Sealing heads, heat sealing components and heat sealing equipment

Abstract

The utility model relates to the technical field of soft-pack battery cell packaging, and discloses a sealing head, a heat-sealing component and a heat-sealing device, comprising a sealing head body, heat-sealing blocks are arranged at opposite ends of one side surface of the sealing head body, a surface of the sealing head body used for heat-pressing with an aluminum-plastic film of the soft-pack battery cell is set as a first heat-pressing surface, a surface of the heat-sealing block used for heat-pressing with the aluminum-plastic film of the soft-pack battery cell is set as a second heat-pressing surface, the second heat-pressing surface comprises a short-side heat-pressing surface and a long-side heat-pressing surface connected, the short-side heat-pressing surface and the long-side heat-pressing surface are respectively used for heat-pressing with the short side and the long side of the aluminum-plastic film of the soft-pack battery cell; taking the first heat-pressing surface as a reference, the short-side heat-pressing surface is flush with the first heat-pressing surface, and the long-side heat-pressing surface is higher than the short-side heat-pressing surface, so that when the sealing head heat-seals the top edge of the soft-pack battery cell, the short-side heat-pressing surface first contacts the short side of the heat-pressed aluminum-plastic film, and the long-side heat-pressing surface contacts the long side of the heat-pressed aluminum-plastic film later, thereby avoiding reducing the heat-sealing effect of the soft-pack battery cell due to inconsistent melt conditions of the top edge and the side edge.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-pack battery core packaging, in particular to a sealing head, a heat sealing component and a heat sealing device. Background Art

[0002] Soft-pack cells are cells that use aluminum-plastic packaging film (abbreviated as: aluminum-plastic film; aluminum-plastic film includes nylon layer, Al layer and polypropylene layer) as packaging material. The packaging method of soft-pack cells is thermal packaging. The principle of thermal packaging is: place the bare cell in the aluminum-plastic film, then fold the aluminum-plastic film in half, wrap the bare cell, and then put it into the sealing machine for packaging. The two high-temperature sealing heads (upper and lower heads) on the sealing machine are closed and pressed on the aluminum-plastic film, so that the polypropylene layer of the aluminum-plastic film melts and bonds together to achieve heat sealing. Among them, the heat sealing process will form a heat-sealed area at the intersection of the long side of the aluminum-plastic film without the pole ear of the soft-pack cell and the short side of the aluminum-plastic film with the pole ear; the short side heat sealing of the aluminum-plastic film of the soft-pack cell is called the top edge sealing, and the long side heat sealing is called the side edge sealing.

[0003] At present, the existing head seal includes a head body, and heat sealing blocks are arranged at two opposite ends of one side surface of the head body. The heat sealing block and the head body are heat-sealed to form the top edge or side edge of the soft-pack battery cell, so as to increase the effective area of ​​the heat-sealing area. However, the surface of the heat sealing block on the existing head seal used for pressing with the aluminum-plastic film is a flat surface without height difference. When the top edge is heat-sealed, the surface of the heat sealing block used for pressing with the aluminum-plastic film will be pressed on the short side and the long side of the aluminum-plastic film at the same time. Since the melting conditions of the top edge and the side edge are inconsistent, the heat sealing effect of the soft-pack battery cell will be reduced. Utility Model Content

[0004] One of the main purposes of the utility model is to provide a sealing head, a heat sealing assembly and a heat sealing device, aiming to solve the technical problem that the surface of the heat sealing block of the existing sealing head for pressing with the aluminum-plastic film is a flat surface without a height difference, thereby reducing the heat sealing effect of the soft-pack battery cell due to the inconsistent melting conditions of the top sealing edge and the side sealing edge of the soft-pack battery cell.

[0005] In order to achieve the above-mentioned purpose of the utility model, a head according to an embodiment of the utility model includes a head body, and heat-sealing blocks are provided at opposite ends of one side surface of the head body, characterized in that the surface of the head body used for hot pressing with the aluminum-plastic film of the soft-pack battery cell is set as a first hot pressing surface, and the surface of the heat-sealing block used for hot pressing with the aluminum-plastic film of the soft-pack battery cell is set as a second hot pressing surface, the second hot pressing surface includes a short side hot pressing surface and a long side hot pressing surface connected in height, the short side hot pressing surface and the long side hot pressing surface are respectively used for hot pressing with the short side and long side of the aluminum-plastic film of the soft-pack battery cell, and the short side hot pressing surface is flush with the first hot pressing surface; taking the first hot pressing surface as a reference, the long side hot pressing surface is higher than the short side hot pressing surface.

[0006] Furthermore, the height difference between the long side hot pressing surface and the short side hot pressing surface is H, and the relationship satisfied by H is: <H≤0.04mm。

[0007] Furthermore, the side surface of the heat sealing block arranged on the head body is set as a connecting surface, the surface of the heat sealing block facing the other heat sealing block is set as an inner side surface, the inner side surface includes an inclined surface and a flat surface connected by an arc transition, the inclined surface connects the flat surface and the connecting surface, the inclined surface is set at an angle to the connecting surface, the angle between the inclined surface and the connecting surface is an obtuse angle, and the flat surface is perpendicular to the connecting surface.

[0008] Furthermore, the distance between the inclined surface and the R angle of the punching pit of the aluminum-plastic film is 3.1-6.28 mm.

[0009] Furthermore, the angle between the inclined surface and the connecting surface is set to be angle A, and the angle A is 139-152°.

[0010] Furthermore, a shear cut is provided in the sealing area where the long side and the short side of the aluminum-plastic film intersect, and when the long side is folded, the shear cut is used to avoid interference between the long side and the short side, and the spacing between the inclined surface and the edge of the shear cut is 6.11-7.58 mm.

[0011] Furthermore, except for the edge of the surface of the heat sealing block connected to the head body, the edges of other surfaces of the heat sealing block are all set to be chamfered.

[0012] A heat sealing component according to an embodiment of the utility model comprises at least one pair of sealing heads as described in any one of the above embodiments, and each pair of the sealing heads comprises two sealing heads.

[0013] Furthermore, the two heads are respectively an upper head and a lower head, and the upper two ends of the upper head are provided with high-hardness anti-deformation upper limit blocks, and the lower two ends of the lower head are provided with high-hardness anti-deformation lower limit blocks, and each lower limit block corresponds to each upper limit block one by one. When the upper head and the lower head are closed to heat-seal the aluminum-plastic film, each lower limit block is fitted with each upper limit block.

[0014] A heat sealing device according to an embodiment of the utility model comprises the heat sealing component mentioned above.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The sealing head of the utility model is formed by dividing the surface of the heat-sealing block of the sealing head for pressing with the aluminum-plastic film into two, that is, the second heat-pressing surface is divided into a short-side heat-pressing surface and a long-side heat-pressing surface connected at high and low levels; because the pole ear of the soft-pack battery cell is located on the short side of the soft-pack battery cell, the melting state of the heat-sealed short side of the aluminum-plastic film of the soft-pack battery cell is inconsistent with the melting state of the heat-sealed long side of the aluminum-plastic film, that is, the melting state of the top sealing edge and the side sealing edge of the soft-pack battery cell is inconsistent; based on this, with the first heat-pressing surface as the basis The long-side hot-pressing surface is designed to be higher than the short-side hot-pressing surface, and the short-side hot-pressing surface is made flush with the first hot-pressing surface. In this way, when the sealing head is heat-sealing the short side of the aluminum-plastic film of the soft-pack battery cell, the first hot-pressing surface and the short-side hot-pressing surface first contact the short side of the hot-pressed aluminum-plastic film, and the long-side hot-pressing surface later contacts the long side of the hot-pressed aluminum-plastic film, thereby avoiding the short-side hot-pressing surface and the long-side hot-pressing surface contacting the short side and long side of the aluminum-plastic film respectively at the same time, thereby avoiding reducing the heat sealing effect of the soft-pack battery cell due to the inconsistent melt conditions of the top sealing edge and the side sealing edge of the soft-pack battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the head of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0019] Figure 3 This is a schematic structural diagram of the head of the utility model from another angle;

[0020] Figure 4 This is a bottom view of the end cap according to an embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of a soft-pack battery cell according to an embodiment of the utility model;

[0022] Figure 6 This is a schematic structural diagram of a hot-pressed bonding state of an aluminum-plastic film of a sealing head and a soft-pack battery cell according to an embodiment of the utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the embodiment of the utility model when the upper head and the lower head are in a closed state;

[0024] Figure 8 This is a front view of an embodiment of the utility model when the upper head and the lower head are closed;

[0025] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure at E in the middle.

[0026] Numbers in the attached drawings:

[0027] 1. Head body; 10. First hot pressing surface; 101. Connecting surface; 1011. Accommodating groove; 2. Heat sealing block; 20. Second hot pressing surface; 201. Short side hot pressing surface; 202. Long side hot pressing surface; 2021. Short side area; 2022. Long side area; 203. Inclined surface; 204. Flat surface; 205. Horizontal surface; 3. Upper head; 30. Upper limit block; 4. Lower head; 40. Lower limit block; 5. Accommodating space. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In the description of the present invention, it should be understood that the terms "length", "up", "down", "front", "back", "top", "bottom", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] Please refer to Figure 1-Figure 9, the present utility model provides a head, which includes a head body 1. At opposite ends along the length direction on one side of the head body 1, heat-sealing blocks 2 are provided. The surface of the head body 1 for hot-pressing with the aluminum-plastic film of the soft-pack battery cell is set as the first hot-pressing surface 10. The first hot-pressing surface 10 is used for hot-sealing the short side of the aluminum-plastic film of the soft-pack battery cell. The surface of the heat-sealing block 2 for hot-pressing with the aluminum-plastic film of the soft-pack battery cell is set as the second hot-pressing surface 20. The second hot-pressing surface 20 includes a short-side hot-pressing surface 201 and a long-side hot-pressing surface 202 that are connected in a high-low manner. Among them, the short-side hot-pressing surface 201 is used for hot-pressing with the short side of the aluminum-plastic film of the soft-pack battery cell. That is to say, the short-side hot-pressing surface 201 and the long-side hot-pressing surface 202 are equivalent to increasing the sealing area of the cross-region between the short side and the long side of the aluminum-plastic film of the soft-pack battery cell. Based on the first hot-pressing surface 10, the short-side hot-pressing surface 201 is flush with the first hot-pressing surface 10, and the long-side hot-pressing surface 202 is higher than the short-side hot-pressing surface 201.

[0033] In summary, the head of the present utility model divides the surface of the heat-sealing block 2 of the head for pressing with the aluminum-plastic film into two parts to form a stepped surface, that is, the second hot-pressing surface 20 is divided into a short-side hot-pressing surface 201 and a long-side hot-pressing surface 202 that are connected in a high-low manner. Since the tab of the soft-pack battery cell is located on the short-side of the soft-pack battery cell, the melting glue situation of the short-side heat-sealing of the aluminum-plastic film of the soft-pack battery cell is inconsistent with the melting glue situation of the long-side heat-sealing of the aluminum-plastic film. That is to say, the melting glue situation of the top-sealing edge and the side-sealing edge of the soft-pack battery cell is inconsistent. Based on this, with the first hot-pressing surface 10 as the reference, the long-side hot-pressing surface 202 is designed to be higher than the short-side hot-pressing surface 201, and the short-side hot-pressing surface 201 is flush with the first hot-pressing surface 10. In this way, when the head hot-seals the short side of the aluminum-plastic film of the soft-pack battery cell, the first hot-pressing surface 10 and the short-side hot-pressing surface 201 first contact and hot-press the short side of the aluminum-plastic film, and the long-side hot-pressing surface 202 then contacts and hot-presses the long side of the aluminum-plastic film, avoiding the short-side hot-pressing surface 201 and the long-side hot-pressing surface 202 from simultaneously contacting the short side and the long side of the aluminum-plastic film respectively, thereby avoiding reducing the hot-sealing effect of the soft-pack battery cell due to the inconsistent melting glue situation of the top-sealing edge and the side-sealing edge of the soft-pack battery cell.

[0034] In one embodiment, referring to Figure 2 , the height difference H between the long-side hot-pressing surface 202 and the short-side hot-pressing surface 201 satisfies the relationship: 0 < H ≤ 0.04 mm, avoiding the short-side hot-pressing surface 201 from over-hot-pressing the short side of the aluminum-plastic film of the soft-pack battery cell when the long-side hot-pressing surface 202 hot-seals the long side of the aluminum-plastic film of the soft-pack battery cell, and further improving the hot-sealing effect. Among them, H in this embodiment is 0.04 mm. Of course, in other embodiments, H can also be 0.01 mm or 0.03 mm, which is not limited here.

[0035] In one embodiment, referring to Figure 1, the side surface of the heat sealing block 2 provided on the sealing head body 1 is set as the connecting surface 101, and on the connecting surface 101, the surface of one heat sealing block 2 facing the other heat sealing block 2 is set as the inner side surface; the surface of one heat sealing block 2 facing away from the other heat sealing block 2 is set as the horizontal surface 205 perpendicular to the connecting surface 101. Among them, the inner side surface includes an inclined surface 203 and a flat surface 204 connected by an arc transition, the inclined surface 203 connects the flat surface 204 and the connecting surface 101, the inclined surface 203 is set at an angle to the connecting surface 101, the angle between the inclined surface 203 and the connecting surface 101 is an obtuse angle, and the flat surface 204 is perpendicular to the connecting surface 101. It can be seen from this that, referring to Figure 4 , Figure 5 and Figure 6 When heat-sealing the short side of the soft-pack battery cell, the short side region 2021 extending along the short side direction of the soft-pack battery cell on the first hot-pressing surface 10, the short side hot-pressing surface 201 and the long side hot-pressing surface 202 is heat-sealed to form the short side sealing of the soft-pack battery cell, and the long side region 2022 extending along the long side direction of the soft-pack battery cell on the long side hot-pressing surface 202 is heat-sealed to form the long side sealing of the intersection area of ​​the short side and the long side of the soft-pack battery cell. Since the angle between the inclined surface 203 and the connecting surface 101 is an obtuse angle, when heat-sealing the short side of the soft-pack battery cell, it is convenient for the glue to spread evenly, so that the aluminum-plastic film of the soft-pack battery cell can be prevented from storing glue at the junction of the long side and the sealing edge, and the polypropylene layer of the aluminum-plastic film at the junction of the long side and the short side of the soft-pack battery cell can be prevented from being broken during heat sealing, thereby improving the sealing and corrosion resistance of the soft-pack battery cell.

[0036] In one embodiment, referring to Figure 6 , the angle between the inclined surface 203 and the connecting surface 101 is set to angle A, and angle A is 139-152°. In the present embodiment, angle A is 142°. Since the edge of the aluminum-plastic film to be heat-sealed is between the inclined surfaces 203 of the two heat-sealing blocks 2 during the heat-sealing process of the aluminum-plastic film, setting angle A to an obtuse angle can avoid the spacing between the inclined surface 203 and the R angle of the punching pit of the aluminum-plastic film being too small, which is not conducive to the discharge of the glue generated by the heat-sealed aluminum-plastic film; if angle A is an acute angle, then the spacing between the inclined surface 203 and the R angle of the punching pit of the aluminum-plastic film will be too small, which is not conducive to the discharge of glue. Of course, in other embodiments, angle A can also be 139° or 152°, which is not limited here.

[0037] In one embodiment, referring to Figure 6, the distance between the inclined surface 203 and the R corner of the aluminum-plastic film is the glue removal space C. When the head is heat-sealed to the soft-pack battery cell, the distance between the inclined surface 203 and the R corner of the aluminum-plastic film is 3.1 to 6.28 mm, that is, the glue removal space C is designed to be 3.1 to 6.28 mm, so that the glue removal space C can be prevented from being less than 3 mm, which is not conducive to glue removal. In this embodiment, the glue removal space C is 4.38 mm; of course, in other embodiments, the glue removal space C can also be set to 3.1 mm or 6.28 mm, which is not limited here.

[0038] In one embodiment, referring to Figure 5 , Figure 6 In order to reduce the width of the soft-pack battery cell, the long side of the soft-pack battery cell needs to be folded. Therefore, the sealing area where the long side and the short side of the aluminum-plastic film intersect is usually cut with a shearing notch. The shearing notch is a notch cut by a machine in the sealing area where the long side and the short side of the aluminum-plastic film intersect. Figure 5 As shown. In this way, when the long side of the soft-pack battery cell is folded, the cut can avoid the interference between the long side of the soft-pack battery cell and the short side of the soft-pack battery cell. Based on this, when the head is heat-sealed to the soft-pack battery cell, the distance between the inclined surface 203 and the edge of the cut is 6.11 to 7.58 mm; wherein, the distance between the inclined surface 203 and the edge of the cut is set to the seal width B, that is, the seal width B is 6.11 to 7.58 mm. The seal width B of this embodiment is 6.77 mm. Of course, in other embodiments, the seal width can also be set to 6.11 mm or 7.58 mm, which is not limited here.

[0039] In summary, when the sealing head of the utility model is used to heat-seal the short side of the soft-pack battery cell, the above-mentioned heat sealing block 2 is used to ensure that the effective sealing width B is ≥6mm after the machine cutting and shearing, and at the same time, the glue discharge space C is ≥3mm, thereby avoiding the glue squeezing phenomenon of the soft-pack battery cell during the heat sealing process, and at the same time solving the abnormality of the effective sealing width B <6mm after the machine cutting and shearing in the later process, thereby improving the safety performance of the soft-pack battery cell.

[0040] In one embodiment, referring to Figure 1 Except for the edge of the surface of the heat sealing block 2 connected to the head body 1, the edges of other surfaces of the heat sealing block 2 are set to be chamfered, which can further facilitate the glue removal and prevent the contour edge of the heat sealing block 2 from scratching the aluminum-plastic film of the soft-pack battery cell.

[0041] A heat sealing assembly according to an embodiment of the present invention comprises at least one pair of sealing heads as described in any one of the above embodiments, and each pair of sealing heads comprises two sealing heads. Figure 7 The two heads are upper head 3 and lower head 4. Figure 5 , Figure 6 and Figure 7When the heat-sealing assembly heat-seals the short side of the soft-pack battery cell, the upper head 3 and the lower head 4 are closed and pressed on the aluminum-plastic film of the soft-pack battery cell, that is, the first hot-pressing surface 10, the short-side hot-pressing surface 201 and the long-side hot-pressing surface 202 of the upper head 3 are hot-pressed on the upper surface of the aluminum-plastic film of the soft-pack battery cell, and the first hot-pressing surface 10, the short-side hot-pressing surface 201 and the long-side hot-pressing surface 202 of the lower head 4 are hot-pressed on the lower surface of the lower aluminum-plastic film of the soft-pack battery cell. After the upper head 3 and the lower head 4 are molded together, the polypropylene layer of the upper aluminum-plastic film and the lower aluminum-plastic film are melted and bonded together to achieve heat sealing.

[0042] Of course, refer to Figure 1 and Figure 8 The first hot pressing surfaces 10 of the upper head 3 and the lower head 4 are both provided with a receiving groove 1011. After the upper head 3 and the lower head 4 are molded together, the receiving groove 1011 on the head body 1 of the upper head 3 and the receiving groove 1011 on the head body 1 of the lower head 4 form a receiving space 5 for accommodating the pole ear of the soft-pack battery cell.

[0043] In one embodiment, the heat sealing assembly may be provided with two pairs of heads, one pair of heads clamping and heat-sealing one short side of the soft-pack battery cell, and the other pair of heads clamping and heat-sealing the other short side of the soft-pack battery cell. That is, the two pairs of heads can heat-seal the two short sides of the soft-pack battery cell respectively. In this way, the two short sides of the soft-pack battery cell can be heat-sealed at the same time, thereby improving the heat sealing efficiency.

[0044] In one embodiment, referring to Figure 7 The upper end cap 3 is provided with high-hardness anti-deformation upper limit blocks 30 at the opposite ends, and the lower end cap 4 is provided with high-hardness anti-deformation lower limit blocks 40 at the opposite ends. Each lower limit block 40 corresponds to each upper limit block 30 one by one. When the upper end cap 3 and the lower end cap 4 are closed to heat-seal the aluminum-plastic film of the soft-pack battery cell, each lower limit block 40 fits with each upper limit block 30. Since the upper limit block 30 and the lower limit block 40 are made of SKD11 (high-carbon high-chromium alloy tool steel), the upper limit block 30 and the lower limit block 40 have the characteristics of high hardness and anti-deformation. In this way, the distance D (such as Fig. 9 The dimensions of the battery (as shown) are stable, thus ensuring the heat sealing effect of the soft-pack battery cell.

[0045] Specifically, the thickness of the aluminum-plastic film of the soft-pack battery cell is 152 μm, that is, if the thickness of the upper aluminum-plastic film is 152 μm, the thickness of the lower aluminum-plastic film is also 152 μm, then the total thickness of the upper aluminum-plastic film and the lower aluminum-plastic film is 304 μm. Figure 1 , Figure 5 , Figure 6 and Figure 7When the upper sealing head 3 and the lower sealing head 4 are closed to heat-seal the aluminum-plastic film of the soft-pack battery cell, the upper limit block 30 and the lower limit block 40 are fitted, and the spacing between the first hot pressing surface 10 of the upper sealing head 3 and the first hot pressing surface 10 of the lower sealing head 4 is 260μm, so the hot pressing depth between the upper aluminum-plastic film and the lower aluminum-plastic film is 44μm (the formula is: 304-260=44), so the melting rate of the upper aluminum-plastic film and the lower aluminum-plastic film is 14.47% (the formula is: 44 / 304*100%=14.47%).

[0046] In summary, the sealing head of the present invention can ensure the stability of the hot pressing depth between the upper aluminum-plastic film and the lower aluminum-plastic film through the upper limit block 30 and the lower limit block 40 with high hardness and anti-deformation elasticity, thereby improving the heat sealing effect of the soft-pack battery cell.

[0047] In one embodiment, the head body 1 and the heat sealing block 2 are integrally formed, and the head body 1 and the heat sealing block 2 can also be fixed by bolts; the connection between the upper limit block 30 and the upper head 3 adopts an inlaid structure connection, and can also be connected by bolts.

[0048] A heat sealing device in an embodiment of the utility model includes a heat sealing component in any of the above embodiments. Specifically, the heat sealing device may include multiple heat sealing components. In one embodiment, multiple heat sealing components may be arranged in sequence on the heat sealing device, and multiple heat sealing components may be controlled to heat seal multiple soft-pack battery cells simultaneously through synchronous operation, thereby improving the efficiency of heat sealing and productivity.

[0049] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sealing head, comprising a sealing head body, wherein heat sealing blocks are provided at opposite ends of one side of the sealing head body, characterized in that: The surface of the sealing head body used for hot pressing with the aluminum-plastic film of the soft-pack battery cell is set as a first hot pressing surface, and the surface of the heat sealing block used for hot pressing with the aluminum-plastic film of the soft-pack battery cell is set as a second hot pressing surface, the second hot pressing surface includes a short side hot pressing surface and a long side hot pressing surface connected in height, the short side hot pressing surface and the long side hot pressing surface are respectively used for hot pressing with the short side and long side of the aluminum-plastic film of the soft-pack battery cell, and the short side hot pressing surface is flush with the first hot pressing surface; taking the first hot pressing surface as a reference, the long side hot pressing surface is higher than the short side hot pressing surface.

2. The end cap according to claim 1, characterized in that: The height difference between the long side hot pressing surface and the short side hot pressing surface is H, and the relationship satisfied by H is: <H≤0.04mm。 3. The end cap according to claim 1, characterized in that: The side surface of the heat sealing block arranged on the head body is set as a connecting surface, the surface of the heat sealing block facing the other heat sealing block is set as an inner side surface, the inner side surface includes an inclined surface and a flat surface connected by an arc transition, the inclined surface connects the flat surface and the connecting surface, the inclined surface is set at an angle to the connecting surface, the angle between the inclined surface and the connecting surface is an obtuse angle, and the flat surface is perpendicular to the connecting surface.

4. The end cap according to claim 3, characterized in that: When the sealing head heat-seals the soft-pack battery core, the distance between the inclined surface and the R angle of the punching pit of the aluminum-plastic film of the soft-pack battery core is 3.1 to 6.28 mm.

5. The end cap according to claim 3, characterized in that: The included angle between the inclined surface and the connecting surface is set to be an included angle A, and the included angle A is 139-152°.

6. The sealing head according to claim 3, characterized in that: A shear cut is provided in the sealing area where the long side and the short side of the aluminum-plastic film intersect, and the shear cut is used to avoid interference between the long side and the short side when the long side is folded; when the head is heat-sealed to the soft-pack battery cell, the distance between the inclined surface and the edge of the shear cut is 6.11 to 7.58 mm.

7. The sealing head according to claim 1, characterized in that: Except for the edge of the surface of the heat sealing block connected to the sealing head body, the edges of other surfaces of the heat sealing block are all rounded.

8. A heat sealing component, characterized in that: It comprises at least one pair of the head covers according to any one of claims 1 to 7, and each pair of the head covers comprises two of the head covers.

9. The heat sealing assembly according to claim 8, characterized in that: The two heads are respectively an upper head and a lower head. The upper head is provided with high-hardness anti-deformation upper limit blocks at the two opposite ends facing the surface of the lower head, and the lower head is provided with high-hardness anti-deformation lower limit blocks at the two opposite ends facing the surface of the upper head. Each lower limit block corresponds to each upper limit block one by one. When the upper head and the lower head are closed to heat-seal the aluminum-plastic film, each lower limit block is fitted with each upper limit block.

10. A heat sealing device, characterized in that: Includes the heat sealing assembly of claim 9.

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