Sealing apparatus for secondary battery

Abstract

A sealing apparatus for a secondary battery according to the present invention is a sealing apparatus that seals a battery case in which an electrode assembly is accommodated to manufacture a secondary battery. The secondary battery includes an electrode lead connected to the electrode assembly and extending to the outside of the battery case, the battery case including: a lead sealing portion provided with the electrode lead at an outer circumferential surface in a pressing direction; and a case sealing portion provided only with the battery case. The sealing apparatus includes: a pair of sealing blocks that press the outer circumferential surface of the battery case; and a heating unit provided in the pair of sealing blocks and heating the pair of sealing blocks. The pair of sealing blocks includes: a lead sealing area configured to press the lead sealing portion of the battery case; and a case sealing area configured to press the case sealing portion of the battery case. The heating unit heats the lead sealing area and the case sealing area of the pair of sealing blocks at different temperatures.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2020-0100762, filed on August 11, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a sealing device for secondary batteries. Background Technology

[0004] Unlike primary batteries, secondary batteries are rechargeable and offer greater potential for compact size and high capacity. Consequently, much research is currently underway on secondary batteries. With technological advancements and increasing demand for mobile devices, the need for secondary batteries as an energy source is rapidly growing.

[0005] Based on the shape of the battery casing, secondary batteries are classified into coin-shaped batteries, cylindrical batteries, prismatic batteries, and pouch batteries. In these secondary batteries, the electrode assembly installed inside the battery casing is a rechargeable and dischargeable power-generating element with a structure of stacked electrodes and separators.

[0006] Electrode assemblies can generally be classified as follows: jelly-roll type, in which a separator is inserted between each positive and negative electrode in the form of a sheet coated with active material and then wound up; stacked type, in which multiple positive and negative electrodes are sequentially stacked with a separator between them; and stacked / folded type, in which the stacked cell is wound together with a separator having a longer length.

[0007] Additionally, when manufacturing a secondary battery according to the relevant technology, the electrode assembly is housed in a bag. Then, the outer periphery of the bag is pressed from the top and bottom sides using a sealing tool and heated before being sealed.

[0008] Here, in the sealed portion of the bag, the area where the electrode leads between the bags are located experiences heat loss due to the electrode leads. Consequently, the temperature in this area becomes lower than the temperature in the area where only bags are present without electrode leads. Furthermore, correspondingly, the temperature of this area of ​​the sealing tool used to press the sealed portion where the electrode leads are located locally becomes lower.

[0009] Therefore, since the sealing part is not sealed at a uniform temperature, it is difficult to ensure uniform sealing quality.

[0010] [Prior Art Documents] (Patent Document 1) Korean Patent Publication No. 10-2014-0015647 Summary of the Invention

[0011] Technical issues

[0012] One aspect of the present invention is to provide a sealing device for secondary batteries that can ensure uniform sealing quality.

[0013] Technical solution

[0014] A sealing device for a secondary battery according to an embodiment of the present invention is a sealing device for sealing a battery casing housing an electrode assembly to manufacture a secondary battery. The secondary battery includes electrode leads connected to the electrode assembly and extending to the outside of the battery casing. The battery casing includes: a lead sealing portion on its outer peripheral surface in a pressing direction where the electrode leads are disposed; and a casing sealing portion consisting only of the battery casing. The sealing device includes: a pair of sealing blocks that press the outer peripheral surface of the battery casing; and a heating unit disposed in the pair of sealing blocks and heating the pair of sealing blocks. The pair of sealing blocks includes: a lead sealing region configured to press the lead sealing portion of the battery casing; and a casing sealing region configured to press the casing sealing portion of the battery casing. The heating unit can heat the lead sealing region and the casing sealing region of the pair of sealing blocks at different temperatures.

[0015] Alternatively, a secondary battery according to an embodiment of the present invention can be manufactured using a sealing device for a secondary battery according to an embodiment of the present invention.

[0016] Beneficial effects

[0017] According to the present invention, during sealing, the battery casing is pressed and heated by a pair of sealing blocks, and the pair of sealing blocks are heated by a heating unit. The lead sealing region, where the electrode leads are located, and the casing sealing region, where only the battery casing is located, are heated at different temperatures. Therefore, uniform sealing quality can be ensured.

[0018] Here, the heating unit performs heating so that the temperature of the lead sealing area in the pair of sealing blocks is higher than the temperature of the housing sealing area. Therefore, it prevents the temperature of the lead sealing area from becoming relatively lower than the temperature of the housing sealing area due to heat loss from the electrode leads. Thus, the pair of sealing blocks are maintained at a uniform temperature, thereby easily ensuring uniform sealing quality. Attached Figure Description

[0019] Figure 1 This is an exemplary front view of a sealing device for a secondary battery according to an embodiment of the present invention.

[0020] Figure 2 This is an exploded plan view of a secondary battery used in a sealing device for a secondary battery according to an embodiment of the present invention.

[0021] Figure 3 This is a plan view showing a secondary battery applied in a sealing device for a secondary battery according to an embodiment of the present invention.

[0022] Figure 4 This is a front view showing the state of a secondary battery being pressed by a sealing device for a secondary battery according to an embodiment of the present invention.

[0023] Figure 5 This is an exemplary front view of a sealing device for a secondary battery according to another embodiment of the present invention.

[0024] Figure 6 This is a front view showing the state of a secondary battery being pressed by a sealing device for a secondary battery according to another embodiment of the present invention. Detailed Implementation

[0025] The objectives, specific advantages, and novel features of the present invention will become clearer from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this application, when assigning reference numerals to elements in each drawing, it should be noted that although the same elements are shown in different drawings, the same elements will be assigned the same reference numerals if possible. However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein. Furthermore, in describing the present invention, detailed descriptions related to well-known functions will be omitted so as not to unnecessarily obscure the subject matter of the invention.

[0026] Sealing device for secondary batteries according to one embodiment

[0027] Figure 1 This is an exemplary front view of a sealing device for a secondary battery according to an embodiment of the present invention. Figure 2 This is an exploded plan view of a secondary battery used in a sealing device for a secondary battery according to an embodiment of the present invention. Figure 3 This is a plan view showing a secondary battery applied in a sealing device for a secondary battery according to an embodiment of the present invention. Figure 4 This is a front view showing the state of a secondary battery being pressed by a sealing device for a secondary battery according to an embodiment of the present invention.

[0028] Reference Figures 1 to 4According to an embodiment of the present invention, a sealing device 100 for a secondary battery is a sealing device 100 for sealing a battery casing 11 to manufacture a secondary battery 10, and includes: a pair of sealing blocks 130 for pressing the outer peripheral surface 11d of the battery casing 11; and a heating unit 140 disposed in the pair of sealing blocks 130 and for heating the pair of sealing blocks 130. The pair of sealing blocks 130 includes: lead sealing regions E1 and E2 for pressing the lead sealing portion P1 of the battery casing 11; and housing sealing regions C1 and C2 for pressing the housing sealing portion P2 of the battery casing 11.

[0029] The sealing device for a secondary battery according to an embodiment of the present invention will be described in more detail below.

[0030] According to an embodiment of the present invention, a sealing device 100 for a secondary battery seals a battery casing 11 containing an electrode assembly 12 to manufacture a secondary battery 10.

[0031] Reference Figure 2 and Figure 3 The secondary battery 10 may include electrode leads 13, which are connected to the electrode assembly 12 and extend to the outside of the battery housing 11.

[0032] The electrode assembly 12 is a rechargeable and dischargeable power generating element having a structure in which electrodes and diaphragms are alternately stacked and combined.

[0033] The electrodes may include a positive electrode and a negative electrode. Furthermore, the positive and negative electrodes are separated by a diaphragm and are electrically insulated from each other.

[0034] A receiving portion 11c may be formed inside the battery casing 11 to accommodate the electrode assembly 12.

[0035] In addition, the battery housing 11 may include an upper housing 11b and a lower housing 11a.

[0036] In addition, the battery housing 11 can be sealed by sealing the outer peripheral surface 11d, which serves as the edge of the upper housing 11b and the lower housing 11a.

[0037] In addition, refer to Figure 1 and Figure 3 The battery housing 11 may include: a lead sealing portion P1 having an electrode lead 13 provided on the outer peripheral surface 11d in the pressing direction; and a housing sealing portion P2 having only the battery housing 11.

[0038] Here, in the lead sealing part P1, the electrode lead 13 can be disposed between the battery housing 11 and the battery housing 11 in the pressing direction. That is, the lead sealing part P1 can be provided with the upper housing 11b and the lower housing 11a of the battery housing 11, as well as the electrode lead 13 between the upper housing 11b and the lower housing 11a.

[0039] Furthermore, in the housing sealing portion P2, only the battery housing 11 may be provided in the pressing direction, without the electrode leads 13. That is, the housing sealing portion P2 may include an upper housing 11b and a lower housing 11a of the battery housing 11.

[0040] Reference Figure 1 , Figure 3 and Figure 4 A pair of sealing blocks 130 can press and seal the outer peripheral surface 11d of the battery housing 11. Here, in the plan view, among the portions of the outer peripheral surface 11d of the battery housing 11 in four directions, the pair of sealing blocks 130 can press and seal the portion in the direction where the electrode leads 13 are located. For example, the electrode leads 13 are provided on both sides of the battery housing 11, and the pair of sealing blocks 130 can seal two sides of the outer peripheral surface 11d of the battery housing 11.

[0041] In addition, the pressing surfaces of the pair of sealing blocks 130 may have a shape corresponding to the outer surface of the battery casing 11.

[0042] In addition, the pair of sealing blocks 130 may include: lead sealing regions E1 and E2 for pressing the lead sealing portion P1 of the battery housing 11; and housing sealing regions C1 and C2 for pressing the housing sealing portion P2 of the battery housing 11.

[0043] In addition, a pair of sealing blocks 130 can press the lead sealing part P1 and the housing sealing part P2 of the battery housing 11 with different pressures.

[0044] Here, for example, a pair of sealing blocks 130 can press the lead sealing portion P1 and the housing sealing portion P2 of the battery housing 11 with the same pressure. Therefore, the outer peripheral surface 11d of the battery housing 11 can be pressed and sealed evenly.

[0045] Alternatively, for example, a pair of sealing blocks 130 can press the lead sealing portion P1 of the battery housing 11 with a higher pressure than the housing sealing portion P2. Therefore, a more robust seal can be formed between the battery housing 11 and the electrode leads 13 of the battery housing 11. This provides a more robust seal quality, enhancing the reliability of the secondary battery 10.

[0046] In addition, the pair of sealing blocks 130 may include an upper sealing block 110 located above the battery housing 11 and a lower sealing block 120 located below the battery housing 11.

[0047] Each of the upper sealing block 110 and the lower sealing block 120 may be configured to be divided into lead sealing regions E1 and E2 and housing sealing regions C1 and C2. Here, the upper sealing block 110 may include an upper housing block 111 forming the upper part of the housing sealing regions C1 and C2, and an upper lead block 112 forming the upper part of the lead sealing regions E1 and E2.

[0048] The lower sealing block 120 may include: a lower housing block 121 forming the lower part of the housing sealing regions C1 and C2, and a lower lead block 122 forming the lower part of the lead sealing regions E1 and E2.

[0049] Additionally, refer to Figure 1 According to an embodiment of the present invention, a sealing device 100 for a secondary battery may further include a moving unit 160 for moving a pair of sealing blocks 130.

[0050] The moving unit 160 may include, for example, a pneumatic or hydraulic actuator.

[0051] In addition, the moving unit 160 may include an upper moving unit for moving the upper sealing block 110 and a lower moving unit for moving the lower sealing block 120.

[0052] Here, the upper moving unit may include: an upper housing moving unit 163 for moving the upper housing block 111, and an upper lead moving unit 161 for moving the upper lead block 112.

[0053] In addition, the lower moving unit may include: a lower housing moving unit 164 for moving the lower housing block 121, and a lower lead moving unit 162 for moving the lower lead block 122.

[0054] In addition, refer to Figure 4 Compared to pressing the housing seal P2 of the battery housing 11 by moving the upper housing block 111 and the lower housing block 121 through the upper housing moving unit 163 and the lower housing moving unit 164, a stronger pressing force can be applied when pressing the lead seal P1 of the battery housing 11 by moving the upper lead block 112 and the lower lead block 122 through the upper lead moving unit 161 and the lower lead moving unit 162.

[0055] Reference Figure 1 and Figure 4 The heating unit 140 can be disposed in a pair of sealing blocks 130 and heat the pair of sealing blocks 130.

[0056] The heating unit 140 may include: housing sealing heaters 143 and 144 located in housing sealing regions C1 and C2 in a pair of sealing blocks 130; and lead sealing heaters 141 and 142 located in lead sealing regions E1 and E2.

[0057] The heating unit 140 can heat the lead sealing areas E1 and E2 of a pair of sealing blocks 130 and the housing sealing areas C1 and C2 at different temperatures.

[0058] Here, the heating unit 140 can perform heating so that the temperature of the lead sealing regions E1 and E2 in the pair of sealing blocks 130 is higher than the temperature of the housing sealing regions C1 and C2. Therefore, it is possible to prevent the temperature of the lead sealing regions E1 and E2 from becoming relatively lower than the temperature of the housing sealing regions C1 and C2 due to heat loss from the electrode leads 13.

[0059] Here, the heating unit 140 can heat the housing sealing areas C1 and C2 and the lead sealing areas E1 and E2 of a pair of sealing blocks 130, so that the temperature of the housing sealing part P2 and the lead sealing part P1 of the battery housing 11 becomes uniform when the battery housing 11 is pressed.

[0060] Therefore, in order to make the temperature of the housing seal portion P2 and the lead seal portion P1 in the battery housing 11 uniform when sealing the battery housing 11, the heating unit 140 can perform heating so that the temperature of the lead seal regions E1 and E2 in the pair of sealing blocks 130 is higher than the temperature of the housing seal regions C1 and C2. Thus, uniform sealing quality can be ensured.

[0061] In other words, when the battery casing 11 is pressed while being heated, heat loss occurs at the electrode leads 13, causing a localized drop in temperature at the lead seal P1. Corresponding to this heat loss, the lead seal P1 is heated to a higher temperature, thus achieving the desired temperature. Therefore, by this method, the temperatures of the lead seal P1 and the casing seal P2 become more uniform, resulting in improved uniformity and quality of the seal.

[0062] Sealing device for secondary batteries according to another embodiment

[0063] The following will describe a sealing device for a secondary battery according to another embodiment.

[0064] Figure 5 This is an exemplary front view of a sealing device for a secondary battery according to another embodiment of the present invention. Figure 6 This is a front view showing the state of a secondary battery being pressed by a sealing device for a secondary battery according to another embodiment of the present invention.

[0065] Reference Figure 5 and Figure 6According to another embodiment of the present invention, a sealing device 200 for a secondary battery is a sealing device 200 for sealing a battery casing 11 to manufacture a secondary battery 10, and includes: a pair of sealing blocks 230 for pressing the outer peripheral surface of the battery casing 11; and a heating unit 140 disposed in the pair of sealing blocks 230 and for heating the pair of sealing blocks 230. The pair of sealing blocks 230 includes: lead sealing regions E1 and E2 for pressing the lead sealing portion P1 of the battery casing 11; and housing sealing regions C1 and C2 for pressing the housing sealing portion P2 of the battery casing 11.

[0066] The sealing device 200 for a secondary battery according to another embodiment of the present invention differs from the sealing device for a secondary battery according to the above-described embodiment of the present invention in that each of the upper sealing block 210 and the lower sealing block 220 of the pair of sealing blocks 230 is formed integrally. Therefore, the present embodiment will focus on the differences from the foregoing embodiment in its description, and repeated descriptions will be omitted and briefly described.

[0067] Reference Figure 2 , Figure 3 and Figure 5 According to another embodiment of the present invention, a sealing device 200 for a secondary battery seals a battery casing 11 containing an electrode assembly 12 to manufacture a secondary battery 10.

[0068] The secondary battery 10 may include electrode leads 13, which are connected to the electrode assembly 12 and extend to the outside of the battery housing 11.

[0069] A receiving portion 11c may be formed inside the battery casing 11 to accommodate the electrode assembly 12.

[0070] In addition, the battery housing 11 may include an upper housing 11b and a lower housing 11a.

[0071] In addition, the battery housing 11 can be sealed by sealing the outer peripheral surface 11d, which serves as the edge of the upper housing 11b and the lower housing 11a.

[0072] In addition, the battery housing 11 may include: a lead sealing portion P1 having an electrode lead 13 provided at the outer peripheral surface 11d in the pressing direction; and a housing sealing portion P2 having only the battery housing 11.

[0073] Here, in the lead sealing part P1, the electrode lead 13 can be disposed between the battery housing 11 and the battery housing 11 in the pressing direction. That is, the lead sealing part P1 can be provided with the upper housing 11b and the lower housing 11a of the battery housing 11, as well as the electrode lead 13 between the upper housing 11b and the lower housing 11a.

[0074] Furthermore, in the housing sealing portion P2, only the battery housing 11 may be provided in the pressing direction, without the electrode leads 13. That is, the housing sealing portion P2 may include an upper housing 11b and a lower housing 11a of the battery housing 11.

[0075] See Figure 3 , Figure 5 and Figure 6 A pair of sealing blocks 230 can press and seal the outer peripheral surface 11d of the battery housing 11. Here, in the plan view, among the portions of the outer peripheral surface 11d of the battery housing 11 in four directions, the pair of sealing blocks 230 can press and seal the portion in the direction where the electrode leads 13 are located. For example, the electrode leads 13 are provided on both sides of the battery housing 11, and the pair of sealing blocks 230 can seal two sides of the outer peripheral surface 11d of the battery housing 11.

[0076] In addition, the pressing surfaces of the pair of sealing blocks 230 may have a shape corresponding to the outer surface of the battery casing 11.

[0077] In addition, the pair of sealing blocks 230 may include: lead sealing regions E1 and E2 for pressing the lead sealing portion P1 of the battery housing 11; and housing sealing regions C1 and C2 for pressing the housing sealing portion P2 of the battery housing 11.

[0078] Furthermore, for example, a pair of sealing blocks 230 can press the lead sealing portion P1 and the housing sealing portion P2 of the battery housing 11 with the same pressure. Therefore, the outer peripheral surface 11d of the battery housing 11 can be pressed and sealed evenly.

[0079] Furthermore, for example, a pair of sealing blocks 230 can press the lead sealing portion P1 and the housing sealing portion P2 of the battery housing 11 with different pressures. Here, the pair of sealing blocks 230 can press the lead sealing portion P1 of the battery housing 11 with a higher pressure than the housing sealing portion P2. Therefore, a more robust seal can be formed between the battery housing 11 and the electrode leads 13 of the battery housing 11. Here, the pressing surfaces of the pair of sealing blocks 230 can have a shape corresponding to the outer surface of the battery housing 11, and the pressing surfaces of the lead sealing regions E1 and E2 are formed to be closer to the outer surface of the battery housing 11 than the pressing surfaces of the housing sealing regions C1 and C2. Therefore, the lead sealing portion P1 of the battery housing 11 can be easily pressed with a higher pressure than the housing sealing portion P2.

[0080] Additionally, the pair of sealing blocks 230 may include an upper sealing block 210 located above the battery housing 11 and a lower sealing block 220 located below the battery housing 11.

[0081] Each of the upper sealing block 210 and the lower sealing block 220 may be integrally formed. Here, each of the upper sealing block 210 and the lower sealing block 220 may further include a heat insulation element 270, which blocks heat transfer between the housing sealing regions C1 and C2 and the lead sealing regions E1 and E2. Therefore, the lead sealing regions E1 and E2 can be easily heated to a higher temperature than the housing sealing regions C1 and C2 by the heating unit 140.

[0082] The heat insulation body may include an upper heat insulation body 271 disposed in the upper sealing block 210 and a lower heat insulation body 272 disposed in the lower sealing block 220.

[0083] In addition, according to another embodiment of the present invention, the sealing device 200 for a secondary battery may further include a moving unit 260 for moving a pair of sealing blocks 230.

[0084] The moving unit 260 may include, for example, a pneumatic or hydraulic actuator.

[0085] In addition, the moving unit 260 may include an upper moving unit 261 for moving the upper sealing block 210 and a lower moving unit 262 for moving the lower sealing block 220.

[0086] The heating unit 140 can be disposed in a pair of sealing blocks 230 and heat the pair of sealing blocks 230.

[0087] The heating unit 140 may include: housing sealing heaters 143 and 144 located in housing sealing regions C1 and C2 in a pair of sealing blocks 230; and lead sealing heaters 141 and 142 located in lead sealing regions E1 and E2.

[0088] The heating unit 140 can heat the lead sealing areas E1 and E2 of a pair of sealing blocks 230 and the housing sealing areas C1 and C2 at different temperatures.

[0089] Here, the heating unit 140 can perform heating so that the temperature of the lead sealing regions E1 and E2 in the pair of sealing blocks 230 is higher than the temperature of the housing sealing regions C1 and C2.

[0090] Here, the heating unit 140 can heat the housing sealing areas C1 and C2 and the lead sealing areas E1 and E2 of a pair of sealing blocks 230, so that the temperature of the housing sealing part P2 and the lead sealing part P1 of the battery housing 11 becomes uniform when the battery housing 11 is pressed.

[0091] Therefore, in order to make the temperature of the housing sealing portion P2 and the lead sealing portion P1 of the battery housing 11 uniform when sealing the battery housing 11, the heating unit 140 can perform heating so that the temperature of the lead sealing regions E1 and E2 in the pair of sealing blocks 230 is higher than the temperature of the housing sealing regions C1 and C2. Thus, uniform sealing quality can be ensured. Here, a heat insulation body 270 is provided between the housing sealing regions C1 and C2 and the lead sealing regions E1 and E2, so when the housing sealing regions C1 and C2 and the lead sealing regions E1 and E2 in the pair of sealing blocks 230 are heated by the housing sealing heaters 143 and 144 and the lead sealing heaters 141 and 142, the temperature of the lead sealing regions E1 and E2 can be easily maintained at a higher temperature than that of the housing sealing regions C1 and C2. Therefore, more uniform sealing quality can be ensured.

[0092] Although the present invention has been described in detail through specific embodiments, these embodiments are intended to exemplify the invention, and the invention is not limited thereto. Various modifications can be made by those skilled in the art within the scope of the inventive concept.

[0093] Furthermore, the specific scope of protection of this invention becomes clear from the appended claims.

[0094] [Description of reference numbers]

[0095] 10: Secondary batteries

[0096] 11: Battery casing

[0097] 11a: Lower shell

[0098] 11b: Upper shell

[0099] 11c: Reception section

[0100] 11d: outer peripheral surface

[0101] 12: Electrode assembly

[0102] 13: Electrode leads

[0103] 100, 200: Sealing equipment

[0104] 110, 210: Upper sealing block

[0105] 111: Upper shell block

[0106] 112: Upper lead block

[0107] 120, 220: Lower sealing block

[0108] 121: Lower shell block

[0109] 122: Bottom Lead Block

[0110] 130, 230: A pair of sealing blocks

[0111] 140: Heating unit

[0112] 141, 142: Lead-wire sealed heater

[0113] 143, 144: Shell-sealed heater

[0114] 160, 260: Moving units

[0115] 161: Upper lead wire moving unit

[0116] 162: Lower Lead Wire Moving Unit

[0117] 163: Upper housing moving unit

[0118] 164: Lower housing moving unit

[0119] 261: Upper moving unit

[0120] 262: Lower Moving Unit

[0121] 270: Thermal insulation

[0122] 271: Upper insulation

[0123] 272: Lower insulation

[0124] C1, C2: Sealing area of ​​the housing

[0125] E1, E2: Lead sealing area

[0126] P1: Lead wire sealing part

[0127] P2: Housing sealing part.

Claims

1. A sealing device for a secondary battery, wherein the sealing device seals a battery casing housing an electrode assembly to manufacture a secondary battery. The secondary battery includes electrode leads that are connected to the electrode assembly and extend to the outside of the battery housing. The battery casing includes: A lead wire sealing portion of the electrode lead is provided on the outer peripheral surface in the pressing direction; and Only the housing sealing part of the battery housing is provided. The sealing device mentioned above includes: A pair of sealing blocks are pressed against the outer peripheral surface of the battery casing; and A heating unit disposed within the pair of sealing blocks and for heating the pair of sealing blocks. The pair of sealing blocks includes: The lead sealing area is configured to press the lead sealing portion of the battery housing; and The housing sealing area is configured to press the housing sealing portion of the battery housing. The heating unit heats the lead sealing region and the housing sealing region of the pair of sealing blocks at different temperatures, such that the temperature of the lead sealing region in the pair of sealing blocks is higher than the temperature of the housing sealing region.

2. The sealing device according to claim 1, wherein the heating unit heats the housing sealing region and the lead sealing region of the pair of sealing blocks, such that the temperature of the housing sealing portion and the lead sealing portion of the battery housing becomes uniform when the battery housing is pressed.

3. The sealing device according to claim 1 or 2, wherein the pair of sealing blocks press the lead seal and the housing seal of the battery housing with different pressures.

4. The sealing device according to claim 1, wherein the pair of sealing blocks press the lead seal of the battery housing at a higher pressure than the housing seal.

5. The sealing device according to claim 1, wherein the pair of sealing blocks press the lead seal and the housing seal of the battery housing with the same pressure.

6. The sealing device according to claim 1, wherein the heating unit comprises: The housing-sealed heater is located in the housing sealing region of the pair of sealing blocks; as well as A lead-sealing heater located in the lead-sealing area.

7. The sealing device according to claim 1, wherein the pair of sealing blocks comprises an upper sealing block located above the battery housing and a lower sealing block located below the battery housing. Each of the upper sealing block and the lower sealing block is formed as one unit, and Each of the upper sealing block and the lower sealing block further includes a heat insulation element that blocks heat transfer between the housing sealing region and the lead sealing region.

8. The sealing device according to claim 1, wherein the pair of sealing blocks comprises an upper sealing block located above the battery housing and a lower sealing block located below the battery housing, and Each of the upper sealing block and the lower sealing block is formed in a shape that is divided into the lead sealing region and the housing sealing region.

9. The sealing device according to claim 8, wherein the upper sealing block comprises: An upper housing block forming the upper part of the housing sealing region, and an upper lead block forming the upper part of the lead sealing region, and The lower sealing block includes: a lower housing block forming the lower part of the housing sealing area, and a lower lead block forming the lower part of the lead sealing area.

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