Battery pack comprising cover having recess for sound-absorbing material

Abstract

The present invention relates to a battery pack comprising: one or more battery modules; a pack case body for accommodating the battery modules; a cover added to cover an open surface of the pack case body; and a sound absorption material disposed on the outer side surface of the cover, wherein a recess is formed on the outer side surface of the cover, and at least a portion of the sound absorption material is inserted into the recess. The present invention has, on the outer side surface of the cover, the recess into which at least a portion of the sound-absorbing material is inserted, and thus can stably fix the sound-absorbing material. Therefore, the transmission of noise to a driver and / or passenger of an electric vehicle to which the battery pack according to the present invention is mounted can be minimized, and the risk of damage to the battery pack caused by noise can be reduced.

Description

A battery pack including a cover with grooves formed for sound-absorbing material

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0175869 filed November 29, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0002] The present invention relates to a battery pack comprising a cover having grooves for sound-absorbing material. Specifically, it relates to a battery pack for an electric vehicle comprising a cover having grooves for sound-absorbing material so that sound-absorbing material can be stably attached.

[0003]

[0004] Among rechargeable batteries capable of repeated charging and discharging, lithium-ion batteries are seeing an expanding range of applications due to their advantages, such as high energy density and excellent lifespan characteristics.

[0005] As lithium secondary batteries are applied to devices requiring high voltage and high capacity energy sources, such as electric vehicles and energy storage devices, battery modules composed of multiple battery cells connected in series, parallel, or series and parallel, and battery packs composed of said battery modules connected again in series, parallel, or series and parallel are being manufactured and applied.

[0006] A battery pack for an electric vehicle may include a pack case body in which battery cells are accommodated, and a cover that covers the pack case body, and generally, the battery pack is positioned at the bottom of the vehicle. A flange portion to which a fastening member is coupled is formed on the outer periphery of the pack case body, and the battery pack can be fixed to the bottom of the vehicle by means of a fastening member attached to the flange. At this time, the cover that covers the pack case body is positioned to face the ground.

[0007] Continuous vibrations occur in electric vehicles due to various causes while driving. Since the battery pack is located at the bottom of the vehicle, vibrations from the road surface affect the battery pack. Furthermore, vibrations generated by the battery pack can be transmitted as noise or directly affect the underside of the vehicle.

[0008] The battery pack is attached so that the bottom of the pack case body contacts the floor of the vehicle. Since the bottom of the pack case body is relatively thin and has a large surface area, noise generated outside the vehicle can be transmitted to the floor of the vehicle and radiated into the vehicle interior.

[0009] Therefore, various attempts are being made to reduce noise transmitted to drivers and / or passengers.

[0010] Patent Document 1 includes a battery lower case, a battery pack assembly installed in the battery lower case, and a battery upper cover coupled to the battery lower case and disposed on the battery pack assembly, wherein a main pad for vibration damping for noise reduction is attached to the upper surface of the battery upper cover.

[0011] Patent Document 1 blocks noise generated by the battery device from being transmitted into the vehicle interior by configuring the main vibration damping pad to be placed between the vehicle floor and the battery device.

[0012] Meanwhile, in a battery pack attached to the floor of an electric vehicle, if the cover covering the pack case body is positioned to face the ground, a sound-absorbing material may be added to the cover.

[0013] FIG. 1 is a perspective view of a conventional battery pack.

[0014] Referring to FIG. 1, the battery pack (100) includes a pack case body (120) and a cover (110) covering the pack case body (120), and a sound-absorbing material (200) is attached to the top of the cover (110).

[0015] While electric vehicles are operated for decades and hundreds of thousands of kilometers, sound-absorbing materials must remain securely attached, but simply placing the sound-absorbing material on the battery pack cover does not guarantee that the material will not detach during operation.

[0016] Therefore, technology is required to securely fix the sound-absorbing material added to the battery pack cover, preventing it from detaching even during prolonged operation.

[0017]

[0018] (Prior Art Literature)

[0019] (Patent Document 1) Korean Published Patent Application No. 2024-0104684 (July 5, 2024)

[0020]

[0021]

[0022] The present invention aims to solve the above-mentioned problem by providing a battery pack comprising a cover having a groove for a sound-absorbing material formed therein so that when a sound-absorbing material is added to a battery pack cover positioned toward the ground, the sound-absorbing material can be maintained in a stably fixed state.

[0023]

[0024] A battery pack according to the present invention for achieving such an objective comprises one or more battery modules, a pack case body for housing the battery modules, a cover added to cover an open surface of the pack case body, and a sound-absorbing material disposed on the outer surface of the cover, wherein a groove is formed on the outer surface of the cover, and at least a portion of the sound-absorbing material may be inserted into the groove.

[0025] In the battery pack according to the present invention, the sound-absorbing material may be made of a material capable of compression deformation.

[0026] In the battery pack according to the present invention, 20% to 60% of the total thickness of the sound-absorbing material may be accommodated in the groove.

[0027] In the battery pack according to the present invention, the vertical cross-sectional area of ​​the groove may be smaller than the vertical cross-sectional area of ​​the sound-absorbing material.

[0028] In a battery pack according to the present invention, a protrusion for fixing the sound-absorbing material is formed on the inlet side of the groove, and the portion of the sound-absorbing material inserted into the groove can be fixed in position by the protrusion while in a compressed state.

[0029] In the battery pack according to the present invention, the sound-absorbing material can be fixed within the groove by means of an adhesive.

[0030] In the battery pack according to the present invention, the portion corresponding to the groove formed on the outer surface on the inner surface of the cover may be formed in a flat shape.

[0031] In the battery pack according to the present invention, the portion corresponding to the groove formed on the outer surface of the inner surface of the cover may be formed in a convex shape.

[0032] In the battery pack according to the present invention, the vertical cross-section of the groove may be polygonal, semicircular, or semi-elliptical.

[0033] In a battery pack according to the present invention, the groove includes an inlet side and an inner side, and in the cross-sectional area of ​​the groove, the width of the inlet side may be smaller than the maximum width of the inner side.

[0034] In the battery pack according to the present invention, the sound-absorbing material is composed of a unit body formed in a continuous, unbroken form, and one unit body may be attached to the cover, or two or more unit bodies may be attached.

[0035]

[0036] The present invention can also be provided in a form that combines various means for solving the above problem.

[0037]

[0038] The present invention allows the sound-absorbing material to be stably fixed by forming a groove on the outer surface of the cover into which at least a portion of the sound-absorbing material is inserted.

[0039] In addition, the fixing strength of the sound-absorbing material can be further increased by adding an adhesive to the above groove.

[0040] Therefore, the transmission of noise to the driver and / or passengers of an electric vehicle equipped with a battery pack according to the present invention can be minimized, and the risk of damage to the battery pack due to noise can be reduced.

[0041]

[0042] FIG. 1 is a perspective view of a conventional battery pack.

[0043] FIG. 2 is a perspective view of a battery pack according to the present invention.

[0044] Figure 3 is a partial enlarged view of the cross-section along A-A' of Figure 2.

[0045] Figure 4 is a vertical cross-sectional view illustrating the form in which a sound-absorbing material with a rectangular cross-section is added to a cover.

[0046] FIG. 5 is a vertical cross-sectional view illustrating a form in which a sound-absorbing material with a circular or polygonal cross-section is added to a cover.

[0047]

[0048] Embodiments that enable a person skilled in the art to easily practice the present invention are described in detail below with reference to the attached drawings. In describing the operating principles of the embodiments of the present invention in detail, specific descriptions of related known functions or configurations are omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention.

[0049] The same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected but also cases where they are indirectly connected with other elements in between. Furthermore, the inclusion of a certain component means that, unless specifically stated otherwise, it does not exclude other components but rather implies that additional components may be included.

[0050] Descriptions that specify components by limiting or adding them may be applied to all inventions unless specifically limited, and are not limited to descriptions of specific inventions.

[0051] Throughout the description of the invention and claims of this application, anything indicated in the singular includes cases where it is plural unless otherwise noted.

[0052] Throughout the description of the invention and the claims of the present invention, "or" includes "and" unless otherwise noted. Therefore, "comprising A or B" means all three of the above cases: including A, including B, or including both A and B.

[0053] The present invention is described in detail with reference to the drawings and embodiments.

[0054] FIG. 2 is a perspective view of a battery pack according to the present invention, and FIG. 3 is a partial enlarged view of a cross-section along A-A' of FIG. 2.

[0055] Referring to FIGS. 2 and 3, a battery pack (100) according to the present invention comprises one or more battery modules (not shown), a pack case body (120) that accommodates the battery modules, a cover (110) that is added to cover an open surface of the pack case body (120), and a sound-absorbing material (200) disposed on the outer surface of the cover (110). A groove (130) is formed on the outer surface of the cover (110), and at least a portion of the sound-absorbing material (200) is inserted into the groove (130).

[0056] The entire sound-absorbing material (200) can be inserted into the groove (130), and in FIG. 2, some of the sound-absorbing material (200) is positioned in a part other than the groove (130).

[0057] Referring to FIG. 3, the cover (110) has a concave groove (130) formed from the outer surface (112) toward the inner surface (111), and the depth of the groove (130) can be formed in a range of at least 10% to 60% of the thickness of the cover (110).

[0058] If the depth (D2) of the groove is less than 10% of the thickness (D1) of the cover (110), it is difficult to achieve the purpose of stably fixing the sound-absorbing material (200), and if it is greater than 60%, it is not suitable because the thickness of the cover becomes thinner, which may cause a problem of reduced rigidity.

[0059] Specifically, in FIG. 3(a), the portion corresponding to the groove formed on the outer surface (112) from the inner surface (111) of the cover (110) is formed in a flat shape, and in FIG. 3(b), the portion corresponding to the groove (130) formed on the outer surface (112) from the inner surface (111) of the cover (110) is formed in a convex shape, and at this time, the depth of the groove (D2) can be formed in a range of 10% to 60% with respect to the thickness (D1) of the cover (110) including the depth of the groove (113).

[0060] At this time, 20% to 60% of the total thickness of the sound-absorbing material (200) can be accommodated in the groove (130).

[0061] If the sound-absorbing material (200) is less than 20% of the total thickness, it is difficult to achieve the purpose of stably fixing the sound-absorbing material (200), and if it is more than 60%, it is not suitable because the amount of sound-absorbing material (200) inserted into the groove (130) becomes unnecessarily large.

[0062] In order to stably fix the sound-absorbing material (200) inside the groove (130), the sound-absorbing material (200) can be fixed inside the groove (130) by means of an adhesive (210). For example, the sound-absorbing material (200) can be inserted into the groove (130) after applying the adhesive (210) to the outer surface of the sound-absorbing material (200), or the sound-absorbing material (200) can be fixed by inserting it onto the adhesive (210) after applying the adhesive (210) inside the groove (130).

[0063] The vertical cross-section of the groove (130) may be polygonal, semicircular, or semi-elliptical, and FIG. 3 illustrates a groove (130) in which the vertical cross-section is in the shape of a square.

[0064] FIG. 4 is a vertical cross-sectional view illustrating a form in which a sound-absorbing material with a square cross-section is added to a cover, and FIG. 5 is a vertical cross-sectional view illustrating a form in which a sound-absorbing material with a circular or polygonal cross-section is added to a cover.

[0065] Referring to FIGS. 4 and 5, the sound-absorbing material (200) is made of a compressible material, and the vertical cross-sectional area of ​​the groove (130) is smaller than the vertical cross-sectional area of ​​the sound-absorbing material (200). Therefore, when the sound-absorbing material (200) is inserted into the groove (130), it is compressively deformed to fit the size of the groove (130), and the groove (130) is filled completely without any empty space by the part of the sound-absorbing material (200) inserted into the groove (130). In this way, since the part of the sound-absorbing material (200) is fitted into the groove (130) while in a compressed state, the sound-absorbing material (200) can be fixed inside the groove (130) without being detached.

[0066] Additionally, a protrusion (140) for fixing the sound-absorbing material (200) is formed on the entrance side of the groove (130), so that the sound-absorbing material (200) inserted into the groove (130) is further compressed by the protrusion (140). Therefore, since the part of the sound-absorbing material (200) inserted into the groove (130) is fixed in position by the protrusion (140) while in a compressed state, it can be fixed more stably in the groove (130).

[0067] Specifically, the groove (130) includes an entrance side and an interior side, and the width (W1) of the entrance side in the cross-sectional area of ​​the groove is configured to be smaller than the maximum width (W2) of the interior side. Accordingly, the part of the sound-absorbing material (200) inserted into the groove (130) is compressed to fit the interior size of the groove (130) and can be stably fixed by the protrusion (140) on the entrance side.

[0068] In addition, the sound-absorbing material (200) shown in FIGS. 4 and 5 can also be fixed within the groove (130) by an adhesive (210) as shown in FIG. 3.

[0069] Referring again to FIG. 2, in the battery pack (100) according to the present invention, the sound-absorbing material (200) is composed of a unit body formed in a continuous, unbroken form, and only one unit body may be attached to the outer surface of the cover (110), or two unit bodies may be attached to the cover (110) as in FIG. 2, or grooves may be formed in the cover (110) to allow two or more unit bodies to be added, and sound-absorbing materials suitable for each of the grooves may be attached.

[0070] The battery pack (100) may be a battery pack for an electric vehicle and may be fixed to the lower part of the vehicle.

[0071] As a structure for securing the battery pack to a vehicle, a connecting part (121) extending outward from the bottom of the pack case body (120) is provided. The battery pack can be secured to the lower part of the vehicle by inserting a fastening member, such as a bolt, into the connecting part (121) while the battery pack cover (110) is turned upside down so as to face the ground.

[0072] The battery pack according to the present invention can physically fix the sound-absorbing material by forming a groove in the cover for inserting the sound-absorbing material, and furthermore, can fix the sound-absorbing material using an adhesive, thereby minimizing the detachment of the sound-absorbing material from the cover.

[0073] Therefore, by eliminating noise generated from the ground while the vehicle is in operation, the noise transmitted into the vehicle interior can be reduced, and damage to the battery pack caused by noise can be minimized.

[0074]

[0075] A person skilled in the art to which the present invention pertains would be able to perform various applications and modifications within the scope of the present invention based on the above content.

[0076]

[0077]

[0078] (Explanation of symbols)

[0079] 100: Battery pack

[0080] 110: Cover

[0081] 111: Inner side

[0082] 112: Lateral surface

[0083] 120: Pack case main body

[0084] 130: Home

[0085] 140: Protrusion

[0086] 200: Sound-absorbing material

[0087] 210: Adhesive

[0088]

[0089]

Claims

1. One or more battery modules; A pack case body accommodating the above battery module; A cover added to cover the opening surface of the above-mentioned pack case body; and Sound-absorbing material disposed on the outer surface of the above cover; Includes, A battery pack in which a groove is formed on the outer surface of the above-mentioned cover, and at least a portion of the sound-absorbing material is inserted into the groove.

2. In Paragraph 1, The above sound-absorbing material is a battery pack made of a compression-deformable material.

3. In Paragraph 1, A battery pack in which 20% to 60% of the total thickness of the sound-absorbing material is accommodated in the groove.

4. In Paragraph 1, A battery pack in which the vertical cross-sectional area of ​​the above groove is smaller than the vertical cross-sectional area of ​​the above sound-absorbing material.

5. In Paragraph 4, A protrusion for fixing the sound-absorbing material is formed on the entrance side of the above-mentioned groove, and A battery pack in which the portion inserted into the groove of the above sound-absorbing material is fixed in position by the above protrusion while in a compressed state.

6. In Paragraph 1, The above sound-absorbing material is a battery pack fixed within the groove by an adhesive.

7. In Paragraph 1, A battery pack in which the portion corresponding to the groove formed on the outer surface of the inner surface of the cover is formed in a flat shape.

8. In Paragraph 1, A battery pack in which the portion corresponding to the groove formed on the outer surface of the inner surface of the cover is formed in a convex shape.

9. In Paragraph 1, A battery pack in which the vertical cross-section of the above-mentioned groove is polygonal, semicircular, or semi-elliptical.

10. In Paragraph 1, The above groove includes an entrance side and an interior side, and A battery pack in which the width of the entrance side in the cross-sectional area of ​​the above groove is smaller than the maximum width of the above inner side.

11. In Paragraph 1, The above sound-absorbing material is composed of unit bodies formed in an unbroken, continuous form, and A battery pack having one unit attached to the above cover, or two or more units attached.

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