Detachable battery pack

Abstract

The present invention relates to a battery pack comprising: an electrode assembly; electrode leads extending from the electrode assembly; and a battery case including an accommodating portion for accommodating the electrode assembly and a sealing portion sealed along the edge of the accommodating portion, wherein a part of the sealing portion is elongated to form a handle part.

Description

Detachable battery pack

[0001] This application claims the benefit of priority to Korean Patent Application No. 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 detachable battery pack.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] Recently, in Europe and the United States, there is a growing need for designs that allow consumers to easily replace battery packs due to the consumer right to replace parts of IT products.

[0007] In the past, there was a problem in that additional materials and processes were required to manufacture a lifting film for a battery pack and apply adhesive to the lifting film, thereby increasing manufacturing costs.

[0008]

[0009] (Prior art literature)

[0010] (Patent Document 1) Korean Patent Publication No. 10-2022-0110994

[0011]

[0012] In order to solve the above problems, the purpose is to provide a battery pack that can be detached from the product.

[0013]

[0014] As a technical means for achieving the above purpose, a battery pack according to one embodiment of the present invention includes a battery case (120) including an electrode assembly; an electrode lead (110) extending from the electrode assembly; and a receiving portion (121) for receiving the electrode assembly and a sealing portion (122) sealed along the edge of the receiving portion (121), wherein a part of the sealing portion (122) is extended long to form a handle portion (130).

[0015] In addition, in a battery pack according to one embodiment of the present invention, an adhesive is coated on the outer surface of the receiving portion (121).

[0016] In addition, in the battery pack according to one embodiment of the present invention, the handle portion (130) is characterized by including a first handle portion (131) that extends long from the sealing portion (122) and is attached to one surface of the receiving portion (121).

[0017] In addition, in a battery pack according to one embodiment of the present invention, the first handle portion (131) is characterized in that it is coated with an adhesive.

[0018] In addition, in a battery pack according to one embodiment of the present invention, it is characterized in that the first edge portion (131a) of the first handle portion (131) is not coated with an adhesive.

[0019] In addition, in a battery pack according to one embodiment of the present invention, the first edge portion (131a) of the first handle portion (131) is characterized in that an adhesive is coated.

[0020] In addition, in a battery pack according to one embodiment of the present invention, a first groove (121a) having an engraved shape corresponding to the first handle portion (131) is formed in an area of ​​one side of the receiving portion (121) to which the first handle portion (131) is attached.

[0021] In addition, in the battery pack according to one embodiment of the present invention, the handle portion (130) is characterized in that it includes a second handle portion (132) that extends long from the sealing portion (122) and is attached to the other surface of the receiving portion (121).

[0022] In addition, in a battery pack according to one embodiment of the present invention, the second handle portion (132) is characterized in that it is coated with an adhesive.

[0023] In addition, in a battery pack according to one embodiment of the present invention, the second edge portion (132a) of the second handle portion (132) is characterized in that no adhesive is coated.

[0024] In addition, in a battery pack according to one embodiment of the present invention, the second edge portion (132a) of the second handle portion (132) is characterized in that no adhesive is coated.

[0025] In addition, in the battery pack according to one embodiment of the present invention, a second groove (121b) having an engraved shape corresponding to the second handle portion (132) is formed in an area of ​​the other surface of the receiving portion (121) to which the second handle portion (132) is attached.

[0026] In addition, the battery pack according to one embodiment of the present invention is characterized in that it can be attached to a product (200).

[0027] In addition, the battery pack according to one embodiment of the present invention is characterized in that it can be detached from the product (200) by the handle portion (130).

[0028]

[0029] As described above, according to the battery pack according to the present invention, the battery pack can be removed from the product by pulling the battery pack from the product through the handle portion extended from the sealing portion.

[0030]

[0031] Figure 1 is a perspective view for explaining a battery pack according to the first embodiment of the present invention.

[0032] Figure 2 is a plan view for explaining a battery pack according to the first embodiment of the present invention.

[0033] Fig. 3 is a cross-sectional view illustrating a battery pack according to the first embodiment of the present invention.

[0034] Fig. 4 is a cross-sectional view illustrating a battery pack according to the second embodiment of the present invention.

[0035]

[0036] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0037] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0038]

[0039] Hereinafter, a battery pack according to the present invention (hereinafter referred to as “the battery pack”) will be described.

[0040] FIG. 1 is a perspective view for explaining a battery pack according to the first embodiment of the present invention, FIG. 2 is a plan view for explaining a battery pack according to the first embodiment of the present invention, and FIG. 3 is a cross-sectional view for explaining a battery pack according to the first embodiment of the present invention.

[0041] First, referring to FIGS. 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 (130).

[0042] The electrode assembly (not shown) may be formed of, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped cathodes and anodes and then rolled up, a stack type electrode assembly having unit cells in which rectangular cathodes and anodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separator film, or a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0043] The positive electrode is composed of a positive electrode current collector and a positive electrode active material applied to the upper and lower surfaces of the positive electrode current collector.

[0044] The positive electrode current collector can generally have a thickness of 3 to 500 μm. There are no particular limitations on the material as long as it has high conductivity and does not cause 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. In addition, in order to increase the adhesive strength of the positive electrode active material, the surface can be formed with fine irregularities, or various shapes such as films, sheets, foils, nets, porous bodies, foams, and non-woven bodies are possible.

[0045] Meanwhile, the positive electrode active material may be mixed with a conductive agent and a binder, and fillers may be added as needed.

[0046] The negative electrode is composed of a negative electrode current collector and a negative electrode active material applied to the lower and upper surfaces of the negative electrode current collector.

[0047] The negative electrode current collector is typically made to have a thickness of 3 to 500 μm. There are no particular limitations on the negative electrode current collector as long as it is conductive and does not cause chemical changes in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface-treated with carbon, nickel, charcoal, silver, etc., aluminum-cadmium alloy, etc. can be used.

[0048] In addition, the bonding strength of the negative electrode active material can be strengthened by forming fine irregularities on the surface, and it can be used in various forms such as films, sheets, foils, nets, porous bodies, foams, and non-woven fabrics.

[0049] Of course, a conductive material and a binder can be additionally mixed with the negative electrode active material and coated on the negative electrode current collector.

[0050] The separator prevents shorting between the aforementioned negative electrode and positive electrode and only allows the movement of lithium ions. The material of the separator is preferably one selected from among polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0051]

[0052] The electrode lead (110) can be extended from the electrode assembly (not shown) and can be sealed by heat-sealing the sealing portion (122) using a sealing tool while being exposed to the outside of the sealing portion (122).

[0053] Additionally, the battery case (120) may include a receiving portion (121) that receives an electrode assembly (not shown) and a sealing portion (122) that is sealed along the edge of the receiving portion (121).

[0054] The battery case (120) can form a receiving portion (121) and a gas pocket portion using a laminate sheet composed of an outer covering layer, a metal layer, and an inner covering layer.

[0055] Since the inner covering layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0056] Materials for such inner covering layers may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferable.

[0057] The metal layer in contact with the inner covering layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0058] And the other side of the metal layer is provided with an outer covering layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance, and examples thereof include, but are not limited to, nylon or polyethylene terephthalate.

[0059]

[0060] The outer surface of the receiving portion (121) of the battery case (120) may be coated with an adhesive. Accordingly, the receiving portion (121) may be attached to the product (200).

[0061] Here, the adhesive may be provided as a double-sided tape having double-sided adhesiveness, but is not limited thereto, and may be provided as an adhesive that is obvious to those skilled in the art.

[0062] 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, one surface of the receiving portion (121) may be the lower surface (6 o'clock direction).

[0063] For example, the first handle portion (131) can be formed by removing the sealing portion (122) located on the side except for the central portion among the sealing portions (122) sealed along the edge of the receiving portion (121).

[0064] The first handle portion (131) can be attached by an adhesive coated on the outer surface of the receiving portion (121).

[0065] In the receiving portion (121), a first groove (121a) having an engraved shape corresponding to the first handle portion (131) may be formed on one side of the area to which the first handle portion (131) is attached.

[0066] In other words, the first home (121a) can be formed by being sunken into a shape corresponding to the first handle portion (131) from one side of the first handle portion (131).

[0067] Here, the fact that the first groove (121a) is formed in the shape of the first handle portion (131) may mean that the shape of the first groove (121a) on a plane corresponds to the shape of the first handle portion (131) on a plane, and that the depression height of the first groove (121a) is formed to correspond to the thickness of the first handle portion (131).

[0068] At this time, the first groove (121a) may be provided with a shape that corresponds to the size of the first handle portion (131) so that the first handle portion (131) can be secured therein, or a clearance space may be formed in consideration of reducing manufacturing errors and interference.

[0069] Meanwhile, the first handle portion (131) may be coated with an adhesive. In addition, the first edge portion (131a) of the first handle portion (131) may not be coated with an adhesive, or may be coated with a pressure-sensitive adhesive. Here, the pressure-sensitive adhesive is an adhesive having a lower adhesive strength than the adhesive.

[0070] For example, the first edge portion (131a) may be an area located closest to the sealing portion (122) in the first handle portion (131).

[0071] Referring to FIG. 3, the battery pack (100) may be attachable to a product (200). For example, the product (200) may be a mobile phone, but is not limited thereto, and it is desirable to understand that the product (200) encompasses all types of electronic devices in which the battery pack (100) is used.

[0072] This battery pack (100) can be attached to the product (200) by an adhesive coated on the outer surface of the receiving portion (121).

[0073] Additionally, the battery pack (100) can be detached from the product (200) by the handle (130).

[0074] For example, the battery pack (100) attached to the product (200) by the outer surface of the receiving portion (121) may be detached from the product (200) by the user by holding the first handle portion (131) by the first edge portion (131a) of the first handle portion (131) that is not coated with an adhesive or coated with an adhesive.

[0075]

[0076] Fig. 4 is a cross-sectional view illustrating a battery pack according to the second embodiment of the present invention.

[0077] Hereinafter, a battery pack according to the second embodiment of the present invention will be described with reference to FIG. 4. Referring to FIG. 4, the battery pack according to the second embodiment of the present invention is identical 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.

[0078] 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.

[0079] The second handle portion (132) may be extended from the sealing portion (122) and 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 upper surface (12 o'clock direction).

[0080] For example, the first handle part (131) may be formed to be attached to one surface of the receiving part (121), the second handle part (132) may be formed to be attached to the other surface of the receiving part (121), and the second handle part (132) may be formed to be positioned corresponding to the first handle part (131). That is, the second handle part (132) may be attached to the central portion of one side of the other surface of the receiving part (121).

[0081] Additionally, the second handle portion (132) can be attached by an adhesive coated on the outer surface of the receiving portion (121).

[0082] In addition, a second groove (121b) having an engraved shape corresponding to the second handle portion (132) may be formed in the area of ​​the other surface to which the second handle portion (132) is attached in the receiving portion (121).

[0083] In other words, the second home (121b) can be formed by being sunken into a shape corresponding to the second handle portion (132) from the other surface of the second handle portion (131).

[0084] Here, the fact that the second groove (121b) is formed in the shape of the second handle portion (132) may mean that the shape of the second groove (121b) on a plane corresponds to the shape of the second handle portion (132) on a plane, and that the depression height of the second groove (121b) is formed to correspond to the thickness of the second handle portion (132).

[0085] At this time, the second groove (121b) may be provided with a shape that corresponds to the size of the second handle portion (132) so that the second handle portion (132) can be secured therein, or a clearance space may be formed in consideration of reducing manufacturing errors and interference.

[0086] Meanwhile, the second handle portion (132) may be coated with an adhesive. In addition, the second edge portion (132a) of the second handle portion (132) may not be coated with an adhesive, or may be coated with a pressure-sensitive adhesive.

[0087] For example, the second edge portion (132a) may be an area located closest to the sealing portion (122) in the second handle portion (132).

[0088]

[0089] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

[0090] (Explanation of symbols)

[0091] 100: Battery pack

[0092] 110: Electrode lead

[0093] 120: Battery case

[0094] 121: Reception area

[0095] 121a: 1st home 121b: 2nd home

[0096] 122: Sealing part

[0097] 130: Handle

[0098] 131: First handle part 131a: First edge part

[0099] 132: Second handle part 132a: Second edge part

[0100] 200: Product

Claims

1. Electrode assembly; an electrode lead extending from the electrode assembly; and A battery case including a receiving portion for receiving the electrode assembly and a sealing portion sealed along the edge of the receiving portion, A battery pack characterized in that some of the above sealing portions are extended to form a handle portion.

2. In paragraph 1, A battery pack characterized in that the outer surface of the above-mentioned receiving portion is coated with an adhesive.

3. In paragraph 2, The above handle part, A battery pack characterized by including a first handle portion that extends long from the sealing portion and is attached to one surface of the receiving portion.

4. In paragraph 3, A battery pack characterized in that the first handle portion is coated with an adhesive.

5. In paragraph 4, A battery pack characterized in that the first edge of the first handle portion is not coated with adhesive.

6. In paragraph 4, A battery pack characterized in that the first edge of the first handle portion is coated with an adhesive.

7. In paragraph 3, A battery pack characterized in that a first groove having an engraved shape corresponding to the first handle part is formed in an area of ​​one side of the receiving portion to which the first handle part is attached.

8. In paragraph 3, The above handle part, A battery pack characterized by including a second handle portion that extends long from the sealing portion and is attached to the other surface of the receiving portion.

9. In paragraph 8, A battery pack characterized in that the second handle portion is coated with an adhesive.

10. In paragraph 9, A battery pack characterized in that the second edge of the second handle portion is not coated with adhesive.

11. In paragraph 9, A battery pack characterized in that the second edge of the second handle portion is not coated with adhesive.

12. In paragraph 8, A battery pack characterized in that a second groove having an engraved shape corresponding to the second handle part is formed in an area of ​​the other surface of the receiving part to which the second handle part is attached.

13. In paragraph 3, A battery pack characterized by being attachable to a product.

14. In paragraph 3, A battery pack characterized in that it can be removed from the product by the handle portion.

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