Heat-sealing end socket assembly with segmented pressurizing function and heat-sealing device

Abstract

The utility model discloses a heat-sealing head assembly and a heat-sealing device with a segmented pressurizing function, the heat-sealing head assembly comprises a heat-sealing head and a pressurizing piece, the heat-sealing head is provided with a packaging side and comprises a packaging portion and abutting portions, the abutting portions are located on the two sides of the packaging portion and protrude out of the surface of the packaging portion from the packaging side, and the pressurizing piece is arranged on the sealing portion. The pressurizing piece comprises a first air cylinder and a second air cylinder, the first air cylinder and the second air cylinder abut against the other side, opposite to the packaging side, of the heat-sealing end socket correspondingly, and the first air cylinder and the second air cylinder are connected to a first air channel and a second air channel which can independently control air pressure correspondingly; in the heat sealing device, one or two groups of heat sealing head assemblies can be arranged to serve as the upper sealing head and / or the lower sealing head respectively, so that the pressure applied by the first air cylinder is controlled to be smaller than the pressure applied by the second air cylinder during heat sealing, the deformation generated by the packaging part is reduced or even eliminated, and the consistency of the sealing thickness and the sealing reliability are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically, it relates to a heat-sealing head assembly and heat-sealing device with segmented pressurization function. Background Technology

[0002] Currently, in the manufacturing process of pouch batteries, heat sealing is widely used to seal the casing after the cell is inserted into the casing. Heat sealing is usually completed by the cooperation of an upper and lower sealing head. The upper and lower sealing heads clamp the sealing area from both sides, and the sealing is achieved under the action of temperature and pressure.

[0003] To improve the consistency of the sealing thickness, a notch is usually provided in the middle area of ​​the upper and / or lower end caps. During sealing, the notch cooperates with the opposite end cap to form a sealing area with a rectangular cross-section. The shell is sealed within the sealing area. The presence of the notch limits the sealing position of the shell and also restricts the sealing thickness, ensuring the consistency of the sealing thickness. For example, Chinese utility model patent application number CN201220104085.4 discloses an end cap for soft-pack lithium-ion batteries. By providing a first protrusion and a second protrusion at both ends of the upper and lower end caps, respectively, and having the first and second protrusions arranged opposite each other, the thickness of the aluminum-plastic film encapsulation can be controlled, thereby improving the encapsulation reliability.

[0004] However, in actual use, it was found that although the driving force provided by the drive device to the upper and lower end caps is constant, the thickness of the end cap at the notch is relatively thin. During heat sealing and pressurization, the notch inevitably undergoes slight deformation. Under the influence of slight deformation, the thickness of the sealing area becomes thin in the middle and thick on both sides, which directly affects the thickness consistency of the sealing area and easily leads to false sealing.

[0005] In view of this, this utility model is hereby proposed. Utility Model Content

[0006] The technical problem to be solved by this utility model is to solve one of the problems in the prior art mentioned above, and to provide a heat-sealing head assembly with segmented pressurization function, including a heat-sealing head and a pressurizing component that pressurizes the heat-sealing head during heat sealing. The pressurizing component applies different pressures to both ends and the notch of the heat-sealing head respectively, which can effectively reduce the deformation at the notch and improve the sealing consistency while smoothly applying pressure for sealing.

[0007] This utility model also provides a heat sealing device using the above-mentioned heat sealing head assembly.

[0008] To achieve the above objectives, the first aspect of this utility model provides a heat-sealing head assembly with segmented pressurization function, including a heat-sealing head and a pressurizing member, wherein the heat-sealing head has a sealing side, including a sealing portion for sealing, and abutment portions located on both sides of the sealing portion, the two abutment portions slightly protruding from the sealing portion on one side of the sealing side, and the pressurizing member applies pressure toward the sealing side to the sealing portion and the abutment portions respectively, and the pressure applied to the sealing portion and the abutment portions is independently controlled.

[0009] The above solution improves sealing consistency by controlling the pressure applied to the heat-sealing head's sealing portion and the abutment portion separately, thereby alleviating or even eliminating the micro-deformation of the sealing portion by adjusting the pressure applied to the sealing portion and the abutment portion.

[0010] Furthermore, the pressurizing component includes a first cylinder that applies pressure to the encapsulation portion and a second cylinder that applies pressure to the abutment portion, the first cylinder and the second cylinder applying pressure to the encapsulation portion and the abutment portion respectively from the opposite side to the encapsulation side.

[0011] Furthermore, the pressurizing component includes a first air passage and a second air passage that are independently arranged, and the cylinder that applies pressure to the sealing part and the abutment part is connected to the first air passage and the second air passage respectively.

[0012] Furthermore, the pressurizing component also includes a first control valve located on the first air path and a second control valve located on the second air path. The first control valve and the second control valve are independent of each other and control the air pressure of the first air path and the second air path, respectively.

[0013] Furthermore, the pressurizing component includes two first cylinders that apply pressure to the encapsulation portion, and the two first cylinders are equidistant from the abutment portions on both sides.

[0014] Furthermore, the drive ends of the first and second cylinders are connected to the heat-sealing head; or,

[0015] In the first cylinder and the second cylinder, the drive end of one is connected to the heat-sealing head, while the drive end of the other cylinder is movable and independent of the heat-sealing head.

[0016] In the above scheme, the first cylinder and / or the second cylinder are not only used to apply pressure during heat sealing, but also to drive the heat sealing head to move. There is no need to set up a separate drive device to control the movement of the heat sealing head, which simplifies the structure of the heat sealing head assembly.

[0017] Furthermore, at least one of the upper and lower end caps is configured as a heat-sealing end cap assembly with segmented pressurization function as described in the above scheme.

[0018] Furthermore, the upper and lower end caps have a first position where they abut against each other to form a heat-sealing gap between the encapsulation portion and the opposite end cap, or between two opposite encapsulation portions. The first and second cylinders apply pressure when the upper and lower end caps are in the first position. When pressure is applied, the air pressure in the first air passage is less than the air pressure in the second air passage.

[0019] Furthermore, the first cylinder is connected to the heat-sealing head, and the second cylinder has a first position for applying pressure to the heat-sealing head and a second position for separating from the heat-sealing head;

[0020] After the upper and / or lower end caps are moved into place, the cylinder pressurization assembly in the second air path moves from the second position to the first position to apply pressure to the heat-sealed end caps.

[0021] Furthermore, the heat sealing device also includes a mounting plate located on the side of the upper end cap away from the lower end cap. The first cylinder and the second cylinder are fixed on the side of the mounting plate away from the upper end cap. The mounting plate is provided with through holes for the telescopic rods of the first cylinder and the second cylinder to move.

[0022] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0023] 1. The first cylinder and the second cylinder apply pressure to different positions of the heat-sealing head, and the pressure of the first cylinder is adjusted to be less than that of the second cylinder, which reduces the deformation of the encapsulation part during the heat sealing process and improves the thickness consistency of the battery sealing area.

[0024] 2. The telescopic rod of the first cylinder is connected to the heat-sealing head, eliminating the need for an additional drive device to move the heat-sealing head, thus simplifying the structure of the heat-sealing head assembly.

[0025] 3. The heating device is equipped with a mounting plate to fix the first cylinder and the second cylinder. The working parameters of multiple first cylinders or multiple second cylinders can be set synchronously. Even when pressurizing the heat-sealing head, parameters such as the stroke of the first cylinder and the second cylinder can be set and adjusted synchronously, which greatly simplifies the process parameter setting steps. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a heat-sealing head assembly according to Embodiment 1 of this utility model;

[0027] Figure 2 yes Figure 1 The front view of the heat-sealing head assembly shown;

[0028] Figure 3 This is a schematic diagram showing the connection between the cylinder and the air passage in the heat-sealing head assembly described in Embodiment 1 of this utility model;

[0029] Figure 4 This is a schematic diagram of a heat-sealing head assembly according to Embodiment 2 of this utility model;

[0030] Figure 5 This is a schematic diagram of a heat sealing device according to Embodiment 3 of this utility model;

[0031] Figure 6 This is a schematic diagram of a heat sealing device according to Embodiment 4 of this utility model;

[0032] Figure 7 yes Figure 6 The front view of the heat sealing device shown;

[0033] Figure 8 This is another structural schematic diagram of the heat sealing device described in Embodiment 4 of this utility model;

[0034] Figure 9 yes Figure 8 The heat sealing device shown is a cross-sectional view at point AA.

[0035] In the figure: 1. Heat-sealing head; 11. Encapsulation part; 12. Abutment part; 13. Connecting unit; 2. Pressurizing component; 21. First cylinder; 22. Second cylinder; 23. First air passage; 24. Second air passage; 3. Mounting plate; 31. Cavity; 4. Driving component; 5. Support plate; 51. First support part; 52. Second support part; 6. Lower head. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0037] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] This utility model provides a heat-sealing head assembly with segmented pressurization function, such as... Figures 1 to 9 As shown, it includes a heat-sealing head 1 and a pressure member 2. The heat-sealing head 1 includes a sealing part 11 and an abutment part 12. The sealing part 11 is used to perform a second sealing on the formed battery cell, and the abutment part 12 is used to abut against another head in the heat-sealing device, forming a rectangular sealing gap in the area where the sealing part 11 is located. Therefore, one side of the sealing part 11 protrudes slightly from the surface of the sealing part 11, making the heat-sealing head 1 as a whole "U" shape. The abutment part 12 protrudes from one side of the sealing part 11 to form a sealing side for sealing.

[0040] The pressure member 2 applies pressure to the heat-sealing head 1 from the side opposite to the heat-sealing head 1 and the sealing side. The pressure applied to the sealing part 11 and the abutment part 12 is independently controlled. By controlling the pressure of the sealing part 11 and the abutment part 12, the micro-deformation caused by the pressure on the sealing part 11 is reduced or even eliminated, and the consistency of the thickness of the sealing area is ensured.

[0041] The technical solution of this utility model will now be further described with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] As an embodiment of the present invention, this embodiment provides a heat-sealing head assembly with segmented pressurization function. In this embodiment, the pressurizing member 2 applies pressure to the heat-sealing head 1 from the other side opposite to the encapsulation side of the encapsulation part 11 and the abutment part 12.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, the pressurizing component 2 includes a first cylinder 21 and a second cylinder 22. The first cylinder 21 and the second cylinder 22 each have a telescopic rod that can be extended and retracted under air pressure control. The extension and retraction direction of the telescopic rods on the first cylinder 21 and the second cylinder 22 is directly opposite to the heat-sealing head 1. When extending and retracting to apply pressure to the heat-sealing head 1, they respectively abut against the other side of the sealing part 11 and the abutment part 12 opposite to the sealing side. In order to improve the uniformity of pressurization, the first cylinder 21 and the second cylinder 22 are aligned so that the telescopic rods of the first cylinder 21 and the second cylinder 22 are located in the same plane.

[0045] Furthermore, such as Figure 3 As shown, the pressurizing component 2 also includes a first air passage 23 connected to the first cylinder 21 and a second air passage 24 connected to the second cylinder 22. The air pressure of the first air passage 23 and the second air passage 24 can be controlled independently. In this embodiment, the first air passage 23 and the second air passage 24 are respectively provided with a first control valve for controlling the first air passage 23 and a second control valve for controlling the second air passage 24. The first control valve and the second control valve control the air pressure in the first air passage 23 and the second air passage 24 respectively, thereby adjusting the pressure applied to the first cylinder 21 and the second cylinder 22. In other embodiments, the first air passage 23 and the second air passage 24 can also be connected to air sources with different air pressures to control the pressure of the first cylinder 21 and the second cylinder 22.

[0046] In this embodiment, there are two first cylinders 21 and two second cylinders 22 for pressurizing the encapsulation part 11 and the abutment part 12, respectively. The first cylinders 21 and the second cylinders 22 are located on the same plane. The two second cylinders 22 abut against the two abutment parts 12 located at both ends of the encapsulation part 11, respectively. The two first cylinders 21 are located between the two second cylinders 22. The telescopic rods of the first cylinders 21 and the second cylinders 22 are not directly connected to the heat-sealing head 1, but when the telescopic rods are driven to move to abut against the heat-sealing head 1, they push the heat-sealing head 1 to apply pressure. In order to improve... To ensure uniform pressure application to the heat-sealing head 1, two first cylinders 21 and two second cylinders 22 are symmetrically arranged along the length of the heat-sealing head 1. That is, the distance between the two first cylinders 21 and the adjacent edge of the heat-sealing head 1 is the same, and the distance between the two second cylinders 22 and the adjacent edge of the heat-sealing head 1 is also the same. In this embodiment, the first cylinders 21 and the second cylinders 22 are equally spaced along the length of the heat-sealing head 1. In other embodiments, the number and arrangement of the first cylinders 21 and the second cylinders 22 can also be adjusted according to the actual situation.

[0047] Example 2

[0048] As another embodiment of the present invention, the difference between this embodiment and the first embodiment is that the connection method between the pressure member 2 and the heat-sealing head 1 is different.

[0049] In this embodiment, the telescopic rod of the first cylinder 21 is connected to the heat-sealing head 1, so that the first cylinder 21 can not only pressurize the heat-sealing head 1, but also drive the heat-sealing head 1 to move in the opposite direction of the pressurization direction after the sealing is completed. The telescopic rod of the second cylinder 22 is set independently of the heat-sealing head 1 and only abuts against the heat-sealing head 1 when pressure is applied.

[0050] Specifically, such as Figure 4As shown, the heat-sealing head 1 has a connecting unit 13 on the side away from the sealing side. The number of connecting units 13 is the same as the number of first cylinders 21, and they are positioned opposite to the telescopic rod of the first cylinder 21. The telescopic rod of the first cylinder 21 is connected to the heat-sealing head 1 through the connecting unit 13. In this embodiment, in order to facilitate the connection and separation between the heat-sealing head 1 and the telescopic rod of the first cylinder 21, the connecting unit 13 includes a screw hole for the telescopic rod to extend into. The end of the telescopic rod of the first cylinder 21 has a thread, and the telescopic rod of the first cylinder 21 is connected to the connecting unit 13 by a screw connection. In other embodiments, the telescopic rod of the first cylinder 21 and the heat-sealing head 1 can also be connected by means of snap fasteners, tenons, etc.

[0051] In other embodiments, the telescopic rod of the second cylinder 22 can also be connected to the heat-sealing head 1, that is, the heat-sealing head 1 can also move only under the drive of the second cylinder 22, or by the joint drive of the first cylinder 21 and the second cylinder 22; during the process of the first cylinder 21 and the second cylinder 22 jointly driving the heat-sealing head 1 to move, the ends of the telescopic rods of the first cylinder 21 and the second cylinder 22 always remain flush, and the air pressure provided by the first air passage 23 and the second air passage 24 is consistent.

[0052] This utility model also provides a heat sealing device having the above-mentioned heat sealing head assembly, as detailed below.

[0053] Example 3

[0054] As another embodiment of the present invention, this embodiment provides a heat sealing device having a heat sealing head assembly as described in Embodiment 2.

[0055] In this embodiment, as Figure 5 As shown, the heat sealing device includes an upper sealing head and a lower sealing head 6. The upper sealing head and the lower sealing head 6 move towards each other and clamp the sealing area from both sides of the sealing area for heat sealing. The heat sealing head 1 in the heat sealing head assembly is set as the upper sealing head, and the lower sealing head 6 remains stationary. For ease of explanation, the upper sealing head in the following embodiments actually refers to the heat sealing head 1 in the heat sealing head assembly.

[0056] Furthermore, the heat sealing device also includes a mounting plate 3, which is located on the side of the upper end cap away from the lower end cap 6 and has a gap with the upper end cap. The bodies of the first cylinder 21 and the second cylinder 22 are fixed on the mounting plate 3. As a specific embodiment, the first cylinder 21 and the second cylinder 22 are installed on the side of the mounting plate 3 away from the upper end cap, and the mounting plate 3 has a channel through which the telescopic rods of the first cylinder 21 and the second cylinder 22 pass. In order to avoid opening holes in the mounting plate 3 and improve the strength of the mounting plate 3, in other embodiments, the first cylinder 21 and the second cylinder 22 can also be fixed on the side of the mounting plate 3 facing the upper end cap.

[0057] Furthermore, the telescopic rod of the first cylinder 21 passes through the channel and connects to the upper end cap, which on the one hand fixes the upper end cap, and on the other hand, under the drive of the first cylinder 21, it can realize the relative displacement between the upper end cap and the mounting plate 3. Specifically, the upper end cap has a first position away from the mounting plate 3 under the drive of the first cylinder 21, and a second position close to the mounting plate 3. When it moves to the first position, the upper end cap and the lower end cap 6 cooperate to clamp the sealing area. When it is in the second position, the upper end cap and the lower end cap 6 separate from each other.

[0058] Because the encapsulation portion 11 of the upper end cap is relatively thin, it is more likely to undergo micro-deformation in the direction closer to the lower end cap 6 under pressure. When the upper end cap and the lower end cap 6 cooperate to seal, the pressure applied by the first cylinder 21 should be less than the pressure applied by the second cylinder 22, which reduces the degree of micro-deformation or even avoids the generation of micro-deformation and improves the consistency of the seal thickness. The position where the second cylinder 22 applies pressure to the upper end cap corresponds to the area where the contact portion 12 and the lower end cap 6 abut. While smoothly applying pressure to balance the micro-deformation of the encapsulation portion 11, it can also prevent the encapsulation portion 11 from undergoing reverse deformation in the direction away from the lower end cap 6.

[0059] Furthermore, the heat sealing device described in this embodiment can also be combined with the heat sealing head assembly with segmented pressurization function described in Embodiment 1. In this case, the telescopic rods of the first cylinder 21 and the second cylinder 22 can be independently telescopic relative to the upper head. In order to realize the movement of the upper head between the first position and the second position, a third cylinder is also provided on the mounting plate 3. The telescopic rod of the third cylinder is connected to the upper head. Correspondingly, only when the third cylinder drives the upper head to move to the first position will the first cylinder 21 and the second cylinder 22 be activated and apply pressure to different positions of the upper head respectively.

[0060] The third cylinder can also be replaced with an electric motor that can perform the same function, depending on the actual situation.

[0061] Example 4

[0062] As another embodiment of this utility model, this embodiment provides a heat sealing device, which is further improved based on embodiment three to meet the requirements of battery secondary sealing process.

[0063] In this embodiment, as Figure 6 and Figure 7 As shown, the heat sealing device includes a support plate 5, which is formed on the base of the heat sealing device. The lower end cap 6 protrudes slightly from the support plate 5. The support plate 5 is divided into two parts by the lower end cap 6: a first support part 51 for supporting the battery body, and a second support part 52 located on the other side of the lower end cap 6 for supporting the airbag.

[0064] Correspondingly, such as Figure 8 and Figure 9 As shown, a cavity 31 with an opening facing the lower end cap 6 is formed on the side of the mounting plate 3 facing the upper end cap. The upper end cap is located in the cavity 31. The heat sealing device also includes a driving member 4, which is connected to the side of the mounting plate 3 away from the upper end cap and is used to drive the mounting plate 3 to move along the direction of movement of the upper end cap. During heat sealing, the driving member 4 first drives the mounting plate 3 to move closer to the lower end cap 6, so that the cavity 31 cooperates with the base to form a sealed chamber. At this time, the first support part 51 and the second support part 52 are both located in the sealed chamber, which facilitates puncture and vacuuming processes. Since the upper end cap is connected to the telescopic rod of the first cylinder 21, it can move closer to the lower end cap 6 synchronously with the mounting plate 3. Before cylinder 21 starts working, the upper end cap is in the second position, with a gap between it and the lower end cap 6, ensuring smooth puncture and vacuuming. After puncture and vacuuming are completed, the first cylinder 21 drives the upper end cap to continue approaching the lower end cap 6, moving to the first position to cooperate with the lower end cap 6 and clamp the sealing area. Then, the second cylinder 22 drives the telescopic rod to press against the upper end cap for heat sealing. The thickness consistency of the sealing area is improved by adjusting the pressure applied by the first cylinder 21 and the second cylinder 22. After heat sealing is completed, the second cylinder 22 drives the telescopic rod to retract, and then the first cylinder 21 drives the upper end cap to retract to the second position. Then, the mounting plate 3 and the upper end cap move away from the lower end cap 6 under the drive of the driving component 4, completing the heat sealing action.

[0065] In the above scheme, the puncture process is to physically create a channel for gas to be discharged on the airbag. Therefore, the heat sealing device is also equipped with a puncture structure. In this embodiment, the puncture structure is connected to the puncture cylinder. In order to reduce the overall size of the heat sealing device, the puncture cylinder is also fixed on the mounting part, and the puncture cylinder, the first cylinder 21 and the second cylinder 22 are located on the same side of the mounting plate 3.

[0066] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A heat-sealing head assembly with segmented pressurization function, comprising a heat-sealing head (1) and a pressurizing member (2), wherein the heat-sealing head (1) has a sealing side, including a sealing portion (11) for sealing, and abutment portions (12) located on both sides of the sealing portion (11), wherein one side of the two abutment portions (12) on the sealing side protrudes from the sealing portion (11), characterized in that, The pressure member (2) applies pressure toward the encapsulation side to the encapsulation part (11) and the abutment part (12) respectively, and the pressure applied to the encapsulation part (11) and the abutment part (12) is controlled independently.

2. The heat-sealing head assembly with segmented pressurization function according to claim 1, characterized in that, The pressurizing component (2) includes a first cylinder (21) that applies pressure to the encapsulation portion (11) and a second cylinder (22) that applies pressure to the abutment portion (12). The first cylinder (21) and the second cylinder (22) apply pressure to the encapsulation portion (11) and the abutment portion (12) respectively from the opposite side to the encapsulation side.

3. The heat-sealing head assembly with segmented pressurization function according to claim 2, characterized in that, The pressurizing component (2) includes a first air passage (23) and a second air passage (24) that are independently arranged. The cylinder that applies pressure to the encapsulation part (11) and the abutment part (12) is connected to the first air passage (23) and the second air passage (24) respectively.

4. The heat-sealing head assembly with segmented pressurization function according to claim 3, characterized in that, The pressurizing component (2) also includes a first control valve on the first air passage (23) and a second control valve on the second air passage (24). The first control valve and the second control valve are independent of each other and control the air pressure of the first air passage (23) and the second air passage (24) respectively.

5. The heat-sealing head assembly with segmented pressurization function according to claim 2, characterized in that, The pressurizing component (2) includes two first cylinders (21) that apply pressure to the encapsulation part (11), and the two first cylinders (21) are at the same distance from the two abutment parts (12) on both sides.

6. The heat-sealing head assembly with segmented pressurization function according to claim 2, characterized in that, The drive ends of the first cylinder (21) and the second cylinder (22) are connected to the heat-sealing head (1); or, In the first cylinder (21) and the second cylinder (22), the driving end of one is connected to the heat-sealing head (1), and the driving end of the other is movably set independently of the heat-sealing head (1).

7. A heat sealing device, comprising an upper sealing head and a lower sealing head, characterized in that, At least one of the upper and lower end caps is configured as a heat-sealing end cap assembly with segmented pressurization function as described in any one of claims 1-6.

8. The heat sealing apparatus according to claim 7, characterized in that, The upper and lower end caps are in a first position where they abut against each other for heat sealing. The first cylinder (21) and the second cylinder (22) apply pressure when the upper and lower end caps are in the first position. When the pressure is applied, the air pressure in the first air passage (23) is less than the air pressure in the second air passage (24).

9. The heat sealing apparatus according to claim 8, characterized in that, The first cylinder (21) is connected to the heat-sealing head (1), and the second cylinder (22) has a first position for applying pressure to the heat-sealing head (1) and a second position for separating from the heat-sealing head (1); After the upper and / or lower end caps are moved into place, the cylinder pressurization assembly on the second air passage (24) moves from the second position to the first position to apply pressure to the heat-sealed end cap (1).

10. The heat sealing apparatus according to any one of claims 7-9, characterized in that, It also includes a mounting plate (3), which is located on the side of the upper end cap away from the lower end cap. The first cylinder (21) and the second cylinder (22) are fixed on the side of the mounting plate (3) away from the upper end cap. The mounting plate (3) is provided with through holes for the telescopic rods of the first cylinder (21) and the second cylinder (22) to move.

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