Top seal preheating end socket device of polymer lithium ion battery

Abstract

The utility model belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a top seal preheating end socket device of a polymer lithium ion battery, which comprises an upper end socket and a lower end socket which have the same structure and are respectively arranged on a base, and further comprises a preheating module, and the preheating modules are respectively arranged on the upper sealing head and the lower sealing head. New equipment and equipment with large space allowance can use a separated preheating block, and old equipment can use an integrated sealing head, so that the change caused by space and preheating can be solved. By using the design, the equipment debugging difficulty is reduced, the equipment remodeling debugging time is saved, the energy is saved, various defects of a finished product are reduced, the quality is improved, wide application in production is facilitated, and great production practice significance is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a top sealing preheating head sealing device for a polymer lithium ion battery. Background Art

[0002] At present, lithium-ion batteries are increasingly developing in the direction of high capacity and light weight. The existing soft-pack polymer lithium-ion batteries are mainly protected and sealed after being encapsulated with aluminum-plastic film. This process requires stamping and cutting the aluminum-plastic shell first, cutting the front end of the shell to the size for top sealing packaging, and then the aluminum-plastic shell is sealed under the action of a certain metal head under the combined action of time, pressure and temperature parameters.

[0003] When packaging existing soft-package lithium-ion batteries, the main method is to use a packaging machine to perform composite packaging with the inner layer PP glue of the ear glue and the three-layer aluminum-plastic packaging film under heating. This packaging method must not only meet the tightness of the packaging, but also ensure that the shell appearance is not crushed or broken, and avoid corrosion and short circuit of the battery, which may cause safety hazards. The actual packaging parameters directly act on or transform the surface of the head body. With the changes in material types, processes, and performance, the packaging difficulty increases. Due to the different melting points and physical properties of different materials, it is impossible to effectively package within the original parameter range, which can easily cause poor packaging (uneven PP sol, broken ear, damaged aluminum-plastic appearance, etc.). Some existing technologies cannot be widely promoted to automated lines when used, and can only be used for manual single-machine use. In addition, the cost of modification and installation is high, and the equipment structure is mostly improved, and the packaging mold is not designed and optimized, and the parameter compatibility is poor. Utility Model Content

[0004] The utility model aims to provide a top sealing and preheating head sealing device for a polymer lithium ion battery.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a top sealing and preheating head device for a polymer lithium-ion battery, comprising an upper head and a lower head with the same structure, the upper head and the lower head are respectively installed on a base, and also comprises a preheating module, the preheating module is respectively installed on the upper head and the lower head.

[0006] Preferably, the preheating module is independently installed on the sides of the upper head and the lower head.

[0007] Preferably, the preheating module is integrally formed with the upper head and the lower head respectively.

[0008] Preferably, the upper head and the lower head respectively include an I-shaped surface packaging area and positive / negative electrode ear grooves.

[0009] Preferably, the non-packaging areas on both sides of the upper head and the lower head protrude to form a specific height limiting area.

[0010] Preferably, a heating tube is installed in the preheating module.

[0011] Preferably, one side of the “I”-shaped surface packaging area of ​​the upper head and the lower head is provided with a glue avoidance groove.

[0012] Preferably, the edges of the upper and lower heads, and the edges of the positive / negative electrode ear grooves are chamfered respectively.

[0013] Preferably, the preheating module is an L-shaped structure.

[0014] Preferably, the bottoms of the upper head and the lower head are provided with mounting holes.

[0015] The beneficial effect of the utility model is that compared with the prior art, new equipment and equipment with large space margin can use separate preheating blocks, and old equipment can use integrated heads, which can solve the space problem and make use of the changes brought by preheating. The use of this design reduces the difficulty of equipment debugging, saves equipment changeover debugging time, saves energy, reduces various defects of finished products and improves quality, which is conducive to wide application in production and has great production practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the integrated head in the utility model;

[0017] Figure 2 It is a three-dimensional diagram of the split head in the utility model;

[0018] Figure 3 It is a three-dimensional diagram of the lower head in the integrated head of the utility model;

[0019] Figure 4 It is a stereoscopic diagram of the lower head in the split head of the utility model. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0021] like Figure 1 and Figure 2 As shown, a top sealing and preheating head device for a polymer lithium-ion battery includes an upper head 1 and a lower head 2 with the same structure, the upper head and the lower head are respectively installed on a base, and also includes a preheating module 11, which is respectively installed on the upper head and the lower head.

[0022] According to the different installation positions of the preheating module, the device divides the head structure into an integrated head and a separated head.

[0023] Specifically, Figure 1 and Figure 3 As shown, the structure of the integrated head is as follows:

[0024] The upper head 1 includes an "I"-shaped surface packaging area and positive / negative electrode ear slots 6. The slot size is designed according to the preheating requirements. The upper surface is flush except for the depth of the electrode ear slot. The non-packaging areas on both sides of the head protrude to form a first limiting area 3 and a second limiting area 4 of a specific height.

[0025] The structure of the lower head 2 is the same as that of the upper head 1, and also includes an "I"-shaped surface packaging area, positive / negative electrode ear slots 5, and the slot size is designed according to the preheating requirements. The non-packaging areas on both sides of the head protrude to form a first limiting area 3 and a second limiting area 4 of a specific height.

[0026] The depth of the positive / negative electrode ear groove 5 is set differently according to the material, limit, compression ratio, actual packaging effect, etc.

[0027] The integrated head does not require separate installation and debugging. The preheating module and the head are processed and formed in one piece. The size of the preheating block is reasonably designed according to the size of the tab and package. There is a certain design gap in the preheating part to reduce excessive interference with the tab position. The preheating surface and the package surface have a certain gap to ensure the thermal deformation of the tab glue is stable, and the whole is heated together with a uniform temperature.

[0028] like Figure 2 and Figure 4 As shown, the preheating module in the separate head is independent of the head body and needs to be installed separately. The size of the preheating block is reasonably designed according to the size of the tabs and the package. The positive and negative tabs can be heated separately or together with temperature control. The module is connected to the base and the head is connected synchronously. The preheating module body can adjust the gap height and the distance from the head body.

[0029] The base is used for installing the upper head 1, the lower head 2, the pre-sealing module 8, the heating tube 9, and the thermocouple to ensure the horizontality of the head installation;

[0030] The heating tube and thermocouple are used for heating control and temperature detection of the upper and lower heads. They can be installed on the base or integrated with the heads.

[0031] The packaging area of ​​the upper and lower heads is provided with side glue avoidance grooves 6 and middle glue avoidance grooves 7. The middle glue avoidance groove can play two roles: one is to prevent adhesion caused by excessive glue overflow, and the other is that the middle position can balance the pressure. The edges of the head packaging body, the edges of the tab grooves, and the edges of the preheating block are chamfered to prevent damage and glue overflow. The grooves are set in the middle position to reduce the stress deformation of the long-sized head and improve the packaging stability.

[0032] Through the integrated head and the separated head, the aluminum plastic in the packaging area is heated while the tab is heated to balance the overall packaging temperature. The relevant packaging parameter standards can also be reduced (temperature reduced by 5-10°C, pressure reduced by 10-25%, time reduced by 1-1.5s), avoiding the damage and fracture of the aluminum plastic and the tab due to excessive packaging parameters. The lower head limit area is designed according to the packaging thickness and the use of pre-sealed modules allows the upper and lower heads to ensure a certain gap when packaging the top of the battery to avoid the lack of thickness and melt glue, and the use of glue avoidance grooves and chamfers reduces the excessive overflow of PP glue in the inner layer of the aluminum plastic packaging film. This design also avoids the instability caused by some mechanical structures such as springs and connecting rods, and solves the problem of horizontal deployment of equipment.

[0033] It should be pointed out that the device can be used to transport semi-finished lithium batteries, provide vacuum or inert gas according to requirements, and select different accessories for combination to make full use of space and improve work efficiency. For ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the scope of protection of the utility model.

Claims

1. A top sealing preheating head sealing device for a polymer lithium-ion battery, comprising an upper head sealing device and a lower head sealing device of the same structure, the upper head sealing device and the lower head sealing device being respectively mounted on a base, characterized in that: It also includes a preheating module, which is installed on the upper head and the lower head respectively.

2. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 1, characterized in that: The preheating modules are independently installed on the sides of the upper head and the lower head.

3. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 1, characterized in that: The preheating module is integrally formed with the upper head and the lower head respectively.

4. The top sealing preheating head sealing device for polymer lithium-ion batteries according to claim 1 or 2, characterized in that: The upper end cap and the lower end cap respectively include an "I"-shaped surface packaging area and positive / negative electrode ear grooves.

5. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 4, characterized in that: The non-packaging areas on both sides of the upper head and the lower head protrude to form a specific height limiting area.

6. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 2, characterized in that: A heating pipe is installed in the preheating module.

7. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 4, characterized in that: One side of the "I"-shaped surface packaging area of ​​the upper head and the lower head is provided with a glue avoidance groove.

8. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 1, characterized in that: The edges of the upper and lower heads and the edges of the positive / negative electrode ear grooves are chamfered respectively.

9. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 6, characterized in that: The preheating module is an L-shaped structure.

10. The top sealing and preheating head sealing device for polymer lithium-ion batteries according to claim 1, characterized in that: The bottoms of the upper head and the lower head are provided with mounting holes.

Images