CN217507590U - Multi-tab pole piece, secondary battery cell and battery - Google Patents
Multi-tab pole piece, secondary battery cell and battery Download PDFInfo
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- CN217507590U CN217507590U CN202220866538.0U CN202220866538U CN217507590U CN 217507590 U CN217507590 U CN 217507590U CN 202220866538 U CN202220866538 U CN 202220866538U CN 217507590 U CN217507590 U CN 217507590U
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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
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Abstract
The utility model relates to the technical field of batteries, a multi-tab pole piece, secondary battery electricity core and battery are disclosed, the multi-tab pole piece includes pole piece body and utmost point ear, and utmost point ear is the slope quadrangle structure, including first sideline, second sideline, third sideline and fourth sideline, the lower extreme of first sideline and second sideline intersects with the both ends of fourth sideline respectively, and is formed with the outer chamfer of first circular arc in crossing department. The utility model provides a beneficial effect that technical scheme brought: the length of the pole lug passing roller is increased, the area of the pole lug passing roller is increased and then reduced, the stress condition of the pole lug is relieved, and the wrinkling phenomenon caused by uneven stress is reduced; the lug with the inclined quadrilateral structure is more easily pasted with a roller, so that the lug is prevented from being folded; can realize the stress dispersion of its root, optimize utmost point ear root atress condition, solve roll up the core and close the core and go into the electric core short circuit problem that root infolding that the shell arouses because of crescent fold of utmost point ear when the core.
Description
Technical Field
The utility model relates to a battery technology field, in particular to multi-tab pole piece, secondary battery electricity core and battery.
Background
In recent years, the lithium battery industry is developed extremely rapidly, various types of products are in short supply, and the safety performance of the battery is required to be highly guaranteed under such a situation, so that the safety research on the lithium battery is more and more in a hot research direction.
At present, the naked electric core of the lithium ion battery is mainly formed by winding or laminating, and certain problems still exist in the assembling process of the electric core and the using process: the root of the tab forms crescent wrinkles, namely the pole piece is subjected to die cutting and then is taken away, the tab has certain stress, and the stress is mainly concentrated at the root of the tab; when passing the roller, because it has certain camber to cross the roller, utmost point ear takes the stroke and cross roller camber and take place the bending along wearing, when utmost point ear surface stress can't release completely, utmost point ear fold outwards is crescent, and crescent fold very easily leads to the pole piece to appear in the coiling process that batch utmost point ear is creased or the circumstances such as inflection, pole piece damage to and roll up the core and fall the inflection and cause positive negative pole short circuit easily when closing the core and going into the shell utmost point ear, arouse product incident.
SUMMERY OF THE UTILITY MODEL
The utility model provides a many utmost point ear pole piece, secondary battery electricity core and battery to solve above-mentioned problem.
In a first aspect, the utility model provides a multi-polar pole piece, include the pole piece body and follow the length direction of pole piece body sets gradually a plurality of utmost point ear in the coating district of pole piece body, every utmost point ear is the slope quadrangle structure, utmost point ear includes first sideline, second sideline, third sideline and fourth sideline, the fourth sideline is located the coating district, the third sideline with the fourth sideline sets up relatively and keeps away from the coating district, first sideline with the second sideline sets up relatively, first sideline with the lower extreme of second sideline respectively with the both ends of fourth sideline are crossing, and are formed with first circular arc outer chamfer in crossing department, first sideline with the upper end of second sideline respectively with the both ends of third sideline are crossing.
Further, the first side line and the fourth side line form a first included angle, the first included angle is an acute angle or an obtuse angle, the second side line and the fourth side line form a second included angle, and the second included angle is an obtuse angle or an acute angle.
Further, the first edge line is parallel to the second edge line.
Further, the spatial extension line of the first sideline intersects with the spatial extension line of the second sideline.
Furthermore, second arc chamfers are arranged at the intersection of the two ends of the third sideline and the first sideline and the second sideline respectively.
Furthermore, a plurality of utmost point ear symmetry sets up the both sides of pole piece body.
In a second aspect, the utility model provides a secondary battery electricity core, be in including positive plate, negative pole piece and setting the positive plate with diaphragm between the negative pole piece, the positive plate with the negative pole piece all include if the multiple-lug pole piece.
Further, the air conditioner is provided with a fan,
the polar lugs of the positive plate and the negative plate incline towards the outside of the winding core of the secondary battery cell; or
And the tabs of the positive plate and the negative plate incline towards the winding core of the secondary battery cell.
Further, the distance between the tab of the positive plate and the tab of the negative plate is 16-20mm, and the distance between the tab of the positive plate or the tab of the negative plate and the outer edge of the winding core of the secondary battery cell is more than or equal to 5 mm.
The third aspect, the utility model provides a battery, including the aluminum hull with secondary battery electricity core, the aluminum hull surrounds secondary battery electricity core.
The utility model provides a beneficial effect that technical scheme brought includes:
1. the lug is arranged into the oblique quadrilateral structure, so that the over-roll length of the lug is increased in the roll passing or rolling process of the lug, the roll passing area of the lug is increased and then reduced, the stress condition of the lug is relieved, and the wrinkling phenomenon caused by uneven stress is reduced;
2. when the lug passes through the roller, the lug with the inclined quadrilateral structure is more easily pasted on the roller, and the lug is prevented from being folded;
3. when the electrode tab rolls, if the intersection of the third sideline and the second sideline enters the roll first, the second arc chamfer at the intersection is easier to realize that the electrode tab is pasted on the roll, so that the electrode tab is prevented from being folded;
4. utmost point ear is at the downward in-process of buckling, and the utmost point ear of slope quadrangle structure can realize the stress dispersion of its root, optimizes utmost point ear root atress condition, solves to roll up the core and close the electric core short circuit problem that the root infolding that core arouses because of crescent fold when going into the shell.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Figure 1 is the utility model discloses the cross cutting schematic diagram of many utmost point ear pole piece.
Fig. 2 is an enlarged schematic view of one tab in fig. 1.
Fig. 3 is a schematic structural diagram of the secondary battery cell of the present invention.
Fig. 4 is a schematic structural diagram of another embodiment of the secondary battery cell of the present invention.
In the figure:
10-a pole piece body; 11-a coating zone;
20-pole ear; 21-a first edge line; 22-a second edge line; 23-a third edge line; 24-a fourth edge line; 25-a first lower corner region; 26-a first upper corner region; 27-a second lower corner region; 28-a second upper corner region; theta 1-a first included angle; theta 2-a second included angle;
30-secondary battery cell.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The multi-tab pole piece shown in fig. 1 comprises a pole piece body 10 and a plurality of tabs 20 sequentially arranged in a coating area 11 of the pole piece body 10 along the length direction of the pole piece body 10.
In fig. 1, the direction D is the die cutting tape transport direction or the length direction of the pole piece body 10.
Each of the tabs 20 has a trapezoidal structure.
The tab 20 is inclined in the same direction or opposite to the direction of the die cutting tape.
A plurality of tabs 20 are symmetrically arranged on two sides of the pole piece body 10.
As shown in fig. 1, in one embodiment, a plurality of tabs 20 are symmetrically disposed on two sides of the pole piece body 10 with a first symmetry line as a symmetry axis, and the first symmetry line passes through the center of the pole piece body 10 along the length direction of the pole piece body 10.
In one embodiment, the tabs 20 are symmetrically disposed on two sides of the pole piece body 10 with a first central point as a symmetric center, and the first central point is an intersection point of connecting lines of corresponding points of the tabs 20 on the two sides.
As shown in fig. 2, the tab 20 includes a first sideline 21, a second sideline 22, a third sideline 23 and a fourth sideline 24, the fourth sideline 24 is located in the coating area 11, the third sideline 23 and the fourth sideline 24 are oppositely disposed and far away from the coating area 11, the first sideline 21 and the second sideline 22 are oppositely disposed, lower ends of the first sideline 21 and the second sideline 22 are respectively intersected with two ends of the fourth sideline 24, and a first arc outer chamfer is formed at the intersection, taking fig. 2 as an example, an arc center of a first arc outer chamfer formed by the first sideline 21 and the fourth sideline 24 is located on the left side of the first sideline 21, and an arc center of another first arc outer chamfer formed by the second sideline 22 and the fourth sideline 24 is located on the right side of the second sideline 22. The upper ends of the first side line 21 and the second side line 22 intersect with both ends of the third side line 23, respectively.
As shown in fig. 2, for convenience of description, an intersection of the first side line 21 and the fourth side line 24 is set as a first lower corner region 25, and an intersection of the first side line 21 and the third side line 23 is set as a first upper corner region 26. The intersection of the second side line 22 and the fourth side line 24 is set as a second lower corner region 27, and the intersection of the second side line 22 and the third side line 23 is set as a second upper corner region 28.
A first arc outer chamfer is formed at the intersection of the first sideline 21 and the second sideline 22 with the two ends of the fourth sideline 24. I.e. the first lower corner region 25 and the second lower corner region 27 are provided with a first rounded outer chamfer.
In one embodiment, both ends of the third sideline 23 respectively intersect with the first sideline 21 and the second sideline 22, and a second arc chamfer is provided, i.e. the first upper corner region 26 and the second upper corner region 28 are both provided with a second arc chamfer.
When the pole is rolled, if the second upper corner area 28 enters the roll first, the second circular arc chamfer of the second upper corner area 28 is easier to realize that the pole ear is pasted with the roll, and the pole ear is prevented from being folded. If the first lower corner area 25 enters the roller first, the lug with the inclined quadrilateral structure is easier to stick to the roller, and the lug is prevented from being folded.
The first side line 21 and the fourth side line 24 form a first included angle theta 1, the first included angle theta 1 is an acute angle, the second side line 22 and the fourth side line 24 form a second included angle theta 2, and the second included angle theta 2 is an obtuse angle.
In one embodiment, the first edge line 21 is parallel to the second edge line 22. That is, the sum of the first included angle θ 1 and the second included angle θ 2 is 180 °.
In one embodiment, when the die cutting tape-out direction is opposite to the direction shown in fig. 1, the tab 20 is not inclined to the right as shown in fig. 2, but inclined to the left. The first included angle θ 1 formed by the corresponding first side line 21 and the fourth side line 24 is an obtuse angle, and the second included angle θ 2 formed by the corresponding second side line 22 and the fourth side line 24 is an acute angle.
In one embodiment, the spatial extension of the first edge line 21 intersects the spatial extension of the second edge line 22. I.e. the first edge line 21 is non-parallel to the second edge line 22. Of course, the first included angle θ 1 is always an acute angle and the second included angle θ 2 is always an obtuse angle in this embodiment, that is, the first side line 21 and the second side line 22 are always inclined and the inclined directions are the same, for example, the first side line 21 and the second side line 22 are both inclined toward the die cutting tape running direction, or the first side line 21 and the second side line 22 are both inclined toward the opposite die cutting tape running direction.
As shown in FIG. 2, in one embodiment, the length H1 of the fourth side line 24 is 40 + -1 mm.
The utility model also provides a secondary battery electricity core, be in including positive plate, negative pole piece and setting the positive plate with diaphragm between the negative pole piece, the positive plate with the negative pole piece all includes the many utmost point ear pole pieces of above-mentioned arbitrary embodiment.
As shown in fig. 3, in one embodiment, the tabs of the positive and negative electrode tabs are inclined outward of the winding core of the secondary battery cell.
Wherein, the height H2 of the tab of the positive plate and the tab of the negative plate is 27.5 +/-1 mm; in order to ensure the safety of the battery, the distance L1 between the tab of the positive plate and the tab of the negative plate is 16-20mm, or L1 is 18 +/-2 mm. And the distance L2 between the tab of the positive plate or the tab of the negative plate and the outer edge of the winding core of the secondary battery cell is more than or equal to 5 mm.
When the inclination direction of the lug is consistent with the die-cutting tape-feeding direction, the secondary battery cell rolls up the core forming back, and the lug faces the outside of the roll core of the secondary battery cell is inclined.
As shown in fig. 4, in an embodiment, when the inclination direction of the tab is opposite to the direction of the die cutting tape, after the secondary battery cell core is formed, the tabs of the positive electrode sheet and the negative electrode sheet are inclined toward the inside of the core of the secondary battery cell.
Wherein, the height H3 of the tab of the positive plate and the tab of the negative plate is 27.5 +/-1 mm; in order to ensure the safety of the battery, the distance L3 between the electrode lug of the positive plate and the electrode lug of the negative plate is 16-20mm, or L3 is 18 +/-2 mm. And the distance L4 between the tab of the positive plate or the tab of the negative plate and the outer edge of the winding core of the secondary battery cell is more than or equal to 5 mm.
Based on the same inventive concept, the utility model discloses still provide a battery, including the secondary battery electric core of aluminium shell and above-mentioned arbitrary embodiment, the aluminium shell surrounds the secondary battery electric core.
The secondary battery cell includes a lithium battery cell.
Through setting up utmost point ear into the parallelogram structure that inclines, make utmost point ear cross the roller or the rolling in-process, increased the roller length of crossing of utmost point ear, utmost point ear crosses the roller area and increases earlier afterwards and subtracts, has alleviated utmost point ear atress condition, has reduced the phenomenon of crumpling because of the atress inequality causes. Utmost point ear is at the downward in-process of buckling, and the utmost point ear of slope quadrangle structure can realize the stress dispersion of its root, optimizes utmost point ear root atress condition, solves to roll up the core and close the electric core short circuit problem that the root infolding that core arouses because of crescent fold when going into the shell.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
It is noted that, in the present invention, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of the invention and is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multi-tab pole piece comprises a pole piece body and a plurality of tabs which are sequentially arranged in a coating area of the pole piece body along the length direction of the pole piece body, and is characterized in that each tab is of an inclined quadrilateral structure and comprises a first edge line, a second edge line, a third edge line and a fourth edge line, the fourth edge line is located in the coating area, the third edge line and the fourth edge line are oppositely arranged and far away from the coating area, the first edge line and the second edge line are oppositely arranged, the lower ends of the first edge line and the second edge line are respectively intersected with the two ends of the fourth edge line, a first arc outer chamfer is formed at the intersection, and the upper ends of the first edge line and the second edge line are respectively intersected with the two ends of the third edge line.
2. The multi-tab pole piece of claim 1 wherein the first edge line and the fourth edge line form a first included angle, the first included angle is an acute angle or an obtuse angle, the second edge line and the fourth edge line form a second included angle, and the second included angle is an obtuse angle or an acute angle.
3. The multi-tab pole piece of claim 1 wherein the first edge is parallel to the second edge.
4. The multi-tab pole piece of claim 1 wherein the spatial extension of the first edge intersects the spatial extension of the second edge.
5. The multi-tab pole piece of claim 1, wherein a second arc chamfer is provided at the intersection of the two ends of the third edge with the first edge and the second edge respectively.
6. The multi-tab pole piece of claim 1 wherein the plurality of tabs are symmetrically disposed on both sides of the pole piece body.
7. A secondary battery cell, comprising a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and the negative plate both comprise the multi-tab plate of any one of claims 1 to 6.
8. The secondary battery cell of claim 7,
the tabs of the positive plate and the negative plate are inclined towards the outside of the winding core of the secondary battery cell; or
And the polar lugs of the positive plate and the negative plate incline towards the interior of the winding core of the secondary battery cell.
9. The secondary battery cell of claim 7, wherein the distance between the tab of the positive plate and the tab of the negative plate is 16-20mm, and the distance between the tab of the positive plate or the tab of the negative plate and the outer edge of the winding core of the secondary battery cell is greater than or equal to 5 mm.
10. A battery comprising an aluminum can and the secondary battery cell of any of claims 7 to 9, the aluminum can surrounding the secondary battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220866538.0U CN217507590U (en) | 2022-04-14 | 2022-04-14 | Multi-tab pole piece, secondary battery cell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220866538.0U CN217507590U (en) | 2022-04-14 | 2022-04-14 | Multi-tab pole piece, secondary battery cell and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217507590U true CN217507590U (en) | 2022-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220866538.0U Active CN217507590U (en) | 2022-04-14 | 2022-04-14 | Multi-tab pole piece, secondary battery cell and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217507590U (en) |
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2022
- 2022-04-14 CN CN202220866538.0U patent/CN217507590U/en active Active
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