CN214848954U - Battery core pole piece and battery core - Google Patents
Battery core pole piece and battery core Download PDFInfo
- Publication number
- CN214848954U CN214848954U CN202120521991.3U CN202120521991U CN214848954U CN 214848954 U CN214848954 U CN 214848954U CN 202120521991 U CN202120521991 U CN 202120521991U CN 214848954 U CN214848954 U CN 214848954U
- Authority
- CN
- China
- Prior art keywords
- edge
- pole piece
- groove
- limit
- lug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007704 transition Effects 0.000 claims description 11
- 238000007373 indentation Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 6
- 238000004804 winding Methods 0.000 abstract description 4
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 5
- 230000007306 turnover Effects 0.000 description 4
- 238000003698 laser cutting Methods 0.000 description 3
- 230000002742 anti-folding effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses an electricity core pole piece and electricity core relates to battery technical field. The battery core pole piece comprises a pole piece body and a pole lug. The side of pole piece body extends and is provided with utmost point ear, and utmost point ear is including consecutive first limit, second limit and third limit at least, and first limit and third limit all link to each other with the side of pole piece body, have the arc limit between first limit and the second limit and between second limit and the third limit. The tabs are recessed inwards to form grooves. Arc edges are arranged between the first edge and the second edge and between the second edge and the third edge of the tab, so that the corner positions of the outer edge of the tab are of arc edge structures, the stress of the tab in the processing and winding processes is reduced, and the tab is prevented from being turned over or warped. Meanwhile, the lug is sunken inwards to form a groove, so that the lug is of a three-dimensional structure, the strength and the flexibility of the lug are enhanced, the anti-turnover capacity of the lug is further improved, and the production efficiency and the yield of the battery cell are improved.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to an electric core pole piece and electric core.
Background
At present, in the production process of lithium ion batteries, foil blank regions on two sides of a pole piece are cut into pole lugs by adopting a laser cutting technology. Because the rolling rate of the foil area and the blank areas at the two sides of the pole piece are different, the electrode lugs are easy to turn over, warp or fold inwards in the laser cutting and winding process, and the production efficiency and the yield of the battery cell are influenced.
The existing improvement scheme is as follows: and (4) processing the pole piece into an indentation by adopting an embossing process so as to increase the strength of the pole lug. Along with the requirement on the energy density of the battery cell is higher and higher, the thickness of the pole lug is thinner and thinner, the strength of the pole lug is improved by the existing indentation process with smaller strength, the anti-folding effect of the thinner pole lug is not obvious, and the production efficiency and the yield of the pole piece can not be effectively improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electricity core pole piece to avoid electric core pole piece to take place to turn over and roll over, improve the production efficiency and the yields of electric core pole piece.
To achieve the purpose, the technical proposal adopted by the utility model is that:
a cell pole piece, comprising:
a pole piece body;
the side edge of the pole piece body is provided with the pole lug in an extending mode, the pole lug at least comprises a first edge, a second edge and a third edge which are sequentially connected, the first edge and the third edge are both connected with the side edge of the pole piece body, and arc-shaped edges are arranged between the first edge and the second edge and between the second edge and the third edge; the tabs are recessed inwards to form grooves.
Further, the first edge, the second edge and the third edge enclose part of the outer edge of the opening end of the groove.
Further, the arc-shaped edges are arranged between the side edges of the pole piece body and the first edge and the third edge respectively; the groove is a quadrangular pyramid groove, and one end of the edge of the quadrangular pyramid groove is intersected with the corresponding arc-shaped edge.
Furthermore, the rectangular pyramid groove has a rectangular groove bottom, and the other end of the edge is intersected with a corresponding corner on the rectangular groove bottom.
Furthermore, the groove is a conical groove, and the circumference of the opening end of the conical groove is connected with the outer edge of the tab in an inner mode.
Further, the conical groove has a circular groove bottom.
Further, the inner wall of the groove is provided with an indentation.
Further, the arc-shaped edge is a transition fillet, and the angle of the circle center corresponding to the transition fillet is greater than 90 degrees and less than 180 degrees.
Further, the depth of the groove is 0.5 mm-1 mm.
Another object of the utility model is to provide an electricity core to avoid electric core pole piece to take place to turn over and roll over, improve the production efficiency and the yields of electric core.
To achieve the purpose, the technical proposal adopted by the utility model is that:
a battery cell comprises the battery cell pole piece.
The utility model has the advantages that:
the utility model provides an electricity core pole piece and electricity core, between the first edge of utmost point ear and the second limit, all have the arc limit between second limit and the third limit for the corner position of the outer fringe of utmost point ear is the arc limit structure, has reduced the stress of utmost point ear in processing and coiling process, avoids utmost point ear to take place to turn over a book or warpage. Meanwhile, the lug is sunken inwards to form a groove, so that the lug is of a three-dimensional structure, the strength and the flexibility of the lug are enhanced, the anti-turnover performance of the lug is further improved, and the production efficiency and the yield of the battery cell are improved.
Drawings
Fig. 1 is an end view of a part of a cell pole piece provided by an embodiment of the present invention.
The component names and designations in the drawings are as follows:
1. a pole piece body; 2. a tab; 20. transition fillets; 21. a first side; 22. a second edge; 23. a third side; 24. an edge; 25. rectangular tank bottom.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The embodiment discloses a battery cell, which is formed by winding a battery cell pole piece and a diaphragm together. The existing battery core pole piece is generally thin, so that the deflection of the battery core pole piece is reduced. The indentation formed by rolling on the surface of the tab has poor effect of improving the strength of the pole piece, and the problem that the tab is folded can not be effectively solved.
In order to solve the above problem, as shown in fig. 1, the present embodiment further discloses a cell pole piece, where the cell pole piece includes a pole piece body 1 and a tab 2. The side of pole piece body 1 extends and is provided with utmost point ear 2, and utmost point ear 2 is at least including consecutive first limit 21, second limit 22 and third limit 23, and first limit 21 and third limit 23 all link to each other with the side of pole piece body 1, have the arc limit between first limit 21 and the second limit 22 and between second limit 22 and the third limit 23. The tab 2 is recessed inward to form a groove.
In this embodiment, arc edges are respectively arranged between the first edge 21 and the second edge 22 and between the second edge 22 and the third edge 23 of the tab 2, so that the corner positions of the outer edge of the tab 2 are arc edge structures, the stress of the tab 2 in the processing and winding processes is reduced, and the tab 2 is prevented from being folded or warped. Meanwhile, the lug 2 is sunken inwards to form a groove, so that the lug 2 is of a three-dimensional structure, the strength and the flexibility of the lug 2 are enhanced, the anti-turnover capacity of the lug 2 is further improved, and the production efficiency and the yield of the battery cell are improved.
The tab 2 of the present embodiment is substantially rectangular, and the outer edge of the tab 2 is composed of a first side 21, a second side 22, a third side 23, and a part of the side edge of the pole piece body 1 (i.e. the fourth side of the tab 2) located between the first side 21 and the third side 23, wherein the first side 21 and the third side 23 are disposed opposite to each other, and the second side 22 and the fourth side are disposed opposite to each other.
It should be noted that, the side edges of the pole piece body 1 and the first edge 21 and the third edge 23 also have arc-shaped edges, so as to avoid stress concentration between the pole piece body 1 and the tab 2.
The arc edge of this embodiment is transition fillet 20, and the centre of a circle angle that transition fillet 20 corresponds is greater than 90 and is less than 180, has reduced the frictional force of electric core pole piece in the roll-in process. For example, the corresponding central angle of the transition fillets 20 may be 100 °, 120 °, 135 °, 160 °, 170 °, or the like. The transition fillets 20 at the outer edges of the tabs 2 in the embodiment are formed by laser cutting. Transition fillets 20 with different circle center angles can be cut according to the specific size of the tab 2.
Continuing as shown in fig. 1, the tab 2 of the present embodiment is recessed inwards to form a groove, so that the entire tab 2 is in a three-dimensional structure, the strength and flexibility of the tab 2 are enhanced, and the anti-folding capability of the tab 2 is improved. The three-dimensional structure of the lug 2 is arranged, so that the multiple lugs 2 in the core of the battery cell can be overlapped and superposed together, and the ultrasonic welding of the lugs 2 is facilitated.
Specifically, the first edge 21, the second edge 22 and the third edge 23 enclose a part of the outer edge of the opening end of the groove. The groove of this embodiment is a rectangular pyramid groove having a rectangular groove bottom 25, one end of the edge 24 of the rectangular pyramid groove intersects the corresponding transition fillet 20, and the other end of the edge 24 intersects the corresponding corner on the rectangular groove bottom 25. The processing of the quadrangular pyramid groove is convenient, and the side wall of the groove is prevented from being folded.
The recess may be roll formed by a die roll. The degree of depth of recess is 0.5mm ~ 1mm, and the vertical height between the tank bottom of recess and the open end of recess promptly is 0.5mm ~ 1mm, both can strengthen utmost point ear 2's intensity, can avoid utmost point ear 2 that the degree of depth of utmost point ear 2 too big leads to appear quality problems such as damage or fold simultaneously. For example, the depth of the groove may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or the like.
In an alternative embodiment, the recess may also be a conical groove, the circumference of the open end of which is inscribed in the outer edge of the tab 2. Specifically, the conical groove has a circular groove bottom, and the depth of the groove is also 0.5 mm-1 mm. For example, the depth of the conical groove may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or the like.
In order to further enhance the strength of the tab 2, the inner wall of the groove may be further provided with a plurality of indentations (not shown), and the plurality of indentations are crosswise arranged on the inner surface or the outer surface of the tab 2.
The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A cell pole piece, comprising:
a pole piece body (1);
the pole piece comprises a pole lug (11), wherein the pole lug (11) is arranged on the side edge of the pole piece body (1) in an extending mode, the pole lug (11) at least comprises a first edge (21), a second edge (22) and a third edge (23) which are sequentially connected, the first edge (21) and the third edge (23) are both connected with the side edge of the pole piece body (1), and arc-shaped edges are arranged between the first edge (21) and the second edge (22) and between the second edge (22) and the third edge (23); the tab (11) is recessed inwards to form a groove.
2. The cell pole piece of claim 1, characterized in that the first edge (21), the second edge (22) and the third edge (23) enclose part of the outer edge of the open end of the groove.
3. The cell pole piece according to claim 2, characterized in that the arc-shaped edges are provided between the side edges of the pole piece body (1) and the first edge (21) and the third edge (23), respectively; the groove is a quadrangular pyramid groove, and one end of an edge (24) of the quadrangular pyramid groove is intersected with the corresponding arc-shaped edge.
4. The cell pole piece of claim 3, characterized in that the rectangular pyramid groove has a rectangular groove bottom (25), and the other end of the edge (24) intersects with a corresponding corner on the rectangular groove bottom (25).
5. The cell pole piece according to claim 1, characterized in that the groove is a conical groove, and the circumference of the open end of the conical groove is inscribed in the outer edge of the tab (11).
6. The cell pole piece of claim 5, wherein the conical groove has a rounded groove bottom.
7. The cell pole piece according to any one of claims 1 to 6, wherein the inner wall of the groove is provided with indentations.
8. The cell pole piece according to any one of claims 1 to 6, characterized in that the arc-shaped edge is a transition fillet (20), and the corresponding circle center angle of the transition fillet (20) is greater than 90 ° and less than 180 °.
9. The cell pole piece of any one of claims 1 to 6, wherein the groove has a depth of 0.5mm to 1 mm.
10. A battery cell comprising the cell pole piece of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120521991.3U CN214848954U (en) | 2021-03-12 | 2021-03-12 | Battery core pole piece and battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120521991.3U CN214848954U (en) | 2021-03-12 | 2021-03-12 | Battery core pole piece and battery core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214848954U true CN214848954U (en) | 2021-11-23 |
Family
ID=78885234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120521991.3U Active CN214848954U (en) | 2021-03-12 | 2021-03-12 | Battery core pole piece and battery core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214848954U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024060680A1 (en) * | 2022-09-19 | 2024-03-28 | 珠海冠宇电池股份有限公司 | Battery electrode sheet, battery cell and battery |
-
2021
- 2021-03-12 CN CN202120521991.3U patent/CN214848954U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024060680A1 (en) * | 2022-09-19 | 2024-03-28 | 珠海冠宇电池股份有限公司 | Battery electrode sheet, battery cell and battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113193165B (en) | Tab pole piece and winding battery | |
| JP2020109737A (en) | Electrode assembly and battery | |
| CN211017230U (en) | Battery cell pole piece and battery cell | |
| CN216435937U (en) | Battery core and battery | |
| CN216120651U (en) | Battery core and battery of battery | |
| CN113270693A (en) | Full-tab pole piece and winding battery | |
| WO2023088433A1 (en) | Plate and battery | |
| WO2017152575A1 (en) | Secondary battery tab and secondary battery | |
| CN214848954U (en) | Battery core pole piece and battery core | |
| US11145868B2 (en) | Electrode piece, cell and energy storage device | |
| KR101048690B1 (en) | Lithium-ion Secondary Battery | |
| CN210956828U (en) | Lithium battery current collecting disc | |
| CN218182428U (en) | Battery, battery pack and electric equipment | |
| CN216354342U (en) | Battery core pole group and laminated battery | |
| CN115425370A (en) | Connection piece, battery package and consumer | |
| CN215070050U (en) | Prevent pole piece and lamination formula lithium cell of corner rupture | |
| CN221150070U (en) | Pole piece, battery cell and battery | |
| CN220963676U (en) | Negative electrode current collecting disc and cylindrical battery | |
| EP4297171A1 (en) | Connector and battery | |
| CN205177930U (en) | Prevent short circuit battery | |
| CN220021168U (en) | Pole piece, battery core and battery | |
| CN220863062U (en) | Welding head and welding device for pole lugs of battery pole pieces | |
| CN220963675U (en) | Positive electrode current collecting disc and cylindrical battery | |
| CN220121880U (en) | Battery cell and battery | |
| CN218867152U (en) | Full-tab battery current collector and battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |