Battery pack and glue injection nozzle

Abstract

The battery pack comprises a box body, a battery module and a buffer structure, the box body comprises a cross beam extending in the first direction, the battery module is arranged in the box body, the cross beam is located on at least one side of the battery module in the second direction, and an assembly gap is formed between the battery module and the cross beam. The buffer structure is filled in the assembly gap and comprises a flexible packaging bag and a foaming material, the flexible packaging bag is contained in the assembly gap, and the foaming material is filled in the flexible packaging bag. According to the battery pack disclosed by the embodiment of the utility model, the buffer structure is filled in the assembly gap formed between the battery module and the cross beam, so that the problems of cycle life attenuation and overall thermal insulation performance reduction of the battery cells at the end parts of the battery module due to the assembly gap can be solved; the cycle performance of the battery pack can be improved, and a certain heat preservation and insulation effect on the battery module is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and a glue injection nozzle. Background Art

[0002] In the related art, when the battery module is produced and put into the box, there must be a certain assembly gap between the end of the battery module and the crossbeam in the box to ensure that there is no friction and collision during the boxing process. The existence of this assembly gap will affect the cycle expansion stress retention and thermal insulation performance of the end cells of the battery module. Therefore, the above problems need to be solved. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack, which can solve the problem of cycle life attenuation and overall thermal insulation performance reduction of the end cells of the battery module due to the above-mentioned assembly gap by filling a buffer structure in the assembly gap formed between the battery module and the crossbeam, and can improve the cycle performance of the battery pack and have a certain thermal insulation effect on the battery module.

[0004] The utility model also provides a glue injection nozzle for the battery pack.

[0005] A battery pack according to an embodiment of the first aspect of the utility model includes: a box body, the box body includes a crossbeam extending along a first direction; a battery module, the battery module is arranged in the box body, the crossbeam is located on at least one side of the battery module along a second direction, the second direction is perpendicular to the first direction, and an assembly gap is provided between the battery module and the crossbeam; a buffer structure, the buffer structure is filled in the assembly gap and includes a flexible packaging bag and a foaming material, the flexible packaging bag is accommodated in the assembly gap, and the foaming material is filled in the flexible packaging bag.

[0006] According to the battery pack of the embodiment of the utility model, by filling the buffer structure in the assembly gap formed between the battery module and the crossbeam, the problem of cycle life attenuation and overall thermal insulation performance reduction of the end cells of the battery module due to the above-mentioned assembly gap can be solved, the cycle performance of the battery pack can be improved and a certain thermal insulation effect on the battery module can be achieved; and, by the buffer structure including a flexible packaging bag and a foaming material filled in the flexible packaging bag, the fluidity of the foaming material before curing can be utilized, so that the foaming material can fully fill the assembly gap formed between the battery module and the crossbeam, so that the cycle stress of the end cells of the battery module is more uniform, thereby better improving the cycle performance of the battery pack.

[0007] According to some embodiments of the present invention, the flexible packaging bag is made of polyester material.

[0008] According to some embodiments of the present invention, the top of the flexible packaging bag is open to form a material inlet, and the foaming material is used to enter the flexible packaging bag through the material inlet.

[0009] According to some embodiments of the present invention, the flexible packaging bag includes a bag body and a sealed edge, the sealed edge is connected to the outer edge of the bag body, the top of the bag body is open to form the material inlet, and the width of the sealed edge is not less than 5 mm.

[0010] According to some embodiments of the present invention, the upper end of the flexible packaging bag is formed as a sealing end, the sealing end defines the material inlet, the sealing end is provided with a double-sided adhesive layer, and the sealing end is bonded to the double-sided adhesive layer to seal the material inlet.

[0011] According to some embodiments of the utility model, the sealing end includes a first packaging wall and a second packaging wall arranged opposite to each other along the second direction, the double-sided adhesive layer includes a first double-sided adhesive layer and a second double-sided adhesive layer, the wall surface of the first packaging wall facing the material inlet is provided with the first double-sided adhesive layer, the wall surface of the second packaging wall facing away from the material inlet is provided with the second double-sided adhesive layer, a folding mark is formed on the bottom edge of the second packaging wall, the wall surface of the second packaging wall facing the material inlet is bonded to the first double-sided adhesive layer, and the second double-sided adhesive layer is bonded to the outer wall surface of the flexible packaging bag.

[0012] According to some embodiments of the present invention, the battery module includes a plurality of battery cells arranged along the second direction, the battery cells are blade batteries, the thickness direction of the battery cells is consistent with the second direction, the length direction of the battery cells extends along the first direction, and the assembly gap extends along the first direction.

[0013] According to the glue injection nozzle of the second aspect embodiment of the utility model, the glue injection nozzle is used for the battery pack according to the first aspect embodiment of the utility model, and is suitable for injecting foaming material into the flexible packaging bag through the glue injection nozzle, and the glue injection nozzle comprises: a funnel portion, the funnel portion having a glue injection cavity and a glue injection port connected to the glue injection cavity; a glue discharge portion, the glue discharge portion is connected to the side of the funnel portion away from the glue injection port, the glue discharge portion has a material discharge cavity and a glue discharge port connected to the material discharge cavity, the material discharge cavity is connected to the glue injection cavity, and the glue discharge port is located on the side of the material discharge cavity away from the glue injection cavity, and in the process of injecting foaming material into the flexible packaging bag, the glue discharge portion is located below the funnel portion and inside the flexible packaging bag; wherein the cross-sectional area of ​​the glue injection cavity gradually increases in the direction from the glue discharge portion to the funnel portion.

[0014] According to the glue injection nozzle of the second aspect embodiment of the utility model, the glue injection nozzle is used for the battery pack according to the first aspect embodiment of the utility model. During the production and manufacturing process of the battery pack, the liquid foaming material can be conveniently injected into the flexible packaging bag through the glue injection nozzle; and, by configuring the glue injection nozzle to include the above-mentioned funnel portion and the glue outlet portion, the configuration of the funnel portion facilitates the injection of liquid foaming material into the glue injection nozzle, and the configuration of the glue outlet portion facilitates the extension of part of the glue injection nozzle into the flexible packaging bag, so as to ensure that the foaming material passing through the glue injection nozzle can smoothly enter the flexible packaging bag, thereby improving the convenience and efficiency of injecting the foaming material into the flexible packaging bag.

[0015] According to some embodiments of the utility model, the funnel portion includes a first side wall and a second side wall arranged opposite to each other along the second direction, the distance between the first side wall and the second side wall gradually increases in the direction from the glue outlet portion to the funnel portion, the first side wall extends in a vertical direction, and the second side wall extends obliquely in the direction from the glue outlet portion to the funnel portion toward a direction away from the first side wall.

[0016] According to some embodiments of the present utility model, the cross section of the material discharge cavity is in the shape of a letter "I", the glue outlet is in the shape of a letter "I", and the glue outlet portion is in the shape of an inverted trapezoid.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a partial structural schematic diagram of a battery pack according to some embodiments of the utility model, wherein the cooperation between the glue injection nozzle and the flexible packaging bag is shown;

[0020] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 yes Figure 1 A schematic diagram of a flexible packaging bag for a battery pack;

[0022] Figure 4 is a schematic diagram of a glue injection nozzle according to some embodiments of the utility model;

[0023] Figure 5 yes Figure 4 Schematic diagram of the glue injection nozzle from another angle.

[0024] Reference numerals:

[0025] 100. Battery pack;

[0026] 10. Box body; 11. Crossbeam; 12. Assembly gap;

[0027] 20. Battery module; 21. Battery cell;

[0028] 30. Buffer structure;

[0029] 31. flexible packaging bag; 311. bag body; 312. edge sealing; 313. sealing end; 314. material inlet; 315. first packaging wall; 316. second packaging wall; 317. folding edge mark;

[0030] 41. a first double-sided adhesive layer; 42. a second double-sided adhesive layer;

[0031] 50. Glue injection nozzle; 51. Funnel portion; 511. Glue injection cavity; 512. Glue injection port; 513. First side wall; 514. Second side wall; 52. Glue discharge portion; 521. Discharge cavity; 522. Glue discharge port. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] Reference below Figure 1-Figure 3 A battery pack 100 according to an embodiment of the present invention is described.

[0034] The battery pack 100 according to the first embodiment of the utility model comprises: a box body 10, a battery module 20 and a buffer structure 30. The box body 10 comprises a first direction (refer to Figure 1 The battery module 20 is arranged in the box body 10, and the beam 11 is located at the battery module 20 along the second direction (refer to Figure 1 The second direction is perpendicular to the first direction, for example, the beam 11 is located on one side of the battery module 20 along the second direction, or the beam 11 is located on two opposite sides of the battery module 20 along the second direction.

[0035] For example, the battery module 20 may include a plurality of battery cells 21 arranged along the second direction, the battery cells 21 are blade batteries, the thickness direction of the battery cells 21 is consistent with the second direction, the length direction of the battery cells 21 extends along the first direction, and the assembly gap 12 extends along the first direction.

[0036] Among them, there is an assembly gap 12 between the battery module 20 and the beam 11, the buffer structure 30 is filled in the assembly gap 12, and the buffer structure 30 includes a flexible packaging bag 31 and a foaming material, the flexible packaging bag 31 is accommodated in the assembly gap 12, and the foaming material is filled in the flexible packaging bag 31.

[0037] During the assembly process of the battery pack 100, the battery module 20 is assembled into the box body 10 and close to the crossbeam 11. At this time, there is the above-mentioned assembly gap 12 between the battery module 20 and the crossbeam 11, and then the buffer structure 30 is filled in the assembly gap 12. By filling the buffer structure 30 in the assembly gap 12 formed between the battery module 20 and the crossbeam 11, the problem of cycle life attenuation and overall thermal insulation performance reduction of the end cells of the battery module 20 caused by the above-mentioned assembly gap 12 can be solved, and the cycle performance of the battery pack 100 can be improved, and a certain thermal insulation effect can be provided to the battery module 20.

[0038] The process of filling the buffer structure 30 into the assembly gap 12 formed between the battery module 20 and the crossbeam 11 can be as follows: accommodate the flexible packaging bag 31 of the buffer structure 30 into the above-mentioned assembly gap 12, inject liquid foaming material into the flexible packaging bag 31, and after the injection of the foaming material is completed, wait for the foaming material in the flexible packaging bag 31 to foam and solidify, thereby filling the assembly gap 12. By including the flexible packaging bag 31 and the foaming material filled in the flexible packaging bag 31 in the buffer structure 30, the fluidity of the foaming material before solidification can be used to make the foaming material fully fill the assembly gap 12 formed between the battery module 20 and the crossbeam 11, so that the cycle stress of the end cells of the battery module 20 is more uniform, and the cycle performance of the battery pack 100 is better improved.

[0039] According to the battery pack 100 of the embodiment of the utility model, by filling the assembly gap 12 formed between the battery module 20 and the cross beam 11 with a buffer structure 30, the problem of cycle life attenuation and reduced overall thermal insulation performance of the end cells of the battery module 20 due to the above-mentioned assembly gap 12 can be solved, the cycle performance of the battery pack 100 can be improved, and a certain thermal insulation effect can be provided to the battery module 20; and, by including the buffer structure 30 in a flexible packaging bag 31 and a foaming material filled in the flexible packaging bag 31, the fluidity of the foaming material before curing can be utilized, so that the foaming material can fully fill the assembly gap 12 formed between the battery module 20 and the cross beam 11, so that the cycle stress of the end cells of the battery module 20 is more uniform, thereby better improving the cycle performance of the battery pack 100.

[0040] According to some embodiments of the present invention, the flexible packaging bag 31 is a polyester material. The foaming material is a polyester material. By making the flexible packaging bag 31 made of a polyester material similar to the foaming material, for example, the flexible packaging bag 31 can be a PET part, a PE part, a PBT part, etc., it is easy to flow the liquid foaming material in the flexible packaging bag 31, so that the liquid foaming material can fully flow to various positions of the assembly gap 12, so that the liquid foaming material can fully fill the above-mentioned assembly gap 12 after foaming and curing.

[0041] According to some embodiments of the present invention, referring to Figure 1-Figure 3 The top of the flexible packaging bag 31 is opened to form a material inlet 314, and the foaming material is used to enter the flexible packaging bag 31 through the material inlet 314. By forming the material inlet 314 at the top of the flexible packaging bag 31, it is convenient to let the liquid foaming material enter the flexible packaging bag 31 through the material inlet 314, so that the liquid foaming material enters the flexible packaging bag 31 under the action of its own gravity.

[0042] According to some embodiments of the present invention, referring to Figure 3 The flexible packaging bag 31 includes a bag body 311 and a sealing edge 312. The foaming material is contained in the bag body 311. The top of the bag body 311 is open to form a material inlet 314. The sealing edge 312 is connected to the outer edge of the bag body 311. The sealing edge 312 can be formed by hot pressing. The width W of the sealing edge 312 is not less than 5 mm. For example, the width W of the sealing edge 312 is 5 mm, 6 mm, 7 mm, 8 mm, etc. By making the width of the sealing edge 312 of the flexible packaging bag 31 not less than 5 mm, the packaging effect can be ensured and the leakage of the foaming material can be avoided.

[0043] According to some embodiments of the present invention, referring to Figure 1-Figure 3 The upper end of the flexible packaging bag 31 is formed as a sealing end 313, and a material inlet 314 is defined in the sealing end 313. The sealing end 313 is provided with a double-sided adhesive layer, and the sealing end 313 is bonded to the double-sided adhesive layer to seal the material inlet 314. After the liquid foaming material is injected into the flexible packaging bag 31 through the material inlet 314, by providing a double-sided adhesive layer at the sealing end 313, the sealing end 313 can be bonded and sealed by the double-sided adhesive layer, so that during the foaming process of the liquid foaming material injected into the flexible packaging bag 31, the foaming material can be prevented from overflowing through the sealing end 313, and water mist can also be prevented from entering to affect the performance of the foaming material.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 3The sealing end 313 includes a first packaging wall 315 and a second packaging wall 316 arranged opposite to each other along the second direction, the double-sided adhesive layer includes a first double-sided adhesive layer 41 and a second double-sided adhesive layer 42, the wall surface of the first packaging wall 315 facing the material inlet 314 is provided with the first double-sided adhesive layer 41, the wall surface of the second packaging wall 316 facing away from the material inlet 314 is provided with the second double-sided adhesive layer 42, a folding mark 317 is formed on the bottom edge of the second packaging wall 316, the wall surface of the second packaging wall 316 facing the material inlet 314 is bonded to the first double-sided adhesive layer 41, and the second double-sided adhesive layer 42 is bonded to the outer wall surface of the flexible packaging bag 31.

[0045] In the process of sealing the sealing end 313, the second packaging wall 316 can be first bonded to the first packaging wall 315 through the first double-sided adhesive layer 41, so as to achieve the sealing of the material inlet 314, and then the second packaging wall 316 can be folded downward along the folding mark 317, so that the side of the second packaging wall 316 provided with the second double-sided adhesive layer 42 is opposite to the outer wall surface of the flexible packaging bag 31, and the second packaging wall 316 is bonded to the outer wall surface of the flexible packaging bag 31 through the second double-sided adhesive layer 42, so as to achieve secondary sealing, improve the sealing effect, and better avoid leakage or overflow of the foaming material from the sealing end 313 during the foaming process.

[0046] According to the second embodiment of the present invention, the glue injection nozzle 50 is Figure 4-Figure 5 Combined with Figure 1-Figure 2 The glue injection nozzle 50 is used for the battery pack 100 according to the first embodiment of the utility model, and is suitable for injecting liquid foaming material into the flexible packaging bag 31 through the glue injection nozzle 50. The glue injection nozzle 50 can cooperate with the material inlet 314 of the flexible packaging bag 31.

[0047] The glue injection nozzle 50 includes a funnel portion 51 and a glue outlet portion 52. The funnel portion 51 has a glue injection cavity 511 and a glue injection port 512 connected to the glue injection cavity 511. The glue outlet portion 52 is connected to a side of the funnel portion 51 away from the glue injection port 512. The glue outlet portion 52 has a discharge cavity 521 and a glue outlet 522 connected to the discharge cavity 521. The discharge cavity 521 is connected to the glue injection cavity 511. The glue outlet 522 is located on a side of the discharge cavity 521 away from the glue injection cavity 511.

[0048] During the process of injecting the foaming material into the flexible packaging bag 31, the glue injection nozzle 50 is installed at the glue outlet end of the glue gun, and the glue gun equipped with the above-mentioned glue injection nozzle 50 is held so that the glue injection nozzle 50 is inserted into the upper end of the flexible packaging bag 31. At this time, the glue outlet portion 52 is located below the funnel portion 51 and the glue outlet portion 52 is located in the flexible packaging bag 31, and the funnel portion 51 is located at the material inlet 314. The funnel portion 51 includes a first side wall 513 and a second side wall 514 arranged opposite to each other along the second direction, wherein the first side wall 513 faces the battery module 20 side, and the second side wall 514 faces the beam 11 side. The funnel portion 51 can be supported and limited by the beam 11 and the battery module 20. The liquid foaming material enters the glue injection cavity 511 through the glue injection port 512, and then flows downward into the discharge cavity 521, and finally flows into the flexible packaging bag 31 through the glue outlet 522.

[0049] The cross-sectional area of ​​the glue injection cavity 511 gradually increases in the direction from the glue outlet 52 to the funnel 51. By setting the cross-sectional area of ​​the glue injection cavity 511 to gradually increase in the direction from the glue outlet 52 to the funnel 51, the glue injection port 512 can be made larger, which facilitates the injection of liquid foaming material into the glue injection nozzle 50 through the glue injection port 512.

[0050] In addition, by making the glue injection nozzle 50 include the funnel portion 51 and the glue outlet portion 52, the size of the glue outlet portion 52 can be adapted to the narrow space of the assembly gap 12, for example, the size of the glue outlet portion 52 in the second direction is small, for example, the glue outlet portion 52 can be flat. The glue outlet portion 52 can be in an inverted trapezoidal shape. The glue injection nozzle 50 as a whole can be in a "whistle" shape.

[0051] According to the glue injection nozzle 50 of the embodiment of the utility model, the glue injection nozzle 50 is used for the battery pack 100 according to the embodiment of the first aspect of the utility model. During the production process of the battery pack 100, the glue injection nozzle 50 can be used to conveniently inject liquid foaming material into the flexible packaging bag 31; and, by configuring the glue injection nozzle 50 to include the above-mentioned funnel portion 51 and the glue outlet portion 52, the configuration of the funnel portion 51 facilitates the injection of liquid foaming material into the glue injection nozzle 50, and the configuration of the glue outlet portion 52 facilitates the extension of part of the glue injection nozzle 50 into the flexible packaging bag 31, so as to ensure that the foaming material passing through the glue injection nozzle 50 can smoothly enter the flexible packaging bag 31, thereby improving the convenience and efficiency of injecting the foaming material into the flexible packaging bag 31.

[0052] According to some embodiments of the present invention, referring to Figure 4-Figure 5 Combined with Figure 1-Figure 2The funnel portion 51 includes a first side wall 513 and a second side wall 514 that are arranged opposite to each other along the second direction. The distance between the first side wall 513 and the second side wall 514 gradually increases in the direction from the glue outlet portion 52 to the funnel portion 51. The first side wall 513 extends in the vertical direction, and the second side wall 514 extends obliquely in the direction away from the first side wall 513 from the glue outlet portion 52 to the funnel portion 51. By setting the first side wall 513 as a straight wall extending in the vertical direction, it is convenient for the liquid foaming material to flow downward, and by setting the second side wall 514 as an inclined wall inclined in the direction of the cross beam 11, the cross beam 11 can provide support for the glue injection nozzle 50, which is convenient for alleviating the impact force of the liquid foaming material in the process of squeezing and falling, preventing the glue injection nozzle 50 from falling off, and preventing the battery cell of the battery module 20 from being crushed.

[0053] According to some embodiments of the present invention, referring to Figure 4-Figure 5 The cross section of the discharge cavity 521 is in the shape of a letter "I". By setting the cross section of the discharge cavity 521 to be in the shape of a letter "I", the size of the discharging portion 52 in the second direction can be made smaller and matched with the assembly gap 12, so that the discharging portion 52 can be easily extended into the assembly gap 12.

[0054] According to some embodiments of the present invention, referring to Figure 4-Figure 5 The glue outlet 522 is in a straight line shape. By making the glue outlet 522 in a straight line shape, the pressure of the foaming material injection process can be relieved, and at the same time, the glue outlet 522 can be prevented from being partially solidified and blocked by the glue.

[0055] According to some embodiments of the present invention, referring to Figure 4-Figure 5 The edge of the glue outlet 522 is used as an arc guide to facilitate inserting the glue outlet portion 52 of the glue injection nozzle 50 into the assembly gap 12.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A box body, the box body comprising a beam extending along a first direction; A battery module, wherein the battery module is disposed in the box, the crossbeam is located on at least one side of the battery module along a second direction, the second direction is perpendicular to the first direction, and an assembly gap is provided between the battery module and the crossbeam; The buffer structure is filled in the assembly gap and comprises a flexible packaging bag and a foaming material. The flexible packaging bag is accommodated in the assembly gap, and the foaming material is filled in the flexible packaging bag.

2. The battery pack according to claim 1, characterized in that: The flexible packaging bag is made of polyester material.

3. The battery pack according to claim 1, characterized in that: The top of the flexible packaging bag is opened to form a material inlet, and the foaming material is used to enter the flexible packaging bag through the material inlet.

4. The battery pack according to claim 3, characterized in that: The flexible packaging bag comprises a bag body and a sealed edge, wherein the sealed edge is connected to the outer edge of the bag body, the top of the bag body is open to form the material inlet, and the width of the sealed edge is not less than 5 mm.

5. The battery pack according to claim 3, characterized in that: The upper end of the flexible packaging bag is formed as a sealing end, the sealing end defines the material inlet, the sealing end is provided with a double-sided adhesive layer, and the sealing end is bonded to the double-sided adhesive layer to seal the material inlet.

6. The battery pack according to claim 5, characterized in that: The sealing end includes a first packaging wall and a second packaging wall arranged opposite to each other along a second direction, the double-sided adhesive layer includes a first double-sided adhesive layer and a second double-sided adhesive layer, the wall surface of the first packaging wall facing the material inlet is provided with the first double-sided adhesive layer, the wall surface of the second packaging wall facing away from the material inlet is provided with the second double-sided adhesive layer, a folding mark is formed on the bottom edge of the second packaging wall, the wall surface of the second packaging wall facing the material inlet is bonded to the first double-sided adhesive layer, and the second double-sided adhesive layer is bonded to the outer wall surface of the flexible packaging bag.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery module includes a plurality of battery cells arranged along the second direction, the battery cells are blade batteries, the thickness direction of the battery cells is consistent with the second direction, the length direction of the battery cells extends along the first direction, and the assembly gap extends along the first direction.

8. A glue injection nozzle, characterized in that: The glue injection nozzle is used for the battery pack according to any one of claims 1 to 7, and is suitable for injecting foaming material into the flexible packaging bag through the glue injection nozzle, and the glue injection nozzle includes: A funnel portion, the funnel portion having a glue injection cavity and a glue injection port communicated with the glue injection cavity; A glue outlet portion, the glue outlet portion is connected to a side of the funnel portion away from the glue injection port, the glue outlet portion has a material outlet cavity and a glue outlet communicated with the material outlet cavity, the material outlet cavity is communicated with the glue injection cavity, the glue outlet is located on a side of the material outlet cavity away from the glue injection cavity, and in the process of injecting the foaming material into the flexible packaging bag, the glue outlet portion is located below the funnel portion and inside the flexible packaging bag; Wherein, the cross-sectional area of ​​the glue injection cavity gradually increases in the direction from the glue outlet portion to the funnel portion.

9. The glue injection nozzle according to claim 8, characterized in that: The funnel portion includes a first side wall and a second side wall that are oppositely arranged along the second direction, the spacing between the first side wall and the second side wall gradually increases in the direction from the glue outlet portion to the funnel portion, the first side wall extends in a vertical direction, and the second side wall extends obliquely in the direction from the glue outlet portion to the funnel portion toward a direction away from the first side wall.

10. The glue injection nozzle according to claim 8, characterized in that: The cross section of the material discharge cavity is in the shape of a letter "I", the glue outlet is in the shape of a letter "I", and the glue discharge portion is in the shape of an inverted trapezoid.

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