Secondary battery sealing device

Abstract

A secondary battery sealing device according to one example of the present invention comprises: a pair of sealing blocks on which a battery cell is placed and which are provided so as to press a bonding target region of a pouch of the placed battery cell and a lead film; and a pair of lead blocks on which leads of the battery cells exposed to the outside of the pouch are seated, and which are provided to cover the seated leads, in which at least one of the pair of lead blocks is provided with a recessed portion for accommodating the leads.

Description

Technical Field

[0001] The present invention relates to a secondary battery sealing device capable of minimizing lead damage and lead heat loss during a sealing process of a pouch type secondary battery.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0022551, dated February 21, 2023, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0003] The secondary battery may be classified into a coin-type secondary battery, a rectangular secondary battery, a cylindrical secondary battery, a pouch-type secondary battery, and the like according to the shape of a battery case.

[0004] In particular, pouch-type secondary batteries have advantages of simple structure, high capacity per unit volume, low manufacturing cost, light weight, and easy shape change. Therefore, recently, pouch-type secondary batteries in which battery cells laminated with electrodes and separators are packaged in aluminum pouches are widely used.

[0005] The pouch-type secondary battery is formed by sequentially performing a slurry mixing process, an electrode (positive electrode material / negative electrode material) coating process, an electrode plate pressing process, an electrode plate slitting process and an electrode plate punching / notching process, an electrode plate drying process, an electrode plate lamination process, an electrode plate stacking process, a pouch packaging process, an electrolyte injection process, a formation process, and a pouch degassing process.

[0006] At this time, in the packaging process, the electrode assembly in which the electrodes and the separators are alternately laminated is packaged with a bag, and when the bag is packaged, a pair of leads electrically connected to the electrode assembly of the electrodes are exposed to the outside of the bag. In addition, the packaging process includes a sealing process of combining the bag and the leads through a lead film.

[0007] Figure 1 and Figure 2 is a diagram for explaining a conventional secondary battery sealing device and a lead block, Figure 3 is used to indicate that the leads of the battery cell are placed Figure 1 The diagram showing the state of the lead block, Figure 4 Is used to explain when using Figure 3 FIG. 1 is a diagram showing the positions of a battery cell, a pair of sealing blocks, and a pair of lead blocks when a conventional secondary battery sealing device performs a sealing process.

[0008] Reference Figures 1 to 4 A conventional secondary battery sealing device 1 includes: a main body 2; a pair of sealing blocks 10, which are arranged on the main body 2 and used to combine the sealing target areas of the battery cells 3; and a pair of lead blocks 20, which are respectively arranged on the pair of sealing blocks 10, and on which the leads 4 of the battery cells 3 exposed to the outside of the bag are placed.

[0009] In this case, the first sealing block 12 and the first lead block 22 are provided on the lower side of the battery cell 3, the first sealing block 12 supports the lower side of the battery cell 3 and the battery cell 3 is placed on the first sealing block 12, and the first lead block 22 is provided on the first sealing block 12 so that the lead 4 of the battery cell 3 is placed on the first lead block 22. In addition, the second sealing block 14 and the second lead block 24 are provided on the upper side of the battery cell 3, the second sealing block 14 is used to press the battery cell 3 placed on the first sealing block 12, and the second lead block 24 is provided on the second sealing block 14 to cover the lead 4 of the battery cell 3 placed on the first lead block 22.

[0010] During the bag sealing process, the heat applied to the first sealing block 12 and the second sealing block 14 is used to melt the sealant coated on the lead film 5 and the bag (not shown), thereby sealing the lead 4 and the bag. In the process of sealing the lead 4 and the bag by the first sealing block 12 and the second sealing block 14, there is a problem that the lead film 5 made of polypropylene (PP) cannot be properly melted only by the heat of the first sealing block 12 and the second sealing block 14.

[0011] In order to solve this problem, heating members (not shown) are also provided on the first and second sealing blocks 12 and 14, and the first and second lead blocks 22 and 24, and heat is applied to the first and second lead blocks 22 and 24. Then, the lead 4 provided between the first and second lead blocks 22 and 24 and the lead film connected to the lead 4 also have a certain degree of heat.

[0012] When the battery cell 3 is pressed by the first and second sealing blocks 12 and 14 in this state, the lead film 5 is well melted by the first and second sealing blocks 12 and 14 and the first and second lead blocks 22 and 24 so that it can easily seal the lead 4 and the bag.

[0013] In addition, when the battery cell 3 is pressed by the first sealing block 12 and the second sealing block 14, the lead 4 placed on the opposing surface 23 of the first lead block 23 as a flat surface contacts the opposing surface 23 of the first lead block 22 and the opposing surface 25 of the second lead block 24, respectively. In this case, the opposing surface 23 of the first lead block 22 and the opposing surface 25 of the second lead block 24 have flat surfaces, so that the area in contact with the lead 4 increases, and there is a problem that damage such as scratches occurs on the outer surface of the lead 4.

[0014] To solve this problem, a method in which the first lead block 22 and the second lead block 24 do not directly contact the lead 4 is adopted, such as a method of winding an insulating tape around each of the first lead block 22 and the second lead block 24 .

[0015] However, since a gap g is generated between the first lead block 22 and the second lead block 24 due to the insulating tape wrapped around each of the first lead block 22 and the second lead block 24, and the lead 4 is exposed to the atmosphere through the gap g, there is a problem of heat loss of the lead 4.

[0016] Furthermore, if the first lead block 22 and the second lead block 24 are not in contact with the lead 4 , there is a problem that the original function of the first lead block 22 and the second lead block 24 for supporting the lead 4 is deteriorated. Summary of the invention

[0017] Technical issues

[0018] An object of the present invention is to provide a secondary battery sealing device capable of preventing damage such as scratches on leads caused by contact with lead blocks during a sealing process of a secondary battery.

[0019] Furthermore, an object of the present invention is to provide a secondary battery sealing device capable of preventing heat loss of a lead during a sealing process of a secondary battery.

[0020] Technical Solution

[0021] In order to solve the above-mentioned problems, according to one aspect of the present invention, a secondary battery sealing device is provided as a sealing device for combining a bag and a lead film of a battery cell, the secondary battery sealing device comprising: a pair of sealing blocks, on which the battery cell is placed, and the pair of sealing blocks are configured to press the combination target area of ​​the bag and the lead film of the placed battery cell; and a pair of lead blocks, on which the leads of the battery cell exposed to the outside of the bag are placed, and the pair of lead blocks are configured to cover the placed leads, wherein at least one of the pair of lead blocks is provided with a recessed portion for accommodating the leads.

[0022] Furthermore, the pair of lead blocks may be disposed such that regions other than the recessed portion contact each other along edges of the leads.

[0023] In addition, the width of the recessed portion may be greater than or equal to the width of the lead line.

[0024] In addition, the depth of the recessed portion may be greater than or equal to the thickness of the lead line.

[0025] In addition, when the pair of sealing blocks presses the bonding target area in a state where the lead is placed, the pair of lead blocks may be arranged to cover the placed lead. As an example, each lead block may be respectively arranged on the pair of sealing blocks and may be arranged to be movable together with each sealing block.

[0026] Furthermore, when the lead is accommodated in the recessed portion through the pair of lead blocks, the pair of lead blocks may be arranged to be in surface contact with each other in at least some regions along the edge of the lead except for the region where the recessed portion is formed. In such a structure, when the pair of lead blocks are in contact, the recessed portion may form an accommodation space for the lead, and by confining the heat in the accommodation space, the heat loss of the lead to the outside may be prevented.

[0027] In addition, the pair of sealing blocks may include a first sealing block and a second sealing block, wherein the first sealing block supports the lower side of the battery cell so that the battery cell is placed on the first sealing block, and the second sealing block presses the battery cell placed on the first sealing block when it moves toward the first sealing block.

[0028] In addition, the pair of lead blocks may include a first lead block and a second lead block, the first lead block being connected to the first sealing block so that the lead is placed on the first lead block when the battery cell is placed on the first sealing block, and the second lead block being configured to cover the lead placed on the first lead block when the second sealing block moves toward the first sealing block.

[0029] Furthermore, the recessed portion may be provided in the first lead block.

[0030] In addition, the width of the recessed portion may be greater than or equal to the width of the lead line.

[0031] In addition, the depth of the recessed portion may be greater than or equal to the thickness of the lead line.

[0032] Furthermore, when the lead is covered by the second lead block, respective opposing surfaces of the first lead block and the second lead block may be disposed in surface contact with each other along an edge of the lead except for a region where the recessed portion is formed.

[0033] Furthermore, the lead wire and the lead film exposed to one open surface of the recessed portion may be pressed by the first sealing block and the second sealing block. When the lead wire is covered by the second lead block, the recessed portion may have a structure in which one surface facing the bag is open.

[0034] Furthermore, the recessed portion may be provided in each of the first lead block and the second lead block. In such a structure, a total depth of the recessed portion formed in each lead block may be greater than or equal to a thickness of the lead.

[0035] Beneficial Effects

[0036] As discussed above, one example of the present invention relates to a secondary battery sealing device having the following effects.

[0037] During the sealing process of the secondary battery, the lead of the battery cell exposed to the outside of the bag is covered by the other lead block while being inserted into a recessed portion formed in any one of the pair of lead blocks. Therefore, the portion of the lead exposed to the atmosphere is minimized, so that the heat loss of the lead can be minimized.

[0038] Furthermore, the lead is inserted into the recessed portion of any one lead block and then covered by the other lead block, so that the area contacting the pair of lead blocks can be minimized and appearance damage such as scratches of the lead can be reduced by the pair of lead blocks.

[0039] In particular, damage such as scratches does not occur in the appearance of the lead, so that the appearance defects of the lead can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 and Figure 2 It is a diagram for explaining a conventional secondary battery sealing device and a lead block.

[0041] Figure 3 is used to indicate that the leads of the battery cell are placed Figure 1 The status of the lead block is shown in the figure.

[0042] Figure 4 Is used to explain when Figure 3 FIG. 1 is a diagram showing the positions of a battery cell, a pair of sealing blocks, and a pair of lead blocks when a conventional secondary battery sealing device performs a sealing process.

[0043] Figure 5 is a diagram that enlarges and illustrates a secondary battery sealing device and a lead block according to one example of the present invention.

[0044] Figure 6 It is shown by Figure 5 FIG. 1 is a diagram of a battery cell sealed by a secondary battery sealing device according to an example of the present invention.

[0045] Figure 7 Is used to explain when Figure 5 The diagram shows the positions of a battery cell, a pair of sealing blocks, and a pair of lead blocks when the secondary battery sealing device performs a sealing process.

[0046] Figure 8 The figure shows the lead wires of the battery cell.

[0047] Fig. 9 is a diagram showing a first lead block. DETAILED DESCRIPTION

[0048] Hereinafter, a secondary battery sealing device according to one example of the present invention will be described in detail with reference to the accompanying drawings.

[0049] Furthermore, regardless of reference numerals, the same or corresponding parts are given the same or similar reference numerals, repeated descriptions thereof will be omitted, and the size and shape of each constituent member shown may be exaggerated or reduced for convenience of explanation.

[0050] Figure 5 is a diagram showing an enlarged view of a secondary battery sealing device 100 and a lead block according to an example of the present invention, Figure 6 It is shown by Figure 5 FIG. 1 is a diagram of a battery cell 101 sealed by a secondary battery sealing device according to an example of the present invention.

[0051] The secondary battery sealing device 100 according to one example of the present invention may be used during a pouch packaging process performed between an electrode plate stacking process and an electrolyte injection process among processes of manufacturing a pouch type secondary battery.

[0052] Specifically, the secondary battery sealing device 100 is used in a sealing process for bonding a preset bonding target region S between the pouch 104 of the battery cell 101 and the lead 102 through the lead film 103 of the battery cell 101 .

[0053] Figure 7 Is used to explain when Figure 5 A diagram showing the positions of a battery cell, a pair of sealing blocks, and a pair of lead blocks when the secondary battery sealing device performs a sealing process; Figure 8 is a diagram showing leads of a battery cell; and Fig. 9is a diagram showing a first lead block.

[0054] Reference Figures 5 to 7 According to an example of the present invention, a secondary battery sealing device 100 may include: a pair of sealing blocks 110, which press the battery cell 101; and a pair of lead blocks 120, which are respectively arranged in the pair of sealing blocks 110, and the leads 102 of the battery cell 101 exposed to the outside of the bag are placed on the pair of lead blocks 120, and the pair of lead blocks 120 cover the placed leads 102.

[0055] The pair of sealing blocks 110 is a member for thermally pressing the battery cell 101 , and performs a function of thermally pressing the bonding target area S to seal the bonding target area S. As shown in FIG.

[0056] Reference Figure 6 and Figure 7 The battery cell 101 may be a pouch-type secondary battery, and includes an electrode laminate 101a in which a plurality of electrodes and separators are alternately laminated, and a pouch 104 surrounding the electrode laminate 101a. At this time, the electrode laminate 101a is accommodated inside the pouch 104, and a pair of leads 102 provided at both ends of the electrode laminate 101a are packaged by the pouch 104 to be exposed to the outside of the pouch 104, respectively.

[0057] The secondary battery sealing device 100 includes: a pair of sealing blocks 110, on which the battery cell 101 is placed, and the pair of sealing blocks 110 are configured to press the bonding target area S of the bag 104 and the lead film 103 of the placed battery cell 101; and a pair of lead blocks 120, on which the lead 102 of the battery cell 101 exposed to the outside of the bag 104 is placed, and the pair of lead blocks 120 are configured to cover the placed lead 102.

[0058] Furthermore, at least one of the pair of lead blocks 120 is provided with a recessed portion 121 for accommodating the lead 102 .

[0059] Here, a pair of sealing blocks 110 heat-presses a preset bonding target area S between the bag 104 and the lead 102 through the lead film 103 .

[0060] The pair of sealing blocks 110 may include a first sealing block 112 and a second sealing block 114. The first sealing block 112 and the second sealing block 114 may be disposed at a predetermined interval from each other in an up-and-down direction of the body 100a of the secondary battery sealing device 100.

[0061] At this time, a driving part 170 such as a cylinder is connected to at least one of the first sealing block 112 and the second sealing block 114, and the driving part 170 can be set to be able to rise and fall in the main body 100a1. Through the driving part 170, the interval between the first sealing block 112 and the second sealing block 114 can be adjusted, and when the bonding target area S is pressed, at least one of the first sealing block 112 and the second sealing block 114 moves in a direction close to each other, and the interval between the first sealing block 112 and the second sealing block 114 becomes smaller.

[0062] The first sealing block 112 and the second sealing block 114 are pressed against a preset bonding target area S on the battery cell 101 .

[0063] Specifically, the battery cell 101 is seated on the first sealing block 112. For example, a lower surface of the bonding target region S of the battery cell 101 is seated on the first sealing block 112.

[0064] The second sealing block 114 presses the upper surface of the battery cell 101 seated on the first sealing block 112. Specifically, the second sealing block 114 presses the upper surface of the bonding area S of the battery cell 101 seated on the first sealing block 112.

[0065] As an example, the second sealing block 114 may descend in a direction closer to the first sealing block 112 to press the battery cell 101 placed on the first sealing block 112 .

[0066] In addition, the second sealing block 114 and the first sealing block 112 may press against the bonding target area S of the battery cell 101 and transfer heat to the bonding target area S at the same time.

[0067] Here, the first sealing block 112 and the second sealing block 114 may be connected to heating members 161, 162 such as a heater, respectively. Therefore, the first sealing block 112 and the second sealing block 114 receive heat from the connected heating members 161, 162, respectively, thereby thermally pressing the bonding target area S of the battery cell 101. The heating members 161, 162 may also be disposed inside each of the sealing blocks 112, 114, and may also be attached to one surface of the sealing blocks 112, 114.

[0068] In addition, a pair of lead blocks 120 may be disposed on the first sealing block 112 and the second sealing block 114 , respectively.

[0069] The pair of lead blocks 120 are for supporting portions of the leads 102 of the battery cell 10 exposed to the outside of the pouch 104 when the bonding target region S of the battery cell 101 is pressed by the first and second sealing blocks 112 and 114 .

[0070] The pair of lead blocks 120 may include a first lead block 122 and a second lead block 124 .

[0071] The first lead block 122 may be disposed on the first sealing block 112. As an example, the first lead block 122 may be integrally formed with the first sealing block 112, and the first lead block 122 may be connected to the first sealing block 112 at a predetermined interval.

[0072] In addition, the lead 102 of the battery cell 101 seated on the first sealing block 112 is seated on the first lead block 122. Specifically, when the lower surface of the bonding target area S of the battery cell 101 is seated on the first sealing block 112, the lower surface of the lead 102 may be seated on the first lead block 122.

[0073] A recessed portion 121 for accommodating the lead 102 may be formed on an opposing surface 123 of the first lead block 122 facing the second lead block 124 .

[0074] The opposing surface 123 of the first lead block 122 may be flatly formed along the edge except for a region where the recessed portion 121 is formed.

[0075] The second lead block 124 may be disposed on the second sealing block 114 to face the first lead block 122. As an example, the second lead block 124 may be integrally formed with the second sealing block 114, and the second lead block 124 may be connected to the second sealing block 114 at a predetermined interval.

[0076] At this time, unlike the first lead block 122 , the entire facing surface 125 of the second lead block 124 may be flatly formed.

[0077] When the second sealing block 114 descends toward the first sealing block 112 to press the battery cell 101, the second lead block 124 covers the lead 102 placed on the first lead block 122. Specifically, when the second sealing block 114 is pressed against the upper surface of the bonding target area S of the battery cell 101, the second lead block 124 surrounds the upper surface of the lead 102.

[0078] At this time, a region of the opposing surface 123 of the first lead block 122 excluding the recessed portion 121 may be in surface contact with the opposing surface 125 of the second lead block 124 along an edge.

[0079] In addition, in order to accommodate the lead 102 therein, the concave portion 121 of the first lead block 122 may be formed to be recessed inwardly relative to the opposing surface 123 of the first lead block 122. Therefore, the opposing surface 123 of the first lead block 122 has a step between edge regions of the concave portion 121.

[0080] In addition, the recessed portion 121 may be formed only in some areas of the first lead block 122. Alternatively, the recessed portion 121 may also be formed in the entire area of ​​the first lead block 122, but in order to minimize the portion of the lead 102 covered by the first lead block 122 and the second lead block 124 exposed to the atmosphere, it is preferred that the recessed portion 121 is formed only in some areas (e.g., the central area) of the opposing surface 123 except for the edge.

[0081] Reference Figure 8 and Fig. 9 , the width L2 of the recessed portion 121 may be formed to be greater than or equal to the width L1 of the lead 102. Preferably, the width L2 of the recessed portion 121 may be formed to be greater than the width L1 of the lead 102 exposed to the outside of the bag.

[0082] For example, the width L2 of the recessed portion 121 may be formed to be approximately 2 mm to 4 mm greater than the width L1 of the lead 102 , but is not necessarily limited thereto.

[0083] In addition, the depth D2 of the recessed portion 121 may be formed to be greater than or equal to the thickness D1 of the lead 102. Preferably, the depth D2 of the recessed portion 121 may be formed to be greater than the thickness D1 of the lead 102 exposed to the outside of the pocket.

[0084] For example, the depth D2 of the recessed portion 121 may be formed to be approximately 0.5 mm to 1 mm greater than the thickness D1 of the lead 102 , but is not limited thereto.

[0085] At this time, a pair of lead blocks 120 may be provided with heating members 131, 132, respectively. Heating members 131, 132, such as heaters, may be connected to the first lead block 122 and the second lead block 124, respectively. In such a structure, the first lead block 122 and the second lead block 124 receive heat from the connected heating members 131, 132, respectively, and may heat the lead 102 disposed between the first lead block 122 and the second lead block 124, and the lead film 103 connected to the lead 102. The heating members 131, 132 may also be disposed inside each lead block 122, 124, and may also be attached to one surface of each lead block 122, 124.

[0086] When the lead 102 having a certain amount of heat is accommodated inside the recessed portion 121, the portion of the lead 102 exposed to the atmosphere by the first and second lead blocks 122 and 124 is minimized. Therefore, there is an effect of minimizing heat loss of the lead 102.

[0087] In addition, only some areas of the lead 102 of the battery cell 101 exposed to the outside of the pouch may be inserted into the recessed portion 121. The lead 102 and the lead film 103 not accommodated inside the recessed portion 121 are exposed to the outside of the first and second lead blocks 122 and 124.

[0088] In other words, when the first lead block 122 and the second lead block 124 are in surface contact with each other, the end 102b and both side portions 102a of the lead 102 are inserted into the inside of the recessed portion 121. In this case, the lead film 103 is provided, and the connection portion 102c of the lead 102 adjacent to the electrode assembly is not located inside the recessed portion 121, but is exposed to the outside of the first lead block 122 and the second lead block 124.

[0089] The recessed portion 121 has a bottom surface 121b and a plurality of (e.g., three) side portions 121a connected to the bottom surface 121b. In this case, when the lead 102 is placed on the bottom surface 121b, two of the plurality of side portions 121a face the two side portions 102a of the lead 102, and one side portion 121a faces the end 102b of the lead 102.

[0090] A bonding target region S between the connection portion 102 c of the lead 102 exposed from the first and second lead blocks 122 and 124 and the lead film 103 is thermally pressed and sealed by the first and second sealing blocks 112 and 114 .

[0091] In this way, since the end 102b and two side portions 102a of the lead 102 are accommodated inside the first lead block 122 and the second lead block 124 through the recessed portion 121, the remaining surface of the lead 102 except for the connecting portion 102c on which the lead film 103 is provided is not exposed to the atmosphere, thereby having the effect of minimizing the heat loss of the lead 102.

[0092] As described above, an example in which the recessed portion 121 for accommodating the lead 102 is formed in the first lead block 122 has been described, but the present invention is not limited thereto, and recessed portions may be provided on the first lead block and the second lead block, respectively.

[0093] At this time, the recessed portion (also referred to as “first recessed portion”) formed in the first lead block and the recessed portion (also referred to as “second recessed portion”) formed in the second lead block may also together form an accommodation space for the lead 102 .

[0094] At this time, the total depth of the recessed portion formed in each lead block 122, 124 can be greater than or equal to the thickness of the lead. For example, the thickness of the first recessed portion can be 1 / 2 or more of the lead thickness, and the thickness of the second recessed portion can be 1 / 2 or more of the lead thickness.

[0095] The preferred examples of the present invention as described above are disclosed for illustrative purposes, and those skilled in the art having ordinary knowledge of the present invention will be able to make various modifications, changes and additions within the spirit and scope of the present invention, and such modifications, changes and additions should be considered to fall within the scope of the appended claims.

[0096] Industrial Applicability

[0097] According to a secondary battery sealing device according to one example of the present invention, during a sealing process of a secondary battery pouch, a portion of a lead wire exposed to the atmosphere is minimized, thereby minimizing heat loss of the lead wire.

Claims

1. A secondary battery sealing device for combining a bag and a lead film of a battery cell, comprising: a pair of sealing blocks on which the battery cell is mounted and configured to press against a bonding target area of ​​the bag and the lead film of the mounted battery cell; as well as a pair of lead blocks on which leads of the battery cells exposed to the outside of the bag are placed, and the pair of lead blocks are configured to cover the placed leads, wherein At least one of the pair of lead blocks is provided with a recessed portion for accommodating the lead.

2. The secondary battery sealing device according to claim 1, wherein The pair of lead blocks are disposed such that regions excluding the recessed portions are in contact with each other along edges of the leads.

3. The secondary battery sealing device according to claim 1, wherein The width of the recessed portion is greater than or equal to the width of the lead line.

4. The secondary battery sealing device according to claim 1, wherein The depth of the recessed portion is greater than or equal to the thickness of the lead.

5. The secondary battery sealing device according to claim 1, wherein When the pair of sealing blocks is pressed against the bonding target region in a state where the lead is seated, the pair of lead blocks is disposed to cover the seated lead.

6. The secondary battery sealing device according to claim 2, wherein When the lead is accommodated in the recessed portion through the pair of lead blocks, the pair of lead blocks are disposed in surface contact with each other in at least some regions along the edges of the lead except for a region where the recessed portion is formed.

7. The secondary battery sealing device according to claim 1, wherein The pair of sealing blocks includes a first sealing block and a second sealing block, the first sealing block supports the lower side of the battery cell so that the battery cell is placed on the first sealing block, and the second sealing block presses the battery cell placed on the first sealing block when the second sealing block moves toward the first sealing block, and The pair of lead blocks includes a first lead block and a second lead block, the first lead block is connected to the first sealing block so that the lead is placed on the first lead block when the battery cell is placed on the first sealing block, and the second lead block is configured to cover the lead placed on the first lead block when the second sealing block moves toward the first sealing block.

8. The secondary battery sealing device according to claim 7, wherein The recessed portion is provided in the first lead block.

9. The secondary battery sealing device according to claim 7, wherein The width of the recessed portion is greater than or equal to the width of the lead line.

10. The secondary battery sealing device according to claim 7, wherein The depth of the recessed portion is greater than or equal to the thickness of the lead.

11. The secondary battery sealing device according to claim 10, wherein When the lead is covered by the second lead block, respective opposing surfaces of the first lead block and the second lead block are disposed in surface contact with each other along an edge of the lead, excluding a region where the recessed portion is formed.

12. The secondary battery sealing device according to claim 11, wherein The lead and the lead film exposed to one open surface of the recessed portion are pressed by the first sealing block and the second sealing block.

13. The secondary battery sealing device according to claim 7, wherein The recessed portion is provided in each of the first lead block and the second lead block, and A total depth of the recessed portion formed in each lead block is greater than or equal to a thickness of the lead.

14. The secondary battery sealing device according to claim 1, wherein The pair of lead blocks are respectively provided with heating members.

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