JP2017103014A - Method of manufacturing electrode plate - Google Patents

Abstract

An electrode plate having an active material layer having a uniform thickness is provided. A method of manufacturing an electrode plate according to the present invention sets a size of a gap between a first roll and a second roll facing each other at a first position to a first set value, A film forming step of forming an active material layer on the second roll by passing the electrode material through the position; Further, the size of the gap between the second roll and the third roll facing each other at the second position is set to the second set value, and the active material layer on the second roll is placed at the second position. And a transfer step of transferring the active material layer onto the current collector foil through the current collector foil. Further, the film forming process is started with the size of the gap between the second roll and the third roll being in a separated state larger than the second set value. And after the front-end | tip of the active material layer on a 2nd roll arrives at a 2nd position, the clearance gap adjustment which makes the magnitude | size of the clearance gap between a 2nd roll and a 3rd roll a 2nd setting value is performed . [Selection] Figure 6

Description

  The present invention relates to a method for manufacturing an electrode plate. More specifically, an electrode plate is manufactured by passing an electrode material between roll pairs and applying pressure to form an active material layer, and transferring the active material layer to the surface of the current collector foil. It is about.

  A battery such as a lithium ion secondary battery is one in which positive and negative electrode plates and an electrolytic solution are accommodated in a case. The positive and negative electrode plates have a current collector foil and an active material layer. The active material layer includes an electrode material such as an active material that contributes to charging and discharging, and a binder for binding the active material on the current collector foil to form an active material layer. And as a prior art which concerns on the manufacturing method of such an electrode plate, the thing of patent document 1 is mentioned, for example.

  In the apparatus according to FIG. 6 of Patent Document 1, first, an electrode material made of an active material, a binder, or the like is supplied to a facing position between the first roll and the second roll, and is passed through a gap at the facing position. To form an active material layer. In addition, the active material layer formed and adhered on the second roll is transferred onto the current collector foil by passing it along with the current collector foil through the gap between the second roll and the third roll. Yes. Thus, an electrode plate having an active material layer on the current collector foil is manufactured.

JP2015-164717A

  However, in the conventional technology as described above, it is difficult to manufacture an electrode plate having a long length in the transport direction while forming an active material layer having a uniform thickness in the transport direction. That is, the electrode material is pressed into an active material layer at a position where the first roll and the second roll face each other. Further, the active material layer on the second roll is transferred onto the current collector foil by being pressed together with the current collector foil in the thickness direction at a position opposite to the second roll and the third roll.

  And when an electrode material passes the opposing position of a 1st roll and a 2nd roll, a 1st roll and a 2nd roll each receive the reaction force which pressurizes an electrode material in the direction away from each other. In addition, when the active material layer and the current collector foil pass through the opposing positions of the second roll and the third roll, the second roll and the third roll have a reaction force that pressurizes the active material layer and the current collector foil, respectively. , Receive in directions away from each other.

  That is, during manufacture of the electrode plate, the gap at the opposing position between the first roll and the second roll and the gap at the opposing position between the second roll and the third roll may change. For this reason, it is because the thickness of the active material layer of the electrode plate manufactured by passing through the gap also changes as the gap changes.

  The present invention has been made for the purpose of solving the problems of the prior art described above. That is, the problem is to provide a method for producing an electrode plate having an active material layer having a uniform thickness.

  The electrode plate manufacturing method of the present invention, which has been made for the purpose of solving this problem, is such that one part of the outer peripheral surface faces each other and the movement direction of the outer peripheral surface at the first position where the outer peripheral surfaces face each other is the same. The first roll and the second roll that rotate in the direction to be, and the second roll and one outer peripheral surface face each other at a second position other than the first position, and the second position Using an electrode plate manufacturing apparatus having a third roll rotating in a direction in which the movement direction of the outer peripheral surface of the second roll is the same as the movement direction of the outer peripheral surface of the second roll, A film forming step of forming an active material layer on the second roll by passing an electrode material containing at least an active material and a binder to a first position where the size of the gap is set to a first set value. And the gap between the second roll and the third roll Pass the active material layer on the second roll with the current collector foil wound around the third roll to the second position where the size is set to the second set value, and collect the active material layer. A method of manufacturing an electrode plate having a transfer step of transferring onto an electric foil to form an electrode plate, wherein a film forming step is performed, and a size of a gap between the second roll and the third roll is set to a second setting Starting from a separated state larger than the value, and after the leading edge of the active material layer formed on the second roll by the started film formation process reaches the second position, the active material layer is moved to the second position. In the existing state, at least one of the second roll and the third roll is moved toward the other, and the gap adjustment between the second roll and the third roll is set to the second set value. It is the manufacturing method of the electrode plate characterized by performing.

  In the method of manufacturing the electrode plate according to the present invention, the size of the gap at the second position can be adjusted by adjusting the gap while the object to be pressed exists at the first position and the second position. For this reason, in this embodiment, the gap at the second position can be adjusted without being affected by the movement accompanying the pressurization of the second roll. Therefore, it is possible to manufacture an electrode plate having an active material layer with a uniform thickness while keeping the size of the gap at the second position constant.

  According to the present invention, a method for manufacturing an electrode plate having an active material layer having a uniform thickness is provided.

It is sectional drawing of the electrode plate which concerns on embodiment. It is a schematic block diagram of the electrode plate manufacturing apparatus which concerns on embodiment. It is a figure which shows the separation state in a clearance gap adjustment. It is a figure which shows the state which cancelled | released the clearance gap state of clearance adjustment. It is a graph which shows transition of the thickness of the active material layer formed on a 2nd roll by a film-forming process. It is a graph which shows transition of the magnitude | size of the clearance gap between the 2nd opposing positions which concern on this form. It is a graph which shows transition of the magnitude | size of the gap | interval of the 2nd opposing position when not performing gap adjustment. It is a figure which shows a modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for embodying the present invention will be described in detail with reference to the drawings.

  First, the electrode plate 100 manufactured in this embodiment will be described with reference to FIG. The electrode plate 100 includes a current collector foil 110 and an active material layer 120 as shown in the cross-sectional view of FIG. The electrode plate 100 is long in the left-right direction in FIG.

  In the electrode plate 100 of this embodiment, the active material layer 120 is formed only on the first surface 111 of the current collector foil 110. The electrode plate 100 is used as a positive electrode or a negative electrode for constituting a secondary battery such as a lithium ion secondary battery, for example. When the electrode plate 100 is used for manufacturing a secondary battery as a positive electrode or a negative electrode, the electrode plate 100 is appropriately cut out to a necessary size.

  For example, a metal foil can be used as the current collector foil 110. The active material layer 120 includes at least the active material 121 and the binder 122. The active material 121 contributes to charging / discharging in the battery. Further, the binder 122 forms the active material layer 120 by binding the materials constituting the active material layer 120 to each other, and binds the active material layer 120 to the first surface 111 of the current collector foil 110. Is for.

Specifically, when the electrode plate 100 is a positive electrode of a lithium ion secondary battery, for example, an aluminum foil is used as the current collector foil 110, LiNi _0.5 Mn _1.5 O ₄ is used as the active material 121, and a binder is used. Polyvinylidene fluoride (PVDF) can be used as 122. Alternatively, when the electrode plate 100 is a negative electrode of a lithium ion secondary battery, for example, a copper foil is used as the current collector foil 110, a carbon material is used as the active material 121, and styrene butadiene rubber (SBR) is used as the binder 122. Can do. Note that the active material layer 120 may further include materials other than the active material 121 and the binder material 122 such as a conductive material for enhancing the conductivity in the active material layer 120 as appropriate.

  Next, an electrode plate manufacturing apparatus used for manufacturing the electrode plate 100 in this embodiment will be described. In FIG. 2, the schematic block diagram of the electrode plate manufacturing apparatus 1 of this form is shown. As shown in FIG. 2, the electrode plate manufacturing apparatus 1 includes a first roll 10, a second roll 20, and a third roll 30. In FIG. 2, the vertical direction is the vertical direction, and gravity is acting downward.

  In the electrode plate manufacturing apparatus 1 of the present embodiment, the first roll 10, the second roll 20, and the third roll 30 are all arranged in a state where the axial direction is horizontal. The first roll 10, the second roll 20, and the third roll 30 are made of a material such as metal, for example. Moreover, the 1st roll 10 and the 2nd roll 20 are arrange | positioned in parallel in the state in which each outer peripheral surface 11 and 21 mutually opposed in the 1st opposing position A. The third roll 30 is disposed in parallel with the second roll 20 with the second roll 20 and the outer peripheral surfaces 21 and 31 facing each other at the second facing position B.

  The first roll 10 and the second roll 20 are held so that the distance between the axes is a constant distance. A gap is provided between the outer peripheral surface 11 of the first roll 10 and the outer peripheral surface 21 of the second roll 20 at the first facing position A. The size of the gap at the first facing position A is indicated by GA. Note that GA shown in FIG. 2 is a set value of the size of the gap at the first facing position A.

  The third roll 30 is held so that the distance between the axes of the third roll 30 and the second roll 20 is a constant distance. A gap is provided between the outer peripheral surface 21 of the second roll 20 and the outer peripheral surface 31 of the third roll 30 at the second facing position B. The size of the gap at the second facing position B is indicated by GB1. Note that GB1 shown in FIG. 2 is also a set value of the size of the gap at the second facing position B.

  In addition, the first roll 10, the second roll 20, and the third roll 30 rotate when the electrode plate 100 is manufactured. In FIG. 2, the rotation directions of the first roll 10, the second roll 20, and the third roll 30 are indicated by arrows, respectively. That is, in FIG. 2, the rotation direction of the first roll 10 and the third roll 30 is clockwise, and the rotation direction of the second roll 20 is counterclockwise.

  The rotation directions of the first roll 10 and the second roll 20 are directions in which the movement directions of the outer peripheral surfaces 11 and 21 at the first facing position A are the same. Specifically, the rotation directions of the first roll 10 and the second roll 20 are directions in which the movement directions of the outer peripheral surfaces 11 and 21 at the first facing position A are downward in the vertical direction. The rotation direction of the third roll 30 is such that the movement direction of the outer peripheral surface 31 at the second facing position B is the same as the movement direction of the outer peripheral surface 21 of the second roll 20. For this reason, the rotation directions of the second roll 20 and the third roll 30 are directions in which the movement directions of the outer peripheral surfaces 21 and 31 at the second facing position B are the same.

  In the present embodiment, the second roll 20 rotates at a peripheral speed faster than the peripheral speed of the first roll 10. Further, the third roll 30 rotates at a peripheral speed faster than the peripheral speed of the second roll 20. That is, the 1st roll 10, the 2nd roll 20, and the 3rd roll 30 rotate so that a peripheral speed may become high in this order.

  The electrode material 130 is supplied to the first facing position A from above. The electrode material 130 is a material for forming the active material layer 120 of the electrode plate 100. Therefore, the electrode material 130 includes at least the active material 121 and the binder 122. The electrode material 130 may be made of a powder component such as the active material 121 and the binder 122. Alternatively, the electrode material 130 may be obtained by adding a solvent to powder components such as the active material 121 and the binder 122. In addition, when the active material layer 120 includes a material other than the active material 121 and the binder 122, the material may be included in the electrode material 130.

  In addition, a partition 90 is provided above the first facing position A. The partition portion 90 is an enclosure for preventing the electrode material 130 from spilling over the first facing position A, that is, from the upper surfaces of the first roll 10 and the second roll 20. The electrode material 130 above the first facing position A is accumulated inside the partition portion 90.

  Further, a current collector foil 110 is wound around the outer peripheral surface 31 of the third roll 30 as shown in FIG. The current collector foil 110 is wound around the second facing position B of the third roll 30 with the second surface 112 side facing the outer peripheral surface 31 of the third roll 30. For this reason, the current collector foil 110 is conveyed by the rotation of the third roll 30.

  Further, the first surface 111 of the current collector foil 110 faces the outer peripheral surface 21 of the second roll 20 at the second facing position B. Note that the third roll 30 rotates at a faster peripheral speed than the second roll 20 as described above. For this reason, the moving speed of the first surface 111 of the current collector foil 110 at the second facing position B is faster than the moving speed of the outer peripheral surface 21 of the second roll 20 at the second facing position B.

  Further, as shown in FIG. 2, the current collector foil 110 is supplied into the electrode plate manufacturing apparatus 1 from the lower right of the third roll 30, passes through the second facing position B, and then toward the upper right of the third roll 30. It is transported to be discharged. When the current collector foil 110 is supplied to the electrode plate manufacturing apparatus 1, nothing is formed yet on the first surface 111 thereof. The electrode plate manufacturing apparatus 1 can manufacture the electrode plate 100 by forming the active material layer 120 on the first surface 111 of the current collector foil 110 at the second facing position B.

  Furthermore, in the electrode plate manufacturing apparatus 1 of the present embodiment, the second roll 20 can move in the left-right direction together with the first roll 10. That is, the second roll 20 can move in a direction away from the third roll 30 or a direction approaching the third roll 30. Thereby, the electrode plate manufacturing apparatus 1 of this form can adjust the magnitude | size of the clearance gap in the 2nd opposing position B. FIG.

  Next, the manufacturing method of the electrode plate 100 of this form using the electrode plate manufacturing apparatus 1 is demonstrated. At the time of manufacturing the electrode plate 100, the electrode material 130 supplied to the inside of the partition portion 90 is sent to the first facing position A by the rotation of the first roll 10 and the second roll 20 in order from the lower one.

  The electrode material 130 that has reached the first facing position A passes through the gap of the size GA by the rotation of the first roll 10 and the second roll 20, and the outer circumferential surface 11 of the first roll 10 and the first roll 10 when passing through the gap. The pressure is applied between the outer peripheral surface 21 of the two rolls 20. By this pressurization, the particles in the electrode material 130 are bound together by the action of the binding material 122 in the electrode material 130. Thereby, the electrode material 130 that has passed through the first facing position A is formed into a sheet-like active material layer 131. In this embodiment, the step of pressurizing the electrode material 130 at the first facing position A to form the active material layer 131 is a film forming step.

  FIG. 3 shows the electrode plate manufacturing apparatus 1 at the start of the film forming process. As shown in FIG. 3, at the start of the film forming process, the first roll 10 and the second roll 20 are moved away from the third roll 30 to be separated from each other. In FIG. 3, the size of the gap at the second facing position B in this separated state is indicated by GB2. Note that GB2 shown in FIG. 3 is also a set value of the size of the gap at the second facing position B. GB2 is larger than GB1.

  Further, the active material layer 131 formed in the film forming process adheres to the surface of the outer peripheral surface 11 of the first roll 10 and the outer peripheral surface 21 of the second roll 20 that has a higher moving speed at the first facing position A. Tend to. As described above, in the electrode plate manufacturing apparatus 1, the second roll 20 has a faster peripheral speed than the first roll 10. That is, in the film forming process, the active material layer 131 formed at the first facing position A adheres to the outer peripheral surface 21 of the second roll 20.

  Therefore, the active material layer 131 formed in the film forming process adheres to the outer peripheral surface 21 of the second roll 20 that has passed through the first facing position A. Further, the active material layer 131 formed in the film forming process is then transported by the rotation of the second roll 20 and reaches the second facing position B.

  FIG. 4 shows a state after the tip of the active material layer 131 formed by the film forming process has reached the second facing position B. As shown in FIG. 4, the first roll 10 and the second roll 20 have moved in a direction approaching the third roll 30 from the separated state shown in FIG. 3. The movement of the first roll 10 and the second roll 20 is performed after the tip of the active material layer 131 reaches the second facing position B. As shown in FIG. 4, the size of the gap at the second facing position B after movement is set to GB1.

  That is, in this embodiment, after the film forming process is started by setting the size of the gap at the second facing position B to GB2, and after the active material layer 131 formed by the film forming process reaches the second facing position B, The gap adjustment is performed so that the size of the gap at the second facing position B is set to GB1. Note that, in the separated state in the gap adjustment, the third roll 30 may be rotating or may be stopped.

  In addition, a current collector foil 110 is passed through the second facing position B as shown in FIG. Therefore, after that, the active material layer 131 that has reached the second facing position B by the rotation of the second roll 20 passes through the gap of the size GB1 together with the current collector foil 110 wound around the third roll 30. To do. During the passage of the gap at the second facing position B, the current collector foil 110 and the active material layer 131 are pressed by the second roll 20 and the third roll 30 in the thickness direction.

  Even at the second facing position B, the pressurized active material layer 131 has a higher moving speed at the second facing position B among the outer peripheral surface 21 of the second roll 20 and the first surface 111 of the current collector foil 110. Tend to adhere to. And as above-mentioned, as for the 3rd roll 30 in the electrode plate manufacturing apparatus 1 of this form, the moving speed of the 1st surface 111 of the current collection foil 110 in the 2nd opposing position B is from the circumferential speed of the 2nd roll 20. Rotating at a faster peripheral speed. Therefore, at the second facing position B, the active material layer 131 is transferred from the outer peripheral surface 21 of the second roll 20 onto the first surface 111 of the current collector foil 110.

  Therefore, as shown in FIG. 2, the active material layer 120 is transferred to the first surface 111 of the current collector foil 110 after passing through the second facing position B. In this embodiment, the process of transferring the active material layer 120 to the current collector foil 110 is a transfer process. In addition, after the gap adjustment, in the electrode plate manufacturing apparatus 1, the first roll 10, the second roll 20, and the third roll 30 are continuously rotated, so that both the film forming process and the transfer process are continuously performed. Will be done. Thereby, the electrode plate 100 with a long length in the conveyance direction of the current collector foil 110 can be manufactured.

  Here, in this embodiment, the electrode plate 100 having the active material layer 120 having a uniform thickness in the conveying direction of the current collector foil 110 can be manufactured by adjusting the gap as described above. This will be described. FIG. 5 is a graph showing the transition of the thickness of the active material layer 131 formed at the first facing position A. FIG. In FIG. 5, the horizontal axis represents time, and the vertical axis represents the thickness of the active material layer 131 on the second roll 20. FIG. 5 shows a start time tS at which the film forming process starts and an end time tE at which the manufacture of the electrode plate 100 ends.

  From the graph of FIG. 5, it can be seen that the active material layer 131 is formed by the film forming process from the start time tS to the end time tE. Note that the thickness of the active material layer 131 is once thickened to T2 after the start time tS of the film forming process, and thereafter changes at T1 which is thinner than T2. That is, as shown in the graph of FIG. 5, the active material layer 131 having a thickness T2 is formed at the initial stage when the electrode material 130 starts to pass through the first facing position A, and then the active material layer 131 having a thickness T1. Is formed until the end time tE of the film forming process.

  Next, FIG. 6 is a graph showing the transition of the size of the gap at the second facing position B according to this embodiment. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the size of the gap at the second facing position B. FIG. 6 also shows the start time tS and end time tE of the film forming process.

  As described above, the gap adjustment is performed in this embodiment. For this reason, as shown in FIG. 6, the size of the gap at the second facing position B is set to GB2 at the start time tS. FIG. 6 shows an arrival time t1 when the active material layer 131 on the second roll 20 formed by the film forming process reaches the second facing position B. Further, FIG. 6 shows an adjustment time t2 when the set value of the gap at the second facing position B is changed from GB2 to GB1 by the gap adjustment. As shown in FIG. 6, the adjustment time t2 is later than the arrival time t1.

  As can be seen from FIG. 6, in the present embodiment, after the adjustment time t2, the size of the gap at the second facing position B is constant at the set value GB1. Thereby, in this embodiment, the electrode plate 100 having the active material layer 120 having a uniform thickness can be manufactured. This is because the size of the gap at the second facing position B during the transfer process is constant at GB1.

  On the other hand, FIG. 7 is a graph showing the transition of the size of the gap at the second facing position B when the film forming process and the transfer process are performed without adjusting the gap. Specifically, FIG. 7 shows a case where the set value of the size of the gap at the second facing position B is constant at GB1.

  As shown in FIG. 7, the size of the gap is GB1 which is a set value before the film formation process start time tS. However, after the start time tS, the size of the gap at the second facing position B is narrowed to GB3 which is smaller than the set value GB1. This is because the electrode material 130 passes through the gap at the first facing position A between the first roll 10 and the second roll 20.

  That is, when the first roll 10 and the second roll 20 pressurize the electrode material 130, they receive a reaction force related to the pressurization. The direction of the reaction force received by the first roll 10 and the second roll 20 when the electrode material 130 is pressurized is a direction away from the other. For this reason, the second roll 20 receives a reaction force in a direction away from the first roll 10 and moves in a direction away from the first roll 10.

  That is, the second roll 20 moves in a direction approaching the third roll 30 when the electrode material 130 is pressurized. Therefore, after the start time tS, the size of the gap between the second roll 20 and the third roll 30 at the second facing position B is such that the second roll 20 moves in a direction approaching the third roll 30. Actually, it is narrowed to GB3 smaller than the set value GB1.

  In addition, the size of the gap at the second facing position B decreases to GB3 and then increases to GB4. This is because the thick active material layer 131 is formed at the initial stage when the electrode material 130 starts to pass through the first facing position A, and the amount of movement of the second roll 20 toward the third roll 30 is large. That's why. Further, this is because the active material layer 131 on the second roll 20 has reached the second facing position B by the rotation of the second roll 20. That is, when the active material layer 131 reaches the second facing position B, the second roll 20 and the third roll 30 pressurize the active material layer 131 together with the current collector foil 110, respectively. For this reason, each of the second roll 20 and the third roll 30 receives a reaction force related to pressurization in a direction away from the other, and moves in a direction away from each other.

  FIG. 7 shows that when the gap adjustment according to the present embodiment is not performed, the size of the gap at the second facing position B is not constant at the set value GB1 but changes. Thus, it can be seen that the electrode plate 100 having the active material layer 120 having a certain thickness cannot be manufactured unless the gap adjustment according to this embodiment is performed. This is because the size of the gap at the second facing position B during the transfer process changes.

  Further, FIG. 7 shows that the active material layer 120 of the electrode plate 100 cannot be formed thin when the gap adjustment according to this embodiment is not performed. As shown in FIG. 7, after the start time tS, the gap at the second facing position B is narrowed from the set value GB1 to GB3. For this reason, the set value of the gap at the second facing position B must be set to be equal to or greater than the difference between GB1 and GB3. When the set value of the gap at the second facing position B is less than the difference between GB1 and GB3, the second roll 20 and the third roll 30 come into contact with each other. This is because the second roll 20 and the third roll 30 are damaged thereby.

  In addition, the current collector foil 110 is passed through the second facing position B. For this reason, when the situation where the 2nd roll 20 and the 3rd roll 30 contact arises, the current collection foil 110 will be pinched and will be cut | disconnected. Even if the set value of the gap at the second facing position B is equal to or greater than the difference between GB1 and GB3, if GB3 is less than the thickness of the current collector foil 110, the second roll 20 and the third roll 30 As a result, the current collector foil 110 is strongly sandwiched.

  On the other hand, in the present embodiment, the gap at the second facing position B is adjusted by the gap adjustment in a state where the pressure object exists at the first facing position A and the second facing position B. For this reason, in this embodiment, the gap at the second facing position B can be adjusted without being affected by the movement accompanying the pressurization of the second roll 20. Therefore, it is possible to suppress the contact between the second roll 20 and the third roll 30, the sandwiching of the current collector foil 110 by the second roll 20 and the third roll 30, and the like. In this embodiment, the electrode plate 100 having the active material layer 120 that is uniform and thin can be manufactured.

  In addition, even if the size of the gap at the second facing position B is the same, the circumference between the second roll 20 and the third roll 30 represented by the circumferential speed of the third roll 30 with respect to the circumferential speed of the second roll 20. The lower the speed ratio, the thinner the active material layer 120 after passing through the gap at the second facing position B. That is, the lower the peripheral speed ratio between the second roll 20 and the third roll 30, the better.

  When the gap adjustment is not performed, the difference between GB3 and GB4 shown in FIG. 7 tends to increase as the peripheral speed ratio between the second roll 20 and the third roll 30 is lowered. That is, when the gap adjustment is not performed, the thickness of the active material layer 120 is reduced by reducing the peripheral speed ratio between the second roll 20 and the third roll 30 in order to reduce the thickness of the active material layer 120 in the electrode plate 100. There is a problem that the difference between the thick and thin portions becomes large.

  However, in this embodiment, such a problem does not occur because the size of the gap at the second facing position B can be made constant by adjusting the gap. Therefore, in this embodiment, the peripheral speed ratio between the second roll 20 and the third roll 30 can be lowered, and the electrode plate 100 having the active material layer 120 that is uniform and thin can be manufactured.

  As described above in detail, the electrode plate manufacturing apparatus 1 according to the present embodiment is a separated state in which the film forming process is such that the gap between the second roll 20 and the third roll 30 is GB2 larger than GB1. Start as. And after the front-end | tip of the active material layer 131 formed on the 2nd roll 20 by the film-forming process arrives at the 2nd opposing position B, in the state which the active material layer 131 exists in the 2nd opposing position B, The gap adjustment is performed so that the size of the gap between the second roll 20 and the third roll 30 is GB1. Thereby, the manufacturing method of the electrode plate which has the active material layer of uniform thickness is implement | achieved.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in the above embodiment, the case where the active material layer 120 is formed only on the first surface 111 of the current collector foil 110 has been described. However, the active material layer 120 is also formed on the second surface 112 of the current collector foil 110. be able to. The formation of the active material layer 120 on the second surface 112 of the current collector foil 110 can also be performed in the same manner as in the case of forming on the first surface 111 described in the above embodiment.

  Further, for example, when the electrode material 130 is a powder component such as the active material 121 and the binder 122, a solvent is added to remove the solvent after the active material layer 120 is transferred to the current collector foil 110. The active material layer 120 may be dried.

  Further, for example, in the above embodiment, the adhesion surface of the active material layer at the facing position is controlled by the peripheral speed difference. However, the active material layer 131 formed at the first facing position A has a larger radius of curvature at the first facing position A among the outer circumferential surface 11 of the first roll 10 and the outer circumferential surface 21 of the second roll 20. Tend to adhere to. Further, even at the second facing position B, the pressurized active material layer 131 has a radius of curvature at the second facing position B out of the outer peripheral surface 21 of the second roll 20 and the first surface 111 of the current collector foil 110. It tends to adhere to the larger surface. For this reason, unlike the above-mentioned embodiment, it is good also as controlling the adhesion surface of the active material layer in an opposing position with the diameter of a roll. Moreover, it is also possible to control the adhesion surface of the active material layer at the facing position by both the peripheral speed difference and the roll diameter.

  For example, in the above embodiment, the gap adjustment is performed by moving the first roll 10 and the second roll 20. However, the movement related to the clearance adjustment may be performed by the movement of the third roll 30. That is, the gap adjustment can be performed by moving at least one of the second roll 20 and the third roll 30 with respect to the other.

  For example, in the electrode plate manufacturing apparatus 1 according to the above-described embodiment, the first roll 10, the second roll 20, and the third roll 30 are arranged in the same horizontal plane. However, the arrangement of the first roll 10, the second roll 20, and the third roll 30 is not limited to this.

  Specifically, for example, the arrangements shown in (a), (b), and (c) of FIG. In FIG. 8A, the third roll 30 is disposed below the second roll 20. And when Fig.8 (a) is employ | adopted, what is necessary is just to move the 1st roll 10 and the 2nd roll 20 upward and downward in clearance adjustment.

  Further, in FIG. 8B, the first roll 10 is disposed below the second roll 20 and the electrode material 130 is supplied from the left side of the first facing position A. And when FIG.8 (b) is employ | adopted, what is necessary is just to move the 1st roll 10 and the 2nd roll 20 leftward and rightward in clearance gap adjustment.

  Moreover, in FIG.8 (c), while the current collection foil 110 is conveyed upward, the 1st roll 10, the 2nd roll 20, and the partition part 90 of the structure of FIG.8 (b) are current collection foil. 110 are arranged symmetrically. In the configuration of FIG. 8C, each of the two second rolls 20 also functions as the third roll 30 in the above configuration. Further, the configuration of FIG. 8C allows the film forming process and the transfer process to be simultaneously performed on both surfaces of the current collector foil 110. In the case of adopting FIG. 8C, in the gap adjustment, the set of the first roll 10 and the second roll 20 provided with the current collector foil 110 interposed therebetween can be moved in a direction away from each other and a direction closer to each other. That's fine.

DESCRIPTION OF SYMBOLS 1 Electrode plate manufacturing apparatus 10 1st roll 20 2nd roll 30 3rd roll 100 Electrode plate 110 Current collection foil 120,131 Active material layer 121 Active material 122 Binder 130 Electrode material A 1st opposing position B 2nd opposing position

Claims (1)

A first roll and a second roll that rotate in directions in which the outer circumferential surfaces face each other and the movement directions of the outer circumferential surfaces at the first position where the outer circumferential surfaces face each other are the same;
The second roll and one outer peripheral surface are opposed to each other at a second position other than the first position, and the movement direction of the outer peripheral surface at the second position is the outer peripheral surface of the second roll. An electrode plate manufacturing apparatus having a third roll rotating in the same direction as the moving direction of
Passing an electrode material containing at least an active material and a binder to the first position where the size of the gap between the first roll and the second roll is set to a first set value, A film forming step of forming an active material layer on the second roll;
The active material layer on the second roll is moved to the third roll at the second position where the size of the gap between the second roll and the third roll is set to a second set value. In the method of manufacturing an electrode plate having a transfer step in which the active material layer is transferred onto the current collector foil and passed through the current collector foil wound around the current collector foil,
Starting the film forming step with the gap between the second roll and the third roll being in a separated state larger than the second set value;
After the tip of the active material layer formed on the second roll by the film forming process started reaches the second position, the active material layer exists in the second position. , A gap in which at least one of the second roll and the third roll is moved toward the other, and the size of the gap between the second roll and the third roll is the second set value. A method for manufacturing an electrode plate, wherein adjustment is performed.

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