CN217361846U - Utmost point ear and battery - Google Patents
Utmost point ear and battery Download PDFInfo
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- CN217361846U CN217361846U CN202221193739.5U CN202221193739U CN217361846U CN 217361846 U CN217361846 U CN 217361846U CN 202221193739 U CN202221193739 U CN 202221193739U CN 217361846 U CN217361846 U CN 217361846U
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- tab
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application provides a tab and a battery, wherein the tab comprises a welding part and an outer extension part extending from the welding part, and the welding part is used for welding with a current collector; the length of the extending portion in the width direction is larger than the length of the welding portion in the width direction, and the width direction is perpendicular to the extending direction of the extending portion. Through the difference setting of welding part and epitaxial portion to and the length of injecing epitaxial portion in the width direction is greater than the length of welding part in the width direction, make epitaxial portion reserve the certain degree and cut the surplus, through the mode of cutting above-mentioned surplus that cuts in unison, can promote the uniformity of utmost point ear center-to-center distance, also improve the qualification rate of battery that prepares, reduce the manufacturing cost of battery.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a tab and a battery.
Background
With the development of the market and the progress of the technology, people have more and more use requirements on electronic products, the requirements of product end users on batteries serving as electric energy sources are higher and higher, and the requirements on the manufacturing precision of the batteries are stricter.
In the preparation process of the battery, the central distance between the positive electrode lug and the negative electrode lug of the battery (the distance between the central line of the positive electrode lug and the central line of the negative electrode lug) is unstable due to the fluctuation influences of the thickness of the positive electrode piece and the negative electrode piece of the battery, the central distance of the electrode lugs of the battery is not up to the standard easily in production, namely, the qualified rate of the battery prepared based on the prior art is low.
Disclosure of Invention
An object of the embodiment of the application is to provide a tab and a battery, which are used for solving the problem that the qualified rate of the battery prepared by the prior art is low.
In a first aspect, an embodiment of the present application provides a tab, including:
the welding part is used for welding with a current collector;
the length of the extending portion in the width direction is larger than the length of the welding portion in the width direction, and the width direction is perpendicular to the extending direction of the extending portion.
Optionally, a center line of the extending portion and a center line of the welding portion are collinear.
Optionally, the center line of the extending portion and the center line of the welding portion are different straight lines.
Optionally, the extending portion includes a first side edge, the welding portion includes a second side edge, and the first side edge and the second side edge are located on the same straight line.
Optionally, a difference between a length of the extending portion in the width direction and a length of the welding portion in the width direction is greater than or equal to 3 mm.
Optionally, the extension portion further includes a first sub-portion and a second sub-portion, and the second sub-portion is located between the first sub-portion and the welding portion;
a length of the second sub-section in the width direction is smaller than a length of the first sub-section in the width direction, and a length of the second sub-section in the width direction is larger than a length of the welding portion in the width direction.
Optionally, the second sub-portion includes a first end connected to the first sub-portion and a second end connected to the welding portion, and a length of the first end in the width direction is greater than a length of the second end in the width direction.
Optionally, the length of the second sub-portion in the width direction gradually decreases from the first end to the second end.
Optionally, the length of the outward extending portion in the length direction of the tab is smaller than the length of the welding portion in the length direction of the tab.
In a second aspect, an embodiment of the present application further provides a battery, which includes at least two tabs, where the at least two tabs include a target tab, and the target tab is the tab according to the first aspect.
Optionally, the battery further comprises tab glue, the tab glue comprises a first glue portion arranged on the extension portion of the target tab in a surrounding mode, and the length of the first glue portion in the length direction of the target tab is larger than 0.5 mm.
The technical scheme has the following advantages or beneficial effects:
the utility model provides a utmost point ear sets up through the difference of weld part and epitaxial part to and inject epitaxial part length in the width direction and be greater than weld part length in the width direction, make epitaxial part reserve the allowance that cuts of certain degree, cut the mode of above-mentioned allowance through unifying, can promote the uniformity of utmost point ear centre-to-centre spacing, improve the qualification rate of battery that prepares promptly, reduce the manufacturing cost of battery.
Drawings
Fig. 1 is a schematic structural diagram of a tab provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another tab provided in an embodiment of the present application;
fig. 3 is a second schematic structural diagram of another tab provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of another tab provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of another tab provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a further tab provided in an embodiment of the present application;
fig. 7 is a second schematic structural diagram of a tab according to an embodiment of the present application;
fig. 8 is a schematic diagram of a tab cutting operation provided by an embodiment of the present application;
fig. 9 is a schematic diagram of another tab cutting operation provided by an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a tab according to an embodiment of the present application, and as shown in fig. 1, the tab includes:
a welding portion 10 and an extension portion 20 extending from the welding portion 10, wherein the welding portion 10 is used for welding with a current collector;
the length of the extended portion 20 in the width direction, which is perpendicular to the extending direction of the extended portion 20, is greater than the length of the welding portion 10 in the width direction.
The current collector may be a positive current collector or a negative current collector (such as an aluminum foil, a copper foil, etc.), and the welding portion 10 may be understood as a portion of the tab contacting the current collector when the tab is welded to the current collector (where the welding portion 10 is welded to a position of an empty foil reserved on the current collector); the outer extension 20 can be understood as the part of the tab that protrudes outside the current collector when the tab is welded to the current collector.
Note that, the direction indicated by the double-headed arrow in fig. 1 is the width direction.
As described above, by the differentiated arrangement of the welding portion 10 and the extending portion 20 and the limitation that the length of the extending portion 20 in the width direction is greater than that of the welding portion 10 in the width direction, a certain degree of cutting margin is left in the extending portion 20, and by uniformly cutting the cutting margin, the consistency of the center distance of the tab can be improved, that is, the yield of the prepared battery is improved, and the manufacturing cost of the battery is reduced.
For example, when the center distance of the tab of the battery does not meet the standard, the center distance of the tab of the battery can be corrected by cutting the extension portion 20, which can effectively improve the yield of the battery and reduce the manufacturing cost of the battery.
Optionally, the center line of the extension portion 20 and the center line of the welding portion 10 are collinear.
The straight line indicated by the dotted line in fig. 1 is the central line of the extending portion 20, that is, the central line of the welding portion 10, and by the above arrangement, cutting margins are left on the portions of the extending portion 20 on both sides of the central line, which can enhance the applicability of the tab in an actual application scene, and facilitate the cutting operation of the extending portion 20 by a user, that is, under the condition that the center distance of the tab of the battery does not reach the standard, the user can adaptively select one of the two sides of the central line of the extending portion 20 with the smaller cutting difficulty to cut.
Alternatively, the center line of the extension portion 20 and the center line of the welding portion 10 are different straight lines.
As described above, the center line of the extension portion 20 and the center line of the welding portion 10 are defined to be different straight lines to meet the setting requirement of the extension portion 20 in a complex scene, so that the applicability of the tab is improved.
Further, the extension portion 20 includes a first side edge, and the welding portion 10 includes a second side edge, which are located on the same line.
As shown in fig. 2, compared to the way of leaving the cutting margins on both sides of the center line of the extension portion 20, on the basis of defining that the center line of the extension portion 20 and the center line of the welding portion 10 are different straight lines, by further defining that the extension portion 20 and the welding portion 10 have the same side (meaning that the first side and the second side are on the same straight line), the cutting margins can be left on only one side of the center line of the extension portion 20 by the extension portion 20, which can increase the value of the cutting margins left on one side of the center line of the extension portion 20 by the extension portion 20, i.e. leave a larger cutting error, so as to reduce the cutting difficulty of the extension portion 20, and further reduce the manufacturing cost of the battery.
For example, taking the structure of the positive electrode and the negative electrode included in the rolled soft-package lithium battery as an example, when the positive electrode and the negative electrode included in the rolled soft-package lithium battery are the tabs provided in the embodiment of the present application, the extension portions 20 of the two tabs corresponding to the positive electrode and the negative electrode may be disposed oppositely, oppositely or identically; as shown in fig. 3, the outward extending portions 20 of one of the tabs are preferably arranged oppositely, which can avoid the interference that may be generated by the other tab when the outward extending portion 20 of the other tab is cut, and reduce the difficulty of cutting the outward extending portion 20.
Optionally, a difference between a length of the extended portion 20 in the width direction and a length of the welded portion 10 in the width direction is greater than or equal to 3 mm.
As shown in fig. 2, when the center line of the extended portion 20 and the center line of the welded portion 10 are collinear, the length of the extended portion 20 in the width direction is D, and the length of the welded portion 10 in the width direction is D, both of which satisfy the condition: D-D is more than or equal to 3 mm.
In FIG. 2, the length of the cutting allowance of the extension portion 20 on either side of the center line in the width direction is f, and as mentioned above, f is more than or equal to 1.5 mm; wherein 1.5mm is the sum of the center-to-center tolerance (0.7 mm), the allowance cutting tolerance (0.5 mm), and the trimming allowance (0.3 mm).
As described above, by limiting the length of the cutting allowance of the extension portion 20 in the width direction to be greater than or equal to 3mm, it is ensured that the extension portion 20 can reserve a cutting allowance with a sufficient length to adapt to the tab placement error in the battery manufacturing process, and the manufacturing cost of the battery is reduced.
Optionally, the extension portion 20 further includes a first sub-portion 21 and a second sub-portion 22, and the second sub-portion 22 is located between the first sub-portion 21 and the welding portion 10;
the length of the second sub-portion 22 in the width direction is smaller than the length of the first sub-portion 21 in the width direction, and the length of the second sub-portion 22 in the width direction is larger than the length of the welded portion 10 in the width direction.
As shown in fig. 4, the first sub-portion 21 and the second sub-portion 22 are arranged differently to reduce the length change of the connection between the extension portion 20 and the welding portion 10 in the width direction (the direction indicated by the double-headed arrow in fig. 4), so as to improve the structural stability of the entire tab.
For example, the pattern of the second sub-portion 22 may also be as shown in fig. 5 or fig. 6, and in practical applications, the pattern of the second sub-portion 22 may be adaptively adjusted according to practical requirements, which is not limited in the embodiment of the present application.
Alternatively, the second sub-portion 22 includes a first end connected to the first sub-portion 21 and a second end connected to the welding portion 10, and the length of the first end in the width direction is greater than the length of the second end in the width direction.
As described above, on the basis of the difference between the first sub-portion 21 and the second sub-portion 22 of the extension portion 20, the length of the first end and the second end of the second sub-portion 22 in the width direction is further limited, so as to further reduce the length variation of the connection position between the extension portion 20 and the welding portion 10 in the width direction, and ensure the structural stability of the whole tab.
Optionally, the length of the second sub-portion 22 in the width direction gradually decreases from the first end to the second end.
By limiting the length of the second sub-portion 22 in the width direction to gradually decrease from the first end toward the second end (as shown in fig. 5 or 6), the change in length in the width direction at the connection of the extension portion 20 and the welding portion 10 is gently processed, so as to ensure the structural stability of the entire tab.
Optionally, the length of the outward extension portion 20 in the length direction of the tab is smaller than the length of the welding portion 10 in the length direction of the tab.
The length direction of the tab can be understood as the extending direction of the extending portion 20, as shown in fig. 7 (the direction indicated by the double-headed arrow in fig. 7 is the length direction of the tab), and the length of the extending portion 20 in the length direction is limited to be smaller than the length of the welding portion 10 in the length direction, so that the situation that the volume of the extending portion 20 in the tab is excessive is avoided, and the tab can have excellent structural stability.
In some embodiments, the present examples further provide a battery comprising at least two tabs including a target tab, the target tab being the tab mentioned in the previous examples.
As described above, by the difference arrangement of the welding portion 10 and the extension portion 20 and the limitation that the length of the extension portion 20 in the width direction is greater than the length of the welding portion 10 in the width direction, the extension portion 20 is allowed to have a certain cutting margin, so that when the center distance of the tab of the battery does not reach the standard, the center distance of the tab of the battery is corrected by cutting the extension portion 20, thereby improving the yield of the battery and reducing the manufacturing cost of the battery.
For example, the tab after cutting the extension portion 20 can be as shown in fig. 8, the structure a shown in fig. 8 can be understood as a tab structure formed by uniformly cutting two sides of the extension portion 20 along the center line of the extension portion 20, and the structure B shown in fig. 8 can be understood as a tab structure formed by cutting two sides of the extension portion 20 along the center line of the extension portion 20 and chamfering the cut end (the end is straight, the length of the straight line is greater than or equal to 0.5 mm and less than 1 mm; meanwhile, the angle β satisfies 130 ° ≦ β ≦ 150 °); the structures C and D shown in FIG. 8 can be understood as tab structures formed by cutting both sides of the extension portion 20 along the center line of the extension portion 20 and chamfering the cut end portions (the end portions are circular arcs, and the R angle corresponding to the circular arcs of the end portions satisfies 0.5. ltoreq. R.ltoreq.1 mm).
Optionally, the battery further includes tab glue 30, the tab glue 30 includes a first glue portion disposed around the outer extension portion 20 of the target tab, and the length of the first glue portion in the length direction of the target tab is greater than 0.5 mm.
For example, the tab after cutting the extension portion 20 may also be as shown in fig. 9, where D is the width of the protruding end of the metal tape (i.e. the length of the extension portion 20 in the width direction), D is the width of the welding end of the metal tape (i.e. the length of the welding portion 10 in the width direction), f is the width of the protruding end relative to the welding end (i.e. the length of the cutting margin of the extension portion 20 on either side of the center line in the width direction), e is the width of the protruding metal tape of the tab glue 30, L is the width of the center distance of the tab, N is the inter-tab distance, and b is the overlapping width of the tab glue 30 (b is a positive number indicating that the tab glue 30 overlaps, and b is a negative number indicating that the tab glue 30 does not overlap).
As shown above, by providing the first glue portion and limiting the length of the first glue portion in the length direction of the target tab to be greater than 0.5 mm, the cutting tolerance at the edge of the tab glue 30 during the cutting operation is adapted, and the burr generated by the cutting operation is prevented from interfering with the subsequent preparation process of the battery (by limiting the length of the first glue portion in the length direction of the target tab to be greater than 0.5 mm, the burr possibly generated by the cutting operation is ensured to be coated in the tab glue 30, and the probability of the package being penetrated by the burr is reduced).
For example, referring to fig. 9, setting the width D of the welding end of the tab metal band to be 2 mm, the width D of the extending end of the tab metal band to be 5mm, the width e of the extending metal band of the tab glue 30 to be 1.75 mm, and the length of the tab glue 30 in the length direction of the tab metal band to be 5 mm; cutting the metal strip of the tab, and welding on a current collector to respectively form a positive plate and a negative plate; winding the positive plate, the negative plate and the diaphragm to form a winding core; packaging the winding core (the tab glue 30 extends out of the side line of the packaging soft coating by 0.5-2 mm); the packaged battery tab is normalized, the error of the tab center distance (the difference between the actual tab center distance of the battery tab and the preset standard center distance) is calculated through the detection equipment, the error compensation movement corresponding distance of the cutting equipment to the tab center distance is controlled, and finally the fixed width cutting operation of the tab is completed, so that the battery with qualified package but unqualified tab center distance can be corrected into the battery with qualified package and qualified tab center distance, the qualification rate of the battery is effectively improved, and the production cost of the battery is reduced.
| Group of | Winding yield | Package yield | Yield after width fixing and cutting |
| Experimental group | 96.7％ | 98.2％ | 99.1％ |
| Control group | 96.5％ | 98.3％ | - |
TABLE 1
As shown in table 1 (the experimental group object in table 1 may be understood as a battery prepared by using the tab provided in the embodiment of the present application, and the control group object in table 1 may be understood as a battery not prepared by using the tab provided in the embodiment of the present application), for the experimental group itself, the yield (i.e., yield) of the prepared battery can be improved by 0.9% by using the tab provided in the embodiment of the present application to prepare the battery and adding a step of money fixing and cutting after the battery is packaged; comparing data between the experimental group and the comparison group, it can be found that the yield of the prepared battery can be improved by 0.8% by adopting the steps of preparing the battery by using the tab provided by the embodiment of the application and adding the fixed-pattern cutting after the battery is packaged.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.
Claims (10)
1. A tab, comprising:
the welding part is used for welding with a current collector;
the length of the extended portion in the width direction is larger than the length of the welding portion in the width direction, and the width direction is perpendicular to the extending direction of the extended portion.
2. A tab as claimed in claim 1, wherein the center line of the outward extension portion and the center line of the weld portion are collinear.
3. The tab as claimed in claim 1, wherein the center line of the outward extension portion and the center line of the welding portion are different straight lines.
4. A tab as claimed in claim 3, wherein the outward extension portion includes a first side edge and the weld portion includes a second side edge, the first and second side edges being collinear.
5. The tab as claimed in claim 1, wherein a difference between a length of the outward extension portion in the width direction and a length of the welding portion in the width direction is greater than or equal to 3 mm.
6. The tab as claimed in claim 1, wherein the extension portion further includes a first sub-portion and a second sub-portion, the second sub-portion being located between the first sub-portion and the welding portion;
a length of the second sub-section in the width direction is smaller than a length of the first sub-section in the width direction, and a length of the second sub-section in the width direction is larger than a length of the welding portion in the width direction.
7. The tab as claimed in claim 6, wherein the second sub-portion includes a first end connected to the first sub-portion and a second end connected to the weld, the first end having a length in the width direction greater than a length of the second end in the width direction.
8. The tab as claimed in claim 7, wherein the length of the second sub-portion in the width direction is gradually reduced from the first end toward the second end.
9. A tab as claimed in claim 1, wherein the length of the outward extension portion in the length direction of the tab is smaller than the length of the welding portion in the length direction of the tab.
10. A battery comprising at least two tabs including a target tab, the target tab being the tab of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221193739.5U CN217361846U (en) | 2022-05-17 | 2022-05-17 | Utmost point ear and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221193739.5U CN217361846U (en) | 2022-05-17 | 2022-05-17 | Utmost point ear and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217361846U true CN217361846U (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221193739.5U Active CN217361846U (en) | 2022-05-17 | 2022-05-17 | Utmost point ear and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217361846U (en) |
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2022
- 2022-05-17 CN CN202221193739.5U patent/CN217361846U/en active Active
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