A method for preparing a supercapacitor electrode plate

Abstract

The present invention relates to the field of supercapacitors, and specifically relates to a method for preparing a supercapacitor electrode plate, which includes Step 1: taking a first current collector and a second current collector, making grooves on the first current collector, and making through holes on the second current collector; Step 2: mold loading: sequentially loading the first current collector, the separator, and the second current collector into a mold; the separator includes a plurality of support pieces, there is a gap between adjacent support pieces, and the groove of the first current collector in the mold is located at the gap between two support pieces; a glue liquid cavity is provided at the end of the support piece, and a liquid outlet hole is provided at the bottom of the support piece; Step 3: filling: coating the active paste on the surface of the second current collector, and the active paste enters the groove on the first current collector through the through hole on the second current collector; pulling out the separator; Step 4: drying and demolding. Through this solution, the connection method between the active paste layer and the current collector is changed, and the active paste layer and the current collector are connected more firmly and stably.

Description

Technical Field

[0001] The present invention relates to the field of supercapacitors, and particularly to a method for preparing a supercapacitor electrode plate. Background Art

[0002] The supercapacitor electrode plate is an important structure in a supercapacitor. The supercapacitor electrode plate includes a current collector and an active slurry layer coated on the current collector. The active slurry layer is a layered structure formed after the active slurry coated on the current collector is dried. Currently, the active slurry layer is usually only located on one side of the current collector. Because of this, the material of the side of the current collector without the active slurry layer can contact the material of the supercapacitor housing. The material of the supercapacitor housing is the same as that of the current collector, usually aluminum, and there is no potential difference, so there is no electrochemical corrosion, which can improve the reliability of the supercapacitor in use.

[0003] In order to improve the coating stability of the active slurry layer on the current collector and prevent the active slurry layer from falling off the current collector, an adhesive needs to be applied between the active slurry layer and the current collector. However, this connection method has the following disadvantages: 1. Since the active slurry layer is formed by drying the active slurry, and the raw material of the active slurry is in powder form, the surface of the active slurry layer has more or less granular dust. The existence of the dust makes the adhesion between the active slurry layer and the current collector small, and the connection effect between the active slurry layer and the current collector is not good. 2. In order to improve the bonding effect, if the content of the applied adhesive is too much, it will affect the reversible capacity of the supercapacitor. Summary of the Invention

[0004] The present invention aims to provide a supercapacitor electrode plate and a preparation method thereof to change the connection method between the active slurry layer and the current collector and solve the problems in the background art.

[0005] To achieve the above object, the present invention adopts the following technical solution: A supercapacitor electrode plate includes a first current collector, a second current collector, and an active slurry layer. The second current collector is located between the first current collector and the active slurry layer. The first current collector is provided with a plurality of grooves, and the second current collector is provided with a plurality of through holes. The through holes and the grooves are opposite to each other, and the orthographic projection of the edge of the through hole on the first current collector is located in the groove. The active slurry layer passes through the through holes and fills the grooves, and the part of the active slurry layer located in the grooves abuts against the edge of the through hole. An adhesive is provided between the first current collector and the second current collector.

[0006] The principle and advantages of this solution are as follows: In this solution, the first current collector and the second current collector are connected together by an adhesive. The active slurry layer passes through the through-hole and is located in the groove, so that there are active slurry layers on both sides of the through-hole. Since the orthographic projection of the edge of the through-hole on the first current collector is located in the groove, the part of the active slurry layer located in the groove can abut against the edge of the through-hole, that is, the edge of the through-hole is clamped by the active slurry layers on both sides of the through-hole, and the edge of the through-hole realizes the connection function for the active slurry layer, thus realizing the connection and fixation of the active slurry layer and the second current collector, and the active slurry layer is not easily detached from the second current collector. At the same time, since the first current collector and the second current collector are connected together by an adhesive, in this way, the first current collector, the second current collector and the active slurry layer are connected as a whole.

[0007] With the brand-new structure of this solution, the connection between the active slurry layer and the second current collector does not use an adhesive for connection, which can avoid the problem that the adhesion between the active slurry layer and the current collector is small due to a small amount of granular powder ash on the surface of the active slurry layer, and the connection effect between the active slurry layer and the current collector by the adhesive is not good. At the same time, the adhesive is used to connect the first current collector and the second current collector. Since both the first current collector and the second current collector are metal foils, there are no impurities such as granular powder ash on the surfaces of the first current collector and the second current collector. Therefore, the surfaces of the first current collector and the second current collector are smoother and cleaner than the surface of the active slurry layer, and the adhesive has a better bonding effect on the first current collector and the second current collector. Therefore, when using the adhesive for bonding, it is not necessary to use too much adhesive, thus having a smaller impact on the reversible capacity of the supercapacitor. In addition, the active slurry layer in this solution is arranged on one side of the first current collector, not on both sides of the first current collector. The side of the first current collector without the active slurry layer can be in direct contact with the outer shell of the supercapacitor. The outer shell of the supercapacitor and the first current collector are made of the same material, which can avoid the occurrence of electrochemical corrosion.

[0008] Preferably, as an improvement, the edge of the through-hole is bent towards the groove. Thus, the bending direction of the edge of the through-hole is opposite to the direction in which the active slurry layer detaches, which can hinder the detachment of the active slurry layer and improve the firm stability of the active slurry layer on the current collector.

[0009] Preferably, as an improvement, the adhesive is located between the first current collector and the second current collector to form an adhesive layer. There are multiple adhesive layers arranged in sequence, and there are gaps between adjacent adhesive layers. Thus, the entire side surfaces of the first current collector and the second current collector are not completely coated with the adhesive, which is beneficial to reducing the usage amount of the adhesive and further reducing the impact on the reversible capacity of the supercapacitor.

[0010] Preferably, as an improvement, the composition of the active slurry layer includes graphene oxide, porous graphene, carbon nanotubes, binder, conductive carbon black and activated carbon.

[0011] The components of the current active slurry layer mostly adopt components such as graphene, carbon nanotubes, and porous carbon fibers. Supercapacitors prepared using such materials have excellent electrical conductivity. However, when using graphene, due to the easy agglomeration of graphene and poor dispersion effect, the capacitance, energy density, and power density of the supercapacitor are affected.

[0012] Therefore, in this solution, porous graphene is added. The porous graphene is processed by deep processing using the microwave method, which can remove the impurity functional groups on the graphene sheets, improve the specific surface area of graphene, and increase the energy density of the supercapacitor. In addition, graphene oxide and carbon nanotubes are also added in this solution. Graphene oxide plays an auxiliary dispersion role and improves the dispersion effect of graphene; the mixed use of carbon nanotubes and graphene oxide can improve the conductivity of the supercapacitor electrode.

[0013] A preparation method for preparing the above-mentioned supercapacitor electrode plate includes the following steps:

[0014] Step 1, prepare the first current collector and the second current collector: Take the first current collector and the second current collector, and use the laser drilling method to punch grooves on the first current collector and through holes on the second current collector;

[0015] Step 2, mold loading: Sequentially load the first current collector, the separator, and the second current collector into the mold, and the grooves on the first current collector and the through holes on the second current collector are opposite; the separator includes a plurality of support pieces, and there is a gap between adjacent support pieces. The groove on the first current collector in the mold is located at the gap between two support pieces, and the width of the groove is equal to the width of the gap between adjacent support pieces; a glue cavity is provided at the end of the support piece, and a liquid outlet hole communicating with the glue cavity is provided at the bottom of the support piece;

[0016] Step 3, filling: Coat the active slurry on the surface of the second current collector in the direction from the end of the support piece provided with the glue cavity to the other end. The active slurry enters the groove on the first current collector through the through hole on the second current collector; while coating the active slurry, the separator is withdrawn from between the first current collector and the second current collector in the direction from the end of the support piece provided with the glue cavity to the other end;

[0017] Step 4, drying and demolding: Put the mold in step 3 and the first current collector, the second current collector, and the active slurry in the mold into a drying oven for drying. The drying time is 3h, and the drying temperature is 60°C; after the drying process, the active slurry dries and becomes an active slurry layer;

[0018] After drying, the mold, the first current collector, the second current collector, and the active slurry layer located in the mold are taken out of the drying oven and demolded. The first current collector, the second current collector, and the active slurry layer after demolding are connected together to form a supercapacitor electrode plate.

[0019] The preparation method in this solution has the following beneficial effects: 1. It can prepare the supercapacitor electrode plate in this application, changes the connection method between the active slurry layer and the current collector, and solves the problems in the background technology.

[0020] 2. In step 2, the separator includes multiple support pieces, and each support piece is provided with a glue cavity. The bottom of the support piece is provided with a liquid outlet hole communicating with the glue cavity. In this way, the glue cavity is filled with an adhesive. In step 3, when the separator is pulled out from between the first current collector and the second current collector in the direction from the end of the support piece with the glue cavity to the other end, the adhesive will leak onto the first current collector through the liquid outlet hole. Under the movement of the support piece, the adhesive is evenly smeared. The support piece has the function of evenly smearing the adhesive, and at the same time, there are multiple support pieces, which can smear the adhesive in different places. Since the groove of the first current collector in the mold is located at the gap between two support pieces, this can prevent the support piece from blocking the groove and hindering the active slurry from entering the groove.

[0021] 3. The support piece is located between the first current collector and the second current collector, and the support piece plays a role in supporting the second current collector, so that the first current collector and the second current collector can be separated, so that there is a small gap between the first current collector and the second current collector, and the edge of the through hole will not block the inside of the groove, which is convenient for the active slurry to enter the groove through the through hole, and avoids the first current collector and the second current collector being closely attached to each other, which is not conducive to the active slurry entering the groove through the through hole.

[0022] Preferably, as an improvement, there are multiple liquid outlet holes on each support piece and they are arranged along the width direction of the support piece. Thus, when the support piece is pulled and moved along the length direction of the support piece, the adhesives coming out of the liquid outlet holes will not overlap and gather together, so as to realize the sequential arrangement of the adhesive layers between the first current collector and the second current collector, and there is a gap between adjacent adhesive layers.

[0023] Preferably, as an improvement, the inner wall of the liquid outlet hole close to the groove is inclined, the bottom of the inclined inner wall is close to the groove, and the top of the inclined inner wall is far from the groove.

[0024] The active paste layer can be located on the current collector because the edge of the through hole is connected to the active paste layer. Therefore, the force borne by the edge of the through hole is relatively large, and the load on the edge of the through hole is large. Therefore, it is necessary to apply a certain amount of adhesive around the groove between the first current collector and the second current collector to prevent the first current collector and the second current collector from separating due to the large force on the edge of the through hole and the insufficient adhesive force at the groove. The conventional liquid outlet hole has a certain wall thickness, and the existence of the wall thickness will occupy the space around the groove, thus affecting the application of the adhesive around the groove. To solve this problem, in this solution, the inner wall of the liquid outlet hole close to the groove is set to be inclined, and the bottom of the inclined inner wall is close to the groove, so as to reduce the influence of the wall thickness at the bottom of the liquid outlet hole, reduce the space occupied by the bottom of the liquid outlet hole wall, enable the adhesive to be applied to the groove, and enable the first current collector and the second current collector to be bonded with the adhesive at the groove, which is beneficial to improving the connection firmness between the first current collector and the second current collector around the groove. At the same time, the top of the inclined inner wall is far from the groove, so that the side wall top of the liquid outlet hole close to the groove has a certain thickness, which can support the second current collector to a certain extent.

[0025] Preferably, as an improvement, in step 3, when the active paste is coated on the through hole, increase the downward pressing force. Thus, by increasing the downward pressing force, the edge of the through hole can be bent downward.

[0026] Preferably, as an improvement, a plurality of support piece channels are provided on the side wall of the mold, and the support piece channels communicate with the cavity of the mold. The setting of the support piece channels enables the support pieces to be inserted into the cavity of the mold through the support piece channels and move the separator, and the support pieces move in the support piece channels.

[0027] Preferably, as an improvement, the separator is a metal sheet. Since the separator is sheet-shaped and relatively thin, the separator made of metal has a certain hardness, is not easily damaged or bent, and has a long service life. Description of the Drawings

[0028] Figure 1 It is a front sectional view of a supercapacitor electrode plate.

[0029] Figure 2 It is a front sectional view of the first current collector, the separator and the second current collector in the mold.

[0030] Figure 3 It is Figure 2 A partial enlarged view of the left end in the drawing.

[0031] Figure 4 It is a top view of the separator.

[0032] Figure 5 It is a top view of the mold. Detailed implementation manners

[0033] The following is a further detailed description through specific implementation manners:

[0034] The reference numerals in the accompanying drawings of the specification include: the first current collector 1, the second current collector 2, the active slurry layer 3, the adhesive layer 4, the edge 5, the through hole 6, the groove 7, the support piece 8, the glue liquid cavity 9, the liquid outlet hole 10, the separator 11, the mold 12, the chamber 13, the support piece channel 14, and the inclined inner wall 15.

[0035] Example 1

[0036] Basically as shown in the attached Figures 1-5 drawing.

[0037] A supercapacitor electrode plate includes a first current collector 1, a second current collector 2, and an active slurry layer 3. In this example, both the first current collector 1 and the second current collector 2 are aluminum foils. The thickness of the aluminum foil is 0.1 mm. The second current collector 2 is located between the first current collector 1 and the active slurry layer 3. The first current collector 1 is provided with a plurality of circular grooves 7. The depth of the groove 7 is 0.01 - 0.05 mm, and the diameter of the groove 7 is 0.5 cm. The second current collector 2 is provided with a plurality of through holes 6. The diameter of the through hole 6 is 0.3 cm. The centers of the through holes 6 and the grooves 7 are opposite. Since the diameter of the through hole 6 is smaller than the diameter of the groove 7, the projection of the edge 5 of the through hole 6 on the first current collector 1 is located in the groove 7.

[0038] The active slurry layer 3 is located on the second current collector 2. The active slurry layer 3 passes through the through holes 6 and fills the grooves 7. The part of the active slurry layer 3 located in the grooves 7 abuts against the edge 5 of the through holes 6, that is, the edge 5 of the through holes 6 is clamped by the active slurry layer 3 on both sides of the through holes 6. In this example, the edge 5 of the through hole 6 is bent downward. An adhesive is provided between the first current collector 1 and the second current collector 2. The edge 5 of the through hole 6 bends toward the groove 7. The adhesive is located between the first current collector 1 and the second current collector 2 to form an adhesive layer 4. The adhesive layer 4 has a plurality of them arranged in sequence, and there is a gap between adjacent adhesive layers 4. In this example, the width of the adhesive layer is 1 - 2 mm.

[0039] The components of the active slurry layer 3 include graphene oxide, porous graphene, carbon nanotubes, a binder, conductive carbon black, and activated carbon. In this example, the mass percentages of porous graphene, graphene oxide, and carbon nanotubes are 70%: 20%: 10%. The percentage of conductive carbon black in the slurry mass is 5%. The activated carbon accounts for 5% of the slurry mass. The binder is sodium carboxymethyl cellulose, polytetrafluoroethylene, styrene-butadiene latex, or aqueous polyacrylic acid latex. The above components are stirred and mixed. The stirring speed is 300 rpm / min, the stirring temperature is 60 °C, and the stirring time is 1 h.

[0040] In addition, this embodiment also discloses a method for preparing a supercapacitor electrode plate, which includes the following steps:

[0041] Step 1, preparing the first current collector 1 and the second current collector 2: Take the first current collector 1 and the second current collector 2, and use an automatic laser micropore machine (an automatic laser micropore machine is a special punching device designed using laser technology and numerical control technology) to punch grooves 7 in the first current collector 1 and through holes 6 in the second current collector 2; in this embodiment, the depth of the groove 7 is 0.03 mm, the diameter of the groove 7 is 0.5 cm, and the diameter of the through hole 6 is 0.3 cm. A plurality of grooves 7 are arranged in a matrix in sequence on the first current collector 1, and the spacing between adjacent grooves 7 is 1 cm. A plurality of adjacent through holes 6 are arranged in a matrix in sequence on the second current collector 2. Of course, for the diameter of the groove and the through hole, and the spacing of the grooves, other parameter settings can be made according to the actual situation.

[0042] Step 2, mold loading: sequentially load the first current collector 1, the separator 11, and the second current collector 2 into the mold 12. As shown in Figure 5 In this embodiment, the mold 12 is a square frame. The interior of the mold 12 is provided with a chamber 13 for holding the first current collector 1, the separator 11, and the second current collector 2. A plurality of horizontally arranged support piece channels 14 are provided on one side of the mold 12. As shown in Figure 4 The separator 11 is in the shape of a comb. A plurality of sequentially arranged support pieces 8 are integrally formed on the separator 11. There is a gap between adjacent support pieces 8. Glue cavities 9 are provided at the ends of the support pieces 8. A plurality of liquid outlet holes 10 communicating with the glue cavities 9 and arranged in sequence along the width direction of the support pieces 8 are provided at the bottoms of the support pieces 8. The shape of the liquid outlet holes 10 is a rectangular hole. The length of the liquid outlet holes 10 is 1 - 2 mm, and the width is 0.3 mm. The separator 11 is a metal sheet, specifically an iron sheet. The thickness of the separator 11 in this embodiment is 0.5 mm. The depth of the glue cavity 9 is 0.3 mm, and the length and width are 0.8 cm and 0.3 cm respectively. The depth of the liquid outlet holes 10 is 0.2 mm. The glue cavities 9 and the liquid outlet holes 10 are both formed by laser drilling.

[0043] Place the first current collector 1 in the chamber 13 of the mold 12, and then put the support pieces 8 on the separator 11 into the chamber 13 of the mold 12 through the support piece channels 14 on the mold 12. The support pieces 8 of the separator 11 are located above the first current collector 1. Dip a brush in the adhesive, and the adhesive is a conductive adhesive. Dot the adhesive into the glue cavity 9 until the entire glue cavity 9 is filled. Then put the second current collector 2 into the chamber 13 of the mold 12. The second current collector 2 is located above the support pieces 8 of the separator 11. When the first current collector 1, the separator 11, and the second current collector 2 are placed in the chamber 13 of the mold 12, as shown in Figure 2 and Figure 3As shown, the first current collector 1, the support piece 8 of the separator 11, and the second current collector 2 are distributed in sequence from bottom to top. The groove 7 on the first current collector 1 is opposite to the through hole 6 on the second current collector 2, and the groove 7 of the first current collector 1 in the mold 12 is located at the gap between the two support pieces 8.

[0044] Step 3, filling: Coat the active slurry onto the upper surface of the second current collector 2 in the direction from the end of the support piece 8 provided with the glue liquid cavity 9 to the other end. When the active slurry is coated to the through hole 6 of the second current collector 2, the active slurry enters the groove 7 on the first current collector 1 through the through hole 6 on the second current collector 2; at the same time, when the active slurry is coated to the through hole 6, increase the downward pressing force on the coating tool, so that the edge 5 of the through hole 6 is bent downward under pressure. When coating the active slurry, the support piece 8 is located between the first current collector 1 and the second current collector 2, and the support piece 8 supports the second current collector 2, so that there is a gap between the first current collector 1 and the second current collector 2, and the edge 5 of the through hole 6 will not be located in the groove 7 to block the groove 7, and the active slurry can flow downward through the through hole 6 into the groove 7, avoiding the first current collector 1 and the second current collector 2 being closely attached so that the active slurry is not easily passed through the through hole 6 into the groove 7.

[0045] In this step, while coating the active slurry, the separator 11 is withdrawn from between the first current collector 1 and the second current collector 2 in the direction from the end of the support piece 8 provided with the glue liquid cavity 9 to the other end (the direction in which the separator 11 is withdrawn from the mold 12 is the same as the direction of coating the active slurry). After the active slurry is coated, the support piece 8 is immediately withdrawn from the corresponding coated part, and the support piece 8 no longer supports the part of the second current collector 2 coated with the active slurry, and the second current collector 2 and the first current collector 1 are bonded together by the adhesive. After the active slurry is completely coated on the entire second current collector 2, the entire separator 11 has been completely withdrawn from the mold 12, and the first current collector 1 and the second current collector 2 are all bonded together, and pressure is applied from top to bottom to firmly bond the active slurry, the second current collector 2 and the first current collector 1 together.

[0046] Step 4, drying and demolding: Put the mold 12 in step 3 and the first current collector 1, the second current collector 2 and the active slurry located in the mold 12 into a drying oven for drying. The drying time is 3h and the drying temperature is 60°C; after the drying process, the active slurry dries and becomes the active slurry layer 3;

[0047] After drying, take out the mold 12 and the first current collector 1, the second current collector 2 and the active slurry layer 3 located in the mold 12 from the drying oven and demold them. The first current collector 1, the second current collector 2 and the active slurry layer 3 after demolding are connected together to form a supercapacitor electrode plate. In actual use, it can be cut into the size of electrode packaging according to actual conditions.

[0048] Example 2

[0049] Combined Figure 2 and Figure 3 As shown, in this embodiment, the inner wall ([ Figure 3 the inclined inner wall 15 in [ of the liquid outlet hole 10 near the groove 7 and close to the inner wall of the groove 7 is inclined. The bottom of the inclined inner wall 15 is close to the groove 7, and the top of the inclined inner wall 15 is far from the groove 7.

[0050] The active paste layer 3 can be located on the second current collector 2 because the edge 5 of the through hole 6 is connected to the active paste layer 3. Therefore, the force borne by the edge 5 of the through hole 6 is relatively large, and the load on the edge 5 of the through hole 6 is large. Therefore, a certain amount of adhesive needs to be applied around the groove 7 of the first current collector 1 and the second current collector 2 to prevent the first current collector 1 and the second current collector 2 from separating due to the large force on the edge 5 of the through hole 6. The wall of the conventional liquid outlet hole 10 has a certain wall thickness, and the existence of the wall thickness will occupy the space around the groove 7, thus affecting the application of the adhesive around the groove 7. To solve this problem, in this solution, the inner wall of the liquid outlet hole 10 near the groove 7 and close to the groove 7 is set to be inclined, and the bottom of the inclined inner wall 15 is close to the groove 7, so as to reduce the influence of the wall thickness at the bottom of the liquid outlet hole 10 and reduce the space occupied by the bottom of the inclined inner wall 15 of the liquid outlet hole 10, so that the adhesive can be applied to the groove 7, and the first current collector 1 and the second current collector 2 are bonded with the adhesive at the groove 7, which is beneficial to improving the connection firmness between the first current collector 1 and the second current collector 2. At the same time, the top of the inclined inner wall 15 is far from the groove 7, so that the top of the inclined inner wall 15 has a certain thickness and can support the second current collector 2 to a certain extent.

[0051] The above are only the embodiments of the present invention, and common general technical knowledge such as specific technical solutions and / or characteristics in the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners and the like described in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a supercapacitor electrode plate, characterized in that: It includes the following steps: Step 1, preparing the first current collector and the second current collector: Take the first current collector and the second current collector, and use laser drilling to make grooves on the first current collector and through holes on the second current collector; Step 2, mold loading: Sequentially load the first current collector, the separator, and the second current collector into the mold, and the grooves on the first current collector are opposite to the through holes on the second current collector; The separator includes multiple support pieces, and there are gaps between adjacent support pieces. The grooves of the first current collector in the mold are located at the gaps between two support pieces, and the width of the grooves is equal to the width of the gaps between adjacent support pieces; There are glue cavities provided at the ends of the support pieces, and liquid outlet holes communicating with the glue cavities are provided at the bottoms of the support pieces; Step 3, filling: Coat the active slurry on the surface of the second current collector in the direction from the end of the support piece with the glue cavity to the other end. The active slurry enters the grooves on the first current collector through the through holes on the second current collector; While coating the active slurry, pull out the separator from between the first current collector and the second current collector in the direction from the end of the support piece with the glue cavity to the other end; Step 4, drying and demolding: Put the mold in step 3 and the first current collector, the second current collector, and the active slurry located in the mold into a drying oven for drying. The drying time is 3 h, and the drying temperature is 60 °C; After the drying process, the active slurry dries and becomes an active slurry layer; After drying, take out the mold and the first current collector, the second current collector, and the active slurry layer located in the mold from the drying oven and perform demolding. The demolded first current collector, second current collector, and active slurry layer are connected together to form a supercapacitor electrode plate.

2. The preparation method of a supercapacitor electrode plate according to claim 1, characterized in that: There are multiple liquid outlet holes on each support piece and they are arranged along the width direction of the support piece.

3. The preparation method of a supercapacitor electrode plate according to claim 2, characterized in that: The inner wall of the liquid outlet hole close to the groove is inclined, the bottom of the inclined inner wall is close to the groove, and the top of the inclined inner wall is far from the groove.

4. The preparation method of a supercapacitor electrode plate according to claim 3, characterized in that: In step 3, when the active slurry is coated to the through hole, increase the downward pressing force.

5. A method for preparing a supercapacitor electrode plate according to claim 1, characterized in that: There are multiple support piece channels provided on the side wall of the mold, and the support piece channels communicate with the chamber of the mold.

6. The preparation method of a supercapacitor electrode plate according to claim 1, characterized in that: The separator is a metal sheet.

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