Mold for manufacturing secondary battery and method for manufacturing all-solid-state secondary battery using the mold

Abstract

The present invention relates to a mold for manufacturing a secondary battery and a method of manufacturing an all-solid-state secondary battery using the same, the mold including: a first mold including a first sidewall portion disposed to surround a first accommodation space formed by making a central portion of the first mold concave inward, a first step portion formed to be concave inward from a surface of a (1a) sidewall member on both sides of the first sidewall portion in an overall length direction by a predetermined depth, and one or more injection holes; and a second mold including a second sidewall portion disposed to surround a second accommodation space formed by making a central portion of the second mold concave inward, a second step portion formed to be concave inward from a surface of a (2a) sidewall member on both sides of the second sidewall portion in an overall length direction by a predetermined depth, and one or more exhaust holes.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2025-0013431, filed on February 3, 2025, the disclosure of which is incorporated herein by reference in its entirety.

[0002] This invention relates to a mold for manufacturing secondary batteries and a method for manufacturing all-solid-state secondary batteries using the mold, and more specifically, to a mold for manufacturing secondary batteries configured to form the outer peripheral surface of a cell using a molding material and a method for manufacturing all-solid-state secondary batteries using the mold. Background Technology

[0003] With the technological advancements in mobile devices and the increasing demand for them, rechargeable and dischargeable batteries have been adopted as an energy source for various mobile devices. Rechargeable batteries are also gaining attention as an energy source for electric vehicles and hybrid electric vehicles, which are being proposed as alternatives to existing gasoline and diesel vehicles that use fossil fuels.

[0004] Currently available lithium-ion batteries use liquid electrolytes and have a structure where the negative and positive electrodes are separated by a separator. Therefore, if the separator is damaged due to deformation or external impact, a short circuit may occur, leading to risks such as overheating or explosion.

[0005] Therefore, all-solid-state batteries using solid electrolytes instead of liquid electrolytes have been proposed. All-solid-state batteries offer higher safety than lithium-ion batteries using liquid electrolytes, and improve battery reliability by preventing electrolyte leakage.

[0006] However, all-solid-state batteries using solid electrolytes have the following problems: compared with liquid electrolytes, solid electrolytes have lower ionic conductivity, especially at low temperatures, exhibiting degraded output characteristics, making it difficult to form a uniform contact interface between the electrode and the solid electrolyte membrane, and resulting in poor contact with the electrode active material, thus leading to increased resistance.

[0007] To address the aforementioned issues, an isostatic pressing process is typically performed to achieve interfacial bonding between the electrode and the solid electrolyte.

[0008] Typically, the manufacturing process of all-solid-state batteries is very complex because: each cell, formed by sequentially stacking a negative electrode, a solid electrolyte membrane, and a positive electrode, is pre-packaged using aluminum bags, undergoes an isostatic pressing process, and is then unpacked to determine if the cell has any defects; moreover, only the cells that are determined to be good are selected and stacked again before the main packaging is performed.

[0009] In particular, during the isostatic pressing process of the cell unit, which involves pressing the cell unit under extremely high pressure, defects such as edge cracking or bending of the positive or negative electrode may occur due to space and stacking errors caused by the difference in width or length between the negative and positive electrodes. As a result, the defect rate of the cell unit is relatively high during the isostatic pressing process.

[0010] (Existing technical documents)

[0011] (Patent Document 1) Korean Patent Application Publication No. 10-2024-0052314 Summary of the Invention

[0012] Technical issues

[0013] The present invention was made in view of the above-mentioned problems, and the object of the present invention is to provide a mold for manufacturing secondary batteries that can reduce the defect rate of cell units during the isostatic pressing process, and a method for manufacturing all-solid-state secondary batteries using the mold.

[0014] Another object of the present invention is to provide a mold for manufacturing a secondary battery that can further simplify the manufacturing method of an all-solid-state secondary battery, and a method for manufacturing an all-solid-state secondary battery using the mold.

[0015] Technical solution

[0016] As a technical means to achieve the above-mentioned objective, a mold for manufacturing a secondary battery according to an embodiment of the present invention includes: a first mold (110), the first mold (110) including a first sidewall portion (111), a first stepped portion (112) and at least one injection hole (113), the first sidewall portion (111) being configured to be recessed inward around the central portion of the first mold (110) to form a first receiving space (S1), the first stepped portion (112) being formed as a sidewall member 1a from each of the two sides disposed on the first sidewall portion (111) in the overall length direction (S1). 111a) has one surface recessed inward to a predetermined depth; and a second mold (120) including a second sidewall portion (121), a second step portion (122) and at least one vent (123), the second sidewall portion (121) being configured to form a second receiving space (S2) formed by recessing inward through the central portion of the second mold (120), the second step portion (122) being formed to be recessed inward to a predetermined depth from one surface of a 2a sidewall member (121a) disposed on each of the two sides of the second sidewall portion (121) in the overall length direction.

[0017] Furthermore, in the mold for manufacturing a secondary battery according to the embodiment of the present invention, the first step portion (112) can extend from the first receiving space (S1) and can have a recess depth that is less than the recess depth of the first receiving space (S1).

[0018] Furthermore, in the mold for manufacturing a secondary battery according to the embodiment of the present invention, the length of the first step portion (112) in the overall width direction may be less than the length of the first accommodating space (S1) in the overall width direction.

[0019] Furthermore, in the mold for manufacturing a secondary battery according to the embodiment of the present invention, the second step portion (122) can extend from the second receiving space (S2) and can have a recess depth that is less than the recess depth of the second receiving space (S2).

[0020] Furthermore, in the mold for manufacturing a secondary battery according to the embodiment of the present invention, the length of the second step portion (122) in the overall width direction may be less than the length of the second accommodating space (S2) in the overall width direction.

[0021] Furthermore, in the mold for manufacturing a secondary battery according to the embodiment of the present invention, a plurality of injection holes (113) may be provided, and a plurality of vent holes (123) may be provided.

[0022] In addition, the all-solid-state secondary battery manufacturing method using the mold for manufacturing a secondary battery according to the embodiment of the present invention includes: (S1) accommodating at least one cell (10) in a first accommodating space (S1); (S2) placing a second mold (120) on the first mold (110); (S3) injecting a liquid first molding material (210) through an injection hole (113); and (S4) thermally curing the first molding material (210).

[0023] Furthermore, in the all-solid-state secondary battery manufacturing method according to the embodiment of the present invention, in step (S3), the first molding material (210) can be injected into the receiving space (S) at a predetermined pressure through a plurality of injection holes (113).

[0024] Furthermore, the all-solid-state secondary battery manufacturing method according to the embodiment of the present invention may further include: placing a second molding material (220) in a semi-cured state in a first accommodating space before step (S1).

[0025] Furthermore, in the all-solid-state secondary battery manufacturing method according to the embodiments of the present invention, the second molding material may be semi-solid particles.

[0026] Furthermore, in the all-solid-state secondary battery manufacturing method according to the embodiment of the present invention, the particles may be spherical.

[0027] Furthermore, in the all-solid-state secondary battery manufacturing method according to the embodiment of the present invention, the second molding material (220) may include a grid frame having multiple intersections, and the particles may be disposed at each of the multiple intersections.

[0028] Furthermore, in the all-solid-state secondary battery manufacturing method according to the embodiments of the present invention, each of the first molding material (210) and the second molding material (220) may be a thermosetting resin.

[0029] Furthermore, in the all-solid-state secondary battery manufacturing method according to the embodiment of the present invention, in step (S1), multiple stacked cell units (10) can be accommodated.

[0030] Furthermore, the all-solid-state secondary battery manufacturing method according to the embodiments of the present invention may further include: after step (S4), isostatic pressing is applied to the all-solid-state secondary battery formed from the first molding material (210).

[0031] Beneficial effects

[0032] As is evident from the above description, in the mold for manufacturing secondary batteries according to the present invention and the method for manufacturing all-solid-state secondary batteries using the mold, molding material is injected through the injection hole of the mold in which the cell is contained, so that all spaces including the outer surface of the cell are filled with the molding material. Therefore, the cell can be pressed evenly during the isostatic pressing process, which helps to reduce the defect rate caused by bending or damage.

[0033] Furthermore, in the mold for manufacturing a secondary battery according to the present invention and the method for manufacturing an all-solid-state secondary battery using the mold, the molding material covers the entire outer surface of the cell, so that a portion of the tab of the cell is exposed to the outside, thereby preventing moisture from seeping in from the outside.

[0034] Furthermore, in the mold for manufacturing secondary batteries according to the present invention and the method for manufacturing all-solid-state secondary batteries using the mold, the depackaging step and the main packaging step can be omitted, thereby reducing manufacturing time and cost. Attached Figure Description

[0035] Figure 1 This is an exploded perspective view showing a mold for manufacturing a secondary battery according to the present invention.

[0036] Figure 2 This is a perspective view showing the first mold constituting a mold for manufacturing a secondary battery according to the present invention.

[0037] Figure 3 This is a perspective view showing the second mold constituting the mold for manufacturing a secondary battery according to the present invention.

[0038] Figure 4 This is a cross-sectional view showing a mold for manufacturing a secondary battery according to the present invention.

[0039] Figure 5 This is a perspective view showing an all-solid-state secondary battery manufactured by the all-solid-state secondary battery manufacturing method according to the present invention.

[0040] Figure 6 It is along Figure 5 The sectional view taken by line AA.

[0041] Figure 7 This is a cross-sectional view showing the state in which a cell is housed in the housing space of a mold for manufacturing a secondary battery, as a method for manufacturing an all-solid-state secondary battery according to a first embodiment of the present invention.

[0042] Figure 8 This shows the first molding material through Figure 7 The diagram shows a cross-sectional view of the injection hole of a mold for manufacturing secondary batteries, in which the injection cavity is filled into the receiving space.

[0043] Figure 9 This is a top view showing the state in which the second molding material is placed on the first mold constituting the mold for manufacturing a secondary battery, as viewed from above, in a method for manufacturing an all-solid-state secondary battery according to a second embodiment of the present invention.

[0044] Figure 10 This is a cross-sectional view showing the state in which the second molding material and the cell are contained in an all-solid-state secondary battery manufacturing method according to a second embodiment of the present invention.

[0045] Figure 11 This shows the first molding material through Figure 10 The diagram shows a cross-sectional view of the injection hole of a mold for manufacturing secondary batteries, in which the injection cavity is filled into the receiving space.

[0046] Figure 12 This is a top view showing the state in which the second molding material is placed on the first mold constituting the mold for manufacturing a secondary battery, as viewed from above, in a method for manufacturing an all-solid-state secondary battery according to a third embodiment of the present invention.

[0047] Figure 13 This is a cross-sectional view showing the state in which the second molding material and the cell are contained in an all-solid-state secondary battery manufacturing method according to a third embodiment of the present invention.

[0048] Figure 14 This shows the first molding material through Figure 13 The diagram shows a cross-sectional view of the injection hole of a mold for manufacturing secondary batteries, in which the injection cavity is filled into the receiving space.

[0049] Figure 15 This is a perspective view showing a portion of the sealing material configured to enclose a tab portion placed on the 1b step portion of a secondary battery manufacturing mold according to the present invention. Detailed Implementation

[0050] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement these preferred embodiments. However, in describing the working principle of the preferred embodiments of the present invention, detailed descriptions of known functions and structures incorporated herein will be omitted where such descriptions might obscure the subject matter of the invention.

[0051] Furthermore, the same reference numerals will be used throughout the drawings to denote components that perform similar functions or operations. Throughout the specification, when one component is referred to as being connected to another component, the one component can be directly connected to the other component, or indirectly connected to the other component via yet another component. Additionally, including predetermined elements does not imply the exclusion of other elements, but rather means that these elements may be included unless otherwise specified.

[0052] The following describes a mold for manufacturing a secondary battery according to the present invention, and a method for manufacturing an all-solid-state secondary battery using the mold.

[0053] Figure 1 This is an exploded perspective view showing a mold for manufacturing a secondary battery according to the present invention, and Figure 2 This is a perspective view showing the first mold constituting a mold for manufacturing a secondary battery according to the present invention. Additionally, Figure 3 This is a perspective view showing the second mold constituting the mold for manufacturing a secondary battery according to the present invention, and Figure 4 This is a cross-sectional view showing a mold for manufacturing a secondary battery according to the present invention.

[0054] Reference Figures 1 to 4 The mold 100 for manufacturing secondary batteries according to the present invention includes a first mold 110 and a second mold 120.

[0055] First, the first mold 110 may include: a first receiving space S1, the first receiving space S1 being configured to receive at least one unit cell 10; a first sidewall portion 111; a first step portion 112; and at least one injection hole 113.

[0056] The first receiving space S1 can be located inward from the center of the first mold 110 ( Figure 2The space is formed by a recess (at the 6 o'clock position). In this case, the first receiving space S1 may have a recess depth corresponding to at least half the height of the cell 10, so that the at least one cell 10 can be received in the first receiving space S1. For example, the first receiving space S1 may be recessed to have a depth equal to or greater than the height from the lower surface of the cell 10 to the tab 11.

[0057] The first sidewall portion 111 may include: a pair of 1a sidewall members 111a, the pair of 1a sidewall members 111a being oriented along the overall length direction ( Figure 2 The unit cell 10 housed in the first receiving space S1 is disposed on both sides of the unit cell 10 in the X-axis direction; and a pair of 1b sidewall members 111b, the pair of 1b sidewall members 111b being disposed on both sides of the unit cell 10 in the first receiving space S1 in the overall width direction. Figure 2 The first sidewall portion 111 is disposed on both sides of the unit cell 10 in the Z-axis direction, and the first sidewall portion 111 can surround the first receiving space S1.

[0058] In this case, the first step portion 112 can be recessed inward to a predetermined depth from one surface of the 1a sidewall member 111a. The first step portion 112 can extend from the first receiving space S1 so that the tab portion 11 of the cell 10 housed in the first receiving space S1 can be housed in the first step portion 112.

[0059] Alternatively, the first step portion 112 can be configured such that the tab portion 11 of the cell 10 housed in the first receiving space S1 can be housed within the first step portion 112. In this case, the first step portion 112 can be a space for molding the tab portion 11, such that during the molding process of the cell 10, a portion of the tab portion 11 is wrapped with molding material.

[0060] The first step portion 112 may include: a step portion 112a, on which a portion of the tab portion 11, which is covered by molding material, is disposed; and a step portion 112b, on which another portion of the tab portion 11 is disposed, so as not to be exposed to the molding material.

[0061] The 1a step portion 112a may have a recess depth that is less than the recess depth of the first receiving space S1. In this case, the 1a step portion 112a may be formed to correspond to the height and position of the tab portion 11.

[0062] Furthermore, the width of the 1a step portion 112a can be smaller than the length of the first receiving space S1 in the overall width direction. For example, the width of the 1a step portion 112a can be set such that the tab portion 11 of the cell 10 is received in the 1a step portion, and the 1a step portion has an area capable of filling with molding material, so as to use the molding material to wrap a portion of the tab portion 11. However, the width of the 1a step portion 112a can be smaller than the length of the cell 10 in the overall width direction.

[0063] The extension length of the 1a step portion 112a in the overall length direction may be less than the extension length of the 1a side wall member 111a in the overall length direction.

[0064] The 1b step portion 112b can extend from the 1a step portion 112a along its overall length, such that a portion of the tab 12 not covered by the molding material is placed on the 1b step portion 112b. In this case, the 1b step portion 112b can have a recess depth corresponding to half the thickness of the tab 12 and a width corresponding to the width of the tab 12, such that no molding material is injected when the tab 12 is accommodated.

[0065] The first step portion 112 may be formed on each of the pair of 1a sidewall members 111a; however, the invention is not limited thereto, and both first step portions 112 may be formed on either of the pair of 1a sidewall members 111a.

[0066] The at least one injection hole 113 may be formed in a first mold 110 having a first receiving space S1. For example, one injection hole 113 may be formed at the center of the first mold. As another example, multiple injection holes 113 may be formed at the center of the first mold and along the edge of the first mold. As shown, a total of six injection holes 113 may be formed along the edge of the first mold; however, the invention is not limited thereto.

[0067] The injection hole 113 is configured to communicate with the external space and the first receiving space S1 through the injection hole 113, and the molding material can be injected into the first receiving space S1 through the injection hole.

[0068] The second mold 120 may include: a second receiving space S2 configured to receive at least one cell 10; a second sidewall portion 121; a second step portion 122; and at least one vent 123.

[0069] The second receiving space S2 can be located inward from the center of the second mold 120 ( Figure 3The space is formed by a recess (at the 6 o'clock position). In this case, the second receiving space S2 may have a recess depth corresponding to at least half the height of the cell 10, so that the at least one cell 10 can be received in the second receiving space. For example, the second receiving space S2 may be recessed to have a depth equal to or greater than the height from the upper surface of the cell 10 to the tab 11.

[0070] When the second mold 120 is placed on the first mold 110, the second receiving space S2 can communicate with the first receiving space S1 to form the receiving space S. In this case, the cell 10 can be received in the receiving space S.

[0071] The second sidewall portion 121 may include: a pair of 2a sidewall members 121a, the pair of 2a sidewall members 121a being oriented along the overall length direction ( Figure 3 The unit cell 10 is disposed on both sides of the cell 10 housed in the second housing space S2 in the X-axis direction; and a pair of 2b sidewall members 121b, the pair of 2b sidewall members 121b being disposed on both sides of the cell 10 in the second housing space S2 in the overall width direction. Figure 3 The second sidewall portion 121 is disposed on both sides of the unit cell 10 in the Z-axis direction, and the second sidewall portion 121 can surround the second receiving space S2.

[0072] In this case, the second step portion 122 can be recessed inward to a predetermined depth from one surface of the 2a sidewall member 121a. The second step portion 122 can extend from the second receiving space S2, so that the tab portion 11 of the cell 10 housed in the second receiving space S2 can be housed in the second step portion 122.

[0073] Alternatively, the second step portion 122 can be configured such that the tab portion 11 of the cell 10 housed in the second housing space S2 can be housed within the second step portion 122. In this case, the second step portion 122 can be a space for molding the tab portion 11, such that during the molding process of the cell 10, a portion of the tab portion 11 is wrapped with molding material.

[0074] The second step portion 122 may include: a 2a step portion 122a, on which a portion of the tab portion 11, which is covered by molding material, is disposed; and a 2b step portion 122b, on which another portion of the tab portion 11 is disposed, thereby not being exposed to the molding material.

[0075] The 2a step portion 122a may have a recess depth that is less than the recess depth of the second receiving space S2. In this case, the 2a step portion 122a may be formed to correspond to the height and position of the tab portion 11.

[0076] Furthermore, the width of the 2a step portion 122a can be smaller than the length of the second accommodating space S2 in the overall width direction. For example, the width of the 2a step portion 122a can be set such that the tab portion 11 of the cell 10 is accommodated in the 2a step portion, and the 2a step portion has an area capable of filling with molding material, so as to use the molding material to wrap a portion of the tab portion 11. However, the width of the 2a step portion 122a can be smaller than the length of the cell 10 in the overall width direction.

[0077] The extension length of the 2a step portion 122a in the overall length direction may be less than the extension length of the 2a side wall member 121a in the overall length direction.

[0078] The 2b step portion 122b can extend from the 2a step portion 122a along the overall length direction, such that a portion of the tab 12 not covered by the molding material is placed on the 2b step portion 122b. In this case, the 2b step portion 122b can have a recess depth corresponding to half the thickness of the tab 12 and a width corresponding to the width of the tab 12, such that no molding material is injected when the tab 12 is accommodated.

[0079] The second step portion 122 can be configured such that when the second mold 120 is placed on the first mold 110, the 2a step portion 122a and the 1a step portion 112a communicate with each other, thereby allowing the molding material to wrap around a portion of the tab portion 11 contained in the space between them, and the 2b step portion 122b and the 1b step portion 112a communicate with each other, thereby preventing the other portion of the tab portion 11 contained in the space between them from being exposed to the molding material.

[0080] Furthermore, the 2b step portion 122b and the 1b step portion 112a can extend to the end of the 2a sidewall member 121a and the end of the 1a sidewall member 111a, respectively, thereby allowing a portion of the tab portion 11 to be exposed to the outside.

[0081] The second step portion 122 may be formed on each of the pair of 2a sidewall members 121a; however, the invention is not limited thereto, and the two first step portions 112 may be formed on either of the pair of 2a sidewall members 121a.

[0082] The at least one vent 123 can be formed in the second mold 120 having the second receiving space S2. For example, one vent 123 can be formed at the center of the second mold. As another example, multiple vents 123 can be formed at the center of the second mold and along the edge of the second mold. As shown, a total of six vents 123 can be formed along the edge of the second mold; however, the invention is not limited thereto.

[0083] The vent 123 is configured to communicate with the external space and the second receiving space S2 via the vent 123, and when the molding material is injected into the receiving space S, the air in the receiving space S can be discharged through the vent.

[0084] Figure 5 This is a perspective view showing an all-solid-state secondary battery manufactured by the all-solid-state secondary battery manufacturing method according to the present invention, and Figure 6 It is along Figure 5 The sectional view taken by line AA. Additionally, Figure 7 This is a cross-sectional view showing a cell housed in the receiving space of a mold for manufacturing a secondary battery, as per the first embodiment of the all-solid-state secondary battery manufacturing method according to the present invention. Figure 8 This shows the first molding material through Figure 7 The diagram shows a cross-sectional view of the injection hole of a mold for manufacturing secondary batteries, in which the injection cavity is filled into the receiving space.

[0085] Reference Figures 1 to 8 The all-solid-state secondary battery manufacturing method according to the first embodiment of the present invention, using the secondary battery manufacturing mold 100 according to the present invention, includes: (S1) a step of accommodating at least one cell 10 in a first accommodating space S1; (S2) a step of placing a second mold 120 on a first mold 110; (S3) a step of injecting a liquid first molding material 210 through an injection hole 113; and (S4) a step of thermally curing the first molding material 210.

[0086] The cell housed in the first accommodating space S1 can be configured such that the negative electrode, solid electrolyte, and positive electrode are stacked in sequence. In this case, the length of the positive electrode can be less than the length of the negative electrode.

[0087] The positive electrode comprises a positive current collector and a positive active material applied to each of the upper and lower surfaces of the positive current collector. The positive active material may be mixed with conductive agents and binders, and fillers may be further added as needed.

[0088] Typically, the positive electrode current collector can have a thickness ranging from 3 μm to 500 μm. There are no particular limitations on the positive electrode current collector, as long as it exhibits high conductivity and does not cause any chemical changes in the battery in which it is used. For example, the positive electrode current collector can be made of stainless steel, aluminum, nickel, titanium, or sintered carbon. Alternatively, it can be made of aluminum or stainless steel with a surface treated with carbon, nickel, titanium, or silver. Furthermore, the positive electrode current collector can have microscale uneven patterns formed on its surface to increase the adhesion of the positive electrode active material, or it can be constructed in any of the following forms: film, sheet, foil, mesh, porous body, foam, and nonwoven fabric.

[0089] The following substances can be used as positive electrode active materials: layered compounds, such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2), or compounds substituted with one or more transition metals; compounds with the chemical formula Li 1+x Mn 2-x Lithium manganese oxides represented by O4 (where x = 0 to 0.33), or lithium manganese oxides such as LiMnO3, LiMn2O3, or LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, or Cu2V2O7; and lithium oxides with the chemical formula LiNi 1-x M x Ni-site lithium nickel oxide represented by O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x = 0.01 to 0.3); LiMn 2-x M x Lithium manganese composite oxides represented by O2 (where M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1) or the chemical formula Li2Mn3MO8 (where M = Fe, Co, Ni, Cu or Zn); LiMn2O4 in which a portion of the Li in the chemical formula is replaced by alkaline earth metal ions; disulfide compounds; or Fe2(MoO4)3; however, the invention is not limited thereto.

[0090] The negative electrode includes a negative electrode current collector and a negative electrode active material applied to each of the upper and lower surfaces of the negative electrode current collector. The negative electrode active material can also be mixed with a conductive agent and a binder, and the mixture can be used to coat the negative electrode current collector.

[0091] Negative electrode current collectors are typically manufactured with a thickness ranging from 3 μm to 500 μm. There are no particular limitations on the type of negative electrode current collector, as long as it exhibits high conductivity and does not cause any chemical changes in the battery in which it is used. For example, the negative electrode current collector can be made of copper, stainless steel, aluminum, nickel, titanium, or sintered carbon. Alternatively, it can be made of copper or stainless steel, or an aluminum-cadmium alloy, with a surface treated with carbon, nickel, titanium, or silver. Furthermore, in the same manner as the positive electrode current collector, the negative electrode current collector can have microscale uneven patterns formed on its surface to increase the adhesion of the negative electrode active material, or it can be constructed in any of the following forms: film, sheet, foil, mesh, porous body, foam, and nonwoven fabric.

[0092] Meanwhile, each of the negative current collector and the positive current collector includes a portion to which a slurry mixture containing active materials is applied and an uncoated portion, wherein the uncoated portion is the portion to which no slurry mixture is applied, wherein the uncoated portion is cut to form an electrode tab, or individual conductive components are connected to the uncoated portion by ultrasonic welding to form an electrode tab, and multiple electrode tabs are brought together to form a tab bundle.

[0093] Furthermore, in step (S1), when the at least one cell 10 is housed in the first housing space S1, a portion of the tab portion 11 of the at least one cell 10 can be housed in the space formed by the first step portion 112.

[0094] At this time, a portion of the tab 11 to be covered by the molding material can be placed on the step 1a 112a, and the other portion of the tab that is not to be exposed to the molding material can be placed on the step 1b 112b, or contained in the space formed by the first step 112 to be exposed to the outside.

[0095] In step (S2), the second mold 120 can be placed on the first mold 110 such that one surface of the second mold having the second receiving space S2 faces the first receiving space S1. Therefore, the at least one unit cell 10 can be accommodated in the receiving space S formed by the first receiving space S1 and the second receiving space S2.

[0096] Furthermore, in step (S3), the first molding material 210 injected through the at least one injection hole 113 can be a liquid, uncured resin. The first molding material 210 can be a thermosetting resin; more specifically, the first molding material 210 can be an epoxy molding compound (EMC) composed of epoxy resin, phenolic resin, fillers (e.g., silica and carbon black), flame retardants, etc. However, the first molding material is not particularly limited, as long as it is a pressure-resistant material that will not deform during isostatic pressing after curing.

[0097] Furthermore, in step (S3), the first molding material 210 can be injected into the receiving space S at a predetermined pressure through the at least one injection hole 113. At this time, the at least one cell 10 disposed on the first mold 100 may temporarily float from the bottom surface of the first mold 100 due to the predetermined pressure. The first molding material 210 can fill the receiving space S via the space created during this floating. Here, it is desirable to form a plurality of injection holes 113 in the first mold 100 so that the at least one cell 10 can float while remaining horizontal.

[0098] Furthermore, in step (S3), when the first mold 100 is injected through the at least one injection hole 113, the air present in the receiving space S can be discharged through the vent hole 123 formed in the second mold 120.

[0099] In step (S4), the first molding material 210 injected in step (S3) can be thermosetting to wrap the outer peripheral surface of the at least one cell 10 and a portion of the tab 11. At this time, the first molding material 210 can even fill the space that may appear around the edge of the cell 10, so that the upper surface, lower surface and side surface of the cell 10 can be flat.

[0100] In addition, since the first molding material 210 is cured to cover a portion of the tab 11, it is possible to prevent moisture from seeping in through the tab 11 and to more stably protect the tab 11.

[0101] After step (S4), an isostatic pressing step can also be performed on the all-solid-state secondary battery formed by the first molding material 210. At this time, since the outer peripheral surface of the cell 10 is wrapped by the cured molding material 200 and each surface is flat, the bending or cracking of the cell can be minimized even during high-pressure isostatic pressing.

[0102] Simultaneously, isostatic pressing can be performed using the warm isostatic pressing (WIP) method. For example, warm isostatic pressing (WIP) can be performed at temperatures ranging from 45°C to 100°C to ensure good interfacial contact between electrodes by molding the solid electrolyte while maintaining the electrode constituent materials within a suitable temperature range for thermal stability of the electrode constituent materials.

[0103] For example, isostatic pressing can be performed at a pressing pressure of 4,000 bar to 7,000 bar, and preferably, isostatic pressing can be performed at a pressing pressure of about 5,000 bar.

[0104] The isostatic pressing performed after step (S4) is not limited to this, and can be performed using either the hot isostatic pressing (HIP) method or the cold isostatic pressing (CIP) method.

[0105] Figure 9 This is a top view showing, as an embodiment of the second-solid-state secondary battery manufacturing method according to the present invention, the state in which the second molding material is placed on the first mold constituting the mold for manufacturing the secondary battery when viewed from above. Figure 10 This is a cross-sectional view showing the state in which the second molding material and the cell are housed, as part of a method for manufacturing an all-solid-state secondary battery according to a second embodiment of the present invention. Additionally, Figure 11 This shows the first molding material through Figure 10The diagram shows a cross-sectional view of the injection hole of a mold for manufacturing secondary batteries, in which the injection cavity is filled into the receiving space.

[0106] Reference Figures 1 to 6 as well as Figures 9 to 11 The all-solid-state secondary battery manufacturing method according to the second embodiment of the present invention, using the secondary battery manufacturing mold 100 according to the present invention, in the same manner as the all-solid-state secondary battery manufacturing method according to the first embodiment of the present invention, includes: (S1) a step of accommodating at least one cell 10 in a first accommodating space S1; (S2) a step of placing a second mold 120 on a first mold 110; (S3) a step of injecting a liquid first molding material 210 through an injection hole 113; (S4) a step of thermosetting the first molding material 210; and a step of isostatically pressing the all-solid-state secondary battery formed from the first molding material 210 after step (S4).

[0107] However, unlike the first embodiment, the second embodiment further includes a step of placing the second molding material 220 in the first receiving space S1 before step (S1). In this case, the second molding material 220 may be arranged in the form of multiple particles. These particles are dispersed in the first receiving space S1 to provide a pathway for the first molding material 210 to move and to facilitate the horizontal placement of the at least one cell 10 disposed on the second molding material 220.

[0108] The second molding material 220 can be the same thermosetting resin as the first molding material 210, thereby preventing delamination. For example, if the first molding material 210 is EMC, then the second molding material 220 can also be EMC.

[0109] Furthermore, it is desirable that the second molding material 220 is the same material as the first molding material 210 while having a semi-cured state, thereby preventing layer separation. Here, a semi-cured state refers to, for example, a thermosetting resin that has partially cured but not completely cured as the chemical reaction proceeds.

[0110] Furthermore, each particle of the second molding material 220 may be spherical, and each particle of the second molding material may have a thickness corresponding to the difference between the recess depth of the first receiving space S1 and the height of the tab 11 of the at least one cell 10. In other words, the second molding material 220 may be provided in the form of multiple particles such that when the second molding material is placed in the first receiving space S1 and the at least one cell 10 is disposed on the second molding material, the second molding material 220 has a thickness that allows the tab 11 to be disposed on the first step 112.

[0111] In particular, when each particle of the second molding material 220 is spherical, the first molding material 210 in liquid or slurry state can move more smoothly.

[0112] Figure 12 This is a top view showing, as an embodiment of the third embodiment of the all-solid-state secondary battery manufacturing method according to the present invention, the state in which the second molding material is placed on the first mold constituting the mold for manufacturing the secondary battery when viewed from above. Figure 13 This is a cross-sectional view showing the state in which the second molding material and the cell are housed, as part of a method for manufacturing an all-solid-state secondary battery according to a third embodiment of the present invention. Additionally, Figure 14 This shows the first molding material through Figure 13 The diagram shows a cross-sectional view of the injection hole of a mold for manufacturing secondary batteries, in which the injection cavity is filled into the receiving space.

[0113] Reference Figures 1 to 6 as well as Figures 12 to 14 The second molding material 220 may include multiple particles and a grid frame with multiple intersections.

[0114] In this configuration, the second molding material 220 can be pre-formed, with the particles positioned at the plurality of intersections of the grid frame. Because the plurality of particles are positioned at different locations, the process of placing the second molding material 220 can be performed simply.

[0115] Other constructions and references Figures 1 to 6 as well as Figures 9 to 11 The manufacturing method of the all-solid-state secondary battery according to the second embodiment is the same, so a repeated description thereof will be omitted.

[0116] Meanwhile, in the all-solid-state secondary battery manufacturing method according to each of the first to third embodiments described above, in step (S1), a plurality of stacked unit cells 10 can be accommodated in a first accommodating space S1.

[0117] When multiple stacked cell units 10 are encapsulated in one go using molding material 200 and subjected to isostatic pressing, the decapsulation and main encapsulation steps of traditional all-solid-state secondary battery manufacturing methods can be omitted.

[0118] Figure 15 This is a perspective view showing a portion of the sealing material configured to enclose a tab portion placed on the 1b step portion of a secondary battery manufacturing mold according to the present invention.

[0119] In the all-solid-state secondary battery manufacturing method according to each of the first to third embodiments described above, a sealing material 300 may be disposed on a portion of the tab 11 of each of the at least one cell 10 or a plurality of stacked cell 10 before step (S1) to cover that portion of the tab 11.

[0120] The sealing material 300 can be disposed on a portion of the tab 11 sandwiched between the 1b step portion 112b and the 2b step portion 122b, such that the portion of the tab 11 covered by the sealing material 300 is not exposed to the injected first molding material 210.

[0121] In this case, the sealing material 300 can be an elastic material, preferably silicone. Furthermore, the size of the sealing material 300 can be pre-sized larger than the size of the space between step 1b 112b and step 2b 122b.

[0122] When the material and size of the sealing material 300 are set as described above, the sealing material 300 is compressed according to the gap between the 1b step portion 112b and the 2b step portion 122b, thereby ensuring close contact between the sealing material and the 1b step portion 112b and the 2b step portion 122b. Therefore, it is possible to prevent the injected first molding material 210 from flowing into the space between the 1b step portion 112b and the 2b step portion 122b.

[0123] For example, the sealing material 300 may have a through hole 310 formed in its center to cover a portion of the tab 11. In this case, the sealing material 300 can be removed from the tab 11 after step (S4) and then reused during the molding process of other cell cells to be manufactured.

[0124] Although the specific details of the invention have been described in detail, those skilled in the art will understand that the detailed description only discloses preferred embodiments of the invention and therefore does not limit the scope of the invention. Therefore, those skilled in the art will understand that various changes and modifications can be made without departing from the scope and concept of the invention, and it will be apparent that such changes and modifications fall within the scope of the appended claims.

[0125] (Explanation of reference numerals in the attached image)

[0126] 10: Cell Unit

[0127] 11: Extreme Ear

[0128] 100: Mold

[0129] 110: First mold

[0130] 111: First sidewall portion

[0131] 111a: 1a sidewall member; 111b: 1b sidewall member

[0132] 112: First step

[0133] 113: Injection Hole

[0134] 120: Second mold

[0135] 121: Second sidewall portion

[0136] 121a: 2a sidewall member; 121b: 2b sidewall member

[0137] 122: Second Step

[0138] 123: Exhaust port

[0139] 200: Molding material

[0140] 210: First molding material

[0141] 220: Second molding material

[0142] 300: Sealing material; 310: Through hole

[0143] S: Accommodation space

[0144] S1: First Accommodation Space

[0145] S2: Second Accommodation Space

Claims

1. A mold for manufacturing secondary batteries, the mold comprising: A first mold, the first mold including a first sidewall portion, a first step portion and at least one injection hole, the first sidewall portion being configured to form a first receiving space recessed inward around the central portion of the first mold, the first step portion being formed to be recessed inward from a surface of a sidewall member 1a disposed on each of the two sides in the overall length direction of the first sidewall portion to a predetermined depth. as well as The second mold includes a second sidewall portion, a second step portion, and at least one vent hole. The second sidewall portion is configured to form a second receiving space that is recessed inward around the central portion of the second mold. The second step portion is formed to be recessed inward to a predetermined depth from a surface of a 2a sidewall member disposed on each of the two sides of the second sidewall portion in the overall length direction.

2. The mold according to claim 1, wherein, The first stepped portion extends from the first receiving space and has a recess depth that is less than the recess depth of the first receiving space.

3. The mold according to claim 2, wherein, The length of the first step portion in the overall width direction is less than the length of the first accommodating space in the overall width direction.

4. The mold according to claim 3, wherein, The second step extends from the second receiving space and has a recess depth that is less than the recess depth of the second receiving space.

5. The mold according to claim 4, wherein, The length of the second step portion in the overall width direction is less than the length of the second accommodating space in the overall width direction.

6. The mold according to claim 2, wherein, The injection holes are configured as multiple injection holes, and The exhaust port is configured as a plurality of exhaust ports.

7. A method for manufacturing an all-solid-state secondary battery using a mold according to any one of claims 1 to 6, the method comprising: (S1) At least one cell is accommodated in the first accommodating space; (S2) Place the second mold on the first mold; (S3) Inject liquid first molding material through the injection hole; as well as (S4) The first molding material is thermosetting.

8. The method for manufacturing an all-solid-state secondary battery according to claim 7, wherein, In step (S3), the first molding material is injected into the receiving space through the plurality of injection holes at a predetermined pressure.

9. The method for manufacturing an all-solid-state secondary battery according to claim 7, further comprising: Before step (S1), the second molding material in a semi-cured state is placed in the first receiving space.

10. The method for manufacturing an all-solid-state secondary battery according to claim 9, wherein, The second molding material is a semi-cured particle.

11. The method for manufacturing an all-solid-state secondary battery according to claim 10, wherein, The particles are spherical.

12. The method for manufacturing an all-solid-state secondary battery according to claim 11, wherein, The second molding material includes a grid frame with multiple intersections, and The particles are positioned at each of the plurality of intersections.

13. The method for manufacturing an all-solid-state secondary battery according to claim 12, wherein, Each of the first molding material and the second molding material is a thermosetting resin.

14. The method for manufacturing an all-solid-state secondary battery according to claim 8, wherein, In step (S1), multiple stacked cell units are accommodated.

15. The method for manufacturing an all-solid-state secondary battery according to claim 8, wherein the method further comprises: After step (S4), the all-solid-state secondary battery formed from the first molding material is subjected to isostatic pressing.

Images