KR-20260063376-A - ELECTRODE ASSEMBLY MANUFACTURING DEVICE, ELECTRODE ASSEMBLY AND BATTERY CELL COMPRISING THE SAME

KR20260063376AKR 20260063376 AKR20260063376 AKR 20260063376AKR-20260063376-A

Abstract

An electrode assembly manufacturing device according to one embodiment of the present invention comprises: an electrode stacking sheet manufacturing unit for manufacturing an electrode stacking sheet in which a plurality of cathodes are spaced apart from each other at a first interval between a first separator sheet and a second separator sheet, and a plurality of anodes are alternately arranged at the lower part of the first separator sheet and the upper part of the second separator sheet at the first intervals; and an electrode assembly manufacturing unit for manufacturing a zigzag-shaped electrode assembly by sequentially folding the electrode stacking sheet in opposite directions between a pair of adjacent cathodes among the plurality of cathodes, wherein the electrode stacking sheet comprises a first adhesive layer applied between the first separator sheet and the cathode and between the second separator sheet and the cathode, and a second adhesive layer applied between the first separator sheet and the anode and between the second separator sheet and the anode. An electrode assembly according to another embodiment of the present invention comprises an electrode stacking sheet in which a plurality of cathodes are spaced apart from each other at a first interval between a first separator sheet and a second separator sheet, and a plurality of anodes are alternately arranged at the lower portion of the first separator sheet and the upper portion of the second separator sheet at the first intervals. The electrode stacking sheet comprises a first adhesive layer applied between the first separator sheet and the cathode and between the second separator sheet and the cathode, and a second adhesive layer applied between the first separator sheet and the anode and between the second separator sheet and the anode. The electrode stacking sheet is in a zigzag shape in which a pair of adjacent cathodes among the plurality of cathodes are sequentially folded in opposite directions.

Inventors

최성현

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (14)

An electrode stacking sheet manufacturing unit for manufacturing an electrode stacking sheet in which a plurality of cathodes are spaced apart from each other at a first interval between a first separator sheet and a second separator sheet, and a plurality of anodes are alternately arranged at the lower part of the first separator sheet and the upper part of the second separator sheet at the first intervals; and The electrode assembly manufacturing unit includes a plurality of electrode laminated sheets that sequentially fold a pair of adjacent cathodes among the plurality of cathodes in opposite directions to manufacture a zigzag-shaped electrode assembly. The electrode assembly manufacturing apparatus comprises the electrode laminated sheet, the first adhesive layer applied between the first separator sheet and the cathode and between the second separator sheet and the cathode, and the second adhesive layer applied between the first separator sheet and the anode and between the second separator sheet and the anode.
In Paragraph 1, The above electrode laminated sheet is, An electrode assembly manufacturing apparatus having a first stacking section in which the first separator sheet, the cathode, the second separator sheet, and the anode are sequentially stacked, and a second stacking section in which the anode, the first separator sheet, the cathode, and the second separator sheet are sequentially stacked, arranged alternately multiple times.
In paragraph 2, The electrode assembly manufacturing unit is an electrode assembly manufacturing device that sequentially folds the first laminated section and the second laminated section, which are arranged adjacently to each other in the electrode laminated sheet, in opposite directions.
In Paragraph 3, A battery cell manufacturing apparatus in which, in the electrode stacking sheet, the error between the length of the first separator sheet and the length of the second separator sheet located between the first stacking portion and the second stacking portion arranged adjacently to each other is 0 mm or more to 1 mm or less.
In Paragraph 3, The above electrode assembly manufacturing unit is, After folding the electrode laminate sheet in the first direction so that the upper portion of the second separator sheet included in the second laminate and the upper portion of the second separator sheet included in the first laminate face each other, The electrode laminated sheet is folded in a second direction so that the lower part of the first separator sheet included in the first laminated part and the anode located at the lower part of the first separator sheet included in the second laminated part face each other, An electrode assembly manufacturing device in which the first direction and the second direction are opposite directions.
In paragraph 1, In the above electrode laminated sheet, An electrode assembly manufacturing apparatus in which the first adhesive layer is applied to the upper part of the first separator sheet and the lower part of the second separator sheet, and the second adhesive layer is applied to the lower part of the first separator sheet and the upper part of the second separator sheet.
In paragraph 6, An electrode assembly manufacturing device in which the first adhesive layer is applied to the entire upper portion of the first separator sheet and the entire lower portion of the second separator sheet.
In paragraph 6, The electrode assembly manufacturing apparatus wherein the second adhesive layer is applied at the second intervals where the anode is disposed at the lower part of the first separator sheet and applied at the third intervals where the anode is disposed at the upper part of the second separator sheet.
In paragraph 6, The above electrode assembly manufacturing device is, A first coating portion forming the second adhesive layer on the lower part of the first separator sheet, A second coating portion forming the first adhesive layer on the upper portion of the first separator sheet; A third coating portion forming the first adhesive layer on the lower part of the second separator sheet; and An electrode assembly manufacturing apparatus further comprising a fourth coating portion forming the second adhesive layer on the upper portion of the second separator sheet.
In paragraph 1, An electrode assembly manufacturing device in which the first adhesive layer and the second adhesive layer are each formed by applying an adhesive in a plurality of dots or lines.
In Paragraph 1, The above electrode laminated sheet manufacturing unit is, A first anode reel from which a first anode sheet is unwound, wherein a plurality of first anodes are formed on the lower part of the first separator sheet among the plurality of anodes; A second anode reel from which a second anode sheet is unwound, wherein the plurality of second anodes disposed on the upper portion of the second separator sheet among the plurality of anodes are formed; A cathode reel from which a cathode sheet having a plurality of cathodes formed thereon is unwound; A first separator reel from which a first separator sheet interposed between the plurality of first anodes and the plurality of cathodes is unwound; and An electrode assembly manufacturing apparatus comprising a second separator reel through which a second separator sheet interposed between the plurality of second anodes and the plurality of cathodes is unwound.
In Paragraph 11, The above electrode laminated sheet manufacturing unit is, A first cutting part for cutting the first anode in the first anode sheet, A second cutting part for cutting the second anode in the second anode sheet, and An electrode assembly manufacturing apparatus further comprising a third cutting section for cutting the cathode in the cathode sheet.
The electrode stacking sheet comprises a plurality of cathodes spaced apart from each other at a first interval between a first separator sheet and a second separator sheet, and a plurality of anodes alternately spaced at the lower part of the first separator sheet and the upper part of the second separator sheet at the first intervals. The electrode laminated sheet comprises a first adhesive layer applied between the first separator sheet and the cathode and between the second separator sheet and the cathode, and a second adhesive layer applied between the first separator sheet and the anode and between the second separator sheet and the anode. An electrode assembly in which the electrode laminated sheet is in a zigzag shape, sequentially folded in opposite directions between a pair of adjacent cathodes among the plurality of cathodes.
A battery cell comprising the electrode assembly of claim 13, It includes a battery case that accommodates the above electrode assembly together with an electrolyte, and The first adhesive layer and the second adhesive layer are each a battery cell dissolved in the electrolyte.

Description

Electrode assembly manufacturing device, electrode assembly, and battery cell comprising the same The present invention relates to an electrode assembly manufacturing apparatus, and more specifically, to an electrode assembly manufacturing apparatus in which a plurality of cathodes disposed at a predetermined interval between a pair of separator sheets and a plurality of anodes disposed at a predetermined interval on the upper and lower portions of the pair of separator sheets are sequentially folded in opposite directions to manufacture a zigzag-shaped electrode assembly, thereby improving process speed and simplifying the process. Furthermore, the present invention relates to an electrode assembly and a battery cell including the same, and more specifically, to an electrode assembly and a battery cell including the same in which a plurality of negative electrodes disposed at a predetermined interval between a pair of separator sheets and a plurality of positive electrodes disposed at a predetermined interval on the upper and lower portions of the pair of separator sheets are sequentially folded in opposite directions, thereby improving the process speed and simplifying the process. Generally, types of secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, and lithium-ion polymer batteries. These secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3 players, mobile phones, PDAs, portable game devices, power tools, and E-bikes, but also in large products requiring high output such as electric vehicles and hybrid vehicles, as well as in power storage devices and backup power storage devices that store surplus generated power or renewable energy. To manufacture such a secondary battery, first, an electrode active material slurry is applied to a positive electrode current collector and a negative electrode current collector to produce a positive electrode and a negative electrode, and then an electrode assembly of a predetermined shape is formed by stacking them on both sides of a separator. Then, the electrode assembly is placed in a battery case, and after injecting an electrolyte, it is sealed. Electrode assemblies are classified into various types. For example, there are the Simple Stack Type, in which anodes, separators, and cathodes are simply stacked alternately without manufacturing unit cells; the Lamination & Stack Type (L&S), in which unit cells are manufactured first using anodes, separators, and cathodes, and then these unit cells are stacked; the Stack & Folding Type (S&F), in which multiple unit cells are attached spaced apart on one side of a separator sheet that is elongated on one side, and the separator sheet is repeatedly folded in the same direction from one end; and the Z-Folding Type, in which multiple electrodes or unit cells are alternately attached to one side and the other side of a separator sheet that is elongated on one side, and the method of folding the separator sheet in a specific direction from one end and then folding it in the opposite direction is repeated alternately. Among these, the Z-Folding Type is frequently used recently due to its high alignment and electrolyte impregnation. However, conventionally, when manufacturing such a Z-folding type electrode assembly, individual cut electrode sheets were placed on a separator sheet and then stacked in a zigzag shape. However, in this case, the stacking speed was relatively slow, which reduced the production speed of the electrode assembly and caused a problem of reduced space efficiency as the production equipment became more complex. Accordingly, there is a need to develop an electrode assembly manufacturing device that manufactures Z-folding type electrode assemblies with improved productivity and space efficiency. FIG. 1 is a flowchart of a method for manufacturing an electrode assembly according to one embodiment of the present invention. FIG. 2 is a diagram showing the manufacture of an electrode laminated sheet in an electrode assembly manufacturing device according to one embodiment of the present invention. Figure 3 is a diagram showing the application of adhesive to the upper and lower parts of the first separator sheet in the electrode laminated sheet of Figure 2. Figure 4 is a diagram showing the electrode assembly being manufactured by folding the electrode laminated sheet of Figure 2. Figure 5 is a drawing showing an electrode assembly manufactured in the electrode assembly manufacturing device of Figure 2. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and t