Adhesive frame structure for thin film battery
By creating recesses on the thin-film battery substrate to accommodate the adhesive layer, a dot-matrix ring-shaped adhesive frame structure is formed, which solves the problems of high adhesive loss and electrolyte leakage, and achieves a more efficient sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZINERGY SHENZHEN LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-02
AI Technical Summary
Existing adhesive bonding methods for thin-film batteries suffer from problems such as high adhesive loss and electrolyte leakage.
Several recesses are formed on the substrate of the thin-film battery to accommodate the adhesive layer, forming a dot-matrix ring structure adhesive frame, which reduces the amount of adhesive needed and enhances the bonding strength.
It reduces glue consumption, improves the sealing performance of the glue frame structure, and prevents electrolyte leakage.
Smart Images
Figure CN224318540U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thin-film battery technology, and in particular to a frame structure for a thin-film battery. Background Technology
[0002] Thin-film battery encapsulation technology refers to the technology of sealing and protecting the internal cell structure using flexible thin-film materials (i.e., substrates). Its core purpose is to isolate the cell structure from external environmental interference and prevent electrolyte leakage. Encapsulation processes include ultrasonic welding, high-temperature thermosetting, and adhesive bonding. Among these, adhesive bonding is widely used because it has low temperature requirements and the annular frame structure formed by adhesive bonding has good sealing performance. However, adhesive bonding still has some drawbacks, such as the annular frame structure causing greater adhesive loss and uneven printing of the frame leading to electrolyte leakage from the inside.
[0003] It should be noted that the above content is only used to help understand the technical solution of this utility model, and does not represent an admission that the above content is prior art. Utility Model Content
[0004] The main objective of this invention is to propose a frame structure for thin-film batteries, which aims to reduce adhesive loss.
[0005] To achieve the above objectives, this utility model proposes a frame structure for a thin-film battery, wherein the thin-film battery includes two substrates disposed opposite to each other and a cell structure located between the two substrates; specifically, at least one of the substrates is provided with a plurality of first recesses, and the first recesses are located on opposite sides of the two substrates; the plurality of first recesses are arranged in a ring around the circumference of the cell structure; the two substrates are respectively defined as a first substrate and a second substrate, and the first recesses are used to accommodate an adhesive layer, wherein the adhesive layer is used to bond the first substrate and the second substrate to each other.
[0006] In one embodiment, the adhesive layer is also disposed on the left and right outer sides of the first recess.
[0007] In one embodiment, another substrate is provided with a plurality of second recesses, the first recesses and the second recesses being disposed opposite to each other; the first recesses and the second recesses simultaneously accommodate an adhesive layer.
[0008] In one embodiment, the projection areas of the first recess and the second recess along the thickness direction of the thin-film battery partially overlap.
[0009] In one embodiment, a plurality of the first recesses are arranged in pairs side by side, and the middle portion of the second recess is aligned with the connection point of the two first recesses.
[0010] In one embodiment, another substrate is provided with a plurality of third recesses, wherein the first recesses and the third recesses are arranged in the same direction; the adhesive layer is disposed between the two substrates, and the adhesive layer is located in the first recesses or the third recesses.
[0011] In one embodiment, the volume of the adhesive layer is larger than the pit area of the first recess, and a portion of the adhesive layer overflows outside the pit area of the first recess.
[0012] In one embodiment, after the first substrate and the second substrate are bonded together, the first recess is subjected to a compression process to expel the adhesive layer in the first recess to the outside of the recess area of the first recess.
[0013] In one embodiment, if one of the substrates is provided with a tab region, then the first recess is provided on the other substrate.
[0014] In one embodiment, several of the first recesses are connected end to end to form a curved structure.
[0015] The technical solution of this utility model involves providing a plurality of first recesses in at least one of the substrates, with the plurality of first recesses arranged in a ring around the circumference of the cell structure; simultaneously, an adhesive layer is provided in the first recesses, and the first substrate and the second substrate are bonded together by the adhesive layer. At this time, the adhesive layer of each first recess is combined to form a dot-matrix ring structure to form a ring-shaped adhesive frame structure. Unlike the prior art, in the above adhesive frame structure, because the adhesive layer is distributed in a dot-matrix ring structure, the amount of adhesive required is greatly reduced, thereby reducing adhesive waste. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A schematic diagram of one embodiment of the adhesive frame structure provided by this utility model;
[0018] Figure 2 A second schematic diagram of an embodiment of the adhesive frame structure provided by this utility model;
[0019] Figure 3 A third schematic diagram of an embodiment of the adhesive frame structure provided by this utility model;
[0020] Figure 4 A fourth schematic diagram of an embodiment of the adhesive frame structure provided by this utility model;
[0021] Figure 5 A structural schematic diagram of an embodiment of the adhesive frame structure provided by this utility model is shown in Figure 5.
[0022] Figure 6 A schematic diagram of an embodiment of the adhesive frame structure provided by this utility model is shown in Figure 6.
[0023] Figure 7 A structural schematic diagram of an embodiment of the glue frame structure provided by this utility model is shown in Figure 7.
[0024] Figure 8 A schematic diagram of an embodiment of the adhesive frame structure provided by this utility model, shown in Figure 8.
[0025] Figure 9 A structural schematic diagram of an embodiment of the adhesive frame structure provided by this utility model, shown in Figure 9;
[0026] Figure 10 A schematic diagram of one embodiment of the adhesive frame structure provided by this utility model is shown below.
[0027] Explanation of reference numerals in the attached figures:
[0028] 10. Substrate; 20. Cell structure; 30. First recess; 40. Adhesive layer; 50. Frame structure; 60. Second recess; 70. Third recess; 80. Tab area
[0029] 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
[0030] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, what is described is only a part of the embodiments of this utility model, and not all of the embodiments. 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.
[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0032] Furthermore, it should be noted that the descriptions involving "first," "second," etc., in this utility model are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If 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.
[0033] In existing technologies, adhesive bonding is widely used because it has low temperature requirements and the sealing performance of the annular frame structure formed by adhesive bonding is good. However, adhesive bonding still has some drawbacks, such as the large amount of adhesive wasted in the annular frame structure and the electrolyte flowing out from the inside due to uneven printing of the frame.
[0034] To solve the above-mentioned technical problems, this utility model proposes a frame structure for a thin-film battery.
[0035] Please see Figure 1 In one embodiment of the present invention, the adhesive frame structure 50 includes two substrates 10 disposed opposite to each other and a battery cell structure 20 located between the two substrates 10; specifically, at least one substrate 10 is provided with a plurality of first recesses 30, and the first recesses 30 are located on opposite sides of the two substrates 10; the plurality of first recesses 30 are arranged in a ring around the circumference of the battery cell structure 20; the first recesses 30 are used to accommodate an adhesive layer 40, wherein the adhesive layer 40 is used to bond the first substrate 10 and the second substrate 10 to each other.
[0036] The technical solution of this utility model involves providing a plurality of first recesses 30 on at least one substrate 10, with the plurality of first recesses 30 arranged in a ring around the circumference of the cell structure 20; simultaneously, an adhesive layer 40 is provided in the first recesses 30, and the first substrate 10 and the second substrate 10 are bonded together by the adhesive layer 40. At this time, the adhesive layer 40 of each first recess 30 is combined to form a dot-matrix ring structure to form a ring-shaped adhesive frame structure 50. Unlike the prior art, the adhesive layer 40 in the above-mentioned adhesive frame structure 50 is distributed in a dot-matrix ring structure, which greatly reduces the amount of adhesive required, thereby reducing adhesive loss. In addition, when the electrolyte is squeezed and may leak, the structure of the adhesive and the recesses can play a certain blocking role, thereby preventing battery leakage.
[0037] The adhesive layer 40 can be pre-set on one of the bases 10 where the first recess 30 is located, or on another base 10 where the first recess 30 is not located. This application does not limit this. In this way, since the adhesive layer 40 only needs to be set on one of the bases 10, the amount of adhesive required can be reduced, thereby reducing adhesive waste.
[0038] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 2 Furthermore, the adhesive layer 40 is also disposed on the left and right outer sides of the first recess 30. This arrangement, by simultaneously disposing of the adhesive layer 40 on the left and right outer sides of the first recess 30, together with the adhesive layer 40 within the first recess 30, forms a toothed reinforcing structure, which can further and effectively prevent electrolyte leakage.
[0039] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 3 Another substrate 10 is provided with a plurality of second recesses 60, with the first recesses 30 and the second recesses 60 facing each other; both the first recesses 30 and the second recesses 60 simultaneously accommodate adhesive layers 40. With this configuration, by providing the first recesses 30 and the second recesses 60 on the two substrates 10 respectively, and with the first recesses 30 and the second recesses 60 facing each other, and since both the first recesses 30 and the second recesses 60 simultaneously accommodate adhesive layers 40, when the thin-film battery is encapsulated, the adhesive layers 40 in the first recesses 30 and the second recesses 60 are pressed against each other, and at the same time, the outer sides of the first recesses 30 and the second recesses 60 diffuse, thereby enhancing the bonding strength of the adhesive frame structure 50 formed by the adhesive layers 40 in the first recesses 30 and the second recesses 60.
[0040] Further, see Appendix Figure 4 The projection areas of the first recess 30 and the second recess 60 along the thickness direction of the thin-film battery partially overlap. As an improvement to the above embodiment, this embodiment achieves this by having the projection areas of the first recess 30 and the second recess 60 along the thickness direction of the thin-film battery partially overlap. Specifically, the first recess 30 and the second recess 60 are arranged in a staggered, opposing manner, causing their recess positions to partially overlap. This increases the area of the adhesive frame structure 50 formed by the adhesive layer 40 without increasing the adhesive layer 40, thereby preventing electrolyte diffusion.
[0041] Further, see attached document. Figure 5Several first recesses 30 are arranged in pairs side by side, with the middle of a second recess 60 aligned with the connection point of the two first recesses. This arrangement, with two first recesses 30 corresponding to one second recess 60, creates a toothed interlocking structure between the two first recesses 30 and the second recess 60 after the thin-film battery is encapsulated, which improves the mechanical properties of the thin-film battery. Understandably, because the toothed interlocking structure between the two first recesses 30 and the second recess 60 makes it difficult to separate the two substrates 10, thereby achieving the goal of improving the mechanical properties of the thin-film battery.
[0042] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 6 Another substrate 10 is provided with a plurality of third recesses 70, with the first recesses 30 and the third recesses 70 arranged in the same direction; an adhesive layer 40 is disposed between the two substrates 10, and the adhesive layer 40 is located in either the first recess 30 or the third recess 70. This arrangement allows the protrusions of the first recesses 30 and the recesses of the third recesses 70 to interlock, making it difficult for the two substrates 10 to separate, thereby improving the mechanical properties of the thin-film battery.
[0043] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 7 The volume of the adhesive layer 40 is larger than the pit area of the first recess 30, and part of the adhesive layer 40 overflows outside the pit area of the first recess 30. This arrangement ensures that after the thin-film battery is encapsulated, the adhesive layer 40 will overflow outside the pit area of the first recess 30, thereby increasing the area of the adhesive frame structure 50 formed by the adhesive layer 40, which helps to prevent the diffusion of the electrolyte.
[0044] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 8 After the first substrate 10 and the second substrate 10 are bonded together, the first recess 30 is compressed to push the adhesive layer 40 in the first recess 30 to the outside of the recess area. This arrangement allows the first recess 30 to be compressed after the thin-film battery is encapsulated, i.e., after the first substrate 10 and the second substrate 10 are bonded together, thereby increasing the area of the adhesive frame structure 50 formed by the adhesive layer 40 and helping to prevent electrolyte diffusion.
[0045] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 9If one base 10 has a tab region 80, then the first recess 30 is disposed on the other base 10. Understandably, since one base 10 has a tab region 80, the base 10 cannot be punched to form several first recesses 30, otherwise the tab region 80 will be damaged; therefore, the first recesses 30 need to be disposed on the other base 10 to protect the tab region 80 while smoothly setting the frame structure 50.
[0046] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 10 Several first recesses 30 are connected end-to-end to form a curved structure. With this configuration, as mentioned above, the adhesive layers 40 of each first recess 30 are combined in a dot-matrix ring structure to form a ring-shaped adhesive frame structure 50. To increase the tightness between the adhesive layers 40 in adjacent first recesses 30, thereby increasing the density of the adhesive layers 40 in the adhesive frame structure 50 and further preventing electrolyte penetration from the adhesive frame structure 50, this embodiment uses a series of first recesses 30 connected end-to-end to form a curved structure, thus maximizing the tightness between the adhesive layers 40 in adjacent first recesses 30.
[0047] It should be noted that other aspects of the frame structure for thin-film batteries disclosed in this utility model are prior art and will not be described in detail here.
[0048] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any application of this utility model directly or indirectly in other related technical fields is included within the patent protection scope of this utility model.
Claims
1. A frame structure for a thin-film battery, wherein the thin-film battery includes two substrates disposed opposite to each other and a cell structure located between the two substrates; Its features are, At least one of the substrates is provided with a plurality of first recesses, and the first recesses are located on opposite sides of the two substrates; the plurality of first recesses are arranged in a ring around the circumference of the cell structure; the two substrates are respectively defined as a first substrate and a second substrate, the first recesses being used to accommodate an adhesive layer, wherein the adhesive layer is used to bond the first substrate and the second substrate to each other.
2. The frame structure as described in claim 1, characterized in that: The adhesive layer is also disposed on the left and right outer sides of the first recess.
3. The frame structure as described in claim 1, characterized in that: Another substrate is provided with a plurality of second recesses, the first recesses and the second recesses being disposed opposite to each other; the first recesses and the second recesses simultaneously accommodate an adhesive layer.
4. The frame structure as described in claim 3, characterized in that: The projection areas of the first and second recesses along the thickness direction of the thin-film battery partially overlap.
5. The frame structure as described in claim 3, characterized in that: Several first recesses are arranged in pairs side by side, and the middle part of the second recess is aligned with the connection point of the two first recesses.
6. The frame structure as described in claim 1, characterized in that: Another substrate is provided with a plurality of third recesses, wherein the first recesses and the third recesses are arranged in the same direction; the adhesive layer is disposed between the two substrates, and the adhesive layer is located in the first recesses or the third recesses.
7. The frame structure as described in claim 1, characterized in that: The volume of the adhesive layer is larger than the pit area of the first recess, and part of the adhesive layer overflows outside the pit area of the first recess.
8. The frame structure as described in claim 1, characterized in that: After the first substrate and the second substrate are bonded together, the first recess is squeezed to push the adhesive layer in the first recess to the outside of the recess area.
9. The frame structure as described in claim 1, characterized in that: If one of the substrates is provided with a tab region, then the first recess is provided on the other substrate.
10. The frame structure as described in claim 1, characterized in that: Several of the first recessed portions are connected end to end to form a curved structure.