Electrode plate and process equipment

Abstract

The utility model discloses an electrode plate and process equipment. The electrode plate comprises a plurality of electrode plate bodies, a plurality of tabs and light curing glue. The pole piece bodies are connected with one another, and at least one to-be-cut area is formed by the multiple pole piece bodies; the plurality of tabs are respectively connected with the plurality of pole piece bodies, and the to-be-cut area is arranged between two adjacent tabs; the light solid glue is arranged in the to-be-cut area. According to the electrode plate provided by the embodiment of the utility model, the photo-curing adhesive is sprayed on the to-be-cut area arranged on the electrode plate, and the excellent characteristics of the photo-curing adhesive are utilized, so that the viscosity can be maintained for a long time, the aging time is prolonged, and the service life of the electrode plate using the photo-curing adhesive is prolonged. Meanwhile, the light curing adhesive is arranged in the to-be-cut area, so that cutting burrs can be effectively reduced, chippings can be effectively prevented from falling off, piercing damage to the diaphragm in the winding process caused by the cutting burrs is reduced, the risk of short circuit during winding of the positive electrode plate and the negative electrode plate is reduced, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electrode sheet and process equipment. Background Art

[0002] As the energy storage industry continues to expand, the application scenarios for lithium-ion batteries are expanding, and demand is increasing significantly. To meet the growing scale of electric energy storage and the need for large-scale, long-duration energy storage solutions, the industry consensus is that ultra-large-capacity battery cells are the key to increasing the volumetric energy density of energy storage systems, reducing component counts, and lowering manufacturing costs. However, with the increase in battery cell capacity and the trend toward thinner separators to increase energy density, the safety risks associated with cutting burrs are escalating.

[0003] In the existing winding process of lithium-ion battery production, the positive and negative electrode sheets are cut with a cutter and then wound into a core with the separator. During the cutting process, horizontal / vertical burrs are easily generated on the cut ends of the electrode sheets, which may pierce the separator and cause a short circuit inside the battery cell or even a fire. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, one purpose of the present invention is to provide an electrode sheet that has a longer service life by providing a light-curing adhesive.

[0005] Another object of the present invention is to provide a process equipment for manufacturing the above-mentioned electrode sheet.

[0006] The electrode sheet according to the embodiment of the first aspect of the present invention includes: multiple electrode bodies, multiple electrode ears, and photocuring glue, the multiple electrode bodies are connected to each other, and the multiple electrode bodies form at least one area to be cut; the multiple electrode ears are respectively connected to the multiple electrode bodies, and the area to be cut is arranged between two adjacent electrode ears; the photocuring glue is arranged in the area to be cut.

[0007] According to the electrode sheet of the present invention, by spraying a light-curing adhesive on the area to be cut on the electrode sheet, the excellent properties of the light-curing adhesive can be utilized to maintain long-term adhesion, extend the aging time, and increase the service life of the electrode sheet using the light-curing adhesive. At the same time, the application of light-curing adhesive in the area to be cut can effectively reduce cutting burrs and prevent the falling of debris, reduce the risk of puncture damage to the separator during the winding process caused by cutting burrs, reduce the risk of shorting the positive and negative electrode sheets during winding, and improve product quality.

[0008] In some embodiments, the photocuring adhesive is provided in the area to be cut along the width direction of the pole piece body, and the width of the photocuring adhesive is greater than the width of the area to be cut.

[0009] In some embodiments, the dimension of the photocurable adhesive along the width direction of the pole piece body is a, and a satisfies: 8mm≤a≤12mm.

[0010] In some embodiments, a dimension of the photocurable adhesive along the thickness direction of the pole piece body is b, and b satisfies: 5 μm≤b≤15 μm.

[0011] In some embodiments, the tab is formed with a marking hole, and the marking hole is used to mark the position of the pole piece body.

[0012] According to the process equipment of the embodiment of the second aspect of the present utility model, the process equipment is used to manufacture the electrode sheet described in any one of the above embodiments.

[0013] In some embodiments, the process equipment includes: a cutting device, the cutting device includes: a cutter and a controller, and the controller communicates with the cutter.

[0014] In some embodiments, the method further includes: a glue coating device, which is arranged upstream of the cutting device to spray light-curing glue on the area of the electrode sheet to be cut.

[0015] In some embodiments, the method further includes: a winding device, which is arranged between the gluing device and the cutting device to wind the electrode sheet.

[0016] In some embodiments, the winding device includes: a position sensor, the position sensor communicates with the controller of the cutting device, a plurality of marking holes are provided on the electrode sheet, and the position sensor is used to identify the marking holes.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 Schematic diagram of an electrode sheet according to an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of a light-curing adhesive according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 100. Electrode sheet;

[0023] 10. Pole body; 11. Area to be cut;

[0024] 20. Tab; 21. Mark the hole position;

[0025] 30. Light curing glue. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 2 The electrode sheet 100 according to an embodiment of the present invention is described. The electrode sheet 100 includes: a plurality of electrode bodies 10 , a plurality of electrode tabs 20 , and a light-curing adhesive 30 .

[0027] Specifically, if Figure 1 As shown, multiple pole piece bodies 10 are connected to each other, and the multiple pole piece bodies 10 form at least one area to be cut 11; multiple pole ears 20 are respectively connected to the multiple pole piece bodies 10, and the area to be cut 11 is arranged between two adjacent pole ears 20; and the photocuring glue 30 is arranged in the area to be cut 11.

[0028] In this embodiment, the electrode sheet 100 is a long strip structure. In the die-cutting process of the electrode sheet 100, the long strip electrode sheet 100 is die-cut to form a plurality of pole sheet bodies 10 connected to each other and pole ears 20 connected to the pole sheet bodies 10. In order to facilitate the automated processing of the electrode sheet 100, a marking hole 21 is formed at the position of the pole ears 20 of the electrode sheet 10. The die-cutting device can form a plurality of pole sheet bodies 10 connected to each other and pole ears 20 connected to the pole sheet bodies 10 according to the preset pole ear 20 spacing, as well as the area to be cut 11 that needs to be cut in the subsequent process. During the die-cutting process or after the die-cutting, a light-curing adhesive 30 can be set on the pole sheet body 10 that needs to be cut, that is, the area to be cut 11, and the light-curing adhesive 30 can be set by spraying, and then cured and attached to the surface of the pole sheet body 10 by light baking.

[0029] The area to be cut 11 is provided between two adjacent pole ears 20, and is generally located on the same pole piece body 10, in order to avoid waste of materials caused by being provided on two pole piece bodies 10. The light-curing glue 30 here is UV glue, that is, ultraviolet curing glue, a light-curing glue 30 that is cured by ultraviolet ray irradiation. UV glue is a single-component, UV shadowless glue that is triggered by sunlight or UV ultraviolet light to quickly cure the glue liquid. It has the characteristics of fast surface drying, fast deep curing speed, low shrinkage, high bonding strength, water resistance and no pollution; high temperature resistance, no solvent, high transparency of the glue film after curing, no fogging, no whitening, no yellowing, excellent electrical insulation and sealing properties.

[0030] According to the electrode sheet 100 of the present invention, by spraying the light-curing adhesive 30 on the to-be-cut region 11 provided on the electrode sheet 100, the excellent properties of the light-curing adhesive 30 are utilized to maintain long-term adhesion, extend the aging time, and increase the service life of the electrode sheet 100 using the light-curing adhesive 30. Furthermore, by providing the light-curing adhesive 30 in the to-be-cut region 11, cutting burrs are effectively reduced and debris is prevented from falling, thereby reducing the risk of puncture damage to the separator during the winding process caused by cutting burrs, reducing the risk of short circuits between the positive and negative electrode sheets 100 during winding, and improving product quality.

[0031] In some embodiments, combined Figure 1 , the photo-curing adhesive 30 is arranged in the area to be cut 11 along the width direction of the electrode body 10, and the width of the photo-curing adhesive 30 is greater than the width of the area to be cut 11. That is, the area to be cut 11 is the position where the cutting device cuts off the electrode sheet 100. When spraying the photo-curing adhesive 30, the width of the photo-curing adhesive 30 is made greater than the width of the area to be cut 11, so that when cutting the electrode sheet 100, at least part of the photo-curing adhesive 30 can be ensured to be located on both sides of the area to be cut 11, that is, at least part of the photo-curing adhesive 30 is located at the end of the electrode sheet 100 after cutting. Therefore, the width of the photo-curing adhesive 30 is greater than the width of the area to be cut 11, so that the burrs of the area to be cut 11 during the cutting process will not at least protrude from the electrode body 10 along the thickness direction of the electrode sheet 100, and can also effectively avoid the falling of debris during cutting, while ensuring the service life of the electrode sheet 100 after assembly.

[0032] Further, if Figure 2 As shown, the dimension of the photo-curing adhesive 30 along the width direction of the electrode body 10 is a, and a satisfies: 8mm≤a≤12mm. If the width of the photo-curing adhesive 30 is less than 8mm, the width of the photo-curing adhesive 30 is small. When the area to be cut 11 is cut, less photo-curing adhesive 30 is left at the end of the electrode sheet 100. The coverage area of the burr is small, and it is easy to pierce the diaphragm between the positive and negative electrode sheets 100, posing a safety hazard. If the width of the photo-curing adhesive 30 is greater than 12mm, the width of the photo-curing adhesive 30 is wide, which affects the ability of the electrode sheet 100 to carry active substances, reduces the power of the electrode sheet 100, and increases the consumption of the photo-curing adhesive 30, thereby increasing costs. In this embodiment, the width of the photo-curing adhesive 30 can be 8mm, 9mm, 10mm, 11mm or 12mm. For example, the width of the photo-curing adhesive 30 is preferably 10mm.

[0033] In this embodiment, the electrode sheet 100 includes a positive electrode sheet 100 and a negative electrode sheet 100, and the processing methods of the positive electrode sheet 100 and the negative electrode sheet 100, as well as the setting position and processing technology of the photocuring glue 30 on the corresponding positive electrode sheet 100 and the negative electrode sheet 100 are the same. When the positive electrode sheet 100 and the negative electrode sheet 100 are die-cut separately, the positive electrode sheet 100, the negative electrode sheet 100 and the diaphragm form a stacked structure for winding, and then the area to be cut 11 is cut to form a single winding core of the finished product. Specifically, the electrode sheet 100 is die-cut to form a plurality of electrode bodies 10 and electrode ears 20 and the area to be cut 11 is determined, and the photocuring glue 30 is sprayed on the area to be cut 11. The positive electrode sheet 100, the negative electrode sheet 100 and the diaphragm sprayed with the photocuring glue 30 are stacked and wound, and cut in a specific area to be cut 11 according to the required length.

[0034] In some embodiments, the dimension of the photocuring adhesive 30 along the thickness direction of the electrode body 10 is b, and b satisfies: 5μm≤b≤15μm. The photocuring adhesive 30 is provided on both sides of the electrode body 10 in the thickness direction, and the thickness of the photocuring adhesive 30 is preferably 10μm. If the thickness of the photocuring adhesive 30 is small, such as less than 5μm, the thickness of the photocuring adhesive 30 is small, and the burrs during the cutting process can easily pierce the diaphragm adjacent to the electrode sheet 100, causing the positive electrode sheet 100 and the negative electrode sheet 100 on both sides of the diaphragm to short-circuit. If the thickness of the photocuring adhesive 30 is large, such as greater than 15μm, the thickness of the photocuring adhesive 30 is large, which is not conducive to winding to form a core after the positive electrode sheet 100, the negative electrode sheet 100 and the diaphragm are stacked, and the density of the core is low. Thus, the thickness of the photocuring adhesive 30 is controlled to ensure that the burrs formed by cutting are not easy to protrude from the photocuring adhesive 30, thereby avoiding puncturing the diaphragm and improving the processing quality of the electrode sheet 100. At the same time, the thickness of the photocuring adhesive 30 is avoided to be too thick, which helps the winding of the electrode sheet 100, increases the density of the core formed by winding the positive electrode sheet 100 and the negative electrode sheet 100, and reduces the volume of the core formed by winding the electrode sheet 100.

[0035] In some embodiments, as Figure 1 As shown, the pole tab 20 is formed with a marking hole 21, and the marking hole 21 is used to mark the position of the pole piece body 10. That is, when the electrode sheet 100 is die-cut, a plurality of pole piece bodies 10 and a plurality of pole tabs 20 are formed, and the pole tabs 20 are connected to the corresponding pole piece bodies 10. Since the electrode sheet 100 is relatively long after die-cutting, it needs to be wound and cut into a plurality of electrode sheets 100 with a smaller length for winding to form a core. In this embodiment, by setting a marking hole 21 on the formed pole tab 20, the cutting position of the cutting device can be controlled by identifying the marking hole 21. Therefore, the setting of the marking hole 21 makes it convenient for the user to selectively cut the length of the electrode sheet 100 according to needs, so as to be used for winding to form cores with different diameters.

[0036] According to the process equipment of the embodiment of the second aspect of the present utility model, the process equipment is used to manufacture the electrode sheet 100 of any one of the above embodiments.

[0037] According to the process equipment of the embodiment of the present invention, the electrode sheet 100 formed by the above-mentioned process equipment can simplify the processing technology of the electrode sheet 100, so that the method of setting the photocuring glue 30 on the electrode sheet 100 is simpler, and the quality of the electrode sheet 100 formed by the processing is higher and the stability is better.

[0038] Specifically, the process equipment includes a cutting device, which includes a cutter and a controller, wherein the controller communicates with the cutter. Specifically, the process equipment can obtain corresponding signals based on the identified marked hole positions 21 and transmit them to the controller. The controller analyzes and processes the corresponding data and controls the cutter to cut the area to be cut 11 to complete the cutting of the corresponding segment of the electrode sheet 100.

[0039] In some embodiments, the process equipment further includes: a glue coating device, which is provided upstream of the cutting device to spray the light-curing glue 30 on the to-be-cut area 11 of the electrode sheet 100. That is, the process equipment further includes a glue coating device, which is provided upstream of the cutting device. It can be understood that the glue coating process is before the cutting process. For example, the light-curing glue 30 is sprayed while the electrode sheet 100 is die-cut to form the electrode body 10 and the electrode tab 20, and then the light-curing glue 30 is cured.

[0040] In some embodiments, the process equipment further includes: a winding device, which is provided between the glue coating device and the cutting device to wind the electrode sheet 100. That is, when processing the electrode sheet 100, after the light curing adhesive 30 sprayed on the electrode sheet 100 is cured, the laminated structure formed by the die-cut and glue-coated positive electrode sheet 100 and the negative electrode sheet 100 and the separator provided between the positive electrode sheet 100 and the negative electrode sheet 100 is wound.

[0041] The winding device includes: a position sensor, which communicates with the controller of the cutting device. A plurality of marking holes 21 are provided on the electrode sheet 100, and the position sensor is used to identify the marking holes 21. In this embodiment, the winding device winds the electrode sheet 100 to form a stacked structure. After the position sensor identifies the marking holes, it transmits the position information to the controller. The controller controls the cutter to cut the electrode sheet 100 based on the acquired information. For example, in the die-cutting process, the spacing dimensions of the tabs 20 are input: D1, D2, ..., DX, and the winding cutting position dimension data is input simultaneously. When the position sensor identifies the first marking hole, it calculates the position of the to-be-cut area 11 of the positive electrode sheet 100 and the negative electrode sheet 100 based on the spacing of the tabs 20. After winding the corresponding length, the cutter is controlled to cut the to-be-cut area 11 at the corresponding position to cut the electrode sheet 100.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0043] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. In the description of the present invention, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0044] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0045] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electrode sheet, characterized in that: include: A plurality of pole piece bodies, the plurality of pole piece bodies are connected to each other, and the plurality of pole piece bodies form at least one area to be cut; A plurality of tabs, each of which is connected to a plurality of electrode bodies, and the area to be cut is located between two adjacent tabs; Light-curing adhesive, the light-curing adhesive is arranged on the area to be cut.

2. The electrode sheet according to claim 1, characterized in that The photocuring adhesive is provided in the area to be cut along the width direction of the pole piece body, and the width of the photocuring adhesive is greater than the width of the area to be cut.

3. The electrode sheet according to claim 1, characterized in that The dimension of the photocurable adhesive along the width direction of the pole piece body is a, and a satisfies: 8mm≤a≤12mm.

4. The electrode sheet according to claim 1, characterized in that The dimension of the photocurable adhesive along the thickness direction of the pole piece body is b, and b satisfies: 5 μm≤b≤15 μm.

5. The electrode sheet according to any one of claims 1 to 4, characterized in that: The pole tab is formed with a marking hole, and the marking hole is used to mark the position of the pole piece body.

6. A process equipment, characterized in that: The process equipment is used to manufacture the electrode sheet according to any one of claims 1 to 5.

7. The process equipment according to claim 6, characterized in that The process equipment includes: a cutting device, and the cutting device includes: cutting knife; A controller is in communication with the cutter.

8. The process equipment according to claim 7, characterized in that: Also includes: A glue coating device is provided upstream of the cutting device to spray light-curing glue on the area of the electrode sheet to be cut.

9. The process equipment according to claim 8, characterized in that Also includes: A winding device is provided between the gluing device and the cutting device to wind the electrode sheet.

10. The process equipment according to claim 9, characterized in that: The winding device includes: a position sensor, the position sensor communicates with the controller of the cutting device, The electrode sheet is provided with a plurality of marking holes, and the position sensor is used to identify the marking holes.

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