Battery pole piece, preparation method thereof and battery

Abstract

The invention belongs to the technical field of battery manufacturing, and particularly relates to a battery pole piece and a preparation method thereof and a battery, the battery pole piece comprises a current collector, an active substance layer and a gluing layer, at least one surface of the current collector is coated with the active substance layer, the gluing layer is arranged on the outer side of the active substance layer, the gluing layer is made of high-temperature-resistant insulation glue, the width of the gluing layer is W1, and the width of the gluing layer is W2. W1 is larger than or equal to 1mm and smaller than or equal to 5mm; the current collector is provided with a coating area and a blank area surrounding the outside of the coating area, the active material layer is arranged in the coating area, the gluing layer is arranged on the blank area and partially lapped on the active material layer to form an overlapping part, the width of the overlapping part is W2, and the relation that W2 is larger than 0 mm and smaller than or equal to 0.5 mm is met. According to the invention, the gluing layer of the high-temperature-resistant insulating glue which is firmly adhered to the current collector is prepared at the position, needing to be cut, of the pole piece, and the gluing layer is firmly adhered to the current collector due to good viscosity, so that the problems of powder falling, material falling and burrs of the active substance layer of the pole piece in the slitting or die cutting process are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery manufacturing, and in particular relates to a battery pole piece and a preparation method thereof, and a battery. Background Art

[0002] Currently, sodium-ion battery or lithium-ion battery pole pieces need to be cut and die-cut into the final pole piece size in the positive and negative active coating areas after coating and roller pressing. However, powder loss, material loss, burrs and other undesirable phenomena will inevitably occur at the edges of the pole piece cuts. These problems will in turn cause a series of performance problems such as short circuits in the battery, rapid voltage drop, and even heat and fire.

[0003] At present, solutions to problems such as powder loss and material loss mostly start from improving the adhesion of the electrode, which requires a balance between the electrode processability and the battery cell performance, and the overall effect is not ideal; and solving the burr problem basically starts from the characteristics of the cutting edge, which will also affect the cost and life of the tool, and the sustainability is not good; some also adopt the method of brushing the sheet, but it is inefficient and has poor controllability. Summary of the invention

[0004] The purpose of the present invention is to provide a battery pole piece to address the deficiencies of the prior art, and to prepare a high-temperature resistant insulating coating layer that is firmly bonded to the current collector at the position where cutting is required. The good viscosity enables it to adhere firmly to the current collector to prevent the active coating of the pole piece from losing powder, material and burrs during the slitting or die-cutting process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A battery pole piece, comprising a current collector, an active material layer and a coating layer, wherein at least one side of the current collector is coated with the active material layer, the coating layer is arranged outside the active material layer, the coating layer is made of high temperature resistant insulating glue, the coating layer has a width W1, and satisfies the relationship: 1mm≤W1≤5mm; specifically, the coating layer has a width of 1mm, 2mm, 3mm, 4mm, 5mm, etc.;

[0007] The current collector is provided with a coating area and a blank area surrounding it, the active material layer is provided in the coating area, the glue layer is provided on the blank area and partially overlaps the active material layer to form an overlapping portion, the width of the overlapping portion is W2, and satisfies the relationship: 0mm<W2≤0.5mm; specifically, the width of the overlapping portion is 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5mm, etc.

[0008] When preparing the above-mentioned battery pole piece, the current collector used is a continuously wound foil, on which the active material layer and the adhesive layer can be evenly spaced, and the blank area is between two adjacent active material layers, wherein the adjacent adhesive layers can also be continuously sprayed. After the required pre-material is obtained from the continuous foil, it can be subsequently processed and cut into a single battery pole piece.

[0009] Preferably, the high temperature resistant insulating glue is made of polyimide (PI), which can withstand high temperatures of more than 400°C in a short period of time, and has a long-term use temperature range of -200°C to 300°C. Polyimide (PI) is an aromatic heterocyclic polymer with repeated phthalimide groups in the main chain of the molecule, and is one of the best heat-resistant varieties of engineering plastics at present. The main varieties of polyimide are benzene-type polyimide, ether anhydride-type polyimide, polyamide-imide and maleic anhydride-type polyimide. Polyimide has excellent temperature performance, a wide range of applications, good chemical corrosion resistance and radiation resistance, and is non-toxic. It has excellent insulation performance and good flame retardant performance, a dielectric constant between 2.5-3.4, and a tensile strength of ≥120MPa. The high temperature resistant insulating glue used as the coating layer here can significantly improve the powder and material loss problems of the active material layer of the positive and negative electrodes during the cutting process.

[0010] Preferably, the thickness of the adhesive layer is 1-30 μm. Specifically, the thickness of the adhesive layer is 1 μm, 2 μm, 3 μm, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc.

[0011] Preferably, the width of the blank area is W3, satisfying the relationship: 5mm≤W3≤45mm, and a tab is provided in the blank area in the width direction of the current collector. Specifically, the width of the blank area is 5mm, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, etc.

[0012] Preferably, the blank area includes a first blank area and a second blank area, the blank area includes a first blank area and a second blank area, the first blank area is arranged outside the current collector along the length direction, the second blank area is arranged outside the current collector along the width direction, and the pole ear is arranged in the second blank area. The first blank area and the second blank area are arranged around the coating area so that the glue layer thereon can surround the active material layer coated in the coating area, and the glue layer is also coated at the junction of the pole ear and the coating area. The width of the first blank area and the width of the second blank area can be different widths.

[0013] Preferably, a cutting area is provided on the blank area, and the cutting area is provided on a side away from the coating area, and the spacing distance between the cutting area and the overlapping part is L, satisfying the relationship: 0.5mm≤L≤3.5mm. Specifically, the spacing distance between the cutting area and the overlapping part is 0.5mm, 1mm, 1.5mm, 2mm, 3mm and 3.5mm, etc., and the spacing distance can be adjusted according to the width of the adhesive layer and the width of the overlapping part, so as to cut the empty foil part of the blank area.

[0014] A method for preparing the battery electrode sheet described in any of the above schemes comprises the following steps:

[0015] Step 1: coating the positive electrode active material or the negative electrode active material in the coating area on the front and back sides of the current collector of the continuous substrate by an intermittent coating method, and coating the blank area on the front and back sides of the current collector with a coating layer by a coating machine and an auxiliary dispensing mechanism or a spraying mechanism; the width W1 of the coating layer is 1mm≤W1≤5mm, and the width W2 of the overlapping portion formed by the coating layer and the active material layer is 0mm<W2≤0.5mm;

[0016] Step 2: The current collector together with the active material layer and the adhesive layer thereon are dried and solidified in a high-temperature oven, and then rolled and compacted;

[0017] Step 3: Locate the cutting knife landing point by adjusting the cutting tool position or capturing the position of the coating layer through the CCD vision system, cut the knife in the corresponding cutting area, cut out the tabs in the blank area, and then cut the two adjacent pole pieces to obtain a single battery pole piece with tabs. Preferably, the coating layer in step 1 includes high temperature resistant insulating glue and solvent, and the high temperature resistant insulating glue is dissolved in the solvent to prepare a high temperature resistant insulating glue liquid and then sprayed onto the current collector.

[0018] Preferably, the solvent is N-methylpyrrolidone (NMP) or N,N-dimethylformamide (DMF).

[0019] Preferably, the solid content of the high temperature resistant insulating adhesive is 30%-60%. Specifically, the solid content of the high temperature resistant insulating adhesive is 30%, 40%, 50% and 60%.

[0020] A battery comprises a battery cell formed by stacking and winding a first pole sheet, a separator and a second pole sheet, wherein the first pole sheet and the second pole sheet have opposite polarities, and the first pole sheet and the second pole sheet are both battery pole sheets described in any one of the above or battery pole sheets made by any one of the above methods for preparing a battery pole sheet.

[0021] Compared with the prior art, the beneficial effect of the present invention lies in: by preparing a coating layer of high-temperature resistant insulating glue that is firmly bonded to the current collector at the position where the electrode (including the positive electrode and the negative electrode) needs to be cut, the good viscosity enables it to adhere firmly to the current collector to prevent the active material layer of the electrode from losing powder, material and burrs during the slitting or die-cutting process.

[0022] Good insulation can effectively avoid short circuits in the battery cell caused by poor coating or burrs. The high temperature resistance ensures that the coating layer will not fail and fall off due to heat generated by high-speed cutting or heat accumulation during charging and discharging of the battery cell, thereby ensuring that the battery cell can perform better in terms of performance and safety.

[0023] On the other hand, the hardness of this high-temperature resistant insulating coating is much lower than that of the positive and negative electrode active material layers, so the cutting edge is not easy to be blunted, and the problem of collector burrs can be avoided. At the same time, it can effectively extend the life of the cutter and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the pole piece structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the pole piece structure before cutting of the present invention.

[0026] Figure 3 yes Figure 2 A partial enlarged view of point A.

[0027] Figure 4 It is a schematic diagram of the current collector structure of the present invention.

[0028] Reference numerals:

[0029] 1. current collector, 11. coating area, 12. blank area, 121. first blank area, 122. second blank area, 13. tab, 14. cutting area;

[0030] 2. Active material layer;

[0031] 3. Glue coating;

[0032] 4. Overlapping part. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-4A battery electrode provided by the present invention comprises a current collector 1, an active material layer 2 and a coating layer 3. The current collector 1 is a continuous foil material. The active material layer 2 is evenly coated on both sides of the current collector 1. The coating layer 3 is arranged on the outside of the active material layer 2. The material of the coating layer 3 is a high-temperature resistant insulating adhesive. The high-temperature resistant insulating adhesive is polyimide (PI). The width of the coating layer 3 is W1, which satisfies the relationship: 1mm≤W1≤5mm; the thickness of the coating layer 3 is 1-30μm.

[0035] The above-mentioned current collector 1 is provided with a coating area 11 and a blank area 12 surrounding it, the active material layer 2 is provided in the coating area 11, the glue layer 3 is provided on the blank area 12 and partially overlaps the active material layer 2 to form an overlapping portion 4, the width of the overlapping portion 4 is W2, and satisfies the relationship: 0mm<W2≤0.5mm.

[0036] The width of the blank area 12 is W3, which satisfies the relationship: 5mm≤W3≤45mm, and the tab 13 is arranged in the blank area 12 in the width direction of the current collector 1. The blank area 12 includes a first blank area 121 and a second blank area 122, the first blank area 121 is arranged on the outer side of the current collector 1 along the length direction, the second blank area 122 is arranged on the outer side of the current collector 1 along the width direction, and the tab 13 is arranged in the second blank area 122. A cutting area 14 is arranged on the blank area 12, and the cutting area 14 is arranged on the side away from the coating area 11. The spacing distance between the cutting area 14 and the overlapping part 4 is L, which satisfies the relationship: 0.5mm≤L≤3.5mm.

[0037] The following preparation process is used to make the battery electrode, including the following steps:

[0038] Step 1: Use intermittent coating to coat the positive electrode active material or the negative electrode active material in the coating area 11 on the front and back sides of the current collector 1 of the continuous substrate, and at the same time, coat the blank area 12 on the front and back sides of the current collector 1 with a coating machine and an auxiliary dispensing mechanism or a spraying mechanism; the width W1 of the coating layer 3 is 1-5mm, and the width W2 of the overlapping part 4 formed by the coating layer 3 and the active material layer 2 is 0-0.5mm; wherein, the coating layer 3 includes a high temperature resistant insulating glue and a solvent, and the high temperature resistant insulating glue is dissolved in a solvent to prepare a high temperature resistant insulating glue liquid and then sprayed onto the current collector 1. Specifically, the solvent is N-methylpyrrolidone (NMP) or N, N-dimethylformamide (DMF). The solid content of the high temperature resistant insulating glue liquid is 30%-60%.

[0039] Step 2: The current collector 1 together with the active material layer 2 and the adhesive layer 3 thereon are dried and solidified in a high-temperature oven, and then rolled and compacted.

[0040] Step 3: Locate the cutting tool landing point by adjusting the cutting tool position or by capturing the position of the coating layer 3 through the CCD vision system, place the knife in the corresponding cutting area 14, and cut out the tab 13 in the blank area, and then cut the two adjacent pole pieces to obtain a single battery pole piece with a tab 13.

[0041] Embodiment 1:

[0042] A sodium nickel iron manganate positive electrode sheet was prepared on the current collector 1, and no adhesive layer 3 was provided outside the active material layer 2. The electrode sheet was directly cut, and the peeling effect and the electrode sheet cutting effect were observed and recorded.

[0043] Embodiment 2:

[0044] A sodium nickel iron manganate positive electrode sheet is prepared on a current collector 1, wherein a coating layer 3 is provided outside the active material layer 2, wherein the solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 30%-40%, the viscosity is 6000-10000 mPa·s, and the width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After the preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0045] Embodiment 3:

[0046] The preparation of Example 3 is basically the same as that of Example 2, except that the solid content is 40%-50% and the viscosity is 10000-14000 mPa·s.

[0047] Embodiment 4:

[0048] The preparation of Example 4 is basically the same as that of Example 2, except that the solid content is 50%-60% and the viscosity is 14000-20000 mPa·s.

[0049] Embodiment 5:

[0050] The preparation of Example 5 is basically the same as that of Example 2, except that the width of the adhesive layer 3 is less than 1 mm.

[0051] Embodiment 6:

[0052] The preparation of Example 6 is basically the same as that of Example 2, except that the solvent of the high temperature resistant insulating glue used in the glue layer 3 is DMF.

[0053] Embodiment 7:

[0054] A sodium iron pyrophosphate positive electrode sheet was prepared on the current collector 1, and no adhesive layer 3 was provided outside the active material layer 2. The electrode sheet was directly cut, and the peeling effect and the electrode sheet cutting effect were observed and recorded.

[0055] Embodiment 8:

[0056] A sodium iron pyrophosphate positive electrode sheet is prepared on a current collector 1, wherein a coating layer 3 is provided outside the active material layer 2. The solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 40%-50%, and the viscosity is 10000-14000 mPa·s. The width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0057] Embodiment 9:

[0058] A hard carbon negative electrode sheet is prepared on the current collector 1, and no adhesive layer 3 is provided outside the active material layer 2. The electrode sheet is directly cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0059] Embodiment 10:

[0060] A hard carbon negative electrode sheet is prepared on the current collector 1, and a coating layer 3 is provided outside the active material layer 2. The solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 30%-40%, and the viscosity is 6000-10000mPa·s. The width of the coating layer 3 is 1-5mm, and the thickness is 1-30μm. After preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0061] Embodiment 11:

[0062] A lithium nickel cobalt manganese oxide positive electrode sheet was prepared on the current collector 1, and no glue layer 3 was provided outside the active material layer 2. The electrode sheet was directly cut, and the peeling effect and the electrode sheet cutting effect were observed and recorded.

[0063] Embodiment 12:

[0064] A nickel-cobalt-manganese-oxide lithium positive electrode sheet is prepared on a current collector 1, and a coating layer 3 is provided outside the active material layer 2. The solvent of the high-temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 40%-50%, and the viscosity is 10000-14000 mPa·s. The width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0065] Embodiment 13:

[0066] A lithium iron phosphate positive electrode sheet is prepared on the current collector 1, and no adhesive layer 3 is provided outside the active material layer 2. The electrode sheet is directly cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0067] Embodiment 14:

[0068] A lithium iron phosphate positive electrode sheet is prepared on a current collector 1, wherein a coating layer 3 is provided outside the active material layer 2. The solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 40%-50%, and the viscosity is 10000-14000 mPa·s. The width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After the preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0069] Embodiment 15:

[0070] A lithium cobalt oxide positive electrode sheet is prepared on the current collector 1, and no adhesive layer 3 is provided outside the active material layer 2. The electrode sheet is directly cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0071] Embodiment 16:

[0072] A lithium cobalt oxide positive electrode sheet is prepared on a current collector 1, wherein a coating layer 3 is provided outside the active material layer 2. The solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 40%-50%, and the viscosity is 10000-14000 mPa·s. The width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After the preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0073] Embodiment 17:

[0074] A lithium manganese oxide positive electrode sheet is prepared on the current collector 1, and no glue layer 3 is provided outside the active material layer 2. The electrode sheet is directly cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0075] Embodiment 18:

[0076] A lithium manganese oxide positive electrode sheet is prepared on a current collector 1, wherein a coating layer 3 is provided outside the active material layer 2, wherein the solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 40%-50%, the viscosity is 10000-14000 mPa·s, and the width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After the preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0077] Embodiment 19:

[0078] A graphite negative electrode sheet is prepared on the current collector 1, and no adhesive layer 3 is provided outside the active material layer 2. The electrode sheet is directly cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0079] Embodiment 20:

[0080] A graphite negative electrode sheet is prepared on a current collector 1, and a coating layer 3 is provided outside the active material layer 2. The solvent of the high temperature resistant insulating glue used in the coating layer 3 is NMP, the solid content is 30%-40%, and the viscosity is 6000-10000 mPa·s. The width of the coating layer 3 is 1-5 mm, and the thickness is 1-30 μm. After preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0081] Embodiment 21:

[0082] A silicon-based negative electrode sheet is prepared on the current collector 1, and no adhesive layer 3 is provided outside the active material layer 2. The electrode sheet is directly cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0083] Embodiment 22:

[0084] A silicon-based negative electrode sheet is prepared on a current collector 1, wherein an adhesive layer 3 is provided outside the active material layer 2. The solvent of the high temperature resistant insulating adhesive used in the adhesive layer 3 is NMP, the solid content is 30%-40%, and the viscosity is 6000-10000 mPa·s. The width of the adhesive layer 3 is 1-5 mm, and the thickness is 1-30 μm. After preparation, the electrode sheet is cut, and the peeling effect and the electrode sheet cutting effect are observed and recorded.

[0085] The corresponding electrode pieces were cut and prepared for each of the above embodiments, and the following results were obtained:

[0086]

[0087]

[0088] Through the observation and statistics of the peeling effect and slitting or die-cutting effect of the above embodiments, it can be seen that

[0089] 1. When the active material layer 2 is provided with a coating layer 3 of high temperature resistant insulating glue, it is obvious that it has an excellent protective effect, can effectively avoid the problems of powder loss, material loss and burrs generated during the cutting process, and can firmly bond the active material layer 2 to the current collector 1 without peeling.

[0090] 2. When the solid content of the prepared high temperature resistant insulating glue is between 30% and 60%, good use effect can be achieved.

[0091] 3. When the solvent used is NMP or DMF, it can achieve good protection effect.

[0092] 4. When the width of the adhesive layer 3 is less than 1 mm, powder or material may fall off with probability, so the preferred coating width range of the adhesive layer 3 is 1-5 mm.

[0093] 5. The technical solution of the present invention is applicable to lithium batteries and sodium batteries, and has excellent use effect whether it is used for positive electrode sheets or negative electrode sheets.

[0094] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A battery pole piece, characterized in that: The invention comprises a current collector (1), an active material layer (2) and a coating layer (3), wherein at least one side of the current collector (1) is coated with the active material layer (2), the coating layer (3) is arranged outside the active material layer (2), the coating layer (3) is made of high temperature resistant insulating glue, the coating layer (3) has a width W1, and satisfies the relationship: 1 mm ≤ W1 ≤ 5 mm; The current collector (1) is provided with a coating area (11) and a blank area (12) surrounding the coating area, the active material layer (2) is provided in the coating area (11), the adhesive layer (3) is provided on the blank area (12) and partially overlaps the active material layer (2) to form an overlapping portion (4), the width of the overlapping portion (4) is W2, and satisfies the relationship: 0mm<W2≤0.5mm.

2. The battery pole piece according to claim 1, characterized in that: The high temperature resistant insulating adhesive is made of polyimide (PI), and the high temperature resistant insulating adhesive can withstand high temperatures of more than 400°C in a short period of time, and the long-term use temperature range is -200°C to 300°C.

3. The battery pole piece according to claim 1, characterized in that: The thickness of the adhesive coating layer (3) is 1-30 μm.

4. The battery pole piece according to claim 1, characterized in that: The width of the blank area (12) is W3, satisfying the relationship: 5mm≤W3≤45mm, and a pole ear (13) is provided in the blank area (12) in the width direction of the current collector (1).

5. The battery pole piece according to claim 4, characterized in that: The blank area (12) comprises a first blank area (121) and a second blank area (122), wherein the first blank area (121) is arranged on the outside of the current collector (1) along the length direction, and the second blank area (122) is arranged on the outside of the current collector (1) along the width direction, and the electrode tab (13) is arranged in the second blank area (122).

6. The battery pole piece according to claim 1, characterized in that: A cutting area (14) is provided on the blank area (12), and the cutting area (14) is provided on a side away from the coating area (11). The spacing distance between the cutting area (14) and the overlapping portion (4) is L, satisfying the relationship: 0.5 mm ≤ L ≤ 3.5 mm.

7. A process for preparing a battery pole piece according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: coating the positive electrode active material or the negative electrode active material in the coating area (11) on the front and back sides of the current collector (1) of the continuous substrate by an intermittent coating method, and at the same time coating the blank area (12) on the front and back sides of the current collector (1) with a coating machine and an auxiliary dispensing mechanism or a spraying mechanism; the width W1 of the coating layer (3) is 1mm≤W1≤5mm, and the width W2 of the overlapping portion (4) formed by the coating layer (3) and the active material layer (2) is 0mm<W2≤0.5mm; Step 2: The current collector (1) together with the active material layer (2) and the adhesive layer (3) thereon are dried and solidified in a high-temperature oven, and then rolled and compacted; Step 3: The cutting knife landing point is located by adjusting the position of the cutting tool or by capturing the position of the coating layer (3) through a CCD vision system, the cutting knife is placed in the corresponding cutting area (14), and the tabs (13) are cut out in the blank area, and then two adjacent tabs are cut to obtain a single battery tab (13).

8. The process for preparing a battery pole piece according to claim 7, characterized in that: The coating layer (3) in step 1 comprises high temperature resistant insulating glue and a solvent. The high temperature resistant insulating glue is dissolved in the solvent to prepare a high temperature resistant insulating glue liquid, which is then sprayed onto the current collector (1).

9. The process for preparing a battery pole piece according to claim 8, characterized in that: The solvent is N-methylpyrrolidone (NMP) or N,N-dimethylformamide (DMF).

10. The process for preparing a battery pole piece according to claim 9, characterized in that: The solid content of the high temperature resistant insulating adhesive is 30%-60%.

11. A battery, comprising a battery cell formed by stacking a first pole piece, a separator and a second pole piece, wherein the first pole piece and the second pole piece have opposite polarities, characterized in that: The first pole sheet and the second pole sheet are both the battery pole sheet according to any one of claims 1 to 6 or the battery pole sheet made according to the method for making the battery pole sheet according to any one of claims 7 to 10.

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