End socket structure for packaging top side of flexible package lithium ion battery

Abstract

The utility model discloses an end socket structure for packaging the top side of a flexible package lithium ion battery, and belongs to the technical field of battery preparation devices. According to the end socket structure for packaging the top side of the flexible package lithium ion battery, the tab is prevented from being excessively extruded in the packaging process by arranging the tab groove, the inner arc-shaped parts are connected to the two ends of the upper die body and the two ends of the lower die body, so that a sealing strip with the two arc-shaped ends is formed after the top sealing area is sealed; and the intersection position of the sealing strip formed when the side sealing area is packaged and the sealing strip is staggered from the position of the vertex of the battery, so that the damage of packaging to a corresponding aluminum plastic film at the vertex of the battery is reduced, and the safety of the soft package lithium ion battery is further improved. The first step surface and the second step surface are arranged to accommodate the flexible package lithium ion battery body during mold closing, so that the battery body is limited, and the situation that the packaging effect is affected due to the improper placement position of the battery is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery preparation devices, and in particular relates to a head sealing structure for top side packaging of a soft-package lithium-ion battery. Background Art

[0002] During the production stage of soft-pack lithium-ion batteries, after wrapping the battery with aluminum-plastic film, the top sealing area is sealed first, and then the side sealing area is sealed. Since the inner layer of the aluminum-plastic film is a PP layer, when the temperature reaches the set value, the PP layer melts and glues together to achieve sealing. The existing seal is used for the sealing structure of the top sealing area. After the aluminum-plastic film is squeezed and sealed, a horizontal sealing strip is formed; after the side sealing area is sealed, a longitudinal sealing strip is formed. The horizontal sealing strip and the longitudinal sealing strip cross to achieve the sealing of the aluminum-plastic film.

[0003] Because the metal layer of the aluminum-plastic film will be stretched to a certain extent during sealing, it is equivalent to the intersection of the sealing strips being stretched twice. The intersection of the sealing strips is located at the apex of the battery cell. The aluminum-plastic film at the apex is prone to wrinkles during packaging due to structural reasons. Therefore, the metal layer of the aluminum-plastic film here is more easily damaged, resulting in poor waterproof effect, affecting the safety of the soft-pack lithium-ion battery cell.

[0004] In summary, the existing soft-package lithium-ion battery with a sealed head structure has the problem of poor safety. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a head structure for the top side packaging of a soft-package lithium-ion battery in view of the deficiencies in the above-mentioned prior art, which has a novel and reasonable design, a simple structure, strong practicality, and is easy to promote and use.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A sealing head structure for top side packaging of a soft-package lithium-ion battery comprises an upper mold body and a lower mold body, wherein the upper mold body and the lower mold body are used to clamp the top sealing area of ​​the aluminum-plastic film of the soft-package lithium-ion battery when closing the mold;

[0008] The lower mold body is provided with two tab grooves for accommodating the tabs of the soft-package lithium-ion battery when the mold is closed;

[0009] Both ends of the upper mold body and the lower mold body are connected with inner arc parts, and the area of ​​the aluminum-plastic film of the soft-package lithium-ion battery clamped by the two inner arc parts when the mold is closed overlaps with the side sealing area of ​​the aluminum-plastic film of the soft-package lithium-ion battery;

[0010] The lower mold body has a first step surface on its inner side, and the upper mold body has a second step surface on its inner side. The space between the first step surface and the second step surface is used to place the soft-package lithium-ion battery body.

[0011] Furthermore, it also includes a support plate for supporting the pole ear of the soft-package lithium-ion battery and a spring for supporting the support plate. A first mounting groove for mounting one end of the spring is opened in the pole ear groove, and a second mounting groove for mounting the other end of the spring is opened at the lower end of the support plate.

[0012] Furthermore, a heating plate is connected to the upper end of the support plate.

[0013] Furthermore, heating plates are provided on the contact surfaces of the upper mold body and the lower mold body during mold closing.

[0014] Furthermore, a threaded hole is provided at the upper end of the upper mold body, and a threaded hole is provided at the lower end of the lower mold body.

[0015] Compared with the prior art, the utility model has the following advantages: the head sealing structure of the utility model avoids excessive extrusion of the pole ear during packaging by setting the pole ear groove, and by connecting the inner arc-shaped parts at both ends of the upper mold body and the lower mold body, so that a sealing strip with arc-shaped ends is formed after the top sealing area is sealed, and the intersection position of the sealing strip formed when the side sealing area is packaged and the above-mentioned sealing strip is staggered from the position of the battery vertex, thereby reducing the damage of the packaging to the corresponding aluminum-plastic film at the battery vertex, thereby improving the safety of the soft-pack lithium-ion battery. The first step surface and the second step surface are set to accommodate the soft-pack lithium-ion battery body when the mold is closed, which plays a limiting role on the battery body, avoiding improper placement of the battery and affecting the packaging effect.

[0016] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a head structure for top side packaging of a soft-package lithium-ion battery of the utility model;

[0018] Figure 2 It is a schematic longitudinal cross-sectional view of an embodiment of a head structure for top side packaging of a soft-package lithium-ion battery of the utility model;

[0019] Figure 3 This is a schematic structural diagram of an embodiment of a head structure for top side packaging of a soft-package lithium-ion battery of the utility model when in use;

[0020] Description of reference numerals:

[0021] 1. Upper mold body; 2. Lower mold body; 3. Tab slot; 4. Support plate; 5. Spring;

[0022] 6. inner arc portion; 7. heating plate; 8. threaded hole; 9. first step surface; 10. second step surface; 11. soft-package lithium-ion battery; 12. pole ear. DETAILED DESCRIPTION

[0023] Example of a head structure for top side packaging of a soft package lithium-ion battery:

[0024] like Figure 1-Figure 3 As shown, the sealing structure of the top side package of the soft-package lithium-ion battery includes an upper mold body 1 and a lower mold body 2, which are used to clamp the aluminum-plastic film top sealing area of ​​the soft-package lithium-ion battery 11 when the mold is closed. In order to avoid excessive squeezing of the tabs 12 when the mold is closed, the lower mold body 2 is provided with two tab grooves 3 for accommodating the tabs 12 of the soft-package lithium-ion battery 11 when the mold is closed.

[0025] In order to reduce the damage to the aluminum-plastic film on the top of the battery, both ends of the upper mold body 1 and the lower mold body 2 are connected with inner arc parts 6, and the area of ​​the aluminum-plastic film of the soft-package lithium-ion battery 11 clamped by the two inner arc parts 6 when the mold is closed overlaps with the side sealing area of ​​the aluminum-plastic film of the soft-package lithium-ion battery 11. After the top sealing area is sealed, a sealing strip with arcs at both ends is formed, and the intersection position of the sealing strip formed when the side sealing area is packaged and the above sealing strip is staggered from the position of the battery vertex, thereby reducing the damage of the packaging to the corresponding aluminum-plastic film at the battery vertex, thereby improving the safety of the soft-package lithium-ion battery.

[0026] In order to limit the position of the battery body, a first step surface 9 is provided inside the lower mold body 2, and a second step surface 10 is provided inside the upper mold body 1. The space between the first step surface 9 and the second step surface 10 is used to place the body of the soft-packaged lithium-ion battery 11. The first step surface 9 and the second step surface 10 are provided to accommodate the body of the soft-packaged lithium-ion battery 11 when the mold is closed, which plays a role in limiting the position of the battery body, avoiding improper placement of the battery and affecting the packaging effect.

[0027] like Figure 2In order to ensure the sealing effect at the pole ear 12, a support plate 4 for supporting the pole ear 12 of the soft-package lithium-ion battery 11 and a spring 5 for supporting the support plate 4 are also included. The pole ear groove 3 is provided with a first mounting groove for mounting one end of the spring 5, and the lower end of the support plate 4 is provided with a second mounting groove for mounting the other end of the spring 5. The support plate 4 cooperates with the upper mold body 1 to extrude the aluminum-plastic film to achieve packaging, that is, the support plate 4 provides a supporting effect for the pole ear 12; at the same time, since the support plate 4 is connected to the pole ear groove 3 through the spring 5, an elastic space for squeezing the pole ear 12 is formed between the support plate 4 and the upper mold body 1, so that the pole ear 12 can not only be squeezed and sealed, but also ensure that the force of squeezing the pole ear 12 is appropriate, and the pole ear 12 will not be damaged due to squeezing. The elastic space can also accommodate pole ears 12 of various thicknesses, thereby improving the versatility of the head structure. The spring 5 here can also be replaced by other elastic components.

[0028] In order to ensure the extrusion packaging effect, a heating plate 7 is connected to the upper end of the support plate 4, and heating plates 7 are provided on the contact surfaces of the upper mold body 1 and the lower mold body 2 when the mold is closed. The heating plate 7 is used to melt the PP layer on the aluminum-plastic film to achieve a good adhesion packaging effect.

[0029] For the convenience of installation, a threaded hole 8 is provided at the upper end of the upper mold body 1 and a threaded hole 8 is provided at the lower end of the lower mold body 2. The threaded holes 8 are used to fix the upper mold body 1 and the lower mold body 2 to corresponding installation equipment.

[0030] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A head sealing structure for top side packaging of a soft-package lithium-ion battery, comprising an upper mold body (1) and a lower mold body (2), characterized in that: The upper mold body (1) and the lower mold body (2) are used to clamp the aluminum-plastic film top sealing area of ​​the soft-package lithium-ion battery (11) when the mold is closed; The lower mold body (2) is provided with two tab grooves (3) for accommodating tabs (12) of the soft-package lithium-ion battery (11) when the mold is closed; Both ends of the upper mold body (1) and the lower mold body (2) are connected to inner arc-shaped portions (6), and the areas of the aluminum-plastic film of the soft-package lithium-ion battery (11) clamped by the two inner arc-shaped portions (6) when the molds are closed overlap with the side sealing areas of the aluminum-plastic film of the soft-package lithium-ion battery (11); The lower mold body (2) has a first step surface (9) on its inner side, the upper mold body (1) has a second step surface (10) on its inner side, and the space between the first step surface (9) and the second step surface (10) is used to place the body of the soft-package lithium-ion battery (11).

2. A head structure for top side packaging of a soft package lithium ion battery according to claim 1, characterized in that: It also includes a support plate (4) for supporting a pole lug (12) of a soft-package lithium-ion battery (11) and a spring (5) for supporting the support plate (4); a first mounting groove for mounting one end of the spring (5) is provided in the pole lug groove (3); and a second mounting groove for mounting the other end of the spring (5) is provided at the lower end of the support plate (4).

3. A head sealing structure for top side packaging of a soft package lithium ion battery according to claim 2, characterized in that: The upper end of the support plate (4) is connected to a heating plate (7).

4. A head sealing structure for top side packaging of a soft package lithium ion battery according to claim 1, characterized in that: The upper mold body (1) and the lower mold body (2) are both provided with heating plates (7) on their contact surfaces during mold closing.

5. A head structure for top side packaging of a soft package lithium ion battery according to any one of claims 1 to 4, characterized in that: The upper end of the upper mold body (1) is provided with a threaded hole (8), and the lower end of the lower mold body (2) is provided with a threaded hole (8).

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