CN220138344U - Pole piece structure and electric core for improving electrolyte wettability - Google Patents
Pole piece structure and electric core for improving electrolyte wettability Download PDFInfo
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- CN220138344U CN220138344U CN202321150890.5U CN202321150890U CN220138344U CN 220138344 U CN220138344 U CN 220138344U CN 202321150890 U CN202321150890 U CN 202321150890U CN 220138344 U CN220138344 U CN 220138344U
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- pole piece
- coating
- electrolyte
- wettability
- planar
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 239000011247 coating layer Substances 0.000 claims description 10
- 230000008595 infiltration Effects 0.000 abstract description 14
- 238000001764 infiltration Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000011888 foil Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Abstract
The utility model relates to a pole piece structure for improving electrolyte wettability, which comprises a pole piece substrate, a planar coating arranged on the side surface of the pole piece substrate and a grid-shaped coating arranged on the planar coating; the plane coating is uniformly coated on the side surface of the pole piece substrate; the thickness of the plane coating is 30-150 mu m; the latticed coating comprises a plurality of bulges which are uniformly arranged; the thickness of the bulge is 30-100 mu m; when a plurality of bulges are positioned on the same horizontal line, a blank space is arranged between two adjacent bulges. The utility model further provides a battery cell. The utility model can effectively increase the contact area of the pole piece and the electrolyte, effectively improve the wettability of the pole piece, effectively shorten the infiltration time of the electrolyte, and reduce the risk of diaphragm wrinkling caused by gas production generated by battery formation.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a pole piece structure for improving electrolyte wettability and an electric core.
Background
The lithium ion battery has the characteristics of high voltage, high specific energy and long service life, and has wide application in industries such as new energy vehicles, energy storage, portable electronic equipment and the like. The electrolyte is an ion conductor which plays a role in conduction between the anode and the cathode of the lithium battery, and in the charging and discharging process, the electrolyte transmits lithium ions between the anode and the cathode, so that the electrolyte plays a vital role in the electrochemical performance of the lithium battery. In practical application, the infiltration effect of the electrolyte on the pole piece and the diaphragm not only affects the transmission distance of lithium ions, but also can cause the pole piece not to normally participate in the electrochemical reaction of the battery, and even can cause the problems of increased internal resistance, reduced capacity, short cycle life and the like of the battery.
At present, the improvement of electrolyte wettability is realized from the aspects of improving electrolyte, liquid injection technology, wettability of the pole piece and the like. Patent application CN115632111a discloses a method for improving wettability of a lithium ion battery, which comprises the steps of forming a micro-channel by carrying out laser etching on a lithium iron phosphate pole piece, implanting active carbon into the micro-channel, and improving the liquid absorption amount of the pole piece by utilizing the high specific surface area of the active carbon, so as to improve the wettability of the pole piece. However, the method has high operation difficulty and low success rate, and meanwhile, the pole piece can be damaged by high temperature generated by laser, and burrs of the pole piece can be increased.
Patent CN214123914U discloses a lithium battery pole piece for improving electrolyte infiltration, the pole piece is respectively composed of an active material layer and a bonding liquid absorbing layer, and the wettability is improved through the liquid absorbing layer. However, since the liquid absorbing layer is inactive, the method has a risk of uneven interface reaction, and it is difficult to meet the actual use requirement.
Disclosure of Invention
Based on the above, the embodiment of the utility model provides a pole piece structure and an electric core for improving electrolyte wettability, and aims to solve the technical problems of slow infiltration, poor infiltration of the center of a pole piece and the like of the existing pole piece. The utility model has simple structure, can contain more electrolyte, can increase the contact area of the pole piece and the electrolyte, improves the wettability of the pole piece (especially the middle part of the pole piece), shortens the infiltration time, and can reduce the risk of diaphragm wrinkling caused by gas production.
In order to achieve the above objective, in one aspect, an embodiment of the present utility model provides a pole piece structure for improving wettability of an electrolyte, including a pole piece substrate, a planar coating layer disposed on a side surface of the pole piece substrate, and a grid-like coating layer disposed on the planar coating layer;
the plane coating is uniformly coated on the side surface of the pole piece substrate; the thickness of the plane coating is 30-150 mu m;
the latticed coating comprises a plurality of bulges which are uniformly arranged; the thickness of the bulge is 30-100 mu m; when a plurality of bulges are positioned on the same horizontal line, a blank space is arranged between two adjacent bulges.
As a preferred embodiment, the blank space is arranged at intervals with the protrusions, and the plane area of the blank space is the same as that of the protrusions.
As a preferred embodiment, the length of each protrusion is 10mm to 5000mm; the length of each blank area is 10 mm-500 mm.
As a preferred embodiment, the thickness of the planar coating is the same as the thickness of the grid-like coating.
As a preferred embodiment, the protrusions are square protrusions; the blank area is a square blank area.
As a preferred embodiment, the planar coating is arranged on both sides of the pole piece substrate, and the grid-shaped coating is arranged on the planar coating. Thus, the pole piece substrate can be completely covered, thereby effectively avoiding the risk of short circuit caused by foil exposure.
In a preferred embodiment, the electrode sheet substrate is a positive electrode sheet substrate or a negative electrode sheet substrate.
On the other hand, the embodiment of the utility model also provides a battery cell, which comprises a plurality of positive plates, a diaphragm and a plurality of negative plates, wherein the diaphragm is arranged between the positive plates and the negative plates; the positive plate and the negative plate are both made of the plate structure for improving the wettability of the electrolyte.
As a preferred embodiment, the blank area of the positive electrode sheet is provided corresponding to the blank area of the negative electrode sheet.
In a preferred embodiment, the battery cell is a laminated battery cell or a wound battery cell.
According to the utility model, the grid-shaped coating is arranged on the two side surfaces of the pole piece substrate, and the protrusions and the depressions are formed between the plane coating and the grid-shaped coating, so that the pole piece can contain more electrolyte, the contact area of the pole piece for the electrolyte is effectively increased, and the wettability of the pole piece (particularly the middle part of the pole piece) is effectively improved; meanwhile, the infiltration time of the electrolyte can be effectively shortened, and the risk of diaphragm wrinkling caused by gas production in battery formation can be effectively reduced. The pole piece manufacturing device is simple in structure and easy to prepare, can effectively solve the problems of slow infiltration, poor infiltration of the center of the pole piece and the like of the existing pole piece, and can be used as a universal product for production and use.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a single-sided structure of a pole piece structure for improving electrolyte wettability according to an embodiment of the utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top, bottom … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. 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.
At present, the existing pole piece generally has the problems of slow infiltration, poor infiltration of the center of the pole piece and the like, and the actual use requirement is difficult to meet. Based on the above, the utility model provides a laminated cell series structure and a lithium ion battery to solve the above technical problems.
Specifically, in one aspect, as shown in fig. 1, an embodiment of the present utility model provides a pole piece structure for improving wettability of an electrolyte, including a pole piece substrate 10, a planar coating layer 20 disposed on a side surface of the pole piece substrate 10, and a grid-like coating layer 30 disposed on the planar coating layer 20;
the planar coating 20 is uniformly coated on the side surface of the pole piece substrate 10; the thickness of the planar coating layer 20 is 30 μm to 150 μm (30 μm, or 60 μm, or 100 μm, or 150 μm, etc. depending on the actual use requirements, in this embodiment, 100 μm);
the grid-like coating 30 includes a plurality of projections 31 uniformly arranged; the thickness of the protrusions 31 is 30 μm to 100 μm (30 μm, or 60 μm, or 80 μm, or 100 μm, etc. depending on the actual use requirements, in the present embodiment, 100 μm); when the plurality of protrusions 31 are on the same horizontal line, a blank space 32 is provided between two adjacent protrusions 31. The arrangement ensures the wettability of the pole pieces and simultaneously ensures the consistency of the performance of the pole pieces.
In the present embodiment, the blank area 32 refers to the void above the planar coating where no protrusions are provided. By arranging the grid-shaped coating 30 on the plane coating 20 on the side surface of the pole piece substrate 10 and arranging the blank areas 32 between the protrusions 31, the pole piece can contain more electrolyte, so that the contact area of the pole piece and the electrolyte is effectively increased, the wettability of the pole piece (particularly the middle part of the pole piece) is further effectively improved, and the risk of membrane wrinkling caused by gas production during battery formation can be effectively reduced.
In the utility model, the pole piece substrate can be a foil substrate, and the material of the foil substrate can be selected according to actual use requirements.
As a preferred embodiment, the blank space 32 is spaced from the protrusion 31, and the planar area of the blank space 32 is the same as the planar area of the protrusion 31.
As a preferred embodiment, each of the projections 31 has a length of 10mm to 5000mm (may be set to 10mm, or 300mm, or 2000mm, or 5000mm, etc. in the present example, 500 mm.) depending on actual use requirements; each of the blank areas 32 has a length of 10mm to 500mm (may be set to 10mm, or 90mm, or 300mm, or 500mm, etc., depending on the actual use requirements). By the arrangement, the wettability of the pole piece can be well ensured.
As a preferred embodiment, the thickness of the planar coating 20 is the same as the thickness of the grid-like coating 30.
As a preferred embodiment, the protrusions 31 are square (may be square, or rectangular) protrusions; the blank area 32 is a square (may be square or rectangular) blank area.
As a preferred embodiment, the planar coating 20 is disposed on both sides of the pole piece substrate 10, and the grid-like coating 30 is disposed on the planar coating 20. In this way, the pole piece substrate 10 can be completely covered, so that the risk of short circuit caused by foil exposure is effectively avoided.
As a preferred embodiment, the electrode sheet base 10 is a positive electrode sheet base or a negative electrode sheet base.
On the other hand, the embodiment of the utility model also provides a battery cell, which comprises a plurality of positive plates, a diaphragm and a plurality of negative plates, wherein the diaphragm is arranged between the positive plates and the negative plates; the positive plate and the negative plate are both made of the plate structure for improving the wettability of the electrolyte.
As a preferred embodiment, the blank area of the positive electrode sheet is provided corresponding to the blank area of the negative electrode sheet.
In a preferred embodiment, the battery cell is a laminated battery cell or a wound battery cell.
According to the utility model, the grid-shaped coating is arranged on the two side surfaces of the pole piece substrate, and the protrusions and the depressions are formed between the plane coating and the grid-shaped coating, so that the pole piece can contain more electrolyte, the contact area of the pole piece for the electrolyte is effectively increased, and the wettability of the pole piece (particularly the middle part of the pole piece) is effectively improved; meanwhile, the infiltration time of the electrolyte can be effectively shortened, and the risk of diaphragm wrinkling caused by gas production in battery formation can be effectively reduced. The pole piece manufacturing device is simple in structure and easy to prepare, can effectively solve the problems of slow infiltration, poor infiltration of the center of the pole piece and the like of the existing pole piece, and can be used as a universal product for production and use.
In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. The pole piece structure for improving the wettability of the electrolyte is characterized by comprising a pole piece substrate, a planar coating arranged on the side surface of the pole piece substrate and a grid-shaped coating arranged on the planar coating;
the plane coating is uniformly coated on the side surface of the pole piece substrate; the thickness of the plane coating is 30-150 mu m;
the latticed coating comprises a plurality of bulges which are uniformly arranged; the thickness of the bulge is 30-100 mu m; when a plurality of bulges are positioned on the same horizontal line, a blank space is arranged between two adjacent bulges.
2. The pole piece structure of claim 1, wherein the blank space is spaced from the protrusion, and the planar area of the blank space is the same as the planar area of the protrusion.
3. The pole piece structure for improving electrolyte wettability according to claim 1, wherein the length of each of the protrusions is 10mm to 5000mm; the length of each blank area is 10 mm-500 mm.
4. The pole piece structure with improved electrolyte wettability of claim 1, wherein the planar coating has the same thickness as the grid-like coating.
5. The pole piece structure for improving electrolyte wettability of claim 1, wherein the protrusions are square protrusions; the blank area is a square blank area.
6. The pole piece structure for improving electrolyte wettability according to claim 1, wherein the planar coating layers are provided on both side surfaces of the pole piece substrate, and the grid-like coating layers are provided on the planar coating layers.
7. The electrode sheet structure for improving wettability by an electrolyte according to claim 1, wherein the electrode sheet substrate is a positive electrode sheet substrate or a negative electrode sheet substrate.
8. The battery cell is characterized by comprising a plurality of positive plates, a diaphragm and a plurality of negative plates, wherein the diaphragm is arranged between the positive plates and the negative plates; the positive plate and the negative plate are both made of the plate structure for improving the wettability of the electrolyte according to any one of claims 1 to 7.
9. The cell of claim 8, wherein the blank area of the positive electrode tab is disposed in correspondence with the blank area of the negative electrode tab.
10. The cell of claim 8, wherein the cell is a laminated cell or a wound cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321150890.5U CN220138344U (en) | 2023-05-12 | 2023-05-12 | Pole piece structure and electric core for improving electrolyte wettability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321150890.5U CN220138344U (en) | 2023-05-12 | 2023-05-12 | Pole piece structure and electric core for improving electrolyte wettability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220138344U true CN220138344U (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321150890.5U Active CN220138344U (en) | 2023-05-12 | 2023-05-12 | Pole piece structure and electric core for improving electrolyte wettability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220138344U (en) |
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2023
- 2023-05-12 CN CN202321150890.5U patent/CN220138344U/en active Active
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