CN217648992U - Pole piece rolling assembly, pole piece rolling device and pole piece assembly - Google Patents
Pole piece rolling assembly, pole piece rolling device and pole piece assembly Download PDFInfo
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- CN217648992U CN217648992U CN202221459499.9U CN202221459499U CN217648992U CN 217648992 U CN217648992 U CN 217648992U CN 202221459499 U CN202221459499 U CN 202221459499U CN 217648992 U CN217648992 U CN 217648992U
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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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Abstract
The utility model provides a pole piece roll-in subassembly, pole piece roll-in device and pole piece subassembly, wherein, pole piece roll-in subassembly is including being used for a pair of positive plate compression roller to the pole piece roll-in to and be used for a pair of negative pole piece compression roller to the negative pole piece roll-in, wherein, the outer peripheral face diameter of positive plate compression roller is little-and-little setting gradually by the middle part of positive plate compression roller to both ends, and the outer peripheral face diameter of negative pole piece compression roller is big-and-big setting gradually by the middle part of negative pole piece compression roller to both ends. Pole piece roll-in subassembly, based on the shape setting of positive plate compression roller and negative pole piece compression roller, the positive plate is thin in the middle of presenting, the thick shape in edge, the negative pole piece is thick in the middle of presenting, the thin shape in edge, the little middle part of the little thickness of intermediate part correspondence positive plate's of the little thickness of compaction density of negative pole piece, the little edge part of the little thickness of negative pole piece compaction density corresponds the little edge part of the little thickness of positive plate compaction density, improve the lithium problem of analysing that causes because of electric core pole piece inflation.
Description
Technical Field
The utility model relates to a pole piece roll-in technical field, in particular to pole piece roll-in subassembly. The utility model discloses still relate to a pole piece roll-in device and pole piece subassembly.
Background
At present, lithium batteries are applied to various aspects of production and life in a large scale, and the demand of the fields of communication, energy storage, traffic and the like on the lithium batteries is increasingly vigorous. The production process of the lithium battery is mature day by day, and the production scale also enters an accelerated promotion stage. However, large-scale applications still fail to solve some of the persistent problems of lithium batteries in application. The mature production process only improves the production efficiency of the lithium battery, and the slight inconsistency of the lithium battery in the production process can be amplified in the use process due to the characteristics of the lithium battery, so that the use performance is even influenced, and even more, accidents are caused.
The problems of battery swelling, shell corrosion, capacity diving, foreign matters, black spots, lithium precipitation and even sudden thermal runaway are uniformly troubled the improvement work of the lithium battery production industry on the quality and safety of the battery.
In the manufacturing process of the battery, the anode slurry and the cathode slurry are uniformly coated on aluminum and copper foils serving as anode and cathode current collectors according to a certain amount, the solvent in the slurry is removed through high-temperature baking, and the pole piece is uniform in thickness and smooth in surface through rolling. Then, the single positive and negative plates are manufactured through the working procedures of slitting, die cutting, laser cutting and the like. The rolling procedure can effectively reduce the thickness of the positive and negative pole pieces, so that the internal space of the single battery core occupied by the pole pieces is as small as possible, the charge and discharge capacity of the positive and negative pole pieces is not influenced, and the energy density of the battery can be greatly improved.
However, in the rolling process, the rolling pressure is too low, and the pole piece is too thick, so that the energy density of the battery is reduced. The battery negative electrode expands after lithium is embedded, and the decomposition and gas generation of the electrolyte can cause the overall swelling of the battery. The severe expansion can also cause the pole piece to be stressed too much, the liquid retention capacity of the diaphragm is reduced, and further lithium precipitation is generated.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a pole piece rolling assembly to improve the lithium precipitation problem caused by the expansion of the cell pole piece.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
the utility model provides a pole piece roll-in subassembly, is including being used for a pair of positive plate compression roller to the pole piece roll-in to and be used for a pair of negative plate compression roller to the negative plate roll-in, wherein, the outer peripheral face diameter of positive plate compression roller by the middle part of positive plate compression roller is little-gradually setting to both ends, the outer peripheral face diameter of negative plate compression roller by the middle part of negative plate compression roller is big-gradually setting to both ends.
Furthermore, the difference delta R between the maximum diameter and the minimum diameter of the peripheral surface of the positive plate compression roller Is just Between 10 and 60 μm.
Furthermore, the difference between the maximum diameter and the minimum diameter of the peripheral surface of the negative plate pressing roller is within delta R Negative pole 10-60 μm.
Furthermore, the projections of the contours of the outer peripheral surfaces of the positive plate pressing roller and the negative plate pressing roller on the central symmetry plane are in smooth transition from the middle part to the two ends.
Further, the positive plate pressing roller and/or the negative plate pressing roller comprise a core roller and a roller sleeve, and the core roller is embedded in the roller sleeve.
Furthermore, the core roller is cylindrical, a radial limiting structure is arranged between the core roller and the roller sleeve, and the radial limiting structure is used for limiting the relative rotation between the core roller and the roller sleeve.
Furthermore, the limiting structure comprises a limiting bulge arranged on the outer peripheral surface of the core roller and a limiting groove arranged on the inner wall of the roller sleeve, and the limiting bulge is limited in the limiting groove.
Further, the length L of the roller sleeve is between 50mm and 700 mm.
Compared with the prior art, the utility model discloses following advantage has:
the utility model discloses a pole piece roll-in subassembly, based on the shape setting of positive plate compression roller and negative pole piece compression roller, just, the negative pole piece is through the roll-in back, the positive plate is thin in the middle of appearing, the thick shape in edge, the negative pole piece is thick in the middle of appearing, the thin shape in edge, the little middle part that thickness is big of the little thickness of compaction density of negative pole piece, can correspond the big middle part that thickness is little of the compaction density of positive plate, the little negative pole of compaction density imbeds lithium ion when charging and discharging and then the expansion change is less to improve pole piece central expansion problem and because of the central lithium problem of separating out that the inflation caused; the edge part with large compacted density and small thickness of the negative pole piece can correspond to the edge part with small compacted density and large thickness of the positive pole piece, and the negative pole with large compacted density has large expansion change during charging so as to improve the problem of lithium precipitation at the edge caused by poor fitting of the edge of the pole piece.
Another object of the utility model is to provide a pole piece roll-in device, this pole piece roll-in device is last to be equipped with as above the pole piece roll-in subassembly in a pair of negative pole piece compression roller, perhaps a pair of positive plate compression roller.
The utility model discloses a pole piece roll-in device with as above pole piece roll-in subassembly has the same beneficial effect for prior art, no longer gives unnecessary details here.
The utility model also provides a pole piece subassembly, including positive plate and negative pole piece, it is a pair of that the positive plate has through among the pole piece rolling device roll-in forms the positive plate compression roller, it is a pair of that the negative pole piece has through among the pole piece rolling device the negative pole piece compression roller the pole piece rolling device roll-in forms.
The utility model discloses a pole piece subassembly, positive, negative pole piece and the stopping nature between the diaphragm and alignment degree when can improving the lamination improve the bad lithium problem of analysing that leads to of pole piece laminating.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic structural view of a positive plate compression roller according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a negative plate compression roller according to a first embodiment of the present invention;
fig. 3 is a schematic structural view of the positive plate rolled by the positive plate pressing roller according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of the negative electrode sheet rolled by the negative electrode sheet pressing roller according to the first embodiment of the present invention;
fig. 5 is a schematic diagram of stacking of the positive and negative electrode plates and the diaphragm according to the third embodiment of the present invention.
Description of reference numerals:
1. pressing the positive plate; 10. a positive plate core roller; 100. a limiting bulge; 11. a positive plate roller sleeve; 110. a limiting groove; 2. a negative plate compression roller; 20. a negative plate core roller; 21. a negative plate roller sleeve; 3. a positive plate; 4. a negative plate; 5. a diaphragm.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and 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. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The embodiment relates to a pole piece roll-in subassembly, including being used for a pair of positive plate compression roller 1 to 3 roll-ins of positive plate to and be used for a pair of negative plate compression roller 2 to 4 roll-ins of negative plate, wherein, the outer peripheral face diameter of positive plate compression roller 1 is the little setting gradually to both ends by the middle part of positive plate compression roller 1, and the outer peripheral face diameter of negative plate compression roller 2 is the big setting gradually to both ends by the middle part of negative plate compression roller 2.
According to the structure, based on the shape arrangement of the positive plate compression roller 1 and the negative plate compression roller 2, after the positive plate 4 and the negative plate 4 are rolled, the positive plate 3 is thin in the middle and thick at the edge, the negative plate 4 is thick in the middle and thin at the edge, the middle part of the negative plate 4 with small compaction density and large thickness can correspond to the middle part of the positive plate 3 with large compaction density and small compaction thickness, and the negative electrode with small compaction density is less in expansion change after lithium ions are embedded in the negative electrode during charging and discharging so as to improve the central expansion problem of the plate and the central lithium separation problem caused by expansion; the edge part with large compacted density and small thickness of the negative plate 4 can correspond to the edge part with small compacted density and large thickness of the positive plate 3, and the negative expansion change with large compacted density is large during charging, so that the problem of lithium precipitation at the edge caused by poor fitting of the edge of the plate is solved.
Based on the above overall design, an exemplary structure of the pole piece rolling assembly of the present embodiment is shown in fig. 1 and fig. 2, and it should be noted that, for a single positive pole piece 3 and negative pole piece 4, the compaction of each part (weight of positive or negative pole material per unit thickness of the positive pole piece) is substantially uniform, and lithium ions are expanded and contracted due to extraction or insertion during charging and discharging. Generally, the middle portion of the pole piece having a large compacted density and a small thickness expands more when lithium ions are inserted, and the edge portion of the pole piece having a small compacted density and a large thickness expands less when lithium ions are inserted.
Specifically, the difference Δ R between the maximum diameter and the minimum diameter of the outer peripheral surface of the positive electrode sheet pressing roll 1 Is just The difference delta R between the maximum diameter and the minimum diameter of the peripheral surface of the negative plate pressing roller 2 is between 10 and 60 mu m Negative pole Between 10 and 60 μm. For example, 20 μm, 30 μm, 40 μm, 50 μm, etc., can be selected, and the specific values can be adapted according to the compaction requirements.
In addition, the projections of the outer peripheral surface contours of the positive plate pressing roller 1 and the negative plate pressing roller 2 on the central symmetry plane are in smooth transition from the middle part to the two ends. It can be understood that the central position of the outer peripheral surface profile of the positive plate pressing roller 1 and the negative plate pressing roller 2 is a rounded corner to improve the rolling effect on the pole piece.
In this embodiment, the positive plate pressing roller 1 includes a positive plate core roller 10 and a positive plate roller sleeve 11, the negative plate pressing roller 2 includes a negative plate core roller 20 and a negative plate roller sleeve 21, and the positive plate core roller 10 and the negative plate core roller 20 are respectively embedded and set to be located in the corresponding positive plate roller sleeve 11 and the corresponding negative plate roller sleeve 21. By the arrangement, the anode plate roller sleeve 10 and the cathode plate roller sleeve 21 with different radius difference values can be replaced according to different compaction effects.
In order to ensure that the roller sleeve can rotate along with the core roller, the core roller is cylindrical, and a radial limiting structure is arranged between the core roller and the roller sleeve and used for limiting the relative rotation between the core roller and the roller sleeve. Specifically, the limiting structure comprises a limiting protrusion 100 arranged on the outer peripheral surface of the core roller and a limiting groove 110 arranged on the inner wall of the roller sleeve, and the limiting protrusion 100 is limited in the limiting groove 110. When the core roller and the roller sleeve are sleeved, the limiting protrusions 100 are aligned with the limiting grooves 110, and the core roller is inserted into the limiting grooves.
In addition, the length L of the roller sleeve is between 50mm and 700mm, and the length L of the roller sleeve can be selected according to different requirements on the width of the pole piece, and can be 60mm, 150mm, 230mm, 420mm, 560mm and the like.
Example two
The present embodiment relates to a pole piece rolling device, which is provided with a pair of negative pole piece pressing rollers 2 or a pair of positive pole piece pressing rollers 1 in the pole piece rolling assembly according to the first embodiment. As shown in fig. 3 and 4, the positive electrode sheet 3 rolled by the positive electrode sheet pressing roller 1 has a thin middle portion and a thick edge portion, and the negative electrode sheet 4 rolled by the negative electrode sheet pressing roller 2 has a thick middle portion and a thin edge portion.
In the pole piece rolling device of the embodiment, the middle part of the negative pole piece 4 with small compaction density and large thickness can correspond to the middle part of the positive pole piece 3 with large compaction density and small thickness, and the negative pole with small compaction density is less in expansion change after being embedded with lithium ions during charging and discharging so as to improve the central expansion problem of the pole piece and the central lithium precipitation problem caused by expansion; the edge part of the negative plate 4 with large compaction density and small thickness can correspond to the edge part of the positive plate 3 with small compaction density and large thickness, and the negative expansion change with large compaction density is large during charging, so that the problem of lithium precipitation at the edge caused by poor fitting of the edge of the plate is solved.
EXAMPLE III
The embodiment relates to a pole piece assembly, which refers to fig. 5 and comprises a positive pole piece 3 and a negative pole piece 4, wherein the positive pole piece 3 is formed by rolling a pole piece rolling device with a pair of positive pole piece pressing rollers 1 in the pole piece rolling device, and the negative pole piece 4 is formed by rolling a pole piece rolling device with a pair of negative pole piece pressing rollers 2 in the pole piece rolling device.
In the pole piece assembly of the embodiment, after the positive pole piece 3, the diaphragm 5 and the negative pole piece 4 are stacked together in sequence, the thickness of the pole piece assembly is consistent with that of a common plane rolling pole piece, the locking performance and the alignment degree between the positive pole piece 4 and the negative pole piece 5 during lamination can be improved, and the problem of lithium precipitation caused by poor pole piece lamination is solved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pole piece roll-in subassembly which characterized in that: including being used for a pair of positive plate compression roller (1) to positive plate (3) roll-in to and be used for a pair of negative pole piece compression roller (2) to negative pole piece (4) roll-in, wherein, the outer peripheral face diameter of positive plate compression roller (1) by the middle part of positive plate compression roller (1) is to the both ends and gradually diminishes the setting, the outer peripheral face diameter of negative pole piece compression roller (2) by the middle part of negative pole piece compression roller (2) is to the both ends and gradually enlarges the setting.
2. The pole piece roll assembly of claim 1, wherein:
the difference delta R between the maximum diameter and the minimum diameter of the peripheral surface of the positive plate pressing roller (1) Is just for Between 10 and 60 μm.
3. The pole piece roll assembly of claim 1, wherein:
the difference delta R between the maximum diameter and the minimum diameter of the peripheral surface of the negative plate pressing roller (2) Negative pole Between 10 and 60 μm.
4. The pole piece roll assembly of claim 1, wherein:
the projection of the outer peripheral surface contours of the positive plate pressing roller (1) and the negative plate pressing roller (2) on the central symmetry plane is in smooth transition from the middle part to the two ends.
5. The pole piece roll assembly of any one of claims 1 to 4, wherein:
the positive plate pressing roller (1) and/or the negative plate pressing roller (2) comprise a core roller and a roller sleeve, and the core roller is embedded and set to be located in the roller sleeve.
6. The pole piece roll assembly of claim 5, wherein:
the core roller is cylindrical, a radial limiting structure is arranged between the core roller and the roller sleeve, and the radial limiting structure is used for limiting the relative rotation between the core roller and the roller sleeve.
7. The pole piece roll assembly of claim 6, wherein:
the limiting structure comprises a limiting bulge (100) arranged on the outer peripheral surface of the core roller and a limiting groove (110) arranged on the inner wall of the roller sleeve, and the limiting bulge (100) is limited in the limiting groove (110).
8. The pole piece roll assembly of claim 5, wherein:
the length L of the roller sleeve is between 50mm and 700 mm.
9. A pole piece rolling device is characterized in that; the pole piece rolling device is provided with a pair of the negative pole piece pressing rollers (2) or a pair of the positive pole piece pressing rollers (1) in the pole piece rolling assembly of any one of claims 1 to 8.
10. A pole piece assembly comprises a positive pole piece (3) and a negative pole piece (4), and is characterized in that: the positive plate (3) is formed by rolling the plate rolling device with a pair of the positive plate pressing rollers (1) in claim 9, and the negative plate (4) is formed by rolling the plate rolling device with a pair of the negative plate pressing rollers (2) in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221459499.9U CN217648992U (en) | 2022-06-10 | 2022-06-10 | Pole piece rolling assembly, pole piece rolling device and pole piece assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221459499.9U CN217648992U (en) | 2022-06-10 | 2022-06-10 | Pole piece rolling assembly, pole piece rolling device and pole piece assembly |
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| CN217648992U true CN217648992U (en) | 2022-10-25 |
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| CN202221459499.9U Active CN217648992U (en) | 2022-06-10 | 2022-06-10 | Pole piece rolling assembly, pole piece rolling device and pole piece assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110899336A (en) * | 2019-11-29 | 2020-03-24 | 四川新敏雅电池科技有限公司 | Rolling mechanism and roller design method |
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- 2022-06-10 CN CN202221459499.9U patent/CN217648992U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110899336A (en) * | 2019-11-29 | 2020-03-24 | 四川新敏雅电池科技有限公司 | Rolling mechanism and roller design method |
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