CN220138637U - Full-lug folding pole piece, battery cell and cylindrical battery - Google Patents
Full-lug folding pole piece, battery cell and cylindrical battery Download PDFInfo
- Publication number
- CN220138637U CN220138637U CN202321553044.8U CN202321553044U CN220138637U CN 220138637 U CN220138637 U CN 220138637U CN 202321553044 U CN202321553044 U CN 202321553044U CN 220138637 U CN220138637 U CN 220138637U
- Authority
- CN
- China
- Prior art keywords
- pole piece
- folded
- battery
- tab
- cylindrical battery
- 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
- 239000011248 coating agent Substances 0.000 claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 26
- 239000011888 foil Substances 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims 2
- 239000003792 electrolyte Substances 0.000 abstract description 10
- 238000004804 winding Methods 0.000 abstract description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 239000013543 active substance Substances 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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
Abstract
The utility model discloses a full-tab folded pole piece, an electric core and a cylindrical battery, and belongs to the technical field of lithium batteries. The battery cell is manufactured by winding the pole piece. The cylindrical battery comprises the electric core. According to the utility model, after the folded part of the pole piece is wound, gaps are still reserved among the formed pole lugs to be filled with electrolyte, and the direction of the free ends of the pole lugs is away from the coating area, so that the problem that burrs are easy to contact with pole piece active substances to generate short circuit after the hollow foil area of the battery core of the cylindrical battery is folded is solved, and meanwhile, the electrolyte in the battery core is fully soaked is ensured.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a full-lug folding pole piece, an electric core and a cylindrical battery.
Background
At present, after a battery core of a cylindrical lithium ion battery is wound, operations such as flattening, cutting, stacking, shaping and the like are required, so that lugs at the end surfaces of two ends of the battery core are tightly contacted, the battery core is in an approximately closed state, and the problem of difficult liquid injection infiltration after the battery core is put into a shell is caused; however, if the tabs are not kneaded and shaped, the tabs cannot be integrally collected together, and when the current collecting plate is welded on the tabs, the thickness of the foil of the tabs is thinner, so that the current collecting plate cannot be supported.
In addition, when welding, the pressure applied on the end part of the tab by the current collecting disc is changed, so that the welding firmness can be improved, however, the applied pressure is too high to damage the electrode material coating, the electrode material coating cannot be collected and gathered and closely contacted between the tabs, and the welding is unstable or the current collecting disc is welded through easily due to the fact that the pressure is small.
Therefore, in the production of the cylindrical lithium battery, the collecting and closely contacting of the electrode lugs are required, loose and porous end faces of the electrode lugs are required to be ensured, and a channel is provided for the electrolyte to permeate into the battery core, so that the electrolyte can infiltrate the winding core better, and the situation puts high requirements on the production process of the cylindrical lithium battery.
The traditional Chinese patent document with the publication number of CN114050326A discloses a processing method of a cylindrical lithium ion battery cell lug, which comprises a full lug cylindrical roll core, wherein the inside of the full lug cylindrical roll core comprises a positive lug, a negative lug, a positive plate, a negative plate, a diaphragm and ending stop glue, and the positive lug and the negative lug are formed by extending positive and negative current collectors out of the diaphragm for a certain length; the inventor of this scheme still can produce the clearance between each other through folding the empty foil area of pole piece for the utmost point ear after the plastic, has solved the infiltration problem of electrolyte to a certain extent.
However, the above-described scheme has the following problems: after the empty foil area of the pole piece is folded, the edge of the foil is towards the direction of the winding core, so that burrs at the edge of the foil are easily contacted with pole piece active substances when the tab is pressed to weld the current collecting disc, and the problem of short circuit of the battery core is generated.
In view of this, there is a need for improvements in the cell structure of existing cylindrical batteries.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a full-lug folded pole piece, an electric core and a cylindrical battery, so as to solve the problem that burrs are easy to contact pole piece active substances to generate short circuit after an electric core empty foil area of the cylindrical battery is folded, and simultaneously ensure that electrolyte in the electric core is fully soaked.
The utility model discloses a full-tab folded pole piece, which comprises a coating area and an empty foil area, wherein the empty foil area is provided with a folding part, the folding part is formed by folding for an even number of times, the folding part comprises a first bending part, a second bending part and a free end, and the free end faces to the outer side of the pole piece and is deviated from the coating area.
Preferably, the inner periphery of the first bending part faces the coating area, and the inner periphery Zhou Bei of the second bending part faces the coating area.
Preferably, one or both sides of the coating zone are provided with an active coating.
Preferably, the first and second bent portions form a zigzag structure.
The utility model discloses an electric core which is manufactured by winding any one of the pole pieces.
Preferably, the pole piece comprises a positive pole piece and a negative pole piece, wherein the folding part of the positive pole piece is wound to form a positive pole lug, and the folding part of the negative pole piece is wound to form a negative pole lug.
Preferably, the battery cell comprises a diaphragm, the positive pole piece and the negative pole piece are sequentially arranged at intervals, and the diaphragm is arranged between the positive pole piece and the negative pole piece.
The utility model discloses a cylindrical battery, which comprises any one of the battery cells.
Preferably, the cylindrical battery comprises a current collecting disc, the current collecting disc comprises a positive current collecting disc, and the positive current collecting disc is welded on the positive electrode tab.
Preferably, the current collecting disc comprises a negative current collecting disc, and the negative current collecting disc is welded on the negative electrode tab.
The utility model has the beneficial effects that:
on the one hand, as the edge of the pole piece is provided with the folded part which is bent twice, after the pole piece is wound to form the battery cell and the folded part is wound to form the pole lug, gaps are still reserved between the shaped adjacent folded parts for electrolyte to remain, so that the whole battery cell can be fully soaked by the electrolyte, and the reliability of discharging the battery cell is ensured;
on the other hand, as the free end of the folding part is away from the coating area, burrs on the edge of the pole piece, namely the free end, cannot enter the inside of the winding core under the use of pressure when the battery cell is welded with the current collecting disc, so that the risk of short circuit inside the battery cell when the current collecting disc is welded is greatly reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
FIG. 1 is a schematic overall structure of a pole piece, and a front view perspective;
fig. 2 is a schematic overall structure of the pole piece, and is a side view.
Reference numerals illustrate: 1. a pole piece; 101. a coating zone; 102. an empty foil region; 11. a reactive coating; 12. a folding part; 121. a first bending part; 122. a second bending part; 123. a free end.
Detailed Description
Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified schematic manner.
It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the "first", "second", etc. in this application are for descriptive purposes only and are not intended to specifically indicate a sequential or a cis-position, nor are they intended to limit the utility model, but are merely intended to distinguish between components or operations described in the same technical term, and are not to be construed as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1 and 2, for a full tab folded pole piece disclosed in the utility model, the pole piece 1 comprises a coating area 101 and an empty foil area 102 along the width direction, one or both sides of the coating area 101 are provided with an active coating 11, the active coating 11 is used for realizing electron migration and ion exchange, and the empty foil area 102 is used for being connected as a tab and a current collecting disc after the pole piece 1 is wound into a battery core.
Referring to fig. 1 and 2, the empty foil region 102 includes one side edge of the pole piece 1, the edge of the empty foil region 102 is provided with a folded portion 12, the folded portion 12 is formed by two or even number of folds, including a first folded portion 121, a second folded portion 122 and a free end 123, the first folded portion 121 is closer to the inner side of the pole piece 1 than the second folded portion 122, and the inner periphery of the first folded portion 121 faces the coating region 101, the inner Zhou Bei of the second folded portion 122 faces the coating region 101, the first folded portion 121 and the second folded portion 122 form a "Z" shaped structure in the case that the folded portion 12 is folded twice, and the plurality of first folded portions 121 and the plurality of second folded portions 122 form a plurality of continuous "Z" shaped wavy structures in the case that the folded portion 12 is folded by other even number of times; the free end 123 is the outermost edge of the blank foil region 102, no matter how many folds the fold 12 has, and the free end 123 faces the outside of the pole piece 1, away from the coating region 101.
Referring to fig. 1 and 2, the utility model discloses a battery cell, the battery cell is manufactured by winding the full-tab folded pole piece 1, the pole piece 1 comprises a positive pole piece 1 and a negative pole piece 1, the folded part 12 of the positive pole piece 1 forms a positive pole tab after winding, the folded part 12 of the negative pole piece 1 forms a negative pole tab after winding, the positive pole piece 1 and the negative pole piece 1 are sequentially arranged at intervals, the battery cell further comprises a diaphragm, and the diaphragm is arranged between the adjacent positive pole piece 1 and the negative pole piece 1.
Referring to fig. 1 and 2, the utility model further discloses a cylindrical battery, the cylindrical battery adopts the battery core, and the cylindrical battery further comprises a current collecting disc, wherein the current collecting disc comprises an anode current collecting disc and a cathode current collecting disc, the anode current collecting disc is fixedly connected to an anode tab in a laser penetration welding mode, and the cathode current collecting disc is fixedly connected to a cathode tab in a laser penetration welding mode.
The implementation principle and the beneficial effects of the utility model are as follows:
on the one hand, as the edge of the pole piece 1 is provided with the folded part 12 which is bent twice, after the pole piece 1 is wound to form a battery core and the folded part 12 is wound to form a pole lug, gaps are still reserved between the adjacent folded parts 12 which are shaped for electrolyte to remain, so that the whole battery core can be fully soaked by the electrolyte, and the reliability of discharging the battery core is ensured;
on the other hand, since the free end 123 of the folded portion 12 faces away from the coating area 101, burrs on the edge of the pole piece 1, i.e. the free end 123, do not enter the interior of the winding core under pressure when the battery cell is welded with the current collecting disc, so that the risk of short circuit inside the battery cell when the current collecting disc is welded is greatly reduced.
The above is merely an embodiment of the present utility model, and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.
Claims (10)
1. The utility model provides a full tab folding pole piece, its characterized in that, pole piece (1) is including coating district (101) and empty foil district (102), empty foil district (102) are provided with folding portion (12), folding portion (12) are formed through even number folding, including first bending portion (121), second bending portion (122) and free end (123), free end (123) orientation pole piece (1) outside, with coating district (101) deviate from mutually.
2. The full tab folded pole piece of claim 1, wherein an inner periphery of the first fold (121) faces the coating region (101) and an inner Zhou Bei of the second fold (122) faces the coating region (101).
3. The full tab folded pole piece according to claim 1 or 2, characterized in that one or both sides of the coating zone (101) are provided with an active coating (11).
4. The full tab folded pole piece according to claim 1 or 2, wherein the first and second folded portions (121, 122) form a "Z" -shaped structure.
5. A battery cell, characterized in that it is wound with a pole piece (1) according to any one of claims 1-4.
6. The cell according to claim 5, wherein the electrode sheet (1) comprises a positive electrode sheet (1) and a negative electrode sheet (1), the folded portion (12) of the positive electrode sheet (1) is wound to form a positive electrode tab, and the folded portion (12) of the negative electrode sheet (1) is wound to form a negative electrode tab.
7. The cell according to claim 6, characterized in that the cell comprises a membrane, the positive pole piece (1) and the negative pole piece (1) are arranged at intervals in sequence, the membrane being arranged between the positive pole piece (1) and the negative pole piece (1).
8. A cylindrical battery comprising a cell according to any one of claims 5-7.
9. The cylindrical battery of claim 8, wherein the cylindrical battery comprises a current collecting plate comprising a positive current collecting plate welded to the positive tab.
10. The cylindrical battery of claim 8, wherein the cylindrical battery comprises a current collecting plate comprising a negative current collecting plate welded to the negative tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321553044.8U CN220138637U (en) | 2023-06-16 | 2023-06-16 | Full-lug folding pole piece, battery cell and cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321553044.8U CN220138637U (en) | 2023-06-16 | 2023-06-16 | Full-lug folding pole piece, battery cell and cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220138637U true CN220138637U (en) | 2023-12-05 |
Family
ID=88960147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321553044.8U Active CN220138637U (en) | 2023-06-16 | 2023-06-16 | Full-lug folding pole piece, battery cell and cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220138637U (en) |
-
2023
- 2023-06-16 CN CN202321553044.8U patent/CN220138637U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113193165B (en) | Tab pole piece and winding battery | |
| CN106463761B (en) | Winding type battery | |
| JP5583421B2 (en) | Square sealed secondary battery and method for manufacturing square sealed secondary battery | |
| CN111668451A (en) | Preparation method of pole piece for winding type multi-tab battery cell, pole piece and battery cell | |
| CN103155226A (en) | Integral battery tab | |
| CN218385635U (en) | Electrode plate, battery cell and button cell | |
| CN211208575U (en) | Secondary battery cell | |
| CN220138637U (en) | Full-lug folding pole piece, battery cell and cylindrical battery | |
| CN218849723U (en) | Lithium ion battery | |
| CN215771249U (en) | Lithium ion battery and vehicle comprising same | |
| CN114388743B (en) | Optimized preparation method of cylindrical lithium ion battery pole group | |
| CN108258327A (en) | Laminated lithium ion battery core and its assemble method and the laminated lithium ion battery for including laminated lithium ion battery core | |
| CN212461774U (en) | Parallel type winding core structure of cylindrical battery | |
| CN112072162A (en) | Cylindrical battery parallel type roll core structure and manufacturing process thereof | |
| CN113793972A (en) | Battery and preparation method thereof | |
| CN112928402A (en) | Battery core and battery | |
| CN218957772U (en) | Battery pole piece, battery and electric vehicle | |
| CN112038706B (en) | Lithium ion battery and roll core structure thereof | |
| CN218568943U (en) | Lithium ion battery roll core Structure and lithium ion battery | |
| CN211507750U (en) | Lithium battery pole plate end face structure | |
| CN217134462U (en) | Lithium battery with tab middle-arranged welding structure | |
| CN220066034U (en) | Battery cell | |
| CN218769610U (en) | Pole piece, roll core and lithium ion battery for improving corner lithium separation | |
| CN220963675U (en) | Positive electrode current collecting disc and cylindrical battery | |
| JP4977932B2 (en) | Lithium ion secondary battery and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |