Battery stack manufacturing device for secondary battery

Abstract

Disclosed is an apparatus for manufacturing a stack of a secondary battery. The device for manufacturing the stack of the secondary battery is characterized in that the tension of the separation membrane is controlled by adjusting the rotation speed of the feed roller. In addition, the device for manufacturing the cell stack of the secondary cell is characterized in that the tension of the separation film is adjusted by adjusting the rotation speed of the feeding roller according to the movement speed and / or the movement position (trajectory) of the guide roller. In addition, the device for manufacturing the cell stack of the secondary cell is characterized in that the tension of the separation film is controlled according to the moving speed and the moving track of the guide roller. The apparatus for manufacturing the stack of the secondary battery includes a separation film supply unit, a tension adjustment unit, and a stack stacking unit. The tension adjusting part is provided with a feeding roller which is rotated by a feeding roller driving part so as to adjust the tension of the separation film.

Description

Technical Field

[0001] The present invention relates to a battery stack manufacturing device for a secondary battery, and more particularly, to a battery stack manufacturing device for a secondary battery capable of maintaining and adjusting the tension of a separator. Background Art

[0002] Secondary batteries are components that convert electrical energy into chemical energy, store it, and generate electricity when needed. They are charged and discharged at one electrode at the same time, and the oxidation electrode (Anode, -pole) and the reduction electrode (Cathode, +pole) are divided based on the discharge reaction.

[0003] A secondary battery includes: an anode plate and a cathode plate with active materials coated on the current collector, a separator that separates the anode plate and the cathode plate, an electrolyte that transmits ions through the separator, a casing that accommodates the anode plate, the separator and the cathode plate, and a lead tap that is connected to the anode plate and the cathode plate and leads to the outside.

[0004] Such a secondary battery is formed by stacking an anode plate, a separator, and a cathode plate in this order and placing them in an electrolyte solution. There are two main methods for manufacturing a cell stack of such a secondary battery.

[0005] In the case of small secondary batteries, a cathode plate and an anode plate are usually arranged on a separator, and the separator is rolled up to form a jelly-roll. In the case of medium-to-large secondary batteries with a larger capacity, a cathode plate, an anode plate and a separator are usually stacked in an appropriate order.

[0006] There are various methods for manufacturing a secondary battery stack in a stacking manner. Among them, the Z-stacking method is stacking in the following form: the separation membrane is formed in a zigzag folded form, and the cathode plate and the anode plate are alternately inserted between them.

[0007] Various prior arts such as Japanese Patent No. 10-2021-0031152 disclose a battery stack of secondary batteries configured in such a Z-stack configuration.

[0008] The above-mentioned Patent Publication No. 10-2021-0031152 discloses a secondary battery stack manufacturing system for manufacturing a cell stack by supplying a separator to a stack table that moves back and forth left and right.

[0009] However, the battery stack manufacturing system for secondary batteries of the above-mentioned patent No. 10-2021-0031152 has difficulty in increasing the production speed of the battery stack due to the weight of the stack that moves back and forth left and right, and there is no component between the separation membrane unwinding machine and the stack that can adjust (control) the tension of the separation membrane, so it is difficult to control the tension of the separation membrane. Summary of the invention

[0010] Technical issues

[0011] An object of the present invention is to provide a secondary battery stack manufacturing apparatus capable of adjusting the tension of a separator membrane, and capable of increasing the production speed of the battery stack by adjusting the tension of the separator membrane.

[0012] Means of solving technical problems

[0013] The above-mentioned object of the present invention is achieved by adjusting the rotation speed of the feed roller rotated by a separately provided drive unit. In addition, it is achieved by the moving speed and moving trajectory of the guide roller. In addition, it is achieved by adjusting the rotation speed of the feed roller according to the moving speed and / or moving position (trajectory) of the guide roller.

[0014] The above-mentioned object of the present invention is achieved by the specific contents described below.

[0015] The battery stack manufacturing device of the secondary battery of the present invention comprises a separation membrane supply unit, a tension adjustment unit and a stacking unit. The separation membrane supply unit supplies the separation membrane. The tension adjustment unit adjusts the tension of the separation membrane moved from the separation membrane supply unit. The stacking unit is arranged below the tension adjustment unit. In addition, the tension adjustment unit is equipped with a feed roller rotated by a feed roller driving unit to adjust the tension of the separation membrane.

[0016] Specifically, the separation membrane supply unit includes a separation membrane unwinder, a plurality of separation membrane travel rollers, and a tension adjustment component. The separation membrane is wound on the separation membrane unwinder. The plurality of separation membrane travel rollers guide the separation membrane unwound from the separation membrane unwinder to the tension adjustment unit. The tension adjustment unit is disposed between the separation membrane unwinder and the tension adjustment unit.

[0017] Specifically, the tension adjustment member includes a plurality of tension adjustment rollers, a first support member, and a second support member. The plurality of tension adjustment rollers rotate by the movement of the separation film. The first support member supports a portion of the plurality of tension adjustment rollers. The second support member supports another portion of the plurality of tension adjustment rollers and is arranged at a predetermined distance from the first support member.

[0018] Specifically, the first supporting member moves or rotates around one side of the first supporting member as a central axis.

[0019] Specifically, the second supporting member moves or rotates around one side of the second supporting member as a central axis.

[0020] Specifically, the first supporting member and the second supporting member are capable of rotating while moving.

[0021] Specifically, the tension adjustment unit includes a feed roller, a feed roller driving unit, and a guide roller. The feed roller is formed into a pair. The feed roller driving unit rotates the pair of feed rollers. The guide roller is arranged between the pair of feed rollers and the stacking unit. The separation membrane moves to the guide roller through the pair of feed rollers.

[0022] Specifically, the guide rollers are formed as a pair and guide the separation membrane passing between the pair of feed rollers to cover the electrode plates sequentially stacked in the stack stacking unit.

[0023] Specifically, the pair of guide rollers reciprocate from the left outermost position to the right outermost position and from the right outermost position to the left outermost position.

[0024] Specifically, the pair of guide rollers reciprocate a distance from the left outermost position of the sections divided into the A section, the B section, and the C section to the right outermost position.

[0025] Specifically, the pair of guide rollers moves from the left outermost contour position to the right outermost contour position, moves upward along an arc-shaped trajectory in the A section, moves horizontally in the B section, and moves downward along an arc-shaped trajectory in the C section. At this time, the pair of guide rollers performs uniform acceleration motion in the A section, uniform speed motion in the B section, and uniform deceleration motion in the C section.

[0026] Specifically, the pair of guide rollers moves from the right outermost contour position to the left outermost contour position and moves upward along an arc-shaped trajectory in the C section, moves horizontally in the B section, and moves downward along an arc-shaped trajectory in the A section. At this time, the pair of guide rollers performs uniform acceleration motion in the C section, uniform speed motion in the B section, and uniform deceleration motion in the A section.

[0027] Specifically, the stacking section includes a battery stack and a stacking platform. The battery stack is structured such that a plurality of electrode plates are stacked with a separation membrane in between. The stacking platform is provided with the battery stack. When one electrode plate is covered with the separation membrane, the stacking platform moves downward.

[0028] According to another embodiment of the present invention, the stack moves downward and upward while one electrode plate is covered with the separation membrane.

[0029] Effects of the Invention

[0030] The secondary battery stack manufacturing apparatus of the present invention has an effect of controlling the tension of the separator film moving from the separator film unwinding machine by the tension adjusting unit.

[0031] In addition, the secondary battery stack manufacturing apparatus of the present invention has an effect of controlling the tension of the separator moving from the separator unwinder to the feed roller by controlling the rotation speed of the feed roller.

[0032] Furthermore, the secondary battery stack manufacturing apparatus of the present invention has an effect of maintaining the tension of the separator by the moving speed and / or moving trajectory of the guide roller after the tension is cut off.

[0033] The secondary battery stack manufacturing apparatus of the present invention has an effect of controlling the tension of the separator by controlling the rotation speed of the feed roller according to the moving speed and / or moving position (trajectory) of the guide roller after the tension is cut off.

[0034] In addition, the battery stack manufacturing apparatus for secondary batteries according to the embodiment of the present invention has the effect of improving the efficiency of battery stack production and reducing defects caused by the generation of wrinkles in the separator, thereby improving the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A secondary battery stack manufacturing apparatus according to an embodiment of the present invention is shown.

[0036] Figure 2 Show Figure 1 Tension adjustment components.

[0037] Figure 3a Show Figure 2 The situation of movement of the supporting parts.

[0038] Figure 3b Show Figure 2 The situation of rotation of the supporting parts.

[0039] Figure 4 Show Figure 1 The tension adjustment unit and the stacking unit.

[0040] Figure 5 Other embodiments of stacked laminations are shown. DETAILED DESCRIPTION

[0041] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Specific descriptions of components of the present invention that can be clearly understood and easily reproduced by a person skilled in the art through conventional techniques will be omitted to avoid obscuring the gist of the present invention.

[0042] The battery stack manufacturing device for secondary batteries described in this specification is a device for manufacturing a battery stack for secondary batteries by Z-stacking. The Z-stacking method is a method for manufacturing a battery stack by folding a long sheet-type separation membrane in a zigzag shape and alternately stacking an anode plate and a cathode plate between the folded separation membranes.

[0043] Next, a secondary battery stack manufacturing apparatus according to an embodiment of the present invention will be described.

[0044] Figure 1 A secondary battery stack manufacturing apparatus according to an embodiment of the present invention is shown.

[0045] Reference Figure 1 The battery stack manufacturing apparatus of the secondary battery according to the embodiment of the present invention includes a separator supply unit 10 , a tension adjustment unit 20 , and a stack lamination unit.

[0046] The separation membrane supply unit 10 supplies the separation membrane 11 to the stacking unit 30 .

[0047] The separation membrane supply unit 10 includes a separation membrane unwinder 12 , a separation membrane travel roller 13 , and a tension adjustment (dancer) unit 14 .

[0048] A long separation membrane 11 is wound on the separation membrane unwinder 12 .

[0049] The separation film unwinder 12 is located on the upper side, left side, or right side of the tension adjusting section 20 and / or the stack laminating section 30 depending on the number of separation film travel rollers 13 .

[0050] The separation film unwinder 12 is rotated by a known driving device, which includes, for example, a driving motor, a speed reducer, a pulley, a belt, etc., and includes various connection members for connecting to the driving device.

[0051] The separation membrane unwound from the separation membrane unwinder 12 moves at the same speed until reaching the feed roller 21 described later. Therefore, the separation membrane 11 is subjected to the same tension from the separation membrane unwinder 12 to the feed roller 21. In other words, the tension of the separation membrane 11 from the separation membrane unwinder 12 to the feed roller 21 is kept constant.

[0052] The driving device of the rotating separation membrane unwinder 12 rotates the separation membrane unwinder 12 at a predetermined speed so that the moving speed of the separation membrane 11 moving from the separation membrane unwinder 12 to the feed roller 21 remains the same. In addition, the feed roller driving unit that rotates the feed roller 21 rotates the feed roller 21 at a predetermined speed.

[0053] On the other hand, the secondary battery stack manufacturing apparatus according to the embodiment of the present invention includes a control unit (not shown).

[0054] The control unit controls the driving device and the feed roller driving unit of the separation membrane unwinding machine 12. The driving device of the separation membrane unwinding machine 12 rotates the separation membrane unwinding machine 12 at a predetermined speed by the control signal of the control unit. In addition, the feed roller driving unit rotates the feed roller 21 at a predetermined speed by the control signal of the control unit.

[0055] The separation membrane running roller 13 guides the separation membrane 11 unwound from the separation membrane unwinder 12 to the tension adjusting unit 20. The separation membrane running roller 13 can prevent the separation membrane 11 from sinking.

[0056] The separation membrane running roller 13 is formed in a rod shape having a predetermined length in one direction and a circular cross section. Here, the predetermined length is formed to be larger than the width of the separation membrane 11 .

[0057] A plurality of separation film travel rollers 13 are arranged from the separation film unwinder 12 to the tension adjustment unit 20 .

[0058] like Figure 1 As shown, one or more separation film travel rollers 13 are arranged between the separation film unwinder 12 and the tension adjusting member 14 , and one or more separation film travel rollers 13 are arranged between the tension adjusting member 14 and the tension adjusting unit 20 .

[0059] A predetermined number of separation membrane travel rollers 13 are arranged on the travel path of the separation membrane 11 so as to guide the separation membrane 11 from the separation membrane unwinder 12 to the tension adjusting unit 20 .

[0060] The separation film traveling roller 13 is rotatably provided (arranged).

[0061] Specifically, the separation membrane running roller 13 is in a state in which it can rotate (idle state), which is a state in which it is not directly or indirectly connected to a specific driving unit (e.g., a motor, etc.). When the separation membrane 11 unwound from the separation membrane unwinder 12 moves in contact with the separation membrane running roller 13 due to the rotation of the separation membrane unwinder 12 and / or the feed roller 21 described later, the separation membrane running roller 13 rotates due to the friction between the separation membrane 11 and the separation membrane 11.

[0062] The tension adjusting member 14 is disposed between the separation membrane unwinding machine 12 and the tension adjusting unit 20 .

[0063] The tension adjusting member 14 adjusts the tension of the separation membrane 11 and adjusts the unwinding speed of the separation membrane unwinding machine 12 .

[0064] In order to adjust the tension of the separation membrane 11 by the tension adjusting member 14 and adjust the unwinding speed of the separation membrane unwinding machine 12 , the tension adjusting member 14 moves or rotates to the left or right direction.

[0065] Figure 2 Show Figure 1 The tension adjusting member 14, Figure 3a Show Figure 2 In the case where the supporting members 142 and 143 move, Figure 3b Show Figure 2 The situation where the supporting parts 142 and 143 rotate.

[0066] Reference Figures 1 to 3a and Figure 3b The tension adjusting member 14 includes a dancer roll 141 that is rotated by the movement of the separation membrane 11 , and support members 142 and 143 that support the dancer roll 141 .

[0067] The dancer roller 141 is formed in a rod shape having a predetermined length in one direction and a circular cross section. Here, the predetermined length is formed to be larger than the width of the separation membrane 11 .

[0068] The dancer roller 141 is supported by support members 142 and 143 .

[0069] The dancer roller 141 is rotatably mounted.

[0070] Specifically, the tension adjustment roller 141 is in a rotatable state (idle state, which is a state in which it is not directly or indirectly connected to a driving unit such as a motor). When the separation membrane 11 moves in contact with the tension adjustment roller 141, the tension adjustment roller 141 rotates due to the friction between the separation membrane 11.

[0071] The supporting members 142 and 143 include a first supporting member 142 and a second supporting member 143 respectively disposed on one side and the other side.

[0072] The first supporting member 142 and the second supporting member 143 are disposed with a predetermined distance therebetween.

[0073] The first supporting member 142 supports a part of the plurality of dancer rollers 141. That is, the first supporting member 142 is rotatably disposed on the plurality of dancer rollers 141.

[0074] The first support members 142 are formed in a pair to rotatably mount the plurality of tension adjustment rollers 141. In other words, the tension adjustment rollers 141 are formed in a rod shape (circular in cross section) having a predetermined length in one direction, and both ends of the tension adjustment rollers 141 are rotatably supported by the pair of first support members 142. Here, both ends of the tension adjustment roller 141 refer to one end and the other end of the tension adjustment roller 141.

[0075] Specifically, one of the pair of first supporting members 142 supports one end portion of the dancer roller 141 , and the other of the pair of first supporting members 142 supports the other end portion of the dancer roller 141 .

[0076] In addition, the second supporting member 143 supports another part of the plurality of dancer rollers 141. That is, the plurality of dancer rollers 141 are rotatably disposed on the second supporting member 143.

[0077] The second support members 143 are formed in a pair so that the plurality of tension adjustment rollers 141 can be rotatably mounted. In other words, the tension adjustment rollers 141 are formed in a rod shape (circular in cross section) having a predetermined length in one direction, and both ends of the tension adjustment rollers 141 are rotatably supported by the pair of second support members 143. Here, both ends of the tension adjustment roller 141 refer to one end and the other end of the tension adjustment roller 141.

[0078] Specifically, one of the pair of second supporting members 143 supports one end portion of the dancer roller 141 , and the other of the pair of second supporting members 143 supports the other end portion of the dancer roller 141 .

[0079] The supporting members 142 and 143 are movable or rotatable. Figure 3a and Figure 3b The second support member 143 is shown in the figure, and the first support member 142 can also move or rotate in the same manner.

[0080] Specifically, the first supporting member 142 and / or the second supporting member 143 moves in the x-axis direction or in the opposite direction of the x-axis direction (see Figure 3a ) or move in the Y-axis direction or the opposite direction of the Y-axis direction. Here, the x-axis and the Y-axis represent axes that are orthogonal to each other.

[0081] Alternatively, the first support member 142 and / or the second support member 143 rotates in the x-axis direction or in the direction opposite to the x-axis direction with respect to the y-axis direction (see Figure 3b ). When the support members 142 and 143 rotate, one end portion of the support members 142 and 143 becomes the central axis of rotation.

[0082] In addition, the first supporting member 142 and / or the second supporting member 143 may rotate while moving. Specifically, the first supporting member 142 and / or the second supporting member 143 may rotate with reference to the Y-axis direction while moving in the x-axis direction or the Y-axis direction.

[0083] The first support member 142 and the second support member 143 can move together. Alternatively, the first support member 142 moves, and the second support member 143 does not move. Alternatively, the first support member 142 does not move, and the second support member 143 moves. Here, moving means moving and / or rotating.

[0084] The supporting members 142 and 143 are provided with a known moving drive device and a known rotating drive device for the above-mentioned movement and rotation. Here, the known moving drive device and rotating drive device include, for example, a driving motor, a speed reducer, a pulley, a conveyor belt, etc., including various connecting parts for connecting with the above-mentioned driving device.

[0085] The separation membrane 11 is alternately wound around a plurality of tension adjustment rollers 141 respectively arranged on the first support member 142 and the second support member 143. Specifically, the separation membrane 11 is wound around the first tension adjustment roller 141 installed on the first support member 142 (or the second support member 143) and then wound around the first tension adjustment roller 141 installed on the second support member 143 (or the first support member 142). And, the separation membrane 11 is wound around the second tension adjustment roller 141 installed on the first support member 142 (or the second support member 143) and then wound around the second tension adjustment roller 141 installed on the second support member 143 (or the first support member 142). That is, the separation membrane 11 passes through the plurality of tension adjustment rollers 141 arranged on the first support member 142 and the second support member 143 in sequence and moves to the tension adjustment unit 20.

[0086] By moving and / or rotating the supporting members 142 and 143 as described above, the tension of the separation membrane 11 can be adjusted, and the unwinding speed of the separation membrane 11 can be adjusted in the separation membrane unwinding machine 12 .

[0087] The separation membrane 11 supplied (moved) from the separation membrane supply unit 10 moves to the tension adjusting unit 20. According to the embodiment of the present invention, the separation membrane 11 moves to the tension adjusting unit 20 via the separation membrane travel roller 13 disposed (installed) between the tension adjusting member 14 and the tension adjusting unit 20.

[0088] Figure 4 express Figure 1 The tension adjusting unit 20 and the stacking unit 30 are provided.

[0089] Reference Figure 4The tension adjustment unit 20 includes a feeder roll 21 , a feeder roll driving unit and a guide roller 22 .

[0090] The tension adjusting unit 20 adjusts the tension of the separation membrane 11 .

[0091] The tension adjusting unit 20 is disposed on one side of the separation membrane supply unit 10 and disposed on a stacking unit 30 described later. Here, the one side of the separation membrane supply unit 10 means the lower side or the side of the separation membrane supply unit 10 .

[0092] The feed roller 21 keeps the tension of the separation membrane 11 supplied (moved) from the separation membrane supply unit 10 constant.

[0093] A pair of feed rollers 21 are provided. The separation membrane 11 passes between the pair of feed rollers 21 and moves to the guide roller 22 .

[0094] One of the pair of feed rollers 21 brings the separation membrane 11 into close contact with the other feed roller 21. Therefore, the separation membrane 11 is in close contact with each of the pair of feed rollers 21. This means that the pair of feed rollers 21 are in close contact with each other with the separation membrane 11 interposed therebetween.

[0095] The pair of feed rollers 21 is rotated by a feed roller driving unit.

[0096] Specifically, one of the pair of feed rollers 21 is rotated by the feed roller driving unit. The separation membrane 11 is formed between the pair of feed rollers 21. When one of the pair of feed rollers 21 is rotated by the feed roller driving unit, the other feed roller 21 is rotated by the friction between the moving separation membrane 11. Therefore, when one of the pair of feed rollers 21 rotates in the clockwise direction (or counterclockwise direction), the other of the pair of feed rollers 21 rotates in the counterclockwise direction (or clockwise direction).

[0097] The moving speed of the separation membrane 11 moving between the pair of feed rollers 21 is the same as the moving speed of the separation membrane 11 moving between the separation membrane unwinder 12 and the feed rollers 21. Therefore, the separation membrane 11 passing between the pair of feed rollers 21 receives the same tension from the separation membrane unwinder 12. In other words, the tension of the separation membrane 11 from the separation membrane unwinder 12 to the feed rollers 21 is kept constant.

[0098] As described above, in order to keep the moving speed of the separation membrane 11 moving from the separation membrane unwinder 12 to the feed roller 21 the same (that is, the tension of the separation membrane 11 from the separation membrane unwinder 12 to the feed roller 21 is kept constant), the feed roller driving unit that rotates the feed roller 21 rotates the feed roller 21 at a predetermined speed. In addition, the driving device that rotates the separation membrane unwinder 12 rotates the separation membrane unwinder 12 at a predetermined speed.

[0099] On the other hand, the tension of the separation membrane 11 passing between the pair of feed rollers 21 is lower than the tension of the separation membrane 11 passing between the pair of feed rollers 21. Therefore, the rotating pair of feed rollers 21 maintains the tension of the separation membrane 11 constant while performing a tension cut function. Here, tension cut means that the tension of the separation membrane 11 before and after passing through the feed rollers 21 is kept different.

[0100] The feed roller driving unit drives (rotates) the feed roller 21. Specifically, the feed roller driving unit rotates the pair of feed rollers 21.

[0101] like Figure 4 As shown, the feed roller driving unit includes a drive motor 211, a pulley 214 connected to the rotating shaft of the drive motor 211 (this is called a 'motor pulley'), a pulley 213 connected to any one of the pair of feed rollers 21 (this is called a 'feed roller pulley'), and a power transmission component 212 (for example, a conveyor belt, a chain) connecting the motor pulley 214 and the feed roller pulley 213.

[0102] When power is supplied to the electric wire connected to the driving motor 211, the driving motor 211 is driven. The driving force (rotational force) of the driving motor 211 is transmitted to the feed roller pulley 213 through the motor pulley 214 and the power transmission component 212. Therefore, any one of the pair of feed rollers 21 provided with the feed roller pulley 213 rotates. The separation membrane 11 disposed between the pair of feed rollers 21 moves as the feed rollers 21 rotate. Thus, the separation membrane 11 unwound from the separation membrane unwinder 12 moves at a predetermined speed to the feed roller 21 (specifically, until it passes between the pair of feed rollers 21), and the tension of the moving separation membrane 11 is kept constant.

[0103] Although not shown in the figure, according to other embodiments of the present invention, the driving motor of the feed roller driving unit is directly connected to any one of the pair of feed rollers 21. Specifically, the rotating shaft of the driving motor is directly connected to the center of any one of the pair of feed rollers 21. For example, a thread (bolt) is formed on the rotating shaft of the driving motor, and the above-mentioned rotating shaft is connected to a screw groove formed in the center of the feed roller 21 (a thread (nut) is formed on the inner surface of the above-mentioned screw groove), so that the driving motor is directly connected to any one of the pair of feed rollers 21. In this embodiment, the driving motor rotates the feed roller 21 without the above-mentioned pulley and power transmission components.

[0104] The feed roller driving unit (specifically, the driving motor) is controlled by a control unit (not shown). The control unit adjusts (controls) the rotation speed of the driving motor 211 constituting the feed roller driving unit. The feed roller driving unit (specifically, the driving motor) rotates the feed roller 21 at a predetermined speed by a control signal from the control unit.

[0105] The guide roller 22 guides the separation membrane 11 that has passed through the feed roller 21 to cover the electrode plates sequentially stacked in the stack stacking unit 30. The electrode plates are an anode plate 311 and a cathode plate 312.

[0106] The guide roller 22 is disposed between the feed roller 21 and the stacking unit 30. Specifically, the guide roller 22 is disposed downwardly at a predetermined distance from the feed roller 21 disposed above. Also, the guide roller 22 is disposed upwardly at a predetermined distance from the stacking unit 30 disposed below.

[0107] The guide roller 22 is rotatably provided (or configured).

[0108] Specifically, the guide roller 22 is in a rotatable state (idle state), which is a state not directly or indirectly connected to a driving unit such as a motor. When the separation membrane 11 passing through the feed roller 21 is guided by the guide roller 22, the guide roller 22 rotates due to the friction between the guide roller 22 and the separation membrane 11.

[0109] The guide rollers 22 are formed as a pair.

[0110] The pair of guide rollers 22 guides the separation membrane 11 and covers the electrode plates stacked in the stacking unit 30. That is, the separation membrane 11 passes between the pair of guide rollers 22 and is guided by the pair of guide rollers 22 to cover the electrode plates.

[0111] The pair of guide rollers 22 moves to fold the separation membrane 11 in a zigzag shape. Specifically, the pair of guide rollers 22 moves along an elliptical trajectory. Here, the elliptical trajectory represents the shape of the movement path of the guide rollers 22.

[0112] Reference Figure 4 The pair of guide rollers 22 reciprocate along an elliptical trajectory from the left outermost position to the right outermost position and from the right outermost position to the left outermost position.

[0113] The pair of guide rollers 22 reciprocate the distance from the left outermost position to the right outermost position of the area divided into the A area, the B area, and the C area. Specifically, the pair of guide rollers 22 sequentially move in the A area, the B area, and the C area, and then sequentially move in the C area, the B area, and the A area. The pair of guide rollers repeatedly perform the above reciprocating movement.

[0114] The left outermost position refers to a position which is spaced a predetermined distance to the left from the left end of the battery panel placed in the stacking unit 30 along the horizontal direction. Figure 4 The A interval in the middle represents the distance interval from the left end of the battery panel along the horizontal direction to the left side outermost position. That is, the distance of the A interval represents the distance from the left end of the battery panel along the horizontal direction to the left side outermost position. The distance of the A interval varies depending on the length of the separation membrane 11 covering the battery panel arranged in the horizontal direction.

[0115] The right outermost position refers to a position which is spaced a predetermined distance to the right from the right end of the battery panel placed in the stacking unit 30 in the horizontal direction. Figure 4 The C section in the middle represents the distance section from the right end of the battery panel along the horizontal direction to the right outermost contour position on the right side. That is, the distance of the C section represents the distance from the right end of the battery panel along the horizontal direction to the right outermost contour position on the right side. The distance of the C section varies depending on the length of the separation membrane 11 covering the battery panel arranged along the horizontal direction.

[0116] on the other hand, Figure 4 The B section is connected to the A section and the C section, and represents the distance section between the A section and the C section. That is, one end of the B section is connected to the A section, and the other end of the B section is connected to the C section. The distance of the B section represents the distance between the A section and the C section along the horizontal direction. This is the same as the length of the battery panel arranged along the horizontal direction in the horizontal direction. Therefore, the distance of the B section varies depending on the length of the battery panel arranged along the horizontal direction in the horizontal direction.

[0117] In order to fold the separation membrane 11 in a zigzag shape, the pair of guide rollers 22 reciprocates along an elliptical trajectory.

[0118] Specifically, the pair of guide rollers 22 moves from the left outermost position to the right outermost position, moves upward along an arc-shaped trajectory in section A, moves horizontally in section B, and moves downward along an arc-shaped trajectory in section C. At this time, the pair of guide rollers 22 perform uniform acceleration motion in section A, uniform speed motion in section B, and uniform deceleration motion in section C.

[0119] Furthermore, the pair of guide rollers 22 moves from the right outermost position to the left outermost position, moves upward along an arc-shaped trajectory in the C section, moves horizontally in the B section, and moves downward along an arc-shaped trajectory in the A section. At this time, the pair of guide rollers 22 perform uniform acceleration motion in the C section, uniform speed motion in the B section, and uniform deceleration motion in the A section.

[0120] As the A section and the C section perform uniform acceleration and uniform deceleration, the production speed of a cell stack 31 (cell stack) described later can be increased, thereby achieving an effect of improving production efficiency.

[0121] The above-mentioned section B is a section where the separation membrane 11 covers the battery panel. As a pair of guide rollers 22 move at a constant speed in the horizontal direction in section B, the separation membrane 11 can cover the battery panel flatly without wrinkles under a certain tension (a small tension).

[0122] The pair of guide rollers 22 draw an elliptical trajectory and move from the left outermost position to the right outermost position. At this time, the separation membrane 11 guided by the pair of guide rollers 22 covers the battery plate (for example, the anode plate 311) conveyed to the stack 32. Next, the pair of guide rollers 22 draw an elliptical trajectory and move from the right outermost position to the left outermost position. At this time, the separation membrane 11 guided by the pair of guide rollers 22 covers the battery plate (for example, the cathode plate 312) conveyed to the stack 32.

[0123] As the pair of guide rollers 22 repeatedly reciprocate as described above, the anode plate 311 and the cathode plate 312 are stacked with the separator 11 in between. As the anode plate 311 and the cathode plate 312 are stacked with the separator 11 in between, the battery stack 31 described below is formed.

[0124] After the separation membrane 11 passes through the feed roller 21, the tension of the separation membrane 11 is smaller than the tension of the separation membrane 11 before the separation membrane 11 passes through the feed roller 21. Therefore, the separation membrane 11 that has passed through the feed roller 21 is in a state of reduced tension (a state in which the separation membrane 11 is unwound from the feed roller 21). In this state, the separation membrane 11 is unwound by a predetermined length or during unwound, the guide roller 22 moves from the left outermost position to the right outermost position along an elliptical trajectory, and the separation membrane 11 is guided by the guide roller 22 to cover the anode plate 311 (or cathode plate 312) conveyed to the stack 32. Next, when the separation membrane 11 is unwound again by a predetermined length or during unwound, the guide roller 22 moves from the right outermost position to the left outermost position along an elliptical trajectory, and the separation membrane 11 is guided by the guide roller 22 to cover the cathode plate 312 or the anode plate 311 conveyed to the stack 32. Here, the predetermined length of the separation film 11 that has passed through the feed roll 21 (that is, the separation film 11 that has been unwound from the feed roll 21 ) differs depending on the horizontal length of the battery panel that is arranged in the horizontal direction.

[0125] As the pair of guide rollers 22 moves along the above-mentioned elliptical trajectory, the separation film 11 that has passed through the feed roller 21 (the separation film 11 that has been unwound from the feed roller 21) passes through the pair of guide rollers 22 while covering the battery panel with a certain tension. Here, the certain tension has a low value. As a result, the separation film 11 is evenly covered on the battery panel without wrinkles.

[0126] The secondary battery stack manufacturing apparatus of the embodiment of the present invention includes a fixing member (not shown) that presses down the outer surface of one side of the electrode plate to fix (hold) the electrode plate each time the separator 11 covers the electrode plate in a zigzag shape.

[0127] The fixing member plays the following role: when the stacked battery plates are covered by the separation membrane 11, for example, one side of the electrode plate covering the separation membrane 11 is pressed down and fixed, so that the separation membrane 11 is guided by the guide roller 22 to cover the electrode plate and fix the electrode plate to prevent it from moving.

[0128] When the pair of guide rollers 22 moves from the left outermost position to the right outermost position, and when moving from the A section and from the right outermost position to the left outermost position, the pair of guide rollers 22 moves upward along an arc-shaped trajectory in the C section, so that the pair of guide rollers 22 can avoid the above-mentioned fixing components. In addition, as the pair of guide rollers 22 lift the separation membrane 11 upward and move in the horizontal direction, the separation membrane 11 unwound from the feed roller 21 is unfolded flatly without wrinkles.

[0129] For the above-mentioned reciprocating movement, the pair of guide rollers 22 is provided with a known moving driving device. Here, the known moving driving device includes, for example, a driving motor, a speed reducer, a pulley, a conveyor belt, etc., including various connection components for connecting with the above-mentioned driving device.

[0130] The stacking unit 30 includes a cell stack 31 and a stack table 32 .

[0131] The battery stack 31 is stacked on the stack stacking unit 30 .

[0132] The stacking unit 30 is disposed below the tension adjusting unit 20 .

[0133] The battery stack 31 has a structure in which a plurality of electrode plates are stacked with a separator 11 interposed therebetween. Here, the electrode plates refer to an anode plate 311 and a cathode plate 312.

[0134] Specifically, the battery stack 31 has, for example, a structure in which anode plates 311 are stacked, a separation membrane 11 is covered on the anode plates 311, a cathode plate 312 is stacked on the separation membrane 11, and a separation membrane 11 is covered on the cathode plate 312. That is, the battery stack 31 has a structure in which the anode plates 311 and the cathode plates 312 are alternately stacked with the separation membrane 11 in between.

[0135] As described above, the cell stack 31 is formed by repeatedly guiding the separator 11 unwound from the feed roller 21 onto the cell plate as the pair of guide rollers 22 repeatedly reciprocate.

[0136] The battery stack 31 is manufactured on the stacking table 32 .

[0137] The stack 32 may not move. In other words, the stack 32 may not move while the pair of guide rollers 22 repeatedly reciprocate to manufacture the battery stack 31 .

[0138] In addition, the stack 32 moves downward and upward.

[0139] When one electrode plate is covered by the separation membrane 11, the stack 32 moves downward. Specifically, when one electrode plate transferred to the stack 32 is covered by the separation membrane 11, the stack 32 moves downward by a predetermined length. Here, the predetermined length means the length obtained by adding the thickness of the separation membrane 11 and the thickness of the electrode plate. Thus, the distance between the battery plates transferred from the feed roller 21 to the stack 32 is kept constant.

[0140] When one battery stack 31 manufactured on the stack 32 is removed (in other words, transferred to another location), the stack 32 moves upward to receive the electrode plates constituting the other battery stack 31. Thus, the distance between the battery plates transferred from the feed roller 21 to the stack 32 is kept constant.

[0141] Although not shown in the figure, the battery stack manufacturing device of the secondary battery of the embodiment of the present invention comprises: an anode plate supply unit, which is arranged on one side of the stack 32 and conveys (moves) the anode plate 311 onto the stack 32; and a cathode plate supply unit, which is arranged on the other side of the stack 32 and conveys (moves) the cathode plate 312 onto the stack 32.

[0142] The anode plate supply unit and the cathode plate supply unit continuously supply the anode plate 311 and the cathode plate 312 to the stack 32 .

[0143] The anode plate supply unit and the cathode plate supply unit include a known moving drive device and various connection members in order to move the anode plate 311 and the cathode plate 312 .

[0144] As described above, the stack 32 may not move while the guide roller 22 repeatedly reciprocates. However, according to another embodiment of the present invention, the stack 32 may move in a certain form (track).

[0145] According to another embodiment of the present invention, the stack 32 moves downward and upward. Specifically, the stack 32 moves downward and upward while one electrode plate is covered by the separation membrane 11 . Figure 5 Other embodiments of the stack 30 are shown.

[0146] Reference Figure 5 When the pair of guide rollers 22 moves between the left outermost position and the right outermost position, the stack 32 moves downward by a predetermined distance from the first position to the second position and then moves upward by a predetermined distance in order to keep the tension of the separation membrane 11 constant. When the pair of guide rollers 22 is located at (or reaches) the left outermost position and the right outermost position, the stack 32 is located at the first position.

[0147] The downward movement and the upward movement of the pair of guide rollers 22 are continuously performed every time the electrode plates are stacked.

[0148] The moving paths of the pair of guide rollers 22 and the stack 32 are described below by way of example.

[0149] When the pair of guide rollers 22 are located at the left outermost position, the stack 32 is located at the first position. When the pair of guide rollers 22 start from the left outermost position, the stack 32 starts to move to the second position. When the pair of guide rollers 22 reach the middle part between the left outermost position and the right outermost position, the stack 32 reaches the second position. When the pair of guide rollers 22 pass the middle part, the stack 32 starts to move to the first position again. And when the pair of guide rollers 22 reach the right outermost position, the stack 32 is located at the first position. Here, the second position refers to a position spaced a predetermined distance downward from the first position.

[0150] Furthermore, when the pair of guide rollers 22 start from the right outermost position, the stack 32 starts to move to the second position, and when the pair of guide rollers 22 reach the middle part between the right outermost position and the left outermost position, the stack 32 reaches the second position, and when the pair of guide rollers 22 pass the middle part, the stack 32 starts to move to the first position again. Furthermore, when the pair of guide rollers 22 reach the left outermost position, the stack 32 is located at the first position.

[0151] The downward movement and upward movement of the pair of guide rollers 22 are continuously performed each time the electrode plates are stacked.

[0152] As described above, in the secondary battery stack manufacturing apparatus according to the embodiment of the present invention, the tension of the separator 11 moving from the separator unwinder 12 is controlled by the tension adjusting unit 20 .

[0153] Specifically, the secondary battery stack manufacturing apparatus of the present invention adjusts (controls) the rotation speed of the feed roller 21 to adjust (control) the tension of the separation membrane 11 from the separation membrane unwinder 12 to the feed roller 21 .

[0154] Specifically, the battery stack manufacturing apparatus for a secondary battery of the present invention maintains the tension of the separator 11 by adjusting the moving speed and / or moving trajectory of the guide roller 22 after the tension is cut off.

[0155] Specifically, the secondary battery stack manufacturing apparatus of the present invention adjusts (controls) the tension of the separation membrane 11 by adjusting (controlling) the rotation speed of the feed roller 21 according to the moving speed and / or moving position (trajectory) of the guide roller 22 after the tension is cut off.

[0156] The secondary battery stack manufacturing apparatus according to the embodiment of the present invention adjusts (controls) the tension of the separator 11, thereby improving the efficiency of producing the battery stack 31 and reducing defects caused by wrinkles of the separator, thereby improving product reliability.

[0157] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, and the present invention need not necessarily be limited to one embodiment. Furthermore, those skilled in the art may combine or modify the features, structures, effects, etc. illustrated in each embodiment in other embodiments and implement them. Therefore, the contents related to such combinations and modifications are included in the scope of the present invention.

[0158] In addition, the above description is centered on the implementation mode, but this is only an example, and the present invention is not limited thereto. Those skilled in the art can make various modifications and applications not shown above within the scope of the essential characteristics of the present embodiment. That is, each component specifically shown in the embodiment can be modified and implemented. And the differences related to such modifications and applications are included in the scope of the present invention specified in the claims.

[0159] (Explanation of symbols)

[0160] 10: Separation membrane supply unit

[0161] 11: Separation membrane

[0162] 12: Separation film unwinding machine

[0163] 13: Separation film travel roller

[0164] 14: Tension adjustment unit

[0165] 141: tension adjustment roller

[0166] 142: First supporting member

[0167] 143: Second supporting member

[0168] 20: Tension adjustment unit

[0169] 21: Feeding roller

[0170] 211: Motor

[0171] 212: Power transmission components

[0172] 213: Feed roller pulley

[0173] 214: Motor pulley

[0174] 22: Guide roller

[0175] 30: Stacking part

[0176] 31: Battery stack

[0177] 311: Anode plate

[0178] 312: Cathode plate

[0179] 32: Stacking platform

Claims

1. A battery stack manufacturing device for a secondary battery, comprising: a separation membrane supply unit that supplies the separation membrane; a tension adjusting section for adjusting the tension of the separation membrane moved from the separation membrane supply section; and a stacking unit, which is arranged below the tension adjusting unit, The tension adjustment unit includes a feed roller rotated by a feed roller driving unit to adjust the tension of the separation membrane.

2. The battery stack manufacturing device for a secondary battery according to claim 1, wherein: The separation membrane supply unit includes: a separation membrane unwinder on which the separation membrane is wound; a plurality of separation film running rollers for guiding the separation film unwound from the separation film unwinder to the tension adjusting section; and A tension adjusting member is disposed between the separation membrane unwinding machine and the tension adjusting section.

3. The battery stack manufacturing device for a secondary battery according to claim 2, wherein: The tension adjustment component includes: a plurality of tension adjustment rollers which are rotated by the movement of the separation film; a first supporting member that supports a portion of the plurality of dancer rollers; and The second supporting member supports another part of the plurality of dancer rollers and is disposed at a predetermined distance from the first supporting member.

4. The battery stack manufacturing device for a secondary battery according to claim 3, wherein: The first supporting member moves or rotates around one side of the first supporting member as a central axis.

5. The battery stack manufacturing device for a secondary battery according to claim 3, wherein: The second supporting member moves or rotates around one side of the second supporting member as a central axis.

6. The battery stack manufacturing device for a secondary battery according to claim 3, wherein: The first supporting member and the second supporting member are capable of rotating while moving.

7. The battery stack manufacturing device for a secondary battery according to claim 1, wherein: The tension adjustment unit includes: a pair of the above-mentioned feed rollers; The feed roller driving unit rotates the pair of feed rollers; and a guide roller disposed between the pair of feed rollers and the stacking unit, The separation membrane passes between the pair of feed rollers and moves toward the guide roller.

8. The battery stack manufacturing device for a secondary battery according to claim 7, wherein: The guide rollers are formed as a pair and guide the separation membrane that has passed between the pair of feed rollers to cover the electrode plates sequentially stacked in the stack stacking section.

9. The battery stack manufacturing device for a secondary battery according to claim 8, wherein: The pair of guide rollers reciprocate from the left outermost position to the right outermost position and from the right outermost position to the left outermost position.

10. The battery stack manufacturing device for a secondary battery according to claim 9, wherein: The pair of guide rollers reciprocate a distance from the left outermost position of the sections divided into the A section, the B section, and the C section to the right outermost position.

11. The battery stack manufacturing device for a secondary battery according to claim 10, wherein: The pair of guide rollers moves from the left outermost position to the right outermost position, moves upward along an arc-shaped trajectory in the A section, moves horizontally in the B section, and moves downward along an arc-shaped trajectory in the C section.

12. The battery stack manufacturing device for a secondary battery according to claim 11, wherein: The pair of guide rollers perform uniform acceleration motion in the A section, uniform speed motion in the B section, and uniform deceleration motion in the C section.

13. The battery stack manufacturing device for a secondary battery according to claim 10, wherein: The pair of guide rollers moves from the right outermost position to the left outermost position, moves upward along an arc-shaped trajectory in the C section, moves horizontally in the B section, and moves downward along an arc-shaped trajectory in the A section.

14. The battery stack manufacturing device for a secondary battery according to claim 13, wherein: The pair of guide rollers perform uniform acceleration motion in the C section, uniform speed motion in the B section, and uniform deceleration motion in the A section.

15. The battery stack manufacturing device for a secondary battery according to claim 1, wherein: The stacking section comprises: A battery stack, in which a plurality of electrode plates are stacked with the separation membranes interposed therebetween; and a stacking platform, on which the battery stack is arranged, When one electrode plate is covered with the separation membrane, the stack moves downward.

16. The battery stack manufacturing device for a secondary battery according to claim 1, wherein: The stacking section comprises: A battery stack, wherein a plurality of electrode plates are stacked on the battery stack with the separation membranes interposed therebetween; and A stack platform, on which the battery stack is arranged.

17. The battery stack manufacturing device for a secondary battery according to claim 16, wherein: While one electrode plate is covered by the separation membrane, the stack moves downward and upward.

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