Ultra-thin battery

Abstract

The utility model discloses an ultra-thin battery which comprises a battery cell, an FPC (Flexible Printed Circuit) and a protection plate, first insulating gummed paper is adhered to the periphery of the battery cell; the FPC comprises a first connecting part and a second connecting part which are integrally formed and connected, the first connecting part is welded with the welding part, the second connecting part extends front and back, and the lower surface of the front end of the second connecting part is provided with an interface. The front end of the battery cell extends forwards to form the welding part, the FPC is positioned in front of the battery cell, and the first connecting part is welded with the welding part, so that the thickness of a finished battery product is controlled not to exceed the thickness of the battery cell, the production process sequence can be reduced, the production cost is reduced, and the use requirement of a customer on a thickness space of ultrathin equipment can be met; the FPC is connected with the battery cell, the protective plate is attached and fixed to the upper surface of the first connecting part, and the reinforcing piece is arranged on the upper surface of the front end of the second connecting part, so that the total thickness of the FPC and the protective plate is reduced, the overall structure is thin, the FPC is protected from being damaged, and the strength of the FPC can be maintained.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an ultra-thin battery. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloys as the positive / negative electrode materials and a non-aqueous electrolyte solution. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use require very strict environmental controls. However, with the development of science and technology, lithium-ion batteries have become the mainstream. Lithium-ion batteries can be broadly classified into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable.

[0003] Lithium-ion batteries are widely used in various electronic devices, especially thinner ones such as smartwatches and small tablets. Currently, most lithium-ion batteries consist of a cell and a PCB (PCB board). The PCB is relatively thick, and its stacking on the cell results in a high overall battery thickness, limiting its application. To meet requirements, the cell thickness must be reduced, leading to insufficient capacity in electronic devices. To address this issue, some manufacturers use a flexible printed circuit board (FPC) to connect to the cell, reducing the overall battery thickness. However, FPCs are weak and easily damaged, resulting in a short battery life. Therefore, it is necessary to improve existing thinner batteries. Utility Model Content

[0004] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide an ultra-thin battery that can effectively solve the problem that the FPC of existing thin batteries is weak, easily damaged, and thus has a short battery life.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An ultra-thin battery includes a cell, an FPC (Flexible Printed Circuit), and a protection board. The cell's periphery is covered with a first insulating adhesive film, and a welding portion extends forward from the front end of the cell. The FPC is located in front of the cell and includes an integrally formed first connecting portion and a second connecting portion. The first connecting portion extends laterally and is welded to the welding portion. The second connecting portion extends longitudinally, and a reinforcing member is provided on the upper surface of its front end, and an interface is provided on the lower surface of its front end. The protection board extends laterally and is fixed to the upper surface of the first connecting portion.

[0007] As a preferred embodiment, the battery cell consists of two cells arranged side by side.

[0008] As a preferred embodiment, the device further includes two parallel adhesive strips, which are respectively attached to the upper and lower surfaces of the two battery cells, with each parallel adhesive strip being attached to either the upper or lower surface of the two battery cells simultaneously.

[0009] As a preferred embodiment, the reinforcing member is a steel sheet.

[0010] As a preferred embodiment, it further includes a second insulating adhesive tape, which is applied to the protective plate and the first connecting portion.

[0011] As a preferred embodiment, it further includes a third insulating adhesive paper, which is applied over the second insulating adhesive paper and located at the junction of the first and second connecting portions.

[0012] As a preferred embodiment, the lower surface of the battery cell is covered with multiple easy-pull adhesive strips to facilitate the bonding and fixing of multiple batteries into a single battery module.

[0013] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0014] By extending a welding section forward from the front end of the battery cell, the FPC is located in front of the battery cell. The first connecting part is welded to the welding part, which controls the thickness of the finished battery to not exceed the thickness of the battery cell. This also reduces the number of production processes, lowers production costs, and meets the thickness space requirements of customers' ultra-thin equipment. Furthermore, by using the FPC to connect with the battery cell, the protection plate is attached and fixed to the upper surface of the first connecting part, and the front upper surface of the second connecting part is provided with a reinforcing member. This reduces the total thickness of the FPC and the protection plate, resulting in a thinner overall structure. It also protects the FPC from damage and maintains the strength of the FPC.

[0015] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments: Attached Figure Description

[0016] Figure 1 This is a three-dimensional assembly diagram of a preferred embodiment of the present invention;

[0017] Figure 2 This is a three-dimensional assembly schematic diagram of a preferred embodiment of the present invention from another angle;

[0018] Figure 3 This is an exploded view of a preferred embodiment of the present invention;

[0019] Figure 4 This is a partial assembly diagram of a preferred embodiment of the present invention.

[0020] Explanation of reference numerals in the attached diagram:

[0021] 10. Battery cell 11. Welding section

[0022] 20. FPC 21. First connecting part

[0023] 22. Second connecting part; 23. Reinforcing member

[0024] 30. Protective board; 41. First insulating tape

[0025] 42. Easy-pull adhesive tape 43. Parallel adhesive tape

[0026] 44. Second insulating tape 45. Third insulating tape Detailed Implementation

[0027] Please refer to Figures 1 to 4 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including a battery cell 10, an FPC 20, and a protection board 30.

[0028] The periphery of the battery cell 10 is covered with a first insulating adhesive tape 41, and the front end of the battery cell 10 extends forward with a welding part 11. In this embodiment, there are two battery cells 10, which are arranged side by side. In addition, the lower surface of the battery cell 10 is covered with multiple easy-pull adhesive tapes 42, which facilitates the bonding and fixing of multiple batteries to form a battery module.

[0029] The FPC20 is located in front of the cell 10. The FPC20 includes a first connecting part 21 and a second connecting part 22 integrally formed and connected. The first connecting part 21 extends to the left and right and is welded to the welding part 11. The second connecting part 22 extends to the front and back, and a reinforcing member 23 is provided on the upper surface of the front end of the second connecting part 22, and an interface 24 is provided on the lower surface of the front end of the second connecting part 22. In this embodiment, the reinforcing member 23 is a steel sheet.

[0030] The protective plate 30 extends to the left and right and is attached to the upper surface of the first connecting part 21.

[0031] Furthermore, it includes two parallel adhesive tapes 43, which are respectively attached to the upper and lower surfaces of the two battery cells 10, with each parallel adhesive tape 43 simultaneously attached to either the upper or lower surface of the two battery cells 10; in addition, this embodiment further includes a second insulating adhesive tape 44 and a third insulating adhesive tape 45, with the second insulating adhesive tape 44 attached to the protective plate 30 and the first connecting portion 21, and the third insulating adhesive tape 45 attached to the second insulating adhesive tape 44 and located at the connection between the first connecting portion 21 and the second connecting portion 22.

[0032] The key design feature of this invention is that by extending a welding section forward from the front end of the battery cell, with the FPC located in front of the battery cell, and welding the first connecting part to the welding section, the thickness of the finished battery is controlled to not exceed the thickness of the battery cell. This also reduces the number of production processes, lowers production costs, and meets the thickness and space requirements of customers' ultra-thin equipment. Furthermore, by using the FPC to connect to the battery cell, with the protection plate attached and fixed to the upper surface of the first connecting part, and a reinforcing member provided on the upper surface of the front end of the second connecting part, the total thickness of the FPC and the protection plate is reduced, resulting in a thinner overall structure. This also protects the FPC from damage and maintains its strength.

[0033] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An ultra-thin battery, characterized in that: The device includes a battery cell, an FPC (Flexible Printed Circuit), and a protection board. The battery cell is covered with a first insulating adhesive film around its periphery, and a welding portion extends forward from its front end. The FPC is located in front of the battery cell and includes an integrally formed first connecting portion and a second connecting portion. The first connecting portion extends laterally and is welded to the welding portion. The second connecting portion extends longitudinally, and a reinforcing member is provided on the upper surface of its front end, and an interface is provided on the lower surface of its front end. The protection board extends laterally and is fixed to the upper surface of the first connecting portion.

2. The ultra-thin battery according to claim 1, characterized in that: The battery cell consists of two cells, which are arranged side by side.

3. The ultra-thin battery according to claim 2, characterized in that: It further includes two parallel adhesive tapes, which are respectively attached to the upper and lower surfaces of the two cells, with each parallel adhesive tape being attached to either the upper or lower surface of the two cells simultaneously.

4. The ultra-thin battery according to claim 1, characterized in that: The reinforcing element is a steel sheet.

5. The ultra-thin battery according to claim 1, characterized in that: It further includes a second insulating tape, which is applied to the protective plate and the first connecting part.

6. The ultra-thin battery according to claim 5, characterized in that: It further includes a third insulating adhesive paper, which is applied over the second insulating adhesive paper and located at the junction of the first and second connecting portions.

7. The ultra-thin battery according to claim 1, characterized in that: The lower surface of the battery cell is covered with multiple easy-pull adhesive strips.

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