CN219892356U - Full-lug cylindrical battery - Google Patents
Full-lug cylindrical battery Download PDFInfo
- Publication number
- CN219892356U CN219892356U CN202320668960.XU CN202320668960U CN219892356U CN 219892356 U CN219892356 U CN 219892356U CN 202320668960 U CN202320668960 U CN 202320668960U CN 219892356 U CN219892356 U CN 219892356U
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- China
- Prior art keywords
- welding
- tab
- current collecting
- cylindrical battery
- metal
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- 238000003466 welding Methods 0.000 claims abstract description 76
- 229910052751 metal Inorganic materials 0.000 claims abstract description 60
- 239000002184 metal Substances 0.000 claims abstract description 60
- 239000000463 material Substances 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to the technical field of batteries, and discloses a full-tab cylindrical battery, which comprises: a current collecting disc with at least one welding line and a battery core with a tab are arranged on the body; the body is provided with a contact surface for contacting with the lug, and at least one metal protrusion is convexly arranged on the contact surface at a position corresponding to the welding line; the body of the current collecting disc is arranged on the rubbing end face of the tab, and the metal protrusion is pressed and embedded in the tab; when welding energy source releases energy along the welding seam, the metal protrusion can be melted under the action of the energy until the metal protrusion is connected with the tab into a whole. Compared with the conventional mode of arranging welding points on the welding end surfaces of the current collecting plates, the metal protrusions which are embedded into the electrode lugs and are melted are additionally arranged in the embodiment of the utility model, so that the welding contact area between the current collecting plates and the electrode lugs is effectively increased, the welding tension and the stability of the internal resistance of the battery are improved, and the connection reliability between the current collecting plates and the electrode lugs is ensured.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a full-tab cylindrical battery.
Background
The lithium ion battery is widely applied to the 3C fields of mobile phones, digital cameras, PC computers and the like, is also applied to the field of electric tools, and is also an opportunity for vigorous development in the fields of electric automobiles and electric bicycles since 2011 along with the strong support of the state to new energy automobiles, and among a series of lithium ion batteries, a cylindrical aluminum-shell lithium ion battery is paid attention to due to the advantages of high energy density, good safety performance and the like.
The cylindrical battery with full electrode lugs is a common assembly mode at present, however, the difficult problem faced by the cylindrical battery with full electrode lugs is how to realize the connection between the electrode lugs and the cover plate electrode posts, for this reason, the current collecting disc becomes the key for connecting the electrode lugs of the battery and the cover plate electrode posts, and the common current collecting disc is cylindrical or square, and the assembly method comprises:
firstly, carrying out rubbing treatment on all lugs at two ends of a battery winding core to form rubbing end faces;
then the collecting disc is placed in the center of the flat end face of the lug;
then welding the current collecting disc and the battery tab into a whole by adopting a laser welding mode;
and finally, connecting the other end of the current collecting disc with the pole post of the cover plate in a welding or riveting mode, and further realizing the connection between the pole posts of the pole ears through the current collecting disc.
However, in the conventional process of welding the current collecting plate and the tab, the welding energy is applied continuously and repeatedly along the extending direction of the welding seam formed on the current collecting plate by using welding energy source, so as to realize the welding of the current collecting plate and the tab at a plurality of welding spot positions. Because the welding end face of the conventional current collecting disc is relatively flat, and the flatness of the lug rubbing end face is difficult to ensure, gaps are easily formed between partial areas of the current collecting disc and the lug rubbing end face in partial positions in the welding process, and the problems of partial area cold welding, small welding tension, unstable internal resistance of a battery and the like are caused; although the above-mentioned problems such as cold joint are improved by increasing the welding energy or area, the welding time is increased, the current collecting tray is easily welded, and the yield is low.
Disclosure of Invention
The utility model aims to provide a full-lug cylindrical battery, which solves the problem of poor welding between the traditional current collecting disc and the lug rubbing end face.
To achieve the purpose, the utility model adopts the following technical scheme:
a full tab cylindrical battery comprising: a current collecting disc with at least one welding line and a battery core with a tab are arranged on the body;
the body is provided with a contact surface for contacting with the lug, and at least one metal protrusion is convexly arranged on the contact surface at a position corresponding to the welding line;
the body of the current collecting disc is arranged on the rubbing end face of the tab, and the metal protrusion is pressed and embedded in the tab; when welding energy source releases energy along the welding seam, the metal protrusion can be melted under the action of the energy until the metal protrusion is connected with the tab into a whole.
Optionally, the body is provided with a plurality of welding seams, and the welding seams are circumferentially distributed at intervals around the center of the body.
Optionally, a plurality of metal protrusions are arranged at corresponding positions of each welding line.
Optionally, the plurality of metal protrusions disposed at corresponding positions of the same weld bead are continuously spaced apart along the length direction of the corresponding weld bead.
Optionally, the height of the metal protrusion is 1 mm-2 mm.
Optionally, the metal protrusion is integrally in a shape of a ball.
Optionally, the diameter of the metal protrusion is 0.5 mm-1 mm.
Optionally, the welding seam is straight bar, arc or circular.
Optionally, all the metal protrusions are uniformly distributed on the contact surface.
Optionally, the material of the metal protrusion is the same as the material of the body.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects:
in the embodiment of the utility model, at least one metal bulge is convexly arranged on the welding end surface of the current collecting disc, and the metal bulge is pressed and embedded in the foil of the electrode lug after the current collecting disc is placed on the rubbing end surface of the electrode lug and is used for melting in the subsequent welding procedure along the welding seam so as to enable the current collecting disc to form an embedded connection mode with the inside of the electrode lug. Compared with the conventional mode of arranging welding points on the welding end surfaces of the current collecting plates, the welding contact area between the current collecting plates and the lugs is effectively increased by the molten metal protrusions embedded into the lugs, so that the welding tension and the stability of the internal resistance of the battery are improved, and the connection reliability between the current collecting plates and the lugs is ensured.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic view of the structure of the A-side of a collecting tray according to an embodiment of the present utility model;
fig. 2 is a structural view of a B-side of the current collecting tray according to an embodiment of the present utility model;
fig. 3 is an assembly view of a current collecting disc and a tab before welding according to an embodiment of the present utility model;
fig. 4 is an assembly view of the current collecting disc and the tab after welding according to the embodiment of the present utility model.
Illustration of:
the current collecting plate 1, the body 11, the welding seam 12, the metal bulge 13 and the tab 2.
Detailed Description
In order to make the objects, features and advantages of the present utility model more comprehensible, the technical solutions in the embodiments of the present utility model are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the prior art, since the conventional current collecting disc 1 is integrally flat, the welding end face of the current collecting disc 1 is flat, and the flatness of the rubbing end face of the tab 2 is difficult to ensure, so that gaps are easily formed between the welding end face of the current collecting disc 1 and the rubbing end face of the tab 2 at partial positions in the welding process, and the problems of partial region cold welding, small welding tension, unstable internal resistance of a battery and the like are caused. In order to effectively solve the problem of poor welding, the embodiment of the utility model provides a full-tab cylindrical battery, which specifically comprises the following components:
the collecting tray 1, as shown in fig. 2, has at least one weld 12 formed on a body 11, the body 11 has a contact surface (i.e., a welding end surface of the collecting tray 1 for welding with the tab 2 as shown in fig. 2) for contacting with the tab 2, and at least one metal protrusion 13 is protruding on the contact surface at a position corresponding to the weld 12;
a battery cell having a tab 2, the tab 2 having a flattened end face for welding with the current collecting plate 1;
the body 11 of the collecting tray 1 is arranged on the rubbing end face of the tab 2, and the metal protrusion 13 is pressed into the tab 2, as shown in fig. 3; when the welding energy source releases energy along the welding seam 12, the metal protrusion 13 can be melted under the action of the energy until being connected with the tab 2 into a whole, as shown in fig. 4.
In the embodiment of the utility model, at least one metal protrusion 13 is convexly arranged on the welding end surface of the current collecting disc 1, and the metal protrusion 13 is pressed and embedded in the foil material of the tab 2 after the current collecting disc 1 is placed on the rubbing end surface of the tab 2, so as to be used for melting in the subsequent welding process along the welding line 12, thereby forming an embedded connection mode between the current collecting disc 1 and the tab 2. Compared with the conventional mode of arranging welding points on the welding end face of the current collecting disc 1, the welding contact area between the current collecting disc 1 and the electrode lug 2 is effectively increased by the molten metal protrusion 13 embedded into the electrode lug 2, so that the welding tension and the stability of the internal resistance of the battery are improved, and the connection reliability between the current collecting disc 1 and the electrode lug 2 is ensured.
In practical applications, the weld 12 may be in a straight strip shape, an arc shape, a circular shape or any other shape (in fig. 1, a straight strip design mode is adopted), and may be flexibly set according to needs, which is not limited herein.
In an alternative embodiment, referring to fig. 1, the body 11 is provided with a plurality of welding seams 12, and in order to make the heat conduction effect of the collecting tray 1 uniform, the plurality of welding seams 12 are circumferentially distributed at intervals around the center of the body 11.
Referring to fig. 2, a plurality of metal protrusions 13 are disposed at corresponding positions of each of the weld seams 12. If the metal protrusions 13 are arranged continuously, the battery cells can expand in a long-term circulation process, and the welding positions of the current collecting disc 1 and the electrode lugs 2 can be damaged due to large expansion force; therefore, in the embodiment of the utility model, the plurality of metal protrusions 13 disposed at the corresponding positions of the same welding seam 12 are continuously spaced along the length direction of the corresponding welding seam 12, so as to reduce the adverse effect of the expansion force on the welding positions of the current collecting disc 1 and the tab 2.
It should be noted that, if the height of the metal protrusion 13 is too large, the metal protrusion 13 occupies a larger internal space of the battery cell, resulting in a decrease in battery performance; if the projection height of the metal projection 13 is too small, the actual effect exerted by the metal projection 13 is not sufficiently remarkable. Therefore, it is verified by a plurality of analyses that the bump height of the metal bumps 13 can be selected to be 1mm to 2mm. Of course, the actual height of the protrusions can be flexibly adjusted according to the flatness of the rubbing end surface of the tab 2, so long as the metal protrusions 13 are embedded in the tab 2.
The metal protrusion 13 may have any structure, such as a rectangular body, a spherical body, and other irregular bodies. In order to facilitate easy press-fitting of the metal protrusion 13 into the tab 2, the metal protrusion 13 is formed in a bead shape, and the diameter of the metal protrusion 13 may be selected to be 0.5mm to 1mm.
Furthermore, all the metal protrusions 13 are uniformly distributed on the contact surface, so that stable connection between the current collecting disc 1 and the pole piece at each contact position can be ensured.
The metal protrusion 13 is made of the same material as the body 11. Generally, if the current collecting plate 1 is applied to the positive terminal, both the metal protrusion 13 and the body 11 of the current collecting plate 1 are made of metal aluminum; if the current collecting plate 1 is applied to the negative terminal, both the metal protrusion 13 and the body 11 of the current collecting plate 1 are made of metal copper.
The assembly process of the above-described full tab cylindrical battery will be described as follows:
step 1: the contact surface of the metal bulge 13 of the current collecting disc 1 contacts the rubbing end surface of the electrode lug 2 of the battery core, and is pressed and fixed, so that the contact surface of the current collecting disc 1 and the rubbing end surface of the electrode lug 2 are tightly attached, gaps are not caused by the metal bulge 13, and the metal bulge 13 of the current collecting disc 1 is embedded in the foil material of the electrode lug 2 under the action of extrusion force;
step 2: the welding of the current collecting disc 1 is completed, at the moment, the welding energy transmits heat through the welding seam 12 on the body 11 of the current collecting disc 1, the metal protrusion 13 is thermally fused in the electrode lug 2, and the welding contact area of the current collecting disc 1 and the electrode lug 2 can be effectively increased, so that the welding tension and the stability of the internal resistance of the battery are improved;
step 3: and (3) finishing the welding of the other side rubbing end surface of the tab 2 and the other current collecting disc 1 in a mode of steps 1 and 2.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A full tab cylindrical battery comprising: a current collecting disc with at least one welding line and a battery core with a tab are arranged on the body;
the body is provided with a contact surface for contacting with the lug, and at least one metal protrusion is convexly arranged on the contact surface at a position corresponding to the welding line;
the body of the current collecting disc is arranged on the rubbing end face of the tab, and the metal protrusion is pressed and embedded in the tab; when welding energy source releases energy along the welding seam, the metal protrusion can be melted under the action of the energy until the metal protrusion is connected with the tab into a whole.
2. The full tab cylindrical battery of claim 1, wherein the body is provided with a plurality of welds circumferentially spaced about a center of the body.
3. The full tab cylindrical battery of claim 1, wherein each weld has a plurality of metal protrusions disposed at corresponding locations.
4. The full tab cylindrical battery according to claim 3, wherein the plurality of metal protrusions provided at corresponding positions of the same weld are continuously spaced apart along the length direction of the corresponding weld.
5. The full tab cylindrical battery of claim 1, wherein the metal protrusion has a protrusion height of 1mm to 2mm.
6. The full tab cylindrical battery of claim 1, wherein the metal protrusion is generally bead shaped.
7. The full tab cylindrical battery of claim 6, wherein the metal protrusion has a diameter of 0.5mm to 1mm.
8. The full tab cylindrical battery of claim 1, wherein the weld is straight, arcuate or circular.
9. The full tab cylindrical battery of claim 1, wherein all of the metal protrusions are uniformly distributed on the contact surface.
10. The full tab cylindrical battery of claim 1, wherein the metal protrusion is the same material as the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320668960.XU CN219892356U (en) | 2023-03-29 | 2023-03-29 | Full-lug cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320668960.XU CN219892356U (en) | 2023-03-29 | 2023-03-29 | Full-lug cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219892356U true CN219892356U (en) | 2023-10-24 |
Family
ID=88409393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320668960.XU Active CN219892356U (en) | 2023-03-29 | 2023-03-29 | Full-lug cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219892356U (en) |
-
2023
- 2023-03-29 CN CN202320668960.XU patent/CN219892356U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |