WO2018004185A1 - Stacking device for secondary battery, stacking method using same, and secondary battery obtained thereby - Google Patents

Abstract

Various embodiments of the present invention provide a stacking device for a secondary battery configured to stack electrode plates at a high rate, a stacking method using the same, and a secondary battery obtained thereby. As an example, disclosed are a stacking device for a secondary battery, a stacking method using the same, and a secondary battery obtained thereby, the stacking device comprising: a first electrode plate bonded body supply portion for supplying a first electrode plate bonded body comprising a first electrode plate, which comprises a first electrode first coating portion and a first electrode second coating portion positioned to be spaced from the first electrode first coating portion, and separators stacked on both surfaces of the first electrode plate; a second electrode plate supply portion for arranging a second electrode first coating portion and a second electrode second coating portion of a second electrode on both surfaces of the first electrode first coating portion of the first electrode plate bonded body, respectively, thereby forming a unit cell; and a folding portion for folding the first electrode plate bonded body, which has the unit cell formed thereon, such that the second electrode first coating portion or the second electrode second coating portion of the second electrode plate faces the first electrode second coating portion of the first electrode plate, thereby forming a stack.

Description

Stacking device for secondary batteries, stacking method using same and secondary battery accordingly

Various embodiments of the present invention relate to a stacking device for a secondary battery, a stacking method using the same, and a secondary battery accordingly.

In general, a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged. In the case of a low-capacity battery in which one battery cell is packed in a pack form, a secondary battery is used in portable electronic devices such as mobile phones and camcorders. Large capacity batteries with dozens of cells connected are used as motor power sources for electric bicycles, electric scooters, hybrid cars, and electric cars.

The secondary battery is configured to accommodate an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator are sequentially stacked together with an electrolyte solution or a solid electrolyte in a case. Such an electrode assembly has a jelly-rool type (winding type) electrode assembly having a structure in which a long sheet-shaped positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, and a plurality of positive electrode plates and negative electrode plates with a separator interposed therebetween. It can be divided into stack (stacked) electrode assembly sequentially stacked in the (stacked) form. Jellyroll type electrode assemblies are mainly used for small secondary batteries, and stack type electrode assemblies are used for medium and large secondary batteries with more electric capacity.

Various embodiments of the present invention provide a stacking device for a secondary battery stacking an electrode plate at a high speed, a stacking method using the same, and a secondary battery according thereto.

According to various embodiments of the present disclosure, a stacking device for a secondary battery includes a first electrode plate and a first electrode including a first electrode first coating part and a first electrode second coating part spaced apart from the first electrode first coating part. A first electrode plate assembly supply unit for supplying a first electrode plate assembly in which separators are stacked on both surfaces of the first electrode plate; A second electrode plate supply unit which forms a unit cell by disposing a second electrode first coating portion and a second electrode second coating portion of the second electrode plate on both surfaces of the first electrode plate assembly, respectively. ; And folding the first electrode plate assembly in which the unit cell is formed, so that the second electrode first coating portion or the second electrode second coating portion of the second electrode plate is the first electrode second of the first electrode plate. And a folding portion that faces the coating portion to form a stack.

A first electrode plate supply unit supplying the first electrode plate to the first electrode plate assembly supply unit; And a separator supply unit configured to supply the separators to the first electrode plate assembly supply unit, wherein the first electrode plate assembly supply unit may arrange and stack the first electrode plate and the separators.

The first electrode plate of the first electrode plate assembly may be supplied in a continuous form, and the second electrode plate may be cut to a predetermined length and disposed on both sides of the first electrode plate assembly.

The first electrode plate may be cut to a predetermined length and supplied in an independent form, and the second electrode plate may be cut to a predetermined length and disposed on both sides of the first electrode plate assembly.

Among the separators positioned on both surfaces of the first electrode plate, the separator junction part may further include a separator junction portion that joins the region of the separator corresponding to the circumferential area of the first electrode plate.

The folding unit includes a gripper for pressing the second electrode plate disposed on both surfaces of the first electrode plate assembly to fix the first electrode plate assembly to the first electrode plate assembly, and to be fixed to the unit cell to fold the first electrode plate assembly. can do.

The folding unit may include a first folding unit and a second folding unit, and the first folding unit and the second folding unit may form the cell stack by folding the first electrode plate assembly in which the unit cells are alternately formed.

The folding unit may further include a fixing unit configured to press and fix the cell stack in a folding operation.

In the first electrode plate, an active material in a region forming a curved portion of the cell stack may be removed.

According to various embodiments of the present disclosure, a stacking method for a secondary battery includes a first electrode plate and a first electrode including a first electrode first coating part and a first electrode second coating part spaced apart from the first electrode first coating part. A first electrode plate assembly supplying step of supplying a first electrode plate assembly in which separators are stacked on both surfaces of the first electrode plate; Supplying a second electrode plate to form a unit cell by disposing the second electrode first coating portion and the second electrode second coating portion of the second electrode plate on both surfaces of the first electrode plate assembly of the first electrode plate assembly step; And folding the first electrode plate assembly in which the unit cell is formed, so that the second electrode first coating portion or the second electrode second coating portion of the second electrode plate is the first electrode second of the first electrode plate. And folding to face the coating to form the cell stack.

The first electrode plate assembly supplying step may include a first electrode plate supplying step of supplying the first electrode plate; A separator supplying step of supplying separators to both surfaces of the first electrode plate; And forming a first electrode plate assembly by stacking separators supplied on both sides of the first electrode plate to form a first electrode plate assembly.

In the supplying of the first electrode plate assembly, the first electrode plate is supplied in a continuous form, and in the supplying of the second electrode plate, the second electrode plate is cut to a predetermined length so that both surfaces of the first electrode plate assembly are provided. Can be placed in.

In the supplying of the first electrode plate assembly, the first electrode plate is cut into a predetermined length and supplied in an independent form. In the supplying of the second electrode plate, the second electrode plate is cut into a predetermined length and the first electrode plate is cut. It may be disposed on both sides of the electrode plate assembly.

After the supplying of the first electrode plate assembly, a separator bonding step of bonding the region of the separator corresponding to the circumferential region of the first electrode plate among the separators located on both sides of the first electrode plate may further include. have.

The first electrode plate of the first electrode plate supplying step may remove an active material in a region forming a curved portion of the cell stack.

A secondary battery according to various embodiments of the present disclosure may include a first coating part of a first electrode plate; A first electrode plate second coating part; Separators surrounding the first electrode plate first coating part and the first electrode plate second coating part at upper and lower parts thereof; A second electrode plate first coating part stacked to face the first electrode plate first coating part; And a first folding area in which the first electrode plate between the first coating part and the first electrode plate second coating part is folded in a first direction, and wherein the first electrode plate second coating part is folded. The electrode plate is laminated facing the first coating portion.

The separator may further include a first junction region formed by bonding the separators between the first electrode plate first coating part and the first electrode plate second coating part.

The second electrode plate may further include a second coating part stacked to face the second electrode coating part.

The first electrode plate may further include a third coating part stacked to face the second electrode plate second coating part, and the first electrode plate may be disposed between the second coating part and the first electrode plate third coating part. The display device may further include a second folding area folded in two directions, and the folded first electrode plate third coating part may be stacked to face the second electrode plate second coating part.

The separator may further include a second junction region formed by bonding the separators between the first electrode plate second coating part and the first electrode plate third coating part to each other.

The first direction and the second direction may be different directions.

The second electrode plate may further include a third coating part stacked to face the third electrode coating part.

According to various embodiments of the present disclosure, a first electrode plate assembly including a separator stacked on a bottom surface and an upper surface of the first electrode plate may be used, and the folding unit may be used in a state in which the second electrode plate is disposed on the bottom surface and the top surface of the assembly, respectively. The present invention provides a stacking apparatus for a secondary battery, a stacking method using the same, and a secondary battery, which can stack four electrode plates in a single folding operation without changing a substrate or adding a method.

In addition, according to various embodiments of the present disclosure, the first electrode plate and the second electrode plate which are individually cut may be supplied, and in particular, the peripheral region of the first electrode plate may be selected from the separators located on both sides of the first electrode plate. By bonding the regions of the corresponding separators, the first electrode plate does not flow between the two separators, thereby providing a stack device for a secondary battery having excellent safety and reliability, a stacking method using the same, and a secondary battery accordingly.

1 is a perspective view of a stack device for a secondary battery according to various embodiments of the present disclosure.

FIG. 2 is an enlarged view of portion A of FIG. 1.

3 illustrates a first electrode plate of a stack device for a secondary battery according to various embodiments of the present disclosure.

4A to 4H sequentially illustrate folding operations of the stack device for a secondary battery according to various embodiments of the present disclosure.

5A is a flowchart illustrating a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure.

5B is a flowchart of a first electrode plate assembly supplying step of a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure.

6A and 6B are plan and side views of a stack device for a secondary battery according to various embodiments of the present disclosure.

7A to 7F sequentially illustrate folding operations of the stack device for a secondary battery according to various embodiments of the present disclosure.

8 is a flowchart illustrating a first electrode plate assembly supplying step of a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure.

9 is a schematic view illustrating a rechargeable battery according to various embodiments of the present disclosure.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Various embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following various embodiments may be modified in various other forms, and the scope of the present invention. Is not limited to the following various examples. Rather, these various embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, the same reference numerals in the drawings refer to the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. In addition, the term "connected" in this specification means not only the case where the A member and the B member are directly connected, but also the case where the A member and the B member are indirectly connected by interposing the C member between the A member and the B member. do.

The terminology used herein is for the purpose of describing particular various embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. Also, as used herein, "comprise, include" and / or "comprising, including" means that the features, numbers, steps, actions, members, elements, and / or groups thereof mentioned. It is intended to specify the existence and not to exclude the presence or addition of one or more other shapes, numbers, operations, members, elements and / or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers, and / or parts, these members, parts, regions, layers, and / or parts are defined by these terms. It is obvious that not. These terms are only used to distinguish one member, part, region, layer or portion from another region, layer or portion. Accordingly, the first member, part, region, layer or portion, which will be described below, may refer to the second member, component, region, layer or portion without departing from the teachings of the present invention.

Terms relating to spaces such as "beneath", "below", "lower", "above", and "upper" are associated with one element or feature shown in the figures. It can be used for easy understanding of other elements or features. Terms related to this space are for easy understanding of the present invention according to various process conditions or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature in the figures is inverted, the element or feature described as "bottom" or "bottom" will be "top" or "top". Thus, "bottom" is a concept encompassing "top" or "bottom".

In addition, in the specification, the first electrode plate may include a first electrode first coating part or a first electrode plate first coating part, a first electrode second coating part, or a first electrode plate second coating part, and a first electrode third coating part. Alternatively, the first electrode plate may be referred to as a third coating part. Further, in the specification, the second electrode plate may include a second electrode first coating part or a second electrode plate first coating part, a second electrode second coating part, or a second electrode plate second coating part, and a second electrode third coating part. Alternatively, the second electrode plate may be referred to as a third coating part.

Further, in the specification, a first electrode (plate) first coating part is interposed between the second electrode (plate) first coating part and the second electrode (plate) second coating part, or the second electrode (plate) first coating The first electrode (plate) and the second coating portion may be interposed between the portion and the second electrode (plate) second coating portion. The positional relationship between the first and second electrode plates may be interpreted as described in the specification and / or drawings, or may be modified and interpreted.

1 is a perspective view of a stack device for a secondary battery according to various embodiments of the present disclosure. FIG. 2 is an enlarged view of portion A of FIG. 1. 3 illustrates a first electrode plate of a stack device for a secondary battery according to various embodiments of the present disclosure.

As shown in FIG. 1, the stack apparatus 100 for a secondary battery according to an exemplary embodiment of the present invention may include a first electrode plate supply unit 110, a first separator supply unit 120, a second separator supply unit 130, and a first electrode. The plate assembly supply part 140, the second electrode plate supply part 150, the stack part 160, the folding part 170, and the fixing part 180 are included.

 The first electrode plate supply unit 110 may include a first electrode plate supply roll. The first electrode plate 10 is wound around the first electrode plate supply roll. In addition, as the first electrode plate supply roll rotates, the first electrode plate 10 is unwound and supplied to the first electrode plate supply unit 140. Therefore, the first electrode plate 10 is supplied in a continuous form.

In addition, the first electrode plate 10 may function as an anode or a cathode. In addition, the active material layer may be formed on both surfaces of the first electrode plate 10 according to its polarity.

As shown in FIGS. 2 and 3, the first electrode plate 10 is supplied in a continuous form, thereby forming a bent portion ① of the cell stack 70. The active material layers on both sides of the portions constituting the bent portion ① of the first electrode plate 10 may be dropped from the first electrode plate 10.

The first electrode plate 10 may have active material coating portions 10a and active material uncoated portions (uncoated portions) 10b formed on both surfaces thereof. The active material uncoated portion 10b may be positioned at the bent portion ① of the cell stack 70 when the first electrode plate 10 is folded and stacked. That is, the plurality of active material uncoated portions 10b are formed at predetermined intervals with respect to both surfaces of the first electrode plate 10, and the remaining curved portions of the entire cell stack 70 including the curved portion ① shown in FIG. 2. It can also be located at The bent portion ① of the cell stack 70 is a portion in which the second electrode plate 50 is not stacked, and even if the active material of the first electrode plate 10 is not formed, the performance of the electrode assembly made of the cell stack 70 is achieved. Does not degrade.

In addition, the width of the active material uncoated portion 10b may be formed longer than the circumferential length of the curved portion ①, so that the active material coating portion 10a may not be positioned on the curved portion ① even in a mechanical error or the like.

In addition, the active material uncoated portion 10b may be formed by forming the active material coating portion 10a on both sides of the first electrode plate 10 and not being formed on the active material uncoated portion 10b or by removing a portion thereof. have.

Therefore, by forming the active material uncoated portion 10b on the first electrode plate 10, the curved portion ① of the cell stack 70 can be removed from the curved portion ① of the cell stack 70 without degrading the performance of the secondary battery including the cell stack 70. By preventing the active material from falling off, it is possible to increase safety / reliability.

Meanwhile, an electrode tab 1 may be formed at an upper end of the first electrode plate 10 to electrically connect the first electrode plate 10 to the outside.

 The first separator supply unit 120 may include a first separator supply roll. The first separator 20 is wound around the first separator feed roll. In addition, as the first separator supply roll rotates, the first separator 20 is unwound and supplied to the first electrode plate assembly supply unit 140. Therefore, the first separator 20 is supplied in a continuous form and stacked.

The second separator supply unit 130 may include a second separator supply roll. The second separator 30 is wound around the second separator supply roll. In addition, as the second separator supply roll rotates, the second separator 30 is unwound and supplied to the first electrode plate assembly supply unit 140. Therefore, the second separators 30 are supplied and stacked in a continuous form.

The first electrode plate assembly supply unit 140 may include a first guide roll 141 and a second guide roll 142.

The first electrode plate 10, the first separator 20, and the second separator 30 supplied from the first electrode plate supply unit 110, the first separator supply unit 120, and the second separator supply unit 130, respectively. It is inserted between the first guide roll 141 and the second guide roll 142. That is, based on the first electrode plate 10 inserted between the first guide roll 141 and the second guide roll 142, the first separator 20 includes the first electrode plate 10 and the first guide roll. The second separator 30 is inserted between the first electrode plate 10 and the second guide roll 142. The first separator 20 and the second separator 30 are disposed and stacked on the lower surface and the upper surface of the first electrode plate 10 to form the first electrode plate assembly 40. In addition, the first electrode plate assembly 40 is supplied to the second electrode plate supply unit 150 as the first guide roll 141 and the second guide roll 142 rotate.

 The second electrode plate supply unit 150 may include a pick and place device. In the pick and place device, the second electrode plate 50 cut to a predetermined length is disposed on the lower surface and the upper surface of the first electrode plate assembly 40, which is supplied from the first electrode plate assembly supply unit 140, respectively. 60). In the pick and place device, the second electrode plate 50 may be disposed on both surfaces of the first electrode plate assembly 40 simultaneously or sequentially on one surface thereof. In addition, the unit cell 60 is stacked on the stack 160 by the folding unit 170.

In addition, the second electrode plate 50 has a polarity opposite to that of the first electrode plate 10. In addition, the active material layer may be formed on both surfaces of the second electrode plate 50 according to its polarity.

In the stack 160, the first electrode plate assembly 40 is folded to stack the unit cells 60. The stacked unit cells 60 form a cell stack 70. The cell stack 70 is stacked in such a manner that separators 20 and 30 are interposed between the first electrode plate 10 and the second electrode plate 50.

The folding unit 170 may include a gripper. The gripper may press the second electrode plate 50 disposed on the lower surface and the upper surface of the first electrode plate assembly 40 to fix the gripper to the first electrode plate assembly 40. The gripper may be fixed to the unit cell 60 to move to the stack 160, thereby folding the first electrode plate assembly 40 to form the cell stack 70. In addition, the gripper may fold the first electrode plate assembly 40 in a Z or S shape.

Meanwhile, the folding unit 170 may include two grippers so that the two grippers may alternately fold the first electrode plate assembly 40. That is, while one gripper folds the first electrode plate assembly 40, the other gripper may prepare for the next folding.

The fixing unit 180 presses the upper end of the cell stack 70 stacked on the stack unit 160, and when the folding unit 170 folds the first electrode plate assembly 40, the first electrode plate assembly ( 40 may be laminated without wrinkles.

Hereinafter, a folding operation of a stack device for a secondary battery according to various embodiments of the present disclosure will be described.

4A to 4H sequentially illustrate folding operations of the stack device for a secondary battery according to various embodiments of the present disclosure.

As shown in FIG. 4A, each of the first electrode plate 10, the first separator 20, and the first electrode plate supply unit 110, the first separator supply unit 120, and the second separator supply unit 130, respectively. The first separator plate assembly in which the second separator 30 is supplied to the first electrode plate assembly supply unit 140 and the first separator 20 and the second separator 30 are stacked on both surfaces of the first electrode plate 10 is provided. 40 is formed. Subsequently, the first electrode plate assembly 40 is supplied to the second electrode plate supply unit 150.

In addition, the second electrode plate supply unit 150 supplies the second electrode plate 50 to both surfaces of the first electrode plate assembly 40 to form the unit cell 60.

As shown in FIG. 4B, the folding unit 170 presses the second electrode plate 50 of the unit cell 60 to be fixed to the first electrode plate assembly 40.

In addition, the fixing unit 180 may press the upper end of the cell stack 70a stacked on the stack 160.

On the other hand, when the cell stack 70a stacked on the stack 160 does not exist, the unit cell 60 moves to the stack 160 and is stacked without the folding operation of the folding unit 170, thereby stacking the cell stack 70a. ). In addition, when the unit cells 60 are first stacked on the stack 160, the unit cells 60 may be formed in a form in which the second electrode plate 50 is disposed only on the upper surface of the first electrode plate assembly 40. Can be.

As shown in FIG. 4C, the folding unit 170 is fixed to the unit cell 60 and moves to the stack unit 160. When the folding unit 170 moves, the first folding unit ② is formed at one end of the unit cell 60 in the direction in which the folding unit 170 moves, and the first electrode plate assembly 40 is supplied. A second folding part ③ is formed at one end of the cell stack 70a in the direction.

As shown in FIG. 4D, the folding unit 170 stacks the unit cells 60 on the stack 160 to form a cell stack 70b. The first folding portion ② and the second folding portion ③ are the first bent portion ④ and the second bent portion ⑤ of the cell stack 70b when the first electrode plate assembly 40 is folded and stacked. Form each.

As shown in FIG. 4E, this process is similar to the process shown in FIG. 4A.

The first electrode plate assembly 40 in which the first separator 20 and the second separator 30 are stacked is formed on both surfaces of the first electrode plate 10 in the first electrode plate assembly supply unit 140. The first electrode plate assembly 40 is supplied to the second electrode plate supply unit 150. In addition, the second electrode plate supply unit 150 supplies the second electrode plate 50 to both surfaces of the first electrode plate assembly 40 to form the unit cell 60.

As shown in FIG. 4F, this process is similar to the process shown in FIG. 4B.

The folding unit 170 presses the second electrode plate 50 of the unit cell 60 to be fixed to the first electrode plate assembly 40.

In addition, the fixing unit 180 may press the upper end of the cell stack 70b to the stack 160.

As shown in FIG. 4G, this process is similar to the process shown in FIG. 4C.

The folding unit 170 is fixed to the unit cell 60 and moves to the stack unit 160. When the folding unit 170 moves, a third folding unit ⑥ is formed at one end of the unit cell 60 in the direction in which the folding unit 170 moves, and the first electrode plate assembly 40 is supplied. A fourth folding part ⑦ is formed at one end of the cell stack 70b in the direction.

As shown in FIG. 4H, this process is similar to the process shown in FIG. 4D.

The folding unit 170 stacks the unit cells 60 on the stack 160 to form a cell stack 70c. The third folded portion (⑥) and the fourth folded portion (⑦) are the third bent portion (⑧) and the fourth bent portion (⑨) of the cell stack 70c when the first electrode plate assembly 40 is folded and stacked. Form each.

Meanwhile, the outer surface of the cell stack 70 completed by this process may be wrapped with the separators 20 and 30.

3 and 4A, the first electrode plate 10 is, for example, spaced apart from the first electrode first coating part 11 and the first electrode first coating part 11. And the first electrode second coating part 12 and the first electrode third coating part 13 spaced apart from the first electrode second coating part 12. In addition, the second electrode plate 50 may also include a second electrode first coating part 51 and a second electrode second coating part 52. Here, by the stack apparatus 100 described above, the second electrode first coating part 51 and the second electrode second coating part (1) below and above the first electrode first coating part 11 respectively. 52 may be located. In addition, a second electrode second coating part 52 and a second electrode third coating part (not shown) may be positioned below the first electrode second coating part 12. In addition, the first electrode third coating part 13 may be positioned on the second electrode third coating part. The stack structure of the secondary battery will be described later.

Hereinafter, a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure will be described.

5A is a flowchart illustrating a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure. 5B is a flowchart of a first electrode plate assembly supplying step of a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure.

As illustrated in FIGS. 5A and 5B, the stacking method for a secondary battery may include a first electrode plate assembly supplying step S100, a second electrode plate supplying step S200, and a folding step S300.

The first electrode plate assembly supplying step (S100) is to supply the first electrode plate assembly 40, and the first electrode plate supplying step (S110), the separator supplying step (S120), and the first electrode plate assembly forming step (S130). ) May be included.

 In the first electrode plate supply step (S110), the first electrode plate 10 is supplied. In the separator supplying step S120, the first separator 20 and the second separator 30 are supplied to the lower surface and the upper surface of the first electrode plate 10. Further, in the step of forming the first electrode plate assembly S130, the first electrode plate assembly 40 is formed by the first separator 20 and the second separator 30 supplied to the bottom surface and the top surface of the first electrode plate 10. ) Is formed.

In the second electrode plate supplying step (S200), the second electrode plate 50 is disposed on the lower surface and the upper surface of the first electrode plate assembly 40 to form a unit cell 60.

In the folding step S300, the first electrode plate assembly 40 is folded so that the separators 20 and 30 are interposed between the first electrode plate 10 and the second electrode plate 50 so that the unit cell 60 is folded. The cell stack 70 is formed by stacking.

According to various embodiments of the present disclosure, a stacking device 100 for a secondary battery and a stacking method using the same may include a first electrode plate assembly 40 in which separators 20 and 30 are stacked on a bottom surface and a top surface of a first electrode plate 10. By laminating using the folding unit 170 in a state in which the second electrode plate 50 is disposed on the lower surface and the upper surface of the joined body, the four pieces can be elaborated in one folding operation without changing the substrate or adding the method. The same effect as that of stacking electrode plates can be achieved.

6A and 6B are plan and side views of a stack device for a secondary battery according to various embodiments of the present disclosure.

As shown in FIGS. 6A and 6B, the secondary battery stack device 200 further includes a first electrode plate cutout 210 and a separator junction 220 in addition to the components of the secondary battery stack device 100 described above. can do. Of course, the rest of the configuration and operation of the secondary battery stack device 200 may share both the configuration and operation of the above-described secondary battery stack device 100.

The first electrode plate cutting unit 210 cuts the first electrode plate 10 continuously supplied from the first electrode plate supply unit 110 to a predetermined predetermined width, thereby cutting the independent first electrode plate 10. It serves to supply to the electrode plate assembly supply unit 140. That is, the first electrode plate cut part 210 serves to supply the independent first electrode plate 10 between the first separator 20 and the second separator 30. The first electrode plate cutout 210 may be, for example, but not limited to, a cutter form facing each other, or a press form facing each other.

Here, the first guide roll 141 and the second guide roll 142 are shown as being spaced apart from each other by a predetermined distance in the horizontal direction in which the first electrode plate 10 is transported, but the present invention is not limited thereto. As in 1, the first guide roll 141 and the second guide roll 142 may be installed in the same position in the up and down direction.

The separator junction portion 220 corresponds to the circumference of the first electrode plate 10 among the first and second separators 20 and 30 located on both surfaces of the first electrode plate 10 (eg, upper and lower surfaces). It serves to join the regions of the first and second separators 20 and 30. Here, the separator bonding part 220 partially melts the regions of the first and second separators 20 and 30 so that the first and second separators 20 and 30 are bonded to each other, or the first and second separators 20, The adhesive may be applied in advance between 30) and cured to allow the first and second separators 20 and 30 to be bonded to each other. The separator junction part 220 may be, for example, but not limited to, heater types facing each other, or press types facing each other.

Meanwhile, among the first and second separators 20 and 30 positioned on both surfaces of the first electrode plate 10 by the separator bonding part 220, the first and second parts corresponding to the circumference of the first electrode plate 10 are provided. The junction region 23 is formed in the regions of the separators 20 and 30, and the junction region 23 may completely surround four sides of the first electrode plate 10 or partially surround the four sides. Preferably, the junction region 23 partially surrounds the four sides of the first electrode plate 10 so that the electrolyte solution can be easily injected into the first electrode plate 10. That is, as shown in FIG. 6A, the junction region 23 may have an open shape at approximately the upper side, the lower side, the left side, and the right side of the first electrode plate 10, respectively.

7A to 7F sequentially illustrate folding operations of the stack device for a secondary battery according to various embodiments of the present disclosure. As shown in FIGS. 7A to 7F, the folding operation of the stacking apparatus for secondary batteries may further include a first electrode plate cutting operation and a separator bonding operation in addition to the folding method of the stacking apparatus for secondary batteries. Of course, the remaining configuration and operation of the folding operation of the stacking device for secondary batteries may share the configuration and operation of the folding operation of the stacking device for secondary batteries.

As shown in FIG. 7A, each of the first electrode plate 10, the first separator 20, and the first electrode plate supply unit 110, the first separator supply unit 120, and the second separator supply unit 130, respectively. The first separator plate assembly in which the second separator 30 is supplied to the first electrode plate assembly supply unit 140 and the first separator 20 and the second separator 30 are stacked on both surfaces of the first electrode plate 10 is provided. 40 is formed.

Here, the first electrode plate 10 from the first electrode plate supply unit 110 is cut to a predetermined length by the first electrode plate cutting unit 210 to the first electrode plate assembly supply unit 140 in an independent form. By being supplied, the first electrode plate assembly 40 has a first electrode plate 10 of an independent type rather than a continuous form. That is, before the first electrode plate 10 is supplied to the first electrode plate assembly supply unit 140, the first electrode plate 10 that is separated / independent by the cutting operation of the first electrode plate is provided. It is supplied to the one electrode plate assembly supply unit 140.

Subsequently, the first electrode plate assembly 40 is supplied to the second electrode plate supply unit 150. In addition, the second electrode plate supply unit 150 supplies the independent second electrode plate 50 to both surfaces of the first electrode plate assembly 40 to form the unit cell 60.

Before or after the second electrode plate 50 is supplied, the separator bonding operation is further performed. In other words, before or after the formation of the unit cell 60, the first and second separators 20 and 30 positioned on both surfaces (eg, upper and lower surfaces) of the first electrode plate 10 may be used. The separator bonding region 23 is formed by joining regions of the first and second separators 20 and 30 corresponding to the circumference of the electrode plate 10.

In the drawing, reference numeral 111 is a fixing part which stably fixes the position of the first electrode plate 10 when the first electrode plate 10 is cut by the first electrode plate cutting part 210.

Meanwhile, since the operations illustrated in FIGS. 7B to 7F are substantially the same as the operations illustrated in FIGS. 4C to 4H, the description of the operations illustrated in FIGS.

8 is a flowchart illustrating a first electrode plate assembly supplying step of a stacking method using a stacking device for a secondary battery according to various embodiments of the present disclosure.

As shown in FIG. 8, in the stacking method for secondary batteries, the first electrode plate assembly supplying step (S100A) is to supply the first electrode plate assembly 40, and the first electrode plate cutting step (S101) and the first electrode are provided. It may include a plate supply step (S110), a separator supply step (S120), a separator bonding step (S121) and the first electrode plate assembly forming step (S130).

In the first electrode plate cutting step S101, the first electrode plate 10 unwound from the first electrode plate supply unit 110 is cut by the first electrode plate cutting unit 210 by a predetermined width and supplied.

In the first electrode plate supplying step S110, the electrode plate 10 cut by the predetermined width as described above is supplied to the first electrode plate assembly supply unit 140.

In the separator supplying step S120, the first separator 20 and the second separator 30 are supplied to the lower surface and the upper surface of the first electrode plate 10.

In the separator bonding step (S121), among the first and second separators 120 and 130 positioned on both surfaces of the first electrode plate 10 by the separator bonding unit 220, the peripheral area of the first electrode plate 10 corresponds to the peripheral area. By joining the regions of the first and second separators 120 and 130, the junction regions 23 are formed in the first and second separators 120 and 130 corresponding to the circumference of the first electrode plate 10.

In the first electrode plate assembly forming step (S130), the first separator 20 and the second separator 30 supplied to the lower surface and the upper surface of the first electrode plate 10 are stacked to form the first electrode plate assembly 40. Is completed.

As such, the stack device 200 and the method using the same according to various embodiments of the present disclosure supply the first electrode plate 10 and the second electrode plate 50 which are individually cut, and particularly, Two separators 20 and 30 are formed by joining the regions of the separators 20 and 30 corresponding to the circumferential region of the first electrode plate 10 among the separators 20 and 30 located on both surfaces of the one electrode plate 10. In order to prevent the first electrode plate 10 from flowing, the secondary battery having excellent safety / reliability is manufactured.

9 is a schematic diagram illustrating a rechargeable battery 300 according to various embodiments of the present disclosure. Here, the secondary battery 300 is shown during the lamination process for easy understanding of the present invention.

As illustrated in FIG. 9, the secondary battery 300 according to the embodiment of the present invention may include a first electrode plate 10, separators 20 and 30, and a second electrode plate 50.

The first electrode plate 10 is a first electrode plate second coating portion 12 formed spaced apart from the first electrode plate first coating portion 11 and the first electrode plate first coating portion 11 in the vertical direction. It may include. In addition, the first electrode plate 10 may further include a first electrode plate third coating part 13 spaced apart from the first electrode plate second coating part 12 in a vertical direction.

The separators 20 and 30 surround the first electrode plate 10 at the top and bottom thereof. For example, the separators 20 and 30 may respectively cover the first electrode plate first coating part 11, the first electrode plate second coating part 12, and the first electrode plate third coating part 13, respectively. It can be wrapped in the bottom.

The second electrode plate 50 has a second electrode plate second coating portion 52 formed spaced apart from the second electrode plate first coating portion 51 in a vertical direction from the second electrode plate first coating portion 51. It may include. In addition, the second electrode plate 50 may further include a second electrode plate third coating part 53 spaced apart from the second electrode plate second coating part 52 in the vertical direction.

Meanwhile, according to the stacking device and the stacking method described above, the first electrode plate 10 and the separators 20 and 30 surrounding the upper and lower portions may be formed in a meander shape. That is, in the secondary battery 300 according to the embodiment of the present invention, the first electrode plate 10 of the first electrode plate 10 is disposed between the first coating part 11 and the first electrode plate second coating part 12. The apparatus may further include a first folding area 231 formed by folding in one direction. In addition, in the secondary battery 300 according to the embodiment of the present invention, the first electrode plate 10 of the first electrode plate 10 is disposed between the second coating portion 12 and the first electrode plate third coating portion 13. The display device may further include a second folding area 232 formed by folding in two directions. Here, the first direction and the second direction may be opposite to each other. Strictly speaking, the regions of the separators 20 and 30 corresponding to the space between the first electrode plate first coating portion 11 and the first electrode plate second coating portion 12 of the first electrode plate 10 may be formed. The first folding area 231 may be formed by folding in one direction. In addition, an area of the separators 20 and 30 corresponding to the first electrode plate between the second coating part 12 and the first electrode plate third coating part 13 of the first electrode plate 10 is first. The second folding area 232 may be formed by folding in a second direction opposite to the direction.

In addition, under this structure, the second electrode plate first coating part 51 of the second electrode plate 50 may be positioned above the first electrode plate first coating part 11, and the second electrode plate agent may be formed. The second coating part 52 may be positioned on the first electrode plate second coating part 12, respectively. That is, the second electrode plate first coating part 51 and the second electrode plate second coating part 52 are respectively the first electrode plate first coating part 11 and the first electrode plate second coating part 12. It can be stacked facing.

In other words, the first electrode plate second coating part 12 is interposed between the second electrode plate first coating part 51 and the second electrode plate second coating part 52, and the first electrode plate first The first coating part 11 is positioned under the first coating part 51 of the second electrode plate. In other words, the second electrode plate first coating part 51 is formed around the first folding area 231 and / or the first bonding area 221 to be described below. And the first electrode plate between the second coating part 12.

In addition, the second electrode plate second coating portion 52 of the second electrode plate 50 is positioned under the first electrode third coating portion 13, and the second electrode plate third coating portion 53 is The first electrode may be positioned above the third coating part 13. That is, the second electrode plate second coating part 52 and the second electrode plate third coating part 53 are respectively the first electrode plate second coating part 12 and the first electrode plate third coating part 13. It can be stacked facing.

In other words, the first electrode plate third coating part 13 is interposed between the second electrode plate second coating part 52 and the second electrode plate third coating part 53, and the first electrode plate. The second coating part 12 is positioned under the second electrode plate second coating part 52. In other words, the second electrode plate second coating part 52 may be formed of the first electrode plate second coating part 12 and the second electrode around the second folding area 232 and / or the second bonding area 222. It is interposed between the first electrode plate third coating portion 13.

With this stack structure, in the secondary battery 300 according to the present invention, lithium ions move between the first electrode plate 10 and the second electrode plate 50 with a separator therebetween to operate as a secondary battery. .

Subsequently, in the secondary battery 300 according to the embodiment of the present invention, the separators 20 and 30 between the first electrode plate first coating part 11 and the first electrode plate second coating part 12 are formed. It may further include a first junction region 221 formed by bonding to each other. In addition, in the rechargeable battery 300 according to the exemplary embodiment, the separators 20 and 30 between the first electrode plate second coating part 12 and the first electrode plate third coating part 13 are bonded to each other. And may further include a second junction region 222 formed. The first electrode plate 10 is constrained inside the separators 20 and 30 by the first junction region 221 and the second junction region 222 of the separators 20 and 30. The plate 10 and the second electrode plate 50 are not electrically shorted with each other.

In addition, as shown in FIG. 6A, the junction regions 221 and 222 may include a separator region and / or a first portion between the first electrode plate first coating portion 11 and the first electrode plate second coating portion 12. In addition to the separator region between the electrode plate second coating portion 12 and the first electrode plate third coating portion 13, the region of the separator corresponding to the four sides of the first electrode plate first coating portion 11 and / or The separator may be formed in the separator region corresponding to the four sides of the first electrode plate second coating part 12. Therefore, the first electrode plate 10 may be more stably positioned in the separators 20 and 30. That is, the first electrode plate 10 may be restrained without being separated out of four directions of the separators 20 and 30.

In this manner, in the secondary battery 300 according to the present invention, the first and second folding regions 231 and 232 are formed in the separators 20 and 30, and the first and second folding regions 231 and 232 are respectively formed in the first and second folding regions 231 and 232. By forming the two junction regions 221 and 222, the first electrode plate 10 is stably positioned inside the separators 20 and 30 without flowing. Therefore, the electrical short phenomenon between the first electrode plate 10 and the second electrode plate 50 is suppressed. In addition, since the first and second junction regions 221 and 222 are discontinuously formed in the separators 20 and 30, the electrolyte may easily reach the first electrode plate 10.

What has been described above is merely one of various embodiments for implementing a stacking device for a secondary battery, a stacking method using the same, and a secondary battery according to the various embodiments of the present invention. Not limited to the examples, as claimed in the claims below, those skilled in the art to which the invention belongs without departing from the gist of the invention to the extent that various changes can be made It will be said to have a spirit.

Claims (22)

1. A first electrode plate including a first electrode first coating part and a first electrode second coating part spaced apart from the first electrode first coating part, and a first electrode having separators stacked on both surfaces of the first electrode plate. A first electrode plate assembly supply unit for supplying a plate assembly;

   A second electrode plate supply unit which forms a unit cell by disposing a second electrode first coating portion and a second electrode second coating portion of the second electrode plate on both surfaces of the first electrode plate assembly, respectively. ; And

   By folding the first electrode plate assembly on which the unit cell is formed, the second electrode first coating part or the second electrode second coating part of the second electrode plate is coated on the first electrode of the first electrode plate. A stacking device for a secondary battery comprising a folding portion to face a portion to form a stack.
2. The method of claim 1,

   A first electrode plate supply unit supplying the first electrode plate to the first electrode plate assembly supply unit; And

   A separator supply unit for supplying the separators to the first electrode plate assembly supply unit,

   The first electrode plate assembly supply unit stacks and stacks the first electrode plate and the separators.
3. The method of claim 1,

   The first electrode plate of the first electrode plate assembly is supplied in a continuous form,

   The second electrode plate is cut to a predetermined length is disposed on both sides of the first electrode plate assembly for stacking device for a secondary battery.
4. The method of claim 1,

   The first electrode plate is cut into a predetermined length and supplied in an independent form,

   The second electrode plate is cut to a predetermined length is disposed on both sides of the first electrode plate assembly for stacking device for a secondary battery.
5. The method of claim 1,

   And a separator bonding unit configured to bond regions of the separator corresponding to the circumferential region of the first electrode plate among the separators positioned on both surfaces of the first electrode plate.
6. The method of claim 1,

   The folding unit includes a gripper for pressing the second electrode plate disposed on both surfaces of the first electrode plate assembly to fix the first electrode plate assembly to the first electrode plate assembly, and to be fixed to the unit cell to fold the first electrode plate assembly. Stack device for secondary batteries.
7. The method of claim 1,

   The folding part includes a first folding part and a second folding part,

   And stacking the first electrode plate assembly, in which the first and second folding portions alternately form the unit cells, to form the cell stack.
8. The method of claim 1,

   And a fixing unit configured to press and fix the cell stack during the folding operation of the folding unit.
9. The method of claim 1,

   The first electrode plate is a secondary battery stack device, the active material is removed in the region forming the curved portion of the cell stack.
10. A first electrode plate including a first electrode first coating part and a first electrode second coating part spaced apart from the first electrode first coating part, and a first electrode having separators stacked on both surfaces of the first electrode plate. A first electrode plate assembly supplying step of supplying a plate assembly;

    Supplying a second electrode plate to form a unit cell by disposing the second electrode first coating portion and the second electrode second coating portion of the second electrode plate on both surfaces of the first electrode plate assembly of the first electrode plate assembly step; And

    By folding the first electrode plate assembly on which the unit cell is formed, the second electrode first coating part or the second electrode second coating part of the second electrode plate is coated on the first electrode of the first electrode plate. A stacking method for a secondary battery comprising a folding step of forming a cell stack facing a portion.
11. The method of claim 10,

    The first electrode plate assembly supplying step

    A first electrode plate supplying step of supplying the first electrode plate;

    A separator supplying step of supplying separators to both surfaces of the first electrode plate; And

    And stacking separators supplied on both sides of the first electrode plate to form a first electrode plate assembly.
12. The method of claim 10,

    In the supplying step of the first electrode plate assembly, the first electrode plate is supplied in a continuous form,

    In the second electrode plate supplying step, the second electrode plate is cut to a predetermined length and disposed on both sides of the first electrode plate assembly.
13. The method of claim 10,

    In the step of supplying the first electrode plate assembly, the first electrode plate is cut into a predetermined length and supplied in an independent form.

    In the second electrode plate supplying step, the second electrode plate is cut to a predetermined length and disposed on both sides of the first electrode plate assembly.
14. The method of claim 10,

    After the step of supplying the first electrode plate assembly,

    Separator bonding step of bonding a region of the separator corresponding to the circumferential region of the first electrode plate of the separators located on both sides of the first electrode plate.
15. The method of claim 11,

    The first electrode plate of the first electrode plate supplying step is a stacking method for a secondary battery in which the active material in the region forming the curved portion of the cell stack is removed.
16. A first electrode plate first coating part;

    A first electrode plate second coating part;

    Separators surrounding the first electrode plate first coating part and the first electrode plate second coating part at upper and lower parts thereof;

    A second electrode plate first coating part stacked to face the first electrode plate first coating part; And

    And a first folding area in which the first electrode part between the first coating part and the first electrode plate second coating part is folded in a first direction.

    And the folded first electrode plate second coating part is laminated to face the second electrode plate first coating part.
17. The method of claim 16,

    And a first junction region formed by bonding the separators between the first electrode plate first coating portion and the first electrode plate second coating portion to each other.
18. The method of claim 16,

    The secondary battery further comprises a second electrode plate second coating portion which is stacked facing the first electrode plate second coating portion.
19. The method of claim 18,

    Further comprising a third coating part of the first electrode plate laminated to face the second coating part of the second electrode plate,

    And a second folding area in which a space between the first electrode plate second coating part and the first electrode plate third coating part is folded in a second direction.

    And the folded first electrode plate third coating part is laminated to face the second electrode plate second coating part.
20. The method of claim 19,

    And a second bonding region formed by bonding the separators between the first electrode plate second coating portion and the first electrode plate third coating portion to each other.
21. The method of claim 19,

    The secondary battery is characterized in that the first direction and the second direction are different directions.
22. The method of claim 20,

    The secondary battery further comprises a second electrode plate third coating portion which is stacked facing the first electrode plate third coating portion.

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