CN216502930U - Multilayer utmost point ear welded fastening device - Google Patents
Multilayer utmost point ear welded fastening device Download PDFInfo
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- CN216502930U CN216502930U CN202121634046.0U CN202121634046U CN216502930U CN 216502930 U CN216502930 U CN 216502930U CN 202121634046 U CN202121634046 U CN 202121634046U CN 216502930 U CN216502930 U CN 216502930U
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Abstract
The utility model provides a multilayer tab welding and fixing device which comprises a fixing clamp group, wherein the fixing clamp group comprises a cell clamp and a tab clamp; the battery cell and the multilayer tabs are respectively placed in the battery cell fixing groove and the tab fixing groove, a welding area is formed between the battery cell clamp and the tab clamp, a protective film is arranged in the welding area, and the protective film is tightly attached to the bottom surface of a tab welding part. The battery cell clamp and the lug clamp are arranged to fix the battery cell and the multilayer lugs respectively, and the protective film is arranged on the bottom surface of the lug welding part, so that the problems of insufficient welding or infirm welding of the lugs and the like are solved effectively.
Description
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a multi-layer tab welding and fixing device.
Background
Lithium sulphur laminate polymer battery mainly comprises positive pole piece, negative pole (metal lithium piece), diaphragm, electrolyte and plastic-aluminum membrane, and wherein positive pole, negative pole are multilayer diaphragm form pole piece, through coiling or lamination stack together, use the macromolecular material barrier film to separate between positive pole and the negative pole, avoid the short circuit, and electrolyte is full of inside pole piece and diaphragm, provides the ion transmission passageway. The aluminum-plastic film seals the positive and negative plates, the diaphragm and the electrolyte to isolate moisture in the environment. In order to be connected with the outside of the battery for charging and discharging, the positive and negative electrode plates need to be led out of the battery cell main body respectively, and normally, the metal strips of the electrode plates are transferred to metal strip tabs (soft package batteries) through ultrasonic welding.
The tab is generally divided into an aluminum tab (positive electrode), a nickel tab and a copper nickel tab (negative electrode) according to the material of the metal strip; because the lithium sulfur battery cathode adopts metal lithium as the cathode, the welding of the metal lithium soft metal and the cathode tab is difficult. At present, in a single-chip battery cell of a lithium-sulfur battery, a welding method is not adopted, but the single-chip battery cell is directly pasted, but the battery cell manufactured by the method has high internal resistance, and the battery cell is polarized by high-current charging and discharging.
CN204809297U discloses a tab fixing structure, which includes a fixing plate, a plurality of heat dissipation modules fixed on the fixing plate and contacting with the tab, and a fastener, wherein the fastener is used to fix the tab and the heat dissipation modules on the fixing plate. The lug fixing structure clamps the lug by using the heat dissipation module and fixes the heat dissipation module and the lug on the fixing part of the lug fixing plate by using the fastener, thereby replacing the common welding and fixing technology in the prior art, avoiding the damage and the insufficient welding problem of the electric core caused by overhigh temperature during welding, optimizing the use of the heat dissipation module to dissipate heat, avoiding overhigh temperature during the working of the lug, and further increasing the maximum output capacity of the electric core.
CN109860497A discloses a welding method for a multi-layer tab battery, which comprises the following steps of preheating a multi-layer tab, resistance welding the multi-layer tab, shaping the multi-layer tab: compacting multiple layers of lugs, making the surfaces of the lugs be in a flat state, carrying out plasma cleaning on the surfaces of the battery cover plate poles, and carrying out laser welding on the lug cover plates. Preheat multilayer utmost point ear, adopt resistance welding to carry out prewelding to multilayer utmost point ear, carry out the plastic to multilayer utmost point ear through electric core utmost point ear shaping device, carry out the oxide with plasma cleaning device to battery cover plate utmost point post surface, the washing of greasy dirt and metal dust etc, arrange multilayer utmost point ear in under the inclosed environment and then carry out the laser welding of multilayer utmost point ear and battery cover plate utmost point post at last, the rosin joint that appears in the ultrasonic welding wave welding utmost point ear in-process of traditional technology has been solved, utmost point ear foil material damage and welding seam intensity defect such as not high, the electrochemistry performance and the cycle life of lithium cell have been showing to have improved.
CN212858171U discloses a multilayer superposed type ultrasonic welding device for high excitation of tab, which combines a three-quarter wavelength cylindrical amplitude transformer with a frequency f equal to 20kHz with a quarter wavelength welding die head to form a full-wavelength longitudinal resonance system. The vibrating device moves up and down under the drive of the welding cylinder and completes the technical process of tab welding together with a stripper plate in the stripper device under the drive of a PLC control device. The welding device is characterized in that the electrode plate conveying plate can continuously correct and position the welding workpiece through the groove structure of the electrode plate conveying plate, and the electrode plate conveying plate sequentially increases the electrode plate welding accuracy and welding effect. The U-shaped groove and the shaping pressing plate of the stripping plate in the stripping device can simultaneously finish shaping before welding and stripping after welding of the pole piece. The utility model discloses an shown utmost point ear welding set possesses advantages such as overall structure is compact, high frequency vibration energy output is stable, multiple functional, the installation is convenient and the cost is lower, easily popularizes and implements.
The existing welding and fixing device has the problems of complex structure, complex operation and insufficient solder joint, so that the problem that the electrode lug insufficient solder joint needs to be solved at present can be solved effectively under the condition that the welding and fixing device is ensured to have a simple structure.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a multilayer tab welding and fixing device, which is characterized in that a battery core and a tab clamp are arranged to fix a battery core and a multilayer tab, and a protective film is arranged on the bottom surface of a tab welding part, so that the problems of overlarge battery internal resistance, no discharge of large current or low battery voltage caused by tab insufficient welding or unstable welding and the like are solved, and the multilayer tab welding and fixing device has the characteristics of simple structure, stable welding, simple operation and the like.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a multilayer tab welding and fixing device which comprises a fixing clamp group, wherein the fixing clamp group comprises a cell clamp and a tab clamp; the battery cell and the multilayer tabs are respectively placed in the battery cell fixing groove and the tab fixing groove, a welding area is formed between the battery cell clamp and the tab clamp, a protective film is arranged in the welding area, and the protective film is tightly attached to the bottom surface of a tab welding part.
The battery cell clamp and the lug clamp are arranged to respectively fix the battery cell and the multilayer lugs, and further, the protective film is arranged on the bottom surface of the lug welding part, so that the problems of insufficient welding or infirm welding of the lugs and the like are effectively solved, the multilayer lugs are welded together without damage, and the battery cell clamp and the lug clamp have the characteristics of simple structure, firm welding, simple operation and the like.
The material of the protective film of the present invention is not particularly limited, but may be, for example, copper foil, aluminum foil, tin foil paper, brown high-temperature glue, green glue, or digital tape.
The multilayer tab has a structure in which a plurality of tabs are stacked.
As a preferred technical solution of the present invention, the battery cell is a laminated battery cell or a wound battery cell.
As a preferred technical solution of the present invention, an isolation layer is further disposed in the welding region and on the top surface of the tab welding portion.
The isolating layer is arranged on the top surface of the lug welding part, so that when welding is carried out, a plurality of layers of lugs are prevented from being bonded to the seal head of resistance welding, the seal head is damaged, and the service life of welding equipment is effectively prolonged.
As a preferred technical solution of the present invention, the negative electrode in the battery cell is a lithium metal negative electrode.
The multilayer tab is made of lithium metal.
The utility model can weld the lithium metal cathode and the lithium metal multilayer pole ear, and effectively avoids the problem of lithium metal melting or fracture.
As a preferred technical scheme of the utility model, the isolating layer is a copper nickel-plated tab or a nickel tab.
As a preferred technical scheme of the utility model, the battery cell clamp and the tab clamp are connected through a connecting block.
The battery cell clamp, the lug clamp and the connecting block are of an integrated structure.
As a preferred technical scheme of the utility model, the connecting block is a telescopic rod, and the telescopic rod adjusts the distance between the battery cell clamp and the tab clamp.
According to the utility model, the connecting block is provided with the telescopic rod, so that the distance between the battery cell clamp and the lug clamp can be adjusted through telescopic adjustment to adapt to lugs with different sizes, and the welded battery cell can be taken out conveniently through adjustment.
As a preferred technical solution of the present invention, the side walls at two sides in the battery cell fixing groove are respectively a fixing side wall and an adjusting side wall, the adjusting side wall is movably disposed on the battery cell clamp, and the adjusting side wall movably adjusts the width of the battery cell fixing groove.
The width of the battery cell fixing groove is adjusted by arranging the adjusting side wall which can be movably adjusted, so that the battery cell fixing groove is suitable for battery cells with different sizes.
As a preferred technical solution of the present invention, the adjusting side wall is movably disposed with the cell holder through a slide rail.
As a preferred technical solution of the present invention, the slide rail is provided with engaging grooves at intervals, and the engaging grooves cooperate with the fixing nails to fix the adjusting side walls.
And the fixed side wall and the adjusting side wall are respectively provided with a taking-out groove.
The multilayer tab welding and fixing device is provided with a welding device, wherein the welding device comprises a welding head and a welding head, the welding head is connected with the welding head, and the welding head is connected with the welding head through a connecting rod and a welding rod, and the welding head is connected with the welding head through a connecting rod:
pre-welding: pre-welding a bare cell, namely pre-welding a plurality of layers of tabs (for example, metal lithium tabs with the number of layers of 1-60) together, wherein the distance between the positions of welding points of double rows of welding heads and the cell main body is 4-8 mm, and cutting off the thickness of 1-2 mm by using a cutting knife after pre-welding;
(II) welding: the battery core is placed in the battery core clamp, the multiple layers of tabs are placed in the tab clamp, the protective film is pasted on the bottom surface of a tab welding position, the isolation layer is arranged on the top surface for welding, after welding is completed, a welding area is subjected to flat pressing, burrs are eliminated and the like, and then high-temperature adhesive paper is pasted for short circuit prevention, burr prevention and the like.
In the welding process, proper equipment parameters of resistance welding equipment are adjusted, the center position of a battery core is adjusted to be flush with the horizontal height of a welding head, and welding is carried out, so that a multi-layer tab (such as a multi-layer metal lithium tab) and an isolation layer (such as a metal nickel tab) can be well welded, and the multi-layer tab is well welded with the isolation layer without damage; if the welding parameters are too large, the metal lithium and the isolating layer are over-welded, the multi-layer lug deforms due to too large pressure, lithium is fused into a whole at high pressure, lithium at the lug is broken, and the like; if the welding parameters are too small, the lithium metal and the isolating layer can be subjected to insufficient welding, and a plurality of layers of non-welded lugs exist in the multi-layer lugs.
Compared with the prior art, the utility model has the beneficial effects that:
the battery cell clamp and the lug clamp are arranged to respectively fix the battery cell and the multilayer lugs, and further, the protective film is arranged on the bottom surface of the lug welding part, so that the problems of insufficient welding or infirm welding of the lugs and the like are effectively solved, the multilayer lugs are welded together without damage, and the battery cell clamp and the lug clamp have the characteristics of simple structure, firm welding, simple operation and the like.
Drawings
Fig. 1 is a schematic structural view of a multi-layer tab welding and fixing device according to an embodiment of the present invention.
1-a battery cell clamp; 2, a tab clamp; 3-electric core; 4-multilayer tab; 5-protective film; 6-connecting block.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "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 device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the utility model provides a multilayer tab 4 welding and fixing device, as shown in fig. 1, the multilayer tab 4 welding and fixing device includes a fixing clamp group, the fixing clamp group includes a battery cell clamp 1 and a tab clamp 2, a battery cell 3 fixing groove is formed on the battery cell clamp 1, and a tab fixing groove is formed on the tab clamp 2; electric core 3 and multilayer utmost point ear 4 place respectively in 3 fixed slots of electric core and utmost point ear fixed slot, form the welding area between electric core anchor clamps 1 and the utmost point ear anchor clamps 2, be provided with protection film 5 in the welding area, protection film 5 is hugged closely and is set up in the bottom surface of utmost point ear welding position.
The battery cell clamp 1 and the tab clamp 2 are arranged to respectively fix the battery cell 3 and the multilayer tabs 4, and further, the protective film 5 is arranged on the bottom surface of the tab welding part, so that the problems of tab insufficient welding or infirm welding and the like are effectively solved, the multilayer tabs 4 are welded together without damage, and the battery cell clamp has the characteristics of simple structure, firm welding, simplicity in operation and the like.
Optionally, the material of the protective film 5 is copper foil, aluminum foil, tin foil paper, brown high-temperature glue, green glue, digital adhesive tape, or the like.
Further, the battery cell 3 is a laminated battery cell 3 or a wound battery cell 3. An isolation layer (not shown) is also arranged in the welding area and positioned on the top surface of the lug welding part, and the isolation layer is a copper nickel-plated lug or a nickel lug. The isolating layer arranged on the top surface of the lug welding part ensures that the multilayer lugs 4 are not bonded to the end socket of resistance welding during welding, thereby damaging the end socket and effectively prolonging the service life of welding equipment.
Further, the negative electrode in the battery cell 3 is a lithium metal negative electrode. The material of the multi-layer tab 4 is lithium metal. The utility model can weld the lithium metal negative electrode and the lithium metal multilayer lug 4, and effectively avoids the problem of melting or breaking of lithium metal.
Further, the cell clamp 1 and the tab clamp 2 are connected through a connecting block 6. Furthermore, the cell clamp 1, the tab clamp 2 and the connecting block 6 are of an integrated structure.
Further, the connecting block 6 is a telescopic rod, and the telescopic rod adjusts the distance between the battery cell clamp 1 and the tab clamp 2. According to the utility model, the connecting block 6 is provided with the telescopic rod, so that the distance between the battery cell clamp 1 and the tab clamp 2 can be adjusted in a telescopic manner to adapt to tabs with different sizes, and the welded battery cell 3 can be taken out conveniently through adjustment.
Further, the lateral walls of the two sides in the fixing groove of the battery cell 3 are respectively a fixing lateral wall and an adjusting lateral wall, the adjusting lateral walls are movably arranged on the battery cell clamp 1, and the width of the fixing groove of the battery cell 3 is adjusted by the adjusting lateral walls. Furthermore, the adjusting side wall is movably arranged with the cell fixture 1 through a slide rail, and the slide rail is provided with a clamping groove at intervals, and the clamping groove is matched with a fixing nail to fix the adjusting side wall. According to the utility model, the width of the fixing groove of the battery cell 3 is adjusted by arranging the adjusting side wall which can be movably adjusted, so that the battery cell fixing groove is suitable for battery cells 3 with different sizes.
Furthermore, the fixed side wall and the adjusting side wall are respectively provided with a taking-out groove, so that the battery core can be taken out conveniently.
Illustratively, a method for welding the multilayer tab 4 by using the multilayer tab 4 welding and fixing device is provided, and the method specifically comprises the following steps:
pre-welding: pre-welding a bare cell 3, namely pre-welding a plurality of layers of tabs 4 (such as metal lithium tabs with 1-60 layers), wherein the distance between the positions of welding points of double rows of welding heads and the main body of the cell 3 is 4-8 mm, and cutting off the thickness of 1-2 mm by using a cutting knife after pre-welding;
(II) welding: place electric core 3 in electric core anchor clamps 1, place multilayer utmost point ear 4 in utmost point ear anchor clamps 2 to paste in utmost point ear welding position's bottom surface and establish protection film 5, the top surface sets up the isolation layer and welds, and the back is accomplished in the welding, will weld the seal district and carry out the concora crush and eliminate burr etc. pastes high temperature adhesive tape again and prevents short circuit and burr etc..
In the welding process, proper equipment parameters of resistance welding equipment are adjusted, the central position of the battery core 3 is adjusted to be flush with the horizontal height of a welding head, and welding is carried out, so that a multilayer tab 4 (such as a multilayer metal lithium tab) and an isolation layer (such as a metal nickel tab) can be well welded, and the multilayer tabs 4 are welded with the isolation layer without damage; if the welding parameters are too large, the metal lithium and the isolating layer are over-welded, the multi-layer tab 4 deforms due to too large pressure, lithium is fused into a whole at high pressure, lithium at the tab is broken, and the like; if the welding parameters are too small, the lithium metal and the isolating layer are in insufficient welding, and several layers of non-welded lugs exist in the multi-layer lugs 4.
The battery cell clamp 1 and the tab clamp 2 are arranged to respectively fix the battery cell 3 and the multilayer tabs 4, and further, the protective film 5 is arranged on the bottom surface of the tab welding part, so that the problems of tab insufficient welding or infirm welding and the like are effectively solved, the multilayer tabs 4 are welded together without damage, and the battery cell clamp has the characteristics of simple structure, firm welding, simplicity in operation and the like.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The multi-layer tab welding and fixing device is characterized by comprising a fixing clamp group, wherein the fixing clamp group comprises a cell clamp and a tab clamp;
the battery cell and the multilayer tabs are respectively placed in the battery cell fixing groove and the tab fixing groove, a welding area is formed between the battery cell clamp and the tab clamp, a protective film is arranged in the welding area, and the protective film is tightly attached to the bottom surface of a tab welding part.
2. The multi-layer tab welding fixture of claim 1, wherein the cell is a laminated cell or a wound cell.
3. The multi-layer tab welding fixture as claimed in claim 1, wherein an isolation layer is further disposed in the welding area on the top surface of the tab welding portion.
4. The multi-layer tab welding and fixing device as claimed in claim 1, wherein the negative electrode in the battery cell is a lithium metal negative electrode;
the multilayer tab is made of lithium metal.
5. The multi-layer tab welding fixture of claim 3 wherein the isolation layer is a copper plated nickel tab or a nickel tab.
6. The multi-layer tab welding and fixing device of claim 1, wherein the cell clamp and the tab clamp are connected through a connecting block;
the battery cell clamp, the lug clamp and the connecting block are of an integrated structure.
7. The multi-layer tab welding and fixing device according to claim 6, wherein the connecting block is a telescopic rod, and the telescopic rod adjusts the distance between the battery cell clamp and the tab clamp.
8. The multi-layer tab welding and fixing device according to claim 1, wherein the side walls on two sides of the cell fixing groove are respectively a fixing side wall and an adjusting side wall, the adjusting side wall is movably disposed on the cell fixture, and the adjusting side wall is movable to adjust the width of the cell fixing groove.
9. The multi-layer tab welding and fixing device of claim 8, wherein the adjusting side wall is movably disposed with the cell clamp through a slide rail.
10. The multi-layer tab welding and fixing device as claimed in claim 9, wherein the slide rail is provided with engaging grooves at intervals, and the engaging grooves are matched with fixing nails to fix the adjusting side walls;
and the fixed side wall and the adjusting side wall are respectively provided with a taking-out groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121634046.0U CN216502930U (en) | 2021-07-19 | 2021-07-19 | Multilayer utmost point ear welded fastening device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121634046.0U CN216502930U (en) | 2021-07-19 | 2021-07-19 | Multilayer utmost point ear welded fastening device |
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| CN216502930U true CN216502930U (en) | 2022-05-13 |
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| CN202121634046.0U Active CN216502930U (en) | 2021-07-19 | 2021-07-19 | Multilayer utmost point ear welded fastening device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115041802A (en) * | 2022-05-26 | 2022-09-13 | 中航锂电（洛阳）有限公司 | Pressing module, pressing device and welding equipment |
-
2021
- 2021-07-19 CN CN202121634046.0U patent/CN216502930U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115041802A (en) * | 2022-05-26 | 2022-09-13 | 中航锂电（洛阳）有限公司 | Pressing module, pressing device and welding equipment |
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