Pole piece structure and battery

Abstract

The utility model provides a pole piece structure. The pole piece structure comprises a foil material, a fabric area A and a fabric area B, the foil material comprises a pointed end part and a perfect circle part connected with the pointed end part, the fabric area A and the fabric area B are arranged on the two opposite sides of the perfect circle part respectively, and the fabric area A and / or the fabric area B are / is provided with flow guide channels which are staggered with each other. According to the pole piece structure disclosed by the utility model, the rate capability and the cycle performance of the lithium ion battery are improved. In addition, the utility model also provides a battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to an electrode structure and a battery. Background Technology

[0002] Most existing lithium-ion battery electrode structures are square, with other shapes being less common. While existing circular battery electrodes can reduce the time for the cell to be immersed in the electrolyte and improve the wetting effect, they can only ensure that the electrolyte wetting distance from the edge to the center is the same. When the radius of the battery electrode is large, the electrolyte wetting effect in the center area of ​​the battery electrode will decrease. Utility Model Content

[0003] Therefore, it is necessary to provide an electrode structure and battery to address the above problems, thereby improving the rate performance and cycle performance of lithium-ion batteries.

[0004] In a first aspect, the present invention provides an electrode structure, including a foil, an A fabric area and a B fabric area. The foil includes a pointed portion and a circular portion connecting the pointed portion. The A fabric area and the B fabric area are respectively located on opposite sides of the circular portion. The A fabric area and / or the B fabric area are provided with intersecting flow channels.

[0005] Furthermore, the A fabric area and / or the B fabric area form four fan-shaped areas, with adjacent fan-shaped areas being symmetrical to each other.

[0006] Furthermore, each of the sector regions includes an arc-shaped edge and two length edges, one end of the two length edges being connected to each other, and the other end of the two length edges being connected to the arc-shaped edge respectively.

[0007] Furthermore, the arc-shaped edge coincides with the edge of the circular portion, and the length edge is at least a portion of the edge of the flow channel.

[0008] Furthermore, the included angle between the two length edges is 0~180°.

[0009] Furthermore, the length of the edge is l, each of the flow channels includes two long sides and a short side connecting the two long sides, the arc length of the short side ranges from 0μm to 0.5πlμm, and the length of the long side ranges from 0.001μm to 10000cm.

[0010] Furthermore, the length of each long side of each of the aforementioned flow channels is equal.

[0011] Furthermore, the pointed tip is divided into electrode tabs. When the battery is assembled by stacking the electrodes, multiple pointed tips are welded together and used for welding with the outer electrode tabs.

[0012] Secondly, the present invention also provides a battery, the battery comprising a positive polarity electrode structure, a separator, and a negative polarity electrode structure, wherein the positive polarity electrode structure and the negative polarity electrode structure are both electrode structures as described in any one of the above.

[0013] Furthermore, the line connecting the tip of the pointed portion and the center of the circular portion is the direction of the tab position. The circular portion of the negative polarity is larger than the circular portion of the positive polarity. The angle between the tab position of the circular portion of the positive polarity and the tab position of the circular portion of the negative polarity is in the range of 90°~270°.

[0014] The electrode structure and battery of this utility model have a teardrop-shaped foil material, which includes a pointed portion and a circular portion connecting the pointed portion. Fabric area A and fabric area B are respectively located on opposite sides of the circular portion. Both fabric areas A and B are four fan-shaped areas formed by two intersecting current-guiding channels. On the one hand, the current-guiding channels in the electrode structure facilitate electrolyte wetting and current conduction, improving the rate performance and cycle performance of the battery cell. On the other hand, the pointed portion facilitates the assembly of stacked battery cells. Furthermore, the electrode structure is easy to form and control manufacturing costs, has lower requirements for coating equipment and accessories, and allows for the removal of material from the current-guiding channels through various methods. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a planar structural schematic diagram of the electrode structure of this utility model from one perspective;

[0017] Figure 2 for Figure 1 The diagram shows a planar structure of the electrode structure from another perspective.

[0018] The numbers in the attached diagram are:

[0019] Foil 1, Fabric A area 2, Fabric B area 3, Pointed part 11, Round part 12. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Please see Figures 1-2 This utility model provides an electrode structure, including a foil 1, an A fabric area 2 and a B fabric area 3. The foil is teardrop-shaped and includes a pointed portion 11 and a circular portion 12 connecting the pointed portion. The A fabric area and the B fabric area are respectively located on opposite sides of the circular portion. The A fabric area and / or the B fabric area are provided with intersecting flow channels.

[0024] The electrode structure is a double-layer material area structure, the foil is composed of ea1a2b1b2c1c2d1d2e, and both the A fabric area and the B fabric area include four fan-shaped areas, namely a1o1d2, a2o2b1, b2o3c1 and c2o4d1.

[0025] The lithium-ion battery is composed of a positive electrode structure, a separator, and a negative electrode structure stacked together, wherein the circular portion of the negative electrode is larger than the circular portion of the positive electrode. For example, the diameter of the circular portion of the negative electrode is D-, and the diameter of the circular portion of the positive electrode is D+, with the difference between D- and D+ being 0.001 μm to 0.5D+. For example, the difference between D- and D+ can be 0.001 μm, or it can be 0.002 μm, 0.003 μm, 0.004 μm, 0.4D+, or 0.5D+, as long as the difference between D- and D+ is within the aforementioned range.

[0026] In one embodiment, fabric area A and / or fabric area B form four sector areas, with adjacent sector areas being symmetrical to each other.

[0027] In one embodiment, each sector includes an arcuate edge and two length edges, one end of the two length edges being connected together, and the other ends of the two length edges being respectively connected to the arcuate edge. For example, the other ends of the two length edges are respectively connected to both ends of the arcuate edge.

[0028] In one embodiment, the arcuate edge and the edge of the circular portion coincide, and the length edge is at least a portion of the edge of the flow channel.

[0029] In one embodiment, the included angle between the two length edges is 0 to 180°. For example, Figure 2 The included angle of a1o1d2 is 0~180°, and can be 0°, 20°, 30°, 40°, 60°, 70°, 80°, 90°, or 120°, 150°, 170°, 180°, as long as the included angle between the two length edges is within the above range.

[0030] In one embodiment, the length of the extended edge is l, and each of the flow channels includes two long sides and a short side connecting the two long sides. The arc length of the short side ranges from 0 μm to 0.5πl μm, i.e., it can be 0 μm, 0.1 μm, 0.2 μm, 0.3 μm, 0.5πl μm, etc. The length of the long side ranges from 0.001 μm to 10000 cm, i.e., it can be 0.001 μm, 0.002 μm, 0.003 μm, 10000 cm, etc. For example, Figure 2 The length of the middle circular arc a1a2 ranges from 0μm to 0.5πa1o1μm, and the lengths a1c2, a2c1, b1d2, and b2d1 range from 0.001μm to 10000cm. The lengths a1c2, a2c1, b1d2, and b2d1 are all equal.

[0031] In one embodiment, the length of each long side of each of the flow channels is equal.

[0032] In one embodiment, the pointed tip is divided into electrode tabs. When the battery is assembled by stacking the electrodes, multiple pointed tips are welded together and used for welding to the outer electrode tab. For example, ea1d2e is an electrode tab. When the battery is assembled by stacking the electrodes, multiple electrode tabs are welded together and then welded to the outer electrode tab.

[0033] In one embodiment, the line connecting the tip of the pointed portion and the center of the circular portion is the tab position direction, and the angle between the tab position of the positive electrode and the tab position of the negative electrode in the circular portion of the lithium-ion battery ranges from 90° to 270°. For example, taking the line eo1 connecting point e and the center o1 as the tab position direction, the angle between the positive electrode eo1 and the negative electrode eo1 ranges from 90° to 270°.

[0034] In one embodiment, the preparation method of the electrode structure mainly includes the following three methods;

[0035] Method 1: Coat a teardrop-shaped area structure using a coating machine, with the same method for both single and double sides, to obtain the desired electrode structure.

[0036] Method 2: First, apply a circular coating a1a2b1b2c1c2d1d2a1, then remove the coating from the a1a2c1c2 and b1b2d1d2 regions using laser cleaning or other methods; the single-sided and double-sided methods are the same to obtain the desired electrode structure.

[0037] For example, in one embodiment, a teardrop-shaped electrode is prepared by method 2; the angle a1o1d2 is 90°, and the position of a1 is the position when the angles ea1o1=90°, ed2o1=90°, and a1o1d2=90°; the length of the arc a1a2 is 10mm, and the lengths a1c2, a2c1, b1d2, and b2d1 are all 100mm, and the lengths a1c2, a2c1, b1d2, and b2d1 are the diameters of the perfect circle a1a2b1b2c1c2d1d2a1; the region ea1d2e is the electrode tab, and when 10 positive electrode sheets + 12 layers of separator + 11 negative electrode sheets are stacked to form a battery, multiple positive electrode tabs are welded together, multiple negative electrode tabs are welded together, and are respectively welded to the positive outer electrode tab and the negative outer electrode tab; the included angle between the positive electrode tab and the negative electrode tab is 180°. The circular portion of the negative electrode is larger than the circular portion of the positive electrode. For example, the diameter of the circular portion of the negative electrode is D-, the diameter of the circular portion of the positive electrode is D+, and the difference between D- and D+ is 0.1D+.

[0038] Method 3: First, apply the specified adhesive tape to the a1a2c1c2 area and b1b2d1d2 area on both sides of the foil. Then, apply a circular coating a1a2b1b2c1c2d1d2a1. Finally, remove the adhesive tape from the a1a2c1c2 area and the b1b2d1d2 area, and remove the coating from the same area. The single-sided and double-sided methods are the same to obtain the desired electrode structure.

[0039] The electrode structure and battery of this utility model include a teardrop-shaped foil material comprising a pointed portion and a circular portion connecting the pointed portion. Fabric area A and fabric area B are respectively located on opposite sides of the circular portion. Both fabric areas A and B are four fan-shaped areas formed by two intersecting current-guiding channels. On one hand, the current-guiding channels in the electrode structure facilitate electrolyte wetting and current conduction, improving the rate performance and cycle performance of the battery cell. On the other hand, the pointed portion facilitates the assembly of stacked battery cells. Furthermore, the electrode structure is easy to form and control manufacturing costs, has lower requirements for coating equipment and accessories, and allows for the removal of material from the current-guiding channel area through various methods.

[0040] The above embodiments merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode structure, characterized in that: It includes a foil, a fabric area A, and a fabric area B. The foil includes a pointed portion and a circular portion connecting the pointed portion. The fabric area A and the fabric area B are respectively located on opposite sides of the circular portion. The fabric area A and / or the fabric area B are provided with intersecting flow channels.

2. The electrode structure as described in claim 1, characterized in that: The A fabric area and / or the B fabric area form four sector areas, with adjacent sector areas being symmetrical to each other.

3. The electrode structure as described in claim 2, characterized in that: Each of the sector regions includes an arc-shaped edge and two length edges, one end of the two length edges being connected together, and the other end of the two length edges being connected to the arc-shaped edge respectively.

4. The electrode structure as described in claim 3, characterized in that: The arc-shaped edge and the edge of the circular portion coincide, and the length edge is at least a portion of the edge of the flow channel.

5. The electrode structure as described in claim 3, characterized in that: The included angle between the two length edges is 0~180°.

6. The electrode structure as described in claim 3, characterized in that: The length of the edge is l, and each of the flow channels includes two long sides and a short side connecting the two long sides. The arc length of the short side ranges from 0 μm to 0.5πl μm, and the length of the long side ranges from 0.001 μm to 10000 cm.

7. The electrode structure as described in claim 3, characterized in that: Each of the long sides of each of the aforementioned flow channels has the same length.

8. The electrode structure as described in claim 1, characterized in that: The pointed tip is divided into electrode tabs. When the electrode tabs are stacked to form a battery, multiple pointed tip portions are welded together and used for welding to the outer electrode tab.

9. A battery, characterized in that: The battery includes a positive polarity electrode structure, a separator, and a negative polarity electrode structure, wherein the positive polarity electrode structure and the negative polarity electrode structure are electrode structures as described in any one of claims 1-8.

10. The battery as claimed in claim 9, characterized in that: The line connecting the tip of the pointed portion and the center of the circular portion is the direction of the tab position. The circular portion of the negative polarity is larger than the circular portion of the positive polarity. The angle between the tab position of the circular portion of the positive polarity and the tab position of the circular portion of the negative polarity is in the range of 90° to 270°.

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