vacuum cavity to complete welding. The welding process has the characteristics of high precision, reliable welding effect, high welding consistency and the like, is favorable for solving the problems of poor consistency of welding procedures in the current industry and the like, and can improve the energy density of the cell.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a novel pole piece and pole lug welding process.
Background
Conventional lithium ion battery cells are square, and in order to improve the energy density of the battery cells, special-shaped battery cells are gradually generated on the market.
Among the prior art, mainstream pole piece welding scheme has ultrasonic welding, laser welding, wherein, ultrasonic welding mode adopts the mode that ultrasonic vibration generates heat to be in the same place pole piece and utmost point ear welding, this mode welding uniformity is lower, in-process stability is relatively poor, and it is comparatively serious to weld the butt weld seat wearing and tearing, there is failure risk such as rosin joint overwelding, and laser welding uses laser to carry out the high temperature firing to two kinds of material interlinkage departments, make and reach two kinds of material melting points, two kinds of materials link together naturally after the normal atmospheric temperature cooling, this kind of welding mode can lead to welding disintegrating slag sputtering everywhere in process of production, inside the disintegrating slag gets into electric core, can lead to the inside short circuit of electric core, there is the potential safety hazard.
In conclusion, the related art has defects and needs to be improved.
Disclosure of Invention
The invention aims to: the novel pole piece tab welding process has the advantages of being high in precision, reliable in welding effect, high in welding consistency and the like, and is beneficial to solving the problems that the welding process consistency is poor in the current industry, and meanwhile, the energy density of a battery cell can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel pole piece and tab welding process comprises the following steps:
s1, preparing pole pieces and pole lugs needing to be welded together;
s2, cleaning the surfaces of the first welding surface of the pole piece metal part and the second welding surface of the pole lug metal part;
s3, placing the pole piece and the pole lug into a vacuum cavity of a vacuum cold pressing tool;
s4, vacuumizing the vacuum cavity and keeping for a period of time;
s5, extruding the first welding surface and the second welding surface which are subjected to surface treatment together by using a cold pressing tool in the vacuum cavity;
and S6, filling dry gas into the vacuum cavity to complete welding. The welding process overcomes the defects in ultrasonic welding and laser welding, has the characteristics of high precision, reliable welding effect, high welding consistency and the like, is favorable for solving the problems of poor consistency of welding procedures in the current industry and the like, and meanwhile, the connection between the pole piece and the pole lug is compact, so that the energy density of the battery cell is improved.
As an improvement of the novel pole piece and tab welding process of the present invention, in step S1, the pole piece is sequentially subjected to batching, coating, rolling and slitting. In practical application, the pole piece finished product is subjected to pole lug welding.
As an improvement of the novel welding process of the pole piece and the tab, in the step S2, the cleaning process is at least one of laser cleaning, solvent wiping, oil removing, acid cleaning, and dehydration drying. In practical application, the cleaning treatment mode can be various, and can be flexibly set according to practical situations.
As an improvement of the novel pole piece tab welding process of the present invention, in step S2, the dressing at the pole piece welding position is cleaned by laser cleaning and/or solvent wiping. This cleaning is more effective.
As an improvement of the novel pole piece tab welding process of the present invention, in step S3, the cold pressing tool includes a telescopic device, a guide post and a pressing plate, and the pressing plate is connected to an output end of the telescopic device through the guide post. The telescopic device pushes the pressing plate to extrude the welding area of the pole lug and the pole piece through the guide post during working.
As an improvement of the novel pole piece and pole lug welding process, the pressing plate corresponds to the pole piece. The structural design is beneficial to extruding the welding area of the pole lug and the pole piece.
As an improvement of the novel pole piece and tab welding process, the telescopic device is used for providing downward pressure for the pressing plate. In practical application, the telescopic device is preferably a hydraulic cylinder, and the structural design can ensure that the force of cold-pressing welding is large enough.
As an improvement of the novel welding process of the pole piece tab of the present invention, in the step S4, the vacuum degree of the vacuum chamber is required to be 1.33 × 10-4Pa or less. This design facilitates cold pressure welding.
As an improvement of the novel pole piece and tab welding process, in the step S5, the compression ratio of the cold pressing tool to the pole piece and the tab is 50% -95%, and the welding pressure is 1-6 MPa. The process design enables the cold pressure welding to have good effect.
As an improvement of the novel welding process of the pole piece and the pole lug, the compression ratio is the ratio of the thickness of the pole piece and the pole lug after compression to the thickness of the pole piece and the pole lug before compression.
As an improvement of the novel pole piece tab welding process of the present invention, in step S6, the drying gas is argon, helium or neon. In practical applications, nitrogen can be used as the protective gas and the drying gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a pole piece according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a tab in an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a cold pressing tool in an embodiment of the invention;
FIG. 4 is a schematic structural view of a pole piece tab prior to cold pressing in an embodiment of the invention;
FIG. 5 is a schematic structural view of a pole piece tab after cold pressing in an embodiment of the invention;
wherein: 1-pole piece; 1' -a first soldering surface; 1' -dressing; 2-pole ear; 2' -a second welding face; 3-cold pressing the tooling; 31-a telescopic device; 32-guide pillars; 33-pressing plate.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 to 5, a novel pole piece and tab welding process comprises the following steps:
s1, preparing a pole piece 1 and a pole lug 2 which need to be welded together;
s2, cleaning the surfaces of the first welding surface 1 'of the metal part of the pole piece 1 and the second welding surface 2' of the metal part of the pole lug 2;
s3, placing the pole piece 1 and the pole lug 2 into a vacuum cavity of a vacuum cold pressing tool 3;
s4, vacuumizing the vacuum cavity and keeping for a period of time; in practical application, the maintenance time is preferably 8-20 s;
s5, extruding the first welding surface 1 'and the second welding surface 2' with the processed surfaces together by using a cold pressing tool 3 in a vacuum cavity; in practical application, the pole piece 1 and the pole lug 2 are placed on a workbench of a cold pressing tool 3 for cold pressing welding;
and S6, filling dry gas into the vacuum cavity to complete welding. The welding process overcomes the defects in ultrasonic welding and laser welding, has the characteristics of high precision, reliable welding effect, high welding consistency and the like, is favorable for solving the problems of poor consistency of welding procedures in the prior industry and the like, and meanwhile, the connection between the pole piece 1 and the pole lug 2 is precise, so that the energy density of a battery cell can be improved.
Preferably, in step S1, the electrode sheet 1 is subjected to batching, coating, rolling and slitting processes in sequence. In practical application, the pole lug 2 of the finished pole piece 1 is welded.
Preferably, in step S2, the cleaning process is at least one of laser cleaning, solvent wiping, degreasing, acid washing, and dehydration drying. In practical application, the cleaning treatment mode can be various, and can be flexibly set according to practical situations.
Preferably, in step S2, dressing 1 ″ at the welding site of pole piece 1 is cleaned by means of laser cleaning and/or solvent wiping. This cleaning is more effective.
Preferably, in step S3, the cold press tooling 3 includes a telescopic device 31, a guide pillar 32 and a pressing plate 33, and the pressing plate 33 is connected to the output end of the telescopic device 31 through the guide pillar 32. In operation, the telescopic device 31 pushes the pressing plate 33 to press the welding area of the pole lug 2 and the pole piece 1 through the guide post 32.
Preferably, the pressing plate 33 corresponds to the pole piece 1. The structural design is beneficial to extruding the welding area of the pole lug 2 and the pole piece 1.
Preferably, the telescopic means 31 is used to provide a downward pressure to the pressure plate 33. In practical application, the telescopic device 31 is preferably a hydraulic cylinder, and the structural design can ensure that the force of cold-pressing welding is large enough.
Preferably, in step S4, the vacuum degree of the vacuum chamber is required to be 1.33 x 10-4Pa or less. This design facilitates cold pressure welding. And in the vacuum environment, the pole piece 1 and the pole lug 2 are bonded most tightly, so that the atomic diffusion between the pole piece 1 and the pole lug 2 is facilitated and the pole piece 1 and the pole lug 2 are fused together.
Preferably, in step S5, the compression ratio of the cold pressing tool 3 to the pole piece 1 and the tab 2 is 50% to 95%, and the welding pressure is 1 to 6 MPa. The process design enables the cold pressure welding to have good effect. Under the environment, the pole piece 1 and the pole lug 2 are bonded most tightly, so that the atomic diffusion between the pole piece 1 and the pole lug 2 is facilitated and the pole piece 1 and the pole lug 2 are fused together.
Preferably, the compression ratio is the ratio of the thickness of the pole piece 1 and the pole lug 2 after compression to the thickness of the pole piece 1 and the pole lug 2 before compression.
Preferably, in step S6, the drying gas is argon, helium or neon. In practical applications, nitrogen can be used as the protective gas and the drying gas.
Example 2
The difference from example 1 is: in step S4 in the present embodiment, the vacuum chamber is evacuated and held for 10 seconds. The process design enables the best vacuum pumping effect and is beneficial to shortening the processing time.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 1 is: in the embodiment, the compression ratio of the cold pressing tool 3 to the pole piece 1 and the pole lug 2 is 75%, and the welding pressure is 3.5 MPa. Under the environment, the pole piece 1 and the pole lug 2 are bonded most tightly, so that atomic diffusion between the pole piece 1 and the pole lug 2 is facilitated and the pole piece and the pole lug are fused together, the process difficulty is low, and the processing is convenient to realize.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from example 2 is: in the embodiment, the compression ratio of the cold pressing tool 3 to the pole piece 1 and the pole lug 2 is 75%, and the welding pressure is 3.5 MPa. Under the environment, the pole piece 1 and the pole lug 2 are bonded most tightly, so that atomic diffusion between the pole piece 1 and the pole lug 2 is facilitated and the pole piece and the pole lug are fused together, the process difficulty is low, and the processing is convenient to realize.
The rest is the same as embodiment 2, and the description is omitted here.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A novel pole piece and tab welding process is characterized by comprising the following steps:
s1, preparing a pole piece (1) and a pole lug (2) which need to be welded together;
s2, cleaning the surfaces of the first welding surface (1') of the metal part of the pole piece (1) and the second welding surface (2') of the metal part of the pole lug (2);
s3, putting the pole piece (1) and the pole lug (2) into a vacuum cavity of a vacuum cold pressing tool (3);
s4, vacuumizing the vacuum cavity and keeping for a period of time;
s5, in a vacuum cavity, extruding the first welding surface (1') and the second welding surface (2') which are subjected to surface treatment together by using a cold pressing tool (3), wherein the compression ratio of the cold pressing tool (3) to the pole piece (1) and the pole lug (2) is 50% -95%, and the welding pressure is 1-6 MPa;
and S6, filling dry gas into the vacuum cavity to complete welding.
2. The novel pole piece tab welding process of claim 1, characterized in that: in the step S1, the pole piece (1) is subjected to batching, coating, rolling and slitting in sequence.
3. The novel pole piece tab welding process of claim 1, characterized in that: in step S2, the cleaning process is at least one of laser cleaning, solvent wiping, oil removal, acid cleaning, and dehydration drying.
4. The novel pole piece tab welding process of claim 1, characterized in that: in the step S2, the dressing (1 ") at the welding position of the pole piece (1) is cleaned in a laser cleaning and/or solvent wiping mode.
5. The novel pole piece tab welding process of claim 1, characterized in that: in the step S3, the cold pressing tool (3) includes a telescopic device (31), a guide post (32) and a pressing plate (33), and the pressing plate (33) is connected to an output end of the telescopic device (31) through the guide post (32); the pressing plate (33) corresponds to the pole piece (1).
6. The novel pole piece tab welding process of claim 5, wherein: the telescopic device (31) is used for providing downward pressure for the pressure plate (33).
7. The novel pole piece tab welding process of claim 1, characterized in that: in the step S4, the vacuum degree of the vacuum chamber is required to be 1.33 x 10-4Pa or less.
8. The novel pole piece tab welding process of claim 1, characterized in that: the compression ratio is the ratio of the thickness of the pole piece (1) and the pole lug (2) after compression to the thickness of the pole piece (1) and the pole lug (2) before compression.
9. The novel pole piece tab welding process of claim 1, characterized in that: in the step S6, the drying gas is argon, helium or neon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152545.XA CN111299798B (en) | 2020-03-06 | 2020-03-06 | Novel pole piece tab welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152545.XA CN111299798B (en) | 2020-03-06 | 2020-03-06 | Novel pole piece tab welding process |
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| CN111299798A CN111299798A (en) | 2020-06-19 |
| CN111299798B true CN111299798B (en) | 2022-03-11 |
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| CN114682909B (en) * | 2022-05-13 | 2022-09-09 | 北京开元新能科技有限公司 | Bipolar plate welding set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4694873B2 (en) * | 2005-04-06 | 2011-06-08 | 株式会社オーハシテクニカ | Press-fit joining method and press-fit joined parts |
| CN101315990B (en) * | 2007-05-29 | 2010-06-09 | 上海比亚迪有限公司 | Battery |
| CN101562246B (en) * | 2009-05-05 | 2011-06-22 | 深圳市吉阳自动化科技有限公司 | Device and method for welding tab on pole piece |
| CN201540913U (en) * | 2009-11-30 | 2010-08-04 | 深圳市赢合科技有限公司 | Tab welding device |
| CN101791742B (en) * | 2010-02-08 | 2012-07-25 | 深圳职业技术学院 | Cold welding machine |
| CN202695641U (en) * | 2012-07-26 | 2013-01-23 | 深圳市安一福科技有限公司 | Battery cell for lithium ion battery |
| CN203448896U (en) * | 2013-09-22 | 2014-02-26 | 山东裴森动力新能源有限公司 | Lithium battery tab welding device |
| CN204831929U (en) * | 2015-06-29 | 2015-12-02 | 宁德新能源科技有限公司 | Utmost point ear rosin joint verifying attachment |
| CN107689439B (en) * | 2017-10-11 | 2023-10-24 | 华霆（合肥）动力技术有限公司 | Welding-free battery system and assembly method |
| CN108581168B (en) * | 2018-05-09 | 2020-06-26 | 西安君信电子科技有限责任公司 | Solid welding process of heat dissipation chip |
| CN109366074B (en) * | 2018-11-30 | 2021-04-13 | 苏州宇量电池有限公司 | Be applied to lithium ion battery's battery tab welding set |
| CN209970025U (en) * | 2019-02-26 | 2020-01-21 | 浙江正泰电器股份有限公司 | False tab pressing machine |
| CN109807455A (en) * | 2019-03-12 | 2019-05-28 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of diffusion welding method of diffusion welding (DW) fixture and cupro-nickel composite sheet |
| CN210099213U (en) * | 2019-05-28 | 2020-02-21 | 惠州市元大电子科技有限公司 | Aluminum-shell battery positive and negative electrode lug synchronous welding equipment |
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