JP2012132855A - Inspection method and inspection device of electrode sheet for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method and inspection device of electrode sheet for battery which can detect a defect position of an electrode sheet for battery.SOLUTION: An inspection method and inspection device of electrode sheet for battery is for inspecting an electrode sheet in which an electrode layer and an insulator layer are laminated in this order, and the inspection method and inspection device divides an inspection region of the electrode sheet to apply inspection voltage and can detect current passing through the electrode sheet with the applied inspection voltage, which allows a defect position of the electrode sheet for battery to be detected.

Description

  The present invention relates to a technical field of an inspection method and an inspection apparatus for a battery electrode sheet such as a lithium battery.

  As an inspection method for this type of battery electrode sheet, the current flowing along with the application of the inspection voltage was measured and applied in advance while applying the inspection voltage to the porous insulating layer formed on the electrode plate. Patent Document 1 discloses an inspection method for determining a defect that leads to an internal short circuit of an electrode plate as compared with an electric current.

  Patent Document 1 discloses an inspection apparatus for a battery electrode sheet, in which an electrode plate on which a porous insulating layer is formed is run by an electrode plate unwinding / removing roll and is rotated on a roller shaft that rotates in synchronization with the running. An inspection apparatus for inspecting an electrode plate with electrodes is disclosed.

JP 2010-40362 A

  However, in this type of battery electrode sheet inspection method and inspection apparatus, there is a problem in that it is impossible to detect the defect position in the direction of travel of the electrode plate, in other words, in the direction perpendicular to the inspection direction. For example, when the electrode plate is mass-produced, the fact that the defect position of the electrode plate cannot be detected leads to the deterioration of the yield of the electrode plate, so that this problem becomes more serious.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the inspection method and inspection apparatus of the electrode sheet for batteries which can detect the defect position of an electrode sheet.

  In order to solve the above-described problems, a battery electrode sheet inspection method according to the present invention is a battery electrode sheet inspection method for inspecting an electrode sheet laminated in the order of an electrode layer and an insulating layer, the electrode The inspection area of the sheet is divided and an inspection voltage is applied, and a current flowing through the electrode sheet is detected in accordance with the applied inspection voltage.

  Here, the electrode sheet means a sheet in which an electrode layer and an insulating layer are laminated in this order. An electrode layer refers to a layer including an active material layer. The electrode layer may be the active material layer itself, or may be a laminate of the current collector and the active material layer. Examples of the insulating layer include a separator, a porous sheet, a fibrous sheet, and a solid electrolyte layer.

  The inspection area means an area for inspecting the electrode sheet. Specifically, in the electrode sheet, it means a region where at least one of the electrode layer and the insulating layer is present.

  The inspection voltage means a potential difference between two points in the stacking direction of the electrode sheets.

  The inspection method for a battery electrode sheet according to the present invention divides the inspection region of the electrode sheet during the inspection. Specifically, the inspection voltage is applied by dividing the inspection area of the electrode sheet. And the electric current which flows into an electrode sheet with the applied test voltage is detected.

  The inspection area is divided by, for example, relatively moving one inspection apparatus in accordance with the inspection area to be measured and arranging a plurality of inspection apparatuses for each inspection area to be measured. Can be mentioned.

  Examples of the application of the inspection voltage include applying the inspection device in contact with the electrode sheet and applying the inspection device to the electrode sheet in a non-contact manner. In the case of contact, a roll or the like can be used. In the case of non-contact, the inspection can be performed in a box filled with an inert gas. By using an inert gas, an electric current can be passed even if it is non-contact.

  The detection of the current can include, for example, detecting the amount of current, in other words, detecting the current value, detecting whether the current has flown, or not.

  The inspected electrode sheet is assembled as a battery. Here, if a defective electrode sheet is assembled as a battery, problems such as deterioration of battery performance and internal short-circuiting may occur unless some measures are taken. In addition, it is inefficient to inspect the assembled battery in order to inspect the electrode sheet for defects. And it is difficult to specify the cause of the defect, for example, the malfunction of the equipment, simply by detecting the defect of the electrode sheet.

  However, according to the inspection method for a battery electrode sheet according to the present invention, it is possible to detect a defect position of the electrode sheet. More specifically, by dividing the inspection area of the electrode sheet, it is possible to detect the inspection direction of the defect of the electrode sheet and the position in the direction perpendicular to the inspection direction. In other words, the defect position of the electrode sheet can be detected in two dimensions. Therefore, for example, it becomes easy to identify the cause of the defect of the electrode sheet such as a malfunction of the equipment and to remove only the defective part, and the electrode sheet can be produced with a high yield.

  In one aspect of the battery electrode sheet inspection method according to the present invention, the battery electrode sheet inspection method further includes a method of estimating a defect position of the electrode sheet from the detected current value.

  According to this aspect, the defect position of the electrode sheet can be estimated from the detected current value. For example, when a plurality of inspection apparatuses are used, the defect position can be estimated by associating the current value flowing through each inspection apparatus with the position of the inspection region inspected by each inspection apparatus. When one inspection apparatus is used, the defect position can be estimated by associating the current value flowing through the inspection apparatus with the position of the inspection region inspected by the inspection apparatus.

  In another aspect of the method for inspecting a battery electrode sheet according to the present invention, the inspection direction is at least one of a transfer direction of the electrode sheet and a longitudinal direction of the electrode sheet.

  According to this aspect, the inspection of the electrode sheet can be efficiently performed because the inspection direction is the transfer direction of the electrode sheet. On the other hand, even when the inspection direction is the longitudinal direction of the electrode sheet, the electrode sheet can be inspected efficiently. And when the direction of a test | inspection is the transfer direction of an electrode sheet and the longitudinal direction of an electrode sheet, an electrode sheet can be test | inspected more efficiently.

  In another aspect of the battery electrode sheet inspection method according to the present invention, the insulating layer is a solid electrolyte layer.

  According to this aspect, the defect position of the electrode sheet provided with the solid electrolyte layer can be detected.

  In order to solve the above-described problems, a battery electrode sheet inspection apparatus according to the present invention is a battery electrode sheet inspection apparatus that inspects an electrode sheet laminated in the order of an electrode layer and an insulating layer, the electrode A first measuring means that is disposed on the insulating layer of the sheet and that divides the inspection region of the electrode sheet and applies a voltage for inspection; and a conductive measuring terminal; and the first measuring means with respect to the first measuring means A second measuring means having a conductive measuring terminal disposed on the electrode layer with an electrode sheet interposed therebetween, and the electrode according to the inspection voltage applied by the first measuring means and the second measuring means; Detecting means for detecting a current flowing in the sheet.

  Here, the electrode sheet means a sheet in which an electrode layer and an insulating layer are laminated in this order. An electrode layer refers to a layer including an active material layer. The electrode layer may be the active material layer itself, or may be a laminate of the current collector and the active material layer. Examples of the insulating layer include a separator, a porous sheet, a fibrous sheet, and a solid electrolyte layer.

  The inspection area means an area for inspecting the electrode sheet. Specifically, in the electrode sheet, it means a region where at least one of the electrode layer and the insulating layer is present.

  The inspection voltage means a potential difference between two points in the stacking direction of the electrode sheets.

  A 1st measurement means is arrange | positioned at the said insulating layer of the said electrode sheet, divides | segments the test | inspection area | region of the said electrode sheet, applies the voltage for a test | inspection, and means what has a conductive measurement terminal.

  A 2nd measurement means means what has an electroconductive measurement terminal arrange | positioned in the lamination direction of the said electrode sheet on both sides of the said electrode sheet with respect to the said 1st measurement means.

  The conductive measuring terminals of the first measuring means and the second measuring means mean a portion where an inspection voltage is applied to the electrode sheet and current flows through the applied voltage. Examples of the material for the conductive measurement terminal include SUS, aluminum, nickel, iron, titanium, copper, and carbon.

  The detecting means broadly means a means for detecting the current flowing through the electrode sheet in accordance with the inspection voltage applied by the first measuring means and the second measuring means. For example, an ammeter, a thermocouple, a fuse, etc. can be mentioned. In a narrow sense, the detection means means an ammeter that detects the current flowing through the electrode sheet in accordance with the inspection voltage applied by the first measurement means and the second measurement means.

  There may be one first measuring means or a plurality of first measuring means. The inspection method when there is one first measuring means is, for example, a method of moving the first measuring means according to the inspection area to be divided and inspected, an electrode sheet according to the inspection area to be divided and inspected And a method of moving the first measuring means and the electrode sheet according to the inspection area to be divided and inspected. Examples of the inspection method when there are a plurality of first measuring means include a method of arranging the first measuring means for each inspection region to be divided and measured.

  There may be one or more second measuring means. The inspection method when the second measuring means is singular includes, for example, a method of moving the second measuring means together with the first measuring means that moves according to the inspection area to be divided and inspected, and the second And a method of arranging the measuring means on the entire inspection area and facing the plurality of first measuring means arranged for each inspection area. Examples of the inspection method when there are a plurality of second measuring means include a method of arranging the second measuring means for each inspection region to be divided and measured.

  The first measurement unit and the second measurement unit may be in contact with the electrode sheet or may be non-contact. In particular, it is preferable to contact the electrode sheet. By contacting the electrode sheet, it is possible to inspect the electrode sheet in a state where pressure is applied. In the case of contact, use of a roll, a flat plate, etc. can be mentioned, for example. In the case of non-contact, for example, an inspection in a box filled with an inert gas can be given. By using an inert gas, an electric current can be passed even if it is non-contact.

  The inspection apparatus for a battery electrode sheet according to the present invention configured as described above divides the inspection area of the electrode sheet during the inspection. Specifically, the inspection voltage is applied by dividing the inspection area of the electrode sheet. And the electric current which flows into an electrode sheet with the applied test voltage is detected.

  The inspected electrode sheet is assembled as a battery. Here, if a defective electrode sheet is assembled as a battery, problems such as deterioration of battery performance and internal short-circuiting may occur unless some measures are taken. In addition, it is inefficient to inspect the assembled battery in order to inspect the electrode sheet for defects. And it is difficult to specify the cause of the defect, for example, the malfunction of the equipment, simply by detecting the defect of the electrode sheet.

  However, according to the inspection apparatus for a battery electrode sheet according to the present invention, it is possible to detect a defect position of the electrode sheet. More specifically, by dividing the inspection area of the electrode sheet, it is possible to detect the inspection direction of the defect of the electrode sheet and the position in the direction perpendicular to the inspection direction. In other words, the defect position of the electrode sheet can be detected in two dimensions. Therefore, for example, it becomes easy to identify the cause of the defect of the electrode sheet such as a malfunction of the equipment and to remove only the defective part, and the electrode sheet can be produced with a high yield.

  In one aspect of the inspection apparatus for battery electrode sheets according to the present invention, the inspection apparatus for battery electrode sheets further includes estimation means for estimating a defect position of the electrode sheet from the current value detected by the detection means. Prepare.

  An estimation means means what estimates a defect position based on the detected electric current value. The estimation means is, for example, a device that includes a processor, a memory, and the like.

  According to this aspect, the estimation means can estimate the defect position of the electrode sheet from the detected current value. For example, when a plurality of inspection apparatuses are used, the estimation method of the defect position by the estimation means can include associating the current value flowing through each inspection apparatus with the position of the inspection region inspected by each inspection apparatus. . When one inspection apparatus is used, the value of the current flowing through the inspection apparatus can be associated with the position of the inspection area inspected by the inspection apparatus.

  In another aspect of the inspection apparatus for a battery electrode sheet according to the present invention, the first measuring means is in contact with the insulating layer of the electrode sheet, and the second measuring means is an electrode layer of the electrode sheet. It touches.

  According to this aspect, the first measurement unit and the second measurement unit are in contact with the electrode sheet, so that it is easy to detect the defect position of the electrode sheet. For example, when there is a defect in the electrode sheet, the active material enters the defect part by contact, and it becomes easy to form a closed circuit in the first measurement means and the second measurement means. Further, when there is a foreign substance on the electrode sheet, the foreign substance is pushed by contact, and it becomes easy to form a closed circuit in the first measuring means and the second measuring means.

  In addition, the 1st measurement means and the 2nd measurement means may be contacting so that an electrode sheet may be pressurized.

  In another aspect of the inspection apparatus for a battery electrode sheet according to the present invention, a plurality of the first measurement means are arranged so that the conductive measurement terminals are arranged for each of the inspection regions to be divided and measured. It is characterized by that.

  According to this aspect, by arranging a plurality of first measuring means, it is possible to inspect typically without moving the first measuring means in a direction perpendicular to the inspection direction. Further, the inspection can be performed without moving the electrode sheet in the direction perpendicular to the inspection direction. Therefore, it becomes easy to divide and inspect the measurement region.

  In another aspect of the inspection apparatus for battery electrode sheets according to the present invention, the first measuring means is a first roll having a conductive outer peripheral surface that contacts the insulating layer of the electrode sheet, The second measuring means has a conductive flat plate in contact with the electrode layer of the electrode sheet.

  Here, the roll means one that rotates in the direction of inspection. A flat plate means that the surface which contacts an electrode sheet is a plane.

  According to this aspect, since the first measuring means is a roll, the insulating layer of the electrode sheet can be efficiently inspected. For example, the inspection can be performed without applying shear stress that is not necessary for the inspection to the insulating layer of the electrode sheet. Since the second measuring means is a flat plate, the electrode sheet can be supported stably.

  In addition, the 1st measurement means and the 2nd measurement means may be contacting so that an electrode sheet may be pressurized.

  In another aspect of the inspection apparatus for battery electrode sheets according to the present invention, the first measuring means is a first roll having a conductive outer peripheral surface that contacts the insulating layer of the electrode sheet, The second measuring means is a second roll having a conductive outer peripheral surface in contact with the electrode layer of the electrode sheet.

  According to this aspect, the electrode sheet is inspected by being sandwiched between the first roll and the second roll in the stacking direction. Therefore, the electrode sheet can be inspected efficiently. For example, the inspection can be performed without applying shear stress that is not necessary for the inspection to the insulating layer and the electrode layer of the electrode sheet.

  In another aspect of the inspection apparatus for battery electrode sheets according to the present invention, a plurality of the first rolls are arranged so that the conductive outer peripheral surface is arranged for each of the inspection regions to be measured in a divided manner. It is characterized by that.

  According to this aspect, by arranging a plurality of first rolls, it is typically possible to inspect without moving the first roll in a direction perpendicular to the inspection direction. Further, the inspection can be performed without moving the electrode sheet in the direction perpendicular to the inspection direction. Therefore, it becomes easy to divide and inspect the measurement region.

  In another aspect of the inspection apparatus for a battery electrode sheet according to the present invention, the inspection direction is at least one of a transfer direction of the electrode sheet and a longitudinal direction of the electrode sheet.

  According to this aspect, the inspection of the electrode sheet can be efficiently performed because the inspection direction is the transfer direction of the electrode sheet. On the other hand, even when the inspection direction is the longitudinal direction of the electrode sheet, the electrode sheet can be inspected efficiently. And when the direction of a test | inspection is the transfer direction of an electrode sheet and the longitudinal direction of an electrode sheet, an electrode sheet can be test | inspected more efficiently.

  In another aspect of the inspection apparatus for a battery electrode sheet according to the present invention, the insulating layer is a solid electrolyte layer.

  According to this aspect, the defect position of the electrode sheet provided with the solid electrolyte layer can be detected.

  In this invention, the inspection method and inspection apparatus which can detect the defect position of the electrode sheet for batteries can be provided.

1 is a perspective view conceptually showing a first embodiment. It is a side view which represents a 1st embodiment notionally. It is a perspective view showing notionally a measurement flat plate of a 1st embodiment. It is a perspective view showing notionally the alligator clip of a 1st embodiment. It is a flowchart which expresses the inspection method of a 1st embodiment notionally. It is a top view showing the 1st modification of 1st Embodiment. It is a perspective view showing the 2nd modification of 1st Embodiment. It is a side view showing the 3rd modification of a 1st embodiment. It is a side view showing a 2nd embodiment notionally. It is a side view which represents a 3rd embodiment notionally. It is a side view which represents a 4th embodiment notionally.

  The battery electrode sheet inspection method and inspection apparatus of the present invention will be described in detail below.

  Hereinafter, a first embodiment of the present invention will be described in detail.

  With reference to FIGS. 1-8, the test | inspection method and test | inspection apparatus of the electrode sheet for batteries which concern on 1st real form are demonstrated. FIG. 1 is a perspective view showing an appearance of the inspection apparatus 1000, and FIG. 2 is a part of a side view of the inspection apparatus 1000 viewed from the side. FIG. 3 is a perspective view showing the appearance of the measurement flat plate 5 of the inspection apparatus 1000. FIG. 4 is a perspective view showing the appearance of the alligator clip 100 of the inspection apparatus 1000. FIG. 5 is a flowchart conceptually showing the inspection method of the first embodiment. FIG. 6 is a plan view of a first modified example having the same concept as when FIG. 1 representing the first embodiment is viewed from above. FIG. 7 is a perspective view illustrating a second modification of the embodiment. FIG. 8 is a side view having the same concept as in FIG. 2 showing a third modification of the embodiment.

  1 and 2, an inspection apparatus 1000 is an example of an “inspection apparatus” according to the present invention that includes a measurement roll 85, a power supply 90, a measurement flat plate 5, and an ammeter 130. 1 and 2, an electrode sheet 45 to be inspected by the inspection apparatus 1000 and a winding roll 120 for winding the electrode sheet 45 are illustrated.

  As shown in FIGS. 1 and 2, the electrode sheet 45 includes an insulating layer 40, an active material layer 30, and a current collector 20, and is stacked in this order.

  Examples of the insulating layer 40 include a separator, a porous sheet, a fibrous sheet, and a solid electrolyte layer. Examples of the separator include a polyolefin microporous film represented by polyethylene and polypropylene.

Examples of the material used for the solid electrolyte layer include a sulfide-based solid electrolyte and an oxide-based solid electrolyte. The sulfide-based solid electrolyte is not particularly limited as long as it contains a sulfur component and has ionic conductivity. Include, for _{example, Li 2 S-P 2 S} 5, 70Li 2 S-30P 2 S 5, 80Li 2 S-20P 2 S 5, Li 2 S-SiS 2, and _{LiGe 0.25} P _0.75 S _4, etc. be able to. The oxide-based solid electrolyte, for _{example, LiPON, Li 1 + X Al} X Ti 2-X (PO 4) 3, Li 1 + X Al X Ge 2-X (PO 4) 3, Li 7 La 3 Zr 2 O 12 and, it can be mentioned li ₅ La ₃ Nb ₂ O ₁₂ and the like. The inorganic solid electrolyte 10 can be used alone or in combination of two or more.

  The material of the current collector 20 is not particularly limited as long as it has conductivity. For example, SUS, aluminum, nickel, iron, titanium, copper, carbon, etc. can be mentioned. The current collector of the positive electrode is preferably a SUS foil and an aluminum foil, and more preferably an aluminum foil. The current collector of the negative electrode is preferably a SUS foil and a copper foil, and more preferably a copper foil.

  Examples of the active material layer 30 include a positive electrode active material layer and a negative electrode active material layer.

As the material used for the positive electrode active material layer, the same materials as those used for various existing lithium batteries can be used. Examples of the positive electrode active material include a sulfide-based active material and an oxide-based active material. Examples of the sulfide-based active material include TiS ₂ , MoS ₂ , FeS, FeS ₂ , CuS, and NiS ₂ . Examples of the oxide-based active material include Bi ₂ O ₃ , Bi ₂ Pb ₂ O ₅ , CuO, V ₆ O ₁₃ , LiCoO ₂ , LiCrO ₂ , LiNiO ₂ , LiMn ₂ O ₄ , Li ₂ NiMn ₃ O ₈ , Li ₃ NiMnCoO ₆ , LiMgMn ₃ O ₈ , LiNiGe ₃ O ₈ , LiNiVO ₂ , LiCoVO ₂ , LiFePO ₄ , and LiCoPO ₄ can be exemplified. A positive electrode active material can be used individually by 1 type, or can be used in combination of 2 or more type.

  The positive electrode active material layer includes a conductive material, an ion conductivity improving material, a binder material, and the like as necessary.

  Examples of the conductive material include carbon fiber, ketjen black, and acetylene black. One type of conductive material can be used alone, or two or more types can be used in combination.

  As the ion conductive material, the same materials as those used in various existing lithium batteries can be used. Examples of the ion conductive material include the aforementioned sulfide-based solid electrolyte and oxide-based solid electrolyte. An ion conductive material can be used individually by 1 type, or can be used in combination of 2 or more types.

  Examples of the binder material include synthetic rubbers such as styrene butadiene rubber, fluorine rubber, and ethylene propylene diene, and polymer materials such as polyvinylidene fluoride. Binder materials can be used alone or in combination of two or more.

As the material used for the negative electrode active material layer, the same materials as those used for various existing lithium batteries can be used. Examples of the negative electrode active material include carbon materials, Li metals, Li alloys, oxide materials, and nitride materials. Examples of the carbon-based material include graphite, carbon nanotube, mesocarbon microbead, highly oriented graphite, hard carbon, and soft carbon. Examples of the Li alloy include an alloy of Li and Mg, Ca, Al, Si, Ge, Sn, Pb, As, Sb, Bi, Ag, Au, Zn, Cd, and Hg. Examples of the oxide material include Nb ₂ O ₅ , TiO ₂ , Li ₄ Ti ₅ O ₁₂ , WO ₂ , and Fe ₂ O ₃ . As the nitride material, for _{example, Li 3-X Co X N} , Li 3-X Ni X N, can be exemplified _{Li 3-X} Cu X N and the like. A negative electrode active material can be used individually by 1 type, or can be used in combination of 2 or more type.

  The negative electrode active material layer includes a conductive material, an ion conductivity improving material, a binder material, and the like as necessary. As the conductive material, the ion conductivity improving material, the binder material, and the like, the same materials as those used for the positive electrode active material layer described above can be used.

  The winding roll 120 is a roll that winds up the electrode sheet 45, and DR125 represents the rotation direction of the winding roll. The winding roll 120 is not particularly limited as long as the electrode sheet 45 can be wound. As the winding roll 120, one kind of roll can be used alone, or two or more kinds of rolls can be used in combination. DR55 represents the transfer direction of the electrode sheet 45 taken up by the take-up roll 120. In FIG. 1, DR 55 is also the longitudinal direction of the electrode sheet 45. Note that the direction perpendicular to the DR 55 and parallel to the electrode sheet 45 is the short direction of the electrode sheet 45.

  The measurement roll 85 includes a conductive roll 70 and an insulating roll 80 that are in contact with the insulating layer 40 of the electrode sheet 45, and the power is transmitted by the roll shaft 60 to rotate. DR65 represents the rotation direction of the roll shaft. Note that the measurement roll 85 may be configured such that the roll shaft 60 is fixed and the conductive roll 70 and the insulating roll 80 rotate freely. At this time, the roll shaft 60 becomes an axis of the conductive roll 70 and the insulating roll 80. The conductive roll 70 and the insulating roll 80 may be one continuous roll, or the conductive roll 70 and the insulating roll 80 may be independent of each other.

  The electroconductive roll 70 means what has an electroconductive material in an outer peripheral surface. The material of the outer peripheral surface of the conductive roll 70 is not particularly limited as long as it has conductivity. For example, aluminum, iron, copper, etc. can be mentioned.

  The insulating roll 80 means one having an insulating material on the outer peripheral surface. The material of the outer peripheral surface of the insulating roll 80 is not particularly limited as long as it has insulating properties. For example, resin, ceramics, rubber, etc. can be mentioned.

  In FIG. 1, the measurement roll 85 is arranged so as to divide the inspection area of the electrode sheet 45. That is, the three measuring rolls 85 are arranged such that the rotation direction of the conductive roll 70 is along the transfer direction DR55 of the electrode sheet 45, and the conductive rolls 70 are arranged in a stepwise manner. Therefore, the inspection area of the electrode sheet 45 to be inspected by the measuring roll 85 is divided into three.

  FIG. 3 is a perspective view showing the appearance of the measurement flat plate 5. The measurement flat plate 5 includes a conductive flat plate 10 and an insulating flat plate 15 that are in contact with the current collector 20 of the electrode sheet 45. The conductive flat plate 10 of the measurement flat plate 5 is disposed to face the conductive roll 70 in the stacking direction of the electrode sheet 45 with the electrode sheet 45 interposed therebetween. In other words, the electrode sheet 45 is sandwiched between the conductive roll 70 and the conductive flat plate 10. The conductive flat plates 10 and the insulating flat plates 15 are alternately arranged in the transfer direction.

  The conductive flat plate 10 means that the surface in contact with the electrode sheet 45 is a flat surface. The material of the conductive flat plate 10 is not particularly limited as long as it has conductivity. For example, aluminum, iron, copper, etc. can be mentioned.

  The insulating flat plate 15 means that the surface in contact with the electrode sheet 45 is a flat surface. The material of the insulating flat plate 15 is not particularly limited as long as it has insulating properties. For example, resin, ceramics, rubber, etc. can be mentioned.

  FIG. 4 is a perspective view showing the appearance of the alligator clip 100. The alligator clip 100 sandwiches the roll shaft 60 and can apply a test voltage even when the measurement roll 85 is rotating. The material of the alligator clip 100 is not particularly limited as long as it has conductivity. For example, aluminum, iron, copper, etc. can be mentioned. In addition, even if it is aspects other than the alligator clip 100, if the voltage for a test | inspection can be applied to the electrode sheet 45 in the state which the roll 85 for a measurement is rotating, it will not specifically limit.

  As the power source 90 and the ammeter 130, the same ones as various existing power sources and ammeters can be used. 1 and 2, the power supply 90 and the ammeter 130 are connected in the order of the conductive plate 10 of the measurement plate 5, the ammeter 130, the power supply 90, the alligator clip 100, and the conductive roll 70 of the measurement roll 85. Has been. The order of connection between the ammeter 130 and the power source 90 may be reversed.

  The inspection method of the first embodiment configured as described above will be described step by step with reference to FIG.

  First, in the first electrode sheet winding process, the electrode sheet 45 is wound by the winding roll 120 (step S10). That is, the winding roll 120 rotates in the direction of DR 125 and winds up the electrode sheet 45.

  Next, in the inspection voltage application step, an inspection voltage is applied to the electrode sheet 45 (step S20). Specifically, the inspection voltage generated by the power supply 90 is applied to the electrode sheet 45 by the measurement roll 85 and the measurement flat plate 5.

  Subsequently, in the electrode sheet pressurizing step, the measurement roll 85 presses the electrode sheet 45 (step S30). Here, if there is a defect or the like in the insulating layer 40 of the electrode sheet, a part of the active material layer 30 enters the defective portion 50 of the insulating layer by pressurization as shown in FIGS. Then, current flows through the conductive roll 70 of the measurement roll 85, the defect 50 of the insulating layer, the active material layer 30, the current collector 20, and the conductive flat plate 10 of the measurement flat plate 5. Even when there is a foreign matter on the surface of the insulating layer 40, the conductive roll 70 of the measurement roll 85, the foreign matter, the active material layer 30, the current collector 20, and the conductive flat plate 10 of the measurement flat plate 5 are applied by pressure. Current will flow. Note that steps S20 and S30 may be performed simultaneously, and the order of steps S20 and S30 may be reversed.

  In the current detection step, the current flowing along with the application of the inspection voltage is detected (step S40). Current detection is performed by an ammeter 130.

  Further, in the determination step, it is determined from the detected current value whether the insulating layer 40 of the electrode sheet 45 is free from defects or foreign matter (step S50). The determination can be performed by, for example, an ammeter 130 or a determination device (not shown) connected to the ammeter 130. Examples of the determination method include a method of comparing with a preset current value, a method of determining based on whether or not a current flows.

  If it is determined that the electrode sheet 45 is defective, the defect position of the electrode sheet 45 is estimated from the detected current value in the defect position estimation step (step S60). The estimation can be performed by, for example, an ammeter 130 or an estimation device (not shown) connected to the ammeter 130 or a determination device (not shown). The estimation method includes, for example, associating the current value detected by the ammeter 130 with the position of the inspection region inspected by the measurement roll 85, and the current value detected by the ammeter 130 and the rotation speed of the measurement roll 85. The correspondence etc. can be mentioned.

  On the other hand, when it is determined that there is no defect in the electrode sheet 45, and after step S60 is completed, the winding of the electrode sheet is completed in the second electrode sheet winding process (step S70). In step S70 as well as step S10, the winding roll 120 rotates in the direction of DR125 and winds up the electrode sheet 45.

  Hereinafter, a first modification of the first embodiment of the present invention will be described in detail.

  FIG. 6 is a plan view of a first modified example having the same concept as when FIG. 1 representing the first embodiment is viewed from above.

  In the first modification, the measurement roll 86 has only a conductive outer peripheral surface. The measurement roll 86 is rotated by the power transmitted by the roll shaft. The measurement roll 86 may be configured to rotate freely with the roll shaft fixed. The measurement roll 86 is arranged so as to divide the inspection area of the electrode sheet 45. That is, in FIG. 6, the four measuring rolls 86 are arranged such that the rotation direction is along the transfer direction of the electrode sheet 45, and are arranged in steps. Therefore, the inspection area of the electrode sheet 45 to be inspected by the measurement roll 86 is divided into four.

  Hereinafter, the 2nd modification of 1st Embodiment of this invention is demonstrated in detail.

  FIG. 7 is a perspective view conceptually showing a second modification of the embodiment.

  In the second modification, the alligator clip 100 has a thermocouple 110 serving as a substitute for the ammeter 130. In the second modification, the current is detected by making the temperature of the thermocouple 110 correspond to the current value. That is, the thermocouple 110 can be used in step S40 of FIG.

  The thermocouple 110 is generated in a portion where current flows when a current flows through the measurement roll 85, a defective portion of the insulating layer, an active material layer, a current collector, and a measurement flat plate due to a defect in the electrode sheet. A temperature change can be detected. Then, the current is detected by making the temperature change correspond to the current value change. As long as the thermocouple 110 is a part capable of detecting temperature, the part to be arranged is not limited.

  Hereinafter, a third modification of the first embodiment of the present invention will be described in detail.

  FIG. 8 is a perspective view conceptually showing a third modification of the embodiment.

  In the third modified example, the measurement roll 85 includes a power supply 91 built in the main body of the measurement roll 85. In the third modified example, since the power supply 91 is built in the measurement roll 85, the degree of freedom such as the installation conditions of the measurement roll 85 is increased, and various embodiments can be supported.

  Hereinafter, the second embodiment of the present invention will be described in detail.

  With reference to FIG. 9, the inspection method and inspection apparatus of the battery electrode sheet according to the second embodiment will be described. FIG. 9 is a side view having the same concept as in FIG. 2 of the first embodiment.

  In FIG. 9, an inspection apparatus 1100 is an example of an “inspection apparatus” according to the present invention including a first measurement roll 87, a power supply 90, a second measurement roll 88, and an ammeter 130. In FIG. 9, the alligator clip 100, the roll shaft 60, the power supply 90, the ammeter 130, and the electrode sheet 45 are the same as in the first embodiment. In FIG. 9, the power supply 90 and the ammeter 130 are connected in the order of the first measurement roll 87, the alligator clip 100, the power supply 90, the ammeter 130, the alligator clip 100, and the second measurement roll 88. The order of the power supply 90 and the ammeter 130 may be reversed.

  The first measurement roll 87 has the same aspect as the measurement roll 85 of the first embodiment.

  The second measuring roll 88 includes a conductive roll 71 and an insulating roll 81 that are in contact with the current collector 20 of the electrode sheet 45, and the power is transmitted by the roll shaft 60 to rotate. The second measuring roll 87 may be configured such that the roll shaft 60 is fixed and the conductive roll 71 and the insulating roll 81 rotate freely. At this time, the roll shaft 60 becomes an axis of the conductive roll 71 and the insulating roll 81. The conductive roll 71 and the insulating roll 81 may be one continuous roll, or the conductive roll 71 and the insulating roll 81 may be independent of each other.

  The conductive roll 71 and the insulating roll 81 are in the same mode as the conductive roll 70 and the insulating roll 80 of the first embodiment.

  The conductive roll 71 of the first measurement roll 87 is disposed to face the conductive roll 71 of the second measurement roll in the stacking direction of the electrode sheet 45 with the electrode sheet 45 interposed therebetween. In other words, the electrode sheet 45 is sandwiched between the conductive rolls 71 of the first measurement roll 87 and the second measurement roll 88.

  In the second embodiment, similarly to the first embodiment, the first measurement roll 87 and the second measurement roll 88 are arranged so as to divide the inspection region of the electrode sheet 45. That is, the first measurement roll 87 and the second measurement roll 88 are arranged so that the rotation direction of the conductive roll 71 is along the transfer direction of the electrode sheet 45, and the conductive roll 71 is arranged in a stepwise manner. Therefore, the inspection region of the electrode sheet 45 inspected by the first measurement roll 87 and the second measurement roll 88 is divided.

  The inspection method according to the second embodiment configured as described above is similar to the inspection method according to the first embodiment.

  Hereinafter, the third embodiment of the present invention will be described in detail.

  With reference to FIG. 10, a battery electrode sheet inspection method and inspection apparatus according to a third embodiment will be described. FIG. 10 is a side view having the same concept as in FIG. 2 of the first embodiment.

  In FIG. 10, an inspection apparatus 1200 is an example of an “inspection apparatus” according to the present invention that includes a measurement roll 89, a power supply 90, a measurement flat plate 6, and an ammeter 130. In FIG. 10, the power source 90, the ammeter 130, and the electrode sheet 45 are the same as those in the first embodiment. In FIG. 10, the power supply 90 and the ammeter 130 are connected in the order of the measurement roll 89, the power supply 90, the ammeter 130, and the measurement flat plate 6. The order of the power supply 90 and the ammeter 130 may be reversed.

  The measurement roll 89 includes a conductive roll 72 that comes into contact with the insulating layer 40 of the electrode sheet 45 and moves while rotating on the insulating layer 40 for inspection. DR 135 represents the inspection direction of the measurement roll 89. The measurement roll 89 may be rotated by power as in the first embodiment, or may be configured to rotate freely. The conductive roll 72 is the same mode as the conductive roll 70 of the first embodiment.

  The measurement flat plate 6 includes a conductive flat plate 11 that contacts the current collector 20 of the electrode sheet 45. The conductive flat plate 11 is disposed to face the conductive roll 70 in the stacking direction of the electrode sheets 45 with the electrode sheet 45 interposed therebetween. In other words, the electrode sheet 45 is sandwiched between the conductive roll 72 and the conductive flat plate 11. The conductive flat plate 11 is the same mode as the conductive flat plate 10 of the first embodiment.

  In the third embodiment, the inspection is performed by moving the measurement roll 89 on the electrode sheet 45 so as to divide the inspection area of the electrode sheet 45. That is, when there is one measuring roll 89, the electrode sheet 45 is inspected a plurality of times in parallel with the DR 135. When there are a plurality of measurement rolls 89, the conductive rolls 72 are arranged so that the rotation direction of the conductive rolls 72 is along the DR 135, and the conductive rolls 72 are arranged in steps. Therefore, the inspection area of the electrode sheet 45 to be inspected by the measurement roll 89 is divided.

  Hereinafter, the fourth embodiment of the present invention will be described in detail.

  With reference to FIG. 11, a battery electrode sheet inspection method and inspection apparatus according to a fourth embodiment will be described. FIG. 11 is a side view having the same concept as in FIG. 2 of the first embodiment.

  In FIG. 11, an inspection apparatus 1300 is an example of an “inspection apparatus” according to the present invention that includes a pressing roll 82, a power supply 90, a first measurement flat plate 7, a second measurement flat plate 8, and an ammeter 130. . In FIG. 10, the power source 90, the ammeter 130, and the electrode sheet 45 are the same as those in the first embodiment. In FIG. 11, the power supply 90 and the ammeter 130 are connected in the order of the first measurement flat plate 7, the power supply 90, the ammeter 130, and the second measurement flat plate 8. The order of the power supply 90 and the ammeter 130 may be reversed.

  The first measurement flat plate 7 is in contact with the insulating layer 40 of the electrode sheet 45, and the second measurement flat plate 8 is in contact with the current collector 20 of the electrode sheet 45. The first measurement flat plate 7 and the second measurement flat plate 8 are conductive. The first measurement flat plate 7 is disposed to face the second measurement flat plate 8 in the stacking direction of the electrode sheets 45 with the electrode sheet 45 interposed therebetween. In other words, the electrode sheet 45 is sandwiched between the first measurement flat plate 7 and the second measurement flat plate 8. The 1st measurement flat plate 7 and the 2nd measurement flat plate 8 mean that the surface which contacts the electrode sheet 45 is a plane. The material for the first measurement flat plate 7 and the second measurement flat plate 8 is not particularly limited as long as it has conductivity. For example, aluminum, iron, copper, etc. can be mentioned.

  The pressure roll 82 moves while rotating on the first measurement flat plate 7 and pressurizes the electrode sheet 45 via the first measurement flat plate 7. DR140 represents the inspection direction. The pressurizing roll is not particularly limited as long as it can pressurize the electrode sheet 45.

  In the fourth embodiment, the pressure roll 82 moves on the first measurement flat plate 7 so as to divide the inspection region of the electrode sheet 45 and performs the inspection. That is, the pressing roll 82 inspects the first measuring flat plate 7 a plurality of times in parallel with the DR 135.

  In the inspection apparatus 1300 configured as described above, if there is a defect or the like in the insulating layer 40 of the electrode sheet, the defective portion 50 of the insulating layer 50 is pressed by the pressurizing roll 82 as shown in FIG. A part of the active material layer 30 enters. Then, current flows through the first measurement flat plate 7, the defect 50 of the insulating layer, the active material layer 30, the current collector 20, and the second measurement flat plate 8. Even when there is a foreign substance on the surface of the insulating layer 40, the current is passed through the first measurement flat plate 7, the foreign substance, the active material layer 30, the current collector 20, and the second measurement flat plate 8 by the pressure of the pressure roll 82. Begins to flow. Therefore, it is possible to detect the current that flows along with the application of the inspection voltage.

  The present invention can be appropriately changed without departing from the spirit or idea of the invention which can be read from the claims and the entire specification, and such a change is also included in the technical idea of the present invention.

5, 6 ... Measurement flat plate 7 ... First measurement flat plate 8 ... Second measurement flat plate 10, 11 ... Conductive flat plate 15 ... Insulating flat plate 20 ... Current collector 30 ... Active material layer 40 ... Insulating layer 45 ... Electrode Sheet 50 ... Insulating layer defect 60 ... Roll shaft 70, 71, 72 ... Conductive roll 80, 81 ... Insulating roll 82 ... Pressurizing roll 85, 86, 89 ... Measuring roll 87 ... First measuring roll 88 ... second measuring roll 90, 91 ... power supply 100 ... crocodile clip 110 ... thermocouple 120 ... winding roll 130 ... ammeter 1000, 1100, 1200, 1300 ... inspection device DR65 ... roll shaft rotation direction DR55 ... electrode sheet DR125: Direction of take-up roll rotation DR135, DR140: Inspection direction

Claims (13)

An inspection method for a battery electrode sheet for inspecting an electrode sheet laminated in the order of an electrode layer and an insulating layer,
An inspection method for a battery electrode sheet, wherein an inspection voltage is divided and an inspection voltage is applied, and a current flowing through the electrode sheet is detected in accordance with the applied inspection voltage.   The method for inspecting a battery electrode sheet according to claim 1, wherein the method for inspecting a battery electrode sheet further includes a method of estimating a defect position of the electrode sheet from the detected current value.   The method for inspecting a battery electrode sheet according to claim 1, wherein the inspection direction is at least one of a transfer direction of the electrode sheet and a longitudinal direction of the electrode sheet.   The said insulating layer is a solid electrolyte layer, The inspection method of the electrode sheet for batteries as described in any one of Claims 1-3 characterized by the above-mentioned. An inspection apparatus for a battery electrode sheet for inspecting an electrode sheet laminated in the order of an electrode layer and an insulating layer,
A first measuring means which is disposed on the insulating layer of the electrode sheet and divides an inspection region of the electrode sheet and applies a voltage for inspection;
A second measuring means having a conductive measuring terminal disposed on the electrode layer with the electrode sheet sandwiched between the first measuring means;
Detecting means for detecting a current flowing in the electrode sheet in accordance with a voltage for inspection applied by the first measuring means and the second measuring means;
An inspection apparatus for battery electrode sheets, comprising:   6. The battery electrode according to claim 5, wherein the battery electrode sheet inspection apparatus further includes an estimation unit configured to estimate a defect position of the electrode sheet from a current value detected by the detection unit. Sheet inspection device. The first measuring means is in contact with the insulating layer of the electrode sheet;
The battery electrode sheet inspection apparatus according to claim 5 or 6, wherein the second measuring means is in contact with the electrode layer of the electrode sheet.   The plurality of first measuring means are arranged so that the conductive measuring terminals are arranged for each of the inspection regions to be divided and measured, respectively. 4. The inspection apparatus for battery electrode sheets according to 1. The measurement terminal of the first measuring means is a first roll having a conductive outer peripheral surface that contacts the insulating layer of the electrode sheet,
The inspection apparatus for a battery electrode sheet according to claim 5 or 6, wherein the second measuring means has a conductive flat plate in contact with the electrode layer of the electrode sheet. The measurement terminal of the first measuring means is a first roll having a conductive outer peripheral surface that contacts the insulating layer of the electrode sheet,
7. The battery according to claim 5, wherein the measurement terminal of the second measurement unit is a second roll having a conductive outer peripheral surface that contacts the electrode layer of the electrode sheet. Electrode sheet inspection device.   11. The battery electrode according to claim 9, wherein a plurality of the first rolls are arranged so that the conductive outer peripheral surface is arranged for each of the inspection regions to be measured in a divided manner. 11. Sheet inspection device.   The battery electrode sheet according to any one of claims 5 to 11, wherein the inspection direction is at least one of a transfer direction of the electrode sheet and a longitudinal direction of the electrode sheet. Inspection equipment.   The inspection apparatus for an electrode sheet for a battery according to any one of claims 5 to 12, wherein the insulating layer is a solid electrolyte layer.

Images