Pouch-type battery cell pressing member, battery module including same, and pouch-type battery cell pressing method using same

Abstract

The present invention relates to a pouch-type battery cell pressing member, a battery module including same, and a pouch-type battery cell pressing method using same, the pouch-type battery cell pressing member comprising: a first pressing unit that includes a first base plate, a first elastic member having a first end coupled to the first base plate, and a plurality of first contact parts coupled to a second end of the first elastic member; and a second pressing unit that includes a second base plate, a second elastic member having a first end coupled to the second base plate, and a plurality of second contact parts coupled to a second end of the second elastic member. The plurality of first contact parts and the plurality of second contact parts constitute a first region in which a pressing surface is substantially parallel to the first base plate and the second base plate and a second region in which the pressing surface is inclined relative to the first base plate and the second base plate.

Description

A pouch-type battery cell pressurizing member, a battery module including the same, and a pouch-type battery cell pressurizing method using the same

[0001] This application is based on Korean Patent Applications No. 10-2024-0132482 and No. 10-2025-0124019, which were filed with the Korean Intellectual Property Office on September 30, 2024 and September 2, 2025, respectively, and whose contents are incorporated in whole into this application by reference herein, and claims priority thereof.

[0002] The present invention relates to a pouch-type battery cell pressurizing member, a battery module including the same, and a method for pressurizing a pouch-type battery cell using the same.

[0003]

[0004] Rechargeable lithium secondary batteries are widely used as energy sources for wireless mobile devices or wearable devices worn on the body, as well as for electric vehicles and hybrid electric vehicles, which are presented as alternatives to conventional gasoline and diesel vehicles that cause air pollution.

[0005] Lithium secondary batteries generate and supply current through the movement of lithium ions within the battery during the charging and discharging process. If the smooth movement of lithium ions does not occur, side reactions may occur, which can lead to negative consequences in terms of the performance and safety of the secondary battery.

[0006]

[0007] The present invention provides a pouch-type battery cell pressurizing member that prevents or suppresses problems such as lithium precipitation in the sliding part by equally pressurizing the center of the electrode assembly and the sliding part, a battery module including the same, and a pouch-type battery cell pressurizing method using the same.

[0008]

[0009] A pouch-type battery cell pressurizing member according to the present invention comprises a first base plate, a first elastic member having a first end coupled to the first base plate, and a first pressurizing member including a plurality of first contact portions coupled to a second end of the first elastic member, and a second pressurizing member including a second base plate, a second elastic member having a first end coupled to the second base plate, and a plurality of second contact portions coupled to a second end of the second elastic member, wherein the plurality of first contact portions and the plurality of second contact portions may form a first region in which the pressurizing surface is substantially parallel to the first base plate and the second base plate, and a second region in which the pressurizing surface is inclined with respect to the first base plate and the second base plate.

[0010] In the pouch-type battery cell pressurizing member according to the present invention, the plurality of first contact portions and the plurality of second contact portions in the second region may be formed such that the angle of inclination increases toward both ends of the first base plate or the second base plate in the full-length direction.

[0011] In the pouch-type battery cell pressurizing member according to the present invention, the lengths of the first elastic member and the second elastic member coupled to the plurality of first contact portions and the plurality of second contact portions may increase towards both ends in the full-length direction of the first base plate or the second base plate.

[0012] In the pouch-type battery cell pressurizing member according to the present invention, the plurality of first contact portions and the plurality of second contact portions may be combined with elastic members arranged in two rows along the full width direction of the first base plate or the second base plate.

[0013] In the pouch-type battery cell pressurizing member according to the present invention, the number of the plurality of first contact portions and the plurality of second contact portions for each of the second regions may be provided within the range of 3 to 10.

[0014] In the pouch-type battery cell pressurizing member according to the present invention, the end in the electric direction of the first base plate and the end in the electric direction of the second base plate may be located inwardly within a range of about 0 mm to 3 mm or less from the outer periphery in the direction in which the electrode lead of the pouch-type battery cell protrudes.

[0015] In the pouch-type battery cell pressurizing member according to the present invention, the width of the plurality of first contact portions and the plurality of second contact portions may be about 2 mm to 5 mm.

[0016] In the pouch-type battery cell pressurizing member according to the present invention, the width of the plurality of first contact portions and the plurality of second contact portions may be about 3 mm.

[0017] In the pouch-type battery cell pressurizing member according to the present invention, the lengths of the plurality of first contact portions and the lengths of the plurality of second contact portions may be configured to be larger than the full width of the pouch-type battery cell.

[0018] A battery module that accommodates a pouch-type battery cell pressurizing member according to the present invention comprises a plurality of pouch-type battery cells, the pouch-type battery cell pressurizing member interposed between the plurality of pouch-type battery cells, and a module case that accommodates the plurality of pouch-type battery cells and the pouch-type battery cell pressurizing member, wherein the pouch-type battery cell pressurizing member may be interposed one at a time at two or more locations among the plurality of pouch-type battery cells.

[0019] In the battery module according to the present invention, the pouch-type battery cell pressurizing member may be arranged such that the outer surface of the first base plate, to which the first elastic member is not attached, and the outer surface of the second base plate, to which the second elastic member is not attached, face each other.

[0020] A method for pressurizing a pouch-type battery cell using a pouch-type battery cell pressurizing member according to the present invention comprises: a first step of placing a first pressurizing member on the upper part of the pouch-type battery cell and a second pressurizing member on the lower part of the pouch-type battery cell; and a second step of pressing the first pressurizing member and the second pressurizing member toward the pouch-type battery cell, wherein the second step may involve pressing a first region and pressing a second region simultaneously.

[0021] In the method for pressurizing a pouch-type battery cell according to the present invention, the second step may proceed as a process of continuously applying uniform force to the entire first base plate and the second base plate for a period of about 2 seconds or more to 10 minutes or less.

[0022] In the method for pressurizing a pouch-type battery cell according to the present invention, the second step may be performed by repeating the pressurization and release of pressure two or more times.

[0023] In the method for pressurizing a pouch-type battery cell according to the present invention, the second step involves continuously pressurizing the first region with a uniform force for a period of about 2 seconds or more to 10 minutes or less, and applying vibration to the second region while it is pressurized.

[0024] In the method for pressurizing a pouch-type battery cell according to the present invention, the vibration may be ultrasonic.

[0025] The present invention can also be provided in a form that combines various means for solving the above problem.

[0026]

[0027] As described above, the pouch-type battery cell pressing member according to the present invention can press the center and the sliding part with the same force for a battery cell having a plurality of electrodes stacked with a sliding part.

[0028] Therefore, it is possible to prevent or suppress the degradation of battery cell performance caused by lithium precipitation resulting from the reduction in pressure of the sliding part and increased resistance.

[0029]

[0030] The following drawings attached to this specification illustrate embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0031] FIG. 1 is a front view of a pouch-type battery cell pressurizing member according to the present invention.

[0032] Figure 2 is a partial enlarged view of Figure 1.

[0033] Figure 3 is a perspective view of the lower pressurizing part of Figure 1.

[0034] Figure 4 is a graph showing the ratio of the thickness of the tab side to the thickness of the center of the battery cell.

[0035] FIG. 5 is a front view of the pouch-type battery cell pressing member of FIG. 1 pressing the pouch-type battery cell.

[0036] FIG. 6 is a vertical cross-sectional view of a battery module according to the present invention.

[0037] Figure 7 is a flowchart showing a method for pressurizing a pouch-type battery cell using a pouch-type battery cell pressurizing member.

[0038] In parts of the attached drawings, corresponding components are given the same reference numerals. Those skilled in the art understand that the drawings are intended to illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to aid in understanding various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated compared to others. Additionally, elements of known technology that are useful or essential in commercially viable embodiments may often be omitted so as not to hinder the spirit of the various embodiments of the present invention.

[0039]

[0040] Embodiments that enable a person skilled in the art to easily practice the present invention are described in detail below with reference to the attached drawings. In describing the operating principles of the embodiments of the present invention in detail, specific descriptions of related known functions or configurations are omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention.

[0041] The same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected but also cases where they are indirectly connected with other elements in between. Furthermore, the inclusion of a certain component means that, unless specifically stated otherwise, it does not exclude other components but rather implies that additional components may be included.

[0042] Descriptions that specify components by limiting or adding them may be applied to all inventions unless specifically limited, and are not limited to descriptions of specific inventions.

[0043] Throughout the description of the invention and claims of this application, anything indicated in the singular includes cases where it is plural unless otherwise noted.

[0044] Throughout the description of the invention and the claims of the present invention, "or" includes "and" unless otherwise noted. Therefore, "comprising A or B" means all three of the above cases: including A, including B, or including both A and B.

[0045] During operation, lithium-ion batteries exhibit a phenomenon called lithium precipitation, in which lithium ions accumulate on the negative electrode surface in the form of metallic lithium due to various causes. This can lead to battery performance degradation, reduced capacity, shortened lifespan, and, in severe cases, safety issues (thermal runaway, short circuit, etc.).

[0046] The electrode of a lithium secondary battery includes a retaining portion on one or both sides of an electrode plate where an electrode active material is coated, and a non-coated portion where the electrode active material is not coated, and an electrode tab may be formed on the non-coated portion.

[0047] The manufacturing process of the electrode comprises the steps of: coating an electrode active material on the portion of an electrode sheet wound in a roll shape, excluding the portion where an electrode tab is to be formed; drying and rolling the electrode active material; slitting the electrode sheet; and notching the slitted electrode sheet into a unit electrode.

[0048] A phenomenon may occur where the retaining portion coated with the electrode active material flows down from the outer edge before drying; this area is referred to as the sliding portion. Since the electrode thickness decreases in the sliding portion, when the electrode and the separator are stacked and laminated, the electrode and the separator may not adhere and may lift up.

[0049] Such phenomena can, for example, reduce the mobility of lithium ions passing through the separator, thereby forming a negative overpotential, and can accelerate the decomposition of the electrolyte and exacerbate the imbalance in the concentration of lithium salts contained in the electrolyte, leading to rapid depletion of the electrolyte. This results in the precipitation of lithium.

[0050] The sliding portion described above primarily occurs at the tab portion corresponding to the edge during electrode active material coating. Consequently, an electrode assembly formed by stacking electrodes with sliding portions also results in a thinner thickness on the tab side compared to the center. Furthermore, in a battery module formed by stacking multiple battery cells, the effect of this thickness variation becomes more pronounced. As charging and discharging cycles are repeated, the battery cells within the battery module become progressively thicker; however, since the size of the frame within the battery module remains constant, the battery cells are subjected to increasing pressure. Consequently, because the thickness differs between the center and the tab side of the battery cell, the magnitude of the pressure applied to the battery cell becomes smaller on the tab side compared to the center. This variation in applied pressure causes the movement speed of lithium ions to vary by location, leading to lithium precipitation on the tab side.

[0051] Accordingly, to increase the thickness of the tab side, a method is used to control the width of the sliding portion by appropriately modifying the shape of the coater or coating conditions during electrode active material coating to prevent lithium precipitation on the tab side. However, there are limitations to controlling the electrode thickness while also considering other factors that can affect lithium precipitation, such as the N / P ratio, that is, the ratio of the anode to the cathode.

[0052] In addition, conventionally, a method was used in which foam pads were interposed at both ends of a battery cell stack in which multiple battery cells are stacked, and / or between the multiple battery cells. However, since it is difficult to achieve close contact between the positive and negative electrodes with a separator in between at the sliding part by merely interposing foam pads, it is difficult to effectively suppress the increase in resistance at the sliding part.

[0053] In this regard, Chinese Utility Model Publication No. 221057607 relates to an end plate for a battery, wherein the end plate for the battery comprises an internal support member, an external support member installed in a first direction of the internal support member, and an elastic member supported between the external support member and the internal support member, thereby effectively absorbing the expansion and displacement of the battery monomer and improving the performance and lifespan of the battery by the elastic member providing stable and uniform pressure to the battery cell through the internal support member. However, Chinese Utility Model Publication No. 221057607 only discloses a configuration that stably and uniformly applies pressure to the entire battery cell, and fails to present a technology for applying pressure such that the sliding part receives the same pressure as the center.

[0054] Considering these points, the present invention provides a technology that prevents or suppresses lithium precipitation and resistance increase by applying pressure to the sliding part formed on the tab side of the electrode so that it receives the same pressure as the center.

[0055] FIG. 1 is a front view of a pouch-type battery cell pressing member according to the present invention, FIG. 2 is a partial enlarged view of FIG. 1 (for example, FIG. 2 is an enlarged view of the second region of the first pressing part of FIG. 1), FIG. 3 is a perspective view of the lower pressing part of FIG. 1, and FIG. 4 is a graph showing the ratio of the thickness of the tab part side to the thickness of the center of the battery cell.

[0056] Referring to FIGS. 1 to 4, the pouch-type battery cell pressurizing member (300) according to the present invention comprises a first pressurizing member (100) comprising a first base plate (110), a first elastic member (120) whose first end is coupled to the first base plate (110), and a plurality of first contact portions (130) coupled to the second end of the first elastic member (120), and a second pressurizing member (200) comprising a second base plate (210), a second elastic member (220) whose first end is coupled to the second base plate (210), and a plurality of second contact portions (230) coupled to the second end of the second elastic member (220). A plurality of first contact portions (130) and a plurality of second contact portions (230) comprise a first region (A1) in which the pressing surface is substantially parallel to the first base plate (110) and the second base plate (210), and a second region (A2) in which the pressing surface is inclined with respect to the first base plate (110) and the second base plate (210).

[0057] In the present invention, the pressure surfaces of the plurality of first contact portions (130) and the plurality of second contact portions (230) are formed in an inclined shape in the second region (A2) so as to correspond to the inclination of the sliding portion (e.g., S in FIG. 5) of the pouch-type battery cell, so that the pressure applied to the center of the pouch-type battery cell can be applied to the sliding portion at the same level.

[0058] Additionally, in the second region (A2), the plurality of first contact portions (130) and the plurality of second contact portions (230) are formed such that the angle of inclination increases as they move toward both ends of the electric field direction (x) of the first base plate (110) or the second base plate (210). For example, considering that the angle of the sliding portion of the electrode increases as it moves toward both ends of the electric field direction (x), the second region (A2) that presses the sliding portion in a battery cell in which a plurality of electrodes are stacked is designed such that the angles of inclination (R1, R2, R3, R4, R5, R6) of the plurality of first contact portions (130) and the plurality of second contact portions (230) increase from R6 toward R1. Accordingly, the sliding portion can be pressed while the entire pressing surface of the plurality of first contact portions (130) and the plurality of second contact portions (230) is in close contact with the sliding portion.

[0059] The lengths (L1, L2, L3, L4, L5, L6) of the first elastic member (120) and the second elastic member (220) coupled to the plurality of first contact portions (130) and the plurality of second contact portions (230) may become longer towards both ends in the full length direction (x) of the first base plate (110) or the second base plate (210).

[0060] In order to make the force with which the first elastic member (120) and the second elastic member (220) press the pouch-type battery cell in the first region (A1) and the second region (A2) equal, the degree of compression of the first elastic members (121, 122, 123, 124, 125, 126) is equal. In addition, considering the reduction in thickness due to the sliding part of the pouch-type battery cell, the lengths (L1, L2, L3, L4, L5, L6) of the first elastic member (120) and the second elastic member (220) may be configured to increase from L6 to L1. When the lengths of the first elastic member (120) and the second elastic member (220) in the first region (A1) are configured to the level of the first elastic member (126) in the second region (A2) immediately adjacent to the first region (A1), the force applying pressure to the plurality of first contact parts (130) and the plurality of second contact parts (230) can be configured to be the same in the first region (A1) and the second region (A2).

[0061] Meanwhile, when the first elastic member (120) and the second elastic member (220) press the plurality of first contact portions (130) and the plurality of second contact portions (230), in order to stably press the pressing surfaces of the plurality of first contact portions (130) and the plurality of second contact portions (230) against the surface of the pouch-type battery cell, the plurality of first contact portions (130) and the plurality of second contact portions (230) are formed by combining elastic members (120, 220) arranged in two rows along the full width direction (y) of the first base plate (110) or the second base plate (210).

[0062] The width of the sliding portion may vary depending on the viscosity of the electrode composite slurry, the discharge amount of the coater coating the electrode composite slurry, the discharge speed, and the loading amount, and the number and width of the plurality of first contact portions (130) and the plurality of second contact portions (230) disposed in the second area may be determined by considering the width of the sliding portion. At this time, the width of the plurality of first contact portions (130) and the plurality of second contact portions (230) refers to a length parallel to the x-direction of FIGS. 1 and FIGS. 2.

[0063] For example, for each second area (A2) of the first pressure part (100) and the second pressure part (200), the number of first contact parts (130) and second contact parts (230) may be provided within the range of 3 to 10, and the width of the first contact parts (130) and second contact parts (230) may be configured to be about 2 mm to 5 mm.

[0064] For example, if the slope of the sliding part is steep, the number of contact parts tends to increase and the width tends to narrow, and if the slope of the sliding part is gentle, the number of contact parts tends to decrease and the width tends to widen.

[0065] Referring to FIG. 4, the thickness change from the outer periphery end to the center of a pouch-type battery cell is shown. When the thickness of the center is set to 100%, the thickness of the center is reached when it is about 20 mm or more away from the outer periphery end of the pouch-type battery cell. For example, the width of the sliding portion of the pouch-type battery cell can be seen as about 20 mm. FIG. 4 illustrates a part of the first pressing portion, but a shape symmetric to it can be applied to the second pressing portion.

[0066] In the case of FIG. 4, when the width of the plurality of first contact parts (130) and the plurality of second contact parts (230) in the second area (A2) is 3 mm, the plurality of first contact parts (130) and the plurality of second contact parts (230) can each be configured to include 6 of each.

[0067] Meanwhile, in order for the first pressure part (100) and the second pressure part (200) to uniformly press the entire outer surface of the pouch-type battery cell, the length (w) of the plurality of first contact parts (130) and the length (w) of the plurality of second contact parts (230) may be configured to be larger than the total width (length in the y-direction) of the pouch-type battery cell (10).

[0068] FIG. 5 is a front view of the pouch-type battery cell pressing member (300) of FIG. 1 pressing the pouch-type battery cell (10).

[0069] Referring to FIG. 5, the pouch-type battery cell pressing member (300) illustrated in FIG. 1 to 3 is placed on the outer surface of the pouch-type battery cell (10), and the center of the pouch-type battery cell (10) is omitted.

[0070] Generally, since the length and / or width of the cathode in the electrode assembly is made larger than the anode within a range of about 3 mm or less, the portion where the anode and cathode face each other substantially starts from the outermost part of the electrode assembly inward with a predetermined size (c).

[0071] Accordingly, the end of the first base plate (110) in the electric direction (x) and the end of the second base plate (210) in the electric direction (x), which are the parts pressed by the pouch-type battery cell pressing member (300), may be located inward by a predetermined size (c) compared to the outer periphery in the direction in which the electrode lead (11) of the pouch-type battery cell (10) protrudes, and the predetermined size (c) may be in the range of about 0 mm to 3 mm or less.

[0072] FIG. 6 is a vertical cross-sectional view of a battery module according to the present invention.

[0073] Referring to FIG. 6, the battery module comprises a plurality of pouch-type battery cells (10), a pouch-type battery cell pressurizing member (300) interposed between the plurality of pouch-type battery cells (10), and a module case (20) accommodating the plurality of pouch-type battery cells (10) and the pouch-type battery cell pressurizing member (300). The pouch-type battery cell pressurizing member (300) may be interposed one at a time in two or more locations among the plurality of pouch-type battery cells (10). However, the arrangement of the pouch-type battery cell pressurizing member (300) may be such that, for example, one at a time in one or more locations or one at a time in three or more locations, depending on the need.

[0074] The pouch-type battery cell pressurizing member (300) can be arranged so that the outer surface of the first base plate (110) where the first elastic member (120) is not attached and the outer surface of the second base plate (210) where the second elastic member (220) is not attached face each other.

[0075] FIG. 6 illustrates a state in which three pouch-type battery cell pressing members (300) are interposed between a plurality of pouch-type battery cells (10), but pouch-type battery cell pressing members (300) may also be interposed between the left end of the plurality of pouch-type battery cells (10) and the module case (20), and / or between the right end of the plurality of pouch-type battery cells (10) and the module case (20). In this case, the pouch-type battery cell pressing member (300) may be in a form that includes only the first pressing part (100) or the second pressing part (200).

[0076] Referring to FIG. 7, the present invention provides a method for pressurizing a pouch-type battery cell using the pouch-type battery cell pressurizing member (300), comprising a first step (S10) of placing a first pressurizing part (100) on the upper part of the pouch-type battery cell (10) and placing a second pressurizing part (200) on the lower part of the pouch-type battery cell (10), and a second step (S20) of pressing the first pressurizing part (100) and the second pressurizing part (200) toward the pouch-type battery cell (10), wherein the second step may involve pressing a first area (A1) and pressing a second area (A2) simultaneously. According to another embodiment, the pressing of the first area (A1) and the pressing of the second area (A2) in the second step may be performed with a time difference from each other.

[0077] According to one embodiment, the second step may proceed as a process of continuously applying uniform force to the entire first base plate (110) and the second base plate (210) for a period of about 2 seconds or more to 10 minutes or less, for example, continuously applying pressure for a period of about 10 seconds or more to 1 minute or less, or continuously applying pressure for a period of about 20 seconds or more to 30 seconds or less.

[0078] In addition, the second step above is performed by repeating the pressure application and pressure release two or more times, thereby increasing the adhesion between the positive and negative electrodes in the sliding part.

[0079] According to another embodiment, the second step may involve continuously applying pressure to the first region (A1) with a uniform force for a period of about 2 seconds or more to 10 minutes or less, and applying vibration to the second region (A2) while it is under pressure. For example, the pressure time of the first region (A1) and the second region (A2) may be about 10 seconds or more to 1 minute or less, and for example, about 20 seconds or more to 30 seconds or less.

[0080] The above vibration may be, for example, an ultrasonic vibration, and by applying such vibration, the pressure applied to the entire sliding part can be applied uniformly, thereby preventing or suppressing partial pressure imbalance in the sliding part.

[0081] A person skilled in the art to which the present invention pertains would be able to perform various applications and modifications within the scope of the present invention based on the above content.

[0082] In this specification, terms indicating directions such as up, down, left, right, front, and back have been used; however, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0083] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. A first base plate, a first elastic member having a first end coupled to the first base plate, and a first pressure member comprising a plurality of first contact portions coupled to a second end of the first elastic member, and A second pressure member comprising a second base plate, a second elastic member having a first end coupled to the second base plate, and a plurality of second contact portions coupled to the second end of the second elastic member, and A pouch-type battery cell pressing member comprising a plurality of first contact portions and a plurality of second contact portions, wherein the pressing surface comprises a first region in which the pressing surface is substantially parallel to the first base plate and the second base plate, and a second region in which the pressing surface is formed in a shape inclined with respect to the first base plate and the second base plate.

2. In Paragraph 1, In the above second region, the plurality of first contact portions and the plurality of second contact portions are, A pouch-type battery cell pressurizing member formed such that the angle of inclination increases toward both ends in the full-length direction of the first base plate or the second base plate.

3. In Paragraph 2, A pouch-type battery cell pressurizing member in which the lengths of the first elastic member and the second elastic member coupled to the plurality of first contact portions and the plurality of second contact portions become longer towards both ends in the full-length direction of the first base plate or the second base plate.

4. In Paragraph 1, A pouch-type battery cell pressurizing member in which the plurality of first contact portions and the plurality of second contact portions are combined with elastic members arranged in two rows along the full width direction of the first base plate or the second base plate.

5. In Paragraph 2, A pouch-type battery cell pressurizing member having the number of the plurality of first contact portions and the plurality of second contact portions in each of the second regions within the range of 3 to 10.

6. In Paragraph 1, A pouch-type battery cell pressing member in which the end of the first base plate in the full-length direction and the end of the second base plate in the full-length direction are located inwardly within a range of approximately 0 mm to 3 mm or less from the outer periphery in the direction in which the electrode lead of the pouch-type battery cell protrudes.

7. In Paragraph 1, A pouch-type battery cell pressurizing member having a plurality of first contact portions and a plurality of second contact portions with a width of about 2 mm to 5 mm.

8. In Paragraph 7, A pouch-type battery cell pressurizing member having a width of approximately 3 mm for the plurality of first contact portions and the plurality of second contact portions.

9. In Paragraph 1, A pouch-type battery cell pressing member in which the lengths of the plurality of first contact portions and the lengths of the plurality of second contact portions are configured to be larger than the full width of the pouch-type battery cell.

10. A battery module that accommodates a pouch-type battery cell pressurizing member according to any one of claims 1 to 9, Multiple pouch-type battery cells; The pouch-type battery cell pressing member interposed between the plurality of pouch-type battery cells; and A module case accommodating the plurality of pouch-type battery cells and the pouch-type battery cell pressurizing member; Includes, The above pouch-type battery cell pressurizing member is a battery module interposed at two or more locations among the plurality of pouch-type battery cells.

11. In Paragraph 10, The above pouch-type battery cell pressurizing member is a battery module in which the outer surface of the first base plate, on which the first elastic member is not attached, and the outer surface of the second base plate, on which the second elastic member is not attached, are arranged to face each other.

12. A method for pressurizing a pouch-type battery cell using a pouch-type battery cell pressurizing member according to any one of claims 1 to 9, wherein A first step of positioning a first pressurizing member on the upper part of a pouch-type battery cell and a second pressurizing member on the lower part of the pouch-type battery cell; and A second step of applying pressure to the first pressure part and the second pressure part toward the pouch-type battery cell; Includes, The above second step is a pouch-type battery cell pressurization method in which pressurization of the first region and pressurization of the second region are performed simultaneously.

13. In Paragraph 12, The above second step is a method for pressurizing a pouch-type battery cell, which proceeds as a process of continuously applying uniform force to the entire first base plate and the second base plate for a period of about 2 seconds or more to 10 minutes or less.

14. In Paragraph 13, The above second step is a pouch-type battery cell pressurization method performed by repeating pressurization and release two or more times.

15. In Paragraph 12, The above second step is a battery cell pressurization method in which the first region is continuously pressurized with a uniform force for a period of about 2 seconds or more to 10 minutes or less, and vibration is applied to the second region while it is pressurized.

16. In Paragraph 15, The above vibration is an ultrasonic vibration, a battery cell pressurization method.

Images