A single-folded-edge battery cell fixed UV dispensing mold and dispensing process

Abstract

The present invention discloses a single-folded edge battery cell fixed UV dispensing mold and a dispensing process, belonging to the technical field of lithium battery production processes. The dispensing mold includes a parallel mold, a side mold, and a hole plug. The parallel mold is provided with a mold cavity and a dispensing hole, and the dispensing hole is communicated with the mold cavity. The hole plug is installed at the dispensing hole, and a channel that enables the glue to pass unidirectionally is opened on the hole plug. At least two dispensing holes are provided on the parallel mold. The hole plug has elasticity, and a glue injection hole and a glue blocking hole are opened on the hole plug. A channel is provided between the glue injection hole and the glue blocking hole, and the edge of the channel is a convex portion. The convex portion squeezes and closes the channel when not under the pressure on the side of the glue injection hole. By setting a hole plug that enables the UV glue to pass unidirectionally, the present invention solves the problems of incomplete glue line shape and inconsistent dimensions caused by glue liquid backflow, and improves the working efficiency of glue injection and curing.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production processes. Specifically, it mainly relates to a single-folded edge battery core fixed UV dispensing mold and a dispensing process. Background Art

[0002] The bare battery core of a lithium battery needs to be encapsulated with an aluminum-plastic film. When encapsulating the single-folded edge aluminum-plastic film, it is necessary to dispense glue at the edge of the aluminum-plastic film so that different edges of the aluminum-plastic film can be fused together. The single-folded edge UV-dispensed battery core has the advantage of having room for improving the energy density compared to the double-folded edge battery core.

[0003] Currently, the UV dispensing processes mainly include the covering type and the spraying type. In the covering type, the UV glue is filled in a C-shaped covering type dispensing valve to cover the edge of the aluminum-plastic film seal. In the spraying type, multiple spraying nozzles on the upper and lower sides spray glue, so that the UV glue liquids on the upper and lower edges of the aluminum-plastic film are fused to cover the edge of the aluminum-plastic film seal. The method of forming a line by dots to achieve the covering of the edge of the aluminum-plastic film with UV glue determines its dimensional instability and cannot meet the requirements of the dimensional consistency of UV dispensing. Therefore, the covering type dispensing is widely used in the industry.

[0004] For example, the Chinese patent document with the application number 2018112635102 discloses a UV dispensing device and its dispensing process. Its main technical solutions include:... There is a glue cavity in the dispensing head, and a dispensing port is arranged outside the glue cavity; a first glue path and a second glue path are respectively arranged in the dispensing head along the vertical direction. Among them, the first glue path is communicated with the upper part of the glue cavity, and the second glue path is communicated with the lower part of the glue cavity. The UV glue is respectively introduced into the glue cavity through the first glue path and the second glue path; during dispensing, the edge of the aluminum-plastic film of the battery core is inserted into the glue cavity through the dispensing port, and the UV glue in the glue cavity is immersed on the outer end face and the upper and lower end faces of the edge of the aluminum-plastic film. When the dispensing head is controlled to move linearly through the X-axis driving component and the Y-axis driving component, UV glue is dispensed on the four edges of the aluminum-plastic film, and when passing through the transition angle, it is controlled by the rotating component to perform dispensing on the transition angle; when passing through the transition arc by simultaneously controlling the X-axis driving component, the Y-axis driving component and the rotating component, dispensing is performed on the transition arc.

[0005] The existing covering type dispensing devices such as the above have the following defects in use: Since there are usually multiple glue paths in the dispensing head, such as the first glue path and the second glue path in the above dispensing device, when dispensing, multiple glue paths inject glue simultaneously. After the pressurized injection is completed and the injection pressure is unloaded, the glue liquid in the glue cavity has not yet solidified, and the internal residual pressure will cause the glue liquid to flow into the first glue path or the second glue path, resulting in an incomplete glue line and random dimensions after dispensing, unable to meet the requirements of the dimensional consistency of UV dispensing. Moreover, due to the flow of the glue liquid, the dispensing and curing time will be prolonged, and the dispensing effect is not ideal.

[0006] In view of this, it is necessary to improve the existing UV dispensing technology for lithium batteries. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention provides a single-folded edge cell fixed UV dispensing mold and a dispensing process to solve the problems of incomplete glue line shape and inconsistent dimensions caused by glue liquid reflux, and improve the working efficiency of glue injection and curing.

[0008] A single-folded edge cell fixed UV dispensing mold disclosed by the present invention includes a parallel mold, a side mold and a hole plug; the parallel mold is provided with a mold cavity and a dispensing hole, and the dispensing hole is communicated with the mold cavity; the hole plug is installed at the dispensing hole, and a channel that can allow the UV glue to pass unidirectionally is opened on the hole plug.

[0009] Preferably, at least two dispensing holes are provided on the parallel mold.

[0010] Preferably, the hole plug is elastic, and a glue injection hole and a glue blocking hole are opened on the hole plug. A channel is provided between the glue injection hole and the glue blocking hole, and the edge of the channel is a convex part. The convex part squeezes and closes the channel when not under the pressure on the side of the glue injection hole.

[0011] Preferably, the dispensing hole is a conical hole, the hole plug is a frustum-shaped structure, the glue injection hole is arranged on the large end face of the hole plug, and the glue blocking hole is arranged on the small end face of the hole plug.

[0012] Preferably, the parallel mold is provided with a slit, and the slit communicates the mold cavity with the outside of the parallel mold.

[0013] Preferably, two parallel molds are provided, including an upper mold and a lower mold used in combination. Glue dispensing grooves are provided on both the upper mold and the lower mold. When the upper mold and the lower mold are combined, the two glue dispensing grooves form the mold cavity.

[0014] Preferably, both the upper mold and the lower mold are provided with hole grooves. When the upper mold and the lower mold are combined, the two hole grooves corresponding up and down cooperate to form the dispensing hole.

[0015] Preferably, clamping surfaces are provided on both the upper mold and the lower mold. When the upper mold and the lower mold are combined, the slit is formed between the two clamping surfaces.

[0016] Preferably, a circular groove is provided on the side mold, and the circular groove is correspondingly connected to the mold cavity.

[0017] The present invention also provides a single-folded edge cell fixed UV dispensing process, using any one of the above dispensing molds, including the following steps:

[0018] Step 1: Combine the parallel mold and the side mold at the edge of the aluminum-plastic film to be dispensed, so that the edge of the aluminum-plastic film enters the mold cavity to form a closed cavity.

[0019] Step 2: Install a hole plug in each dispensing hole.

[0020] Step 3: Inject UV glue with pressure into each dispensing hole, so that the UV glue passes through the hole plug and enters the mold cavity. Stop injecting glue after the closed cavity between the parallel mold, the side mold and the aluminum-plastic film is filled with UV glue.

[0021] Step 4: Cure the UV glue by light.

[0022] Step 5: Demold, separate the parallel mold and the side mold from the aluminum-plastic film to obtain an aluminum-plastic film with UV glue in a cured state at the edge.

[0023] The beneficial effects of this application are as follows:

[0024] By setting a hole plug with the function of enabling the one-way passage of UV glue in the dispensing hole, during glue injection, only when there is pressurized UV glue pushing on one side of the dispensing hole, the convex part will open the channel, enabling the UV glue liquid to pass through the hole plug and enter the mold cavity. And when the mold cavity is filled with UV glue and the pressure of the glue liquid is unloaded, under the push of the residual pressure of the UV glue inside the mold cavity, the extrusion of the convex part will be tighter, ensuring that the hole plug is in a closed state, thus avoiding the overflow of UV glue in the mold cavity and solving the problems of incomplete glue line shape and inconsistent dimensions caused by glue liquid backflow. Thereby ensuring the integrity of the shape and the consistency of the dimensions of the UV glue in the mold cavity and the round groove, and improving the working efficiency of glue injection and curing. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of this application and form a part of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0026] Figure 1 is a schematic diagram of the use state of the dispensing mold of the present invention;

[0027] Figure 2 is an exploded view of the dispensing mold of the present invention Figure 1 , used to show the round groove of the side mold;

[0028] Figure 3 is an exploded view of the dispensing mold of the present invention Figure 2 , used to show the clamping surface, hole groove and transition groove;

[0029] Figure 4 is a cross-sectional view taken along the axis of the dispensing hole in the dispensing mold of the present invention, used to show the mold cavity and the hole plug;

[0030] Figure 5 is Figure 4 A partial enlarged view at A in the figure, used to show the structure of the hole plug;

[0031] Figure 6 is a schematic diagram after the dispensing mold of the present invention is demolded.

[0032] Explanation of reference numerals: 01, aluminum-plastic film; 1, parallel mold; 101, upper mold; 102, lower mold; 11, mold cavity; 110, dispensing groove; 12, slit; 120, clamping surface; 13, dispensing hole; 130, hole groove; 2, side mold; 201, upper side mold; 202, lower side mold; 21, circular groove; 210, transition groove; 3, hole plug; 31, injection hole; 32, glue-blocking hole; 33, convex part. Detailed implementation manners

[0033] The following will disclose multiple implementation manners of the present invention with diagrams. For the sake of clear description, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present invention. That is to say, in some implementation manners of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some conventional structures and components will be shown in a simple schematic manner in the diagrams.

[0034] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the drawings. If this specific posture changes, then the directional indications will also change accordingly.

[0035] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0036] In order to further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

[0037] Embodiment 1

[0038] Reference Figures 1-6 , a single-folded edge cell fixed UV dispensing mold disclosed by the present invention, includes a parallel mold 1, a side mold 2 and a hole plug 3. Among them, two parallel molds 1 are symmetrically arranged up and down in a mirror image, including an upper mold 101 and a lower mold 102. Both the upper mold 101 and the lower mold 102 are in a long strip block structure. Dispensing grooves 110 are arranged on both the upper mold 101 and the lower mold 102. The dispensing groove 110 is a groove with a circular arc cross-section. The opening of the dispensing groove 110 on the upper mold 101 faces downward, and the opening of the dispensing groove 110 on the lower mold 102 faces upward. When the two parallel molds 1 are combined with each other, the upper and lower dispensing grooves 110 cooperate with each other to form a long strip-shaped cavity 11 with a circular cross-section.

[0039] Reference Figures 1-6 , clamping surfaces 120 are arranged on both the upper mold 101 and the lower mold 102. The clamping surface 120 is a plane, and the clamping surface 120 extends to the side wall of the dispensing groove 110. The clamping surface 120 on the upper mold 101 is arranged downward, and the clamping surface 120 on the lower mold 102 is arranged upward. When the two parallel molds 1 are combined with each other, the two clamping surfaces 120 are parallel to each other and a slit 12 for the aluminum-plastic film 01 to pass through is formed between them. The slit 12 connects the cavity 11 with the outside of the parallel mold 1.

[0040] Reference Figures 1-6 , a number of hole grooves 130 are arranged on both the upper mold 101 and the lower mold 102. In this embodiment, two hole grooves 130 are opened on each parallel mold 1. The hole groove 130 is a groove with an arc cross-section. One end of the hole groove 130 extends to the side wall of the parallel mold 1, and the other end extends to the side wall of the dispensing groove 110. The radius of the arc formed by the hole groove 130 on the side wall of the dispensing groove 110 is smaller than the radius of the arc formed by the hole groove 130 on the side wall of the parallel mold 1. The hole groove 130 is smoothly transitioned as a whole to form a semi-conical structure; the opening of the hole groove 130 on the upper mold 101 faces downward, and the opening of the hole groove 130 on the lower mold 102 faces upward. When the two parallel molds 1 are combined with each other, each hole groove 130 has a corresponding other hole groove 130 to cooperate with it, and the upper and lower corresponding hole grooves 130 form a conical dispensing hole 13.

[0041] Reference Figures 1-6, there are two sets of side molds 2 symmetrically arranged on the left and right. One set of side molds 2 is arranged at one end of the parallel mold 1, and the other set of side molds 2 is arranged at the other end of the parallel mold 1. In addition, two side molds 2 are symmetrically arranged up and down in each group, including an upper side mold 201 and a lower side mold 202. Both the upper side mold 201 and the lower side mold 202 are rectangular block structures. The shape and size of the end face of the upper side mold 201 are the same as those of the upper mold 101, and the shape and size of the end face of the lower side mold 202 are the same as those of the lower mold 102. An arc-shaped transition groove 210 is provided at the lower edge of the surface of the upper side mold 201 close to the upper mold 101 and at the upper edge of the surface of the lower side mold 202 close to the lower mold 102. When the two side molds 2 in the same group are combined up and down, the two transition grooves 210 correspond and cooperate with each other to form a hemispherical circular groove 21. When the upper mold 101, the lower mold 102 and the side mold 2 are combined with each other, the circular groove 21 is correspondingly connected to the end of the cavity 11 of the parallel mold 1 to form a complete cavity structure for dispensing glue, and the above cavity structure is communicated with the outside through a slit 12.

[0042] Referring to Figures 1-6 , when the upper mold 101 and the lower mold 102 are combined with each other, a hole plug 3 is arranged in each dispensing hole 13. The hole plug 3 has elasticity. In this embodiment, the hole plug 3 is made of rubber. The hole plug 3 is a frustum-shaped structure that matches the shape of the dispensing hole 13. A glue injection hole 31 is provided on the large end face of the hole plug 3, and a glue blocking hole 32 is provided on the small end face. Among them, both the glue injection hole 31 and the glue blocking hole 32 are arc-shaped concave holes. A channel is provided between the glue injection hole 31 and the glue blocking hole 32 to connect them. The edge of the channel is a convex portion 33. When not under pressure, the edge of the convex portion 33 is squeezed towards the axis direction of the hole plug 3 under the action of elasticity, thereby closing the channel between the glue injection hole 31 and the glue blocking hole 32. When there is pressurized UV glue pushing on one side of the glue injection hole 31, the convex portion 33 opens the channel, enabling the glue to enter the glue blocking hole 32 from the glue injection hole 31, and then enter the cavity 11 through the dispensing hole 13. When the pressure of the glue is unloaded, under the pressure of the UV glue inside the cavity 11, the extrusion of the convex portion 33 will be tighter, avoiding the overflow of the UV glue in the cavity 11, thereby ensuring the integrity of the shape and the consistency of the size of the UV glue in the cavity 11.

[0043] In addition, the parallel mold 1 and the side mold 2 in this embodiment are both made of transparent materials, which can allow UV light to pass through. After the glue injection is completed, UV light curing can be carried out in the state of not being demolded.

[0044] Embodiment 2

[0045] The present invention discloses a single-folded edge battery cell fixing type UV dispensing process, which uses the dispensing mold in Embodiment 1. The main technical solutions include the following steps:

[0046] Step 1: Combine two parallel molds 1 and two side molds 2 at the edge of the aluminum-plastic film 01 to be dispensed with glue, so that the edge of the aluminum-plastic film 01 passes through the slit 12 and enters the mold cavity 11, and press the two clamping surfaces 120 on the aluminum-plastic film 01, so that the mold cavity 11 and the circular grooves 21 at both ends thereof form a closed cavity;

[0047] Step 2: Install a hole plug 3 in each dispensing hole 13, with the large end of the hole plug 3 facing outward and the small end facing inward to close the dispensing hole 13;

[0048] Step 3: Inject pressurized UV glue into each dispensing hole 13, so that the UV glue passes through the hole plug 3 and enters the mold cavity 11. Stop injecting glue after the cavity formed by the mold cavity 11 and the circular groove 21 is filled with UV glue;

[0049] Step 4: Use UV light to irradiate the parallel mold 1 and the side mold 2 until the UV glue in the mold cavity 11 and the circular groove 21 cures and stops flowing;

[0050] Step 5: Demold, separate the parallel mold 1 and the side mold 2 from the aluminum-plastic film 01 to obtain the aluminum-plastic film 01 with cured UV glue at the edge.

[0051] The implementation principle and beneficial effects of the present invention are that by arranging a hole plug 3 with the function of enabling the one-way passage of UV glue in the glue injection hole 31, during glue injection, only when there is pressurized UV glue pushing on one side of the glue injection hole 31, the convex part 33 will open the channel, enabling the UV glue liquid to pass through the hole plug 3 and enter the mold cavity 11. When the mold cavity 11 is filled with UV glue and the pressure of the glue liquid is unloaded, under the push of the residual pressure of the UV glue inside the mold cavity 11, the extrusion of the convex part 33 will be tighter, ensuring that the hole plug 3 is in a closed state, thus avoiding the overflow of the UV glue in the mold cavity 11 and solving the problems of incomplete glue line shape and inconsistent dimensions caused by glue liquid backflow. Thereby, the integrity of the shape and the consistency of the dimensions of the UV glue in the mold cavity 11 and the circular groove 21 are ensured, and the working efficiency of glue injection and curing is improved.

[0052] The above are only the implementation modes of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A single-folded edge battery cell fixed UV dispensing mold, characterized in that, it includes a parallel mold (1), a side mold (2) and a hole plug (3); the parallel mold (1) is provided with a mold cavity (11) and a dispensing hole (13), and the dispensing hole (13) is communicated with the mold cavity (11); the hole plug (3) is installed at the dispensing hole (13), and a channel that allows the UV glue to pass unidirectionally is opened on the hole plug (3); at least two of the dispensing holes (13) are provided on the parallel mold (1); the hole plug (3) is elastic, and a glue injection hole (31) and a glue blocking hole (32) are opened on the hole plug (3), a channel is provided between the glue injection hole (31) and the glue blocking hole (32), and the edge of the channel is a convex part (33), and the convex part (33) squeezes and closes the channel when not under the pressure on the side of the glue injection hole (31); the dispensing hole (13) is a conical hole, the hole plug (3) is a frustum-shaped structure, the glue injection hole (31) is arranged on the large end face of the hole plug (3), and the glue blocking hole (32) is arranged on the small end face of the hole plug (3).

2. The single-folded edge battery cell fixed UV dispensing mold according to claim 1, characterized in that, the parallel mold (1) is provided with a slit (12), and the slit (12) communicates the mold cavity (11) with the outside of the parallel mold (1).

3. The single-folded edge battery cell fixed UV dispensing mold according to claim 2, characterized in that, two parallel molds (1) are provided, including an upper mold (101) and a lower mold (102) used in combination, and glue dispensing grooves (110) are provided on both the upper mold (101) and the lower mold (102), and when the upper mold (101) and the lower mold (102) are combined, the two glue dispensing grooves (110) form the mold cavity (11).

4. The single-folded edge battery cell fixed UV dispensing mold according to claim 3, characterized in that, both the upper mold (101) and the lower mold (102) are provided with hole grooves (130), and when the upper mold (101) and the lower mold (102) are combined, the two hole grooves (130) corresponding up and down cooperate to form the dispensing hole (13).

5. The single-folded edge battery cell fixed UV dispensing mold according to claim 4, characterized in that, both the upper mold (101) and the lower mold (102) are provided with clamping surfaces (120), and when the upper mold (101) and the lower mold (102) are combined, the slit (12) is formed between the two clamping surfaces (120).

6. The single-folded edge battery cell fixed UV dispensing mold according to claim 1, characterized in that, a circular groove (21) is provided on the side mold (2), and the circular groove (21) is correspondingly connected to the mold cavity (11).

7. A single-folded edge battery cell fixed UV dispensing process, characterized in that, using the dispensing mold according to any one of claims 1-6, including the following steps: Step 1: Combine the parallel mold (1) and the side mold (2) at the edge of the aluminum-plastic film (01) to be dispensed with glue, so that the edge of the aluminum-plastic film (01) enters the mold cavity (11) to form a closed cavity; Step 2: Install a hole plug (3) in each dispensing hole (13); Step 3: Inject UV glue with pressure into each dispensing hole (13), so that the UV glue passes through the hole plug (3) and enters the mold cavity (11). Stop injecting glue after the closed cavity between the parallel mold (1), the side mold (2) and the aluminum-plastic film (01) is filled with UV glue; Step 4: Carry out photocuring on the UV glue; Step 5: Demold, separate the parallel mold (1) and the side mold (2) from the aluminum-plastic film (01) to obtain the aluminum-plastic film (01) with UV glue in a cured state at the edge.

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