Pouch battery heat sealing structure and heat sealing device

Abstract

The soft package battery heat sealing structure and heat sealing equipment of the present application relate to the soft package battery processing technical field, and the soft package battery heat sealing structure comprises an upper sealing assembly and a lower sealing assembly, the upper sealing assembly is provided with a first flange, part of the first flange defines a position avoiding groove for accommodating the battery cell on the upper sealing assembly; the lower sealing assembly is provided with a second flange, part of the second flange defines a profiled groove for accommodating the battery cell on the lower sealing assembly; when the upper sealing assembly and the lower sealing assembly are close to each other, the first fusion joint line and the second fusion joint line can be respectively fused out before and after the battery is turned over, the two fusion joint lines intersect or partially overlap, and the receiving cavity with the liquid injection port is heat sealed around the battery cell on the heat fusion shell; in this way, the first heat sealing process can be completed by setting a single heat sealing die, which is conducive to the expansion of the production scale; the production and manufacturing cost is reduced, and the production and processing efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soft-pack battery processing, and more particularly to a soft-pack battery heat sealing structure and heat sealing equipment. Background Art

[0002] Soft-pack batteries offer the advantages of high energy density and long cycle life. With technological advancements and growing demand for various applications, soft-pack batteries have seen significant development or progress in terms of dimensions, process flow, and production formulas. Regarding the development of soft-pack battery dimensions, cylindrical, prismatic, and button-shaped batteries have emerged to accommodate different applications and assembly spaces.

[0003] During the production process of some soft-pack batteries, it is necessary to use hot melting to heat-seal the aluminum-plastic film with the battery cells and reserve an electrolyte injection port. Then, the injection port is heat-sealed and the battery is formed to activate the battery cells.

[0004] For the first heat-sealing step in the above-mentioned production process, the prior art will successively send the batteries to be heat-sealed into two or more heat-sealing molds for heat-sealing processing to respectively complete the heat sealing of the battery's tab end and the side. In this way, the setting of multiple molds will, on the one hand, require additional workstations, which is not conducive to the expansion of production scale, and on the other hand, it will lead to an increase in production costs. Thirdly, the transfer of batteries between the two molds is not conducive to improving processing efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a soft-pack battery heat sealing structure and heat sealing equipment that are conducive to the expansion of production scale, have low production costs and can improve production efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] In a first aspect, the present application provides a soft-pack battery heat-sealing structure for heat-sealing a semi-finished battery, wherein the semi-finished battery comprises two heat-melt shells disposed opposite each other, a battery cell disposed between the two heat-melt shells, and two electrode tabs electrically connected to the battery cell and extending from the edges of the heat-melt shells;

[0008] The soft-pack battery heat sealing structure includes an upper sealing component, a lower sealing component and a heating component, wherein the heating component is respectively arranged on the upper sealing component and / or the lower sealing component, wherein the upper sealing component is provided with a first flange, and a portion of the first flange defines a avoidance groove for accommodating a battery cell on the upper sealing component; the lower sealing component is provided with a second flange, and a portion of the second flange defines a contoured groove for accommodating a battery cell on the lower sealing component;

[0009] The upper sealing assembly and the lower sealing assembly are movable relative to each other, and when approaching each other, the first flange and the second flange jointly clamp the semi-finished battery, so that a first welding line intersecting with one of the tabs is welded on the semi-finished battery with the front side facing the upper sealing assembly, or a second welding line intersecting with the other tab is welded on the semi-finished battery with the back side facing the upper sealing assembly;

[0010] The first welding lines and the second welding lines intersect or partially overlap on the semi-finished battery, thereby welding a receiving cavity having a liquid injection port and in which the battery cell is arranged on the semi-finished battery.

[0011] In some embodiments, a line connecting the center of the contoured groove and the center of the battery cell placed in the contoured groove is parallel to the Z axis;

[0012] The second flange includes a second middle sealing edge surrounding the contoured groove on the lower sealing assembly, a second heat sealing edge connected to one end of the second middle sealing edge, and a second welding edge connected to the other end of the second middle sealing edge;

[0013] The two ends of the second edge seal are respectively connected to the center of the profiling groove and together with the groove wall of the profiling groove, form a pie-shaped area or a rectangular area;

[0014] The center of the projection surface of the pie-shaped area or the rectangular area in the Z-axis direction after being flipped in the flipping direction of the semi-finished battery can overlap with the center of the projection surface of the pie-shaped area or the rectangular area in the Z-axis direction and together form a pie or rectangle with a notch.

[0015] In some embodiments, the first weld line includes a first oblique seal, and the second weld line includes a second oblique seal;

[0016] The second heat-sealed edge can be welded together with the first flange to form the first oblique seal mark on the semi-finished battery with its front side facing the upper sealing assembly, and can also be welded to form the second oblique seal mark on the semi-finished battery with its back side facing the upper sealing assembly;

[0017] The first oblique sealing mark and the second oblique sealing mark do not intersect each other.

[0018] In some embodiments, the lower sealing assembly is further provided with an avoidance step, and a portion of the side wall of the avoidance step is recessed inward to form the contoured groove.

[0019] In some embodiments, the second flange includes a first middle sealing edge defining the avoidance groove on the upper sealing component, a first heat sealing edge connected to one end of the first middle sealing edge, and a first welding edge connected to the other end of the first middle sealing edge;

[0020] The first middle sealed edge is used to abut against the second middle sealed edge, the first heat-sealed edge is used to abut against the second heat-sealed edge, and the first welded edge is used to abut against the second welded edge.

[0021] In some embodiments, the lower sealing assembly includes a lower sealing head with a positioning step, and a silicone plate with a bottom adapted to the positioning step;

[0022] The silicone plate is arranged on the lower head, and the second flange is located on the silicone plate.

[0023] In some embodiments, two fixing members are provided on the silicone plate, and the two fixing members are respectively connected to the lower sealing assembly.

[0024] In some embodiments, the lower sealing assembly further comprises an alignment assembly, wherein the alignment assembly comprises a guide post and a guide hole adapted to an outer diameter of the guide post;

[0025] One of the guide post and the guide hole is provided on the upper sealing component, and the other of the guide post and the guide hole is provided on the lower sealing component. The guide post can be correspondingly inserted into the guide hole.

[0026] In some embodiments, the upper sealing assembly includes a base and an upper sealing head disposed on the base; the first flange is located on the upper sealing head;

[0027] The heating component includes an upper heating tube arranged on the base and / or a lower heating tube arranged on the lower sealing component.

[0028] In a second aspect, the present invention further provides a heat sealing device, which includes a driving mechanism and the soft-pack battery heat sealing structure described in any one of the above technical solutions, wherein the soft-pack battery heat sealing structure is driven and connected to the driving mechanism.

[0029] The charging stand of the present invention has at least the following beneficial effects:

[0030] The soft-pack battery heat-sealing structure and heat-sealing equipment of the present invention provide a first flange on the upper sealing component and make a part of the first flange define a avoidance groove, and provide a second flange on the lower sealing component and make a part of the second flange define a contoured groove; so that when the upper sealing component and the lower sealing component are close to each other, the first welding line and the second welding line can be heat-melted on the battery before and after flipping, respectively, and the two welding lines intersect or partially overlap, and a storage cavity with a liquid injection port is heat-sealed around the battery cell on the hot-melt shell; in this way, a single heat-sealing mold can be provided to complete the first heat-sealing process, which is conducive to the expansion of production scale; while reducing production and manufacturing costs, it can also effectively improve production and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The application will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0032] Figure 1 is a structural schematic diagram of a soft-pack battery heat-sealing structure in one preferred embodiment of the application;

[0033] Figure 2 is a structural schematic diagram of a lower sealing assembly in another preferred embodiment of the application;

[0034] Figure 3 is a structural schematic diagram of the soft-pack battery heat-sealing structure shown in the figure from another angle; Figure 1

[0035] Figure 4 is a structural schematic diagram of the lower sealing assembly in the figure from another angle;

[0036] Figure 5 is a structural schematic diagram of a semi-finished soft-pack battery having a first fusion line and a second fusion line fused thereon;

[0037] Figure 6 is a schematic diagram of the projection of the cake-shaped area before and after turning over in the Z-axis direction. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, objectives and effects of the application, the specific embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0039] Figure 1 、 Figure 2 、 Figure 3 and Figure 4 show a soft-pack battery heat-sealing structure in some preferred embodiments of the application, which is used to heat seal a semi-finished battery 20 so that fusion lines are heat-fused on the semi-finished battery 20 according to predetermined tracks. As shown in Figure 4 and Figure 5 , the semi-finished battery 20 includes two heat-fused housings 20a arranged oppositely, a battery core 20b arranged between the two heat-fused housings 20a, and two pole tabs 20c extending out of the edges of the heat-fused housings 20a and electrically connected to the battery core 20b. It can be understood that the two heat-fused housings 20a can be made of existing aluminum-plastic film materials, and a groove for accommodating the battery core 20b can be processed on the heat-fused housings 20a; one end of the pole tab 20c is connected to the battery core 20b, and the other end of the pole tab 20c is exposed outside the two heat-fused housings 20a.

[0040] As shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 ​As shown, the soft-pack battery heat-sealing structure 10 includes an upper sealing component 1, a lower sealing component 2, and a heating component 3. The heating component 3 is respectively arranged on the upper sealing component 1 and / or the lower sealing component 2. Among them, the upper sealing component 1 and the lower sealing component 2 are used to clamp the battery from both sides. The heating component 3 is used to generate heat, thereby heating the upper sealing component 1 or the lower sealing component 2 separately; of course, the heating component 3 can also be set on the upper sealing component 1 and the lower sealing component 2 at the same time, thereby heating the upper sealing component 1 and the lower sealing component 2 at the same time; the upper sealing component 1 and the lower sealing component 2 with increased heat can heat the battery's hot-melt shell 20a to form a weld line when clamping the battery.

[0041] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the upper sealing assembly 1 is provided with a first flange 111, and a portion of the first flange 111 defines a avoidance groove 112 on the upper sealing assembly 1 for accommodating the battery cell 20b. The first flange 111 is used to abut the hot melt shell 20a of the battery, and the avoidance groove 112 serves to prevent the hot melt shell 20a from contacting the upper sealing assembly 1. The lower sealing assembly 2 is provided with a second flange 211, and a portion of the second flange 211 defines a contoured groove 212 on the lower sealing assembly 2 for accommodating the battery cell 20b. The second flange 211 is used to abut the other side of the hot melt shell 20a, and the contoured groove 212 also serves to prevent the battery cell 20b from contacting the lower sealing assembly 2.

[0042] It can be understood that the groove wall contours of the avoidance groove 112 and the contoured groove 212 are slightly larger than the size specifications of the semi-finished battery 20, etc., which can avoid accidental welding or crushing of the battery cell 20b on the part of the hot melt shell where the battery cell 20b is provided.

[0043] See also Figure 5 and Figure 6 The upper sealing assembly 1 and the lower sealing assembly 2 are movable relative to each other, and when they approach each other, the first flange 111 and the second flange 211 jointly clamp the semi-finished battery 20, so that a first weld line 20e intersecting one of the tabs 20c is welded on the semi-finished battery 20 with its front side facing the upper sealing assembly 1, and a second weld line 20f intersecting the other tab 20c is welded on the semi-finished battery 20 with its back side facing the upper sealing assembly 1. The first weld line and the second weld line intersect or partially overlap on the semi-finished battery 20, thereby welding a receiving cavity having a liquid injection port 20d and a battery cell disposed therein on the semi-finished battery 20.

[0044] It can be understood that the parts corresponding to the first welding line 20e and the second welding line 20f on the hot-melt shell 20a will be welded to each other to form a storage cavity around the battery cell 20b, and the first welding line 20e and the second welding line 20f will not form a closed ring on the hot-melt shell 20a, so that the welded storage cavity can have an injection port 20d for injecting the liquid medicine.

[0045] During actual use, the semi-finished battery 20 is placed on the lower sealing assembly 2 or the upper sealing assembly 1, so that the battery cell 20b on the semi-finished battery 20 falls into the contoured groove 212 or the avoidance groove 112, and one side of the semi-finished battery 20 faces the upper sealing assembly 1. The upper sealing assembly 1 and the lower sealing assembly 2 drive the first flange 111 and the second flange 211 to approach each other, so that the first flange 111 and the second flange 211 respectively clamp the hot melt shell 20a from both sides of the battery. Heat is transferred to the hot melt shell 20a through the first flange 111 and the second flange 211, so that the hot melt shell 20a forms a first weld line 20e along the trajectory of the flange.

[0046] Subsequently, the battery that has been hot-melted and processed with the first welding line 20e is turned over so that the other side of the battery faces the upper sealing component 1, and the first flange 111 and the second flange 211 that are close to each other along a predetermined trajectory respectively clamp the hot-melt shell 20a from both sides of the battery, thereby forming a second welding line 20f on the hot-melt shell 20a along the trajectory of the flange.

[0047] It is also understood that the relative movement of the upper and lower sealing assemblies 1 and 2 can be driven by an external mechanism or device capable of providing a driving force; for example, this can be driven by a hydraulic cylinder, an air cylinder, a motor, or other device or mechanism. The width of the first flange 111 and the width of the second flange 211 can be flexibly set, depending on the desired thickness of the hot melt pattern.

[0048] In addition, the height of the first flange 111 and the second flange 211 is adjusted according to the thickness of the hot-melt shell 20a. During the hot pressing process, it is necessary to prevent the upper sealing component 1 and the lower sealing component 2 from accidentally welding or crushing the battery cell 20b at places other than the first welding line 20e and the second welding line 20f.

[0049] like Figure 1 and Figure 4As shown, in some embodiments of the heat-sealing structure of the soft-pack battery, the line connecting the center of the contoured groove 212 and the center of the battery cell 20b placed in the contoured groove 212 is parallel to the Z-axis; after the battery is correctly placed on the lower sealing component 2, the center of the battery cell 20b and the center of the contoured groove 212 are located on the same Z-axis, wherein the Z-axis direction is the direction in which the upper sealing component 1 and the lower sealing component 2 approach each other, that is, the upper sealing component 1 and the lower sealing component 2 can approach each other along the Z-axis direction to complete the welding of the hot-melt shell 20a.

[0050] like Figure 1 、 Figure 2 and Figure 4 As shown, the second flange 211 includes a second middle sealing edge 2111 that forms a contoured groove 212 on the lower sealing component 2, a second heat-sealing edge 2112 connected to one end of the second middle sealing edge 2111, and a second welding edge 2113 connected to the other end of the second middle sealing edge 2111; the second middle sealing edge 2111, the second heat-sealing edge 2112 and the second welding edge 2113 are jointly used to abut against the hot-melt shell 20a to heat-seal the hot-melt shell 20a along a predetermined trajectory.

[0051] It can be understood that the shapes and trajectories of the second middle sealing edge 2111, the second heat sealing edge 2112 and the second welding edge 2113 can be flexibly set, among which the second middle sealing edge 2111 is mainly used to hot-seal the part of the battery cell 20b where the battery cell 20b is provided.

[0052] like Figures 1 to 5 As shown, the two ends of the second middle sealing edge 2111 are respectively connected to the center of the profiling groove 212 and together with the groove wall of the profiling groove 212, they enclose a pie-shaped area 5 or a rectangular area; after the pie-shaped area 5 or the rectangular area is flipped in the flipping direction of the semi-finished battery 20, the center of the projection surface in the Z-axis direction can overlap with the center of the projection surface in the Z-axis direction of the pie-shaped area or the rectangular area and together form a pie 30a or rectangle with a notch 30b.

[0053] It can be understood that the pancake-shaped area 5 is used for hot-melt sealing batteries with a circular cell area, such as button-type batteries; while the rectangular area is used for hot-melt sealing batteries with a rectangular cell area, such as square batteries. Specifically, the contoured groove 212 formed by the second middle seal 2111 directly contacts the portion of the battery cell that needs to be hot-melt sealed, and hot-melt seals the contacted portion. After the battery is flipped and repositioned in the hot-melt sealing position, the second middle seal 2111 will heat-seal around the cell area from the other side of the battery. The two heat-seal trajectories partially overlap or intersect, forming a pancake shape with a notch in the center of the battery cell 20b. Heat-sealing is then performed around the outer edge of the pancake shape or rectangle, while the notch is not heat-sealed, thus forming the liquid injection port 20d.

[0054] Understandably, Figure 6 The projection area of ​​the middle pancake-shaped area 5 in the Z-axis direction is 30c. Figure 6 The projection surface of the middle pancake-shaped area 5 in the Z-axis direction after flipping is 30d. The center of the projection surface 30c and the center of the projection surface 30d overlap each other to form Figure 6 The pie shape 30a shown in FIG has a notch 30b, and the edge of the notch 30b is not heat-sealed, forming a pie shape 30a. Figure 5 In addition, to ensure that the liquid medicine can be smoothly injected into the heat-sealed storage cavity through the liquid injection port 20d, the trajectories of the second heat-sealed edges 2112 on the two opposite sides of the battery cannot intersect, ensuring that the liquid injection port 20d is open for liquid medicine injection.

[0055] Furthermore, it should be noted that if the center of projection surface 30c and the center of projection surface 30d overlap, the resulting pancake shape 30a has two gaps, indicating that the final hot-melt sealed storage cavity, in addition to the liquid injection port 20d, has an extra location that is not sealed, resulting in leakage. If the center of projection surface 30c and the center of projection surface 30d overlap, the resulting pancake shape 30a has no gaps, that is, if the overlap forms a complete circle, then the final hot-melt sealed storage cavity does not have a liquid injection port 20d for injecting liquid.

[0056] Similarly, for soft-pack batteries such as square batteries whose cell arrangement is approximately rectangular, the directions of the first flange 111 and the second flange 211 can be adjusted so that the projection area of ​​the avoidance groove 112 and the contoured groove 212 on the Z axis becomes a rectangular with a notch.

[0057] like Figure 4 and Figure 5 As shown, further, in some embodiments of the heat-sealed structure of the soft-pack battery, the first weld line 20e includes a first oblique seal 21e, and the second weld line 20f includes a second oblique seal 21f;

[0058] The second heat-sealed edge 2112 can be welded together with the first flange 111 to form a first oblique seal 21e on the semi-finished battery 20 with the front side facing the upper sealing component 1, and can also be welded to form a second oblique seal 21f on the semi-finished battery 20 with the back side facing the upper sealing component 1; the first oblique seal 21e and the second oblique seal 21f do not intersect with each other.

[0059] It can be understood that the first welding line 20e and the second welding line 20f are respectively formed by the first flange 111 and the second flange 211 being heat-sealed on the opposite side surfaces of the battery in succession, and the second heat-sealed edge 2112 and the first flange 111 jointly clamp the hot-melt shell 20a of the battery, thereby forming the first oblique seal mark 21e and the second oblique seal mark 21f on the battery before and after flipping, respectively; avoiding the intersection of the first oblique seal mark 21e and the second oblique seal mark 21f can ensure that the liquid filling port 20d can be directly opened and connected to the outside of the battery. If the two intersect, although the liquid filling port 20d will also be formed, the liquid filling port 20d is not directly connected to the outside of the battery, and its interior is a fully enclosed cavity that cannot be used for subsequent liquid filling requirements.

[0060] Preferably, if Figure 5 As shown, in some embodiments, the distance between the first oblique sealing mark 21e and the second oblique sealing mark 21f gradually increases in the direction away from the liquid injection port 20d.

[0061] In this way, the gradually increasing distance can prevent the hot melt shell 20a between the first oblique seal 21e and the second oblique seal 21f from being welded to a certain extent due to heat radiation, thereby avoiding the formation of a seal between the first oblique seal 21e and the second oblique seal 21f.

[0062] like Figures 1 to 4 As shown, in some embodiments, the lower sealing assembly 2 may further be provided with an avoidance step 213 , and a portion of the sidewall of the avoidance step 213 is recessed inward to form a contoured groove 212 .

[0063] It can be understood that the avoidance step 213 is used to accommodate the part of the battery that does not need to be hot-melt packaged, so that the height of the second flange 211 can be reduced, that is, there is no need to increase the height of the second flange 211 to increase the distance between the lower sealing component 2 and the battery being heat-sealed, and heat can also be avoided from causing welding to the parts outside the predetermined heat-sealing trajectory.

[0064] Accordingly, the second flange 211 can be directly integrally formed and arranged on the lower sealing assembly 2, or can be separately assembled to the lower sealing assembly 2. The second flange 211 always has a certain protrusion relative to the upper surface of the lower sealing assembly 2 to prevent the tabs on the battery from being crushed by the upper sealing assembly 1 and the lower sealing assembly 2;

[0065] like Figure 2 and Figure 4 The second flange 211 shown in some embodiments may include a first middle sealing edge 1111 defining a relief groove 112 on the upper sealing assembly 1, a first heat sealing edge 1112 connected to one end of the first middle sealing edge 1111, and a first welding edge 1113 connected to the other end of the first middle sealing edge 1111;

[0066] The first middle sealing edge 1111 is used to abut against the second middle sealing edge 2111 , the first heat-sealed edge 1112 is used to abut against the second heat-sealed edge 2112 , and the first welded edge 1113 is used to abut against the second welded edge 2113 .

[0067] It can be understood that when the hot-melt shell 20a of the battery is hot-melt packaged, the first middle sealing edge 1111 will clamp the same part of the hot-melt shell 20a with the second middle sealing edge 2111, the first heat-sealed edge 1112 will correspond to the second heat-sealed edge 2112, and the first welding edge 1113 will correspond to the second welding edge 2113.

[0068] like Figures 1 to 4 As shown, in some embodiments, the lower sealing assembly 2 may include a lower sealing head 21 having a positioning step 214, and a silicone plate 22 whose bottom is adapted to the positioning step 214; the silicone plate 22 is disposed on the lower sealing head 21, and the second flange 211 is located on the silicone plate 22. The lower sealing head 21 may be provided with a structure for fixing the heating assembly 3.

[0069] It can be understood that the bottom of the silicone plate 22 is provided with a step structure that is compatible with the surface contour of the positioning step 214. The cooperation between the two can prevent the silicone plate 22 from being displaced; this also ensures the relative position between the second flange 211 provided on the silicone plate 22 and the lower head 21, ensuring that the second flange 211 and the first flange 111 can accurately clamp the predetermined position on the hot melt shell 20a.

[0070] like Figure 1 、 Figure 2 and Figure 4 As shown, in some embodiments, the silicone plate 22 may be provided with two fixing members 23 , and the two fixing members 23 are respectively connected to the lower sealing assembly 2 .

[0071] It is understandable that the fixing member 23 can be set on the lower head 21 by means of a screw or other structure, or can be set on the lower head 21 by means of a magnetic attraction, a snap or other fixing structure.

[0072] like Figure 1 、 Figure 3 and Figure 4 As shown, in some embodiments, the lower sealing assembly 2 further includes an alignment assembly 4 , which serves to guide the upper sealing assembly 1 and the lower sealing assembly 2 to be accurately aligned.

[0073] The alignment component 4 includes a guide column 41 and a guide hole 42 adapted to the outer diameter of the guide column 41; one of the guide column 41 and the guide hole 42 is set on the upper sealing component 1, and the other of the guide column 41 and the guide hole 42 is set on the lower sealing component 2, and the guide column 41 can be inserted into the guide hole 42 accordingly.

[0074] It can be understood that the guide hole 42 will be pre-inserted into the guide hole 42 when the upper sealing component 1 and the lower sealing component 2 are approaching each other, guiding the upper sealing component 1 and the lower sealing component 2 to be accurately aligned, avoiding misalignment of the first flange 111 and the second flange 211, improving the molding accuracy of the first weld line 20e and the second weld line 20f, and improving the heat sealing processing accuracy.

[0075] like Figure 1 and Figure 3 As shown, in some embodiments, the upper sealing assembly 1 may include a base 12 and an upper sealing head 11 disposed on the base 12; a first flange 111 is located on the upper sealing head 11. The heating assembly 3 includes an upper heating pipe 31 disposed on the base 12 and / or a lower heating pipe 32 disposed on the lower sealing assembly 2. The upper sealing head 11 can be secured to the base 12 using screws or other fasteners, preferably countersunk screws, to ensure the overall smoothness of the outer contour of the upper sealing assembly 1.

[0076] It can be understood that the upper heating tube 31 can be set only on the base 12 to heat only the first flange 111; the lower heating tube 32 can be set only on the lower sealing component 2 to heat only the second flange 211; of course, the upper heating tube 31 and the lower heating tube 32 can also be set at the same time to heat the first flange 111 and the second flange 211 at the same time.

[0077] In some preferred embodiments of the present invention, the heat-sealing device is used to heat-seal a hot-melt outer shell on a battery. The device may include a drive mechanism and the soft-pack battery heat-sealing structure 10 described in any of the above-described embodiments. The soft-pack battery heat-sealing structure 10 is drivably connected to the drive mechanism. The drive mechanism is used to drive the relative movement of the upper sealing assembly 1 and the lower sealing assembly 2.

[0078] It can be understood that the driving mechanism can be a cylinder, an oil cylinder, a motor or other device that can provide power to drive the upper sealing component 1 and the lower sealing component 2 to move relative to each other along a predetermined trajectory, so that the first flange 111 and the second flange 211 jointly clamp the hot melt shell 20a of the battery to achieve the purpose of heat sealing.

[0079] The soft-pack battery heat-sealing structure and heat-sealing equipment of the present invention provide a first flange on the upper sealing component and make a part of the first flange define a avoidance groove, and provide a second flange on the lower sealing component and make a part of the second flange define a contoured groove; so that when the upper sealing component and the lower sealing component are close to each other, the first welding line and the second welding line can be heat-melted on the battery before and after flipping, respectively, and the two welding lines intersect or partially overlap, and a storage cavity with a liquid injection port is heat-sealed around the battery cell on the hot-melt shell; in this way, a single heat-sealing mold can be provided to complete the first heat-sealing process, which is conducive to the expansion of production scale; while reducing production and manufacturing costs, it can also effectively improve production and processing efficiency.

[0080] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent variations and modifications within the scope of the claims of the present invention are intended to be covered by the claims of the present invention.

Claims

1. A soft-pack battery heat-sealing structure for heat-sealing a semi-finished battery (20), the semi-finished battery (20) comprising two heat-melt shells (20a) arranged opposite to each other, a battery cell (20b) arranged between the two heat-melt shells (20a), and two electrode tabs (20c) electrically connected to the battery cell (20b) and extending from the edges of the heat-melt shells (20a); The soft pack battery heat sealing structure (10) comprises an upper sealing component (1), a lower sealing component (2) and a heating component (3), wherein the heating component (3) is respectively arranged on the upper sealing component (1) and / or the lower sealing component (2), and is characterized in that: The upper sealing component (1) is provided with a first flange (111), and a portion of the first flange (111) defines a relief groove (112) on the upper sealing component (1) for accommodating a battery cell (20b); the lower sealing component (2) is provided with a second flange (211), and a portion of the second flange (211) defines a contoured groove (212) on the lower sealing component (2) for accommodating a battery cell (20b); The upper sealing component (1) and the lower sealing component (2) can move relative to each other, and when approaching each other, the first flange (111) and the second flange (211) can jointly clamp the semi-finished battery (20), so that a first welding line (20e) intersecting with one of the tabs (20c) is welded on the semi-finished battery (20) with the front side facing the upper sealing component (1), or a second welding line (20f) intersecting with the other tab (20c) is welded on the semi-finished battery (20) with the back side facing the upper sealing component (1); The first welding lines and the second welding lines intersect or partially overlap on the semi-finished battery (20), thereby welding a receiving cavity having a liquid injection port (20d) and in which the battery cell is arranged on the semi-finished battery (20); A line connecting the center of the contoured groove (212) and the center of the battery cell (20b) placed in the contoured groove (212) is parallel to the Z axis; The second flange (211) comprises a second middle sealing edge (2111) surrounding the contoured groove (212) on the lower sealing component (2), a second heat sealing edge (2112) connected to one end of the second middle sealing edge (2111), and a second welding edge (2113) connected to the other end of the second middle sealing edge (2111); The two ends of the second middle edge seal (2111) are respectively connected to the center of the profiling groove (212) and together with the groove wall of the profiling groove (212) form a pie-shaped area or a rectangular area; The center of the projection surface of the pie-shaped area or the rectangular area in the Z-axis direction after the semi-finished battery (20) is flipped in the flipping direction can overlap with the center of the projection surface of the pie-shaped area or the rectangular area in the Z-axis direction and together form a pie or rectangle with a notch; The first weld pattern includes a first oblique seal, and the second weld pattern includes a second oblique seal; The second heat-sealed edge (2112) can be welded together with the first flange (111) to form the first oblique seal mark on the semi-finished battery (20) with the front side facing the upper sealing component (1), and can also be welded to form the second oblique seal mark on the semi-finished battery (20) with the back side facing the upper sealing component (1); The first oblique sealing mark and the second oblique sealing mark do not intersect each other; The second flange (211) includes a first middle sealing edge (1111) defining the avoidance groove (112) on the upper sealing component (1), a first heat sealing edge (1112) connected to one end of the first middle sealing edge (1111), and a first welding edge (1113) connected to the other end of the first middle sealing edge (1111); The first middle sealing edge (1111) is used to abut against the second middle sealing edge (2111), the first heat sealing edge (1112) is used to abut against the second heat sealing edge (2112), and the first welding edge (1113) is used to abut against the second welding edge (2113).

2. The soft pack battery heat sealing structure according to claim 1, characterized in that: The lower sealing component (2) is also provided with an avoidance step (213), and part of the side wall of the avoidance step (213) is recessed inwards to form the contoured groove (212).

3. The heat-sealing structure of the soft-pack battery according to claim 1, characterized in that: The lower sealing assembly (2) comprises a lower sealing head (21) provided with a positioning step (214), and a silicone plate (22) with a bottom adapted to the positioning step (214); The silica gel plate (22) is arranged on the lower head (21), and the second flange (211) is located on the silica gel plate (22).

4. The soft pack battery heat sealing structure according to claim 3, characterized in that: Two fixing members (23) are provided on the silica gel plate (22), and the two fixing members (23) are respectively connected to the lower sealing assembly (2).

5. The soft pack battery heat sealing structure according to claim 1, characterized in that: The lower sealing assembly (2) further includes a positioning assembly (4), and the positioning assembly (4) includes a guide column (41) and a guide hole (42) adapted to the outer diameter of the guide column (41); One of the guide column (41) and the guide hole (42) is arranged on the upper sealing component (1), and the other of the guide column (41) and the guide hole (42) is arranged on the lower sealing component (2), and the guide column (41) can be correspondingly inserted into the guide hole (42).

6. The heat-sealing structure of the soft-pack battery according to claim 1, characterized in that: The upper sealing assembly (1) comprises a base (12) and an upper sealing head (11) arranged on the base (12); the first flange (111) is located on the upper sealing head (11); The heating component (3) comprises an upper heating tube (31) arranged on the base (12) and / or a lower heating tube (32) arranged on the lower sealing component (2).

7. A heat sealing device, characterized in that: It comprises a driving mechanism and the soft-pack battery heat-sealing structure (10) according to any one of claims 1 to 6, wherein the soft-pack battery heat-sealing structure (10) is drivingly connected to the driving mechanism.

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