Secondary battery manufacturing apparatus and manufacturing method

Abstract

The secondary battery manufacturing apparatus of the present invention includes a pair of sealing blocks that are arranged on each side of the sealed portion of a pouch from which the electrode leads are pulled out, and that crimp and seal the sealed portion at a predetermined sealing temperature and a predetermined pressure, and a preheating member that preheats the sealed portion of the pouch and the pair of sealing blocks to a preheating temperature, and the preheating member includes a first heating element that preheats the surface of the sealed portion where the pair of sealing blocks are located to the preheating temperature, and a second heating element that preheats the surfaces of the pair of sealing blocks facing the sealed portion to the preheating temperature.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0183211, filed December 20, 2021, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to an apparatus and method for manufacturing a secondary battery that can improve the sealing force of the sealed portion of a pouch from which an electrode lead is drawn. [Background technology]

[0003] Generally, secondary batteries are batteries that can be charged and discharged, unlike primary batteries that cannot be charged, and are widely used in electronic devices such as mobile phones, laptop computers, and camcorders, as well as electric vehicles.

[0004] The secondary battery includes an electrode assembly having an electrode tab, an electrode lead connected to the electrode tab, a pouch that houses the electrode assembly with the tip of the electrode lead extended to the outside, and a lead film attached to the electrode lead located at a sealing part of the pouch. The pouch also includes a receiving part that houses the electrode assembly and a sealing part formed along an edge surface of the receiving part to seal the receiving part.

[0005] On the other hand, a method for manufacturing a secondary battery includes an accommodation step of accommodating an electrode assembly in an accommodation portion of a pouch, and a sealing step of sealing the sealed portion of the pouch using a pair of seal blocks, and the sealing step can seal the sealed portion of the pouch by increasing the temperature of the pair of seal blocks and applying heat to the sealed portion.

[0006] Here, the sealed portion of the pouch from which the electrode lead is pulled out is sealed by heat fusing the lead film and the sealed portion, but there was a problem in that the sealing strength was reduced due to heat loss through the electrode lead, which is made of metal.

[0007] To solve this problem, a lead heater system has been introduced that supplies a heat source to the electrode lead, thereby minimizing heat loss through the electrode lead and thereby increasing the sealing strength of the seal portion.

[0008] However, although the sealing process using the lead heater system can minimize heat loss through the electrode lead by directly heating the electrode lead, there is a problem of temperature deviation occurring throughout the pouch from which the electrode lead is extracted, which inevitably leads to deviations in the sealing strength of the entire seal portion of the pouch from which the electrode lead is extracted.In particular, there is a limit to how much heat can be supplied to the electrode lead or seal block in a short period of time. Summary of the Invention [Problem to be solved by the invention]

[0009] To address the above-described problems, the present invention provides a preheating member that allows the pouch seal and the seal block to be heated to a preheat temperature lower than the sealing temperature before sealing the pouch seal. This allows the electrode leads to be heated to the preheat temperature along with the pouch seal, minimizing heat loss through the electrode leads and thereby increasing the sealing strength of the pouch seal from which the electrode leads are extracted. In particular, the seal of the pouch from which the electrode leads are extracted can be uniformly heated, preventing the seal block from losing temperature during continuous production. That is, when secondary batteries are continuously sealed through the seal block, the heat source gradually decreases, which can result in differences in seal strength between secondary batteries produced in the early stages of the sealing process and those produced in the middle and later stages of the sealing process. To address this issue, the present invention provides an apparatus and method for manufacturing a secondary battery that preheats the seal block to prevent the heat source of the seal block from decreasing, thereby achieving uniform seal strength throughout the entire sealing process. [Means for solving the problem]

[0010] To achieve the above-mentioned object, the secondary battery manufacturing apparatus of the present invention includes a pair of sealing blocks that are arranged on each side of the sealed portion of a pouch from which electrode leads are pulled out, and that press and seal the sealed portion at a predetermined sealing temperature and a predetermined pressure, and a preheating member that preheats the sealed portion of the pouch and the pair of sealing blocks to a preheating temperature, and the preheating member includes a first heating element that preheats the surface of the sealed portion where the pair of sealing blocks are located to the preheating temperature, and a second heating element that preheats the surface of the pair of sealing blocks facing the sealed portion to the preheating temperature.

[0011] The preheat temperature of the seal portion preheated by the first heater and the preheat temperature of the pair of seal blocks preheated by the second heater may be the same temperature or different temperatures.

[0012] When the preheating temperature of the seal portion preheated by the first heater and the preheating temperature of the pair of seal blocks preheated by the second heater are different from each other, the preheating temperature of the seal portion preheated by the first heater may be lower than the preheating temperature of the pair of seal blocks preheated by the second heater.

[0013] The preheating temperature can be set to 100°C to 230°C.

[0014] The first heating element and the second heating element may be provided as a heating lamp.

[0015] The preheating member may further include a temperature sensor that detects the temperature of the seal portion of the pouch and the pair of seal blocks, and a control unit that stops the operation of the first heater and the second heater when the temperature detected by the temperature sensor rises to a preheat temperature, thereby stopping the preheating of the seal portion of the pouch and the pair of seal blocks.

[0016] The preheating member may further include a first moving body that advances the first heating element toward the sealing portion or returns it to its initial position, and a second moving body that moves the second heating element toward each of the pair of sealing blocks or returns it to its initial position.

[0017] The preheating temperature may be lower than the sealing temperature.

[0018] Meanwhile, a method for manufacturing a secondary battery according to the present invention includes: a transporting step of transporting a secondary battery, the secondary battery including an electrode assembly and a pouch accommodating the electrode assembly; an arranging step of arranging a pair of seal blocks on both sides of a seal portion formed in the pouch of the secondary battery; a preheating step of preheating the surfaces of the seal portions of the corresponding pouches and the pair of seal blocks to a preheat temperature using a preheating member; and a sealing step of heating the seal blocks preheated to the preheat temperature to a sealing temperature and then crimping and sealing the seal portions of the pouches preheated to the preheat temperature, wherein the preheating step includes a process of preheating the surfaces of the seal portions where the pair of seal blocks are located to the preheat temperature using a first heater of a preheating member, and a process of preheating the surfaces of the pair of seal blocks facing the seal portions to the preheat temperature using a second heater of the preheating member.

[0019] In the preheating step, the preheating temperature of the seal portion preheated by the first heater and the preheating temperature of the pair of seal blocks preheated by the second heater may be the same temperature or different temperatures.

[0020] In the preheating step, when the preheating temperature of the seal portion preheated by the first heating element and the preheating temperature of the pair of seal blocks preheated by the second heating element are different from each other, the preheating temperature of the seal portion preheated by the first heating element may be lower than the preheating temperature of the pair of seal blocks preheated by the second heating element.

[0021] The preheating temperature can be set to 100°C to 230°C.

[0022] The first heater and the second heater may be a heating lamp.

[0023] The preheating step may further include a step of detecting the temperature of the seal portion of the pouch and the pair of seal blocks via a temperature detection sensor, and a step of stopping the preheating of the seal portion of the pouch and the pair of seal blocks by stopping the operation of the first heater and the second heater via a control unit when the temperature detected by the temperature detection sensor rises to a preheat temperature.

[0024] The transferring step may further include a temporary preheating step of heating a seal portion formed on a pouch of the secondary battery during transfer. [Effects of the Invention]

[0025] The apparatus and method for manufacturing a secondary battery according to the present invention include a preheating member, which allows the pouch seal and the seal block to be heated to a preheat temperature before sealing the pouch seal, thereby minimizing heat loss through the electrode leads and increasing the sealing strength of the pouch seal from which the electrode leads are extracted. In particular, the entire pouch seal from which the electrode leads are extracted can be uniformly heated, thereby suppressing the temperature of the seal block, which would otherwise be lost and weakened during continuous production. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a perspective view illustrating a secondary battery according to a first embodiment of the present invention; [Figure 2] 1 is a front view illustrating an apparatus for manufacturing a secondary battery according to a first embodiment of the present invention. [Figure 3] 3 is a front view illustrating a state in which the seal portion of the pouch is crimped by the seal block of the manufacturing apparatus for a secondary battery according to the first embodiment of the present invention. FIG. [Figure 4] 3 is a flowchart showing a method for manufacturing a secondary battery according to a first embodiment of the present invention. [Figure 5] 3 is a side view illustrating a transfer step in the method for manufacturing a secondary battery according to the first embodiment of the present invention. FIG. [Figure 6] 3A and 3B are side views illustrating a placement step and a preheating step of the method for manufacturing a secondary battery according to the first embodiment of the present invention. [Figure 7] 3 is a side view illustrating a sealing step in the method for manufacturing a secondary battery according to the first embodiment of the present invention. FIG. [Figure 8] FIG. 5 is a front view illustrating an apparatus for manufacturing a secondary battery according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily understand the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in the drawings, parts that are not relevant to the description are omitted in order to clearly explain the present invention, and similar parts are designated by similar reference numerals throughout the specification.

[0028] [Secondary battery according to the first embodiment of the present invention] Referring to FIG. 1, a secondary battery 10 according to a first embodiment of the present invention includes an electrode assembly 11, an electrode lead 13 connected to an electrode tab of the electrode assembly 11, a pouch 12 that accommodates the electrode assembly 11 with the tip of the electrode lead 13 extended to the outside, and a lead film 14 provided on the electrode lead 13 located at a sealed portion of the pouch.

[0029] The electrode assembly 11 has a structure in which a plurality of separators and a plurality of electrodes are alternately arranged. The plurality of electrodes may be positive and negative electrodes. The plurality of electrodes are provided with electrode tabs, to which the electrode leads 13 are connected.

[0030] Meanwhile, the electrode tabs include a positive electrode tab provided on the positive electrode and a negative electrode tab provided on the negative electrode, and the electrode leads include a positive electrode lead connected to the positive electrode tab and a negative electrode lead connected to the negative electrode tab.

[0031] The pouch 12 includes a receiving portion 12a for receiving the electrode assembly 11, and a sealing portion 12b formed along the edge surface of the receiving portion 12a to seal the receiving portion 12a.

[0032] The lead film 14 is intended to increase the sealing force between the electrode lead 13 and the seal portion 12b of the pouch 12. That is, the lead film 14 is provided in a form that wraps around the periphery of the electrode lead 13 located at the seal portion 12b.

[0033] The secondary battery having the above structure can be manufactured by the secondary battery manufacturing apparatus according to the first embodiment of the present invention.

[0034] That is, the secondary battery manufacturing apparatus 100 according to the first embodiment of the present invention accommodates the electrode assembly 11 in the accommodation portion 12a of the pouch 12, and then seals the seal portion 12b of the pouch 12 using a pair of seal blocks 110 to manufacture a secondary battery.

[0035] In particular, the secondary battery manufacturing apparatus 100 according to the first embodiment of the present invention can increase the sealing strength of the seal portion 12b of the pouch 12 from which the electrode lead 13 is pulled out by preheating the seal portion 12b of the pouch 12 and the seal block 110 before sealing the seal portion 12b of the pouch 12, thereby eliminating or minimizing heat loss due to leakage from the electrode lead and increasing the sealing strength.

[0036] Meanwhile, the secondary battery manufacturing apparatus 100 according to the first embodiment of the present invention can also seal the seal portion 12b of the pouch 12 that does not have the electrode lead 13, but in the present invention, the seal portion of the pouch from which the electrode lead 13 is pulled out will be described as one embodiment.

[0037] [Secondary battery manufacturing apparatus according to the first embodiment of the present invention] As shown in FIG. 1, a secondary battery manufacturing apparatus 100 according to a first embodiment of the present invention includes a pair of seal blocks 110 and a preheating member 120.

[0038] [Pair of seal blocks] The pair of seal blocks 110 are used to seal the sealed portion of the pouch that houses the electrode assembly 11. In particular, the pair of seal blocks 110 are used to crimp and seal the sealed portion of the pouch from which the electrode lead 13 is pulled out, using heat and pressure.

[0039] That is, a pair of sealing blocks 110 are arranged to correspond to both sides of the sealed portion 12b of the pouch 12 from which the electrode lead 13 has been pulled out, and the sealed portion 12b is crimped and sealed at a predetermined sealing temperature and a predetermined pressure.

[0040] Here, the sealing temperature refers to the temperature to which the seal block is heated to heat-seal the seal portion 12b. For example, the sealing temperature may be 190°C to 230°C.

[0041] [Preheating material] As shown in FIGS. 2 and 3 , the preheating member 120 preheats the seal portion 12b of the pouch 12 and the pair of seal blocks 110 to a preheating temperature before sealing the seal portion of the pouch 12. That is, by preheating the seal portion 12b of the pouch 12 and the pair of seal blocks 110 to a preheating temperature, the preheating member 120 can suppress the temperature of the seal blocks, which would otherwise be lost and weakened during continuous production. That is, when secondary batteries are continuously sealed through the seal blocks, the heat source weakens, which can result in differences in seal strength between secondary batteries produced in the early stages of the sealing process and those produced in the middle and later stages of the sealing process. To prevent this, the present invention preheats the seal blocks, preventing the heat source of the seal blocks from weakening, thereby achieving uniform seal strength throughout the sealing process. Furthermore, because the electrode leads 13 are preheated along with the seal portion 12b of the pouch 12, heat loss from the electrode leads 13 can be eliminated or minimized.

[0042] As an example, the preheating member 120 includes a first heater 121 that preheats the surface of the sealing portion 12b where the pair of sealing blocks 110 are located to a preheating temperature, and a second heater 122 that preheats the surface of the pair of sealing blocks 110 facing the sealing portion 12b to a preheating temperature.

[0043] As a result, the preheating member 120 heats the seal portion 12b of the pouch 12 and the pair of seal blocks 110 to the preheat temperature, shortening the time required to supply heat energy to the pouch to ensure high seal strength and improving productivity. Furthermore, by preventing the seal block temperature from dropping during continuous production, secondary batteries with uniform seal quality can be produced. In other words, to achieve a strong seal, the seal block, which is the heat source, needs to press the pouch for a long time (e.g., 5 seconds). However, adding preheating minimizes heat loss from the seal portion of the pouch, significantly shortening the time required for the seal block to press the pouch (e.g., 2 seconds). As a result, productivity can be improved by shortening the sealing time and ensuring seal strength. On the other hand, for example, if the sealing time is 5 seconds, 720 secondary batteries (3600S / 5S=720) can be produced per hour, and if the sealing time is 2 seconds, 1800 secondary batteries (3600 / 2S=1800) can be produced per hour. In other words, productivity can be increased by approximately two times.

[0044] In particular, since the electrode lead 13 is preheated together with the sealed portion 12b of the pouch 12, it is possible to prevent or minimize heat loss from the electrode lead 13 when sealing the sealed portion 12b of the pouch 12, thereby improving the quality of the sealed portion 12b of the pouch 12. Furthermore, the preheating member 120 can minimize the temperature deviation throughout the sealed portion 12b of the pouch 12, thereby uniformly sealing the entire sealed portion 12b of the pouch 12 and preventing poor sealing.

[0045] Meanwhile, the preheating temperature of the seal portion 12b preheated by the first heater 121 and the preheating temperature of the pair of seal blocks 110 preheated by the second heater 122 may be the same temperature or different temperatures.

[0046] Here, when the preheating temperature of the seal portion 12b preheated by the first heater 121 and the preheating temperature of the pair of seal blocks 110 preheated by the second heater 122 are the same temperature, the first heater 121 and the second heater 122 can simultaneously heat the seal portion 12b of the pouch 12 and the pair of seal blocks 110 at the same temperature. Also, the first heater 121 and the second heater 122 can use the same heater.

[0047] Meanwhile, when the preheating temperature of the seal portion 12b preheated by the first heater 121 and the preheating temperature of the pair of seal blocks 110 preheated by the second heater 122 are different temperatures, the preheating temperature of the seal portion 12b preheated by the first heater 121 may be lower than the preheating temperature of the pair of seal blocks preheated by the second heater. That is, the heating temperature of the seal portion 12b which is more likely to deform due to heat is set low, and the heating temperature of the seal block 110 for sealing the pouch 12 is set high.

[0048] Meanwhile, the preheat temperature of the sealing portion and the seal block can be set to 100° C. to 230° C., and preferably 150° C. to 200° C. Here, if the preheat temperature of the seal block is 100° C. or less, it takes a long time to raise the seal block from the preheat temperature to the sealing temperature, whereas if the preheat temperature of the seal block is 230° C. or more, it takes less time to raise the seal block from the preheat temperature to the sealing temperature, but it takes a long time to raise the seal block to the preheat temperature, which causes a problem of reduced workability.

[0049] Meanwhile, the first heater 121 and the second heater 122 may be heating lamps, thereby stably heating the entire seal portion 12b of the pouch 12 and the pair of seal blocks 110.

[0050] 3, the pre-heating member 120 may further include a temperature sensor 123 that detects the temperature of the seal portion 12b of the pouch 12 and the pair of seal blocks 110, and a control unit 124 that stops the operation of the first heater 121 and the second heater 122 when the temperature detected by the temperature sensor 123 rises to the pre-heat temperature, thereby stopping the pre-heating of the seal portion 12b of the pouch 12 and the pair of seal blocks 110. As a result, the pre-heating member 120, including the temperature sensor 123 and the control unit 124, can stably pre-heat the seal portion 12b of the pouch 12 and the pair of seal blocks 110 up to the pre-heat temperature.

[0051] Therefore, the secondary battery manufacturing apparatus 100 according to the first embodiment of the present invention includes a preheating member 120, thereby increasing the sealing force of the seal portion 12b of the pouch 12 from which the electrode lead 13 has been pulled out, and preventing poor sealing.

[0052] A manufacturing method using the secondary battery manufacturing apparatus according to the first embodiment of the present invention will be described below.

[0053] [Method of manufacturing a secondary battery according to the first embodiment of the present invention] As shown in FIG. 4, the method for manufacturing a secondary battery according to the first embodiment of the present invention includes a transferring step, a positioning step, a preheating step, and a sealing step.

[0054] FIG. 5 is a side view illustrating a transfer step in the method for manufacturing a secondary battery according to the first embodiment of the present invention.

[0055] [Transport Step] In the transport step, the secondary battery 10 is transported to the placement step by a transport device 20 using a conveyor belt (not shown) or the like. Referring to FIG. 1, the secondary battery 10 includes an electrode assembly 11, an electrode lead 13 connected to the electrode assembly 11, a pouch 12 that houses the electrode assembly 11 with the tip of the electrode lead 13 extended to the outside, and a lead film 14 attached to the electrode lead 13 located in the pouch 12.

[0056] On the other hand, the secondary battery 10 has been described in detail above, so a detailed description thereof will be omitted here.

[0057] FIG. 6 is a side view illustrating the arrangement step and the preheating step of the method for manufacturing a secondary battery according to the first embodiment of the present invention.

[0058] Placement Step In the arranging step, a pair of seal blocks 110 are arranged on both sides of the seal portion 12b formed on the pouch 12 of the secondary battery, preferably on both sides of the seal portion 12b of the pouch 12 from which the electrode leads 13 are drawn out. At this time, the pair of seal blocks 110 are arranged at a predetermined distance from the seal portion 12b of the pouch 12.

[0059] [Preheating step] The preheating step involves preheating the surfaces of the seal portions 12b of the corresponding pouches 12 and the pair of seal blocks 110 to a preheat temperature using a preheating member 120. That is, the preheating step includes a process of preheating the surfaces of the seal portions 12b where the pair of seal blocks 110 are located to a preheat temperature using a first heater 121 of the preheating member 120, and a process of preheating the surfaces of the pair of seal blocks 110 facing the seal portions 12b to a preheat temperature using a second heater 122 of the preheating member 120.

[0060] Meanwhile, in the preheating step, the preheating temperature of the seal portion 12b preheated by the first heater 121 and the preheating temperature of the pair of seal blocks preheated by the second heater 122 may be the same temperature or different temperatures.

[0061] For example, when the preheat temperature of the seal portion 12b preheated by the first heater 121 and the preheat temperature of the pair of seal blocks 110 preheated by the second heater 122 are different from each other, the preheat temperature of the seal portion 12b preheated by the first heater 121 may be lower than the preheat temperature of the pair of seal blocks 110 preheated by the second heater 122. This is because the seal portion 12b is set to a lower preheat temperature than the seal block 110 to prevent deformation of the seal portion 12b, and the seal block 110 is set to a higher preheat temperature than the seal portion 12b to shorten the time it takes to heat up to the sealing temperature.

[0062] The preheating temperature of the sealing portion and the sealing block can be set to 100°C to 230°C, and preferably 150°C to 200°C.

[0063] Heating lamps that emit high-temperature light may be used as the first heater 121 and the second heater 122. This allows the entire seal portion 12b and the seal block 110 to be stably and uniformly heated up to the preheating temperature.

[0064] Meanwhile, the preheating step may further include a step of detecting the temperature of the seal portion 12b of the pouch 12 and the pair of seal blocks 110 via a temperature detecting sensor 123, and a step of stopping the operation of the first heater 121 and the second heater 122 via a control unit 124, when the temperature detected by the temperature detecting sensor 123 rises to the preheating temperature, thereby stopping the preheating of the seal portion 12b of the pouch 12 and the pair of seal blocks 110. As a result, the preheating step can stably preheat the seal portion 12b of the pouch 12 and the pair of seal blocks 110 up to the preheating temperature.

[0065] FIG. 7 is a side view illustrating a sealing step in the method for manufacturing a secondary battery according to the first embodiment of the present invention.

[0066] [Seal Step] In the sealing step, the pair of sealing blocks 110 are heated to a sealing temperature higher than the preheating temperature, and then the pair of sealing blocks 110 is used to crimp and seal the seal portion 12b of the pouch 12, which has been preheated to the preheating temperature. Here, the pair of sealing blocks 110 seal the preheated pouch, thereby significantly reducing the time required to supply the heat source required for sealing. In particular, when the seal portion 12b of the pouch 12 is crimped by the pair of sealing blocks 110, the electrode lead 13 drawn out from the seal portion 12b of the pouch 12 is also heated to the preheating temperature, preventing heat loss. As a result, weakening and failure of the seal force on the seal portion 12b of the pouch 12 can be prevented.

[0067] That is, since the electrode lead 13 is preheated to the preheat temperature, the temperature difference between the electrode lead and the pouch 12 heated and crimped by the pair of sealing blocks 110 can be minimized, thereby eliminating or minimizing heat loss from the electrode lead.

[0068] Once these steps are completed, the finished secondary battery 10 can be manufactured.

[0069] 5, the transporting step may further include a temporary preheating step of preheating the seal portion 12b formed on the pouch 12 of the secondary battery 10 during transport using a temporary heater 120a, and a plurality of temporary heaters 120b are installed along the transport line of the secondary battery 10. This significantly reduces the time required to raise the seal portion 12b of the pouch 12 to the preheating temperature in the preheating step. Here, the temporary preheating step may preheat the seal portion 12b of the pouch 12 to a temperature lower than the temperature at which the seal portion 12b of the pouch 12 is preheated in the preheating step.

[0070] In the following description of other embodiments of the present invention, the same components as those in the above-described embodiment will be designated by the same reference numerals, and redundant description will be omitted.

[0071] [Second embodiment of the secondary battery manufacturing apparatus according to the present invention] As shown in FIG. 8, the secondary battery manufacturing apparatus 100 according to the second embodiment of the present invention includes a pair of sealing blocks 110 that are arranged to correspond to both sides of the sealed portion 12b of the pouch 12 from which the electrode lead 13 has been pulled out, and that seal the sealed portion 12b of the pouch 12 at a predetermined sealing temperature and a predetermined pressure, and a preheating member 120 that preheats the sealed portion 12b of the pouch 12 and the pair of sealing blocks 110 to a preheating temperature that is lower than the sealing temperature before sealing the sealed portion 12b of the pouch 12 via the pair of sealing blocks 110.

[0072] The preheating member 120 includes a first heater 121 that preheats the surface of the sealing portion 12b where the pair of sealing blocks 110 are located to a preheating temperature, and a second heater 122 that preheats the surface of the pair of sealing blocks 110 facing the sealing portion 12b to a preheating temperature.

[0073] Meanwhile, the pre-heating member 120 includes a first moving body 125 that moves the first heating body 121 toward the seal portion 12b of the pouch 12 or moves it to an initial position, and a second moving body 126 that moves the second heating body 122 toward each of the pair of sealing blocks 110 or moves it to an initial position. The first moving body 125 or the second moving body 126 may be a cylinder.

[0074] Therefore, the secondary battery manufacturing apparatus 100 according to the second embodiment of the present invention includes a first moving body 125 and a second moving body 126, and is therefore able to adjust the distance between the seal portion 12b of the pouch 12 and the first heating body 121, and the distance between the pair of seal blocks 110 and the second heating body 122, thereby enabling the seal portion 12b of the pouch 12 and the pair of seal blocks to be preheated more uniformly and stably to the preheating temperature.

[0075] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and various embodiments are possible within the meaning and scope of the claims and their equivalents. [Explanation of symbols]

[0076] 10 Secondary battery 11 Electrode assembly 12 pouches 12a Storage section 12b Seal part 13 Electrode Lead 14 Lead Film 100 Secondary battery manufacturing equipment 110 Seal Block 120 Preheating member 121 First heating element 122 Second heating element 123 Temperature Sensor 124 Control Unit 125 First Mobile Unit 126 Second Mobile Unit

Claims

1. a pair of seal blocks that are disposed on each side of the sealed portion of the pouch from which the electrode leads are drawn, and that crimp and seal the sealed portion at a predetermined temperature and a predetermined pressure; A secondary battery manufacturing apparatus including a preheating member that preheats the pouch seal portion and the pair of seal blocks to a preheating temperature, The preheating member is a first heater for preheating the surface of the seal portion where the pair of seal blocks are located to a preheat temperature; a second heater that preheats the surfaces of the pair of seal blocks facing the seal portion to a preheat temperature.

2. 2. The secondary battery manufacturing apparatus of claim 1, wherein the preheating temperature of the seal portion preheated by the first heater and the preheating temperature of the pair of seal blocks preheated by the second heater are the same or different from each other.

3. 3. The secondary battery manufacturing apparatus of claim 2, wherein when the preheating temperature of the seal portion preheated by the first heating element and the preheating temperature of a pair of seal blocks preheated by the second heating element are different from each other, the preheating temperature of the seal portion preheated by the first heating element is lower than the preheating temperature of a pair of seal blocks preheated by the second heating element.

4. 2. The secondary battery manufacturing apparatus according to claim 1, wherein the preheating temperature is set to 100°C to 230°C.

5. The secondary battery manufacturing apparatus according to claim 1 , wherein the first heater and the second heater are provided as heat lamps.

6. The secondary battery manufacturing apparatus of any one of claims 1 to 5, wherein the preheating member further includes a temperature detection sensor that detects the temperature of each of the sealed portions of the pouch and the pair of seal blocks, and a control unit that stops the preheating of the sealed portions of the pouch and the pair of seal blocks by stopping the operation of the first heating element and the second heating element when the temperature detected by the temperature detection sensor rises to a preheating temperature.

7. 2. The secondary battery manufacturing apparatus of claim 1, wherein the preheating member further includes a first moving body that advances the first heating body toward the sealing portion or returns it to its initial position, and a second moving body that moves the second heating body toward each of a pair of sealing blocks or returns it to its initial position.

8. The secondary battery manufacturing apparatus according to claim 1 , wherein the preheating temperature is lower than the sealing temperature.

9. a transferring step of transferring a secondary battery, the secondary battery including an electrode assembly and a pouch accommodating the electrode assembly; a disposing step of disposing a pair of seal blocks on both sides of a seal portion formed on a pouch of the secondary battery and through which an electrode lead is drawn out; a preheating step of preheating the surfaces of the seal portions of the pouches and the pair of seal blocks corresponding to each other to a preheating temperature using a preheating member; a sealing step of heating the seal block preheated to the preheat temperature up to the sealing temperature, and then crimping and sealing the seal portion of the pouch preheated to the preheat temperature; The preheating step includes a process of preheating the surface of the seal portion where the pair of seal blocks are located to a preheat temperature using a first heating element of a preheating member, and a process of preheating the surface of the pair of seal blocks facing the seal portion to a preheat temperature using a second heating element of a preheating member.

10. 10. The method for manufacturing a secondary battery according to claim 9, wherein in the preheating step, a preheating temperature of the seal portion preheated by the first heating element and a preheating temperature of the pair of seal blocks preheated by the second heating element are the same temperature or different temperatures from each other.

11. 11. The method for manufacturing a secondary battery according to claim 10, wherein, in the preheating step, when the preheating temperature of the seal portion preheated by the first heating element and the preheating temperature of the pair of seal blocks preheated by the second heating element are different from each other, the preheating temperature of the seal portion preheated by the first heating element is lower than the preheating temperature of the pair of seal blocks preheated by the second heating element.

12. The method for manufacturing a secondary battery according to claim 9, wherein the preheating temperature is set to 100°C to 230°C.

13. The method of manufacturing a secondary battery according to claim 9 , wherein the first heater and the second heater are heating lamps.

14. The method for manufacturing a secondary battery according to any one of claims 9 to 13, wherein the preheating step further includes a step of detecting the temperature of the seal portion of the pouch and the pair of seal blocks via a temperature detection sensor, and a step of stopping the preheating of the seal portion of the pouch and the pair of seal blocks via a control unit by stopping the operation of the first heating element and the second heating element when the temperature detected by the temperature detection sensor rises to a preheating temperature.

15. The method of manufacturing a secondary battery according to claim 9 , wherein the transferring step further comprises a temporary preheating step of heating a seal portion formed on a pouch of the secondary battery during transfer.

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