A process for forming an insulating gasket for an electric cell by male hot forming

Abstract

The application discloses a kind of insulating gasket convex heat forming die forming process for battery cell, comprising the following steps, main material PC and double-sided adhesive are compounded, heating rod is inserted into the heating hole inside on preheating template and convex heating punch template, when composite material reaches the lower side of convex heating punch template, at this time, the upper template is again downwardly combined film, convex heating punch template and lower template contact, at this time, convex heating punch template is extruded and moves up, and the convex punch head is punched into the bottom spring groove inside on lower template, to form convex shape.The application effectively produces insulating gasket with convex type, uses heat treatment and hardware mold combination, reduces the required labor, reduces product failure, and can be used for batch production, the process first compounds main material PC and double-sided adhesive, then punches the convex shape of composite material, and the subsequent punching of round hole in the convex interior, effectively improves the yield of product.

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 an insulation gasket for a 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 circuits. If there is no insulation gasket, the battery cells or the battery cells directly contact the module structure, which may cause short circuits, leading to heating, fire, and even explosion and other serious safety accidents. During assembly, the battery cell tabs may come into contact with the shell due to bumps, burrs, etc. The insulation gasket can provide protection. Today's insulation gaskets are often composed of two parts, one part is the main material PC, which is an engineering plastic based on polycarbonate base material, and the other part is a double-sided adhesive combination.

[0003] However, the prior art still has great deficiencies, such as: the traditional convexity making method of the insulation gasket is to first vacuum form a convex shape on the original PC material, then bond the original double-sided adhesive on the back of the PC convexity and trim the excess waste of the double-sided adhesive. Due to the multiple processes and difficulty in waste removal, this method is time-consuming, low in efficiency, and not suitable for mass production. In addition, when trimming the waste, the double-sided adhesive is easily left on the edge area of the convexity 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 an insulation gasket for a battery cell to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A convex heat forming die forming process for an insulation gasket for a battery cell, comprising the following steps:

[0007] S1: Compound 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;

[0008] S2: Insert the heating rod into the heating through hole on the preheating template and the convex heating die template, increase the temperature of the preheating template and the convex heating die template, and heat the composite material when the upper template of the machine is downwardly combined with the film;

[0009] S3: the upper die plate resets, and the composite material continues to advance under the action of the feeding mechanism; when the composite material reaches below the convex heating punch die plate, the upper die plate is lowered again at this time, the convex heating punch die plate contacts the lower die plate, at this time, the convex heating punch die plate is extruded and moves upward, a top block is arranged between the convex punch and the upper die plate, under the action of the top block, the convex punch is exposed to punch the composite material, in the process of punching, the convex punch is pressed into the bottom spring groove on the lower die plate to form a convex shape;

[0010] S4: the upper die plate resets again, and the composite material continues to advance under the action of the feeding mechanism; when the convex shape moves to the convex avoiding groove position, the upper die plate is lowered again at this time, the punched convex shape enters the convex avoiding groove, the special-shaped punch punches other positions of the composite material to punch out other inner holes, and the convex circular hole punch punches the inside of the convex shape to punch out the convex internal circular hole.

[0011] Preferably, the heating rod is controlled by a heating box to control the temperature of the heating rod at 45-50 DEG C.

[0012] Preferably, an auxiliary spring is arranged in the bottom spring groove, and a metal sheet is arranged above the auxiliary spring and is slidingly clamped in the bottom spring groove.

[0013] Preferably, a plurality of blanking through holes and convex circular hole blanking through grooves are arranged on the lower die plate.

[0014] Preferably, the main material PC and the double-sided adhesive tape are compounded by a laminating machine.

[0015] Preferably, the head edge of the convex punch is arc-shaped.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1. The insulating gasket with convex type is effectively manufactured, heat treatment and hardware molds are combined, compared with the previous process, the production speed and efficiency are improved, the required labor is reduced, the product defects are reduced, and the process can be used for batch manufacturing;

[0018] 2. The main material PC and the double-sided adhesive tape are compounded, then preheated by a preheating die plate, then the convex shape of the composite material is punched, and the circular hole in the convex interior 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;

[0019] 3. The convex avoiding groove is arranged on the lower die plate to ensure that the subsequent convex shape is not extruded and deformed in the process of punching other positions and the circular hole in the convex interior. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The schematic diagram of the heating plate and the heating box of the present application;

[0021] Figure 2 The schematic diagram of the upper die plate and the lower die plate of the present application;

[0022] Figure 3 The side view of the upper die plate and the lower die plate of the present application;

[0023] Figure 4 The schematic diagram of the composite material of the present application;

[0024] Figure 5 The process flow chart of the present application.

[0025] In the figure: 1, preheating die plate; 2, heating through hole; 3, heating rod; 4, heating box; 5, convex heating punch die plate; 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, top block; 15, auxiliary spring; 16, metal sheet; 17, convex round hole blanking through slot. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying 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 the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] Please refer to Figures 1 to 5 The present application provides a technical solution:

[0028] A forming process of a protruding thermoforming die for an insulating gasket of an electric core, comprising the following steps:

[0029] 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 the laminating machine. In this embodiment, the main material PC is an engineering plastic of polycarbonate substrate, 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 the laminating machine. The difference from the existing process is that the existing technology first sucks out the convex shape profile on the main material PC, then laminates the double-sided adhesive, and then trims the excess waste. The whole process consumes 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 two are laminated by the laminating machine before the convex shape profile is formed, which is high in lamination degree and convenient for subsequent batch production. This process is completely separated from the process of forming the convex shape profile, which is more suitable for batch production and actual production needs.

[0030] 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 and the feeding mechanism to stop the composite material when the mold is closed, and to drive the composite material to continue to advance when the upper mold plate 12 and the lower mold plate 13 are separated.

[0031] S2: The heating rod 3 is inserted into the heating hole 2 on the preheating mold plate 1 and the convex heating die plate 5 to increase the temperature of the preheating mold plate 1 and the convex heating die plate 5. When the upper mold plate 12 of the machine is closed, the preheating mold plate 1 heats the composite material. The temperature of the heating rod 3 is controlled by the heating box 4, and the temperature of the heating rod 3 is controlled at 45-50°C. In this embodiment, the heating rod 3 and the heating box 4 are electrically connected by wires, and the temperature of the heating rod 3 is controlled by the heating box to maintain the temperature of the heating rod 3 at 45-50°C. The operator places the heating rod 3 in the heating hole 2 on the preheating mold plate 1 and the convex heating die plate 5, and heats the preheating mold plate 1 and the convex heating die plate 5 by the heating rod 3. When the preheating mold plate 1 and the convex heating die plate 5 reach the required temperature, the subsequent stamping work can be carried out. The heating rod 3 only needs to be placed in the heating hole 2 without being taken out, which is convenient for maintaining the temperature of the preheating mold plate 1 and the convex heating die plate 5.

[0032] During the whole process, when the composite material moves under the action of the feeding mechanism to the lower side of the preheating mold plate 1, the upper mold plate 12 is closed downward, the preheating mold plate 1 is preheated to the composite material, and the next process of convex shape stamping is facilitated.

[0033] S3: the upper die plate 12 resets, the composite material continues to advance under the action of the feeding mechanism, when the composite material reaches below the convex heating punch die plate 5, at this time the upper die plate 12 is closed again, the convex heating punch die plate 5 and the lower die plate 13 are in contact, at this time the convex heating punch die plate 5 is extruded and moves upward, the convex punch 10 and the upper die plate 12 are provided with a top block 14, under the action of the top block 14, the convex punch 10 protrudes to punch the composite material, in the process of punching, the convex punch 10 punches the composite material into the bottom spring groove 6 on the lower die plate 13, forming a convex shape, the head edge of the convex punch 10 is arc-shaped, the edge of the convex punch 10 is arc-shaped, the middle is a plane, the convex heating punch die plate 5 is also heated, when the composite material heated by the preheating plate 1 reaches below the convex heating punch die plate 5, at this time the upper die plate 12 is closed again, the convex heating punch die plate 5 and the upper die plate 12 in this embodiment are provided with a spring, in the process of closing the upper die plate 12 downward, the convex heating punch die plate 5 first contacts the lower die plate 13 and is extruded, at this time the convex heating punch die plate 5 moves upward, then the convex punch 10 protrudes under the action of the top block 14 to punch the composite material.

[0034] In this process, the convex heating punch die plate 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 punching process stable, when the convex punch 10 punches, it punches the composite material into the bottom spring groove 6, forming a convex shape.

[0035] The convex shape is punched in the bottom spring groove 6, the bottom spring groove 6 is provided with an auxiliary spring 15, a metal sheet 16 is arranged above the auxiliary spring 15, the metal sheet 16 is slidingly clamped in the bottom spring groove 6, by arranging the auxiliary spring in the bottom spring groove 6, it can provide an upward force for the composite material, ensuring that the punched part of the composite material is not too loose in the process of punching, preventing the material from wrinkling, at the same time, the metal sheet 16 is arranged above the auxiliary spring 15, avoiding the material of the convex shape part from directly contacting the auxiliary spring 15 when punching, which can also ensure that the convex shape does not wrinkle.

[0036] S4: the upper die plate 12 resets 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, at this time the upper die plate 12 is closed again, the punched convex shape enters the convex avoiding groove 8, the special-shaped punch 9 punches other positions of the composite material to punch out other inner holes, at the same time, the convex round hole punch 7 punches the inside of the convex shape to punch out the convex inside round hole, the lower die plate 13 is provided with a plurality of blanking through holes 11 and convex round hole blanking through grooves 17.

[0037] After the convex shape stamping is formed, the composite material continues to move to the right, and subsequent stamping of other ordinary holes and punching of the inside of the convex shape is required. During the entire material production process, not only the convex shape of the composite material needs to be punched, but also other parts of the composite material need to be punched, and the inside of the convex shape needs to be punched. The present 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 simultaneously implemented in the third stage. The working principle of the special-shaped punch 9 is the same as that of the convex punch 10.

[0038] If the ordinary punching and the punching of the inside of the convex shape are completed at the same time, a problem may arise during the punching process. During the clamping process of the upper die plate 12 and the lower die plate 13, the other convex shapes may be crushed. Therefore, the present process has a convex avoidance slot 8 on the lower die plate 13 to ensure that the remaining convex shapes will not be damaged during ordinary punching and punching of the inside of the convex shape.

[0039] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A forming process for a thermoforming mold of an insulating gasket for battery cells, characterized in that, Includes the following steps: S1: The main material PC and double-sided adhesive are combined to form a composite material, which is then placed on one side of the machine and installed in the feeding mechanism. S2: Insert the heating rod (3) into the heating through hole (2) on the preheating template (1) and the convex heating stamping template (5) to increase the temperature of the preheating template (1) and the convex heating stamping template (5). When the template (12) on the machine closes downward, the preheating template (1) heats the composite material. S3: The upper template (12) is reset, and the composite material continues to move forward under the action of the feeding mechanism. When the composite material reaches the bottom of the convex heating stamping template (5), the upper template (12) closes down again, and the convex heating stamping template (5) and the lower template (13) come into contact. At this time, the convex heating stamping template (5) is squeezed and moved upward. A top block (14) is set between the convex punch (10) and the upper template (12). Under the action of the top block (14), the convex punch (10) is exposed to stamp the composite material. During the stamping process, the convex punch (10) presses the composite material into the bottom spring groove (6) on the lower template (13) to form the convex shape. S4: The upper template (12) is reset again, and the composite material continues to move forward under the action of the feeding mechanism. When the convex shape moves to the position of the convex relief groove (8), the upper template (12) closes down again, and the punched convex shape enters the convex relief groove (8). The irregular punch (9) punches other positions of the composite material and punches out other inner holes. At the same time, the convex round hole punch (7) punches the inside of the convex shape and punches out the inner round hole of the convex.

2. The forming process of a thermoforming mold for an insulating pad for a battery cell according to claim 1, characterized in that: The heating rod (3) is temperature controlled by the heating box (4), and the temperature of the heating rod (3) is controlled at 45℃-50℃.

3. The forming process of a thermoforming mold for an insulating pad for a battery cell according to claim 2, characterized in that: An auxiliary spring (15) is provided inside the bottom spring groove (6), and a metal plate (16) is provided above the auxiliary spring (15). The metal plate (16) is slidably locked inside the bottom spring groove (6).

4. The forming process of a thermoforming mold for an insulating pad for a battery cell according to claim 3, characterized in that: The lower template (13) is provided with several material discharge through holes (11) and convex round hole material discharge through grooves (17).

5. The forming process of a thermoforming mold for an insulating pad for a battery cell according to claim 1, characterized in that: The main material PC and double-sided adhesive are laminated using a laminating machine.

6. The forming process of a thermoforming mold for an insulating pad for a battery cell according to claim 1, characterized in that: The head edge of the convex punch (10) is arc-shaped.

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