Shell, battery pack and bonding structure

Abstract

The utility model relates to the technical field of battery bonding, and particularly discloses a shell, a battery pack and a bonding structure. The outer lining is installed on the shell body, and the material of the outer lining is the same as that of the shell body; wherein the external lining is provided with an accommodating cavity; the inner lining is fixedly mounted in the accommodating cavity and is used for being connected with a ground bonding fastener in a fastening manner; wherein the grounding fastener is used for fixing a grounding part on the shell, so that the grounding part is electrically connected to the shell body. According to the shell, the battery pack and the grounding structure provided by the utility model, the problem that the grounding failure is easily caused by galvanic corrosion of the existing grounding structure can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery grounding, and in particular to a shell, a battery pack and a grounding structure. Background Art

[0002] "Grounding" is a term used in electronics and electrical engineering to refer to the connection of a part of a circuit or device to a grounding system in order to provide a reference potential, which is usually considered to be zero voltage or zero potential.

[0003] Existing power batteries are usually grounded using a grounding wire. Specifically, one end of the grounding wire is connected to the grounding system, and the other end is fixed to the surface of the power battery housing using a grounding fastener such as a bolt. This grounding structure has the following problems:

[0004] First, the grounding wire is directly fixed to the surface of the shell through the grounding fasteners, so it is exposed to mud, sand, humidity and other environments for a long time; second, the shell, grounding wire and grounding fasteners are usually made of different materials; the humid environment and the different conductive materials lead to serious galvanic corrosion problems.

[0005] Due to the problem of galvanic corrosion, the position of the shell used to connect the grounding fasteners will be corroded first, causing the grounding fasteners and grounding wires to fall off, and then causing the grounding between the power battery and the entire vehicle to fail, seriously affecting the performance of the entire vehicle.

[0006] Therefore, it is necessary to improve the structure of the existing grounding machine to solve the problem that it is easy to fail in grounding due to galvanic corrosion.

[0007] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Utility Model Content

[0008] One purpose of the present invention is to provide a housing, a battery pack and a grounding structure that can effectively solve the problem that the existing grounding structure is prone to grounding failure due to galvanic corrosion.

[0009] To achieve the above objectives, the present invention provides a housing comprising:

[0010] Shell body;

[0011] An external bushing, the external bushing being mounted on the outer shell body and made of the same material as the outer shell body; wherein the external bushing is provided with an accommodating cavity;

[0012] An internal bushing is installed and fixed in the accommodating cavity and is used for fastening with a grounding fastener; wherein the grounding fastener is used for fixing a grounding component on the shell so that the grounding component is electrically connected to the shell body.

[0013] Optionally, the outer bushing includes a small diameter end and a large diameter end located below the small diameter end; wherein the diameter of the small diameter end is smaller than the diameter of the large diameter end;

[0014] The housing is provided with an upper mounting plate abutting against a circumferential surface of the small-diameter end and a lower mounting plate abutting against a circumferential surface of the large-diameter end.

[0015] Optionally, the upper mounting plate is provided with a small-diameter hole abutting against the circumferential surface of the small-diameter end;

[0016] The lower mounting plate is provided with a large-diameter hole that abuts against the circumferential surface of the large-diameter end.

[0017] Optionally, a stepped limiting surface is provided between the circumferential surfaces of the small diameter end and the large diameter end;

[0018] The stepped limiting surface is used to abut against the bottom surface of the upper mounting plate to limit the large-diameter end from passing through the small-diameter hole.

[0019] Optionally, the top surface of the small-diameter end is higher than the upper end opening position of the small-diameter hole.

[0020] Optionally, the openings of the small-diameter hole and the large-diameter hole are both provided with inclined surfaces that are inclined downward in a direction away from the outer bushing.

[0021] Optionally, a drainage groove is provided on the inclined surface and passes through the corresponding mounting plate from top to bottom.

[0022] On the other hand, a battery pack is provided, comprising any of the above-mentioned shells and a battery module installed in the shell.

[0023] On the other hand, a grounding structure is provided, comprising any one of the above-mentioned shells or the above-mentioned battery packs, a grounding component for grounding, and a grounding fastener for fixing the grounding component to the shell.

[0024] Optionally, the grounding component is a grounding wire or a grounding metal plate.

[0025] The beneficial effects of the present invention are: providing a housing, a battery pack and a grounding structure, wherein after the grounding component is fixed to the housing using a grounding fastener, the housing body can be grounded through the grounding component. In the above process:

[0026] On the one hand, the shell body and the outer bushing are made of the same material, thereby avoiding the galvanic corrosion problem caused by the different materials at the connection between the shell body and the outer bushing;

[0027] On the other hand, the inner bushing is located in the accommodating cavity, and external water vapor is difficult to directly contact the connection position between the inner bushing and the grounding fastener, thereby avoiding the problem of galvanic corrosion caused by the humid environment at the connection position between the inner bushing and the grounding fastener.

[0028] Therefore, the housing, battery pack, and grounding structure provided by the present invention can effectively solve the problem of grounding failure caused by galvanic corrosion in existing grounding structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a grounding structure provided in an embodiment;

[0031] Figure 2 A schematic diagram of the exterior of a housing provided in an embodiment;

[0032] Figure 3 A schematic cross-sectional view of a housing provided in an embodiment;

[0033] Figure 4 A schematic structural diagram of an outer bushing provided in an embodiment.

[0034] In the picture:

[0035] 100, housing; 200, grounding component; 300, grounding fastener;

[0036] 1. Housing body; 101. Upper mounting plate; 1011. Small-diameter hole; 102. Lower mounting plate; 1021. Large-diameter hole; 103. Inclined surface; 104. Drain groove;

[0037] 2. External bushing; 201. Accommodation cavity; 202. Small diameter end; 203. Large diameter end; 204. Step limit surface; 205. Avoidance groove;

[0038] 3. Internal bushing. DETAILED DESCRIPTION

[0039] References to "embodiments" in this utility model mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the utility model. The appearance of the term "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or relevance to other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the various embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0040] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The use of relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0041] In the description of this utility model, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0042] In the present invention, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0043] Without further restrictions, in the present invention, the words "include", "comprise", "have" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0044] Consistent with the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple," such as "multiple groups" and "multiple times," are also understood in this manner, unless otherwise specifically defined.

[0045] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present invention.

[0046] Unless otherwise expressly specified or limited, in the description of the embodiments of the present invention, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the technical field of the present invention, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0047] The utility model provides a shell, a battery pack and a grounding structure, which are suitable for application scenarios where the shell of the battery pack is grounded, and can effectively solve the problem that the existing grounding structure is prone to grounding failure due to galvanic corrosion.

[0048] See also Figure 1 The grounding structure provided in this embodiment includes a housing 100 or a battery pack, a grounding component 200 for grounding, and a grounding fastener 300 for fixing the grounding component 200 to the housing 100. Furthermore, the housing 100 is also a component of the battery pack. Specifically, the battery pack includes the housing 100 and a battery module installed in the housing 100.

[0049] See also Figure 2 and Figure 3 The shell 100 provided in this embodiment includes a shell body 1, an outer bushing 2, and an inner bushing 3.

[0050] The bottom surface of the outer bushing 2 is provided with a downwardly opening accommodating cavity 201, and the circumferential surface of the outer bushing 2 is welded and fixed to the outer shell body 1. It should be noted that the material of the outer bushing 2 is the same as that of the outer shell body 1 to avoid galvanic corrosion caused by the connection between the outer bushing 2 and the outer shell body 1 due to the different materials.

[0051] The inner bushing 3 is fixed in the accommodating cavity 201 by welding or interference fitting, and is provided with an internal threaded hole for fastening with the grounding fastener 300 so as to be fastened with the grounding fastener 300 .

[0052] In this embodiment, the grounding fastener 300 is used to fix the grounding component 200 on the housing 100 , so that the grounding component 200 is electrically connected to the shell body 1 .

[0053] In this embodiment, the grounding component 200 can directly contact the shell body 1, thereby completing the electrical connection between the grounding component 200 and the shell body 1; alternatively, the grounding component 200 can also be electrically connected to the shell body 1 through the grounding fastener 300, the internal bushing 3, and the external bushing 2 in sequence, which is not limited in this embodiment.

[0054] In this embodiment, the grounding member 200 is a grounding metal plate. Optionally, the grounding metal plate is provided with bolt holes for the grounding fasteners 300 to pass through. In this case, the grounding metal plate can cover the opening of the accommodating cavity 201 to prevent external liquid from entering the accommodating cavity 201 and corroding the internal liner 3.

[0055] In some other embodiments, the grounding component 200 may also be a grounding wire. In this case, a bolt with a larger head size may be selected as the grounding fastener 300. The large-sized bolt head is conducive to covering the opening of the accommodating cavity 201; or, a large-sized gasket may be added to cover the opening of the accommodating cavity 201.

[0056] The housing 100, battery pack, and grounding structure provided in this embodiment can be grounded by fixing the grounding component 200 to the housing 100 using the grounding fastener 300. In the above process:

[0057] On the one hand, the shell body 1 and the outer bushing 2 are made of the same material, thereby avoiding the galvanic corrosion problem caused by the different materials at the connection position between the shell body 1 and the outer bushing 2;

[0058] On the other hand, the internal bushing 3 is located in the accommodating cavity 201, and it is difficult for external water vapor to directly contact the connection position between the internal bushing 3 and the grounding fastener 300, thereby avoiding the problem of galvanic corrosion caused by the humid environment at the connection position between the internal bushing 3 and the grounding fastener 300.

[0059] Therefore, the housing 100, battery pack, and grounding structure provided by the present invention can effectively solve the problem of grounding failure caused by galvanic corrosion in existing grounding structures.

[0060] In this embodiment, Figure 3~Figure 4 The outer bushing 2 includes a small-diameter end 202 and a large-diameter end 203 located below the small-diameter end 202; the diameter of the small-diameter end 202 is smaller than the diameter of the large-diameter end 203; the housing 100 is provided with an upper mounting plate 101 that abuts the circumferential surface of the small-diameter end 202, and a lower mounting plate 102 that abuts the circumferential surface of the large-diameter end 203. Furthermore, the upper mounting plate 101 is provided with a small-diameter hole 1011 that abuts the circumferential surface of the small-diameter end 202; and the lower mounting plate 102 is provided with a large-diameter hole 1021 that abuts the circumferential surface of the large-diameter end 203.

[0061] Optionally, a stepped limiting surface 204 is provided between the circumferential surfaces of the small diameter end 202 and the large diameter end 203 ; the stepped limiting surface 204 is used to abut against the bottom surface of the upper mounting plate 101 to limit the large diameter end 203 from passing through the small diameter hole 1011 .

[0062] During installation, pass the small diameter end 202 through the large diameter hole 1021 and then insert it into the small diameter hole 1011, then push the outer bushing 2 until the stepped limit surface 204 abuts against the bottom surface of the upper mounting plate 101. When the outer bushing 2 can no longer be pushed, it means that it has been installed in place.

[0063] When the outer bushing 2 is installed, if the top surface of the small-diameter end 202 is lower than the upper opening of the small-diameter hole 1011, liquid will easily accumulate in the small-diameter hole 1011, thereby corroding the top surface of the small-diameter end 202. Therefore, in this embodiment, the top surface of the small-diameter end 202 is higher than the upper opening of the small-diameter hole 1011 to prevent liquid from accumulating on the top surface of the small-diameter end 202. Optionally, the top surface of the small-diameter end 202 is 1 mm to 2 mm higher than the upper opening of the small-diameter hole 1011.

[0064] Furthermore, the openings of the small-diameter hole 1011 and the large-diameter hole 1021 are each provided with an inclined surface 103 that slopes downwardly away from the outer bushing 2. The design of the inclined surface 103 prevents liquid from accumulating at the connection between the outer bushing 2 and the mounting plate, further reducing the risk of galvanic corrosion between the outer bushing 2 and the housing body 1.

[0065] Optionally, a drainage groove 104 is provided on the inclined surface 103 and runs through the corresponding mounting plate from top to bottom, so as to further ensure that the accumulated liquid on the inclined surface 103 can be drained smoothly, thereby avoiding the occurrence of liquid accumulation.

[0066] In this embodiment, in order to reduce the risk of galvanic corrosion between the outer shell body 1 and the outer bushing 2, the material of the outer bushing 2 remains consistent with the outer shell body 1, usually aluminum, such as AL6061-T6. However, the structural strength of aluminum is not high, and the thread is prone to stripping. In order to improve the installation reliability of the grounding fastener 300, in this embodiment, the structural strength of the inner bushing 3 is greater than that of the outer bushing 2. For example, it can be made of fine steel to avoid the occurrence of thread stripping due to insufficient structural strength.

[0067] Optional, see Figure 2 and Figure 4 The lower portion of the outer bushing 2 is also provided with an escape groove 205 for clamping the installation fixture, so that after the installation fixture clamps the outer bushing 2, the outer bushing 2 is installed into the housing 100. Furthermore, the escape groove 205 is aligned with the drainage groove 104 of the lower mounting plate 102 to provide more space for the installation fixture.

[0068] In summary, the housing 100, battery pack, and grounding structure provided in this embodiment have the following advantages:

[0069] (1) Effectively prevent galvanic corrosion

[0070] ① The shell body 1 and the outer bushing 2 are made of the same material, which avoids the galvanic corrosion problem caused by the different materials at the connection between the two;

[0071] ② The inner bushing 3 is located in the accommodating cavity 201 of the outer bushing 2. External moisture is unlikely to directly contact the connection between the inner bushing 3 and the grounding fastener 300, thus preventing galvanic corrosion at the connection due to a humid environment.

[0072] (2) Easy installation and accurate positioning

[0073] ① The outer bushing 2 includes a small diameter end 202 and a large diameter end 203. During installation, the small diameter end 202 is passed through the large diameter hole 1021 and then inserted into the small diameter hole 1011 until the stepped limit surface 204 abuts against the bottom surface of the upper mounting plate 101.

[0074] ② The avoidance groove 205 is aligned with the drainage groove 104 of the lower mounting plate 102 to provide more space for the installation fixture;

[0075] (3) Preventing fluid accumulation and reducing corrosion risk

[0076] ① The top surface of the small diameter end 202 is 1mm - 2mm higher than the upper end of the small diameter hole 1011 to prevent liquid from accumulating on the top surface of the small diameter end 202;

[0077] ② The openings of the small-diameter hole 1011 and the large-diameter hole 1021 are both provided with inclined surfaces 103, which prevents liquid from stagnating at the connection between the outer bushing 2 and the mounting plate, thereby reducing the risk of galvanic corrosion;

[0078] ③ A drainage groove 104 is provided on the inclined surface 103 to ensure that the accumulated liquid on the inclined surface 103 can be discharged smoothly, further avoiding the occurrence of liquid accumulation;

[0079] (4) Improve installation reliability

[0080] The inner bushing 3 is made of a material with greater structural strength than the outer bushing 2 (such as fine steel), which improves the installation reliability of the grounding fastener 300 and avoids thread stripping due to insufficient structural strength.

[0081] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A housing, characterized in that: include: Housing body (1); An external bushing (2), the external bushing (2) being mounted on the outer shell body (1), and the material of the external bushing (2) being the same as that of the outer shell body (1); wherein the external bushing (2) is provided with an accommodating cavity (201); An internal bushing (3) is installed and fixed in the accommodating cavity (201) and is used for fastening with a grounding fastener (300); wherein the grounding fastener (300) is used for fixing a grounding component (200) on the shell (100) so that the grounding component (200) is electrically connected to the shell body (1).

2. The housing according to claim 1, wherein: The outer bushing (2) comprises a small diameter end (202) and a large diameter end (203) located below the small diameter end (202); wherein the diameter of the small diameter end (202) is smaller than the diameter of the large diameter end (203); The housing (100) is provided with an upper mounting plate (101) abutting against the circumferential surface of the small-diameter end (202), and a lower mounting plate (102) abutting against the circumferential surface of the large-diameter end (203).

3. The housing according to claim 2, wherein: The upper mounting plate (101) is provided with a small-diameter hole (1011) abutting against the circumferential surface of the small-diameter end (202); The lower mounting plate (102) is provided with a large-diameter hole (1021) abutting against the circumferential surface of the large-diameter end (203).

4. The housing according to claim 3, wherein: A stepped limiting surface (204) is provided between the circumferential surfaces of the small-diameter end (202) and the large-diameter end (203); The stepped limiting surface (204) is used to abut against the bottom surface of the upper mounting plate (101) to limit the large-diameter end (203) from passing through the small-diameter hole (1011).

5. The housing according to claim 3, wherein: The top surface of the small-diameter end (202) is higher than the upper end opening position of the small-diameter hole (1011).

6. The housing according to claim 3, wherein: The openings of the small-diameter hole (1011) and the large-diameter hole (1021) are both provided with inclined surfaces (103) that are inclined downward in a direction away from the outer bushing (2).

7. The housing according to claim 6, wherein: The inclined surface (103) is provided with a drainage groove (104) that passes through the corresponding mounting plate from top to bottom.

8. A battery pack, characterized in that: It comprises the housing (100) according to any one of claims 1 to 7, and a battery module installed in the housing (100).

9. A grounding structure, characterized in that: The invention comprises the shell (100) according to any one of claims 1 to 7 or the battery pack according to claim 8, a grounding component (200) for grounding, and a grounding fastener (300) for fixing the grounding component (200) to the shell (100).

10. The grounding structure according to claim 9, characterized in that: The grounding component (200) is a grounding wire or a grounding metal plate.

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