Detachable battery pack

Abstract

The present invention relates to a battery pack including an electrode assembly, electrode leads extending from the electrode assembly, and a battery case including a housing that houses the electrode assembly and a sealing portion that is sealed along an edge of the housing, wherein a portion of the sealing portion extends elongatedly to form a handle.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0160908, filed November 20, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery pack, and more particularly to a removable battery pack. [Background technology]

[0003] As technological development and demand for mobile devices increases, rechargeable secondary batteries are being used as energy sources for various mobile devices. Secondary batteries are also attracting attention as energy sources for electric vehicles and hybrid electric vehicles, which are being proposed as alternatives to existing gasoline-powered vehicles and diesel-powered vehicles that use fossil fuels.

[0004] Depending on the shape of the battery case, secondary batteries are classified into cylindrical batteries and prismatic batteries, in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch batteries, in which the electrode assembly is housed in a pouch-shaped case made of an aluminum laminate sheet.

[0005] In recent years, in Europe, the United States, and other regions, consumers have the right to repair parts for IT products (RIGHT TO REPAIR), which has led to the need for designs that allow consumers to easily repair battery packs.

[0006] In the conventional method, a lifting film for a battery pack is additionally manufactured and an adhesive is applied to the lifting film, which requires additional materials and processes, resulting in an increase in manufacturing costs. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent Publication No. 10-2022-0110994 Summary of the Invention [Problem to be solved by the invention]

[0008] In order to solve the above problems, an object is to provide a battery pack that can be attached to and detached from a product. [Means for solving the problem]

[0009] As technical means for achieving the above object, a battery pack according to one embodiment of the present invention includes an electrode assembly, electrode leads (110) extending from the electrode assembly, a battery case (120) including a receiving portion (121) for receiving the electrode assembly and a sealing portion (122) sealed along the edge of the receiving portion (121), and a portion of the sealing portion (122) extends elongated to form a handle portion (130).

[0010] In addition, in the battery pack according to an embodiment of the present invention, the outer surface of the receiving portion (121) is coated with an adhesive.

[0011] In addition, in the battery pack according to one embodiment of the present invention, the handle portion (130) includes a first handle portion (131) extending from the sealing portion (122) and attached to one surface of the receiving portion (121).

[0012] In addition, in the battery pack according to one embodiment of the present invention, the first handle portion (131) is coated with adhesive.

[0013] In addition, in the battery pack according to one embodiment of the present invention, the first edge (131a) of the first handle (131) is not coated with adhesive.

[0014] In addition, in the battery pack according to one embodiment of the present invention, the first edge (131a) of the first handle (131) is coated with a dot adhesive.

[0015] In addition, in the battery pack according to one embodiment of the present invention, a first groove (121a) having an intaglio shape corresponding to the first handle portion (131) is formed in an area of ​​one surface of the receiving portion (121) to which the first handle portion (131) is attached.

[0016] In addition, in the battery pack according to one embodiment of the present invention, the handle portion (130) includes a second handle portion (132) that extends from the sealing portion (122) and is attached to another surface of the receiving portion (121).

[0017] In addition, in the battery pack according to one embodiment of the present invention, the second handle portion (132) is coated with an adhesive.

[0018] In addition, in the battery pack according to one embodiment of the present invention, the second edge (132a) of the second handle (132) is not coated with adhesive.

[0019] In addition, in the battery pack according to one embodiment of the present invention, the second edge (132a) of the second handle (132) is coated with a dot adhesive.

[0020] In addition, in the battery pack according to one embodiment of the present invention, a second groove (121b) having an intaglio shape corresponding to the second handle portion (132) is formed in the area of ​​the other surface of the receiving portion (121) to which the second handle portion (132) is attached.

[0021] The battery pack according to the embodiment of the present invention is characterized in that it can be attached to a product (200).

[0022] The battery pack according to the embodiment of the present invention is characterized in that it can be detached from the product (200) by the handle (130). [Effects of the Invention]

[0023] As described above, according to the battery pack of the present invention, the battery pack can be attached to and detached from the product by pulling the battery pack from the product via the handle extending from the sealing portion. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view illustrating a battery pack according to a first embodiment of the present invention. [Figure 2] 1 is a plan view illustrating a battery pack according to a first embodiment of the present invention. [Figure 3] 1 is a cross-sectional view illustrating a battery pack according to a first embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view illustrating a battery pack according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, with reference to the accompanying drawings, a detailed description will be given of an embodiment of the present invention that will enable a person skilled in the art to easily carry out the present invention. However, in describing the operation principle of the preferred embodiment of the present invention in detail, detailed description of related well-known functions or configurations will be omitted if it is determined that such detailed description may unnecessarily obscure the gist of the present invention.

[0026] Furthermore, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element therebetween. Furthermore, unless otherwise specified, "including a certain element" does not mean that other elements are excluded, but that other elements may also be included.

[0027] The battery pack according to the present invention (hereinafter referred to as "the present battery pack") will be described below.

[0028] FIG. 1 is a perspective view illustrating a battery pack according to a first embodiment of the present invention, FIG. 2 is a plan view illustrating a battery pack according to the first embodiment of the present invention, and FIG. 3 is a cross-sectional view illustrating a battery pack according to the first embodiment of the present invention.

[0029] First, referring to Figures 1 to 3, a battery pack according to a first embodiment of the present invention will be described. The battery pack 100 includes an electrode assembly (not shown), an electrode lead 110, a battery case 120, and a handle portion 130.

[0030] The electrode assembly (not shown) may be, but is not limited to, a jelly-roll type electrode assembly in which a separator is interposed between long sheet-shaped negative and positive electrodes and then wound up; a stack type electrode assembly composed of unit cells in which rectangular positive and negative electrodes are stacked with a separator between them; a stack folding type electrode assembly in which unit cells are wound up with a long separator film; or a lamination stack type electrode assembly in which unit cells are stacked with a separator between them and attached to each other.

[0031] The positive electrode includes a positive electrode current collector and a positive electrode active material applied to the upper and lower surfaces of the positive electrode current collector.

[0032] The positive electrode current collector generally has a thickness of 3 to 500 μm. It is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. can be used. Furthermore, to increase the adhesive strength of the positive electrode active material, the surface may be finely textured, or various forms such as a film, sheet, foil, net, porous material, foam, or nonwoven fabric may be used.

[0033] On the other hand, a conductive material and a binder can be mixed into the positive electrode active material, and a filler can also be added if necessary.

[0034] The negative electrode includes a negative electrode current collector and a negative electrode active material applied to the lower and upper surfaces of the negative electrode current collector.

[0035] The negative electrode current collector is generally manufactured to have a thickness of 3 to 500 μm. Such a negative electrode current collector is not particularly limited as long as it is conductive and does not cause chemical changes in the battery, and examples that can be used include copper, stainless steel, aluminum, nickel, titanium, baked carbon, copper or stainless steel surface-treated with carbon, nickel, titanium, silver, etc., and aluminum-cadmium alloys.

[0036] In addition, the bonding strength of the negative electrode active material can be strengthened by forming minute irregularities on the surface, and the negative electrode active material can be used in various forms such as a film, sheet, foil, net, porous material, foam, nonwoven fabric, etc.

[0037] Of course, the negative electrode active material may be further mixed with a conductive material and a binder and then coated on the negative electrode current collector.

[0038] The separator prevents short circuits between the negative and positive electrodes and allows only lithium ions to move. The separator may be made of any one of polyethylene, polypropylene, a polyethylene / polypropylene double layer, a polyethylene / polypropylene / polyethylene triple layer, a polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0039] The electrode lead 110 can extend from the electrode assembly (not shown) and can be sealed by heat sealing the sealing portion 122 with a sealing tool while exposed to the outside of the sealing portion 122.

[0040] The battery case 120 may also include a receiving portion 121 that receives an electrode assembly (not shown) and a sealing portion 122 that seals along the edge of the receiving portion 121 .

[0041] The battery case 120 can form the storage section 121 and the gas pocket section using a laminate sheet consisting of an outer coating layer, a metal layer, and an inner coating layer.

[0042] The inner coating layer must have insulating and electrolytic resistance because it is in direct contact with the electrode assembly, and must also have excellent sealing properties, i.e., excellent thermal adhesive strength at the sealing portions where the inner layers are thermally bonded together, to seal against the outside.

[0043] The material for such an inner coating layer is not limited, but can be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and sealing properties, polyurethane, and polyimide resin, but polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferred.

[0044] The metal layer in contact with the inner coating layer corresponds to a barrier layer that prevents moisture and various gases from penetrating into the interior of the battery from the outside, and a preferred material for such a metal layer is an aluminum thin film, which is lightweight yet has excellent formability.

[0045] An outer coating layer is provided on the other side of the metal layer. This outer coating layer may be made of a heat-resistant polymer having excellent tensile strength, moisture barrier properties, and air barrier properties to protect the electrode assembly and ensure heat resistance and chemical resistance. Examples of materials that may be used include, but are not limited to, nylon or polyethylene terephthalate.

[0046] The outer surface of the receiving portion 121 of the battery case 120 may be coated with adhesive, so that the receiving portion 121 can be attached to the product 200.

[0047] Here, the adhesive may be a double-sided adhesive tape having double-sided adhesive properties, but is not limited thereto, and may be any adhesive known to those skilled in the art.

[0048] The handle portion 130 may be formed by extending a portion of the sealing portion 122. The handle portion 130 may include a first handle portion 131 that extends from the sealing portion 122 and is attached to one surface of the receiving portion 121. With reference to FIG. 3, the one surface of the receiving portion 121 may be the bottom surface (6 o'clock direction).

[0049] For example, the first handle portion 131 may be formed by removing the sealing portion 122 located on the side of the sealing portion 122 sealed along the edge of the receiving portion 121, except for the central portion.

[0050] The first handle portion 131 can be attached to the outer surface of the receiving portion 121 by means of an adhesive coated thereon.

[0051] The receiving portion 121 may have a first groove 121a formed in an intaglio shape corresponding to the first handle portion 131 in a region of one surface to which the first handle portion 131 is attached.

[0052] In other words, the first groove 121 a may be recessed from one surface of the first handle portion 131 into a shape corresponding to the first handle portion 131 .

[0053] Here, the first groove 121a being formed in the shape of the first handle portion 131 may mean that the planar shape of the first groove 121a corresponds to the planar shape of the first handle portion 131, and the recessed height of the first groove 121a corresponds to the thickness of the first handle portion 131.

[0054] Here, the first groove 121a may be formed in a shape that corresponds to the size of the first handle portion 131 so that the first handle portion 131 can be seated, or that provides a play space that takes into consideration manufacturing errors and reduction of interference.

[0055] Meanwhile, adhesive may be coated on the first handle portion 131. Also, the first edge portion 131a of the first handle portion 131 may not be coated with adhesive or may be coated with a spot adhesive. Here, the spot adhesive is an adhesive having a lower adhesive strength than a glue.

[0056] For example, the first edge 131 a may be the area of ​​the first handle portion 131 that is located closest to the sealing portion 122 .

[0057] 3, the battery pack 100 can be attached to a product 200. For example, the product 200 can be a mobile phone, but is not limited thereto, and it is preferable to understand that the product 200 encompasses all types of electronic devices in which the battery pack 100 can be used.

[0058] The battery pack 100 can be attached to the product 200 by an adhesive coated on the outer surface of the housing portion 121 .

[0059] The battery pack 100 can be attached to and detached from the product 200 using the handle 130.

[0060] For example, the battery pack 100 is attached to the product 200 by the outer surface of the accommodating portion 121, and the first edge 131a of the first handle portion 131 is uncoated with adhesive or coated with a spot adhesive, allowing the user to grasp the first handle portion 131 to detach the battery pack 100 from the product 200.

[0061] FIG. 4 is a cross-sectional view illustrating a battery pack according to a second embodiment of the present invention.

[0062] A battery pack according to a second embodiment of the present invention will be described below with reference to Fig. 4. Referring to Fig. 4, the battery pack according to the second embodiment of the present invention is similar to the battery pack according to the first embodiment except for the configuration of the handle portion 130, and therefore only the different configurations will be described.

[0063] The handle portion 130 of the battery pack 100 according to the second embodiment of the present invention may include the first handle portion 131 and the second handle portion 132 described above.

[0064] The second handle portion 132 may extend from the sealing portion 122 and be attached to the other surface of the receiving portion 121. With reference to FIG. 5, the other surface of the receiving portion 121 may be the top surface (12 o'clock direction).

[0065] For example, the first handle portion 131 may be attached to one surface of the receiving portion 121, and the second handle portion 132 may be attached to the other surface of the receiving portion 121, with the second handle portion 132 being formed to be disposed at a position corresponding to the first handle portion 131. That is, the second handle portion 132 may be attached to the center of one side of the other surface of the receiving portion 121.

[0066] In addition, the second handle portion 132 can be attached to the outer surface of the storage portion 121 by means of an adhesive coated thereon.

[0067] In addition, the receiving portion 121 may have a second groove 121b formed in an intaglio shape corresponding to the second handle portion 132 in an area of ​​the other surface to which the second handle portion 132 is attached.

[0068] In other words, the second groove 121b may be formed by being recessed from the other surface of the second handle portion 132 into a shape corresponding to the second handle portion 132.

[0069] Here, the second groove 121b being formed in the shape of the second handle portion 132 may mean that the planar shape of the second groove 121b corresponds to the planar shape of the second handle portion 132, and the recessed height of the second groove 121b corresponds to the thickness of the second handle portion 132.

[0070] Here, the second groove 121b may be formed to correspond to the size of the second handle portion 132 so that the second handle portion 132 can be seated thereon, or may be formed to have a shape that provides a play space in consideration of manufacturing errors and reduction of interference.

[0071] On the other hand, the second handle portion 132 may be coated with adhesive, and the second edge 132a of the second handle portion 132 may be uncoated with adhesive or coated with a spot adhesive.

[0072] For example, the second edge 132 a may be the area of ​​the second handle portion 132 that is located closest to the sealing portion 122 .

[0073] Although specific portions of the present invention have been described in detail above, it will be apparent to those skilled in the art that such specific techniques are merely preferred embodiments and do not limit the scope of the present invention. It is possible to make various changes and modifications within the scope and technical spirit of the present invention, and it goes without saying that such changes and modifications are also included in the scope of the accompanying claims. [Explanation of symbols]

[0074] 100 battery packs 110 Electrode Lead 120 Battery Case 121 Storage unit 121a 1st groove 121b 2nd groove 122 Sealing part 130 Handle 131 First handle 131a First edge 132 Second handle 132a Second edge 200 products

Claims

1. an electrode assembly; an electrode lead extending from the electrode assembly; a battery case including a receiving portion that receives the electrode assembly and a sealing portion that is sealed along an edge of the receiving portion, A portion of the sealing portion extends to form a handle portion.

2. The battery pack according to claim 1 , wherein an outer surface of the housing portion is coated with an adhesive.

3. The battery pack according to claim 2 , wherein the handle portion includes a first handle portion extending elongately from the sealing portion and attached to one surface of the receiving portion.

4. The battery pack according to claim 3 , wherein the first handle portion is coated with an adhesive.

5. The battery pack according to claim 4 , wherein the first edge of the first handle portion is not coated with adhesive.

6. The battery pack according to claim 4 , wherein the first edge of the first handle portion is coated with a dot adhesive.

7. The battery pack of claim 3 , wherein a first groove having an intaglio shape corresponding to the first handle is formed in a region of the one surface of the receiving portion to which the first handle is attached.

8. The battery pack according to claim 3 , wherein the handle portion includes a second handle portion extending from the sealing portion and attached to another surface of the housing portion.

9. The battery pack according to claim 8 , wherein the second handle portion is coated with an adhesive.

10. The battery pack according to claim 9 , wherein the second edge of the second handle portion is not coated with adhesive.

11. The battery pack according to claim 9 , wherein the second edge of the second handle portion is coated with a dot adhesive.

12. The battery pack of claim 8 , wherein a second groove having an intaglio shape corresponding to the second handle is formed in a region of the other surface of the receiving portion to which the second handle is attached.

13. The battery pack of claim 3 , which is attachable to a product.

14. The battery pack according to claim 3 , wherein the battery pack is detachable from a product by means of the handle portion.

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