CN218996807U - Protective film hot melting equipment - Google Patents

Abstract

The utility model discloses a protective film hot melting device, which comprises: hem subassembly, hem subassembly includes: the electric core comprises a folding knife and a first driving piece, wherein the folding knife is driven by the first driving piece to move, and the folding knife is used for wrapping the protective film on the side surface of the electric core in the first direction; the first hot melting assembly is arranged above the flanging assembly, is a laser assembly and is used for hot melting the joint edge of the protective film; the second hot melting assembly is arranged below the edge folding assembly, is a laser assembly and is used for hot melting the side edges of the protective film in the first direction and/or the second direction. The first hot melting assembly and the second hot melting assembly synchronously perform laser hot melting on the lap edge and the side edge of the protective film, so that the efficiency is high, the stability is good, and the product quality is guaranteed.

Description

Protective film hot melting equipment

Technical Field

The utility model relates to the technical field of battery cells, in particular to a protective film hot melting device.

Background

The manufacturing process of the lithium ion battery is mainly to carry out coating on the battery core, then to wrap the battery core by the insulating film, to be thermally fused with the side plate and the spacer ring assembly, and finally to weld the electrode lug on the cover plate assembly, thereby playing the roles of fixing the battery core, preventing subsequent shell entering scratch and the like.

In the related art, a mode of heating a resistance wire to perform hot melting of a protective film and a side plate spacer ring is adopted, so that the phenomenon of hot melting wire drawing or melting point falling is easily caused, and the product quality is influenced. And the arrangement of the hot melting stations is unreasonable, and the protection film can be tilted during hot melting, so that the hot melting is invalid and the hot melting efficiency is low.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the protective film hot-melting equipment, the first hot-melting assembly and the second hot-melting assembly synchronously perform laser hot-melting on the joint edge and the side edge of the protective film, the efficiency is high, the stability is good, and the product quality is ensured.

The protective film hot melting equipment according to the embodiment of the utility model comprises: a hemming assembly, the hemming assembly comprising: the electric core comprises a folding knife and a first driving piece, wherein the first driving piece drives the folding knife to move, and the folding knife is used for wrapping a protective film on the side surface of the electric core in a first direction; the first hot melting assembly is arranged above the flanging assembly, is a laser assembly and is used for hot melting the joint edge of the protective film; the second hot melting assembly is arranged below the flanging assembly, is a laser assembly and is used for hot melting the side edges of the protective film in the first direction and/or the second direction.

According to the protective film hot-melting equipment provided by the embodiment of the utility model, the first hot-melting assembly and the second hot-melting assembly synchronously perform laser hot-melting on the joint edge and the side edge of the protective film, so that the efficiency is high, the stability is good, and the product quality is ensured.

According to some embodiments of the utility model, the number of the folding knives is four, two of the first driving pieces are in transmission connection with one of the folding knives, the other two of the first driving pieces are in transmission connection with the other folding knife, one of the folding knives is provided with a first hot melting hole, and the first hot melting hole corresponds to the first hot melting assembly.

According to some embodiments of the utility model, one of the folding knives is provided with second heat-fusible holes on both ends in the third direction, the second heat-fusible holes corresponding to the first heat-fusible components.

According to some embodiments of the utility model, the first holes are a plurality of holes and are spaced apart in the third direction, and the second holes are a plurality of holes and are spaced apart in the first direction.

According to some embodiments of the utility model, the first hot melt assembly comprises: the first hot melt piece and the second driving piece, the second driving piece with first hot melt piece transmission is connected and drive first hot melt piece removes in the third direction.

According to some embodiments of the utility model, the second hot melt assembly comprises: the battery cell comprises a battery cell body, a first hot-melt piece, a second hot-melt piece, a third hot-melt piece and a fourth hot-melt piece, wherein the second hot-melt piece and the third hot-melt piece are arranged at intervals in the second direction of the battery cell, and the fourth hot-melt piece is arranged below the battery cell in the first direction.

According to some embodiments of the utility model, the protective film hot-melt apparatus further includes: the first subassembly that compresses tightly, first subassembly that compresses tightly set up in the both ends of hem subassembly in the third direction, first subassembly that compresses tightly includes: the first pressing piece and the elastic piece drive the first pressing piece to move towards the battery cell so as to press the protective film on the side face of the battery cell in the second direction, and the second hot melting piece and the third hot melting piece correspond to the pressing piece.

According to some embodiments of the utility model, the first pressing member is zinc selenide glass.

According to some embodiments of the utility model, the first compression assembly further comprises: the second compressing piece and the third driving piece are in transmission connection, and the second compressing piece is arranged on two sides of the battery cell in the second direction and is arranged at intervals with the first compressing piece.

According to some embodiments of the utility model, the number of the edge folding assemblies is two, the second hot-melt piece is arranged between the two edge folding assemblies, the number of the second hot-melt piece is one, and the number of the third hot-melt piece, the number of the fourth hot-melt piece and the number of the first hot-melt pieces are two.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of one direction of a protective film hot-melt apparatus according to an embodiment of the present utility model;

fig. 2 is a schematic view of another direction of a protective film hot-melt apparatus according to an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a hemming assembly according to an embodiment of the utility model;

FIG. 4 is a schematic view of a first fuse assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic view of the structure of a folding knife according to an embodiment of the present utility model;

FIG. 6 is a partial schematic view of FIG. 5;

FIG. 7 is a schematic view of the structure of the folding knife assembly and the first compression assembly according to an embodiment of the present utility model;

FIG. 8 is a partial schematic view of a first hold-down assembly according to an embodiment of the utility model;

fig. 9 is a schematic diagram of a second hot melt assembly and a battery cell according to an embodiment of the present utility model.

Reference numerals:

100. a protective film hot-melting device;

10. a hemming assembly; 11. a folding knife; 111. a first hot melt hole; 112. a second hot melt hole; 12. a first driving member; 13. a first lifting assembly;

20. a first hot melt assembly; 21. a first hot melt member; 22. a second driving member;

30. a second hot melt assembly; 31. a second hot melt member; 32. a third heat-fusible member; 33. a fourth hot melt member;

40. a first compression assembly; 41. a first pressing member; 42. an elastic member; 43. a second pressing member; 44. a third driving member; 45. a second lifting assembly;

50. and a battery cell.

Detailed Description

Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.

A protective film hot-melt apparatus 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 9.

As shown in connection with fig. 1 to 3, the protective film hot-melt apparatus 100 includes: the hem assembly 10, the first hot melt assembly 20 and the second hot melt assembly 30, the hem assembly 10 comprising: the electric power generation device comprises a folding knife 11 and a first driving piece 12, wherein the first driving piece 12 drives the folding knife 11 to move, and the folding knife 11 is used for wrapping a protective film on the side face of the electric core 50 in the first direction. Specifically, the hemming assembly 10 includes a hemming blade 11 and a first driving member 12, and the first driving member 12 can drive the hemming blade 11 to move, and wrap a protective film on a side surface of the battery cell 50 in a first direction, i.e., an up-down direction. In addition, the flanging component 10 further comprises a first lifting component 13, the first lifting component 13 stretches out, then the first driving piece 12 stretches out to drive the folding knife 11 to move towards the battery core 50, and the folding knife 11 is pushed to bend the lap edge at one side of the battery core 50, and the bending is performed and then the bending is performed; the first driving part 12 pushes the folding knife 11 to continuously bend the joint edge at the other side of the battery cell 50, after bending, the folding knife is pressed down to enable the two layers of films to be fully contacted, the protective film is bent for 90 degrees towards the direction of the battery cell 50, and the protective film is lapped on the side surface of the battery cell 50 in the first direction, so that the operation of wrapping the protective film on the side surface of the battery cell 50 in the first direction is completed.

As shown in fig. 1 and 2, the first heat-melting assembly 20 is disposed above the hemming assembly 10, and the first heat-melting assembly 20 is a laser assembly and is used for heat-melting the lap edge of the protective film. Specifically, the first hot-melting assembly 20 is located above the flanging assembly 10, the first hot-melting assembly 20 is a laser assembly, the protective film forms a lap edge on the side surface of the battery cell 50 in the first direction, and the first hot-melting assembly 20 carries out hot melting on the lap edge of the protective film.

The laser component adopts CO2 gas laser hot melting, emits light beams with specific wavelength and high power as a heat source, provides highly concentrated energy, and transmits the highly concentrated energy to the surface of the protective film in a heat form, so that the protective film is heated and has viscosity, and the protective film is fused with each other.

In addition, the second heat-melting assembly 30 is disposed below the hemming assembly 10, and the second heat-melting assembly 30 is a laser assembly and is used for heat-melting the side edge of the protective film in the first direction and/or the second direction. Specifically, the second heat-melting assembly 30 is located below the edge folding assembly 10, the second heat-melting assembly 30 is also a laser assembly, and the second heat-melting assembly 30 performs laser heat-melting on the edge of the protective film wrapping the battery cell 50, that is, the side edge of the protective film in the first direction and the side edge of the protective film in the second direction. The first and second heat-staking assemblies 20 and 30 cooperate to provide simultaneous laser heat-staking of the overlapping edges and sides.

Therefore, the first hot melting assembly 20 and the second hot melting assembly 30 carry out synchronous laser hot melting on the joint edge and the side edge of the protective film, the efficiency is high, the stability is good, and the product quality is guaranteed.

As shown in fig. 3, 5 and 6, the number of the folding knives 11 is two, the number of the first driving parts 12 is four, wherein the two first driving parts 12 are in transmission connection with one folding knife 11, the other two first driving parts 12 are in transmission connection with the other folding knife 11, one folding knife 11 is provided with a first hot melting hole 111, and the first hot melting hole 111 corresponds to the first hot melting assembly 20. Specifically, the number of the folding knives 11 is two, the number of the first driving parts 12 is four, and one folding knife 11 is in transmission connection with two first driving parts 12, namely, the two first driving parts 12 drive one folding knife 11 to act; the other folding knife 11 is in transmission connection with the other two first driving members 12, i.e. the other two first driving members 12 drive the other folding knife. Wherein, the folding knife 11 is zigzag, and two folding knives 11 are mutually staggered and matched, carry out complete overlap joint with the overlap edge through zigzag staggering, realize the complete overlap joint of insulating film through the cooperation of two folding knives 11, guaranteed the reliability of insulating film overlap joint before the hot melt.

One of the folding knives 11 is provided with a first hot melting hole 111, the first hot melting assembly 20 emits laser, the laser can penetrate through the first hot melting hole 111 to carry out hot melting of the accurate position of the joint edge area, the laser hot melting efficiency is high, the laser hot melting speed is high, the laser hot melting stability is good, and the product quality of the next working procedure is guaranteed.

Further, one of the folding knives 11 is provided with second heat-fusible holes 112 at both ends in the third direction, and the second heat-fusible holes 112 correspond to the first heat-fusible members 20. Specifically, in the third direction, that is, in the axial direction of the battery cell 50, two ends of one folding knife 11 in the third direction are further provided with second hot-melt holes 112, the second hot-melt holes 112 correspond to the first hot-melt assemblies 20, and the second hot-melt holes 112 are located at two ends of the lap joint edge, so that the first hot-melt assemblies 20 perform laser hot-melt on two ends of the protective film in the third direction, and the protective film is ensured to be integrally attached to the battery cell 50.

Further, the first heat-fusible holes 111 are plural and are arranged at intervals in the third direction, and the second heat-fusible holes 112 are plural and are arranged at intervals in the first direction. Specifically, the folding knife 11 is provided with a plurality of first hot melting holes 111, and in the third direction, the plurality of first hot melting holes 111 are arranged on the folding knife 11 at intervals, so that the laser emitted by the first hot melting assembly 20 can completely cover the lap edge, the hot melting of the lap edge is more comprehensive, and the stability of the protective film of the battery cell 50 is ensured.

As shown in fig. 1 to 4, the first fuse assembly 20 includes: the first hot melt member 21 and the second driving member 22, the second driving member 22 and the first hot melt member 21 are in transmission connection, and the second driving member 22 drives the first hot melt member 21 to move in the third direction. Specifically, the first hot-melting assembly 20 includes a first hot-melting element 21 and a second driving element 22, the first hot-melting element 21 is located above the hemming assembly 10, and the first hot-melting element 21 can emit a light beam with a specific wavelength and high power as a heat source to perform laser hot-melting on the lap edges. The second driving piece 22 is connected with the first hot-melt piece 21 in a transmission way, the second driving piece 22 can drive the first hot-melt piece 21 to move in the third direction, the first hot-melt piece 21 emits laser, and therefore the first hot-melt piece 21 can carry out laser hot-melt on the lap joint edge along the third direction, the efficiency is high, the speed is high, the stability is good, and the product quality of the next procedure is guaranteed.

As shown in connection with fig. 1 and 2, the second heat fusing assembly 30 includes: the second heat-melting piece 31, the third heat-melting piece 32 and the fourth heat-melting piece 33, the second heat-melting piece 31 and the third heat-melting piece 32 are arranged at intervals in the second direction of the battery cell 50, and the fourth heat-melting piece 33 is arranged below the battery cell 50 in the first direction. Specifically, the second heat-melting assembly 30 includes a second heat-melting element 31, a third heat-melting element 32 and a fourth heat-melting element 33, in the second direction of the battery cell 50, that is, the left-right direction of the battery cell 50, the second heat-melting element 31 and the third heat-melting element 32 are located at two sides of the battery cell 50 and are spaced from each other, one side edge of the battery cell 50 in the second direction is laser-heat-melted by the second heat-melting element 31, and the other side edge of the battery cell 50 in the second direction is laser-heat-melted by the third heat-melting element 32. In the first direction of the battery cell 50, the fourth heat-fusing member 33 is located below the battery cell 50, and the fourth heat-fusing member 33 performs laser heat-fusing on the side of the battery cell 50 below in the first direction.

Referring to fig. 6 to 9, the protective film hot-melt apparatus 100 further includes: the first pressing assembly 40, the first pressing assembly 40 is disposed at two ends of the hemming assembly 10 in the third direction, and the first pressing assembly 40 includes: the first pressing member 41 and the elastic member 42, the elastic member 42 drives the first pressing member 41 to move toward the battery cell 50 to press the protective film on the side of the battery cell 50 in the second direction, and the second and third heat- fusible members 31 and 32 each correspond to the pressing member. Specifically, the protective film hot melting apparatus 100 further includes a first pressing assembly 40, and in the third direction of the battery cell 50, the first pressing assembly 40 is located at two ends of the hemming assembly 10, and the first pressing assembly 40 presses the sides of two poles of the battery cell 50. The first pressing assembly 40 further includes a first pressing member 41 and an elastic member 42, and the first pressing member 41 moves under the force of the elastic member 42 until contacting and clamping the two sides of the battery cell 50 in the second direction, thereby ensuring that the battery cell 50 is thermally fused in a completely pressed state, and the protection film is not tilted, and the first pressing member 41 is not pressed tightly, thereby causing a thermal fusion failure and occurrence of poor thermal fusion effect.

Wherein the first pressing member 41 is zinc selenide glass. The zinc selenide glass has extremely low absorption coefficient in a 1064nm wave band (the CO2 laser output laser wave band), and has good imaging characteristics and thermal shock characteristics. And the anti-reflection film AR10.6 plated on the surface of the zinc selenide glass can further increase the light transmittance of CO2 laser, can enable the light transmittance of the CO2 laser to reach 98.5%, and can improve the performances of wear resistance, oxidation resistance and the like of the zinc selenide glass.

As shown in fig. 3 and 5, the first compressing assembly 40 further includes: the second pressing member 43 and the third driving member 44, the third driving member 44 is in transmission connection with the second pressing member 43, and the second pressing member 43 is arranged at two sides of the battery cell 50 in the second direction and is spaced from the first pressing member 41. Specifically, the first compressing assembly 40 further includes a second compressing member 43 and a third driving member 44, where the second compressing member 43 is in transmission connection with the third driving member 44, and the third driving member 44 drives the second compressing member 43 to move. The second pressing members 43 are located at both sides of the battery cell 50 in the second direction, the second pressing members 43 are spaced apart from the first pressing members 41, and the second pressing members 43 are in driving connection with the first pressing members 41. The third driving member 44 drives the second pressing member 43 to move toward the battery cell 50, and the first pressing member 41 in driving connection with the second pressing member 43 contacts and clamps two sides of the battery cell 50 in the second direction under the force of the elastic member 42 to press the sides of two poles of the battery cell 50.

In addition, the first compressing assembly 40 further comprises a second lifting assembly 45, when the battery cell 50 reaches a designated station, the second lifting assembly 45 descends, the second compressing member 43 reaches two sides of the battery cell 50, then the third driving member 44 drives the second compressing member 43 to clamp the battery cell 50, and the battery cell 50 is clamped and positioned through the second compressing member 43, so that the side edge of the battery cell 50 is ensured to be thermally fused in a completely compressed state, and the situation that the protective film is not tilted and compressed tightly to cause thermal fusion failure and poor thermal fusion effect is avoided.

As shown in fig. 1, 2 and 9, the hemming assemblies 10 are two, the second heat-fusible members 31 are disposed between the two hemming assemblies 10 and the second heat-fusible members 31 are one, and the third heat-fusible members 32, the fourth heat-fusible members 33 and the first heat-fusible members 20 are two. Specifically, the two edge folding assemblies 10 are in a double-station mode, and the second heat-melting piece 31 is located between the two edge folds, so that two opposite sides of the two battery cells 50 in the second direction can be melted simultaneously. The number of the third hot-melt pieces 32, the fourth hot-melt pieces 33 and the first hot-melt assemblies 20 is two, when in hot-melt, the two electric cores 50 are simultaneously hot-melted, the protective film is subjected to laser hot-melt at one time, and after the hot-melt is completed, the first hot-melt assembly 20 and the second hot-melt assembly 30 start to reset and return, and the next electric core 50 is waited for in place. By adopting the double-station design, the laser hot melting can be performed on the two battery cells 50 at the same time, thereby achieving the purposes of high-efficiency automation and greatly improving the hot melting efficiency of the product.

The working flow of the protective film hot-melt apparatus 100 according to the embodiment of the utility model is described below with reference to fig. 1 to 9.

As shown in fig. 3, when the battery cell 50 reaches a designated station, the second lifting assembly 45 descends to enable the second pressing member 43 to reach two sides of the battery cell 50, and then the third driving member 44 drives the second pressing member 43 to clamp the battery cell 50. The second pressing element 43 clamps and positions the battery cell 50, so that the folding knife 11 bends the joint edge and melts the long edge and the short edge of the protective film.

Meanwhile, as shown in fig. 3, the third driving member 44 retracts to drive the pressing block, so that the first pressing member 41 contacts and clamps the long sides of the two sides of the battery cell 50 under the acting force of the elastic member 42, and the first pressing member 41 is pressed and fixed on the pressing block by the pressing block. The first lifting component 13 stretches out and drives the guide rail mounting plate to descend through the electric cylinder connecting component, and one of the first driving components drives the guide rail mounting plate to descend after reaching a specified height

The piece 12 stretches out to push the left folding knife 11 to bend the joint edge at one side of the battery cell 50, and the left folding knife is pressed down after bending; the other first driving 5 piece 12 stretches out to push the right folding knife 11 to bend the joint edge at the other side of the battery cell 50, and after bending, the two layers of films are fully contacted by pressing down.

The left folding knife 11 and the right folding knife 11 respectively move in a matched mode, the left folding edge and the right folding edge are respectively and completely overlapped through mutually staggered saw teeth, and the right folding knife 11 does not withdraw after the overlapping is finished.

Next, referring to fig. 9, after the cell 50 is folded and overlapped, the first hot-melt member 21 starts to operate with heat

The light flux of (a) is transmitted to the surface of the protective film (the joint surface) through the light emitting head of the first heat fusion member 21 to fuse the mutually overlapped protective film phases 0, and at this time, the upper short side and the joint side have rectangular melting points. When the battery cell 50 is longer, the second driving member 22 drives the bridging edge to be excited

The optical assembly moves to complete laser hot melting of all the hot melting points of the bridging edges of the cell 50.

Meanwhile, referring to fig. 2, the second, third and fourth heat-fusing members 31, 32 and 33 complete laser heat-fusing at one time, at this time, the laser heat-fuses the protective film on the positive and negative electrode spacers of the third direction cell 50 through the first compressing member 41,

long-side thermal melting points occur on both sides of the cell 50 in the second direction, and lower short-side thermal melting points occur below the cell 50 in the first direction. In the description of the present utility model, it is to be understood that the terms "center", "longitudinal", "transverse", "length", and "longitudinal" are used in the sense of the present utility model,

"width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counter-clockwise", "axial", "radial"

The azimuth or positional relationship indicated by the "circumferential direction" or the like is based on the azimuth or positional relationship shown in the drawings, and is for convenience of description

The utility model and the simplified description do not indicate or imply that the device or element in question must have a particular orientation, be constructed and operate in a particular orientation of 0, and therefore should not be construed as limiting the utility model.

In the description of the present specification, reference is made to the terms "one embodiment," "some embodiments," "illustrative embodiments," and the like,

The description of "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

5 while embodiments of the present utility model have been shown and described, it will be appreciated by those of ordinary skill in the art that: in no take-off

Many variations, modifications, substitutions and alterations are possible in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A protective film hot-melt apparatus (100), characterized by comprising:

a hemming assembly (10), the hemming assembly (10) comprising: a folding knife (11) and a first driving piece (12), wherein the first driving piece (12) drives the folding knife (11) to move, and the folding knife (11) is used for wrapping a protective film on the side surface of the battery cell (50) in the first direction;

the first hot melting assembly (20) is arranged above the flanging assembly (10), and the first hot melting assembly (20) is a laser assembly and is used for hot melting the lap edges of the protective film;

the second hot melting assembly (30), second hot melting assembly (30) set up in the below of hem subassembly (10), second hot melting assembly (30) are laser component and are used for right the lateral side hot melting of protection film in first direction and/or second direction.

2. The protective film hot-melt apparatus (100) according to claim 1, wherein the number of the folding knives (11) is two, the number of the first driving members (12) is four, two of the first driving members (12) are in transmission connection with one of the folding knives (11), the other two of the first driving members (12) are in transmission connection with the other folding knife (11), one of the folding knives (11) is provided with a first hot-melt hole (111), and the first hot-melt hole (111) corresponds to the first hot-melt assembly (20).

3. The protective film heat fusion apparatus (100) according to claim 2, wherein one of the folding knives (11) is provided with second heat fusion holes (112) on both ends in a third direction, the second heat fusion holes (112) corresponding to the first heat fusion assembly (20).

4. The protective film heat fusion apparatus (100) according to claim 3, wherein the first heat fusion holes (111) are plural and arranged at intervals in the third direction, and the second heat fusion holes (112) are plural and arranged at intervals in the first direction.

5. The protective film hot-melt apparatus (100) of claim 1, wherein said first hot-melt assembly (20) comprises: the device comprises a first hot melt piece (21) and a second driving piece (22), wherein the second driving piece (22) is in transmission connection with the first hot melt piece (21) and drives the first hot melt piece (21) to move in a third direction.

6. The protective film hot-melt apparatus (100) according to claim 1, wherein the second hot-melt assembly (30) comprises: the battery cell comprises a battery cell (50), a first hot-melt piece (31), a second hot-melt piece (32) and a fourth hot-melt piece (33), wherein the second hot-melt piece (31) and the third hot-melt piece (32) are arranged at intervals in the second direction of the battery cell (50), and the fourth hot-melt piece (33) is arranged below the battery cell (50) in the first direction.

7. The protective film hot-melt apparatus (100) according to claim 6, further comprising: first compacting assembly (40), first compacting assembly (40) set up in hem subassembly (10) are in the both ends of third direction, first compacting assembly (40) include: the first pressing piece (41) and the elastic piece (42), the elastic piece (42) drives the first pressing piece (41) to move towards the battery cell (50) so as to press the protective film on the side surface of the battery cell (50) in the second direction, and the second hot melting piece (31) and the third hot melting piece (32) correspond to the pressing pieces.

8. The protective film hot-melt apparatus (100) according to claim 7, wherein the first pressing member (41) is zinc selenide glass.

9. The protective film hot melt apparatus (100) of claim 7, wherein said first hold down assembly (40) further comprises: the second compressing element (43) and the third driving element (44), the third driving element (44) is in transmission connection with the second compressing element (43), the second compressing element (43) is arranged on two sides of the battery cell (50) in the second direction and is arranged at intervals with the first compressing element (41).

10. The protective film hot-melt apparatus (100) according to claim 6, wherein the hemming assemblies (10) are two, the second hot-melt member (31) is disposed between the two hemming assemblies (10) and the second hot-melt member (31) is one, and the third hot-melt member (32), the fourth hot-melt member (33) and the first hot-melt assembly (20) are two.

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