JP4695371B2 - Electrode plate manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to an electrode plate manufacturing apparatus and a manufacturing method.

  In general, an electrode plate such as a nonaqueous electrolyte secondary battery or a double layer capacitor has a configuration in which an active material layer is intermittently provided in a predetermined pattern on at least one surface of a current collector. The non-coated portion where the active material layer pattern does not exist is a portion where the current collector is exposed for the purpose of attaching a terminal or the like.

  The electrode plate prepares a current collector, prepares a coating composition for the active material layer, forms an active material layer by applying the coating composition for the active material layer to the current collector, and dries (Coating process) If necessary, the current collector on which the active material layer is formed is pressed (pressing process), the pressed current collector is cut into a predetermined width (slit process), and an electrode plate Is cut into a predetermined length as necessary (cutting step).

  In the above-described coating process, a intermittent coating method is widely used in which a coated portion to which the active material layer coating composition is applied and a non-coated portion that has not been coated are sequentially formed. In general, intermittent coating is performed by a method such as comma reverse or die coating.

  In particular, the intermittent coating in the die coat is generally performed by the pump 202, the die 203, the main line 204, the intermittent coating valve 205, and the pump 202 of the main line 204 as schematically shown in FIG. The active material layer coating composition is fixed from the pump 202 to the intermittent coating valve 205 using a die coater 201 comprising a section from the valve 205 to the valve 205, a circulation means 207 having a return line 206, and the like. The active material layer coating composition is transferred to the die 203 or the return line 206 by opening and closing the intermittent coating valve 205 continuously at a speed, and the active material layer coating is applied onto the current collector. The coating composition is applied or not applied.

  Specifically, the pump 202 continuously feeds a predetermined amount of the active material layer coating composition to the intermittent coating valve 205 at a constant speed, and the intermittent coating valve 205 forms the active material layer 208. When performing coating to provide the coated portion 209, the intermittent coating valve 205 is opened, and the coating composition is sent to the die 203, and the coating composition is in the die 203. The coating composition is applied to the current collector 210 by being supplied to a paint reservoir called a pocket and extruded from there to a wide slit provided at the tip of the die. When the die 203 passes through the portion of the current collector 210 that becomes the non-coated portion 211, the intermittent coating valve 205 is closed, and the active material layer sent to the intermittent coating valve 205 is closed. The coating composition is transferred to the circulation means 207 through the return line 206. In this way, the coating part 209 and the non-coating part 211 are alternately formed on the current collector 210.

  When performing intermittent coating on the current collector using an apparatus as shown in FIG. 6, if the pump is repeatedly stopped and started each time the main line is switched, vibrations caused by the stop and start of the machine Significant variation occurs in the discharge amount and the coating amount. Therefore, from the viewpoint of the stability of the discharge amount and the coating amount, the pump is continuously operated, but the pump 202 has a pulsation which is a weak continuous vibration generated by operating the machine, and this pulsation is Variations in the coating amount of the active material layer coating composition in the longitudinal direction of the active material layer (that is, the coating amount is not constant, coating unevenness) are directly generated.

  In addition, although there is a slight influence compared to the pulsation of the pump, the pressure fluctuation when switching the flow path by the intermittent coating valve 205, that is, the active material layer coating composition discharged from the pump is intermittently applied. The longitudinal direction of the active material layer also depends on the pressure difference between the pressure sent from the working valve 205 to the return line 206 and the pressure when the active material layer coating composition is sent from the intermittent coating valve 205 to the die 203. In other words, variation in the coating amount of the coating composition for the active material layer (hereinafter sometimes simply referred to as variation in coating amount) occurs.

  Since the pressure fluctuation at the time of switching the flow path of the valve is generally different in the shape of the pipe connected to the intermittent coating valve, the pressure at which the coating composition for the active material layer flows into the return line This is caused by the different pressures at which the composition is transferred to the die.

  If variations occur in the coating amount for each pattern or pattern group of the intermittently coated active material layer due to the pulsation and pressure fluctuation as described above, the performance and safety of the electrode plate are adversely affected. If there is a large variation in the coating amount in the active material layer, when the active material layer is applied to both sides of the current collector, the coating amount balance between the active material layers facing each other across the current collector is partially The battery capacity will vary. In some cases, a metal such as lithium is deposited, causing a defect. Furthermore, if the coating amount variation in the active material layer is large, the active material layer is not uniformly rolled in the pressing step, and an increase in condition loss (loss that is thrown away in the trial process of condition) increases or It becomes a cause in the production stage such as breakage of the press roll.

  Conventionally, in order to suppress the pulsation of the pump, a pump having a relatively small pulsation such as a gear pump has been used to solve the above problem. However, since the gear pump has a structure in which metal gears are directly meshed with each other, contamination due to mixing of the metal powder into the active material layer coating composition is likely to occur. Further, the structure is complicated and the burden of maintenance is large, and further, failure due to gear biting frequently occurs depending on the type of the active material layer coating composition.

  As an alternative pump, a MONO pump, which is a rotary volume type uniaxial eccentric screw pump, is used. The MONO pump does not cause gear engagement and is easy to maintain. However, because of structural wear of the screw and pulsation larger than that of the gear pump, the coating amount tends to increase.

  The present invention has been achieved in view of the above-described actual situation, and the purpose thereof is to apply the coating amount for each pattern or pattern group of the active material layer in intermittent coating by a coating machine such as a die coater. An object of the present invention is to provide an electrode plate manufacturing apparatus and a manufacturing method in which variations are less likely to occur.

The electrode plate manufacturing apparatus provided by the present invention comprises a coating means for coating the active material layer coating composition on a current collector, and an electrode plate manufacturing apparatus comprising a transport means for transporting the current collector. Because
The coating means includes at least a supply source for the active material layer coating composition, a coating head for applying the active material layer coating composition to a current collector, and the active material from the supply source to the coating head. A main line serving as a transfer path for the material layer coating composition, a flow path switching means provided in the middle of the main line, and an active material layer connected to the flow path switching means and from a supply source through the main line Comprising a reciprocating pump for sucking the coating composition for discharging and discharging the coating composition for the active material layer to the coating head,
The flow path switching means includes a connection part interposed in the middle of the main line and constituting a part of the transfer path of the main line, and an inflow side on-off valve for connecting the inlet of the connection part to the supply source side of the main line And an outflow side on-off valve for connecting the outlet side of the connection part to the die side of the main line,
The reciprocating pump is connected to the connecting portion;
At the time of suction of the reciprocating pump, the outflow side on-off valve is closed , the flow in the main line from the reciprocating pump to the coating head is shut off, and the inflow side on-off valve is opened, and the supply source to the reciprocating pump The flow in the main line of
At the time of discharge of the reciprocating pump, the inflow side on-off valve is closed , the flow in the main line from the supply source to the reciprocating pump is shut off, and the outflow side on-off valve is opened, and the reciprocating pump is transferred to the coating head. The flow in the main line is released.

  The reciprocating pump is preferably a syringe pump.

The reciprocating pump may be configured to suck a predetermined amount of the active material layer coating composition and discharge the entire amount of the sucked active material layer coating composition in one discharge operation.
The reciprocating pump may be configured to discharge the predetermined amount each time by dividing the coating composition for the active material layer sucked into the pump into two or more times.

Next, in the method for producing an electrode plate provided by the present invention, the coating process for coating the active material layer coating composition on the current collector along the flow direction of the transport while transporting the current collector. A method of manufacturing an electrode plate comprising:
In the coating step, a transfer path of the active material layer coating composition from a supply source of the active material layer coating composition to a coating head for applying the active material layer coating composition to a current collector On the main line, a connection part constituting a part of the transfer path of the main line, an inflow side on-off valve provided on the inlet side of the connection part, and an outflow provided on the outlet side of the connection part A flow path switching unit including a side opening / closing valve and a reciprocating pump connected to the flow path switching unit, and using the flow path switching unit,
Connecting the inflow side on-off valve of the switching unit to the supply source side of the main line, connecting the outflow side on-off valve to the die side of the main line,
The reciprocating pump performs suction with the outflow side on-off valve closed and the inflow side on-off valve open, and discharge with the outflow side on-off valve opened and the inflow side on-off valve closed. It is characterized by performing .

  The manufacturing method preferably uses a syringe pump as the reciprocating pump.

  The manufacturing method includes a mode in which a predetermined amount of the active material layer coating composition is sucked by the reciprocating pump, and the sucked whole amount of the active material layer coating composition is discharged in one discharge operation. can do.

  The said manufacturing method can be made into the form which divides the coating composition for active material layers suck | inhaled in the pump into two or more times, and discharges the predetermined amount of each time with the said reciprocating pump.

  The manufacturing method may be configured such that two or more reciprocating pumps are provided in parallel on one main line.

In the production apparatus and / or production method of the present invention, a reciprocating pump is interposed in the middle of the main line that is a transfer path from the supply source of the coating composition for the active material layer to the coating head.
A reciprocating pump is a device in which a linear reciprocating element such as a piston performs linear reciprocating motion inside a cylindrical member such as a cylinder to suck and discharge fluid, and quantitatively sucks and discharges fluid. It is possible to control the discharge amount for one time accurately.

  When the reciprocating pump is sucked, the flow from the reciprocating pump to the coating head is interrupted and the flow from the supply source to the reciprocating pump is selectively released. Since the flow from the supply source to the reciprocating pump is cut off and the flow from the reciprocating pump to the coating head is selectively released, the influence of the pulsation or pressure fluctuation by the pump is suppressed and the discharge is made from the coating head. be able to.

  Therefore, according to the present invention, when performing intermittent coating with a coating machine such as a die coater, the active material layer coating composition for one pattern or one pattern group of the active material layer is accurately obtained by a reciprocating pump. Dispersion of coating amount for each pattern or pattern group of the active material layer is very small by discharging the separated composition from the coating head while suppressing the influence of pulsation or pressure fluctuation caused by the pump An electrode plate can be manufactured.

The electrode plate manufacturing apparatus provided by the present invention includes at least coating means for coating the active material layer coating composition on a current collector, and transport means for transporting the current collector, First, continuous intermittent coating is performed along the longitudinal direction of the long electrode plate.
The coating means is at least
(1) Supply source of coating composition for active material layer,
(2) A coating head for applying the active material layer coating composition to a current collector,
(3) a main line serving as a transfer path for the coating composition for the active material layer from the supply source to the coating head;
(4) Channel switching means provided in the middle of the main line, and
(5) From a reciprocating pump connected to the flow path switching means, which sucks the active material layer coating composition from the supply source through the main line and discharges the active material layer coating composition to the coating head. Composed.

  With the above configuration, at the time of suction of the reciprocating pump, the flow in the main line from the reciprocating pump to the coating head is blocked by the flow path switching unit, and the flow in the main line from the supply source to the reciprocating pump is On the other hand, at the time of discharge of the reciprocating pump, the flow in the main line from the supply source to the reciprocating pump is blocked by the flow path switching means, and the flow in the main line from the reciprocating pump to the coating head is released. It is characterized by that.

  In addition, the method for producing an electrode plate provided by the present invention includes a coating process in which the active material layer coating composition is applied on the current collector along the flow direction of the transport while the current collector is transported. In the coating step, the active material layer coating from the supply source of the active material layer coating composition to the coating head for applying the active material layer coating composition to the current collector A reciprocating pump is provided on the main line serving as a transfer path for the composition, and the flow of the main line is closed at the position where the reciprocating pump is provided on the main line or at a position closer to the coating head than that. The suction is performed and the reciprocating pump is discharged by closing the flow of the main line at the position where the reciprocating pump is provided on the main line or at a position closer to the supply source than that. .

  The manufacturing method according to the present invention is mainly a method suitably implemented using the electrode plate manufacturing apparatus according to the present invention. However, the manufacturing method according to the present invention is based on the above procedure. It is not limited only to the method using an apparatus.

In the production apparatus and / or production method of the present invention, transfer of the active material layer coating composition from the composition supply source such as the active material layer coating composition tank to the coating head such as the die head. A reciprocating pump is interposed in the middle of the main line.
In a reciprocating pump, a linear reciprocating element such as a piston is loaded on a cylindrical member such as a cylinder, and the moving element linearly reciprocates inside the cylindrical member to suck and discharge fluid. For example, what is called a syringe pump or a piston pump corresponds to this. Such a reciprocating pump is suitable for quantitatively sucking and discharging fluid, and can accurately control the discharge amount for one time.

When the reciprocating pump is sucked, the flow from the reciprocating pump to the coating head is cut off and the flow from the supply source to the reciprocating pump is selectively released. Is blocked without reaching the coating head.
In addition, when discharging the reciprocating pump, the flow from the supply source to the reciprocating pump is cut off and the flow from the reciprocating pump to the coating head is selectively released. The object is discharged from the coating head by the action of a linear forward movement of a reciprocating motion such as a piston.

Therefore, according to the present invention, when performing intermittent coating with a coating machine such as a die coater, the active material layer coating composition for one pattern or one pattern group of the active material layer is accurately obtained by a reciprocating pump. Dispersion of coating amount for each pattern or pattern group of the active material layer is very small by discharging the separated composition from the coating head while suppressing the influence of pulsation or pressure fluctuation caused by the pump An electrode plate can be manufactured.
Here, one pattern of the active material layer means individual patterns separated by the non-coated portion. Further, one pattern group of the active material layer means a group of two or more patterns included in a certain pattern period when continuous intermittent coating is performed.

  A specific configuration example of the present invention will be described below. In FIG. 1, schematic structure of one Embodiment (101) of the electrode plate manufacturing apparatus which concerns on this invention is shown. The apparatus 101 includes the die coater 1 as a coating unit and also includes a transport unit (not shown) that transports the current collector A to the position of the die. The apparatus 101 may further include other parts such as a drying unit as necessary.

  The die coater 1 includes at least a die 2 that is a coating head, a tank 3 that is a supply source of the coating composition for the active material layer, and a main line that serves as a transfer path for the coating composition for the active material layer from the tank to the die. 4 (4a, 4b, 4c, 4d), a flow path switching valve 5 which is a flow path switching means provided in the middle of the main line, and a syringe pump 6 which is a reciprocating pump connected to the flow path switching valve. It is configured.

  The syringe pump 6 includes at least a syringe 7, a plunger 8, a syringe side line 9 that is a transfer path that connects a space in the syringe to the flow path switching valve, a cam 10 that reciprocates the plunger, a cam shaft 11, and a cam It is comprised from the motor (motor for advancing / retreating) 12 which rotates an axis | shaft.

  In order to assist the transfer of the coating composition for the active material layer, a pump (auxiliary pump) 13 may be provided in the section from the main line tank to the flow path switching valve as necessary. This auxiliary pump may not be a reciprocating pump. Further, a circulation means may be provided for returning the active material layer coating composition to the tank 3 when the auxiliary pump causes excessive transfer. The circulation means in this example includes a main line (4a, 4b) from the tank 3 through the auxiliary pump 13 to the circulation switching valve 14, a return line 15 from the circulation switching valve to the tank, the tank 3, and the auxiliary pump 13 And a switching valve 14 for circulation.

  Using the apparatus 101, while carrying the current collector A to the position of the die, performing continuous intermittent coating on the current collector along the flow direction of the active material layer coating composition, The active material layer B can be formed in a predetermined intermittent pattern.

  At the time of suction of the syringe pump 6, the flow in the main line toward the die is blocked at the position of the flow path switching valve 5 provided at the branch point to the syringe pump 6 on the main line 4, and the syringe from the tank 3 A predetermined amount of the coating composition for the active material layer is sucked into the syringe 7 in a state where the flow in the main line toward the pump 6 is released and the suction impact is not transmitted to the die 2. At this time, the discharge from the die 2 is stopped, and at this time, the current collector passing through the position of the die becomes an uncoated portion.

On the other hand, when the syringe pump 6 is discharged, the flow in the main line from the tank 3 toward the syringe pump 6 is blocked at the position of the flow path switching valve 5 and the flow in the main line toward the die 2 is released. The discharge from the die 2 is performed by the action of the linear forward movement of the plunger 8.
The driving of the flow path switching valve 5 is controlled by control means (not shown) in accordance with the positions of the coated part and the uncoated part of the current collector conveyed to the die position. Switching takes place.

  As in this example, a reciprocating pump is provided on the main line serving as a transfer path for the coating composition for the active material layer, and the reciprocating pump is provided on the main line or a position closer to the coating head than that. In other words, in FIG. 1, the flow of the main line is closed at the position of the flow path switching valve 5 or the main line 4 d in the section downstream thereof, the reciprocating pump is sucked, and the reciprocation on the main line is performed. The position where the dynamic pump is provided or a position closer to the supply source than that (in FIG. 1, the position of the flow path switching valve 5 or the main lines 4a, 4b and 4c in the upstream section. However, it is preferable. Is 4c which is the position of the flow path switching valve 5 or a section in the vicinity thereof)) by closing the flow of the main line and discharging the reciprocating pump. Dynamic and pressure changes can be made very small.

  FIG. 2 schematically shows the discharge and suction operations by the die coater 1 of FIG. At the stage of discharging the active material layer coating composition from the die 2 of the die coater 1, as shown in FIG. 2A, the main lines 4 a to 4 c heading from the tank 3 to the syringe pump 6 by the flow path switching valve 5 and the syringe side The plunger 8 moves forward in a state where the flow of the line 9 is interrupted, and the coating composition for the active material layer is discharged from the die 2, and eventually the plunger 8 reaches the deepest part as shown in FIG. 2B. Discharge is completed. In the discharge stage shown in FIG. 2A and FIG. 2B, the active material layer coating composition does not exist in the sections 4a to 4c from the tank 3 to the flow path switching valve 5 in the main line. The coating composition may stay.

  Next, as shown in FIG. 2C, the plunger 8 is slightly retracted with the flow path switching valve 5 blocking the tank 3 and the syringe pump 6, and the main line flow path switching valve 5 and The active material layer coating composition remaining in the section between the dies 2 is pulled back to the section of the syringe-side line 9. This pulling back step (suckback) is performed to make the suction amount and discharge amount by the syringe pump accurate, but this step is not necessarily required.

  Next, as shown in FIG. 2D, the flow path switching valve 5 is driven to block the flow in the main line 4d toward the die 2, and in this state, the plunger 8 is moved backward to move the syringe pump from the tank 3. A predetermined amount of the active material layer coating composition is sucked into the syringe 7. Thereafter, the flow path switching valve 5 is driven again to obtain the state shown in FIG.

  In the present invention, the active material layer coating composition for a single predetermined discharge is sucked into the syringe 7 by a single suction of the syringe pump 6, and the entire amount sucked is a single discharge operation. By discharging, the coating amount for one pattern can be accurately divided in each suction operation and discharged from the die.

  In the present invention, the active material layer coating composition for one pattern group determined in advance is sucked into the syringe 7 by one suction of the syringe pump 6, and how many times the sucked composition is sucked. By dispensing the same predetermined amount or a specific predetermined amount for each time, the coating amount for one pattern group is accurately divided in each suction operation, and the accurate predetermined amount for each time is discharged from the die. be able to. In this case, it is preferable to provide a mechanism other than the cam as a mechanism for moving the plunger forward and backward in order to accurately temporarily stop the plunger at several positions.

FIG. 5 schematically shows an overall configuration example (apparatus 104) of an electrode plate manufacturing apparatus including a die coater similar to that shown in FIG.
The apparatus 104 includes a transport unit 21 that transports the current collector A, the die coater 1 illustrated in FIG. 1, a drying unit 22, an input unit 23, and a control unit 24.

  The conveying means 21 is means for supplying and winding the current collector A for various processes. In the example of FIG. 5, the supply unit 26 to which the electrode plate supply roll 25 is attached, the motor 29 a that drives the supply unit, the winding unit 28 to which the electrode plate winding roll 27 is attached, and the winding unit are driven. The motor 29b, the guide roller 30 that supports the current collector A that moves on the transport path, and other members, if necessary, constitute transport means. The conveyance speed is usually 5 to 50 m / min. And

  The die coater 1 is basically the same as that shown in FIG. 1, but does not have a circulation means including an auxiliary pump. Further, a flow path switching motor 29c for driving the flow path switching valve 5 is provided.

  The current collector A on which the active material layer B is formed by the die coater 1 is transported by a transport means and is usually dried by a drying means 22, and as a heat source in the drying process, hot air, infrared rays, microwaves, high frequency Or a combination thereof. You may dry with the heat which discharge | released the metal roller and metal sheet which support or press a collector in a drying process. Moreover, an active material layer can also be obtained by carrying out the crosslinking reaction of a binder by irradiating an electron beam or a radiation after drying. Application and drying may be repeated a plurality of times.

  The input means 23 is a means for inputting an instruction such as start, stop, or operating condition necessary for operating the device 104 to convert it into a signal (creating an instruction signal) and transmitting the instruction signal to the control means. The instruction signal includes conditions such as timing and speed of suction / discharge by the syringe pump 6. The input means includes, for example, an interface unit for inputting an instruction, a conversion unit that converts the input information into a signal, and a transmission unit that sends the generated instruction signal to the control unit. For this purpose, other members such as a program recording unit for accumulating signals and transmitting a part of the accumulated signals at an appropriate time may be included.

  The control means 24 is means for controlling the operation process. The control means includes, for example, a program section for accumulating a control program, a calculation section for checking the suitability of the operating conditions or determining the optimum conditions by collating the instruction signal from the input means and feedback information from various sensors with the control program, It is comprised from the transmission part which sends a signal to each drive means, and another member as needed. In the example of FIG. 5, the control means is the input means 23, other sensors not shown, the plunger forward / backward motor 12, the flow path switching motor 29 c, the motor 29 a for driving the supply unit, the winding Comprehensive judgment of instruction signals received from the input means, control programs recorded in advance in the control means, and feedback information from various sensors. Then, the entire process is controlled from the start to the stop of operation.

  Furthermore, the density of the active material layer, the adhesion to the current collector, and the homogeneity can be improved by pressing the obtained active material layer. The pressing process may be performed by providing a pressing means (not shown) on the downstream side of the drying means 22, or the intermediate product of the electrode plate that has passed through the drying means is taken up on the take-up roll 27 and taken up. Alternatively, the roll may be set in a press device different from the device 104.

  The press working is performed using, for example, a metal roll, an elastic roll, a heating roll, a sheet press machine, or the like. In the present invention, the pressing temperature may be performed at room temperature or may be performed as long as the temperature is lower than the temperature for drying the coating film of the active material layer. As a guide, it is 15 to 35 ° C.).

The active material layer thus obtained contains at least a positive electrode or negative electrode active material and a binder, and further contains a conductive agent and other components as necessary. The active material after drying The blending ratio of each component contained in the layer is the same as the blending ratio on the basis of the solid content of the active material layer coating composition. The coating amount of the positive electrode or negative electrode active material layer is usually 20 to 350 g / m ² , and the thickness thereof is usually 10 to 200 μm, preferably 50 to 170 μm after drying and pressing.

FIG. 3 shows a schematic configuration of an embodiment (102) different from FIG. The apparatus 102 includes the die coater 1 as a coating unit and also includes a transport unit (not shown) that transports the current collector A to the position of the die.
The die coater 1 includes at least a die 2 that is a coating head, a tank 3 that is a supply source of the coating composition for the active material layer, and a main line that serves as a transfer path for the coating composition for the active material layer from the tank to the die. 4 (4a, 4d), a flow path switching unit 16 which is a flow path switching means provided in the middle of the main line, and a syringe pump 6 which is a reciprocating pump connected to the flow path switching unit 16. Yes.

The flow path switching unit 16 is interposed in the middle of the main line and connects the connection part 17 constituting a part of the transfer path of the main line and the inlet of the connection part to the section 4a on the supply source side of the main line. An inflow side on-off valve 18 and an outflow side on-off valve 19 for connecting the outlet side of the connecting portion to the section 4d on the die side of the main line are provided.
The syringe pump 6 is connected to the connecting portion 17. In particular, in this example, the flow path switching unit 16 and the syringe pump 6 are integrated.
The syringe pump 6 includes at least a syringe 7, a plunger 8, a forward / backward mechanism 20 for reciprocating the plunger, and a motor (forward / backward motor) 12 for driving the forward / backward mechanism.

In the device 102, when the syringe pump is aspirated, the outflow side on-off valve 19 is closed and the inflow side on-off valve 18 is opened, while when the syringe pump is discharged, the outflow side on-off valve 19 is opened and the inflow side on-off valve is opened. The valve 18 is closed. Accordingly, as with the apparatus 101 of FIG. 1, the pump pulsation and pressure changes transmitted to the die 2 can be very small.
The inflow side on / off valve 18 and the outflow side on / off valve 19 are driven by control means (not shown) according to the positions of the coated and uncoated parts of the current collector conveyed to the die position. The flow path is switched under control.

FIG. 4 shows a schematic configuration of still another embodiment (apparatus 103). The apparatus 103 has two syringe pumps 6a and 6b having the same structure as that shown in FIG. 1, and these are connected in parallel on one main line. The cams 10a and 10b of the two syringe pumps 6a and 6b are fixed on the camshaft 11 with the azimuth angle shifted by 180 degrees, so that the two plungers 8a and 8b are reciprocally shifted in phase by 180 degrees. Is set.
In the present invention, as in this example, two or more reciprocating pumps are provided in parallel on one main line, and an appropriate phase difference is set for the suction / discharge operation of each reciprocating pump as necessary. As a result, it is possible to increase the efficiency of intermittent coating or to form a complicated intermittent pattern.

It is a figure which shows typically schematic structure of one Embodiment of the electrode plate manufacturing apparatus which concerns on this invention. It is the figure which showed typically discharge operation | movement of the die coater shown in FIG. It is the figure which showed typically the discharge completion state of the die coater shown in FIG. It is the figure which showed typically the suck back operation | movement of the die-coater shown in FIG. It is the figure which showed typically the suction operation of the die-coater shown in FIG. It is a figure which shows typically schematic structure of another embodiment of the electrode plate manufacturing apparatus which concerns on this invention. It is a figure which shows typically schematic structure of another embodiment of the electrode plate manufacturing apparatus which concerns on this invention. It is a figure which shows typically the example of a whole structure of the electrode plate manufacturing apparatus containing the die-coater shown in FIG. It is a figure which shows typically the structural example of the conventional die-coater which performs intermittent application | coating.

Explanation of symbols

101, 102, 103, 104: Electrode plate manufacturing apparatus A: Current collector B: Coating layer or active material layer 1: Die coater 2: Die 3: Tank 4 (4a, 4b, 4c, 4d): Main line 5: Flow path switching valve 6 (6a, 6b): Syringe pump 7: Syringe 8 (8a, 8b): Plunger 9: Syringe side line 10 (10a, 10b): Cam 11: Cam shaft 12: Forward / reverse motor DESCRIPTION OF SYMBOLS 13: Auxiliary pump 14: Circulation switching valve 15: Return line 16: Flow path switching unit 17: Connection part 18: Inflow side on-off valve 19: Outflow side on-off valve 20: Forward / backward mechanism 21 Conveying means 22 Drying means 23 Input means 24 control means 25 electrode plate supply roll 26 supply unit 27 electrode plate winding roll 28 winding unit 29a motor 29b winding unit for driving the supply unit 29c Flow path switching motor 29d Drying means motor 30 Guide roller 201 Die coater 202 Pump 203 Die 204 Main line 205 Intermittent coating valve 206 Return line 207 Circulating means 208 Active material layer 209 Coating section 210 Collection Electrical body 211 Non-coated part

Claims (10)

A coating means for coating the active material layer coating composition on a current collector, and an electrode plate manufacturing apparatus comprising a transport means for transporting the current collector,
The coating means includes at least a supply source of the active material layer coating composition, a coating head for applying the active material layer coating composition to a current collector, and the active material from the supply source to the coating head. A main line serving as a transfer path for the coating composition for the material layer, a flow path switching means provided in the middle of the main line, and an active material layer connected to the flow path switching means and from the supply source through the main line Comprising a reciprocating pump for sucking the coating composition for discharging and discharging the coating composition for the active material layer to the coating head,
The flow path switching means includes a connection part interposed in the middle of the main line and constituting a part of the transfer path of the main line, and an inflow side on-off valve for connecting the inlet of the connection part to the supply source side of the main line And an outflow side on-off valve for connecting the outlet side of the connection part to the die side of the main line,
The reciprocating pump is connected to the connecting portion;
At the time of suction of the reciprocating pump, the outflow side on-off valve is closed , the flow in the main line from the reciprocating pump to the coating head is shut off, and the inflow side on-off valve is opened, and the supply source to the reciprocating pump The flow in the main line of
At the time of discharge of the reciprocating pump, the inflow side on-off valve is closed , the flow in the main line from the supply source to the reciprocating pump is shut off, and the outflow side on-off valve is opened, and the reciprocating pump is transferred to the coating head. An apparatus for producing an electrode plate, wherein the flow in the main line is released.   The electrode plate manufacturing apparatus according to claim 1, wherein the reciprocating pump is a syringe pump.   3. The reciprocating pump according to claim 1, wherein the reciprocating pump sucks a predetermined amount of the active material layer coating composition, and discharges the entire amount of the sucked active material layer coating composition in one discharge operation. Electrode plate manufacturing equipment.   The said reciprocating pump is a manufacturing apparatus of the electrode plate of Claim 1 or 2 which divides the coating composition for active material layers suck | inhaled in the pump into 2 times or more, and discharges the predetermined amount of each time. The electrode plate manufacturing apparatus according to any one of claims 1 to 4 , wherein two or more reciprocating pumps are provided in parallel on one main line. An electrode plate manufacturing method comprising a coating step of applying a coating composition for an active material layer on a current collector along a flow direction of conveyance while conveying the current collector,
In the coating step, a transfer path of the active material layer coating composition from a supply source of the active material layer coating composition to a coating head for applying the active material layer coating composition to a current collector On the main line, a connection part constituting a part of the transfer path of the main line, an inflow side on-off valve provided on the inlet side of the connection part, and an outflow provided on the outlet side of the connection part A flow path switching unit including a side opening / closing valve and a reciprocating pump connected to the flow path switching unit, and using the flow path switching unit,
Connecting the inflow side on-off valve of the switching unit to the supply source side of the main line, connecting the outflow side on-off valve to the die side of the main line,
The reciprocating pump performs suction with the outflow side on-off valve closed and the inflow side on-off valve open, and discharge with the outflow side on-off valve opened and the inflow side on-off valve closed. A method for producing an electrode plate, which is performed . The method for manufacturing an electrode plate according to claim 6 , wherein a syringe pump is used as the reciprocating pump. By the reciprocating pump, according to claim 6 or 7 sucks the predetermined amount, and discharges the entire amount of aspirated active material layer coating composition in a single ejection operation of the active material layer coating composition Of manufacturing the electrode plate. The method for producing an electrode plate according to claim 6 or 7 , wherein the coating composition for the active material layer sucked into the pump is divided into two or more times and a predetermined amount is discharged each time by the reciprocating pump. The method for manufacturing an electrode plate according to any one of claims 6 to 9 , wherein two or more reciprocating pumps are provided in parallel on one main line.

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