A pouch battery heat seal mold structure and device

Abstract

The utility model discloses a kind of soft package battery heat sealing mould structure and device, one kind of soft package battery heat sealing mould structure includes upper head mould and lower head mould, the opposite end of the upper head mould and the lower head mould is equipped with encapsulation end face;Upper heat insulation shell is sleeved on the outside of the upper head mould, lower heat insulation shell is sleeved on the outside of the lower head mould;The upper heat insulation shell and the lower heat insulation shell are respectively provided with opening corresponding to the encapsulation end face;By respectively sleeving upper heat insulation shell and lower heat insulation shell on the outside of upper head mould and lower head mould, and respectively setting opening in the position corresponding to encapsulation end face, so that under the premise of not interfering encapsulation operation, the main exposed surface of covering head mould is covered, reduce the heat exchange between head and air, effectively improve the heat insulation performance of head mould, reduce heat loss in head heating process, reduce the influence to other components, reduce heating power demand, to improve heat sealing efficiency and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a heat-sealing mold structure and device for soft-pack batteries. Background Technology

[0002] In the production of lithium-ion pouch batteries, the heat-sealing of aluminum-plastic film is a crucial step in ensuring the cell's sealing and stability. To achieve a strong bond between the aluminum-plastic films, mating end-cap molds are often used to heat and press them together, melting the heat-sealing layer of the aluminum-plastic film to form a sealed structure.

[0003] End cap molds require high temperatures for stable heat sealing during use. Existing end cap molds are generally made of high thermal conductivity metals, which have high heat capacity and thermal conductivity. Because the end cap is in an open environment, frequent heat exchange with the surrounding air leads to significant heat loss. To maintain a constant end cap temperature, high-power heating is typically required, resulting in increased energy consumption and shortened equipment lifespan. Furthermore, the heat radiation from the end cap at high temperatures can adversely affect surrounding components, impacting equipment safety and the stability of the encapsulation quality. Existing end cap structures have significant shortcomings in thermal management, necessitating structural optimization to improve their thermal insulation performance and reduce energy consumption. Utility Model Content

[0004] The main purpose of this invention is to propose a heat-sealing mold structure and device for soft-pack batteries, which aims to solve the problems of insufficient heat insulation performance and high energy consumption of existing end cap structures in terms of thermal energy management.

[0005] To achieve the above objectives, this utility model proposes a heat-sealing mold structure for a soft-pack battery, including an upper end mold and a lower end mold. Both the upper end mold and the lower end mold have encapsulation end faces at their opposite ends. An upper heat insulation shell is fitted on the outside of the upper end mold, and a lower heat insulation shell is fitted on the outside of the lower end mold. The upper heat insulation shell and the lower heat insulation shell each have an opening corresponding to the encapsulation end face.

[0006] In some embodiments, the top surface of the upper end cap mold and the bottom surface of the lower end cap mold are provided with a plurality of bolt holes, and the upper heat insulation shell and the lower heat insulation shell are provided with a first through hole corresponding to the bolt holes; the upper heat insulation shell is detachably connected to the upper end cap mold by bolts, and the lower heat insulation shell is detachably connected to the lower end cap mold by bolts.

[0007] In some embodiments, the encapsulation end face includes a hot-pressed surface and a battery resting surface; the upper heat insulation shell and / or the lower heat insulation shell includes a housing and a plate disposed at the opening, the plate extending toward the hot-pressed surface and covering the battery resting surface.

[0008] In some embodiments, the battery mounting surface is provided with a plurality of bolt holes, and the plate is provided with a first through hole corresponding to the bolt holes; the plate is detachably connected to the upper end mold or the lower end mold by bolts.

[0009] In some embodiments, the sidewalls of the upper end cap mold and the lower end cap mold are provided with a plurality of heating rod mounting holes, and the upper heat insulation shell and the lower heat insulation shell are provided with a second through hole corresponding to the heating rod mounting hole, and the second through hole is provided in a one-to-one correspondence with the heating rod mounting hole.

[0010] In some embodiments, the hot-pressing surface is further provided with a tab groove, and both the upper heat insulation shell and the lower heat insulation shell are provided with a third through hole corresponding to the tab groove.

[0011] In some embodiments, the upper heat insulation shell is provided in two separate parts, including a first shell that is fitted to the outer side wall of the upper end cap mold and a first plate that is fitted to the encapsulation end face.

[0012] In some embodiments, the lower heat insulation shell is provided in separate parts, including a second shell that is fitted to the outer side wall of the lower end cap mold and a second plate that is fitted to the encapsulation end face.

[0013] In some embodiments, the thickness of the upper insulation shell and / or the lower insulation shell is 1-4 mm.

[0014] This utility model also proposes a heat-sealing device for soft-pack batteries, including the aforementioned heat-sealing mold structure for soft-pack batteries.

[0015] This invention involves fitting an upper heat insulation shell and a lower heat insulation shell onto the outer sides of the upper and lower end-cap molds, respectively, with openings at the corresponding encapsulation end faces. This allows the main exposed surfaces of the end-cap molds to be covered without interfering with the heat-sealing operation, significantly reducing heat exchange between the end cap and the air, effectively improving the heat insulation performance of the end-cap mold, reducing heat loss during the heating process of the end cap, minimizing the impact on other components, and reducing the heating power requirement, thereby improving heat-sealing efficiency and reducing energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a heat-sealing mold for a soft-pack battery according to the present invention.

[0017] Figure 2 This is an exploded view of the heat-sealing mold structure for a soft-pack battery according to this utility model;

[0018] Explanation of reference numerals: 1. Upper end cap mold; 2. Lower end cap mold; 3. Encapsulation end face; 301. Hot pressing surface; 302. Battery mounting surface; 4. Upper heat insulation shell; 5. Lower heat insulation shell; 6. Opening; 7. Bolt hole; 8. First through hole; 9. Shell; 901. First shell; 902. Second shell; 10. Plate; 1001. First plate; 1002. Second plate; 11. Heating rod mounting hole; 12. Second through hole; 13. Tab groove; 14. Third through hole.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0023] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0024] See Figure 1 and Figure 2This embodiment proposes a heat-sealing mold structure for a soft-pack battery, including an upper end mold 1 and a lower end mold 2. Both the upper end mold 1 and the lower end mold 2 have encapsulation end faces 3 at their opposite ends. An upper heat insulation shell 4 is fitted on the outside of the upper end mold 1, and a lower heat insulation shell 5 is fitted on the outside of the lower end mold 2. The upper heat insulation shell 4 and the lower heat insulation shell 5 are respectively provided with openings 6 corresponding to the encapsulation end faces 3.

[0025] During use, the upper end-cap mold 1 and the lower end-cap mold 2 cooperate with each other. Through heating and pressurization, the heat-sealing layer of the aluminum-plastic film melts at the encapsulation end face 3, fusing the periphery of the aluminum-plastic film surrounding the bare battery cell together to achieve a sealing function. The upper heat insulation shell 4 and the lower heat insulation shell 5 respectively cover the outside of the upper end-cap mold 1 and the lower end-cap mold 2, and the structural fit and material selection isolate heat radiation outward. Both the upper heat insulation shell 4 and the lower heat insulation shell 5 have reserved openings 6, corresponding to the encapsulation end face 3, to ensure that effective heat insulation is achieved without affecting the battery heat sealing operation. This embodiment effectively isolates heat diffusion from other areas while ensuring temperature stability and heat transfer efficiency in the heat-sealing area, reducing the temperature of the mold shell and helping to protect operators and the battery body from unnecessary heat damage.

[0026] Furthermore, multiple bolt holes 7 are provided on the top surface of the upper end cap mold 1 and the bottom surface of the lower end cap mold 2. The upper heat insulation shell 4 and the lower heat insulation shell 5 are provided with first through holes 8 corresponding to the bolt holes 7. The upper heat insulation shell 4 is detachably connected to the upper end cap mold 1 by bolts, and the lower heat insulation shell 5 is detachably connected to the lower end cap mold 2 by bolts. The top surface of the upper end cap mold 1 and the bottom surface of the lower end cap mold 2 are both on the side away from the sealing end face 3. By utilizing the existing bolt holes 7 on the upper end cap mold 1 and the lower end cap mold 2, the upper heat insulation shell 4 and the lower heat insulation shell 5 are assembled to the upper end cap mold 1 and the lower end cap mold 2 respectively by bolts. No secondary drilling is required. It is possible to reliably fix and tightly fit the upper heat insulation shell 4 and the lower heat insulation shell 5 without damaging the structure of the end cap body, and avoid the heat sealing effect being affected by the loosening, displacement or falling off of the heat insulation material.

[0027] Furthermore, the encapsulation end face 3 includes a hot-pressing surface 301 and a battery resting surface 302; the upper heat insulation shell 4 and / or the lower heat insulation shell 5 include a shell 9 and a plate 10 disposed at the opening 6, the plate 10 extending toward the hot-pressing surface 301 and covering the battery resting surface 302; during the soft-pack battery encapsulation process, the hot-pressing surface 301 directly contacts the aluminum-plastic film of the soft-pack battery and welds it together to achieve sealing, while the battery resting surface 302 provides a placement position for the soft-pack battery during the encapsulation process; the setting of the plate 10 can further expand the thermal insulation area on the basis of the original structure of the upper heat insulation shell 4 / lower heat insulation shell 5; the covering of the battery resting surface 302 by the plate 10 helps to improve the shielding and heat insulation protection capabilities of the battery introduction area and reduce the adverse effects of heat radiation on the battery.

[0028] Furthermore, the battery mounting surface 302 is provided with multiple bolt holes 7, and the plate 10 is provided with a first through hole 8 corresponding to the bolt holes 7; the plate 10 is detachably connected to the upper end mold 1 or the lower end mold 2 by bolts; by utilizing the existing bolt holes 7 on the battery mounting surface 302 and providing a corresponding first through hole 8 on the plate 10, the detachable fixing of the plate 10 structure is achieved, which facilitates the rapid assembly and disassembly of the plate 10 during the heat insulation protection process, and is particularly suitable for daily maintenance, replacement or cleaning operations.

[0029] Furthermore, the side walls of the upper end cap mold 1 and the lower end cap mold 2 are provided with multiple heating rod mounting holes 11. The upper heat insulation shell 4 and the lower heat insulation shell 5 are provided with second through holes 12 corresponding to the heating rod mounting holes 11. The second through holes 12 are provided one-to-one with the heating rod mounting holes 11. The heating rod mounting holes 11 are used to install heating rods, and the heating rods are used to provide heat energy during the sealing process. By providing second through holes 12 one-to-one with the heating rod mounting holes 11, the heat is concentrated and conducted locally, while also facilitating the disassembly and replacement of the heating rods, thus simplifying the maintenance process.

[0030] Furthermore, the hot-pressed surface 301 is also provided with a tab groove 13, and the upper heat insulation shell 4 and the lower heat insulation shell 5 are provided with a third through hole 14 corresponding to the tab groove 13. The tab groove 13 in the upper end mold 1 and the lower end mold 2 can prevent the tab part of the battery cell from being squeezed during the packaging process, thus protecting its structural integrity. By providing a second through hole 12 on the upper heat insulation shell 4 and the lower heat insulation shell 5 respectively, a passage path can be reserved for the tab, while ensuring the structural stability and functional integrity of the upper heat insulation shell 4 and the lower heat insulation shell 5, without affecting the overall heat preservation effect.

[0031] Furthermore, the upper heat insulation shell 4 is configured as a split structure, including a first shell 901 that is fitted to the outer wall of the upper end mold 1 and a first plate 1001 that is fitted to the encapsulation end face 3. The upper heat insulation shell 4 is designed as a split structure, which helps to cover different key parts of the mold separately. The first shell 901 is fitted to the outer wall of the upper end mold 1 to achieve large-area heat shielding and prevent heat from being conducted to non-encapsulation areas; while the first plate 1001 is fitted to the encapsulation end face 3 to further expand the heat insulation coverage of the upper end mold 1 and improve the heat insulation protection effect on the battery placement area.

[0032] Furthermore, the lower heat insulation shell 5 is configured in two parts, including a second shell 902 that is fitted to the outer wall of the lower end mold 2 and a second plate 1002 that is fitted to the encapsulation end face 3; the second shell 902 is tightly fitted to the outer wall of the lower end mold 2 to form a basic heat insulation covering; the second plate 1002 covers the battery resting area corresponding to the encapsulation end face 3, expanding the heat insulation coverage of the upper end mold 1 and improving the heat insulation protection effect on the battery resting area.

[0033] Furthermore, the thickness of the upper heat insulation shell 4 and / or the lower heat insulation shell 5 is 1-4mm. Controlling the thickness of the heat insulation shell within this range can ensure good heat insulation performance while taking into account the lightweight structure and ease of processing. It avoids the problem of increased assembly difficulty due to excessive thickness or insufficient heat insulation performance due to excessive thinness, thereby improving the cost-effectiveness and practicality of the overall encapsulation system.

[0034] In some other embodiments, the thickness of the upper heat insulation shell 4 and / or the lower heat insulation shell 5 gradually increases near the outer ring of the heating rod mounting hole 11. Since heat energy is more easily diffused at this location, by setting a structure with increasing thickness around the heating rod mounting hole 11, the local heat insulation performance can be effectively enhanced without increasing the overall structural volume, slowing down the diffusion of heat to the outside, and further reducing the energy waste caused by heat loss.

[0035] In this embodiment, both the upper heat insulation shell 4 and the lower heat insulation shell 5 are made of heat insulation material; using heat insulation material as the main component material can effectively suppress heat loss during the operation of the head mold and improve heat sealing efficiency.

[0036] In some other embodiments, a heat-sealing device for a pouch battery is also proposed, including the aforementioned heat-sealing mold structure for a pouch battery.

[0037] The above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A pouch battery heat-seal mold structure, characterized by, It includes an upper end cap mold and a lower end cap mold, and both the upper end cap mold and the lower end cap mold have encapsulation end faces at their opposite ends; an upper heat insulation shell is fitted on the outside of the upper end cap mold, and a lower heat insulation shell is fitted on the outside of the lower end cap mold; the upper heat insulation shell and the lower heat insulation shell are respectively provided with openings corresponding to the encapsulation end faces. 2.The pouch battery heat-seal mold structure of claim 1, wherein, The top surface of the upper end cap mold and the bottom surface of the lower end cap mold are provided with multiple bolt holes, and the upper heat insulation shell and the lower heat insulation shell are provided with a first through hole corresponding to the bolt holes; the upper heat insulation shell is detachably connected to the upper end cap mold by bolts, and the lower heat insulation shell is detachably connected to the lower end cap mold by bolts. 3.The pouch battery heat-seal mold structure of claim 2, wherein, The encapsulation end face includes a hot-pressing surface and a battery resting surface; the upper heat insulation shell and / or the lower heat insulation shell includes a shell and a plate disposed at the opening, the plate extending toward the hot-pressing surface and covering the battery resting surface. 4.The pouch battery heat-seal mold structure of claim 3, wherein, The battery mounting surface has multiple bolt holes, and the plate has a first through hole corresponding to the bolt holes; the plate is detachably connected to the upper end mold or the lower end mold by bolts. 5.The pouch battery heat-seal mold structure of claim 1, wherein, The upper end cap mold and the lower end cap mold have multiple heating rod mounting holes on their side walls. The upper heat insulation shell and the lower heat insulation shell are provided with second through holes corresponding to the heating rod mounting holes. The second through holes are provided one-to-one with the heating rod mounting holes. 6.The pouch battery heat-seal mold structure of claim 3, wherein, The hot-pressed surface is also provided with a tab groove, and both the upper heat insulation shell and the lower heat insulation shell are provided with a third through hole corresponding to the tab groove. 7.The pouch battery heat-seal mold structure of claim 3, wherein, The upper heat insulation shell is a separate structure, including a first shell that is fitted to the outer side wall of the upper end cap mold and a first plate that is fitted to the encapsulation end face. 8.The pouch battery heat-seal mold structure of claim 3, wherein, The lower heat insulation shell is a separate structure, including a second shell that is fitted to the outer wall of the lower end cap mold and a second plate that is fitted to the encapsulation end face. 9.The pouch battery heat-seal mold structure of claim 1, wherein, The thickness of the upper and / or lower insulation shell is 1-4 mm.

10. A pouch battery heat sealing device characterized by comprising: It includes the heat-sealing mold structure for soft-pack batteries as described in any one of claims 1 to 9.

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