Method for manufacturing secondary battery

Abstract

According to exemplary embodiments, provided is a method for manufacturing a secondary battery. The method comprises the steps of: preparing a pack housing and a gasket, wherein the pack housing includes a base plate and sidewalls perpendicular to the base plate, and the gasket includes a non-magnetized component and a sealing component coupled to the non-magnetized component; and assembling a gasket assembly to the pack housing using magnetic force.

Description

Method of manufacturing a secondary battery

[0001] The present invention relates to a method for manufacturing a secondary battery. This application claims the benefit of Korean Application No. 10-2024-0100454, filed July 29, 2024, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] Cell manufacturers are incurring massive capital expenditures to meet the rapidly growing demand for batteries. Improving the throughput of secondary battery manufacturing processes is crucial for the entire secondary battery industry, as it not only meets high consumer demand but also reduces capital expenditures per unit of capacity (e.g., GWh).

[0004] The technical idea of ​​the present invention aims to solve a problem by providing a method for manufacturing a secondary battery with improved productivity.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a method for manufacturing a secondary battery is provided. The method comprises the steps of preparing a pack housing including a base plate and side walls perpendicular to the base plate, and a gasket including a non-magnetic component and a sealing component coupled to the non-magnetic component; and the step of assembling the gasket assembly to the pack housing using magnetic force.

[0006] The above non-magnetic component comprises one of iron, nickel, cobalt, steel, iron alloy, soft iron, silicon steel, ferrite, mu metal, nickel-iron alloy, amorphous metal and ultra-pure aluminum.

[0007] The above sealing part includes one of silicone rubber, EPDM rubber (Ethylene Propylene Diene Monomer Rubber), nitrile rubber, fluorosilicone rubber, fluoroelastomer, natural rubber, Teflon, polyurethane, neoprene rubber, and polycarbonate.

[0008] The above non-magnetic component is embedded in the above sealing component.

[0009] The above sealing part is inserted into the tongue of the above non-magnetic part.

[0010] The above sealing part and the above non-magnetic part are joined by a force fit.

[0011] The method further comprises a step of removing residual magnetism of the gasket.

[0012] The residual magnetism of the above gasket is removed by coercive force.

[0013] The residual magnetism of the above gasket is removed by an alternating magnetic field.

[0014] The residual magnetism of the above gasket is removed by a high-frequency pulse magnetic field.

[0015] According to exemplary embodiments, a battery pack is provided. The battery pack comprises: a pack housing including a base plate and side walls perpendicular to the base plate; a plurality of battery cell assemblies on the base plate; and a gasket on the side walls, wherein the gasket includes a non-magnetic component and a sealing component coupled to the non-magnetic component.

[0016] The above non-magnetic component comprises one of iron, nickel, cobalt, steel, iron alloy, soft iron, silicon steel, ferrite, mu metal, nickel-iron alloy, amorphous metal and ultra-pure aluminum.

[0017] The above sealing part includes one of silicone rubber, EPDM rubber (Ethylene Propylene Diene Monomer Rubber), nitrile rubber, fluorosilicone rubber, fluoroelastomer, natural rubber, Teflon, polyurethane, neoprene rubber, and polycarbonate.

[0018] According to exemplary embodiments of the present invention, gaskets can be assembled into a pack housing using a magnetic assembly robot. This allows for automation of the pack housing assembly process, thereby improving throughput in secondary battery manufacturing.

[0019] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0020] FIG. 1 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments.

[0021] FIG. 2 is a drawing for explaining a method of manufacturing a secondary battery according to exemplary embodiments.

[0022] Figure 3 illustrates a gasket according to exemplary embodiments.

[0023] Fig. 4 is a cross-sectional view of the gasket of Fig. 3.

[0024] Figure 5 illustrates a gasket according to other exemplary embodiments.

[0025] Fig. 6 is a cross-sectional view of the gasket of Fig. 5.

[0026] FIG. 7 is a plan view illustrating a battery pack according to exemplary embodiments.

[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0028] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0029] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0030] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0031]

[0032] (Example 1)

[0033] FIG. 1 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments.

[0034] FIG. 2 is a drawing for explaining a method of manufacturing a secondary battery according to exemplary embodiments.

[0035] Figure 3 illustrates a gasket according to exemplary embodiments.

[0036] Fig. 4 is a cross-sectional view of the gasket of Fig. 3.

[0037] Referring to FIGS. 1 to 4, a pack housing (110) and a gasket (130) can be prepared at P110.

[0038] The pack housing (110) may include a base plate (111), side walls (112, 113, 114, 115), and a center beam (117). Each of the base plate (111) and the side walls (112, 113) may be provided by an extrusion process. The extrusion direction of each of the base plate (111) and the side walls (112, 113) may be the X direction. The side walls (114, 115) may be provided by an extrusion process. The side walls (112, 113, 114, 115) may be substantially perpendicular to the base plate (111).

[0039] The side walls (112, 113, 114, 115) may be at the edges of the base plate (111). The side walls (112, 113) may be joined to edge portions parallel to the X direction of the base plate (111). The side walls (114, 115) may be joined to edge portions parallel to the Y direction of the base plate (111).

[0040] Each of the side walls (112, 113) may be substantially perpendicular to the Y direction. Each of the side walls (112, 113) may extend in the X direction. Each of the side walls (114, 115) may be substantially perpendicular to the X direction. Each of the side walls (114, 115) may extend in the Y direction.

[0041] According to exemplary embodiments, the base plate (111) and side walls (112, 113) may be joined by friction stir welding. The base plate (111) may include a plurality of unit plates joined by friction stir welding. The side walls (114, 115) may be joined to the base plate (111) by spot welding.

[0042] The base plate (111) may include a plurality of cooling channels. The plurality of cooling channels may provide passages for the movement of a coolant, such as water, for example. The plurality of cooling channels may be formed by an extrusion process. The plurality of cooling channels may extend in the X direction. The plurality of cooling channels may be spaced apart from each other in the Y direction.

[0043] A gasket (130) may be placed on the upper surfaces (112U, 113U, 114U, 115U) of the side walls (112, 113, 114, 115). A stud bolt (116) may be placed on the upper surfaces (112U, 113U) of the side walls (112, 113). The stud bolt (116) is used to secure the pack housing (110) and the lid, and may also guide the alignment of the gasket (130) and the pack housing (110).

[0044] According to exemplary embodiments, the gasket (130) may include a non-magnetic component (131) and a sealing component (133). The non-magnetic component (131) may include a different material from the sealing component (133). According to exemplary embodiments, the gasket (130) may be provided through insert molding of the non-magnetic component (131). Accordingly, the non-magnetic component (131) may be embedded in the sealing component (133). The non-magnetic component (131) may be covered by the sealing component (133) and not exposed to the outside, except for mechanical tooling.

[0045] According to exemplary embodiments, the non-magnetic component (131) may include a material capable of magnetic alignment in response to an external magnetic field. According to exemplary embodiments, the non-magnetic component (131) may include one of iron, nickel, cobalt, steel, an iron alloy, soft iron, silicon steel, ferrite, mu metal, a nickel-iron alloy, an amorphous metal, and ultra-pure aluminum.

[0046] The sealing component (133) may surround the non-magnetic component (131). The sealing component (133) may include a flexible material. The sealing component (133) may include one of silicone rubber, EPDM rubber (Ethylene Propylene Diene Monomer Rubber), nitrile rubber, fluorosilicone rubber, fluoroelastomer, natural rubber, Teflon, polyurethane, neoprene rubber, and polycarbonate. Due to the flexibility of the sealing component (133), when the gasket (130) is pressurized by the pack housing (110) and the lid, a liquid-tight seal may be provided in the internal space defined by the pack housing (110) and the lid.

[0047] Next, at P120, the pack housing (110) and the gasket (130) can be assembled using magnetic force. The gasket (130) can be assembled to the pack housing (110) by an assembly robot (AR). The assembly robot (AR) can include a base (RB), a robot arm (RA), and a gripper (RG). As a non-limiting example, the assembly robot (AR) can be a multi-joint robot.

[0048] The base (RB) can support other components of the assembly robot (AR). Accordingly, it can provide stability to the assembly robot (AR) while the other components of the assembly robot (AR) are operating.

[0049] A robot arm (RA) may include multiple actuators, multiple links, multiple joints, and multiple servo motors. The multiple joints are components that allow the robot arm (RA) to bend. The multiple joints may be connected by links. The actuators may include motors and / or hydraulic actuators that control the movement of the robot arm (RA). The servo motors can precisely control the movement of the joints.

[0050] A gripper (RG) may be connected to the end of the robot arm (RA). The gripper (RG) may also be referred to as an end effector. The gripper (RG) may include an electromagnet. The gripper (RG) may be configured to apply a magnetic field to the gasket (130). By applying a magnetic field to the gasket (130), the gripper (RG) can grip the gasket (130) and then place the gasket (130) on the upper surfaces (112U, 113U, 114U, 115U) of the side walls (112, 113, 114, 115).

[0051] Conventional gaskets, which require manual labor due to their elasticity, hinder the establishment of an automated process for assembling the gasket and the pack housing. According to exemplary embodiments, a gasket (130) is provided that includes a non-magnetic component (131) that can be lifted by an electromagnet. Accordingly, the gasket (130) can be assembled by an assembly robot (AR) including an electromagnet, and the assembly process for the gasket (130) and the pack housing (110) can be automated.

[0052]

[0053] Next, in P120, the residual magnetism of the gasket (130) can be removed. According to exemplary embodiments, the gripper (RG) may be configured to apply a coercive force to the non-magnetic part (131) of the gasket (130). According to exemplary embodiments, the gripper (RG) may be configured to apply an alternating magnetic field to the non-magnetic part (131) for demagnetization of the non-magnetic part (131) of the gasket (130). According to exemplary embodiments, the gripper (RG) may be configured to apply a high-frequency pulse magnetic field to the non-magnetic part (131) of the gasket (130).

[0054] According to exemplary embodiments, by demagnetizing the gasket (130), it is possible to prevent corrosion of the pack housing (110), interference with electronic components, and malfunction of the BMS (Battery Management System) due to residual magnetism of the gasket (130).

[0055]

[0056] (Example 2)

[0057] Figure 5 illustrates a gasket according to other exemplary embodiments.

[0058] Fig. 6 is a cross-sectional view of the gasket of Fig. 5.

[0059] Referring to FIGS. 5 and 6 , the gasket (130') may include a non-magnetic component (131') and a sealing component (133'). The non-magnetic component (131') may include one of the materials listed in relation to the non-magnetic component (131) of FIG. 4 . The sealing component (133') may include one of the materials listed in relation to the sealing component (133) of FIG. 4 .

[0060] The non-magnetic component (131') can be partially inserted into the sealing component (133'). The non-magnetic component (131') can include a tongue (131T) that is inserted into a groove (133G) of the sealing component (133'). Accordingly, the non-magnetic component (131') and the sealing component (133') can be coupled to each other in a tongue-and-groove-based interference fit manner.

[0061] The non-magnetic component (131') may be exposed to the outside. The circumference of the non-magnetic component (131') may be larger than the circumference of the sealing component (133'). Accordingly, when the gasket (130') is assembled to the pack housing (110, see FIG. 2), the non-magnetic component (131') may face the outside of the pack housing (110, see FIG. 2).

[0062]

[0063] (Example 3)

[0064] FIG. 7 is a plan view illustrating a battery pack (100) according to exemplary embodiments.

[0065] Referring to FIG. 7, a battery pack (100) may include a pack housing (110), battery cell assemblies (120), and a gasket (130).

[0066] The pack housing (110) and gasket (130) are substantially the same as those described with reference to FIGS. 1 to 4, so redundant descriptions thereof are omitted.

[0067] A plurality of battery cell assemblies (120) may be arranged on a base plate (111) of a pack housing (110). The base plate (111) may support the plurality of battery cell assemblies (120). Side walls (112, 113, 114, 115) may horizontally surround the plurality of battery cell assemblies (120).

[0068] A center beam (117) may be further arranged on the pack housing. The center beam (117) may extend in the X direction. The center beam (117) may be interposed between the side walls (112, 113). The center beam (117) may be included in a center plate, which is one of a plurality of unit plates that are friction stir welded to each other. Accordingly, the center beam (117) may be formed together with the center plate, and the center beam (117) may be a continuous element integrally formed with the center plate.

[0069] Each of the plurality of battery cell assemblies (120) may include a plurality of battery cells arranged in the X direction, a plurality of pads, a first integrated circuit assembly, and a second integrated circuit assembly.

[0070] Each of the plurality of battery cells may be a lithium ion battery. Each of the plurality of battery cells includes an electrode assembly, an electrolyte, and a cell case. The cell case may include an aluminum laminate sheet, a cylindrical metal can, a square metal can, or a combination thereof.

[0071] An electrode assembly built into a cell case includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The electrode assembly may be one of a jelly-roll type and a stack type. A jelly-roll type electrode assembly may include a winding structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly may include a plurality of sequentially stacked positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed therebetween. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and a negative electrode active material.

[0072] Each of the plurality of battery cells may include a positive lead and a negative lead. The positive lead and the negative lead may be collectively referred to as electrode leads. That is, the electrode lead may refer to either the positive lead or the negative lead. The positive lead may be coupled to the negative tab of the electrode assembly. The negative lead may be coupled to the negative tab of the electrode assembly.

[0073] A plurality of battery cells may be arranged in the X direction. Each of the plurality of battery cells may be a bidirectional cell. Accordingly, the positive and negative leads of each of the plurality of battery cells may protrude in opposite directions from the cell case. The positive and negative leads of each of the plurality of battery cells may be spaced apart from each other in the Y direction. The Y direction may be substantially perpendicular to the X direction. A direction substantially perpendicular to each of the X direction and the Y direction is defined as the Z direction.

[0074] Below, the technical concept of the present invention will be explained with reference to an example in which each of the plurality of battery cells is a bidirectional cell, as described above. Those skilled in the art will readily be able to arrive at an embodiment in which each of the plurality of battery cells is a unidirectional cell based on the description herein.

[0075] According to exemplary embodiments, a plurality of battery cells may form a plurality of banks. Each of the plurality of banks is a subgroup of a plurality of battery cells, each of which is comprised of battery cells connected in parallel. The number of battery cells included in each of the plurality of banks (i.e., the number of battery cells connected in parallel) may be determined based on the magnitude of the current to be output through the battery cell assemblies (120).

[0076] Hereinafter, the technical concept of the present invention will be described with reference to an example in which each of the plurality of banks includes only one of the plurality of battery cells (i.e., an example in which each of the plurality of battery cells is a bank). Those skilled in the art will readily be able to arrive at an example in which each of the plurality of battery cells includes one or more banks based on the description herein.

[0077] According to exemplary embodiments, each of the plurality of pads may include polyurethane. According to exemplary embodiments, each of the plurality of pads may include an elastic material. The plurality of pads may absorb swelling of the plurality of battery cells. Two battery cells may be interposed between two adjacent pads, but the present invention is not limited thereto. The thickness of each of the plurality of pads and the arrangement of the plurality of pads based on the plurality of battery cells may be varied within a range that satisfies the swelling absorption condition.

[0078] According to other exemplary embodiments, the plurality of pads may be thermal barriers. According to exemplary embodiments, each of the plurality of pads may have a high melting temperature and low thermal conductivity. If each of the plurality of pads is a thermal barrier, each of the plurality of pads may include a flame-retardant material, such as ceramic and coated glass fiber.

[0079] A first integrated circuit assembly may be located in front of each of the battery cell assemblies (120). The first integrated circuit assembly may be coupled to a plurality of battery cells. The first integrated circuit assembly may include a first insulating frame, a first integrated circuit, bus bars, and an insulating cover.

[0080] The first insulating frame may include an insulating material. The first insulating frame may support the first integrated circuit and bus bars.

[0081] The first integrated circuit may be mounted on the first insulating frame. The first integrated circuit may be configured to be electrically connected to the positive lead of each of the odd-numbered battery cells and the negative lead of each of the even-numbered battery cells. The first integrated circuit may be configured to detect voltages of a plurality of nodes comprising a plurality of battery cells.

[0082] The insulating cover may be mounted on the first insulating frame. The insulating cover may be fitted to the first insulating frame. The insulating cover may cover the first integrated circuit. The insulating cover may include an insulating material.

[0083] The second integrated circuit assembly may be located at the rear of each of the battery cell assemblies (120). The front of each of the battery cell assemblies (120) may be opposite the rear of each of the battery cell assemblies (120). The second integrated circuit assembly may be spaced apart from the first integrated circuit assembly with a plurality of battery cells therebetween. The second integrated circuit assembly may be coupled to the plurality of battery cells. The second side may have a negative lead for each of the odd-numbered battery cells and a positive lead for each of the even-numbered battery cells.

[0084] The distance between the negative lead of each of the odd-numbered battery cells and the second integrated circuit assembly may be smaller than the distance between the negative lead of each of the odd-numbered battery cells and the first integrated circuit assembly.

[0085] The distance between the positive lead of each of the even-numbered battery cells and the second integrated circuit assembly may be smaller than the distance between the positive lead of each of the even-numbered battery cells and the first integrated circuit assembly.

[0086] The second integrated circuit assembly may include a second insulating frame, a second integrated circuit, and an insulating cover. The second insulating frame may include an insulating material. The second insulating frame may support the second integrated circuit and the insulating cover.

[0087] A second integrated circuit may be mounted on the second insulating frame. The second integrated circuit may be configured to be electrically connected to the negative leads of each of the odd-numbered battery cells and the positive leads of each of the even-numbered battery cells. The second integrated circuit may be configured to detect voltages of a plurality of nodes comprising a plurality of battery cells.

[0088] The second insulating cover may be mounted on the second insulating frame. The second insulating cover may be fittedly connected to the second insulating frame. The second insulating cover may include an insulating material. The second insulating cover may cover and protect the negative leads of each of the odd-numbered battery cells and the positive leads of each of the even-numbered battery cells.

[0089] Each of the battery cell assemblies (120) may further include an FFC (Flat Flexible Cable) assembly. The FFC assembly may connect the first integrated circuit and the second integrated circuit to each other. Voltage values ​​collected by the second integrated circuit may be transmitted to the first integrated circuit via the FFC assembly.

[0090]

[0091] The arrangement of the plurality of battery cell assemblies (120) in FIG. 7 can be referred to as a 2*2 arrangement. The arrangement of the plurality of battery cell assemblies (120) disclosed in FIG. 7 is a non-limiting example and does not limit the technical idea of ​​the present invention in any sense. A person skilled in the art will be able to easily arrive at a plurality of battery cell assemblies (120) arranged in P*Q (wherein, P and Q are each integers greater than or equal to 1) based on the description herein.

[0092] The battery pack (100) may further include a BMS. The BMS may be configured to perform monitoring, balancing, and control of the battery pack (100). Monitoring of the battery pack (100) may include measuring voltage and current of specific nodes within a plurality of battery cell assemblies (120) and measuring temperatures of set locations within the battery pack (100).

[0093] Balancing of a battery pack (100) is an operation that reduces the deviation between multiple battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharge, overdischarge, and overcurrent. Through monitoring, balancing, and control, the battery pack (100) can operate under optimal conditions, thereby preventing shortening of the lifespan of each of the multiple battery cell assemblies (120).

[0094] The battery pack (100) may further include leads coupled to side walls (112, 113, 114, 115) of the pack housing (110). The leads may cover elements mounted inside the battery pack (100), such as a plurality of battery cell assemblies (120) and electrical components. The leads may be secured to the pack housing (110) by mechanical coupling means, such as bolting.

[0095] The battery pack may further include exhaust devices coupled to the side walls (114, 115). One of the side walls (114, 115) may include exhaust holes connected to the exhaust devices. The exhaust devices may be configured to delay thermal propagation by releasing high-temperature gas within the battery pack (100) to the outside when a thermal runway event occurs in a plurality of battery cell assemblies (120).

[0096] Here, thermal runaway of multiple battery cell assemblies (120) is a state in which temperature changes of multiple battery cell assemblies (120) further accelerate the temperature change, which is an uncontrollable positive feedback. Multiple battery cell assemblies (120) in a state of thermal runaway exhibit a rapid temperature increase and emit a large amount of high-pressure gas and combustion debris.

[0097] The battery pack (100) may further include additional electrical components, such as a cooling device, a PRA (Power Relay Assembly), and a safety plug. The cooling device may include a cooling fan. The cooling fan may prevent overheating of each of the plurality of battery cell assemblies (120) by circulating air inside the battery pack (100). The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA may protect the plurality of battery cell assemblies (120) and the external load (e.g., a vehicle motor) by cutting off power supply to the external load (e.g., a vehicle motor) in a situation where an abnormal voltage, such as a voltage surge, occurs. Additional electrical components may be interposed between the plurality of battery cell assemblies (120) and the sidewall (115). The space between the battery cell assemblies (120) and the sidewall (115) may also be referred to as an electrical component mounting area.

[0098] The battery pack (100) may further include a plurality of inter-busbars configured to electrically connect a plurality of battery cell assemblies (120). The plurality of battery cell assemblies (120) may be connected in series by the plurality of inter-busbars. Accordingly, the battery pack (100) may be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0099]

[0100] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A step of preparing a pack housing including a base plate and side walls perpendicular to the base plate and a gasket including a non-magnetic part and a sealing part coupled to the non-magnetic part; and A method for manufacturing a secondary battery, comprising the step of assembling a gasket assembly into the pack housing using magnetic force.

2. In paragraph 1, A method for manufacturing a secondary battery, wherein the non-magnetic component comprises one of iron, nickel, cobalt, steel, iron alloy, soft iron, silicon steel, ferrite, mu metal, nickel-iron alloy, amorphous metal, and ultra-pure aluminum.

3. In paragraph 1, A method for manufacturing a secondary battery, wherein the sealing part comprises one of silicone rubber, EPDM rubber (Ethylene Propylene Diene Monomer Rubber), nitrile rubber, fluorosilicone rubber, fluororubber, natural rubber, Teflon, polyurethane, neoprene rubber, and polycarbonate.

4. In paragraph 1, A method for manufacturing a secondary battery, characterized in that the gasket is prepared by insert molding of the non-magnetic component.

5. In paragraph 1, A method for manufacturing a secondary battery, characterized in that the non-magnetic component is embedded in the sealing component.

6. In paragraph 1, A method for manufacturing a secondary battery, wherein the sealing part includes a groove into which the tongue of the non-magnetic part is inserted.

7. In paragraph 6, A method for manufacturing a secondary battery, characterized in that the sealing component and the non-magnetic component are joined by a force fit.

8. In paragraph 1, A method for manufacturing a secondary battery, characterized in that it further comprises a step of removing residual magnetism of the gasket.

9. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the residual magnetism of the above gasket is removed by coercive force.

10. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the residual magnetism of the above gasket is removed by an alternating magnetic field.

11. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the residual magnetism of the above gasket is removed by a high-frequency pulse magnetic field.

12. A pack housing comprising a base plate and side walls perpendicular to the base plate; a plurality of battery cell assemblies on the base plate; and Including gaskets on the above side walls, A battery pack characterized in that the gasket comprises a non-magnetic component and a sealing component coupled to the non-magnetic component.

13. In paragraph 12, A battery pack characterized in that the non-magnetic component comprises one of iron, nickel, cobalt, steel, iron alloy, soft iron, silicon steel, ferrite, mu metal, nickel-iron alloy, amorphous metal and ultra-pure aluminum.

14. In paragraph 12, A battery pack characterized in that the sealing part comprises one of silicone rubber, EPDM rubber (Ethylene Propylene Diene Monomer Rubber), nitrile rubber, fluorosilicone rubber, fluororubber, natural rubber, Teflon, polyurethane, neoprene rubber, and polycarbonate.

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