A lithium-ion battery pole piece

Abstract

This utility model belongs to the field of lithium-ion battery technology, specifically relating to a lithium-ion battery electrode sheet. It includes a current collector, with active material layers respectively disposed on both sides of the current collector. A first tab groove and a second tab groove are respectively formed on the two active material layers. A tab is disposed within the first or second tab groove, and the tab is fixedly connected to the current collector. The first and second tab grooves are used to embed protective adhesive. This utility model, by adjusting the size, shape, and relative position of the first and second tab grooves, creates a misalignment or step between them, which can reduce the impact of laser cleaning energy on the coating and the cumulative thickness difference of the grooves on the roll material, thus reducing the risks of powder shedding, strip breakage, weld brittleness, and corrugated sheets.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, and specifically relates to a lithium-ion battery electrode. Background Technology

[0002] As lithium-ion batteries are used in increasingly diverse applications, the demand for fast charging capabilities is also rising. The centrally located tab structure, an effective means of improving fast charging performance, involves placing tab slots at the protective adhesive location and embedding the protective adhesive paper within these slots. Compared to existing technologies, this effectively reduces the thickness of the protective adhesive causing cell protrusions, avoiding bridging caused by these protrusions. This shortens the interface path for ion conduction at this point, reduces impedance, and prevents interface defects such as bubbles and pores. Currently, the industry standard for tab slots is a symmetrical structure about the current collector, achieved through laser cleaning. However, laser cleaning exposes the same location to energy impacts during operation, leading to issues such as electrode powder shedding, strip breakage, and brittle weld fracture. Furthermore, the thickness difference between the slots and the normal electrode sheet can cause severe wavy deformation of the wound material after baking, affecting the consistency of the negative electrode's dimensions over the positive electrode. Therefore, there is an urgent need to design a lithium-ion battery electrode structure that avoids these problems. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a lithium-ion battery electrode and specifically discloses the following technical solution:

[0004] A lithium-ion battery electrode includes a current collector, on which active material layers are respectively disposed on both sides. A first tab groove and a second tab groove are respectively formed on the two active material layers. The positions of the first tab groove and the second tab groove are corresponding or the first tab groove and the second tab groove are misaligned. A tab is disposed in the first tab groove or the second tab groove, and the tab is fixedly connected to the current collector.

[0005] Furthermore, a first protective adhesive groove is provided on the side of the first electrode groove away from the current collector on the active material layer, and a first protective adhesive is provided in the first protective adhesive groove. A second protective adhesive groove is provided on the side of the second electrode groove away from the current collector on the active material layer, and a second protective adhesive is provided in the second protective adhesive groove.

[0006] Furthermore, the width of the first protective adhesive groove is greater than the width of the first electrode ear groove, and the two sides of the first protective adhesive groove extend beyond the two sides of the first electrode ear groove, and the width of the second protective adhesive groove is greater than the width of the second electrode ear groove, and the two sides of the second protective adhesive groove extend beyond the two sides of the second electrode ear groove.

[0007] Furthermore, the minimum design depth of the first protective adhesive groove is equal to the thickness of the first protective adhesive divided by the thickness of the single-sided active material layer after rolling, and then multiplied by the thickness of the initially coated single-sided active material layer. The minimum design depth of the second protective adhesive groove is equal to the thickness of the second protective adhesive divided by the thickness of the single-sided active material layer after rolling, and then multiplied by the thickness of the initially coated single-sided active material layer.

[0008] Furthermore, when the positions of the first electrode groove and the second electrode groove correspond, the width of the first electrode groove is greater than the width of the second electrode groove, and the projections of the first electrode groove and the second electrode groove in the vertical direction have an overlapping area, and the electrode is set in the overlapping area of ​​the first electrode groove or the second electrode groove.

[0009] Furthermore, both the first and second electrode grooves are symmetrical about the same central plane.

[0010] Furthermore, when the first electrode groove and the second electrode groove are misaligned, the projections of the first electrode groove and the second electrode groove in the vertical direction overlap. The electrode is set in the overlapping area of ​​the first electrode groove or the second electrode groove, and the width of the first electrode groove is the same as the width of the second electrode groove.

[0011] Furthermore, when the positions of the first electrode groove and the second electrode groove correspond, the first electrode groove and the second electrode groove are symmetrical about the current collector, and both the first electrode groove and the second electrode groove are stepped.

[0012] Furthermore, both the first electrode groove and the second electrode groove include a wide groove portion and a narrow groove portion, with the narrow groove portion located on the side closer to the current collector and the wide groove portion located on the side farther away from the current collector.

[0013] Furthermore, a third protective adhesive groove is provided on the same side as the first electrode ear groove and / or the second electrode ear groove, and a third protective adhesive is provided in the third protective adhesive groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention, through the depth design of the first and second protective adhesive grooves and the adjustment of the size, shape, and relative position of the first and second electrode ear grooves, makes the first and second electrode ear grooves form a misalignment or step, which can reduce the impact of laser cleaning on the coating energy and the cumulative difference in groove thickness on the roll material, thereby reducing the risk of powder shedding, strip breakage, weld brittle fracture, and corrugated sheet. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Example 1.

[0017] Figure 2 This is a schematic diagram of the structure of Example 2.

[0018] Figure 3 This is a schematic diagram of the structure of Example 3.

[0019] 1-Current collector, 2-Active material layer, 3-First tab groove, 4-Second tab groove, 5-Taper, 6-First protective adhesive groove, 7-Second protective adhesive groove, 8-First protective adhesive, 9-Second protective adhesive, 10-Third protective adhesive. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] Reference Figure 1 A lithium-ion battery electrode includes a current collector 1. Active material layers 2 are respectively disposed on both sides of the current collector 1. A first tab groove 3 and a second tab groove 4 are respectively formed on the two active material layers 2. The positions of the first tab groove 3 and the second tab groove 4 are corresponding. A tab 5 is disposed in the first tab groove 3 or the second tab groove 4. The tab 5 is fixedly connected to the current collector 1.

[0023] In this embodiment, a first protective adhesive groove 6 is provided on the active material layer 2 on the side of the first electrode groove 3 away from the current collector 1, and a first protective adhesive 8 is provided in the first protective adhesive groove 6. A second protective adhesive groove 7 is provided on the active material layer 2 on the side of the second electrode groove 4 away from the current collector 1, and a second protective adhesive 9 is provided in the second protective adhesive groove 7.

[0024] In this embodiment, the width of the first protective adhesive groove 6 is greater than the width of the first electrode ear groove 3, and the two sides of the first protective adhesive groove 6 extend beyond the two sides of the first electrode ear groove 3 respectively. The width of the second protective adhesive groove 7 is greater than the width of the second electrode ear groove 4, and the two sides of the second protective adhesive groove 7 extend beyond the two sides of the second electrode ear groove 4 respectively.

[0025] In this embodiment, the minimum design depth of the first protective adhesive groove 6 is equal to the thickness of the first protective adhesive 8 divided by the thickness of the single-sided active material layer 2 after rolling, and then multiplied by the thickness of the initially coated single-sided active material layer 2. The minimum design depth of the second protective adhesive groove 7 is equal to the thickness of the second protective adhesive 9 divided by the thickness of the single-sided active material layer 2 after rolling, and then multiplied by the thickness of the initially coated single-sided active material layer 2. The maximum design depth of the first protective adhesive groove 6 and the second protective adhesive groove 7 are designed based on the actual equipment capacity and the thickness of the single-sided active material layer 2, and should be less than the thickness of the single-sided active material layer 2.

[0026] The first protective adhesive groove 6 and the second protective adhesive groove 7 are provided so that the first protective adhesive 8 and the second protective adhesive 9 can be embedded into the electrode sheet.

[0027] In this embodiment, the width of the first electrode groove 3 is greater than the width of the second electrode groove 4, and the projections of the first electrode groove 3 and the second electrode groove 4 in the vertical direction have an overlapping area. The electrode 5 is disposed in the overlapping area of ​​the first electrode groove 3 or the second electrode groove 4.

[0028] In this embodiment, the first electrode groove 3 and the second electrode groove 4 are both symmetrical about the same central plane.

[0029] In this embodiment, a third protective adhesive groove is also provided on the same side of the first electrode ear groove 3 and / or the second electrode ear groove 4. The third protective adhesive groove is parallel to the first electrode ear groove 3 or the second electrode ear groove 4 on the same side, and a third protective adhesive 10 is provided in the third protective adhesive groove.

[0030] Example 2

[0031] Reference Figure 2 The difference between the technical solution of this embodiment and the technical solution of embodiment 1 is that: the first electrode groove 3 and the second electrode groove 4 are misaligned, and the projections of the first electrode groove 3 and the second electrode groove 4 in the vertical direction have an overlapping area. The electrode 5 is set in the overlapping area of ​​the first electrode groove 3 or the second electrode groove 4, and the width of the first electrode groove 3 is the same as the width of the second electrode groove 4.

[0032] Example 3

[0033] Reference Figure 3 The technical solution of this embodiment differs from that of embodiment 1 in that: the first electrode groove 3 and the second electrode groove 4 are symmetrical about the current collector 1, and both the first electrode groove 3 and the second electrode groove 4 are stepped; both the first electrode groove 3 and the second electrode groove 4 include a wide groove and a narrow groove, the narrow groove is located on the side closer to the current collector 1, and the wide groove is located on the side away from the current collector 1.

[0034] This invention, through the depth design of the first protective adhesive groove 6 and the second protective adhesive groove 7, and the adjustment of the size, shape and relative position of the first electrode groove 3 and the second electrode groove 4, makes the first electrode groove 3 and the second electrode groove 4 form a misalignment or step, which can reduce the impact of laser cleaning on the coating energy and the cumulative difference in groove thickness on the roll material, and reduce the risk of powder shedding, strip breakage, weld brittle breakage and corrugated sheet.

[0035] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A lithium-ion battery pole piece, characterized in that, The device includes a current collector, on which active material layers are respectively disposed on both sides. A first electrode groove and a second electrode groove are respectively formed on the two active material layers. The positions of the first electrode groove and the second electrode groove are corresponding or the first electrode groove and the second electrode groove are misaligned. An electrode is disposed in the first electrode groove or the second electrode groove, and the electrode is fixedly connected to the current collector.

2. The lithium-ion battery pole piece of claim 1, wherein, A first protective adhesive groove is provided on the active material layer on the side of the first electrode groove away from the current collector, and a first protective adhesive is provided in the first protective adhesive groove. A second protective adhesive groove is provided on the active material layer on the side of the second electrode groove away from the current collector, and a second protective adhesive is provided in the second protective adhesive groove.

3. A lithium-ion battery electrode according to claim 2, characterized in that, The width of the first protective adhesive groove is greater than the width of the first electrode ear groove, and the two sides of the first protective adhesive groove extend beyond the two sides of the first electrode ear groove. The width of the second protective adhesive groove is greater than the width of the second electrode ear groove, and the two sides of the second protective adhesive groove extend beyond the two sides of the second electrode ear groove.

4. A lithium-ion battery electrode according to claim 2, characterized in that, The minimum design depth of the first protective adhesive groove is equal to the thickness of the first protective adhesive divided by the thickness of the single-sided active material layer after rolling, and then multiplied by the thickness of the initially coated single-sided active material layer. The minimum design depth of the second protective adhesive groove is equal to the thickness of the second protective adhesive divided by the thickness of the single-sided active material layer after rolling, and then multiplied by the thickness of the initially coated single-sided active material layer.

5. A lithium-ion battery electrode according to claim 1, characterized in that, When the positions of the first electrode groove and the second electrode groove correspond, the width of the first electrode groove is greater than the width of the second electrode groove, and the projections of the first electrode groove and the second electrode groove in the vertical direction have an overlapping area. The electrode is set in the overlapping area of ​​the first electrode groove or the second electrode groove.

6. A lithium-ion battery electrode according to claim 5, characterized in that, The first electrode groove and the second electrode groove are both symmetrical about the same central plane.

7. A lithium-ion battery electrode according to claim 1, characterized in that, When the first electrode groove and the second electrode groove are misaligned, the projections of the first electrode groove and the second electrode groove in the vertical direction have an overlapping area. The electrode is set in the overlapping area of ​​the first electrode groove or the second electrode groove, and the width of the first electrode groove is the same as the width of the second electrode groove.

8. A lithium-ion battery electrode according to claim 1, characterized in that, When the positions of the first electrode groove and the second electrode groove correspond, the first electrode groove and the second electrode groove are symmetrical about the current collector, and both the first electrode groove and the second electrode groove are stepped.

9. A lithium-ion battery electrode according to claim 8, characterized in that, Both the first electrode groove and the second electrode groove include a wide groove portion and a narrow groove portion, with the narrow groove portion located on the side closer to the current collector and the wide groove portion located on the side farther away from the current collector.

10. The lithium-ion battery electrode according to any one of claims 1-9, characterized in that, A third protective adhesive groove is also provided on the same side as the first electrode ear groove and / or the second electrode ear groove, and a third protective adhesive is provided in the third protective adhesive groove.

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