CN215896446U - Battery cell and secondary battery - Google Patents
Battery cell and secondary battery Download PDFInfo
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- CN215896446U CN215896446U CN202121764481.5U CN202121764481U CN215896446U CN 215896446 U CN215896446 U CN 215896446U CN 202121764481 U CN202121764481 U CN 202121764481U CN 215896446 U CN215896446 U CN 215896446U
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- tab
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- included angle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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 utility model provides a battery cell and a secondary battery, which comprise a first pole piece and a second pole piece; a first tab is welded on the first pole piece; the second pole piece is opposite to the first pole piece in polarity, and a second pole lug is welded on the second pole piece; the included angle between the first pole piece and the first pole lug is alpha, alpha is smaller than or larger than 90 degrees, the included angle between the second pole piece and the second pole lug is beta, and beta is larger than or smaller than 90 degrees. Compared with the prior art, in the battery cell provided by the utility model, the included angle between one tab and the pole piece is set to be larger than 90 degrees, the included angle between the other tab and the pole piece is set to be smaller than 90 degrees, and the two tabs are arranged in the shape of the outer eight, so that the outer eight state formed when the tabs are welded can be offset after the tabs are bent along the arc-shaped area, and the exposed parts of the two tabs can be in the parallel state, so that the inner eight problem after the positive and negative tabs of the current narrow and thick battery cell are bent is solved, and the packaging yield and the safety performance of the battery cell are improved.
Description
Technical Field
The utility model relates to the field of batteries, in particular to a battery core and a secondary battery.
Background
Along with the rapid development of products such as bluetooth headset, wearable electronic equipment, intelligent ring, intelligent wrist-watch, intelligent wrist strap, intelligence are talkbacked and are read pen, intelligent jewelry, intelligence wearing, the form also begins to develop towards special-shaped direction, has also proposed higher requirement to its supporting electric core. The narrow and thick battery can save space for product design due to the characteristic structure of the battery, and the battery capacity is maximized, so that the energy density of the battery is improved, and the battery is widely applied. Therefore, the development of a narrow and thick battery having high safety performance is one of the important development directions in the future.
At present, the mainstream narrow and thick soft package batteries in the market all adopt an external welding structure, and the anode and cathode lugs are led out at the same end. However, because the two edges in the width direction have larger arc degrees, when the tabs are folded, the tabs are bent along the arc-shaped area, so that the two tabs are subjected to an inner eight condition after being packaged in a shell, as shown in fig. 1, the short circuit risk of the battery cell is increased, and the safety performance of the battery cell is reduced.
In view of the above, it is necessary to provide a technical solution to the above problems.
SUMMERY OF THE UTILITY MODEL
One of the objects of the present invention is: the utility model provides a battery cell, aiming at solving the inner eight problems after bending of positive and negative lugs of the current narrow and thick battery cell.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a cell, comprising:
the first pole piece is welded with a first tab;
the second pole piece is opposite to the first pole piece in polarity and welded with a second pole lug;
the included angle between the first pole piece and the first pole lug is alpha, alpha is smaller than or larger than 90 degrees, the included angle between the second pole piece and the second pole lug is beta, and beta is larger than or smaller than 90 degrees.
Preferably, an included angle alpha between the first pole piece and the first pole lug is 40-85 degrees, and an included angle beta between the second pole piece and the second pole lug is 95-140 degrees.
Preferably, an included angle alpha between the first pole piece and the first pole lug is 60-80 degrees, and an included angle beta between the second pole piece and the second pole lug is 100-120 degrees.
Preferably, the sum of an included angle α between the first pole piece and the first tab and an included angle β between the second pole piece and the second tab is 180 °.
Preferably, tab glue perpendicular to the first tab and the second tab is arranged on the first tab and the second tab.
Preferably, a protection glue parallel to the first tab and/or the second tab is bonded on the surface of the first tab and/or the second tab.
Preferably, the first pole piece is a positive pole piece or a negative pole piece, and the first tab is a positive pole tab or a negative pole tab; the second pole piece is a negative pole piece or a positive pole piece, and the second pole lug is a negative pole lug or a positive pole lug.
Preferably, the negative electrode tab is a nickel tab or a copper tab.
Preferably, one end of the nickel tab, which is far away from the negative plate, is arc-shaped.
Another object of the present invention is to provide a secondary battery including the battery cell of any one of the above aspects.
The utility model has the beneficial effects that: the utility model provides a battery cell, which comprises a first pole piece and a second pole piece; a first tab is welded on the first pole piece; the second pole piece is opposite to the first pole piece in polarity, and a second pole lug is welded on the second pole piece; the included angle between the first pole piece and the first pole lug is alpha, alpha is smaller than or larger than 90 degrees, the included angle between the second pole piece and the second pole lug is beta, and beta is larger than or smaller than 90 degrees. Compared with the prior art, in the battery cell provided by the utility model, the included angle between one tab and the pole piece is set to be larger than 90 degrees, the included angle between the other tab and the pole piece is set to be smaller than 90 degrees, and the two tabs are arranged in the shape of the outer eight, so that the outer eight state formed when the tabs are welded can be offset after the tabs are bent along the arc-shaped area, and the exposed parts of the two tabs can be in the parallel state, so that the inner eight problem after the positive and negative tabs of the current narrow and thick battery cell are bent is solved, and the packaging yield and the safety performance of the battery cell are improved. In addition, eight outer types of welding positive and negative electrode ears compare in conventional 90 welding positive and negative electrode ears, under equal width, can also utilize the actual space of electric core inside as far as, promote the energy density of electric core.
Drawings
Fig. 1 is a schematic structural diagram of a conventional battery cell with a bent tab.
Fig. 2 is a schematic structural view of the utility model in which the included angle between the tab and the pole piece is less than 90 °.
Fig. 3 is a schematic structural view of the utility model in which the included angle between the tab and the pole piece is greater than 90 °.
Fig. 4 is a schematic view showing the structure of a secondary battery according to the present invention.
Fig. 5 is a schematic view of the overall structure of the battery cell of the present invention.
Fig. 6 is a schematic structural view of the tab of the present invention before being bent.
Fig. 7 is a schematic structural diagram of the battery cell after the tab is bent.
Fig. 8 is a top view of the battery cell after the tab is bent according to the present invention.
In the figure: 1-a first pole piece; 2-a second pole piece; 3-a first tab; 4-a second tab; 5-electric core; 6-pole lug glue; 7-protective glue.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
The utility model provides a secondary battery, which comprises a battery shell and a battery core 5, wherein the battery shell can be an aluminum plastic film.
The battery cell 5 comprises a first pole piece 1 and a second pole piece 2; a first tab 3 is welded on the first pole piece 1; the second pole piece 2 is opposite to the first pole piece 1 in polarity, and a second pole lug 4 is welded on the second pole piece; the included angle between the first pole piece 1 and the first pole lug 3 is alpha, alpha is smaller than or larger than 90 degrees, the included angle between the second pole piece 2 and the second pole lug 4 is beta, and beta is larger than or smaller than 90 degrees. As shown in FIGS. 2-3.
The first pole piece 1 is a positive pole piece or a negative pole piece, and the first tab 3 is a positive pole tab or a negative pole tab; the second pole piece 2 is a negative pole piece or a positive pole piece, and the second pole piece 4 is a negative pole piece or a positive pole piece.
The first specific implementation mode is as follows: the first pole piece 1 is a positive pole piece, the first tab 3 is a positive pole tab, the positive pole tab is welded in an empty foil area of a current collector of the positive pole piece, the positive pole current collector can be an aluminum foil, and the positive pole tab is an aluminum tab. Before the positive tab is welded to the positive aluminum foil, the included angle between the positive tab and the positive plate is calculated and then the positive tab and the positive aluminum foil are welded, as shown in fig. 2, the included angle between the positive tab and the positive plate is smaller than 90 degrees. The second pole piece 2 is the negative pole piece, second pole ear 4 is the negative pole ear, and the negative pole ear welds in the empty paper tinsel district of the mass flow body of negative pole piece, and the negative pole mass flow body can be the copper foil, and the material of negative pole ear can be copper, nickel or copper commentaries on classics nickel. Similarly, before welding the negative electrode tab to the negative copper foil, the included angle between the negative electrode tab and the negative copper foil is calculated and then welding is performed, as shown in fig. 3, the included angle between the negative electrode tab and the negative electrode sheet is greater than 90 °. In addition, one end of the negative electrode tab, which is far away from the negative electrode sheet, is arranged to be in an arc shape, and the arc shape comprises at least one of a circle, a semicircle, an ellipse and the like. Therefore, the problems that the battery core 5 is scratched by the negative electrode lug and the lug sleeve is punctured due to the fact that the material of the negative electrode lug is hard can be solved, and the application range of the external eight-type lug is expanded.
The second specific implementation mode is as follows: the first pole piece 1 is a positive pole piece, the first tab 3 is a positive pole tab, the positive pole tab is welded in an empty foil area of a current collector of the positive pole piece, the positive pole current collector can be an aluminum foil, and the positive pole tab is an aluminum tab. Before the positive tab is welded to the positive aluminum foil, the included angle between the positive tab and the positive plate is calculated and then the positive tab and the positive aluminum foil are welded, as shown in fig. 3, the included angle between the positive tab and the positive plate is larger than 90 degrees. The second pole piece 2 is the negative pole piece, second pole ear 4 is the negative pole ear, and the negative pole ear welds in the empty paper tinsel district of the mass flow body of negative pole piece, and the negative pole mass flow body can be the copper foil, and the material of negative pole ear can be copper, nickel or copper commentaries on classics nickel. Similarly, before welding the negative electrode tab to the negative copper foil, the included angle between the negative electrode tab and the negative copper foil is calculated and then welding is performed, as shown in fig. 2, the included angle between the negative electrode tab and the negative electrode sheet is smaller than 90 °. In addition, one end of the negative electrode tab, which is far away from the negative electrode sheet, is arranged to be in an arc shape, and the arc shape comprises at least one of a circle, a semicircle, an ellipse and the like. Therefore, the problems that the battery core 5 is scratched by the negative electrode lug and the lug sleeve is punctured due to the fact that the material of the negative electrode lug is hard can be solved, and the application range of the external eight-type lug is expanded.
In addition, in the two embodiments, the first tab 3 is further provided with a tab glue 6 perpendicular to the first tab, that is, the tab glue 6 and the first pole piece 1 relatively form a certain included angle, when the included angle between the first tab 3 and the first pole piece 1 is smaller than 90 °, the included angle between the tab glue 6 and the first pole piece 1 should be larger than 90 °, and when the included angle between the first tab 3 and the first pole piece 1 is larger than 90 °, the included angle between the tab glue 6 and the first pole piece 1 should be smaller than 90 °. Similarly, the second pole piece 4 is also provided with a tab glue 6 which is perpendicular to the second pole piece 2, the tab glue 6 and the second pole piece 2 also form an included angle, when the included angle between the second pole piece 2 and the second pole piece 2 is smaller than 90 °, the included angle between the tab glue 6 and the second pole piece 2 should be larger than 90 °, and when the included angle between the second pole piece 4 and the second pole piece 2 is larger than 90 °, the included angle between the tab glue 6 and the second pole piece 2 should be smaller than 90 °.
In both embodiments, the protection paste 7 is adhered to the surface of the first tab 3 in parallel, that is, the protection paste 7 and the first pole piece 1 have the same included angle α relatively. Similarly, a protective glue 7 is adhered to the surface of the second pole ear 4 in parallel, and the protective glue 7 and the second pole piece 2 have the same included angle β.
Of course, the first pole piece 1 may also be a negative pole piece, the first tab 3 may also be a negative pole tab, and correspondingly, the second pole piece 2 is a positive pole piece, and the second tab 4 is a positive pole tab, and reference may be made to the above first and second embodiments for designing the included angle between the tab and the pole piece.
Further, the included angle alpha between the first pole piece 1 and the first pole lug 3 is 40-85 degrees, and the included angle beta between the second pole piece 2 and the second pole lug 4 is 95-140 degrees.
Further preferably, an included angle α between the first pole piece 1 and the first tab 3 is 50 to 80 °, and an included angle β between the second pole piece 2 and the second tab 4 is 100 to 130 °.
Further preferably, an included angle α between the first pole piece 1 and the first tab 3 is 60 to 80 °, and an included angle β between the second pole piece 2 and the second tab 4 is 100 to 120 °. Preferably, the included angle α between the first pole piece 1 and the first pole tab 3 may be 60 °, 70 °, 80 °, and the included angle β between the second pole piece 2 and the second pole tab 4 may be 120 °, 110 °, 100 °.
The included angle between the pole piece and the pole lug is set within the range, the pole lug is welded at the included angle within the range, after the pole lug is wound into the battery cell 5, although the two pole lugs are in an outer eight state, after the pole lug is subsequently folded, the winding of the battery cell 5 is oval, the wound state can be as shown in fig. 4-5, particularly for a narrow and thick battery cell 5, the radian of the winding is larger, the two outer eight type pole lugs are bent and close along an arc area, the outer eight state formed when the pole lugs are welded can be offset, under the condition that the root parts of the pole lugs of the battery cell 5 are not in direct contact, the two exposed pole lugs can be kept parallel after being packaged, as shown in fig. 6-8, the packaging yield of the battery cell 5 is improved, the quality of the battery cell 5 is improved, and the safety performance of the battery is also improved.
More preferably, the sum of an included angle α between the first pole piece 1 and the first pole tab 3 and an included angle β between the second pole piece 2 and the second pole tab 4 is 180 °. When the sum of the included angles between the two pole lugs and the pole piece is 180 degrees, the two pole lugs are bent along an arc shape, so that the parallel state is easier to present, and the improvement effect is better.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A battery cell, comprising:
the first pole piece is welded with a first tab;
the second pole piece is opposite to the first pole piece in polarity and welded with a second pole lug;
the included angle between the first pole piece and the first pole lug is alpha, alpha is smaller than or larger than 90 degrees, the included angle between the second pole piece and the second pole lug is beta, and beta is larger than or smaller than 90 degrees.
2. The battery cell of claim 1, wherein an included angle α between the first pole piece and the first tab is 40-85 °, and an included angle β between the second pole piece and the second tab is 95-140 °.
3. The battery cell of claim 2, wherein an included angle α between the first pole piece and the first tab is 60-80 °, and an included angle β between the second pole piece and the second tab is 100-120 °.
4. The electric core of claim 2 or 3, wherein the sum of an included angle α between the first pole piece and the first tab and an included angle β between the second pole piece and the second tab is 180 °.
5. The battery cell of claim 1, wherein tab glue perpendicular to the first tab and the second tab is disposed on the first tab and the second tab.
6. The battery cell of claim 1, wherein a protective adhesive is bonded to a surface of the first tab and/or the second tab in parallel therewith.
7. The battery cell of claim 1, wherein the first pole piece is a positive pole piece or a negative pole piece, and the first tab is a positive pole tab or a negative pole tab; the second pole piece is a negative pole piece or a positive pole piece, and the second pole lug is a negative pole lug or a positive pole lug.
8. The electrical core of claim 7, wherein the negative electrode tab is a nickel tab or a copper tab.
9. The battery cell of claim 8, wherein an end of the nickel tab, which is away from the negative electrode tab, is arc-shaped.
10. A secondary battery comprising the cell according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121764481.5U CN215896446U (en) | 2021-07-30 | 2021-07-30 | Battery cell and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121764481.5U CN215896446U (en) | 2021-07-30 | 2021-07-30 | Battery cell and secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215896446U true CN215896446U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121764481.5U Active CN215896446U (en) | 2021-07-30 | 2021-07-30 | Battery cell and secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215896446U (en) |
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2021
- 2021-07-30 CN CN202121764481.5U patent/CN215896446U/en active Active
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