WO2020130184A1 - Secondary battery cell stack manufacturing device - Google Patents

Abstract

A secondary battery cell stack manufacturing device according to an embodiment of the present invention comprises: a lamination table installed to be able to reciprocate in horizontal and vertical directions; a separator supply portion positioned above the lamination table so as to supply a separator onto the lamination table; first multiple heads provided on the upper portion of one side of the lamination table, respectively, such that the position of an electrode plate is aligned with a separator positioned on the lamination table, which has moved to one side thereof, and then laminated therewith one after another; second multiple heads provided on the upper portion of the other side of the lamination table such that the position of an electrode plate is aligned with a separator positioned on the lamination table, which has moved to the other side thereof, and then laminated therewith one after another; and a defect inspection portion provided between the first and second multiple heads so as to take an image of a cell stack laminated on the lamination table each time the lamination table moves between the first and second multiple heads, thereby determining whether or not same is defective on the basis of the cell stack image information.

Description

Cell stack manufacturing device of secondary battery

The present invention relates to a cell stack manufacturing apparatus of a secondary battery capable of manufacturing a cell stack with high speed and high precision.

A secondary battery is a device that converts and stores electrical energy into chemical energy, and then generates electricity when needed. Both charging and discharging occur at one electrode, and an anode (-node) and a cathode (cathode) Silver is distinguished based on the discharge reaction.

The secondary battery includes a positive electrode plate and a negative electrode plate coated with an active material on a current collector, a separator separating the positive electrode plate and the negative electrode plate, an electrolyte solution that transfers ions through the separator, a case accommodating the positive electrode plate, the separator and the negative electrode plate, and a positive electrode plate. And lead tabs connected to the negative electrode plate and drawn out.

Recently, in order to increase the battery capacity of the secondary battery, the method of increasing the number of electrodes or increasing the size of the electrode is required. The cell of the secondary battery has a winding method and a folding method. And, it can be manufactured by a stacking (stacking) method.

In the winding method, a positive electrode plate and a negative electrode plate are placed on a separator and rolled to form a jelly roll. As the positive electrode plate and the negative electrode plate and the separator increase, defects due to misalignment may occur. Is used.

In the folding method, adhesive is applied to both sides of the separator, and a plurality of cut positive and negative plates of a certain size are attached to both sides of the separator at regular intervals, and then folded several times so that the positive and negative plates are alternately arranged. Of course, there is a need for an additional process in which the positive electrode plate and the negative electrode plate are previously cut and attached to the separator.

The stacking method is produced in the form of lamination in which a positive electrode plate or a negative electrode plate is adhered to a separator to a certain size, and then lamination is stacked to form a cell stack in which a positive electrode plate, a separator plate, a negative plate plate, and a separator are alternately inserted. .

Compared to the winding method or the folding method, the stacking method can flexibly control the number of stacked layers and increase the density of the electrode relative to the volume. However, the stacking method has a problem of low productivity and high production cost as a process of separately laminating an electrode body of lamination type is added.

Korean Registered Patent No. 313119 (filed Jan. 26, 1999) discloses a group of electrodes of a secondary battery that is folded in a zigzag state to form a stacked structure in a state where the positive electrode, the negative electrode, and the separator are overlapped.

In the Korean Patent Registration No. 1220981 (filed on Sep. 2010, 2010), supply means for continuously supplying a sheet-shaped separator in the longitudinal direction; Fixing means positioned at a position spaced apart from the supply means along the supply direction of the separator to fix the electrode plate stack formed by alternately stacking the separator and the electrode plate; After contacting the electrode plate on one surface of the separator positioned between the supply means and the fixing means, the electrode plate is moved so that the other surface of the separator in contact with the electrode plate is in contact with the electrode plate stack fixed to the fixing means. Disclosed is an electrode plate stacking device for a secondary battery, comprising: a transfer means for additionally stacking the separator and the electrode plate on the electrode plate stack.

As described above, the Z-stacking method in which the negative electrode plate and the positive electrode plate are alternately stacked while folding the separator in a zigzag manner has been widely used.

Of course, in order to prevent a short circuit, the gap between the negative electrode plate and the positive electrode plate must be kept constant, and after the cell stack is manufactured, the stacking state is checked, and if it is defective, the entire cell stack must be discarded.

However, according to the prior art, even if the cell stack is inspected using a measuring device such as a CT, there is a problem in that the defect rate of the cell stack is high because the position of the electrode plate is not accurately seen by the separator. And, by inspecting the completely manufactured cell stack to determine the electrode plate defect, and the entire cell stack must be discarded, there is a problem that productivity decreases.

In addition, according to the prior art, while the moving means horizontally moves the electrode plate to contact one surface of the separator, the moving means rotates to move the other surface of the separator to the cell stack fixed to the side of the fixing means, periodically during the process. The tension of the separator is variable. Therefore, the production efficiency may be deteriorated because the separation membrane may be torn at the time when the separation membrane is pulled tightly during the process, and the electrode plate cannot be stacked at the exact position of the separation membrane at the time when the separation membrane is loosened during the process. There is a problem difficult to guarantee.

The present invention has been devised to solve the above-described problems of the prior art, and an object thereof is to provide a cell stack manufacturing apparatus of a secondary battery capable of determining and responding to defects during cell stack manufacturing.

In addition, an object of the present invention is to provide an apparatus for manufacturing a cell stack of a secondary battery capable of uniformly maintaining the tension of a separator during cell stack manufacturing.

Cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention for achieving the above object, a stacking table installed to be reciprocated in the horizontal direction and the vertical direction; A separator supply unit positioned on the stacked table and supplying a separator on the stacked table; A first multi head that is provided on one side of the stacked table and stacks one by one by arranging the positions of the electrode plates on the separator located on the stacked table moved to one side; A second multi-head that is provided on the other side of the lamination table and arranges the position of the electrode plate on the separation membrane located on the lamination table moved to the other side to stack one by one; And provided between the first and second multi-heads, each time the stacking table moves between the first and second multi-heads, an image of a cell stack stacked on the stacking table is photographed, and image information of the cell stack is obtained. And a defect inspection unit that determines whether or not the defect is based.

An apparatus for manufacturing a cell stack of a secondary battery according to another embodiment of the present invention includes: a stacking table installed to be reciprocated in a horizontal direction and a vertical direction; A separator supply unit positioned on the stacked table and supplying a separator on the stacked table; A first multi head that is provided on one side of the stacked table and stacks one by one by arranging the positions of the electrode plates on the separator located on the stacked table moved to one side; And a second multi-head (second multi head) is provided on the other side of the stacked table, and stacked one by one by aligning the position of the electrode plate on the separator located on the stacked table moved to the other side; , A plurality of rollers for guiding the separation membrane, and a rotating portion which is located between the rollers and the lamination table, rotates about the center, is installed at both ends of the rotation portion, and guides the separation membrane between the lamination tables from the rollers. It includes a pair of tension adjusting rollers, and the rotating portion is periodically rotated in the forward and reverse directions according to the distance between the lamination table and the rotating portion.

In the cell stack manufacturing apparatus of the secondary battery according to the present invention, while the stacking table moves between the first and second electrode plate supply units, the electrode plates are alternately stacked on the separator, and the stacking table moves between the first and second electrode plate supply units. Each time the defect inspection unit can take an image of the cell stack stacked on the stacking table.

Therefore, during manufacturing of the cell stack, it is possible to quickly and accurately determine whether the defect is based on the image information of the electrode plate stacked on the cell stack, and it is possible to immediately discard the defective cell stack before the cell stack is completed, thereby increasing productivity. In addition, high-speed and high-accuracy cell stacks can be produced.

In addition, the cell stack manufacturing apparatus of the secondary battery according to the present invention, by rotating the rotating bar provided with a pair of tension adjusting rollers for guiding the separation membrane in the forward and reverse directions according to the distance from the stacking table, stacked during cell stack manufacturing Even if the table is moved, the tension of the separator can be maintained uniformly.

Therefore, it is possible to increase the production efficiency by preventing the separator from tearing, and to prevent the electrode plate from being incorrectly stacked on the separator, thereby producing a cell stack with high accuracy.

1 is a front view showing a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing a cell stack manufacturing process of a secondary battery according to an embodiment of the present invention briefly.

3 is a schematic diagram schematically showing a main part of a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

Figure 4 is a front view showing a main portion of a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

5 and 6 is a perspective view showing the main portion of the cell stack manufacturing apparatus of the secondary battery according to an embodiment of the present invention from a different angle.

7 is a plan view showing a multi-head and a vision unit included in a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

8 is a plan view showing a multi-head and a defect inspection unit included in a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention

9 is a side view showing a defect inspection unit included in the cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

10 is a schematic diagram sequentially showing a process in which a separator is supplied through a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

11 is a schematic view sequentially showing the process of stacking electrode plates through a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. However, the scope of the spirit of the invention possessed by the present embodiment may be determined from the information disclosed by the present embodiment, and the spirit of the invention possessed by the present embodiment may be performed by adding, deleting, or changing elements to the proposed embodiment. It will be said to include variations.

1 is a front view illustrating a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention, and FIG. 2 is a schematic diagram schematically showing a cell stack manufacturing process of a secondary battery according to an embodiment of the present invention.

Cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention, as shown in Figure 1, the first electrode plate supply unit 10, the second electrode plate supply unit 20, the separator supply unit 30 and , A stacking unit 100, a thermocompression unit 40, a cutting unit 50, a sealing unit 60, and an unloading unit 70.

The first and second electrode plate supply units 10 and 20 unroll the roll wound around the electrodes and cut them into electrode plates B1 and B2 of a predetermined length, respectively, and stack the electrode plates B1 and B2 one by one into the stacking unit 100. Can supply. Of course, the electrode plates B1 and B2 supplied by the first and second electrode plate supply portions 10 and 20 may be positive electrode plates or negative electrode plates, and the first and second electrode plate supply portions 10 and 20 are alternately stacked. The electrode plates B1 and B2 may be supplied to the unit 100.

The separator supply unit 30 is provided between the first and second electrode plate supply units 10 and 20, and can release the roll wound around the separator A and supply it to the stacking unit 100 with uniform tension.

According to an embodiment, the separator supply unit 30 may be composed of a plurality of rollers and guide units for guiding the separator A, which will be described in detail below.

The stacking unit 100 is provided under the separation membrane supply unit 30, folds the separation membrane A supplied by the separation membrane supply unit 30, and the electrode plates supplied by the first and second electrode plate supply units 10 and 20 ( B1, B2) may be configured to repeat the process of laminating on the separator A.

In addition, the stacking unit 100 can be stacked at the correct position of the separator A by adjusting the position of the electrode plates B1 and B2 before stacking the electrode plates B1 and B2 on the separator A. , If the electrode plates (B1, B2) are stacked beyond the reference position of the separation membrane (A), it is configured to be discarded as a defect, which will be described in detail below.

On the other hand, between the stacking unit 100 and the thermocompression unit 40 and the cutting unit 50 and the sealing unit 60, the separator A between the electrode plates B1, B2 stacked cell stack is a gripper (not shown) City).

The thermocompression unit 40 is provided on one side of the stacking unit 100, and can compress the electrode plates B1 and B2 by simultaneously applying heat and pressure to the cell stack transferred by the gripper.

According to the embodiment, the thermocompression unit 40 includes an upper/lower plate spaced apart in the vertical direction, and at least one of the upper/lower plates is installed to be raised/lowered, and the upper/lower plate is configured to generate heat Can be.

The cutting unit 50 is provided on one side of the thermocompression unit 40 and can cut the separation membrane A of the cell stack compressed by the thermocompression unit 40.

According to an embodiment, the cutting part 50 includes an upper mold and a lower mold, and the upper mold is installed to be able to move up and down by using a sub-motor and a cam, and the cell stack located between the upper and lower molds as they are engaged. The separator can be cut.

At this time, the upper and lower molds are provided with shapes such as punches and strippers on opposite surfaces, so that the separator of the cell stack can be cut into a desired shape.

The sealing part 60 is provided on one side of the cutting part 50, and heat and pressure may be simultaneously applied to the separator A of the cell stack cut by the cutting part 50 to compress the separator A.

When the cell stack device of the secondary battery configured as described above is used, electrode plates B1 and B2 are stacked between the separators A folded in a zigzag manner as shown in FIG. 2, and the cell stack configured as a separator ( C) adheres and fixes the electrode plates B1 and B2 by applying heat and pressure in the up/down direction.

Next, the separator A of the cell stack C is cut into a desired shape, and heat and pressure are applied in the vertical direction of the cell stack C to further compress the separator A, thereby completing the cell stack C.

3 is a schematic diagram schematically showing a main part of a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention, and FIGS. 4 to 6 are main parts of a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention 7 to 8 is a plan view showing a multi-head and a vision unit and a defect inspection unit included in a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention, and FIG. A side view showing a defect inspection unit included in a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

The main part of the cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention includes a first loading part 11, a second loading part 21, a separator supply part 30, and a stacking part 100. The stacking unit 100 includes a stacking table 110, first and second multi-heads 120 and 130, first and second vision units 140 and 150, and first and second defect inspection units 170 and 180. .

The first and second loading units 11 and 21 may be configured to transfer the electrode plates B1 and B2 supplied from the first and second electrode plate supply units 10 and 20 (shown in FIG. 1) one by one. . The first loading part 11 is located on the left side, and the second loading part 21 is located on the right side and may be configured to face each other.

The first and second loading parts 11 and 21 have the suction plates 11a and 21a capable of adsorbing the thin electrode plates B1 and B2 on the lower side, and the suction plates 11a and 21a in the horizontal direction and the vertical direction. It may include a transfer unit (11b, 21b) that can be reciprocated, but is not limited.

The separator supply unit 30 is located between the first and second loading units 11 and 21 and may be configured to supply the separator A with uniform tension.

In detail, the separator supply unit 30 includes a driving roller 31, first and second idle rollers 32a and 32b, a tension roller 33, a guide roller 34, and a rotating unit 35. 1 and 2 tension adjusting rollers 36a and 36b and first to fourth guide parts 37a, 37b, 38a, and 38b may be included, but are not limited thereto.

The driving roller 31 is a portion on which the separator roll on which the separator A is wound is mounted, and is provided on the uppermost side. The first and second idle rollers 32a and 32b are located on one side of the driving roller 31 and are installed at predetermined intervals. The tension roller 33 is positioned below the first and second idler rollers 32a and 32b, and can be adjusted in the tension of the separator A as it is movably installed in the vertical direction.

The rotating part 35 is located under the guide roller 34 on one side of the second idler roller 32b, and can be rotated at a predetermined angle in the forward or reverse direction based on the center. The first and second adjustment rollers 36a and 36b are provided at predetermined intervals on both sides based on the center of the rotating part 35, and the first and second tensions are adjusted as the rotating part 35 is periodically rotated in the forward/reverse direction. The separator A guided by the rollers 36a and 36b can be periodically wound and released. Of course, the operation of the rotating part 35 is interlocked with the movement of the lamination table 110, which will be described in detail below.

The first and second guide parts 37a and 37b are provided side by side at the lower side of the rotating part 35, and the third and fourth guide parts 38a and 38b are provided side by side at the first and second guide parts. The separation membrane A is sandwiched between the portions 37a and 37b and the third and fourth guide portions 38a and 38b so as to be guided to the lamination table 110. The first to fourth guide portions 37a, 37b, 38a, and 38b may be configured in plural, or may be variously configured in the form of rollers.

The stacking table 110 provides a space in which electrode plates are stacked on the separator A. The stacking table 110 includes a horizontal driving unit 111 that reciprocates the stacking table 110 in the horizontal direction between the first and second multi-heads 120 and 130. , It may include a vertical drive unit 112 for reciprocating the stacking table 110 in the vertical direction to the first and second multi-head (120 130).

The stacking table 110 is additionally provided with a jig (J) to fold the separator (A) supplied thereon from left to right, and four jigs (J1 to J2) to hold in the left and right directions. .

When the electrode plate B1 is stacked on the separator A on the stacked table 110 from the left, two jigs J1 and J2 located at the front right and rear of the stacked table 110 press the separator A In the stacking table 110 may be moved in the right direction. In addition, when the electrode plate B2 is stacked on the separator A on the stacking table 110 from the right side, two jigs J3 and J4 located at the front left and right sides of the stacking table 110 press the separator A. In the quasi-state, the stacking table 110 may be moved in the left direction.

By repeating the above process, a cell stack in which the separators A are folded from left to right in the opposite direction and the electrode plates B1 and B2 are stacked between the folded separators A can be made.

The first multi-head 120 is located under the first loading section 11, the electrode plate B1 received from the first loading section 11 is moved to the bottom of the first multi-head 120 stacked table ( 110) It can be fed up.

The first multi-head 120 includes a first adsorption plate 121 capable of vacuum-adsorbing the electrode plate B1, and four first adsorption plates 121 may be provided at upper, lower, left, and right sides. In addition, the first multi-head 120 may include a drive motor (not shown) that sequentially rotates the first suction plate 121 to face the upper side, the left side, the lower side, and the right side.

The first multi-head 120 may correct the position of the first adsorption plate 121 according to the measurement result of the first vision unit 140 to be described below.

According to the embodiment, the first multi-head 120 is based on the Y-axis correction unit 122 for moving the first suction plate 121 in the front-rear direction of the stacked table 110 and the upper surface of the stacked table 110 A θ-axis correction unit 123 for rotating the first adsorption plate 121 with a vertical rotation axis may be included, and the Y-axis correction unit 122 and the θ-axis correction unit 123 may include a first adsorption plate ( 121) may be configured in the form of a sub-motor capable of moving, but is not limited.

Of course, the first multi-head 120 may further include an X-axis correction unit for moving the first adsorption plate 121 in the left-right direction of the stacked table 110, but the position of the stacked table 110 in the left-right direction. It is configured to correct, and the X-axis correction unit can be omitted.

The second multi-head 130 is located under the second loading unit 21, the electrode plate B2 received from the second loading unit 21 is moved to the bottom of the second multi-head 130 stacked table ( 110) It can be fed up.

The second multi-head 130 also includes a second adsorption plate 131, a driving motor (not shown), a Y-axis compensator 132, and a θ-axis compensator 133, like the first multi-head 120. It is configured to include, a detailed description will be omitted. However, the second multi-head 130 is configured to sequentially rotate the second adsorption plate 131 toward the upper side, the right side, the lower side, and the left side, and may be disposed to face the first multi-head as a whole.

The first and second vision parts 140 and 150 are provided to be spaced apart from both sides of the first and second multi-heads 12 and 130, and the positions of the electrode plates B1 and B2 transferred by the first and second multi-heads 120 and 130 Can be aligned.

The first vision unit 140 is a camera installed opposite to the left first adsorption plate 121 of the first multi-head 120, and the electrode plate mounted on the left first adsorption plate 121 of the first multi-head 120. The edge image of (B1) may be photographed, and the edge image of the photographed electrode plate B1 may be corrected according to a reference position.

The first vision unit 140 controls the operation of the Y-axis correction unit 122 and the θ-axis correction unit 123 included in the first multi-head 120 to be stacked by the first multi-head 120 The position of the electrode plate B1 supplied to the table 110 may be aligned.

The second vision unit 150 is a camera installed opposite to the second second adsorption plate 131 on the right side of the second multi-head 130, and the electrode plate mounted on the second second adsorption plate 131 on the right side of the second multi-head 130. The edge image of (B2) may be photographed, and the edge image of the photographed electrode plate B2 may be corrected according to a reference position.

The second vision unit 150 controls the operation of the Y-axis correction unit 132 and the θ-axis correction unit 133 included in the second multi-head 130 to be stacked by the second multi-head 130. The position of the electrode plate B2 supplied to the table 110 may be aligned.

The first and second defect inspection units 160 and 170 are provided side by side between the first and second multi-heads 120 and 130, and the stack of the cell stacks located in the stacked table 110 while the stacked table 110 moves in the left and right directions is defective. Can be judged.

The first defect inspection unit 160 photographs the top surface of the stacking table 110 moving from the first multi-head 120 to the second multi-head 130, that is, from left to right, and the first multi-head 160 It is configured to determine the defect by comparing the edge image information of the electrode plate (B1) supplied from the reference position.

The first defect inspection unit 160 includes a line scan camera 161 capable of continuously photographing the moving lamination table 110 and a reflector reflecting light from the line scan camera 161 toward the upper side of the lamination table 110 ( 162) and the edge image information of the uppermost electrode plate B1 of the cell stack photographed by the line scan camera 161 is compared with a reference position to determine whether it is defective, and control the transfer of the cell stack according to the defect. It may include a control unit 163.

The second defect inspection unit 170 photographs the top surface of the stacking table 110 that is moved from the second multi-head 130 to the first multi-head 120, that is, from right to left, and the second multi-head 130 It is configured to determine the defect by comparing the edge image information of the electrode plate B2 supplied from the reference position, similarly, may include a line scan camera 171 and the reflector 172 and the control unit 173.

The first and second defect inspection units 160 and 170 cumulatively photograph images of the same electrode plates B1 and B2 for each type of electrode plates B1 and B2, and determine whether the electrode plates B1 and B2 are defective by type. Can. The first and second defective inspection units 160 and 170 may be provided in accordance with the types of electrode plates B1 and B2, and the types of electrode plates B1 and B2 are variously divided into cathode, anode, shape, and size. Can be.

10 is a schematic diagram sequentially illustrating a process in which a separator is supplied through a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

As shown in (a), the stacked table 110 is stacked with the electrode plate B1 on the separator A from the left, and then the stacked table 110 is moved from left to center as shown in (b). When the separation membrane A may be loosened, the rotating portion 35 is rotated counterclockwise, and the separation membrane A guided by the first and second tension adjusting rollers 36a and 36b is pulled, and the separation membrane A ) Can keep the tension constant.

As shown in (c), when the stacking table 110 is moved from the center to the right, the separator A may be pulled, the rotating part 35 is rotated clockwise, and the first and second tension adjusting rollers 36a , As the separation membrane A guided by 36b) is released, the tension of the separation membrane A can be kept constant.

As shown in (d), the stacked table 110 is stacked with the electrode plate B2 on the separator A on the right side, and then the stacked table 110 is moved from right to center as shown in (e). When the separation membrane (A) can be loosened, the rotating part (35) is rotated counterclockwise, and the separation membrane (A) guided by the first and second tension control rollers (36a, 36b) is pulled and the separation membrane (A ) Can keep the tension constant.

As shown in (f), when the lamination table 110 is moved from the center to the left, the separator A may be pulled, the rotating part 35 is rotated clockwise, and the first and second tension adjusting rollers 36a , As the separation membrane A guided by 36b) is released, the tension of the separation membrane A can be kept constant.

As described above, the rotating part 35 may be interlocked with the stacking table 110. That is, according to the interval between the stacking table 110 and the rotating part 35, the rotating part 35 periodically rotates a predetermined angle in a clockwise or counterclockwise direction, and even if the laminated table 110 is moved in the left-right direction, the separator ( The tension of A) can be adjusted uniformly.

Therefore, it is possible to increase the production efficiency by preventing the separation membrane A from being torn, and to prevent the electrode plates B1 and B2 from being incorrectly stacked on the separation membrane A to produce a high-accuracy cell stack.

11 is a schematic diagram sequentially showing a process in which electrode plates are stacked through a cell stack manufacturing apparatus of a secondary battery according to an embodiment of the present invention.

As shown in (a), when one electrode plate B1, B2 is adsorbed to the lower side of the loading portions 11, 21, and the loading portions 11, 21 descend to the upper side of the multi-heads 120, 130, As shown in (b), the electrode plates B1 and B2 can be adsorbed on the adsorption plates 121 and 131 located above the multi-heads 120 and 130.

When the multi-heads 120 and 130 are rotated by 90°, as shown in (c), the adsorption plates 121 and 131 on which the electrode plates B1 and B2 are adsorbed face the vision portions 140 and 150 on one side, and the vision portions 140 and 150 A photographs the edge images of the electrode plates B1 and B2 and compares them with the reference position, and then aligns the electrode plates B1 and B2 with the reference position.

In order to align the electrode plates B1 and B2 to a reference position, the adsorption plates 121 and 131 on which the electrode plates B1 and B2 are adsorbed can be moved in the Y-axis direction or rotated in the θ-axis direction, The stacking table 110 on which the electrode plates B1 and B2 are to be stacked may be moved in the X-axis direction.

When the multi-heads 120 and 130 are rotated 90°, the adsorption plates 121 and 131 aligned to the reference position as shown in (d) face the stacking table 110 on the lower side, and a jig J1 is placed on the stacking table 110. ~J4: When the stacked table 110 is raised in a state where the separator A is folded by (shown in FIG. 5), the stacked table 110 separates the electrode plates B1 and B2 separated from the adsorbing plates 121 and 131. A) After receiving and stacking, the stacking table 110 descends as shown in (e).

Since the multi heads 120 and 130 have four adsorption plates 121 and 131, the process of continuously supplying and aligning the electrode plates B1 and B2 can be repeated even if the multi heads 120 and 130 rotate 90°, and the cell stack Can shorten the process time.

As described above, the process is the same in each of the multi-heads 120 and 130 located on the left and right sides as shown in FIG. 3, and the stacked table 110 reciprocates between each of the multi-heads 120 and 130. The fields B1 and B2 are laminated alternately.

When the stacking table 110 reciprocates between each of the multi-heads 120 and 130, the defect inspection units 160 and 170 photograph the edge images of the electrode plates B1 and B2 located on the top side of the stacking table 110, and reference The defect is judged according to the position and the comparison result.

If the cell stack is determined to be defective by the defective inspection units 160 and 170, the process of putting the electrode plates B1 and B2 into the multi-heads 120 and 130 is stopped, and the cell stack determined as defective is cut and then discarded.

On the other hand, if the cell stack is judged to be good in the defect inspection units 160 and 170, the process of stacking the electrode plates B1 and B2 on the lamination table 110 by repeating the electrode plates B1 and B2 in the multi-heads 120 and 130 is repeated. do.

Of course, the stacking unit 100 (shown in FIG. 1) repeats the process of stacking the electrode plates B1 and B2 and determining a defect as described above until the cell stack is completed.

As described above, the cell stack in which all of the electrode plates B1 and B2 are stacked between the separators has a thermocompression unit 40, a cutting unit 50, a sealing unit 60, as shown in FIG. It is manufactured as a finished product of the cell stack while sequentially passing through the unloading unit 70.

Therefore, during cell stack manufacturing, it is possible to quickly and accurately determine whether the cell stack is defective based on image information of the electrode plate stacked on the top of the cell stack, and immediately discard the defective cell stack before the cell stack is completed. It can increase productivity and produce high-speed and high-accuracy cell stacks.

Claims (17)

1. A stacking table installed reciprocally in a horizontal direction and a vertical direction;

   A separator supply unit positioned on the stacked table and supplying a separator on the stacked table;

   A first multi head that is provided on one side of the stacked table and stacks one by one by arranging the positions of the electrode plates on the separator located on the stacked table moved to one side;

   A second multi-head that is provided on the other side of the lamination table and arranges the position of the electrode plate on the separation membrane located on the lamination table moved to the other side to stack one by one; And

   Provided between the first and second multi-heads, each time the stacking table moves between the first and second multi-heads, an image of a cell stack stacked on the stacking table is photographed, and based on image information of the cell stack Defect inspection unit to determine whether the defect; Cell stack manufacturing apparatus of a secondary battery comprising a.
2. According to claim 1,

   A first loading part provided on the first multi-head and supplying one electrode plate to the first multi-head; And

   And a second loading unit provided on the second multi-head and supplying one electrode plate to the second multi-head.
3. According to claim 1,

   The separator supply unit,

   A driving roller on which the separator roll is wound, and

   A pair of idle rollers positioned on one side of the driving roller and guiding a separation membrane released from the driving roller;

   A tension roller installed to be movable between the idle rollers and guiding a separator between the idle rollers,

   A rotating part located at one side of the lower portion of the idle roller and rotating relative to a center;

   A pair of tension adjusting rollers installed at both ends of the rotating part and guiding the separation membranes released from the idle rollers;

   A cell stack manufacturing apparatus for a secondary battery including a pair of guide portions positioned under the tension adjusting rollers and a separation membrane released from the tension adjusting rollers sandwiched therebetween and guided to the lamination table.
4. According to claim 3,

   The rotating part,

   A cell stack manufacturing apparatus of a secondary battery that is periodically rotated in a forward direction and a reverse direction according to an interval between the stacking table and the guide portion.
5. According to claim 4,

   The rotating part,

   When the laminated table is moved in a direction closer to the guide parts, the separator is rotated at a predetermined angle in a direction to pull the separator,

   A cell stack manufacturing apparatus of a secondary battery that is rotated at a predetermined angle in a direction to release a separator when the stacking table is moved in a direction away from the guide parts.
6. According to claim 1,

   The first and second multi-heads,

   A cell stack manufacturing apparatus of a secondary battery including a head rotating the adsorption plate for fixing the electrode plate to face the upper side, one side, the lower side, and the other side.
7. The method of claim 6,

   The head,

   A cell stack manufacturing apparatus for a secondary battery having four adsorption plates on the upper side, one side, and the lower side and the other side.
8. The method of claim 6,

   A first vision unit provided on the outside of the first multi-head and photographing an edge image of the electrode plate fixed to the suction plate when the suction plate faces one side; And

   It includes a second vision unit provided on the outside of the second multi-head, and photographing an edge image of the electrode plate fixed to the adsorbing plate when the adsorbing plate faces one side.

   The first and second multi-heads,

   Cell stack manufacturing apparatus of a secondary battery to correct the position of the adsorption plate by an error value compared to a reference position for stacking the electrode plates based on the edge image information of the electrode plates measured in the first and second vision units.
9. The method of claim 8,

   The first and second multi-heads,

   A Y-axis correction unit for horizontally moving the adsorption plate by an error value in a direction (Y-axis) orthogonal to a direction (X-axis) in which the stacked table is moved based on an upper surface of the stacked table;

   A cell stack manufacturing apparatus of a secondary battery including a θ-axis correction unit that rotates the adsorption plate by an error value in a rotation axis direction (θ-axis) perpendicular to the XY plane.
10. The method of claim 9,

    The laminated table,

    A cell stack manufacturing apparatus of a secondary battery that is moved by an error value in the X-axis direction.
11. The method according to any one of claims 1 to 10,

    The defect inspection unit,

    A line scan camera continuously photographing an edge image of an uppermost electrode plate of a cell stack stacked on the stacked table while the stacked table is being moved;

    A secondary stack cell stack manufacturing apparatus provided between the line scan camera and a path through which the stack table is moved, and including a reflector that illuminates an upper surface of the stack table on the line scan camera.
12. The method of claim 11,

    The defect inspection unit,

    A control unit that determines whether a defect is defective by comparing edge image information of the uppermost electrode plate of the cell stack photographed by the line scan camera with a reference position for stacking the electrode plates, and controls the transfer of the cell stack according to the defect. Cell stack manufacturing apparatus of a secondary battery comprising a.
13. The method of claim 11,

    The control unit,

    A cell stack manufacturing apparatus of a secondary battery that receives a reference position for stacking the electrode plates with a plurality of reference mark coordinates provided on the stacking table.
14. The method of claim 11,

    The defect inspection unit,

    A plurality of types of electrode plates supplied by the first and second multi-heads are provided,

    One defective inspection unit is a cell stack manufacturing apparatus of a secondary battery for cumulatively photographing one type of electrode plate image.
15. A stacking table installed reciprocally in a horizontal direction and a vertical direction;

    A separator supply unit positioned on the stacked table and supplying a separator on the stacked table;

    A first multi head that is provided on one side of the stacked table and stacks one by one by arranging the positions of the electrode plates on the separator located on the stacked table moved to one side; And

    It includes a second multi-head (second multi head) which is provided on the other side of the stacked table, and stacks one by one by aligning the position of the electrode plate on the separator located on the stacked table moved to the other side,

    The separator supply unit,

    A plurality of rollers for guiding the separator,

    A rotating part positioned between the rollers and the lamination table and rotated about a center;

    It is installed at both ends of the rotating portion, and includes a pair of tension adjusting rollers to guide the separator between the lamination table from the rollers,

    The rotating part,

    A cell stack manufacturing apparatus of a secondary battery that is periodically rotated in a forward direction and a reverse direction according to an interval between the stacking table and the rotating part.
16. The method of claim 15,

    The rotating part,

    When the laminated table is moved in a direction closer to the rotating part, it rotates a predetermined angle in a direction to pull the separator,

    A cell stack manufacturing apparatus of a secondary battery that is rotated at a predetermined angle in a direction to release a separator when the stacking table is moved away from the rotating part.
17. The method of claim 15,

    The separator supply unit,

    A driving roller on which the separator roll is wound, and

    A pair of idle rollers positioned on one side of the driving roller and guiding a separation membrane released from the driving roller;

    A tension roller installed to be movable between the idle rollers and guiding a separator between the idle rollers,

    Located on the lower side of the idle rollers and the tension roller, the separation membrane is sandwiched between them and includes a pair of guides to guide the lamination table,

    The rotating part,

    Cell stack manufacturing apparatus of the secondary battery is located between the idle roller and the guide portion.

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