JP2023114653A - Electrode insulation inspection device - Google Patents

Abstract

To provide an inspection device capable of suppressing damages of an electrode in an inspection.SOLUTION: An electrode insulation inspection device 1 is a device for inspecting an insulation state of a coating part 150 in a sheet electrode 100 including: an electrode 110 that comprises a projection part 112 and an exposure part 114; and a coated part 150 that is made of an insulation material and coats the projection part. This electrode insulation inspection device 1 comprises: a pair of first rollers 10; a pair of second rollers 20; an insulation determination part 30; and a control part 40. The pair of first rollers 10 can be moved between a contact position that is contacted to the coated part and a separation part that is separated from the coated part. The control part 40 moves the pair of first rollers 10 to the contact position while the coated part 150 passes between the pair of first rollers 10, and moves the pair of first rollers 10 to the separation position when the coated part 150 does not pass between the pair of first rollers 10.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an electrode insulation inspection device.

For example, Japanese Unexamined Patent Application Publication No. 2020-95887 discloses an inspection device capable of inspecting short circuits in electrodes using rollers that press the electrodes and the solid electrolyte layer.

JP 2020-95887 A

In the inspection apparatus described in Japanese Patent Application Laid-Open No. 2020-95887, when the area to be inspected of the electrodes is discontinuous in the conveying direction, the electrodes are damaged when the roller comes into contact with a portion of the electrodes other than the area to be inspected. There is concern that

An object of the present disclosure is to provide an inspection device capable of suppressing electrode breakage during inspection.

An electrode insulation inspection device according to one aspect of the present disclosure includes an electrode including a protruding portion protruding to one side in one direction and an exposed portion protruding to the other side in the one direction, and an insulating material covering the protruding portion. an electrode insulation inspection device for inspecting an insulation state of the covering portion in a single-wafer electrode having a covering portion to be covered by a pair of first rollers arranged so as to sandwich the covering portion, and sandwiching the exposed portion an insulation determination unit that determines an insulation state of the covering portion based on the voltage between the pair of first rollers and the pair of second rollers; and the pair of first rollers. a controller for controlling the rollers, wherein the pair of first rollers is movable between a contact position in contact with the covering portion and a spaced position away from the covering portion; moves the pair of first rollers to the contact position while the covering portion passes between the pair of first rollers, and moves the pair of rollers when the covering portion does not pass between the pair of first rollers. to the separated position.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide an inspection device capable of suppressing electrode breakage during inspection.

1 is a perspective view schematically showing the configuration of an electrode insulation inspection device according to an embodiment of the present disclosure; FIG. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1; FIG. 4 is a cross-sectional view schematically showing a state in which second electrodes are stacked; It is a figure which shows roughly the structure of one part of an electrode insulation test|inspection apparatus. It is a figure which shows roughly the structure of an insulation determination part. FIG. 4 is a cross-sectional view schematically showing a state in which insulation failure has occurred in the covering portion; FIG. 7 is a cross-sectional view schematically showing a state in which the sheet electrode shown in FIG. 6 is provided with a second electrode; FIG. 4 is a cross-sectional view schematically showing a state in which insulation failure has occurred in the covering portion;

Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

FIG. 1 is a perspective view schematically showing the configuration of an electrode insulation inspection device according to one embodiment of the present disclosure. This electrode insulation inspection device 1 is particularly preferably used, for example, in the manufacturing process of electric storage cells mounted on vehicles.

The electrode insulation inspection apparatus 1 is an apparatus for inspecting the insulation state of a sheet electrode 100 formed in the manufacturing process of a storage cell. Prior to the electrode insulation inspection apparatus 1, first, the configuration of the sheet electrode 100 will be described.

FIG. 2 is a cross-sectional view along line II-II in FIG. As shown in FIG. 2, the sheet electrode 100 has a first electrode 110, a first active material layer 120, a separator 130, a second active material layer 140, and a covering portion 150. .

The first electrode 110 is formed in a thin film shape. In this embodiment, the first electrode 110 is composed of a negative electrode foil. The first electrode 110 is made of copper, for example. As shown in FIG. 1, the first electrode 110 has a protruding portion 112 protruding toward one side in the first direction and an exposed portion 114 protruding toward the other side in the first direction. there is In this embodiment, the dimension of the exposed portion 114 in the second direction perpendicular to both the thickness direction of the first electrode 110 and the first direction is smaller than the dimension of the projecting portion 112 in the same direction.

The first active material layer 120 is provided on the front and back surfaces of the first electrode 110 . The first active material layer 120 is made of a negative electrode active material.

The separator 130 is provided outside the first active material layer 120 in the thickness direction of the sheet electrode 100, that is, in the stacking direction of the first electrode 110 and the first active material layer 120 (vertical direction in FIG. 2).

The second active material layer 140 is provided outside the separator 130 in the stacking direction. The second active material layer 140 is made of a positive electrode active material.

As shown in FIG. 2, the protruding portion 112 of the first electrode 110 extends toward the second active material layer 140 in a direction orthogonal to the stacking direction and toward one side (right side in FIG. 2) in the first direction. It has a shape protruding from the end 141 of the . In this embodiment, the first active material layer 120 and the separator 130 also have protrusions 122 and 132 that protrude from the end 141 of the second active material layer 140 in the same direction as the protrusion 112 .

The covering portion 150 is made of an insulating material (synthetic resin or the like) and covers the projecting portions 112 , 122 , 132 .

After the single-wafer electrode 100 is inspected by the electrode insulation inspection apparatus 1, the second electrode 160 is provided outside the second active material layer 140 in the stacking direction, as shown in FIG. The second electrode 160 is formed in a thin film shape. In this embodiment, the second electrode 160 is composed of positive foil. The second electrode 160 is made of aluminum, for example. The second electrode 160 has a shape that protrudes longer than each protrusion 112 , 122 , 132 in the same direction as the protrusion direction of each protrusion 112 , 122 , 132 . In this embodiment, since the projections 112 , 122 , 132 are covered with the covering part 150 , contact between the first electrode 110 and the second electrode 160 is prevented.

Next, the electrode insulation inspection device 1 will be described. The electrode insulation inspection device 1 includes a pair of first rollers 10, a pair of second rollers 20, an insulation determination section 30, a control section 40, and an urging section 50 (see FIG. 4). .

The pair of first rollers 10 are arranged so as to sandwich the covering portion 150 of the sheet electrode 100 that is conveyed in the conveying direction (the direction indicated by the arrow AR1 in FIG. 1) parallel to the second direction. The pair of first rollers 10 conveys the sheet electrode 100 in the conveying direction while sandwiching the covering portion 150 .

As indicated by arrows AR2 in FIG. 4, the pair of first rollers 10 has a contact position (the position indicated by the solid line in FIG. The position indicated by the two-dot chain line in ) and can be moved between. Movement of the first roller 10 between the contact position and the separation position is performed by, for example, an actuator.

The pair of second rollers 20 are arranged so as to sandwich the exposed portion 114 of the sheet electrode 100 being transported in the transport direction. The pair of second rollers 20 conveys the sheet electrode 100 in the conveying direction while sandwiching the exposed portion 114 . In this embodiment, the dimension of the exposed portion 114 in the second direction is smaller than the dimension of the projecting portion 112 in the same direction. Therefore, in order to prevent a moment when both the first roller 10 and the second roller 20 are not in contact with the first electrode 110, the second rollers 20 are separated from each other in the conveying direction as shown in FIG. It is placed in two places. Therefore, in the electrode insulation inspection apparatus 1 , the exposed portion 114 of the sheet electrode 100 first comes into contact with the second roller 20 . In this embodiment, since the first electrode 110 is formed thin, a mechanism for moving the pair of second rollers 20 in the stacking direction is provided in order to suppress the formation of wrinkles on the exposed portion 114 . preferable.

Each first roller 10 and each second roller 20 has a roller type probe. Each first roller 10 and each second roller 20 is driven by a motor. In order to suppress misalignment of the sheet electrode 100 and the like, the circumferential speed of each first roller 10 and each second roller 20 is set to be the same as the sheet electrode 100 conveying speed.

The insulation determination section 30 determines the insulation state of the covering section 150 based on the voltage between the pair of first rollers 10 and the pair of second rollers 20 . The insulation determination unit 30 has a constant voltage power supply and a data logger (see FIG. 5) connected to the pair of first rollers 10 . A constant voltage power source applies a constant voltage to the sheet electrode 100 via the first roller 10 and the second roller 20 . A data logger monitors the voltage applied to the sheet electrode 100 . Electrical connection between the first roller 10, the constant-voltage power supply, and the data logger is performed by a slip ring or the like.

When the projecting portion 112 is properly insulated by the covering portion 150, almost no current flows through the single wafer electrode 100, as shown in FIG. . On the other hand, for example, as shown in FIG. 6, when a burr 112a is formed on the protruding portion 112 of the first electrode 110, and the burr 112a protrudes from the covering portion 150, resulting in an insulation failure, the resistance A voltage drop occurs across the device, lowering the voltage across the single wafer electrode 100, so the data logger shows a lower value than the applied voltage. The insulation determination section 30 determines the insulation state of the covering section 150 based on this voltage difference.

The controller 40 controls the pair of first rollers 10 . The control section 40 moves the pair of first rollers 10 to the contact position while the covering section 150 passes between the pair of first rollers 10 , and moves the covering section 150 to the contact position when the covering section 150 does not pass between the pair of first rollers 10 . The pair of first rollers 10 is moved to the separated position. More specifically, in a state where the pair of first rollers 10 are positioned at the separated position, the control unit 40 sets the position of the front end of the covering part 150 in the conveying direction to the position where the distance between the pair of first rollers 10 is the shortest. , the pair of first rollers 10 are moved from the separated position to the contact position. On the other hand, in the state where the pair of first rollers 10 are positioned at the contact position, the control unit 40 causes the rear end of the covering portion 150 in the conveying direction to pass through the position where the distance between the pair of first rollers 10 is the shortest. Then, the pair of first rollers 10 is moved from the contact position to the separated position. Note that the position of the covering portion 150 is detected by, for example, a sensor, and the detection signal is sent to the control portion 40 .

The biasing portion 50 biases the pair of first rollers 10 in a direction toward each other.

As described above, the electrode insulation inspection apparatus 1 of the present embodiment can inspect the insulation state of the electrodes based on the value of the current flowing between the first roller 10 and the second roller 20 . Moreover, since the inspection of the insulation state can be performed without stopping the conveyance of the single-wafer electrode 100, a decrease in productivity is suppressed.

Further, the control unit 40 moves the pair of first rollers 10 to the separated position when the covering unit 150 does not pass between the pair of first rollers 10, so that the pair of first rollers 10 is always positioned at the contact position. Breakage of the first electrode 110 is suppressed compared to the case where the protruding portion 112 of the first electrode 110 is in contact with the portion other than the portion covered with the covering portion 150 .

In the manufacturing process of the storage cell, after the second electrode 160 is laminated on the second active material layer 140 as shown in FIG. be. In this case, as shown in FIG. 7, even if the first electrode 110 and the second electrode 160 are not electrically connected when the second electrode 160 is stacked, as shown in FIG. is compressed from both sides in the stacking direction, the first electrode 110 and the second electrode 160 may be electrically connected due to the burr 112a or the like. In the present embodiment, the biasing portion 50 is placed in the state before the second electrode 160 is laminated so that a load corresponding to the compressive load acting on the position of the covering portion 150 after the second electrode 160 is laminated acts on the covering portion 150 . urges the pair of first rollers 10 . Therefore, it is possible to detect in advance, before the second electrode 160 is laminated, the problem of electrical continuity between the first electrode 110 and the second electrode 160 in the process after the second electrode 160 is laminated.

It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

The electrode insulation inspection device in the above embodiment includes an electrode including a protruding portion protruding to one side in one direction and an exposed portion protruding to the other side in the one direction, and a covering portion made of an insulating material and covering the protruding portion. and an electrode insulation inspection device for inspecting the insulation state of the covering portion in a single-wafer electrode having a pair of first rollers arranged to sandwich the covering portion, and a pair of first rollers arranged to sandwich the exposed portion. a pair of second rollers, an insulation determination unit that determines an insulation state of the covering portion based on the voltage between the pair of first rollers and the pair of second rollers, and the pair of first rollers. a control unit, wherein the pair of first rollers are movable between a contact position in contact with the covering portion and a spaced position away from the covering portion; moving the pair of first rollers to the contact position while the covering portion passes between the pair of first rollers; and moving the pair of first rollers when the covering portion does not pass between the pair of first rollers. to the separated position.

In this electrode insulation inspection device, when the insulation state of the covering portion is good, almost no current flows between the first roller and the second roller, and when burrs or the like on the electrode protrude from the covering portion. If there is an insulation failure in the covering portion, a voltage drop occurs due to the current flowing between the first roller and the second roller, so that the insulation state of the electrodes can be inspected.

Further, the controller moves the pair of first rollers to the separated position when the covering portion does not pass between the pair of first rollers, so that when the pair of first rollers are always positioned at the contact position (electrode The electrode is prevented from being damaged as compared with the case where the protruding portion of (1) is also in contact with the portion other than the portion covered with the covering portion).

It should be noted that the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

1 electrode insulation inspection device 10 first roller 20 second roller 30 insulation determination unit 40 control unit 50 biasing unit 100 sheet electrode 110 first electrode 120 first active material layer 130 separator 140 second active material layer, 150 covering portion, 160 second electrode.

Claims (1)

The covering portion of the single-wafer electrode, comprising: an electrode including a projecting portion projecting to one side in one direction and an exposed portion projecting to the other side in the one direction; and a covering portion made of an insulating material and covering the projecting portion. An electrode insulation inspection device for inspecting the insulation state of
a pair of first rollers arranged to sandwich the covering portion;
a pair of second rollers arranged to sandwich the exposed portion;
an insulation determination unit that determines an insulation state of the covering portion based on the voltage between the pair of first rollers and the pair of second rollers;
A control unit that controls the pair of first rollers,
The pair of first rollers is movable between a contact position in contact with the covering portion and a spaced position away from the covering portion,
The control section moves the pair of first rollers to the contact position while the covering section passes between the pair of first rollers, and moves the covering section to the contact position when the covering section does not pass between the pair of first rollers. is an electrode insulation inspection device that moves the pair of first rollers to the spaced position;

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