Pole core hot-pressing device

Abstract

The utility model provides a pole core hot-pressing device. The pole core hot-pressing device comprises a box body and a hot-pressing structure, a groove for placing a battery cell is formed in the bottom end in the box body, and the depth of the groove is smaller than the height of the battery cell; the hot-pressing structure comprises an upper pressing plate, a spring, a lower pressing plate and a spherical sliding block; the upper pressing plate is telescopically and movably connected with the top end in the box body, the lower pressing plate is located below the upper pressing plate, the lower pressing plate and the upper pressing plate are connected through a plurality of uniformly distributed springs, and the bottom of the lower pressing plate and the groove are flexibly arranged for fitting battery cells; a vacuum cavity is formed in the upper pressing plate, and the spherical sliding block is located in the vacuum cavity and slides according to the change of the compression amount of the spring so as to increase the downward pressing pressure of the connecting area of the lower pressing plate and the spring with the large compression amount. According to the utility model, the elastic deformation of the spring and the like and the matching of the spherical sliding block are utilized, so that the overall stress uniformity of the pole core during hot pressing is improved while the hot pressing pressure on the pole core thinning area is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of pole core processing, in particular to a pole core hot pressing device. Background Art

[0002] When the pole piece is rolled, the coating in the middle area will extend to both sides, causing the coating thickness on the pole ear side to be smaller than other areas, forming a thinned area of ​​the pole core.

[0003] At present, hot pressing equipment basically uses the method of direct contact between the core and the steel plate for hot pressing. Due to the high rigidity of the steel plate, only relatively flat cores can be hot pressed. For the pole core with a thinned area, the traditional hot press cannot fit with it, resulting in poor hot pressing effect in this area, thus affecting the electrochemical performance of the pole core. Secondly, the traditional hot press, which is connected to the external environment, will cause heat loss, resulting in lower actual heat transferred to the pole core, affecting the hot pressing effect. Utility Model Content

[0004] Based on this, it is necessary to provide a pole core hot pressing device to address the problem that the existing hot pressing equipment has poor hot pressing effect on the pole core with thinning area.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A core hot pressing device comprises a box body and a hot pressing structure.

[0007] A groove for placing the battery cell is provided at the bottom of the box body, and the depth of the groove is less than the height of the battery cell;

[0008] The hot pressing structure includes an upper pressing plate, a spring, a lower pressing plate and a spherical slider; the upper pressing plate is telescopically connected to the top of the inner part of the box body, the lower pressing plate is located below the upper pressing plate and the two are connected by a plurality of evenly arranged springs, and the bottom of the lower pressing plate and the inner groove are flexibly arranged to fit the battery cell; a vacuum cavity is provided inside the upper pressing plate, the spherical slider is located in the vacuum cavity and slides according to the compression amount of the spring to increase the downward pressure of the area where the lower pressing plate is connected to the spring with a large compression amount.

[0009] Furthermore, a first thermally conductive silicone pad is bonded to the bottom of the lower pressing plate, a second thermally conductive silicone pad is bonded to the bottom of the groove, and the battery cell is placed on top of the second thermally conductive silicone pad.

[0010] Furthermore, the thickness of the first thermally conductive silicone pad is 1.5-5 mm.

[0011] Furthermore, a telescopic cylinder is provided at the inner top of the box body. The telescopic cylinder is longitudinally arranged and the movable end is rotatably connected to the lower pressure plate. There is a rotation gap at the connection between the lower pressure plate and the movable end of the telescopic cylinder to cooperate with the spherical slider to slide in the vacuum cavity.

[0012] Furthermore, heating guide wires are embedded inside the lower pressing plate and in the groove.

[0013] Furthermore, the box body is an overall closed structure, with a door hinged at the bottom opening on one side.

[0014] Furthermore, a heat-insulating layer is bonded to the inner wall of the box, and the thickness of the heat-insulating layer is at least 10 mm.

[0015] Furthermore, the hatch uses a door panel made of a transparent material, there is no insulation layer in the inner area of ​​the hatch, and the hatch is used as an observation window.

[0016] Furthermore, the box body as a whole is a closed structure, with a hatch snapped into place at the bottom opening on one side.

[0017] Furthermore, the box body is an overall closed structure, wherein a hatch is horizontally slidably connected to a bottom opening on one side, and the sliding track of the hatch is L-shaped.

[0018] Compared with the prior art, the beneficial effects of the utility model include:

[0019] 1. The utility model increases the hot pressing pressure of the lower pressing plate on the pole core thinning area by arranging a vacuum cavity and a spherical slider in the upper pressing plate, improves the hot pressing effect of the thinning area, and the vacuum environment can reduce the friction resistance of the spherical slider sliding left and right;

[0020] 2. The utility model provides a heat-conducting silicone pad, which is beneficial to its elastic deformation and improves the hot pressing effect of the pole core thinning area; in addition, a spring is added between the upper and lower pressure plates. Due to its good scalability, it can also improve the overall force uniformity during the hot pressing of the pole core, thereby improving the hot pressing effect of the pole core thinning area;

[0021] 3. The box of the utility model adopts a closed structure, which can prevent heat loss, and an insulation layer is provided inside the box to further play a role in heat preservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0023] Figure 1 This is a three-dimensional diagram of a pole core hot pressing device introduced in the utility model;

[0024] Figure 2 Based on Figure 1 A side view of the internal structure;

[0025] Figure 3 Based on Figure 2 AA section view.

[0026] Explanations in the figure: 1. Box body; 2. Hot pressing structure; 21. Upper pressure plate; 22. Spring; 23. Lower pressure plate; 24. Spherical slider; 25. First thermal conductive silicone pad; 26. Second thermal conductive silicone pad; 27. Telescopic cylinder; 3. Hatch door. DETAILED DESCRIPTION

[0027] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.

[0028] Example 1

[0029] See also Figure 1 This embodiment introduces a pole core hot pressing device, which is mainly composed of a box body 1 and a hot pressing structure 2. The box body 1 is made of steel plate as a whole and has a closed structure. In order to improve the thermal insulation effect, an insulation layer is arranged on the inner wall of the box body 1. The insulation layer is made of high temperature resistant material. While keeping warm, it is not affected by the hot pressing temperature. The insulation layer with a thickness of at least 10 mm is arranged, which will play a role of heat preservation during hot pressing, reduce heat dissipation, and the heat will not be exchanged with the external environment, thereby ensuring the effect of hot pressing.

[0030] As shown in Figure 3, in order to facilitate the placement of the pole core into the box body 1 and the removal of the pole core from the box body 1, a hatch 3 is hinged at the bottom opening on one side of the box body 1. The hatch 3 can be fixed to the box body 1 by buckles. The hatch 3 is fixed by buckles during hot pressing. After the hot pressing is completed, the hatch 3 can be opened by releasing the buckles. The hatch 3 is made of a door panel made of a transparent material, and there is no insulation layer in the inner area of ​​the hatch 3, so that the hatch 3 can be used as an observation window to view the situation inside the box body 1.

[0031] A groove is provided at the bottom of the inner part of the box 1, and a second heat-conducting silicone pad 26 is provided in the groove. The pole core is placed on the top of the second heat-conducting silicone pad 26, and the top of the pole core is located outside the groove. The hot pressing structure 2 is installed at the top of the inner part of the box 1, and the hot pressing structure 2 is mainly composed of a telescopic cylinder 27, an upper pressing plate 21, a spring 22, a lower pressing plate 23 and a spherical slider 24. The telescopic cylinder 27 adopts the existing structure, with the fixed end arranged at the top of the inner part of the box 1, and the movable end facing downward and rotatably connected with the upper pressing plate 21, that is, the upper pressing plate 21 has an installation notch at the top, which is used for rotatably connecting with the movable end of the telescopic cylinder 27, and in order to cooperate with the rotation, there is a gap between the movable end of the telescopic cylinder 27 and the installation notch to form a rotation gap. Since the thinning area of ​​the pole core is located in its width direction, the rotation direction of the upper pressing plate 21 is to cooperate with the width direction of the pole core, especially when multiple telescopic cylinders 27 are used, the rotation direction is to rotate around the length direction of the pole core.

[0032] The lower pressure plate 23 is at the bottom, and the upper pressure plate 21 is at the top. The upper and lower pressure plates 23 are made of steel plates, and the two are connected by evenly arranged springs 22. A first thermally conductive silicone pad 25 is arranged at the bottom of the lower pressure plate 23, and the thickness of the first thermally conductive silicone pad 25 is 1.5-5mm. During hot pressing, the thermally conductive silicone pad will adjust the deformation compression amount of each area according to the flatness of the pole core surface to ensure that it fits evenly with each area of ​​the pole core surface. A spring 22 device is added between the upper and lower pressure plates 23. During the hot pressing stage, the elasticity of the spring 22 can buffer the uneven stress between the steel plate and the thermally conductive silicone pad, and can improve the uniformity of the force on the pole core surface.

[0033] like Figure 2-3 As shown, a square vacuum groove is opened inside the upper pressing plate 21, and the spherical slider 24 is located in the vacuum groove and can slide in the vacuum groove. The spherical slider 24 can move according to the compression amount of the lower spring 22. The large compression amount of the spring 22 in the thinning area will cause the horizontal line on this side to be lower, and the spherical slider 24 will slide towards this area, thereby increasing the pressure in this area and improving the hot pressing effect of the thinning area. In addition, in a vacuum environment, the sliding resistance of the spherical slider can also be reduced.

[0034] It should be noted that the heating source is arranged in the lower pressing plate 23 and in the groove. The heating source can adopt an existing structure, such as a heating wire, or other existing heating structures, which will not be described in detail here. The telescopic cylinder 27 and related control components such as the heating source can be arranged at the top of the inner part of the box 1, or arranged outside the box 1, according to actual needs. The heating source conducts heat to the first thermal conductive silicone pad 25 and the second thermal conductive silicone pad 26. During hot pressing, the telescopic cylinder 27 drives the lower pressing plate 23 to move toward the groove direction, so that the pole core is located at the first thermal conductive silicone pad 25 and the second thermal conductive silicone pad 26 for hot pressing.

[0035] In addition, a ventilation structure, such as a vent pipe and a heat-insulating sleeve, may be provided on the hatch 3; the vent pipe is installed on the hatch 3, with one end extending into the box body 1 and the other end being located outside the box body 1 and being closed, and a vent hole is provided at the portion of the vent pipe located outside the hatch 3; the heat-insulating sleeve is threadedly connected to the portion of the vent pipe located outside the hatch 3, and in the initial state, the vent hole is located at the overlapping portion of the heat-insulating sleeve and the vent pipe and is closed by the heat-insulating sleeve. When it is necessary to dissipate heat from the inside of the box body 1, in order to avoid being burned by hot air by directly opening the hatch 3, the heat-insulating sleeve may be rotated first to connect the vent hole to the outside, thereby connecting the inside of the box body 1 to the outside, and discharging heat in advance. Other ventilation structures may also be used, not limited to the above structures.

[0036] In this embodiment, a thermally conductive silicone pad is attached to the lower surface of the lower pressure plate 23. Due to the elastic deformation of the silicone pad, the hot pressing effect of the pole core thinning area is improved. In addition, a spring 22 is added between the upper and lower pressure plates 23. Due to its good retractability, it can also improve the overall force uniformity during hot pressing of the pole core, thereby improving the hot pressing effect of the pole core thinning area. The spherical slider 24 will slide toward the thinning area, thereby increasing the pressure in the area and improving the hot pressing effect of the thinning area.

[0037] Example 2

[0038] This embodiment introduces a pole core hot pressing device, which is basically the same in structure as the pole core hot pressing device described in Example 1. The difference is that the box body 1 of this embodiment is a closed structure as a whole, and a hatch 3 is clamped at the bottom opening of one side. The clamping method is used to replace the hinged method, which is convenient for replacing the hatch 3. The hatch 3 is completely separated from the box body 1, which is convenient for taking and placing the pole core.

[0039] This embodiment has the same beneficial effects as Embodiment 1.

[0040] Example 3

[0041] This embodiment introduces a pole core hot pressing device, which has basically the same structure as the pole core hot pressing device introduced in Example 1. The difference is that the box body 1 of this embodiment is a closed structure as a whole, and a hatch 3 is horizontally slidably connected to the bottom opening on one side, and the sliding track of the hatch 3 is L-shaped. The sliding track of the hatch 3 preferably slides horizontally to the opening of the box body 1, and then slides into the opening to close the opening, which can be achieved by the hatch 3 and the concave and convex slide rails of the box body 1. This method can not only keep the hatch 3 away from the opening of the box body 1 when taking out the pole core, but also ensure that the hatch 3 does not separate from the box body 1.

[0042] This embodiment has the same beneficial effects as Embodiment 1.

[0043] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A core hot pressing device, characterized in that: It includes: The box body (1) has a groove at its inner bottom for accommodating the battery cell, and the depth of the groove is less than the height of the battery cell; A hot pressing structure (2) comprises an upper pressing plate (21), a spring (22), a lower pressing plate (23) and a spherical slider (24); the upper pressing plate (21) is flexibly connected to the top of the inner side of the box body (1), the lower pressing plate (23) is located below the upper pressing plate (21) and the two are connected via a plurality of evenly arranged springs (22), the bottom of the lower pressing plate (23) and the inside of the groove are flexibly arranged to fit the battery cell; a vacuum cavity is arranged inside the upper pressing plate (21), the spherical slider (24) is located in the vacuum cavity and slides according to the change in the compression amount of the spring (22) to increase the downward pressure of the area where the lower pressing plate (23) is connected to the spring (22) with a large compression amount.

2. The core hot pressing device according to claim 1, characterized in that: A first thermally conductive silicone pad (25) is bonded to the bottom of the lower pressing plate (23), a second thermally conductive silicone pad (26) is bonded to the bottom of the groove, and the battery cell is placed on top of the second thermally conductive silicone pad (26).

3. The core hot pressing device according to claim 2, characterized in that: The thickness of the first thermally conductive silicone pad (25) is 1.5-5 mm.

4. The core hot pressing device according to claim 1, characterized in that: A telescopic cylinder (27) is arranged at the top end of the inner part of the box body (1). The telescopic cylinder (27) is arranged longitudinally and the movable end is rotatably connected to the lower pressure plate (23). A rotation gap is provided at the connection between the lower pressure plate (23) and the movable end of the telescopic cylinder (27) to cooperate with the spherical slider (24) to slide in the vacuum cavity.

5. The core hot pressing device according to claim 1, characterized in that: A heating guide wire is embedded inside the lower pressing plate (23) and the groove.

6. The core hot pressing device according to claim 1, characterized in that: The box body (1) is a closed structure as a whole, and a door (3) is hingedly connected to a bottom opening on one side.

7. The core hot pressing device according to claim 6, characterized in that: The inner wall of the box body (1) is bonded with a heat-insulating layer, and the thickness of the heat-insulating layer is at least 10 mm.

8. The core hot pressing device according to claim 7, characterized in that: The hatch door (3) is made of a door panel made of a transparent material, and the inner area of ​​the hatch door (3) has no heat-insulating layer, so that the hatch door (3) is used as an observation window.

9. The core hot pressing device according to claim 1, characterized in that: The box body (1) is an overall closed structure, with a hatch (3) being snap-fitted to a bottom opening on one side.

10. The core hot pressing device according to claim 1, characterized in that: The box body (1) is an overall closed structure, wherein a hatch door (3) is horizontally slidably connected to a bottom opening on one side, and the sliding track of the hatch door (3) is L-shaped.

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