Thermal forming mold forming process for convex hull of insulating spacer for battery cell

Abstract

The invention discloses a thermal forming die forming process for a convex hull of an insulating spacer for a battery cell, which comprises the following steps of: compounding a main material PC (Polycarbonate) and a double-faced adhesive tape, inserting a heating rod into heating through holes in a preheating template and a convex hull heating and punching template, and when a composite material reaches the lower part of the convex hull heating and punching template, carrying out thermal forming on the convex hull heating and punching template; and at the moment, the upper die plate is subjected to downward die assembly again, the convex hull heating and punching die plate makes contact with the lower die plate, the convex hull heating and punching die plate is extruded to move upwards, the convex hull punch punches the composite material into a bottom spring groove in the lower die plate, and the convex hull appearance is formed. According to the manufacturing technology, the insulation spacer with the convex hull is effectively manufactured, heat treatment is combined with a hardware mold, needed labor is reduced, bad products are reduced, and the insulation spacer can be used for batch manufacturing. According to the technology, a main material PC and a double-faced adhesive tape are compounded firstly, then punching of the shape of the convex hull and subsequent punching of a round hole in the convex hull are conducted on a composite material, and the production efficiency is improved. And the yield of products is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of insulation sheet production, in particular to a convex heat forming die forming process for insulation gasket of battery cell. BACKGROUND

[0002] The battery cell insulation gasket is a thin sheet of insulating material placed in a specific part of the battery cell. Its core function is to prevent short circuit. If there is no insulation gasket, the battery cells or the battery cells and the module structure are in direct contact, which may cause short circuit, leading to serious safety accidents such as heating, fire and even explosion. In the assembly process, the battery cell tabs may be in contact with the shell due to bumps, burrs, etc. The insulation gasket can play a protective role. Today's insulation gasket is often composed of two parts, one part is the main material PC, that is, the engineering plastic of polycarbonate base material, and the other part is the combination of double-sided adhesive.

[0003] However, the prior art still has great deficiencies, such as: the traditional convex production method of the insulation gasket is to first suck the convex shape on the original material PC, and then paste the original material double-sided adhesive on the back of the PC convex and trim the excess waste of the double-sided adhesive. Due to the reasons of many processes and difficult waste disposal, this method is time-consuming, low in efficiency, and does not have mass production, and because of trimming the waste, the double-sided adhesive is easily left on the edge area of the convex groove, resulting in a high rate of defective products. SUMMARY

[0004] The purpose of the present application is to provide a convex heat forming die forming process for insulation gasket of battery cell to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: A convex heat forming die forming process for insulation gasket of battery cell, comprising the following steps: S1: composite the main material PC and the double-sided adhesive to form a composite material, and place the composite material on one side of the machine and install it in the feeding mechanism; S2: insert the heating rod into the heating through hole on the preheating template and the convex heating punch template, increase the temperature of the preheating template and the convex heating punch template, and heat the composite material when the upper template of the machine is downwardly combined with the film; S3: reset the upper template, and continue to advance the composite material under the action of the feeding mechanism, when the composite material reaches below the convex heating punch template, the upper template is downwardly combined with the film again, the convex heating punch template contacts the lower template, the convex punch head is exposed to the composite material for punching under the action of the top block between the convex punch head and the upper template, and the composite material is punched into the bottom spring groove on the lower template to form a convex shape in the process of punching; S4: The upper die plate is reset again, and the composite material continues to advance under the action of the feeding mechanism, when the convex shape moves to the convex avoidance groove position, at this time, the upper die plate is reset again to close the film, and the convex shape punched is entered into the convex avoidance groove, the special-shaped punch punches other positions of the composite material, and other inner holes are punched out, and the convex round hole punch punches the inside of the convex shape, and a convex internal round hole is punched out.

[0006] Preferably, the heating rod is controlled by a heating box, and the temperature of the heating rod is controlled at 45-50 DEG C.

[0007] Preferably, the bottom spring groove is internally provided with an auxiliary spring, and a metal sheet is arranged above the auxiliary spring and is slidingly clamped in the bottom spring groove.

[0008] Preferably, a plurality of blanking through holes and convex round hole blanking through grooves are formed in the lower die plate.

[0009] Preferably, the main material PC and the double-sided adhesive tape are compounded by a laminating machine.

[0010] Preferably, the head edge of the convex punch is arc-shaped.

[0011] Compared with the prior art, the beneficial effects of the present application are: 1. The insulating gasket with convex type is effectively manufactured, heat treatment and hardware mold are combined, compared with the previous process, the production speed and efficiency are improved, the required labor is reduced, the product defect is reduced, and the process can be used for batch manufacturing; 2. The main material PC and the double-sided adhesive tape are compounded, then preheated by a preheating die, then the convex shape of the composite material is punched, and the subsequent punching of the internal round hole of the convex shape is punched, the product yield is effectively improved, and the punching of other positions can be performed at the same time, and the production efficiency is improved; 3. The convex avoidance groove is arranged on the lower die plate, so that the subsequent convex shape is not extruded and deformed during the punching of other positions and the internal round hole of the convex shape. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic view of the heating plate and the heating box of the present application; Figure 2 It is a schematic view of the upper die plate and the lower die plate of the present application; Figure 3 It is a side view of the upper die plate and the lower die plate of the present application; Figure 4 It is a composite material flow chart of the present application; Figure 5 It is a process flow chart of the present application.

[0013] In the figure: 1, preheating template; 2, heating through hole; 3, heating rod; 4, heating box; 5, convex heat forming die template; 6, bottom spring groove; 7, convex round hole punch; 8, convex position avoidance groove; 9, special-shaped punch; 10, convex punch; 11, blanking through hole; 12, upper die plate; 13, lower die plate; 14, ejector; 15, auxiliary spring; 16, metal sheet; 17, convex round hole blanking through slot. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0015] Please refer to Figures 1 to 5 The present application provides a technical solution: A forming process of an insulating gasket convex thermoforming die for battery cells, comprising the following steps: S1: The main material PC and the double-sided adhesive are compounded to form a composite material, which is placed on one side of the machine and installed in the feeding mechanism. The main material PC and the double-sided adhesive are compounded by a laminating machine. In this embodiment, the main material PC is an engineering plastic of polycarbonate base material, and the double-sided adhesive is an acrylate pressure-sensitive adhesive. Before stamping, the main material PC and the double-sided adhesive are compounded by a laminating machine. The difference from the existing process is that the existing technology first sucks out the convex shape on the main material PC, then laminates the double-sided adhesive, and then trims the excess waste. The whole process consumes a lot of manpower and has a low trimming yield. Because of the process problem, it is difficult to realize batch production and manufacturing. In this process, the main material PC and the double-sided adhesive are laminated first, and the lamination degree is high, which is convenient for subsequent batch production. This process is completely separated from the process of forming the convex shape, which is more suitable for batch production and actual production needs.

[0016] When the main material PC and the double-sided adhesive are compounded to form a composite material, the composite material is placed on the left side of the machine and installed in the feeding mechanism. The feeding mechanism is composed of upper and lower feeding rollers, which can realize the feeding of the composite material from left to right. The feeding mechanism is a device familiar to those skilled in the art, and is controlled by a control system between the machine to stop the composite material when the mold is closed. When the upper die plate 12 and the lower die plate 13 are separated, the composite material is driven to continue to advance.

[0017] S2: Insert the heating rod 3 into the heating hole 2 on the preheating template 1 and the convex heating die template 5, increase the temperature of the preheating template 1 and the convex heating die template 5, heat the composite material when the upper die 12 is closed, control the temperature of the heating rod 3 by the heating box 4, control the temperature of the heating rod 3 at 45-50℃, in this embodiment, the heating rod 3 and the heating box 4 are electrically connected by wires, control the temperature of the heating rod 3 by the heating box, so that the temperature of the heating rod 3 is maintained between 45-50℃, the operator places the heating rod 3 inside the heating hole 2 on the preheating template 1 and the convex heating die template 5, heats the preheating template 1 and the convex heating die template 5 by the heating rod 3, when the preheating template 1 and the convex heating die template 5 reach the required temperature, the subsequent stamping work can be carried out, the heating rod 3 only needs to be placed inside the heating hole 2 without being taken out, which is convenient for maintaining the temperature of the preheating template 1 and the convex heating die template 5.

[0018] During the whole process, when the composite material moves under the action of the feeding mechanism to the lower side of the preheating template 1, the upper die 12 is closed at this time, the preheating template 1 preheats the composite material, which is convenient for the convex shape stamping of the next process.

[0019] S3: The upper die 12 is reset, the composite material continues to advance under the action of the feeding mechanism, when the composite material reaches the lower side of the convex heating die template 5, the upper die 12 is closed again at this time, the convex heating die template 5 contacts the lower die 13, the convex heating die template 5 is extruded and moves up at this time, the convex punch 10 and the upper die 12 are provided with a top block 14, the convex punch 10 is exposed under the action of the top block 14 to stamp the composite material, in the process of stamping, the convex punch 10 stamps the composite material into the bottom spring groove 6 on the lower die 13 to form a convex shape, the head edge of the convex punch 10 is arc-shaped, the edge of the convex punch 10 is arc-shaped with a flat surface in the middle, the convex heating die template 5 is also heated, when the composite material heated by the preheating template 1 reaches the lower side of the convex heating die template 5, the upper die 12 is closed again at this time, the convex heating die template 5 and the upper die 12 in this embodiment are provided with a spring, in the process of closing the upper die 12, the convex heating die template 5 first contacts the lower die 13 and is extruded, at this time the convex heating die template 5 moves up, then the convex punch 10 extends out under the action of the top block 14 to stamp the composite material.

[0020] In this process, the convex heating die template 5 always presses the composite material, on the one hand, it ensures that the temperature of the composite material does not decrease, and also makes the stamping process stable, the composite material is stamped into the bottom spring groove 6 by the convex punch 10 to form a convex shape.

[0021] The convex shape is stamped in the bottom spring groove 6, the bottom spring groove 6 is internally provided with an auxiliary spring 15, the auxiliary spring 15 is provided with a metal sheet 16 above, the metal sheet 16 is slidingly clamped in the bottom spring groove 6, by setting the auxiliary spring in the bottom spring groove 6, a upward force can be provided for the composite material, to ensure that the part of the composite material is not too loose during stamping, to prevent the material from wrinkling, and the metal sheet 16 is provided above the auxiliary spring 15 to avoid the material of the convex shape part from directly contacting the auxiliary spring 15 during stamping, which can also ensure that the convex shape does not wrinkle.

[0022] S4: The upper die plate 12 is reset again, and the composite material continues to advance under the action of the feeding mechanism, when the convex shape moves to the convex avoidance groove 8 position, at this time the upper die plate 12 is closed again, the convex shape is formed by stamping into the convex avoidance groove 8, the special-shaped punch 9 punches other positions of the composite material, and other inner holes are stamped out, at the same time, the convex round hole punch 7 punches the inside of the convex shape, and the convex inner hole is punched out, the lower die plate 13 is provided with a plurality of blanking through holes 11 and convex round hole blanking grooves 17.

[0023] After the convex shape is stamped, the composite material continues to move to the right, and subsequent stamping of other ordinary inner holes and punching of the inside of the convex shape is required, because the entire material production process not only needs to stamp the convex shape of the composite material, but also needs to punch other parts of the composite material, and needs to punch the inside of the convex shape, the process combines the punching of the inside of the convex shape and the ordinary punching of other parts into one step to improve production efficiency, the ordinary punching and the punching of the inside of the convex shape are realized at the same time in the third stage, and the special-shaped punch 9 performs punching and has the same principle as the convex punch 10.

[0024] If the ordinary punching and the punching of the inside of the convex shape are completed at the same time, a problem may occur that the upper die plate 12 and the lower die plate 13 may crush other convex shapes during the closing process, therefore, the process is provided with the convex avoidance groove 8 on the lower die plate 13 to ensure that the remaining convex shape will not be crushed during ordinary punching and punching of the inside of the convex shape.

[0025] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An insulating gasket bulge thermoforming die forming process for an electric core, characterized by, It comprises the following steps: S1: the main material PC and double-sided adhesive are compounded to form a composite material, the composite material is placed on one side of the machine and installed in the feeding mechanism; S2: the heating rod (3) is inserted into the heating hole (2) on the preheating template (1) and the convex heating die template (5), the temperature of the preheating template (1) and the convex heating die template (5) is increased, and the preheating template (1) heats the composite material when the upper die template (12) on the machine is closed downward; S3: the upper die template (12) is reset, the composite material continues to advance under the action of the feeding mechanism, when the composite material reaches below the convex heating die template (5), the upper die template (12) is closed downward again, the convex heating die template (5) and the lower die template (13) are in contact, the convex punch (10) and the upper die template (12) are provided with a top block (14), the convex punch (10) is exposed to the composite material under the action of the top block (14), and the convex punch (10) is pressed to the bottom spring groove (6) on the lower die template (13) in the process of punching, forming a convex shape; S4: the upper die template (12) is reset again, the composite material continues to advance under the action of the feeding mechanism, when the convex shape moves to the convex avoiding groove (8) position, the upper die template (12) is closed downward again, the punched convex shape enters the convex avoiding groove (8), the special-shaped punch (9) punches other positions of the composite material, and other inner holes are punched out, and the convex round hole punch (7) punches the inside of the convex shape.

2. The process of claim 1, wherein: The heating rod (3) is controlled by the heating box (4), and the temperature of the heating rod (3) is controlled at 45-50℃.

3. The process of claim 2, wherein the process further comprises: The bottom spring groove (6) is provided with an auxiliary spring (15), and the auxiliary spring (15) is provided with a metal sheet (16) above.

4. The process of claim 3, wherein the process further comprises: The lower die template (13) is provided with a plurality of blanking through holes (11) and convex round hole blanking through grooves (17).

5. The process of claim 1, wherein: The main material PC and double-sided adhesive are compounded by a laminating machine.

6. The process of claim 1, wherein: The head edge of the convex punch (10) is arc-shaped.

Images