CN220963676U - Negative electrode current collecting disc and cylindrical battery - Google Patents
Negative electrode current collecting disc and cylindrical battery Download PDFInfo
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- CN220963676U CN220963676U CN202322863208.3U CN202322863208U CN220963676U CN 220963676 U CN220963676 U CN 220963676U CN 202322863208 U CN202322863208 U CN 202322863208U CN 220963676 U CN220963676 U CN 220963676U
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- current collecting
- negative electrode
- collecting disc
- electrode current
- lug
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- 238000003466 welding Methods 0.000 claims abstract description 65
- 238000005452 bending Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 abstract description 10
- 238000004880 explosion Methods 0.000 abstract description 8
- 239000011888 foil Substances 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 2
- 238000004049 embossing Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to the technical field of lithium ion batteries, in particular to a negative electrode current collecting disc and a cylindrical battery, wherein the negative electrode current collecting disc comprises: a negative electrode current collecting plate body; the center hole is positioned at the center of the negative electrode current collecting disc body; the tab welding part is positioned on one surface of the negative electrode current collecting disc body and is fixedly connected with the tab of the battery; the shell welding part is formed by bending the edge of the negative electrode current collecting disc body in the direction away from the central hole; the lug welding part is a bulge formed in the direction deviating from the lug, and the bulge is arranged around the center of the negative electrode current collecting disc body. The negative electrode current collecting disc adopting the structure can reduce the gap between the empty foil electrode lug and the current collecting disc, increase the contact area between the current collecting disc and the electrode lug, and enable the electrode lug to be closely attached to the current collecting disc, thereby avoiding the defects of empty welding, explosion welding, virtual welding and the like in the welding process of the negative electrode current collecting disc and the electrode lug, and simultaneously improving the contact area between the electrode lug and the current collecting disc, further improving the conductivity of the battery cell electrode, and improving the performance and the multiplying power performance of the battery cell lead.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a negative electrode current collecting disc and a cylindrical battery.
Background
Because of the rapid development of lithium battery technology, large cylindrical batteries are popular in the market in the power field due to the advantages of large capacity, high energy density, high structural consistency and the like.
At present, after the electrode lugs of the conventional large cylindrical battery core are cut and shaped, the electrode lugs of the battery core and the current collecting disc are connected together through laser welding, but the requirements on the flatness of the electrode lugs are high, and the flatness of the current collecting disc is higher.
So that the process has higher requirements, and the difficulty is mainly concentrated on: 1. the lug is difficult to shape, and the flatness of the lug after shaping is not high; 2. the flatness of the collecting tray is a problem. The electrode lugs and the current collecting disc are in poor contact and cannot be tightly attached together due to the reasons, and blank welding, explosion welding and false welding occur during laser welding, so that the performance of the battery core is greatly affected.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of utility model
In view of the above-mentioned shortcomings of the prior art, the present utility model aims to provide a negative electrode current collecting disc and a cylindrical battery, which aims to solve the problems that the existing negative electrode current collecting disc and the electrode lugs are in poor contact and cannot be tightly attached together, and the performance of the battery core is affected.
The technical scheme of the utility model is as follows:
A negative current collecting plate comprising:
A negative electrode current collecting plate body;
The center hole is positioned at the center of the negative electrode current collecting disc body;
The tab welding part is positioned on one surface of the negative electrode current collecting disc body and is fixedly connected with the tab of the battery;
the shell welding part is formed by bending the edge of the negative electrode current collecting disc body in a direction away from the central hole;
The lug welding part is a bulge formed in the direction deviating from the lug, and the bulge is arranged around the center of the negative electrode current collecting disc body.
The thickness of the negative electrode current collecting disc body is 0.2mm-1.1mm.
The negative electrode current collecting disc is characterized in that an embossing structure is arranged on the surface of the negative electrode current collecting disc body.
The negative electrode current collecting plate is characterized in that a plurality of through holes are formed in the negative electrode current collecting plate body.
The depth of the bulge is 0.5-5mm.
The negative electrode current collecting disc comprises a negative electrode current collecting disc body, wherein the edge of the negative electrode current collecting disc body is bent towards the direction deviating from the lug to form a shell welding part, and the shell welding part is used for forming fixed connection with a shell of a battery.
A cylindrical battery comprises a shell, a positive electrode lug, a negative electrode lug, a pole column, a positive electrode current collecting disc and a negative electrode current collecting disc; the negative electrode tab is fixedly connected with the tab welding part of the negative electrode current collecting disc, and the shell welding part of the negative electrode current collecting disc is fixedly connected with the shell.
The diameter of the cylindrical battery is between 3cm and 10 cm.
The beneficial effects are that: the utility model provides a negative electrode current collecting disc and a cylindrical battery, wherein the negative electrode current collecting disc comprises: a negative electrode current collecting plate body; the center hole is positioned at the center of the negative electrode current collecting disc body; the tab welding part is positioned on one surface of the negative electrode current collecting disc body and is fixedly connected with the tab of the battery; the shell welding part is formed by bending the edge of the negative electrode current collecting disc body in a direction away from the central hole; the lug welding part is a bulge formed in the direction deviating from the lug, and the bulge is arranged around the center of the negative electrode current collecting disc body. The utility model takes the bulge formed in the direction away from the lug of the cathode current collecting plate body as a lug welding part, and the concave surface of the lug welding part is used for welding with the lug; the negative electrode current collecting disc adopting the structure can reduce the gap between the empty foil electrode lug and the current collecting disc, increase the contact area between the current collecting disc and the electrode lug, and enable the electrode lug to be closely attached to the current collecting disc, thereby avoiding the defects of empty welding, explosion welding, virtual welding and the like in the welding process of the negative electrode current collecting disc and the electrode lug, and simultaneously improving the contact area between the electrode lug and the current collecting disc, further improving the conductivity of the battery cell electrode and improving the performance and the multiplying power performance of the battery cell lead.
Drawings
FIG. 1 is a schematic cross-sectional view of a negative electrode current collecting plate according to the present utility model;
FIG. 2 is a schematic view of a combination of a partial core cross section and a negative current collecting plate;
Reference numerals illustrate: the negative electrode current collecting plate 100, the negative electrode current collecting plate body 10, the central hole 20, the tab welding part 30, the case welding part 40, the negative electrode tab 200, the central shaft 300 and the winding core 400.
Detailed Description
The utility model provides a cathode current collecting disc and a cylindrical battery, which are used for making the purposes, technical schemes and effects of the utility model clearer and more definite, and are further described in detail below. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the recited feature, either explicitly or implicitly.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In the process of leveling the electrode lugs, the number of layers of the large cylindrical battery core winding core is different from that of the hollow foil electrode lugs at different positions, so that the positions of the electrode lugs are not in the same plane, the conventional current collecting disc is of a planar structure, and therefore, larger gaps exist on the contact surface between the hollow foil electrode lugs and the conventional current collecting disc, and the phenomena of explosion welding, over welding, virtual welding and the like can be caused in the laser welding process of the electrode lugs and the current collecting disc.
Based on this, as shown in fig. 1, the present utility model provides a negative electrode current collecting plate 100 including:
a negative electrode current collecting plate body 10;
a center hole 20 located at the center of the anode current collecting plate body 10;
a tab welding part 30, located on one surface of the negative electrode current collecting plate body 10, for fixedly connecting with a tab of a battery;
A case welding part 40 formed by bending the edge of the anode current collecting plate body 10 away from the central hole 20;
The tab welding part 30 is a protrusion formed away from the tab direction, and the protrusion is disposed around the center of the anode current collecting disk body 10.
In the embodiment, the positive electrode current collecting disc with the structure can be better closely attached to the electrode lug, and the gap between the empty foil electrode lug and the current collecting disc is reduced, so that the contact area between the positive electrode current collecting disc and the electrode lug is increased; the electrode lugs are tightly attached to the current collecting disc, so that the defects of empty welding, explosion welding, virtual welding and the like in the manufacturing and welding process of the battery core can be reduced. In addition, the positive electrode current collecting disc with the structure can improve the contact area of the electrode lug and the current collecting disc, so that the electric conductivity of the battery cell electrode is improved, and the electric conductivity and the multiplying power of the battery cell are improved.
In some embodiments, the thickness of the anode current collecting disc body is 0.2mm-1.1mm, and the anode current collecting disc body with the thickness range has higher strength and is not easy to damage; when the thickness of the cathode current collecting disc body is smaller than 0.2mm, the current collecting disc is too thin and is easy to break down by laser welding; when the thickness is more than 1.1mm, the overall weight of the battery is increased, and the battery is not portable.
In some embodiments, the negative current collecting plate is disc-shaped in shape.
In some embodiments, the surface of the negative electrode current collecting disc body is provided with an embossing structure, and the embossing structure is formed on the surface of the negative electrode current collecting disc body through an embossing process, so that the strength of the current collecting disc can be further enhanced.
In some embodiments, the negative current collecting plate body is provided with a plurality of through holes, and the plurality of through holes are formed under the condition that the contact between the current collecting plate and the tab is not influenced, so that the weight of the current collecting plate can be reduced, and the overall weight of the battery is further reduced.
In some embodiments, the shape of the through hole includes, but is not limited to, circular, polygonal, irregular shapes.
In some embodiments, the depth of the protrusion is 0.5-5mm, and the protrusion with the depth of 0.5-5mm is the tab welding part, so that the gap between the empty foil tab and the current collecting disc can be reduced, the contact area between the current collecting disc and the tab is increased, the tab and the current collecting disc are tightly attached, and the times of occurrence of defects such as empty welding, explosion welding, virtual welding and the like in the manufacturing and welding process of the battery core are reduced.
In some embodiments, the edge of the anode current collecting disc body 10 is bent in a direction away from the tab to form the case welding part 40, and the case welding part 40 is used for forming a fixed connection with the case of the battery.
In addition, the present utility model provides a cylindrical battery, which comprises a housing (not shown), a positive electrode tab, a negative electrode tab 200, a post, a positive electrode current collecting plate and the negative electrode current collecting plate 100; the negative electrode tab 200 is fixedly connected to the tab welding portion 30 of the negative electrode current collecting plate 100, and the case welding portion 40 of the negative electrode current collecting plate 100 is fixedly connected to the case.
In this embodiment, as shown in fig. 2, the positive electrode, the separator and the negative electrode are sequentially stacked around the central axis 300 to form a winding core 400, and the two ends of the winding core respectively form a positive electrode tab and a negative electrode tab 200, and the tab welding portion 30 of the negative electrode current collecting disc 100 is fixedly connected with the negative electrode tab 200, so that the current collecting disc is better closely attached to the tab, and a gap between the empty foil tab (negative electrode tab) and the current collecting disc is reduced, so that the contact area between the negative electrode current collecting disc and the tab is increased; the electrode lugs are tightly attached to the current collecting disc, so that the defects of empty welding, explosion welding, virtual welding and the like in the manufacturing and welding process of the battery core can be reduced. In addition, the negative electrode current collecting disc with the structure can improve the contact area of the electrode lug and the current collecting disc, so that the electric conductivity of the battery cell electrode is improved, and the electric conductivity and the multiplying power of the battery cell are improved.
In some embodiments, the diameter of the cylindrical battery is between 3cm and 10 cm.
In summary, the present utility model provides a negative electrode current collecting plate and a cylindrical battery, where the negative electrode current collecting plate includes: a negative electrode current collecting plate body; the center hole is positioned at the center of the negative electrode current collecting disc body; the tab welding part is positioned on one surface of the negative electrode current collecting disc body and is fixedly connected with the tab of the battery; the shell welding part is formed by bending the edge of the negative electrode current collecting disc body in a direction away from the central hole; the lug welding part is a bulge formed in the direction deviating from the lug, and the bulge is arranged around the center of the negative electrode current collecting disc body. The utility model takes the bulge formed in the direction away from the lug of the cathode current collecting plate body as a lug welding part, and the concave surface of the lug welding part is used for welding with the lug; the negative electrode current collecting disc adopting the structure can reduce the gap between the empty foil electrode lug and the current collecting disc, increase the contact area between the current collecting disc and the electrode lug, and enable the electrode lug to be closely attached to the current collecting disc, thereby avoiding the defects of empty welding, explosion welding, virtual welding and the like in the welding process of the negative electrode current collecting disc and the electrode lug, and simultaneously improving the contact area between the electrode lug and the current collecting disc, further improving the conductivity of the battery cell electrode and improving the performance and the multiplying power performance of the battery cell lead.
It is to be understood that the utility model is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
1. A negative current collecting plate, comprising:
A negative electrode current collecting plate body;
The center hole is positioned at the center of the negative electrode current collecting disc body;
The tab welding part is positioned on one surface of the negative electrode current collecting disc body and is fixedly connected with the tab of the battery;
the shell welding part is formed by bending the edge of the negative electrode current collecting disc body in a direction away from the central hole;
The lug welding part is a bulge formed in the direction deviating from the lug, and the bulge is arranged around the center of the negative electrode current collecting disc body.
2. The anode current collecting tray according to claim 1, wherein the anode current collecting tray body has a thickness of 0.2mm to 1.1mm.
3. The anode current collecting tray according to claim 1, wherein the surface of the anode current collecting tray body is provided with an embossed structure.
4. The anode current collecting tray according to claim 1, wherein the anode current collecting tray body is provided with a plurality of through holes.
5. The anode current collecting plate according to claim 1, wherein the depth of the protrusions is 0.5 to 5mm.
6. The anode current collecting disk according to claim 1, wherein an edge of the anode current collecting disk body is bent in a direction away from the tab to form the case weld for forming a fixed connection with a case of the battery.
7. A cylindrical battery comprising a housing, a positive electrode tab, a negative electrode tab, a post, a positive current collecting plate, and a negative current collecting plate according to any one of claims 1-6; the negative electrode tab is fixedly connected with the tab welding part of the negative electrode current collecting disc, and the shell welding part of the negative electrode current collecting disc is fixedly connected with the shell.
8. The cylindrical battery of claim 7, wherein the diameter of the cylindrical battery is between 3cm and 10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322863208.3U CN220963676U (en) | 2023-10-24 | 2023-10-24 | Negative electrode current collecting disc and cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322863208.3U CN220963676U (en) | 2023-10-24 | 2023-10-24 | Negative electrode current collecting disc and cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220963676U true CN220963676U (en) | 2024-05-14 |
Family
ID=91021870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322863208.3U Active CN220963676U (en) | 2023-10-24 | 2023-10-24 | Negative electrode current collecting disc and cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220963676U (en) |
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2023
- 2023-10-24 CN CN202322863208.3U patent/CN220963676U/en active Active
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