Heat sealing head for packaging soft package lithium battery

Abstract

The utility model belongs to the technical field of soft package lithium battery packaging, and particularly discloses a heat sealing head for soft package lithium battery packaging, which comprises an upper sealing head and a lower sealing head, an electric heating plate and a silica gel plate are arranged at the packaging end of the lower sealing head, the electric heating plate is fixedly connected with the lower sealing head, the silica gel plate covers the upper surface of the electric heating plate, and the silica gel plate is fixedly connected with the upper surface of the upper sealing head. A silica gel protruding strip protruding upwards is arranged on the outer side of the upper end face of the silica gel plate, the cross section of the silica gel protruding strip is in a trapezoid shape, the narrow end face of the silica gel protruding strip faces upwards and is right opposite to the packaging end of the upper sealing head, and the end, away from the narrow end face, of the silica gel protruding strip is connected with the silica gel plate into a whole. By adopting the packaging structure, the packaging durability can be obviously improved, the packaging requirement of the high-energy density battery design can be met, the quality problems such as liquid leakage caused by poor packaging can be reduced, and the product quality and safety can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to soft package lithium cell packaging technical field, concretely relates to a heat sealing head for soft package lithium cell packaging. BACKGROUND

[0002] With the rapid development of new energy industry, soft package lithium battery is widely used in consumer electronics, electric vehicles and energy storage systems due to its high energy density, lightweight and good safety performance. However, while pursuing higher energy density, the packaging technology of soft package lithium battery also faces many challenges. The existing soft package lithium battery soft sealing packaging generally uses right-angle silica gel plate. With the design of the battery tending to narrower width to improve the energy density, the width of the silica gel plate is also reduced accordingly, which directly leads to the decrease of its stability under high temperature and pressure environment, and is easy to be extruded and deformed or even broken, thereby causing packaging defects, liquid leakage and other quality problems, and seriously affecting the safety and service life of the product. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides a heat sealing head for soft package lithium battery packaging, which can not only significantly improve the packaging durability and meet the packaging requirements of high energy density battery design, but also reduce the quality problems such as liquid leakage caused by poor packaging and ensure the product quality and safety.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A heat sealing head for soft package lithium battery packaging, comprising an upper head and a lower head, the lower head is provided with an electric heating plate and a silica gel plate at the packaging end, the electric heating plate is fixedly connected with the lower head, the silica gel plate is covered on the upper surface of the electric heating plate, the outer side of the upper end surface of the silica gel plate is provided with a silica gel protruding strip protruding upward, the cross-sectional shape of the silica gel protruding strip is trapezoidal, the narrow end surface of the silica gel protruding strip faces upward and is opposite to the packaging end of the upper head, and the end (i.e. wide end) of the silica gel protruding strip away from the narrow end surface is connected with the silica gel plate as a whole.

[0006] As a preferred scheme of the utility model, the outer side surface of the silica gel protruding strip is a vertical surface, which is flush with the outer side surface of the silica gel plate; the inner side surface of the silica gel protruding strip is an inclined surface, which forms a 135-degree angle with the upper end surface of the silica gel plate.

[0007] As a preferred scheme of the utility model, the thickness of the silica gel plate is 1mm.

[0008] As a preferred scheme of the utility model, the thickness of the silica gel protruding strip is 1mm.

[0009] As a preferred scheme of the utility model, the electric heating plate is provided with an electric heating wire.

[0010] As a preferred scheme of the utility model, the lower head is provided with a pressing plate mechanism capable of pressing the silica gel plate on the electric heating plate.

[0011] As a preferred scheme of the utility model, the pressing plate mechanism comprises a pressing plate, a spring and a locking screw, the lower head is provided with a vertically arranged mounting groove and a horizontally arranged threaded hole on the side away from the silica gel plate, the mounting groove is communicated with the threaded hole; the pressing plate is provided with a supporting part and a pressing plate part, the supporting part is in sliding fit with the mounting groove, the pressing plate part is arranged at the upper end of the supporting part and extends towards the side of the silica gel plate; the spring is arranged in the mounting groove, the upper end of the spring is in abutment with the bottom surface of the supporting part, and the lower end of the spring is in abutment with the groove bottom of the mounting groove; the supporting part is provided with an adjusting hole in communication with the threaded hole in a diametrically opposite manner, the bottom surface of the adjusting hole is a slope extending upwards and away from the threaded hole; the locking screw is in threaded connection with the threaded hole, the locking screw can be screwed into the adjusting hole and in abutment with the slope, thereby driving the supporting part to move downwards and enabling the pressing plate part to abut on the silica gel plate.

[0012] As a preferred scheme of the utility model, the pressing plate mechanism is arranged along the length direction of the lower head.

[0013] The heat head for soft package lithium battery packaging provided by the utility model has the advantages of the following compared with the prior art:

[0014] The utility model discloses a trapezoidal structure silica gel convex strip is designed on the silica gel plate, and the narrow end surface is used as the packaging end of the lower head (i.e. the end directly contacting the battery aluminum plastic film and playing a heat pressure sealing role), to ensure that the battery edge is closely combined, and the standard requirement of the packaging width is met, without sacrificing the energy density and capacity of the battery. The wide end of the silica gel convex strip (i.e. away from the battery and close to the heat source transmission end) is substantially connected with the silica gel plate, and the silica gel plate is integrated with the silica gel plate, so that the silica gel plate can quickly recover the original shape through the buffering action of the wide end under the action of high temperature and pressure, even if it deforms to a certain extent for many times, and permanent deformation or rupture is avoided. It can be seen that the utility model can significantly improve the packaging durability, meet the packaging needs of high energy density battery design, reduce the quality problems such as liquid leakage caused by poor packaging, and protect the product quality and safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the utility model embodiment, the drawings of the embodiment will be briefly introduced below.

[0016] Figure 1 The structure schematic view of the heat head for soft package lithium battery packaging provided by the utility model embodiment is shown in the figure.

[0017] Figure 2 Assemble the front view of the lower head, the electric heating plate, the silica gel plate and the pressing plate mechanism in the embodiment of the utility model;

[0018] Figure 3 Assemble the plan view of the lower head, the electric heating plate, the silica gel plate and the pressing plate mechanism in the embodiment of the utility model;

[0019] Figure 4 Assemble the side perspective view of the lower head, the electric heating plate, the silica gel plate and the pressing plate mechanism in the embodiment of the utility model;

[0020] Figure 5 The front view of the pressing plate in the embodiment of the utility model;

[0021] Figure 6 The side view of the pressing plate in the embodiment of the utility model.

[0022] Markings in the figure:

[0023] Upper head 1;Lower head 2;Mounting groove 21;Screw hole 22;Electric heating plate 3;Silica gel plate 4;Silica gel convex strip 41;Narrow end face 41a;Vertical face 41b;Inclined face 41c;Pressing plate mechanism 5;Pressing plate 51;Supporting part 511;Pressing plate part 512;Adjusting hole 513;Inclined face 514;Spring 52. Specific implementation

[0024] The technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model, apparently, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0025] As Figures 1 to 6 Indicated, the utility model discloses a kind of heat head for soft package lithium battery packaging, it includes upper head 1 and lower head 2, the upper head 1 and the lower head 2 are fixed on heat sealing machine by screw, the upper head 1 can be driven to the lower head by the power mechanism of heat sealing machine, to the lower head close, to realize heat pressure sealing connection by the sealing of battery aluminum plastic film Clamping between the packaging end of upper head and the packaging end of lower head.

[0026] In the embodiment, the lower head 2 is provided with an electric heating plate 3 and a silica gel plate 4 at the packaging end, the electric heating plate 3 is fixedly connected with the lower head 2, the silica gel plate 4 is arranged on the upper surface of the electric heating plate 3, the outer side of the upper end surface of the silica gel plate 4 is provided with a silica gel protruding strip 41 protruding upward, the silica gel protruding strip 41 is in a trapezoidal shape in cross section, the narrow end surface 41a of the silica gel protruding strip 41 faces upward and is opposite to the packaging end of the upper head 1, and the end (i.e. the wide end) of the silica gel protruding strip 41 away from the narrow end surface 41a is connected with the silica gel plate 4 integrally.

[0027] Therefore, the heat sealing head for soft package lithium battery packaging according to the embodiment of the utility model has the core technology that: the silica gel protruding strip 41 in trapezoidal structure is designed on the silica gel plate 4, the narrow end surface 41a is used as the packaging end of the lower head 2 (i.e. the end directly contacting the battery aluminum plastic film and playing the role of heat compression sealing), so as to ensure that the battery edge is closely combined, the standard requirement of packaging width is met, and the energy density and capacity of the battery are not sacrificed; the wide end (i.e. the end away from the battery and close to the heat source transmission end) of the silica gel protruding strip 41 is substantially connected with the silica gel plate 4, and is connected with the silica gel plate 4 integrally, so that the silica gel plate 4 can quickly recover the original shape through the buffering effect of the wide end even if a certain degree of deformation occurs under the action of high temperature and pressure, and permanent deformation or rupture is avoided.

[0028] Exemplarily, in order to ensure the durability of the silica gel protruding strip 41 under the action of high temperature and pressure, the outer side surface of the silica gel protruding strip 41 is a vertical surface 41b and is flush with the outer side surface of the silica gel plate 4; the inner side surface of the silica gel protruding strip 41 is an inclined surface 41c and forms a 135-degree angle with the upper end surface of the silica gel plate 4; the thickness of the silica gel plate 4 is 1mm; and the thickness of the silica gel protruding strip 41 is 1mm.

[0029] Exemplarily, the electric heating plate 3 is provided with an electric heating wire, an external circuit and a power supply. When working, the electric heating wire can heat the electric heating plate 3, so that the electric heating plate 3 forms a heat source transmission end to uniformly transmit heat to the silica gel plate 4 and the silica gel protruding strip 41, so as to realize heat compression sealing connection of the battery aluminum plastic film.

[0030] Exemplarily, the lower head 2 is provided with a pressing plate mechanism 5 capable of pressing the silica gel plate 4 against the electric heating plate 3. In a specific implementation, the pressing plate mechanism 5 includes a pressing plate 51, a spring 52 and a locking screw (not shown in the figure), the lower head 2 is provided with a vertically arranged mounting groove 21 and a horizontally arranged threaded hole 22 on a side away from the silica gel plate 4, the mounting groove 21 is in communication with the threaded hole 22; the pressing plate 51 is provided with a support portion 511 and a pressing plate portion 512, the support portion 511 is in sliding fit with the mounting groove 21, the pressing plate portion 512 is arranged at an upper end of the support portion 511 and extends towards the silica gel plate 4 side; the spring 52 is arranged in the mounting groove 21, an upper end of the spring 52 abuts against a bottom surface of the support portion 511, and a lower end of the spring 52 abuts against a groove bottom of the mounting groove 21; the support portion 511 is provided with an adjusting hole 513 in communication with the threaded hole 22, a bottom surface of the adjusting hole 513 is a slope surface 514 extending upwardly and obliquely away from the threaded hole 22; the locking screw is threadedly connected with the threaded hole 22. When the locking screw is screwed into the adjusting hole 513, an end portion of the locking screw can abut against the slope surface 514, thereby driving the support portion 511 to move downwardly against the elastic force of the spring 52, so that the pressing plate portion 512 abuts against the silica gel plate 4, and the silica gel plate 4 is locked; when the locking screw is screwed out of the adjusting hole 513, the end portion of the locking screw gradually separates from the slope surface 514, at this time, the support portion 511 moves upwardly under the action of the elastic force of the spring 52, so that the pressing plate portion 512 releases the silica gel plate 4, and the silica gel plate 4 is unlocked. Thus, through the arrangement of the above-mentioned pressing plate 51 mechanism 5, the silica gel plate 4 can be quickly assembled and disassembled, and maintenance is facilitated.

[0031] Exemplarily, the pressing plate 51 mechanism 5 is arranged in two along the length direction of the lower head 2, so as to ensure the firmness and reliability of the silica gel plate 4 after installation.

[0032] In summary, compared with the prior art, the heat sealing head for packaging the soft package lithium battery has the following advantages:

[0033] (1) Significantly improving the packaging durability: effectively solving the problem that the silica gel plate 4 is easily deformed and broken in a high-temperature and pressure environment, improving the packaging reliability and service life of the soft package lithium battery;

[0034] (2) Ensuring product quality and safety: reducing quality problems such as liquid leakage caused by poor packaging, and improving the overall safety and user satisfaction of the product;

[0035] (3) Adapting to the demand for high energy density: meeting the packaging demand of the market for high energy density soft package lithium battery design under the premise of ensuring the size and capacity of the battery.

[0036] While the preferred embodiments of the application have been described, those skilled in the art will note that various modifications and changes can be made thereto without departing from the spirit and scope of the application. Accordingly, it is intended that all such modifications and changes be included within the scope of the application as claimed.

[0037] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A heat seal head for soft pack lithium battery packaging, comprising an upper head and a lower head, characterized in that, The lower head is provided with an electric heating plate and a silica gel plate at the sealing end of the lower head, the electric heating plate is fixedly connected with the lower head, the silica gel plate is arranged on the upper surface of the electric heating plate, the upper end surface of the silica gel plate is provided with a silica gel protruding strip protruding upward, the cross-sectional shape of the silica gel protruding strip is trapezoidal, the narrow end surface of the silica gel protruding strip faces upward and is opposite to the sealing end of the upper head, and the end of the silica gel protruding strip away from the narrow end surface is connected with the silica gel plate as a whole.

2. The heat-seal head for packaging a pouch lithium battery of claim 1, wherein: The outer side surface of the silica gel protruding strip is a vertical surface and is flush with the outer side surface of the silica gel plate; and the inner side surface of the silica gel protruding strip is an inclined surface and forms an included angle of 135 degrees with the upper end surface of the silica gel plate.

3. The heat-seal head for packaging a pouch lithium battery of claim 1, wherein: The thickness of the silica gel plate is 1 mm.

4. The thermal head for packaging a pouch lithium battery according to claim 1, wherein: The thickness of the silica gel protruding strip is 1 mm.

5. The thermal head for packaging a pouch lithium battery according to claim 1, wherein: The electric heating plate is provided with an electric heating wire.

6. The heat-seal head for packaging a pouch lithium battery of any one of claims 1 to 5, wherein: The lower head is provided with a pressing plate mechanism capable of pressing the silica gel plate against the electric heating plate.

7. The thermal head for packaging a pouch lithium battery according to claim 6, wherein: The pressing plate mechanism comprises a pressing plate, a spring and a locking screw, the lower head is provided with a vertically arranged mounting groove and a horizontally arranged threaded hole on the side away from the silica gel plate, the mounting groove is in communication with the threaded hole; the pressing plate is provided with a supporting portion and a pressing plate portion, the supporting portion is in sliding fit with the mounting groove, the pressing plate portion is arranged at the upper end of the supporting portion and protrudes towards the side of the silica gel plate; the spring is arranged in the mounting groove, the upper end of the spring abuts against the bottom surface of the supporting portion, and the lower end of the spring abuts against the groove bottom of the mounting groove; the supporting portion is provided with an adjusting hole opposite and in communication with the threaded hole, the bottom surface of the adjusting hole is an inclined surface extending upward and away from the threaded hole; the locking screw is threadedly connected with the threaded hole, the locking screw can be screwed into the adjusting hole and abut against the inclined surface, so as to drive the supporting portion to move downward and make the pressing plate portion abut against the silica gel plate.

8. The thermal head for packaging a pouch lithium battery according to claim 7, wherein: Two pressing plate mechanisms are arranged along the length direction of the lower head.

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