Battery cell pressure device

Abstract

The battery cell pressure device of the present invention includes a housing in which a plurality of battery cells are arranged side by side, a pressure plate arranged alternately with the battery cells and which heats and pressurizes the battery cells within the housing, and a pressure drive unit which drives the pressure plate to pressurize the battery cells, and is characterized in that the pressure plate has a plurality of pressure protrusions on the side facing the battery cells and heating wires attached to the pressure protrusions.

Description

[Technical field]

[0001] The present invention relates to a battery cell pressure device, and more particularly to a battery cell pressure device in which heating wires in a predetermined pattern are formed on a pressure plate that heats battery cells.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0128233 filed on September 28, 2021 and Korean Patent Application No. 10-2022-0118393 filed on September 20, 2022, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference. [Background technology]

[0003] Pouch-type lithium secondary batteries (hereinafter referred to as battery cells), which are the unit cells that make up a battery, are flexible and can be shaped relatively freely. They are also light in weight and safe, so demand for them as power sources for portable electronic devices such as mobile phones, camcorders, and laptop computers is increasing.

[0004] The battery cell is constructed by stacking a number of positive electrodes (aluminum foil) and negative electrodes (copper foil) with a separator between them, welding a positive electrode tab to the positive electrode and a negative electrode tab to the negative electrode, and then sealing the stack in an aluminum pouch.

[0005] The manufacturing process of such a battery cell can be roughly divided into three processes: electrode, assembly, and activation. The electrode process includes a process of preparing an electrode active material by mixing materials in an appropriate ratio, coating the electrode active material on a metal foil current collector, rolling the electrode through a roll press, and slitting the electrode to the size of the electrode.

[0006] In the assembly process, the electrode assembly is manufactured by stacking the positive electrode material, the separator, and the negative electrode material after notching to form the electrode tab, and the electrode assembly is housed in a battery case, and then an electrolyte is poured in to manufacture a battery cell (packaging cell).

[0007] The final activation process involves repeatedly charging and discharging the assembled battery cell to give it predetermined electrical characteristics.

[0008] When an electrolyte is introduced into a battery case in an assembly process prior to the activation process, the electrolyte is impregnated into the space between the electrodes and the separator of the laminated and joined electrode assembly. The impregnation of the electrolyte is necessary for the battery reaction. However, when the electrolyte is impregnated, the electrode assembly may swell, causing the gap between the positive electrode, the separator, and the negative electrode to widen. If the activation process is performed in this state, not only is the activation not performed properly, but the electrode assembly after the activation process may be bent and deformed.

[0009] For this reason, a pre-heating and pressurizing process is performed before the activation process, in which the battery case into which the electrolyte has been injected is heated and pressurized at a predetermined temperature and pressure. The electrode assembly swollen in the pre-heating and pressurizing process is then heated and pressurized, and the electrolyte is squeezed out of the gaps between the positive electrode, separator, and negative electrode. The electrodes and separator of the electrode assembly are then again brought into close contact with each other.

[0010] However, when the pressure plate heats and presses the entire surface of the battery cell in this heat and pressure process, the electrode and separator are tightly bonded, making it difficult for the electrolyte that has escaped to be re-impregnated. The electrode assembly needs to be re-attached for activation, but the specified electrolyte needs to be re-impregnated into the electrode assembly for the battery reaction of charging and discharging during activation.

[0011] Therefore, it is necessary to develop a technology that can tightly seal the electrode assemblies to provide them with the rigidity required for activation, while allowing the electrolyte to be re-impregnated through the gaps in the electrode assemblies. Summary of the Invention [Problem to be solved by the invention]

[0012] An object of the present invention is to provide a battery cell pressurizing device that can efficiently heat and pressurize an electrode assembly prior to a battery cell activation process to ensure the rigidity of the electrode assembly in the battery cell and produce a battery cell that can be re-impregnated with an electrolyte. [Means for solving the problem]

[0013] The battery cell pressurizing device of the present invention for solving the above problems includes a housing in which a plurality of battery cells are arranged side by side, a pressurizing plate arranged alternately with the battery cells to heat and pressurize the battery cells within the housing, and a pressurizing drive unit that drives the pressurizing plate to pressurize the battery cells. The pressurizing plate is characterized in that it has a plurality of pressurizing protrusions on a side facing the battery cells and heating wires attached to the pressurizing protrusions.

[0014] The pressure protrusion may be disposed at a predetermined interval in the up-down direction from one side of the pressure plate.

[0015] The pressure protrusions may be formed to extend in a line in the longitudinal direction of the pressure plate.

[0016] The pressure protrusions may be formed continuously in the longitudinal direction of the pressure plate or discontinuously at intervals along the longitudinal direction.

[0017] The pressure protrusions may be disposed on the pressure plate at equal intervals.

[0018] The pressure protrusions may be formed on both sides of the pressure plate.

[0019] The pressure protrusions may be provided on the upper and lower parts of the pressure plate so as to be capable of applying pressure to the upper and lower parts of the battery cell, respectively.

[0020] The cross section of the pressure protrusion may include at least one of a rectangle, a pentagon, a trapezoid, and an arch shape.

[0021] The spacing between the pressure projections may be at least 1.0 cm.

[0022] Based on the height direction of the pressure plate, the thickness of the end of the pressure protrusion may be 0.3 cm to 1.5 cm.

[0023] The end of the pressure projection may further include a protruding tip.

[0024] The hot wire may be provided at an end of the pressure protrusion so as to be exposed to the outside.

[0025] The temperature of the heat rays may be 50°C to 75°C.

[0026] The pressure protrusion may apply pressure to only 50% or less of the entire area of ​​the battery cell. Effect of the Invention

[0027] According to the present invention, a battery cell that can be re-impregnated with an electrolyte can be manufactured while ensuring the rigidity of the electrode assembly in the battery cell by efficiently heating and pressurizing the electrode assembly prior to the activation process of the battery cell.

[0028] In addition, the hot wire for heating the battery cell may be formed in a predetermined pattern to control the bonding area of ​​the electrode assembly, thereby improving the wetting of the electrolyte in the battery cell. [Brief description of the drawings]

[0029] [Figure 1] 1 shows a battery cell pressurizing device of the present invention. [Diagram 2] 1 shows a pressure plate included in a battery cell pressure device according to a first embodiment of the present invention, and a battery cell disposed opposite the pressure plate. [Diagram 3] 3A and 3B are a perspective view and a cross-sectional view of the pressure plate of FIG. 2. [Figure 4] 13 illustrates a pressure plate included in a battery cell pressure device according to a second embodiment of the present invention. [Diagram 5]13 shows a pressure plate included in a battery cell pressure device according to a third embodiment of the present invention. [Figure 6] 13 illustrates a pressure plate included in a battery cell pressure device according to a fourth embodiment of the present invention. [Figure 7] 7 shows the pressure plate of FIG. 6 and a battery cell disposed opposite the pressure plate. [Figure 8] 13 shows a pressure plate included in a battery cell pressure device according to a fifth embodiment of the present invention. [Figure 9] 13 illustrates a pressure plate included in a battery cell pressure device according to a sixth embodiment of the present invention. [Figure 10] 13 shows a pressure plate included in a battery cell pressure device according to a seventh embodiment of the present invention. [Figure 11] 13 illustrates a pressure plate included in a battery cell pressure device according to an eighth embodiment of the present invention. [Figure 12] 13 shows a pressure plate included in a battery cell pressure device according to a ninth embodiment of the present invention. [Figure 13] 13 shows a pressure plate included in a battery cell pressure device according to a tenth embodiment of the present invention. MODE FOR CARRYING OUT THEINVENTION

[0030] As described above, the present invention is characterized in that the battery cell 10 is pressed with a pressure plate 120 having pressure protrusions 122 and hot wires 121 in a predetermined pattern in order to adjust the bonding area and bonding path of the electrode assembly when the battery cell 10 is heated and pressurized, so as to ensure the rigidity of the electrode assembly in the battery cell 10 and enable re-impregnation of the electrolyte.

[0031] 1 shows a battery cell pressurizing device 100 of the present invention, which includes a housing 110 in which a plurality of battery cells 10 are arranged side by side, a pressurizing plate 120 arranged alternately with the battery cells 10 and which heats and pressurizes the battery cells 10 within the housing 110, and a pressurizing driver 130 which drives the pressurizing plate 120 to pressurize the battery cells 10. The pressurizing plate 120 is characterized by having a plurality of pressurizing protrusions 122 on a side surface facing the battery cells 10 and hot wires 121 provided on the pressurizing protrusions 122.

[0032] Referring to FIG. 1, the battery cell pressurizing device 100 of the present invention includes a housing 110 in which a plurality of battery cells 10 are arranged side by side.

[0033] It is sufficient for the housing 110 to have a structure that can protect and support the battery cells 10 and the pressure plate 120 and allows the battery cells 10 to be easily installed and removed.

[0034] The housing 110 has an open structure with two open sides, but is not limited thereto. In other words, the housing 110 may be configured as a closed structure in which the battery cell 10 can be installed inside through an entrance or the like.

[0035] There is no particular limit to the number of battery cells 10 provided within the housing 110.

[0036] The battery cell 10 may be, for example, a pouch-type cell in which an electrode assembly is housed in a pouch-type case.

[0037] The battery cells 10 are arranged in one direction inside the housing 110, so that the battery cells 10 can be heated and pressed from one side or both sides by a pressure plate 120, which will be described later.

[0038] The battery cell pressurizing device of the present invention includes a pressurizing plate 120 between the battery cells 10 for pressurizing the battery cells 10 .

[0039] The pressure plate 120 is configured as a rectangular plate corresponding to the shape of the battery cell 10 .

[0040] The material of the pressure plate 120 is not particularly limited, but since the pressure plate 120 contains a heating wire 121 as described later, it is necessary to use a material that easily conducts heat.

[0041] The pressure plate 120 is preferably larger than the area of ​​the battery cell 10 so as to prevent a phenomenon in which a desired area of ​​the battery cell 10 is not pressed. That is, the length and width of the pressure plate 120 are preferably larger than the length and width of the battery cell 10. Therefore, the pressure plate 120 can effectively pressurize and heat the battery cell 10 through the pressure protrusions 122 and the hot wires 121 provided on the surface of the pressure plate 120.

[0042] The pressure plate 120 is provided in the housing 110 so as to be movable relative to the battery cells 10 so as to be able to apply pressure to the battery cells 10. For example, it can move in a direction perpendicular to the arrangement direction of the battery cells 10.

[0043] The present invention also includes a driving unit for driving the pressure plate 120. FIG. 1 illustrates a pressure driving unit 130 and a driving arm 131 connected to the pressure driving unit 130. When a driving force is transmitted from the pressure driving unit 130 arranged on one side of the housing 110, the driving arm 131 performs a piston movement of a predetermined stroke to press the pressure plate 120. As a result, the battery cells 10 are pressed by the pressure plate 120 arranged therebetween. FIG. 1 illustrates a state in which the pressure plate 120 moves to press the battery cells 10. Since the pressure plate 120 is arranged between the battery cells 10, both sides of one battery cell 10 can be pressed by the pressure plates 120 on both sides of the one battery cell 10. The last battery cell 10 adjacent to the housing 110 among the arranged battery cells 10 has one side pressed by the pressure plate 120 and the other side pressed by the inner side of the housing 110. The form of the pressure drive unit 130, the length of the drive arm 131, the shape of the housing 110, and the like may be appropriately changed. The drive unit may be, for example, a servo motor. The drive arm 131 may be a ball screw that moves linearly upon receiving the rotational force of the drive unit. Alternatively, the drive arm 131 may be a piston cylinder mechanism that can be raised and lowered by air pressure or hydraulic pressure. In other words, the drive arm 131 and the drive unit are not particularly limited as long as they can move the pressure plate 120 horizontally relative to the battery cell 10.

[0044] Meanwhile, the pressure plate 120 may be stably guided during movement by a guide member (not shown). For example, both side walls may be provided on the housing 110, and guide portions for regulating both sides of the pressure plate 120 may be formed on the both side walls. Alternatively, a guide rail to which the upper and lower parts of the pressure plate 120 are coupled may be formed on the upper or lower part of the housing 110. Although FIG. 1 shows a form in which the battery cells 10 are exposed without an upper plate, an upper plate may be coupled onto the pressure plate 120, and a guide rail may be provided on the upper plate. Adding a guide mechanism to a pressure device having a drive arm 131 as shown in FIG. 1 is a known technique, and therefore further detailed description will be omitted.

[0045] The battery cell pressurizing device 100 of the present invention is mainly characterized in that it is provided with a pressurizing protrusion 122 formed to protrude from the side surface of the pressurizing plate 120 , and a hot wire 121 provided on the pressurizing protrusion 122 .

[0046] A more specific battery cell pressurizing device 100 of the present invention will be described in detail with reference to the embodiments and drawings.

[0047] (First embodiment) FIG. 2 shows a pressure plate 120 included in a battery cell pressure device 100 according to a first embodiment of the present invention, and a battery cell 10 arranged on one side of the pressure plate 120. As shown in FIG.

[0048] Referring to FIG. 2, the pressure plate 120 has a side surface, ie, a side surface facing the battery cell 10, on which a plurality of pressure protrusions 122 are provided.

[0049] The pressure plate 120 moves toward the battery cell 10 and presses one side of the battery cell 10 via the pressure protrusion 122 .

[0050] By the pressurization, the battery cell 10 is pressed along the shape of the pressurizing protrusion 122, so that the electrolyte membrane included in the electrode assembly inside the battery cell 10 may be tightly attached to the electrode.

[0051] 2, the pressure protrusions 122 are disposed at predetermined intervals in the up-down direction from one side of the pressure plate 120. That is, the pressure protrusions 122 disposed on the pressure plate 120 are not connected to each other. At this time, the pressure protrusions 122 are preferably disposed at equal intervals within an optimal interval range.

[0052] The pressure protrusion 122 included in the pressure plate 120 of the battery cell pressure device 100 according to the first embodiment of the present invention has a rectangular cross-sectional shape, and applies pressure to the battery cell 10 via the flat end of the pressure protrusion 122.

[0053] Referring to FIG. 2, the battery cell 10 pressed by the pressing plate 120 is pressed by the pressing protrusions 122 from four positions spaced apart at predetermined intervals in the vertical direction.

[0054] The pressure protrusions 122 are also formed to extend in parallel in the longitudinal direction of the pressure plate 120. In particular, the pressure protrusions 122 included in the pressure plate 120 of the battery cell pressure device 100 according to the first embodiment of the present invention are formed to be continuous and uninterrupted in the longitudinal direction of the pressure plate 120.

[0055] At this time, the pressing protrusion 122 may continuously press from one end to the other end of the battery cell 10. Therefore, the separator and the electrodes included in the battery cell 10 may be more stably bonded by the pressing protrusion 122 having the above-mentioned shape.

[0056] When the pressure plate 120 presses the battery cell 10, the pressure protrusion 122 presses only a specific area of ​​the battery cell 10. Specifically, it is preferable that the pressure protrusion 122 presses only 50% or less of the total area of ​​the battery cell 10. That is, it is preferable that the pressure plate 120 is formed with the pressure protrusion 122 so as to press only 50% or less of the total area of ​​the battery cell 10. At this time, if the pressure protrusion 122 presses more than 50% of the total area of ​​the battery cell 10, the content of the electrolyte re-impregnated into the separator of the electrode assembly may decrease, or many parts of the electrode assembly may be pressurized, which may result in a deterioration in battery performance.

[0057] It is preferable that the thickness of the end of the pressure protrusion 122 is adjusted so that the adhesive part is formed within a specific thickness range. Specifically, it is preferable that the thickness of the end of the pressure protrusion 122 is 0.3 cm to 1.5 cm based on the height direction of the pressure plate 120. At this time, if the thickness of the end of the pressure protrusion 122 is less than 0.3 cm, the effect of pressing the electrode assembly is small, and if it exceeds 1.5 cm, it becomes difficult for the electrolyte to be re-impregnated into the pressed part, so that the function of the battery may be deteriorated.

[0058] It is preferable to maintain a minimum distance between the pressure protrusions 122 formed on one side of the pressure plate 120. Specifically, it is preferable that the interval between the pressure protrusions 122 is at least 1.0 cm. If the interval between the pressure protrusions 122 is less than 1.0 cm, it may be difficult to re-impregnate the electrolyte between the adhesive joints formed by the pair of adjacent pressure protrusions 122.

[0059] FIG. 3 shows a cross section of the pressure plate 120 in FIG. 2 taken along the height direction of the pressure plate 120, and a heating wire 121 is provided inside the pressure protrusion 122. As shown in FIG.

[0060] The hot wire 121 serves to transfer high temperature heat from inside the pressure protrusion 122 to a portion of the battery cell 10 pressurized by the pressure protrusion 122. That is, a linear adhesive portion corresponding to the formation of the pressure protrusion 122 is formed in a portion of the electrode assembly inside the battery cell 10 pressurized by the pressure protrusion 122 and heated by the hot wire 121. That is, the hot wire 121 heats the inside of the electrode assembly to melt the adhesive component of the electrode, thereby bonding the electrode and the separator.

[0061] The adhesive parts may be formed on the electrode assembly at a predetermined interval in the up-down direction from the pressure plate 120 in accordance with the shape of the pressure protrusion 122 or the hot wire 121. Therefore, the electrolyte inside the battery cell 10 is squeezed into the space between the adhesive parts and moves to the space of the battery cell 10 case outside the electrode assembly. Then, the electrodes and the separator are adhered to each other with the adhesive parts at the center, and the electrode assembly swells due to the injection of the electrolyte, so that it can be re-adhered to recover its rigidity.

[0062] However, since the space between the adhesive portions is not heated by the hot wire 121, the electrolyte that has been squeezed and moved can move back into this space. That is, re-impregnation of the electrolyte is performed through this space. In this manner, the present invention enables re-impregnation of the electrolyte while recovering the adhesion of the electrode assembly by heating and pressurizing the electrode assembly with a plurality of hot wires 121 arranged at a distance from each other. Therefore, an electrode assembly having suitable rigidity can be efficiently activated in the activation process, and charging and discharging for activation can be appropriately performed by the re-impregnated electrolyte.

[0063] The hot wire 121 is maintained within a specific temperature range to obtain the desired effect without damaging the electrode assembly. Preferably, the hot wire 121 is at 50° C. to 75° C., and more preferably, the hot wire 121 is at 60° C. to 70° C. At this time, if the temperature of the hot wire 121 is less than 50° C., the adhesive joint may not be properly formed, and if it exceeds 75° C., the electrodes and the separator may be damaged due to high heat.

[0064] Second embodiment The hot wire 121 included in the pressure plate 120 of the battery cell pressure device 100 of the present invention may be in a form exposed to the outside. Specifically, the hot wire 121 may be provided at an end of the pressure protrusion 122.

[0065] FIG. 4 shows a cross section of a pressure plate 120 included in a battery cell pressure device 100 according to the second embodiment.

[0066] 4, the hot wire 121 is provided to be exposed to the outside from the end of the pressure protrusion 122. When the hot wire 121 is exposed to the outside like this, the efficiency of heat transfer is increased, so that the same effect by the hot wire 121 can be obtained even at a lower temperature.

[0067] Third embodiment The pressure protrusion 122 included in the pressure plate 120 of the battery cell pressure device 100 of the present invention may have a different shape other than the shape formed to extend along the longitudinal direction of the pressure plate 120.

[0068] FIG. 5 shows a pressure plate 120 included in a battery cell pressure device 100 according to a third embodiment of the present invention.

[0069] 5, the pressure protrusions 122 are formed intermittently at intervals along the longitudinal direction of the pressure plate 120. In this case, the adhesive portion of the electrode assembly may also be formed intermittently along the longitudinal direction of the battery cell 10. Therefore, the electrolyte may move through spaces where the adhesive portions are not continuous.

[0070] (Fourth embodiment) The pressure plate 120 of the battery cell pressure device 100 of the present invention can apply pressure to the battery cells 10 from both sides, and can simultaneously form adhesive portions on the electrode assemblies of each of the battery cells 10 .

[0071] FIG. 6 shows a pressure plate 120 included in a battery cell pressure device 100 according to a fourth embodiment of the present invention, in which (A) of FIG. 6 is an oblique view of the pressure plate 120, and (B) of FIG. 6 is a cross-sectional view showing a cross-section of the pressure plate 120 of (A) of FIG. 6 taken in the height direction of the pressure plate 120.

[0072] Referring to FIG. 6, the pressure plate 120 has pressure protrusions 122 formed on both sides thereof, and each pressure protrusion 122 is provided with a heating wire 121 .

[0073] 7 shows that the pressure plates 120 and the battery cells 10 of FIG. 6 are alternately arranged, and any one battery cell 10 can be pressed by the pressure plates 120 arranged opposite to each other on both sides. In this case, when pressing the battery cell 10 using the pressure plates 120, it is possible to press with less force, and also, it is possible to easily form an adhesive part on the electrode assembly included in the battery cell 10 by using the hot wires 121 of each of the pressure protrusions 122.

[0074] Therefore, if the battery cells 10 are pressurized and heated using the battery cell pressurizing device 100 according to the fourth embodiment, the process can be carried out more efficiently.

[0075] Fifth embodiment The pressure plate 120 of the battery cell pressure device 100 of the present invention may apply pressure to only two areas, the upper and lower areas, of the battery cell 10, respectively.

[0076] FIG. 8 shows a pressure plate 120 included in a battery cell pressure device 100 according to a fifth embodiment of the present invention, in which (A) of FIG. 8 is a perspective view of the pressure plate 120, and (B) of FIG. 8 is a cross-sectional view showing a cross-section of the pressure plate 120 of (A) of FIG. 8 taken in the height direction of the pressure plate 120.

[0077] 8, the pressure protrusions 122 are provided on the upper and lower parts of the pressure plate 120 so as to be able to apply pressure to the upper and lower parts of the opposing battery cells 10. In this case, each pressure protrusion 122 may be provided with a hot wire 121.

[0078] When the battery cell 10 is pressurized and heated via the pressure plate 120, adhesive parts are formed on the upper and lower parts of the electrode assembly, respectively.

[0079] The battery cell pressurizing device 100 according to the fifth embodiment has the effect of improving the degree of re-impregnation of the electrolyte by applying pressure to a relatively small area of ​​the entire area of ​​the battery cell 10.

[0080] Sixth embodiment The shape of the pressing protrusion 122 included in the pressing plate 120 of the battery cell pressing device 100 of the present invention may be modified in various ways as required.

[0081] FIG. 9 shows a pressure plate 120 of a battery cell pressure device 100 according to a sixth embodiment of the present invention, in which the cross-sectional shape of a pressure protrusion 122 included in the pressure plate 120 is pentagonal.

[0082] 9, the pressure protrusions 122 are provided on the pressure plate 120 such that the corners of the pentagon are located at the ends. Therefore, when the battery cell 10 is pressed by the pressure plate 120, strong force and heat can be transferred to a relatively narrow point, so that the efficiency of pressing and heating can be improved.

[0083] Seventh embodiment FIG. 10 shows a pressure plate 120 of a battery cell pressure device 100 according to a seventh embodiment of the present invention, in which a pressure protrusion 122 included in the pressure plate 120 has an arch-shaped cross section.

[0084] 10, the pressure protrusion 122 is provided on the pressure plate 120 such that the curved portion is located at the end. Therefore, when the battery cell 10 is pressed by the pressure plate 120, there is an effect that the risk of the electrode assembly being damaged by the pressing force can be reduced.

[0085] Eighth embodiment FIG. 11 shows a pressure plate 120 of a battery cell pressure device 100 according to an eighth embodiment of the present invention, and the pressure protrusion 122 included in the pressure plate 120 further includes a tip portion 122a protruding forward.

[0086] As shown in FIG. 11, a tip portion 122a included in a pressure plate 120 of a battery cell pressure device 100 according to an eighth embodiment of the present invention has a rectangular cross section.

[0087] The tip portion 122 a is formed to protrude from an end of the pressure protrusion 122 and can transmit pressure and heat to a narrower area of ​​the electrode assembly inside the battery cell 10 .

[0088] Ninth embodiment FIG. 12 shows a pressure plate 120 of a battery cell pressure device 100 according to a ninth embodiment of the present invention, in which the pressure protrusion 122 included in the pressure plate 120 further includes a tip portion 122a protruding forward.

[0089] The tip 122a included in the pressure plate 120 of the battery cell pressure device 100 according to the ninth embodiment of the present invention has an arch-shaped cross section as shown in Fig. 12. Here, the tip 122a is provided such that the curved portion faces the battery cell 10, thereby minimizing damage to the electrode assembly when the pressure plate 120 presses the battery cell 10.

[0090] The tip portion 122 a is formed to protrude from an end of the pressure protrusion 122 and can transmit pressure and heat to a narrower area of ​​the electrode assembly inside the battery cell 10 .

[0091] Tenth embodiment FIG. 13 shows a pressure plate 120 of a battery cell pressure device 100 according to the tenth embodiment of the present invention, in which the pressure protrusion 122 included in the pressure plate 120 further includes a tip portion 122a protruding forward.

[0092] The front end 122a included in the pressure plate 120 of the battery cell pressure device 100 according to the tenth embodiment of the present invention has a trapezoidal cross section as shown in Fig. 13. At this time, the front end 122a is provided such that a wider area faces the battery cell 10, and when the pressure plate 120 presses the battery cell 10, it can pressurize a wider area of ​​the electrode assembly and transfer heat.

Claims

1. a housing in which a plurality of battery cells are arranged side by side; a pressure plate arranged alternately with the battery cells to heat and pressurize the battery cells within the housing; a pressure driving unit that drives the pressure plate so as to apply pressure to the battery cell; the pressure plate has a plurality of pressure protrusions on a side surface facing the battery cells and hot wires attached to the pressure protrusions; The pressure protrusions are formed to extend in a line in the longitudinal direction of the pressure plate, The pressure protrusion is formed continuously in the longitudinal direction of the pressure plate.

2. The battery cell pressing device according to claim 1 , wherein the pressing protrusion is disposed at a predetermined distance from one side of the pressing plate in the vertical direction.

3. The battery cell pressure device according to claim 1 , wherein the pressure protrusions are disposed on the pressure plate at equal intervals.

4. The battery cell pressing device according to claim 1 , wherein the pressing protrusions are formed on both side surfaces of the pressing plate.

5. The battery cell pressing device according to claim 1 , wherein the pressing protrusions are provided on an upper portion and a lower portion of the pressing plate so as to press an upper portion and a lower portion of the battery cell, respectively.

6. The battery cell pressurizing device according to claim 1 , wherein a cross section of the pressurizing protrusion includes at least one of a rectangle, a pentagon, a trapezoid, and an arch shape.

7. The battery cell pressure device according to claim 1 , wherein the spacing between the pressure projections is 1.0 cm or more.

8. 2. The battery cell pressing device according to claim 1, wherein the thickness of the end of the pressing protrusion is 0.3 cm to 1.5 cm based on the height direction of the pressing plate.

9. The battery cell pressing device according to claim 1 , further comprising a protruding tip at an end of the pressing protrusion.

10. The battery cell pressurizing device according to claim 1 , wherein the hot wire is provided at an end of the pressurizing protrusion so as to be exposed to the outside.

11. 2. The battery cell pressurizing device according to claim 1, wherein the temperature of the hot wire is between 50°C and 75°C.

12. The battery cell pressurizing device according to claim 1 , wherein the pressurizing protrusion pressurizes only 50% or less of the entire area of ​​the battery cell.

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