CN220569731U - Negative electrode piece, lithium ion battery and electrochemical device - Google Patents
Negative electrode piece, lithium ion battery and electrochemical device Download PDFInfo
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- CN220569731U CN220569731U CN202321903045.0U CN202321903045U CN220569731U CN 220569731 U CN220569731 U CN 220569731U CN 202321903045 U CN202321903045 U CN 202321903045U CN 220569731 U CN220569731 U CN 220569731U
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- negative electrode
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 160
- 239000011248 coating agent Substances 0.000 claims abstract description 146
- 238000005056 compaction Methods 0.000 claims abstract description 18
- 239000013543 active substance Substances 0.000 claims abstract description 9
- 239000011149 active material Substances 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 description 17
- 239000011247 coating layer Substances 0.000 description 10
- 239000003792 electrolyte Substances 0.000 description 8
- 238000003825 pressing Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000010287 polarization Effects 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses a negative pole piece, a lithium ion battery and an electrochemical device, wherein the negative pole piece at least comprises: the coating area is coated with an active substance and comprises a first characteristic coating and a second characteristic coating, the first characteristic coating and the second characteristic coating extend along the length direction of the negative electrode plate and are alternately arranged in the width direction, the compaction density of the first characteristic coating is ρ1, the compaction density of the second characteristic coating is ρ2, and ρ1 is less than ρ2; and a non-coating region disposed on at least one side of the coating region in a width direction. According to the negative electrode plate, the lithium ion battery and the electrochemical device, the safety and the quick charge performance of the battery can be improved.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a negative electrode plate, a lithium ion battery and an electrochemical device.
Background
The rapid development of new energy technology brings higher requirements to the technical characteristics of energy density, service life, quick charge, safety and the like of lithium ion batteries.
The expansion internal stress borne by the middle part of the laminated battery core and the middle part of the winding core is aggravated along with the continuous improvement of the single battery core capacity of the winding and lamination structure, and meanwhile, the internal stress of the pole piece is aggravated along with the further development and the wide application of a high-nickel high-silicon system. And further, electrolyte is unevenly distributed in the charge and discharge process, so that the polarization of charge and discharge kinetics is increased, and the quick charge capacity, the rate capability and the power performance of a battery system are deteriorated to different degrees.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a negative electrode plate, a lithium ion battery and an electrochemical device, which can effectively relieve the internal stress of the battery electrode plate, effectively improve the overall quick charge performance of the battery cell and improve the safety of the battery cell.
The utility model provides a negative electrode plate, which at least comprises:
the coating area is coated with an active substance and comprises a first characteristic coating and a second characteristic coating, the first characteristic coating and the second characteristic coating extend along the length direction of the negative electrode plate and are alternately arranged in the width direction, the compaction density of the first characteristic coating is ρ1, the compaction density of the second characteristic coating is ρ2, and ρ1 is less than ρ2;
and a non-coating region disposed on at least one side of the coating region in a width direction.
In some embodiments of the utility model, the compacted density ρ1 of the first feature coating and the compacted density thickness ρ2 of the second feature coating satisfy ρ1=0.85 ρ2 to 0.98 ρ2.
In some embodiments of the utility model, the active material comprises elemental silicon.
In some embodiments of the utility model, the thickness of the first and second feature coatings is the same, and the areal density of the first and second feature coatings is different.
In some embodiments of the utility model, the first feature coating has a width W1 and the second feature coating has a thickness W2, and satisfies 0.1W1.ltoreq.W2.ltoreq.5W1, 1 mm.ltoreq.W1.ltoreq.20mm.
In some embodiments of the utility model, the gram capacity of the first feature coating is G1, the gram capacity of the second feature coating is G2, and 0.8.ltoreq.G1.ltoreq.1.1, 0.9.ltoreq.G2.ltoreq.1.1, G1 < G2 is satisfied.
In some embodiments of the utility model, the thickness of the first and second feature coatings are different, and the areal density of the first and second feature coatings is the same.
In some embodiments of the utility model, the first feature coating has a thickness of W3 and the second feature coating has a thickness of W4, and is 0.1W4.ltoreq.W3.ltoreq.5W4, 1 mm.ltoreq.W4.ltoreq.20mm.
In some embodiments of the utility model, the surface of the second feature coating is concave and the shape of the surface is one of a semi-elliptical, a semi-elliptical partially curved surface, or a trapezoidal surface.
The utility model also provides a lithium ion battery, which comprises the negative electrode plate.
The utility model also provides an electrochemical device comprising the lithium ion battery.
In summary, the present utility model provides a negative electrode tab, a lithium ion battery, and an electrochemical device, in which a first feature coating and a second feature coating are disposed on a coating region of the negative electrode tab, and the first feature coating and the second feature coating with different compaction densities are alternately arranged on the coating region of the negative electrode tab. The internal stress of the pole piece is effectively relieved, the uniformity of electrolyte distribution on the pole piece is improved, and the dynamic polarization during battery charging and discharging is relieved, so that the quick charge capacity, the multiplying power performance, the power performance and the safety of the battery are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for 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 utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a negative electrode tab in an embodiment.
Fig. 2 is a cross-sectional view along AA direction of the anode sheet of fig. 1 after coating an active material thereon.
Fig. 3 is a schematic diagram of the compacted density of the negative electrode tab of fig. 1 along the AA direction.
Fig. 4 is a front view of an active material coated on a negative electrode tab in another embodiment.
FIG. 5 is a schematic view of a negative electrode sheet in another embodiment
Fig. 6 is a cross-sectional view of the negative electrode tab of fig. 5 along the BB direction.
Fig. 7 is a schematic diagram of the compacted density of the negative electrode tab of fig. 5 along the BB direction.
Marking:
10. a coating region; 20. a non-coated region; 11. a first feature coating; 12. and a second feature coating.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
In the present utility model, it should be noted that, as terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear, the indicated orientation or positional relationship is based on that shown in the drawings, only for convenience of description and simplification of the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, as used herein, are used for descriptive and distinguishing purposes only and are not to be construed as indicating or implying a relative importance.
The utility model provides a negative electrode plate and a lithium ion battery, wherein the negative electrode plate comprises a coating area and a non-coating area, an active substance is coated on the coating area, and a first characteristic coating and a second characteristic coating with different compaction densities are arranged on the coating area, wherein the compaction density refers to the mass of the active substance in unit volume. The internal stress of the battery pole piece can be relieved, dynamic polarization of battery charge and discharge is relieved, the overall quick level and safety of the battery core are improved, the preparation process is simple, the effect is obvious, and the battery pole piece can be used for preparing batteries of different types.
As shown in fig. 1, in an embodiment of the present utility model, the coated region 10 and the uncoated region 20 extend, for example, in the length direction X of the negative electrode tab, and the coated region 10 and the uncoated region 20 are arranged, for example, in the width direction Y of the negative electrode tab. In this embodiment, the X direction of fig. 1 is defined as the length direction of the negative electrode tab, and the Y direction is defined as the width direction of the negative electrode tab. In this embodiment, the non-coating regions 20 are disposed on two sides of the coating region 10, for example, and the non-coating region 20 on one side of the coating region 10 is subjected to tab die cutting to form a negative electrode tab in a subsequent manufacturing process, and the coating region 10 is coated with an active material. The shape of the negative electrode piece is, for example, rectangular or other shapes, and in this embodiment, the shape of the negative electrode piece is, for example, rectangular, so as to avoid the problem that the current density is unevenly distributed due to the special shape.
As shown in fig. 1, in one embodiment of the present utility model, the coating region 10 includes at least a first feature coating 11 and a second feature coating 12, for example, and the first feature coating 11 and the second feature coating 12 are disposed on the coating region 10 along the length direction of the negative electrode sheet, for example. I.e. the first and second characteristic coating layers 11, 12 are alternately arranged on the coating region 10, for example, in the width direction of the negative electrode tab, and adjacent edges of the first and second characteristic coating layers 11, 12 are connected. The present utility model is not limited to the number of first and second feature coatings 11, 12, the number of first and second feature coatings 11, 12 being set, for example, according to the size of the negative electrode tab and the requirements of a particular production. The shapes of the first feature coating 11 and the second feature coating 12 are, for example, rectangular or other shapes, in this embodiment, the shapes of the first feature coating 11 and the second feature coating 12 are, for example, rectangular, and the lengths of the first feature coating 11 and the second feature coating 12 are equal to the length of the coating region 10.
As shown in fig. 1, in an embodiment of the present utility model, the compacted densities of the first feature coating 11 and the second feature coating 12 are different, the compacted density of the first feature coating 11 is ρ1, the compacted density of the second feature coating 12 is ρ2, the compacted density of the first feature coating 11 is smaller than the compacted density of the second feature coating 12, and ρ1=0.85 ρ2 to 0.98 ρ2 is satisfied. The present utility model is not limited to the forming method of the first feature coating 11 and the second feature coating 12, and is not limited to the kind of active material contained in the first feature coating 11 and the second feature coating 12, and in the present embodiment, the active material contained in the first feature coating 11 and the second feature coating 12 is the same, and the active material includes, for example, silicon element. By setting the compaction densities of the first characteristic coating 11 and the second characteristic coating 12 to be different, the problem of internal stress concentration of the negative electrode plate is relieved, and the deterioration of quick charge capacity caused by the stress concentration is improved. Meanwhile, the electrolyte is promoted to be uniformly distributed in the negative electrode plate, so that the polarization condition during quick charge is relieved, and the quick charge capacity, the multiplying power performance, the power performance and the safety of the battery are improved. In this embodiment, the active material contains silicon element, the expansion condition of the negative electrode plate is serious, and the effect of relieving the expansion internal stress of the negative electrode plate by the first characteristic coating 11 and the second characteristic coating 12 provided by the utility model is particularly remarkable for the negative electrode plate containing silicon.
In one embodiment of the utility model, as shown in fig. 1-3, to obtain feature coatings of different compacted densities on the negative electrode sheet, for example, active materials of different areal densities, i.e. different mass per unit area of active material, are provided on different regions of the negative electrode sheet. In this embodiment, the difference in areal density is, for example, manifested by a difference in the thickness of the active substance applied to the different areas, the areal density of the second feature coating 12 being greater than the areal density of the first feature coating 11, i.e. the thickness of the active substance on the second feature coating 12 is set to be greater than the thickness of the first feature coating 11. The first and second characteristic coatings 11, 12 having different compacted densities are obtained by uniform rolling, for example, by one of uniform cold pressing or uniform hot pressing. In this embodiment, the surface of the first feature coating 11 before rolling is concave, the shape of the surface is one of semi-elliptical or semi-elliptical partial curved surfaces, the maximum thickness of the first feature coating 11 before rolling is, for example, H1, and the width of the first feature coating 11 before rolling is, for example, W1. The width of the second feature coat 12 before rolling is, for example, W2, and the widths of the first feature coat 11 and the second feature coat 12 before rolling satisfy, for example, 0.1W1.ltoreq.w2.ltoreq.5w1. By arranging the first characteristic coating 11 and the second characteristic coating 12 with different surface densities of active substances, the first characteristic coating 11 and the second characteristic coating 12 with different compaction densities are formed after uniform rolling, so that the functions of relieving the internal stress of the battery cell and uniformly distributing electrolyte are realized.
As shown in fig. 1 to 3, in an embodiment of the present utility model, the thicknesses of the first feature coating 11 and the second feature coating 12 formed after rolling are the same, and the widths of the first feature coating 11 and the second feature coating 12 do not change during uniform rolling, and the widths of the first feature coating 11 and the second feature coating 12 after rolling are the same as those before rolling, for example, W1 and W2, respectively. And after uniform rolling, the surface of the first feature coating 11 is presented as a plane by a concave surface, for example, while the thickness of the first feature coating 11 is reduced, the reduced thickness of the first feature coating 11 is h1, for example, and the reduced thickness satisfies 0.02H1.ltoreq.h1.ltoreq. 0.09H1, for example. The range of the reduced thickness of the first feature coating 11 is set within a preset range, for example, so as to avoid the occurrence of lithium precipitation in the first feature coating 11, which causes safety risks. The thickness of the second feature coating 12 is reduced, for example, to the same thickness as the first feature coating 11, and the compacted density of the first feature coating 11 is less than the compacted density of the second feature coating 12 due to the difference in the areal density of the active material on the negative electrode sheet. After obtaining the anode sheet, the capacity of the anode sheet, i.e., the gram capacity of the first feature coating 11 and the second feature coating 12, which can be released by the active material per unit mass, is tested, and in this embodiment, the gram capacity of the first feature coating 11 is G1, the gram capacity of the second feature coating 12 is G2, and the gram capacities of the first feature coating 11 and the second feature coating 12 satisfy 0.8.ltoreq.g1.ltoreq.1.1, 0.9.ltoreq.g2.ltoreq.1.1, and G1 < G2, for example.
In another embodiment of the present utility model, as shown in fig. 4 to 7, for example, active materials with the same surface density are disposed on one surface of the negative electrode sheet, that is, the active materials are uniformly coated on the negative electrode sheet, and then rolling with different intensity is applied on the negative electrode sheet, for example, one of non-uniform cold pressing or non-uniform hot pressing, so as to obtain feature coatings with different thicknesses, thereby obtaining a first feature coating 11 and a second feature coating 12 with different compaction densities. Wherein the thickness of the first and second characteristic coating layers 11 and 12 before rolling is the same, for example H2. In the present embodiment, the roll applied on the first feature coat 11 is, for example, a weak roll, and is, for example, an equal thickness roll, the width of the weak roll is, for example, W3, and the surface of the first feature coat 11 after the roll is flat. The roll-pressing applied on the second feature coat 12 is, for example, a strong roll-pressing, the width of the strong roll-pressing is, for example, W3, the surface of the second feature coat 12 is concave after the strong roll-pressing, and the shape of the surface is one of a semi-elliptical, a semi-elliptical partially curved surface, or a trapezoidal surface.
In another embodiment of the present utility model, as shown in fig. 4 to 7, after non-uniform rolling, the first and second characteristic coating layers 11 and 12 are formed to have different thicknesses, and the first and second characteristic coating layers 11 and 12 having different compaction densities are formed due to the same areal density. Wherein the widths of the first and second characteristic coating layers 11 and 12 are the same as the width of the roll-in action, i.e., the width of the first characteristic coating layer 11 is, for example, W3, the width of the second characteristic coating layer 12 is, for example, W4, the widths of the first and second characteristic coating layers 11 and 12 satisfy, for example, 0.1W4.ltoreq.W3.ltoreq.5W4, and the width of the second characteristic coating layer 12 satisfies, for example, 1 mm.ltoreq.W4.ltoreq.20mm. Meanwhile, after the first characteristic coating 11 and the second characteristic coating 12 are rolled unevenly, the thickness of the second characteristic coating 12 is smaller than that of the first characteristic coating 11, the thickness difference between the two characteristic coatings is H2, and the thickness difference H2 and the thickness H2 of the characteristic coating before rolling are 0.02H2H 2 0.09H2. After the active substances are uniformly coated, non-uniform rolling is performed, so that the first characteristic coating 11 and the second characteristic coating 12 with different thicknesses and different compaction densities are obtained, the expansion internal stress of the battery core is effectively relieved, the electrolyte is uniformly distributed, and the quick charge performance of the battery is improved.
The utility model also provides a lithium ion battery, wherein after the first characteristic coating and the second characteristic coating are formed on the negative electrode plate, the negative electrode plate is subjected to steps such as drying, pressing, slitting, lug die cutting and the like, so that the negative electrode plate is obtained. The method of the utility model is not limited by the steps of drying, pressing, slitting, die cutting of the tab and the like, and is the same as the forming method of the conventional lithium ion battery negative electrode plate. And sequentially superposing and assembling the negative electrode plate, the isolating film and the positive electrode plate to obtain a battery cell, wherein the obtained battery cell is one of a laminated square cell or a winding structure winding core. And after the battery core is obtained, injecting electrolyte into the battery core to obtain the lithium ion battery. By arranging the first characteristic coating and the second characteristic coating with different compaction densities on the negative electrode plate, the expansion internal stress borne by the middle part of the laminated battery core and the middle part of the winding battery core is relieved, electrolyte is prevented from being enriched in the peripheral area of the laminated battery core or enriched on two sides of the winding battery core, dynamic polarization during quick charging of the lithium ion battery is slowed down, and quick charging capacity of the battery core is improved.
The utility model also provides an electrochemical device, which comprises the lithium ion battery, and the lithium ion battery pack adopts all the technical schemes related to the negative electrode plate, so that the lithium ion battery pack at least has all the beneficial effects brought by the technical schemes related to the negative electrode plate, and the description is omitted. The electrochemical device includes, for example, at least a battery module, a battery pack, an electric vehicle, an electric ship, an electric airplane, or the like.
In summary, the utility model provides a negative electrode plate, a lithium ion battery and an electrochemical device, wherein a first characteristic coating and a second characteristic coating with different compaction densities are arranged in a coating area of the negative electrode plate, and the first characteristic coating with lower compaction density and the second characteristic coating with higher compaction density are alternately arranged on the negative electrode plate, so that the internal stress in the middle of a battery cell is effectively relieved, the uneven distribution of electrolyte caused by the expansion of the battery cell in the charging and discharging process is avoided, and the quick charging performance and the safety of the lithium ion battery are effectively improved.
The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.
Claims (11)
1. A negative electrode tab, comprising at least:
the coating area is coated with an active substance and comprises a first characteristic coating and a second characteristic coating, the first characteristic coating and the second characteristic coating extend along the length direction of the negative electrode plate and are alternately arranged in the width direction, the compaction density of the first characteristic coating is ρ1, the compaction density of the second characteristic coating is ρ2, and ρ1 is less than ρ2;
and a non-coating region disposed on at least one side of the coating region in a width direction.
2. The negative electrode tab of claim 1, wherein the compacted density ρ1 of the first feature coating and the compacted density thickness ρ2 of the second feature coating satisfy ρ1 = 0.85 ρ2-0.98 ρ2.
3. The negative electrode tab of claim 1, wherein the active material comprises elemental silicon.
4. The negative electrode tab of claim 1, wherein the first and second feature coatings have the same thickness and the first and second feature coatings have different areal densities.
5. The negative electrode tab of claim 4 wherein the first feature coating has a width W1 and the second feature coating has a thickness W2 and meets 0.1W1.ltoreq.w2.ltoreq.5w1, 1 mm.ltoreq.w1.ltoreq.20mm.
6. The negative electrode tab of claim 4 wherein the first characteristic coating has a gram volume G1 and the second characteristic coating has a gram volume G2 and satisfies 0.8.ltoreq.g1.ltoreq.1.1, 0.9.ltoreq.g2.ltoreq.1.1, G1 < G2.
7. The negative electrode tab of claim 1, wherein the first and second feature coatings have different thicknesses, and wherein the first and second feature coatings have the same areal density.
8. The negative electrode tab of claim 7 wherein the first feature coating has a thickness of W3 and the second feature coating has a thickness of W4 and satisfies 0.1W4.ltoreq.w3.ltoreq.5w4, 1 mm.ltoreq.w4.ltoreq.20mm.
9. The negative electrode tab of claim 7, wherein the surface of the second feature coating is concave and the surface is one of semi-elliptical, semi-elliptical in shape, partially curved or trapezoidal.
10. A lithium ion battery comprising the negative electrode sheet of any one of claims 1 to 9.
11. An electrochemical device comprising the lithium-ion battery of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321903045.0U CN220569731U (en) | 2023-07-18 | 2023-07-18 | Negative electrode piece, lithium ion battery and electrochemical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321903045.0U CN220569731U (en) | 2023-07-18 | 2023-07-18 | Negative electrode piece, lithium ion battery and electrochemical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220569731U true CN220569731U (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321903045.0U Active CN220569731U (en) | 2023-07-18 | 2023-07-18 | Negative electrode piece, lithium ion battery and electrochemical device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220569731U (en) |
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2023
- 2023-07-18 CN CN202321903045.0U patent/CN220569731U/en active Active
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