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KR-102960720-B1 - Hybrid forming device for manufacturing secondary cell pouch

KR102960720B1KR 102960720 B1KR102960720 B1KR 102960720B1KR-102960720-B1

Abstract

The disclosed hybrid forming device for manufacturing a secondary battery pouch comprises: an air pressure forming means that supplies compressed air to the upper surface side of a pouch receiving portion and uses it as a forming pressure; a vacuum forming means that sucks in air from the lower surface side of a pouch receiving portion and uses vacuum pressure for forming when the pouch is formed; and a wrinkle prevention means that intervenes in the lower surface of a pouch receiving portion to prevent wrinkles from forming when the pouch forming is completed; wherein the air pressure forming means comprises: a compression portion that supplies compressed air to the upper surface side of a receiving portion of the pouch to be formed to provide forming pressure; and a punch portion formed to supply compressed air to the upper surface side of a receiving portion in contact with the lower surface of a punch; and the vacuum forming means comprises: a vacuum portion that sucks in air from the lower surface side of the pouch receiving portion to become a vacuum pressure; and a die portion formed to suck in air from the lower surface side of the pouch receiving portion to the outside; and the wrinkle prevention means comprises a buffer portion for preventing wrinkles from forming at the lower part of the pouch receiving portion; and may include a controller capable of controlling the forming device.

Inventors

  • 안혁
  • 이종신
  • 이상용

Dates

Publication Date
20260507
Application Date
20230704

Claims (20)

  1. In a hybrid forming device for manufacturing secondary battery pouches, An air pressure forming means (100) that supplies compressed air to the upper surface (Hu) of the pouch receiving portion (H) during pouch forming and uses it as a forming pressure; A vacuum forming means (200) that sucks air from the lower surface (Hd) side of the pouch receiving portion (H) during the above pouch forming process and uses vacuum pressure for forming; and A wrinkle prevention means (300) that intervenes on the lower surface (Hd) of the pouch receiving portion (H) to prevent wrinkles from forming when the above pouch forming is completed; wherein The above air pressure foaming means (100) is, A compression unit (120) that supplies compressed air to the upper surface (Hu) of the receiving portion (H) of the pouch to be formed to provide forming pressure; and a punch unit (110) formed to supply compressed air to the upper surface (Hu) of the receiving portion (H) that is in contact with the lower surface (111d) of the punch (111); wherein The punch (111) of the above punch section (110) is, It includes a plurality of flow paths (111b) formed inside the punch (111) to supply compressed air to the lower part of the punch (111) so that it can be used as a forming pressure by applying pressure to the upper surface (Hu) of the receiving part (H), and to discharge the compressed air from the lower part of the punch (111) to the outside. The above punch portion (110) is, A displacement sensor (115) for detecting the displacement (d1) between the upper surface (111c) of the punch groove (111a) and the upper surface (Hu) of the receiving portion (H) during forming and providing it to the controller (400); A pressure sensor (116) for detecting air pressure inside the punch groove (111a) and providing it to the controller (400); and A temperature sensor (117) for detecting the air temperature inside the punch groove (111a) and providing it to the controller (400); is installed as a built-in type and includes a smart function that transmits each detection data to the controller in real time during forming, The above vacuum forming means (200) is, A vacuum part (220) that sucks in air from the lower side (Hd) of the pouch receiving part (H) to create a vacuum pressure; A die portion (210) formed to suck air from the lower surface (Hd) side of the pouch receiving portion (H) to the outside; comprising, The above die (210) is, It includes a die plate (211) on which a forming groove (211a) is formed and a pouch film (S) to be formed is placed on top, and The above wrinkle prevention means (300) is, A cushioning portion (310) for preventing wrinkles from forming on the lower part (D) of the pouch receiving portion (H); comprising, The above buffer section (310) is, A cushioning plate (311) positioned in the forming groove (211a) of the die plate (211) and pressing the lower surface (Hd) where the receiving portion (H) is formed in the pouch film (S) so that wrinkles do not occur on the lower surface (D) of the receiving portion (H) when forming is complete; A damper unit (312) that absorbs the shock of the above buffer plate (311); and A hybrid forming device for manufacturing a secondary battery pouch, characterized by including a controller (400) that optimizes the forming depth by actively controlling the pressure, temperature, and supply amount of compressed air based on detection data received in real time from the displacement sensor (115), pressure sensor (116), and temperature sensor (117).
  2. In paragraph 1, The above punch portion (110) is, Compressed air is supplied to the lower part of the punch (111) to accommodate the compressed air required to form the pouch film (S), and to be used as a space for forming pressure. A punch (111) having a punch groove (111a) formed in a wide rectangular shape symmetrically with respect to the center of the lower surface of the punch (111), and having a displacement sensor (115), a pressure sensor (116), and a temperature sensor (117) installed on the upper surface (111c) to enable real-time detection; A servo pressure control valve (SV) that controls the pressure of compressed air supplied to the punch groove (111a) in real time according to a control signal from the controller (400); and A hybrid forming device for manufacturing a secondary battery pouch, characterized by including an air heater (HE) that heats compressed air supplied to the punch groove (111a) to increase the elongation rate of the pouch film, thereby significantly reducing friction and increasing tension in the lower part of the receiving portion to significantly improve the forming depth.
  3. In paragraph 1, The above punch portion (110) is, A punch body (112) having a plurality of passages (112a) formed in communication with the punch passage (111b) so as to be positioned above the punch (111) to support the punch (111), supply compressed air to the punch groove (111a), and discharge the compressed air of the punch groove (111a) to the outside; An upper base plate (113) positioned on the upper part of the punch body (112) to support the punch body (112), and having a plurality of flow paths (113a) formed in communication with the flow path (112a) of the punch body (112) to supply compressed air to the punch groove (111a) and discharge the compressed air from the punch groove (111a); and A hybrid forming device for manufacturing a secondary battery pouch, characterized by including: a shank (114) which is positioned and coupled to the upper part of the base plate (113) and has a T-shaped groove (114a) formed therein so as to be coupled to the T-shaped connecting part (15a) of the fixed shaft (15) of the main body part (10).
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  7. In paragraph 1, The above punch portion (110) is, After the forming is complete, When the die (210) descends, so as not to cause a pressure decrease due to a sudden increase in volume of the space between the lower part of the punch (111) and the upper surface (Hu) of the receiving part (H), A hybrid forming device for manufacturing a secondary battery pouch, characterized by including a plurality of passages (111b, 112a, 113a) formed in communication with the punch groove (111a) so that the interior of the punch groove (111a) communicates with the atmosphere.
  8. In paragraph 1, The above compression unit (120) is, Air is supplied into the above punch groove (111a), and An air compressor (121) that provides power to supply air to the plurality of pneumatic cylinders (33) above; A compression channel (122a) connected between the air compressor (121) and the punch section (110) to guide air to be supplied into the punch groove (111a); An air filter (123) for filtering out foreign substances from the air supplied to the above punch groove (111a); A first pressure gauge (124) showing the pressure inside the punch groove (111a); A first opening/closing valve (125) that selectively opens or closes the above-mentioned compression path (122a); A pressurizing path (122b) that branches off from the above compression path (122a) and guides air to be supplied to the above pneumatic cylinder (33); A regulator (126) that maintains the pressure supplied to the above pneumatic cylinder (33) at a set pressure; A second pressure gauge (127) showing the pressure of the air supplied to the above pneumatic cylinder (33); A third opening/closing valve (128) that selectively opens or closes the above-mentioned pressurized passage (122b); A hybrid forming device for manufacturing a secondary battery pouch, characterized by including a solenoid valve (129) that controls the rod (33a) of the pneumatic cylinder (33) to move forward or backward.
  9. In paragraph 8, The above compression unit (120) is, A hybrid forming apparatus for manufacturing a secondary battery pouch, characterized by further including an air heater (HE) to supply heated compressed air into the punch groove (111a) on the upper surface (Hu) side where a receiving portion (H) is to be formed in the pouch film (S) during the forming of the pouch film (S), thereby increasing the elongation rate of the pouch film (S) and improving moldability.
  10. In paragraph 1, The above compression part (120) is, Using the values detected by the above displacement sensor (115) and pressure sensor (116) A hybrid forming device for manufacturing a secondary battery pouch, characterized by further including a servo pressure control valve (SV) to control the pressure supplied into the punch groove (111a).
  11. In paragraph 8, The above compression unit (120) is, As soon as forming is completed, A hybrid forming device for manufacturing a secondary battery pouch, further comprising: a second opening/closing valve (AV1) such that the upper surface (Hu) side of the receiving portion (H) is connected to a plurality of passages (111b, 112a, 113a) of the punch portion (110) formed in communication with the punch groove (111a), so as to be opened or closed in a standby state.
  12. In paragraph 1, The above air pressure foaming means (100) is, When the air pressure provided from the above compression unit (120) is used for forming, the force (F) required for forming one quadrant can be defined by [Equation 1], and A hybrid forming device for manufacturing a secondary battery pouch, characterized in that the force (Fc) borne by the air pressure during the above pouch forming is Fc = Pc × (Ah + At), and the amount of friction reduction (Dfr1) is Dfr1 = u × Fc, so that the friction force is greatly reduced by the air pressure, thereby allowing the tension of the lower part (D) of the receiving portion (H) to be greatly increased and the forming depth (d3) of the pouch receiving portion (H) to be greatly increased. [Formula 1] F = Fc + Fp = Pc×(Ah + At) = Pc×Ah + Pc×At (Here, F represents the force in one quadrant required for forming, Fc represents the force borne by the air pressure, Fp represents the force borne by the punch, Pc represents the pressure required for forming, Ah represents the area of the punch groove (111a) in one quadrant, and At represents the area of the punch surface (111d) in one quadrant.)
  13. In paragraph 1, The above die (210) is, A die back plate (212) is installed in the forming groove (211a) such that the cushioning plate (311) of the buffering part (310) can be moved up and down by connecting it to a plurality of damper units (312), supports the lower surface of the die plate (211), and has one or more air passages (212a, 212b) formed up to the outer surface (212c) to suck air on the lower surface (Hd) side of the receiving part (H) to create a vacuum pressure during forming; A hybrid forming device for manufacturing a secondary battery pouch, characterized by including a lower base plate (213) that supports the lower surface of the die back plate (212) and has a precision guide shaft (41) installed vertically at each corner of the upper surface.
  14. In paragraph 1, The above vacuum section (220) is, A vacuum pump (221) that provides power to suck air on the lower side (Hd) where the receiving portion (H) is formed in the pouch film (S) through the gap (g1) between the buffer plate (311) and the die plate (211) and the flow paths (212a, 212b) formed in the die back plate (212); A suction path (222) connected between the vacuum pump (221) and the die back plate (212) to guide air from the lower surface (Hd) of the receiving portion (H) to be sucked in; A vacuum gauge (223) showing the pressure state on the lower side (Hd) of the above-mentioned receiving portion (H); A vacuum regulator (224) that maintains the pressure on the lower side (Hd) of the above-mentioned receiving portion (H) at a set vacuum pressure; A vacuum filter (225) that filters out foreign substances so that they do not enter the vacuum pump (221) during suction; A hybrid forming device for manufacturing a secondary battery pouch, characterized by including a fourth opening/closing valve (226) that selectively opens or closes the suction path (222).
  15. In Paragraph 14, The above vacuum section (220) is, As soon as forming is completed, A hybrid forming device for manufacturing a secondary battery pouch, further comprising: a fifth opening/closing valve (AV2) that can be opened or closed in a standby state, connected to a plurality of passages (212a, 212b) formed in the die back plate (212) communicating with the gap (g1) between the buffer plate (311) and the die plate (211) formed from the lower side (Hd) of the receiving portion (H).
  16. In paragraph 1, The above vacuum forming means (200) is, When the vacuum pressure provided from the above vacuum section (220) is used for forming, the force (F) in one quadrant required for forming can be defined as [Equation 2], and A hybrid forming device for manufacturing a secondary battery pouch, characterized in that the force (Fs) borne by the vacuum pressure during the above pouch forming is Fs = Ps × (Ah + At), and the amount of friction reduction (Dfr2) is Dfr2 = u × Fs, so that the friction is greatly reduced by the vacuum pressure, thereby allowing the tension of the lower part (D) of the receiving portion (H) to be greatly increased and the forming depth (d3) of the pouch receiving portion (H) to be greatly increased. [Equation 2] F = Fs + Fp = Ps×Ab + Fp = Ps×(Ah + At) + Fp(where F represents the force in one quadrant required for forming, Fs represents the force borne by the vacuum pressure, Fp represents the force borne by the punch, Ps represents the vacuum pressure, Ab represents the area of one quadrant of the receiving section, Ah represents the area of one quadrant of the punch groove (111a), and At represents the area of one quadrant of the punch surface (111d).)
  17. In paragraph 1, The above damper unit (312) is, The upper part contacts the lower surface of the buffer plate (311), and the lower part is configured to slide through the hole of the die back plate (212), A plurality of slide members (312a) that are coupled to the buffer plate (311) by passing a fastening member (312c) through the inner hollow portion (212e); It is positioned outside the central axis of the slide member (312a), and Located between the lower part of the buffer plate (311) and the upper part of the die back plate (212), A hybrid forming device for manufacturing a secondary battery pouch, characterized by including a plurality of elastic members (312b) that provide elastic force.
  18. In Paragraph 17, The above slide member (312a) is, To limit the rise of the above buffer plate (311), A hybrid forming device for manufacturing a secondary battery pouch, characterized in that a flange portion (a1) is formed on the side assembled to the lower part of the die back plate (212).
  19. In Paragraph 17, The above buffer plate (311) and the above die back plate (212) are, To prevent the elastic member (312b) from detaching during the assembly of the damper unit (312) and the replacement of the slide member (312a), A hybrid forming device for manufacturing a secondary battery pouch, characterized by having a surface (311a) formed on the lower part of the buffer plate (311) at the location where the elastic member (312b) is assembled, and a surface (212d) formed on the upper part of the die back plate (212).
  20. In Paragraph 17, The above damper unit (312) is, The distance (d2) from the upper surface of the die plate (211), which is the lower surface of the pouch film (S), to the upper surface of the buffer plate (311) can be adjusted by the length (h1) of the slide member (312a) according to the depth (d3) of the receiving portion (H) of the pouch being formed. When replacing the slide member (312a) with a new slide member (312a) of a changed length to adjust the above separation distance, With the fastening member (312c) positioned without detaching between the lower recessed surface (311a) of the buffer plate (311) and the upper recessed surface (212d) of the die back plate (212), The above fastening member (312c) is loosened so that the slide member (312a) to be replaced can be pulled out downwards, and the flange portion (a1) of the slide member (312a) is positioned at the bottom of the die back plate (212). A hybrid forming device for manufacturing a secondary battery pouch, characterized by being able to adjust the separation distance (d2) without disassembling the die (210).

Description

Hybrid forming device for manufacturing secondary cell pouch The present invention relates to a forming device, and more specifically, to a forming device for forming a receiving portion that accommodates a secondary battery electrode assembly, wherein the pressure of heated compressed air and the vacuum pressure of suction air are used in the forming operation, and temperature, pressure, and displacement data detected from a sensor are applied to the control to increase the forming depth without causing wrinkles or cracks at the corners of the forming portion, and the invention relates to a hybrid forming device for manufacturing a secondary battery pouch. According to market research firms, the secondary battery market is expected to expand significantly in the future due to the growth of the electric vehicle (EV) market and the medium-to-large energy storage battery market; it is projected that the secondary battery market will soon surpass the memory semiconductor market. In particular, the EV market is experiencing rapid growth as automotive regulations aimed at addressing climate change are being fully implemented; even during a period of sluggish global car sales due to the impact of COVID-19, the EV market recorded a growth rate exceeding 40% compared to previous levels. Furthermore, as modes of transportation such as electric scooters and bicycles are gradually becoming electrified, and as various applications utilizing secondary batteries—such as drones and delivery robots—are being developed, the industry is making a significant contribution to the creation of new industries and jobs. As such, the secondary battery industry is playing a role not only in production but also in fostering the emergence of new business models. The pouch film for forming according to the present invention is a composite film composed of nylon, aluminum foil, and polypropylene film, serving as an outer material for a lithium-ion polymer battery. A battery cell, comprising a positive electrode, a negative electrode, a separator, and an electrolyte, is embedded within the pouch film. The pouch film protects the battery cell from the outside while simultaneously maintaining the reliability of the battery. To embed the battery cell within the pouch film, a storage portion of a specific shape is formed; this process is called forming and corresponds to the process of forming the storage portion. In forming, the forming area and depth are proportional to the capacity of the battery. Recently, with the advancement to medium and large-sized batteries, there is a need to increase the forming area and depth, and accordingly, stable forming performance of the pouch film is required. However, when the punch is pressed during the forming process, complex deformations such as bending, tension, and elongation are concentrated at the punch and die shoulders, causing wrinkles and cracks to occur at the corners of the pouch film. Consequently, there are limitations in increasing the forming depth using conventional technology. Therefore, with the increase in battery capacity, there is an urgent need to develop a forming device capable of increasing the forming area and depth without causing wrinkles or cracks at the corners of the pouch. FIG. 1 is a perspective view illustrating the overall configuration of the device according to the present invention. FIGS. 2 and FIGS. 3 are partial cross-sectional views for explaining a forming device according to the present invention. FIGS. 4 and FIGS. 5 are partially exploded perspective views for explaining a forming device according to the present invention. FIG. 6 is a perspective view of a pouch formed using a forming device according to the present invention. FIGS. 7 to 11 are partial cross-sectional views for explaining the forming process according to the present invention. FIG. 12 is an enlarged cross-sectional view of a damper unit portion according to the present invention. FIGS. 13 and 14 are partial cross-sectional views for explaining a method for replacing a damper unit according to the present invention. FIG. 15 is a diagram illustrating the frictional force that hinders the tension of the pouch film during forming. FIG. 16 is a back view of a punch to explain the frictional force in a punch when only the punch is used. FIG. 17 is a cross-sectional view illustrating the frictional force in a pouch film when only a punch is used. FIG. 18 is a cross-sectional view illustrating the frictional force of a pouch film when using only another punch. FIG. 19 is a rear view of a punch to illustrate the frictional force in a punch in a forming device according to the present invention. FIG. 20 is a cross-sectional view illustrating the frictional force in a pouch film according to the pneumatic forming means of the present invention. FIG. 21 is a cross-sectional view illustrating the frictional force in a pouch film according to the vacuum forming means of the present invention. FIG. 22 is a c