Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electric device, wherein battery pack includes battery box and battery group, battery group is set in battery box, and bearing mechanism is provided on battery box, and battery box is installed on electric device by bearing mechanism;Bearing mechanism at least includes bearing beam, bolt and bushing, bearing beam is connected with electric device by bolt, bushing is arranged between bearing beam and bolt, the diameter of stem of bolt is D, the inner diameter of bushing is d, the ratio of D / d is 0.5-0.95, and the stem of bolt is further coated with corrosion-resistant layer, and the length of corrosion-resistant layer is set to be greater than the length of bolt and bushing contact position.The battery pack can effectively improve the reliability of the connection between the battery pack and the electric device, avoid the battery pack from loosening or shifting, and thus protect the life safety of the vehicle and the personnel.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, and specifically relates to a battery pack and an electrical device. Background Technology

[0002] During battery pack assembly, bolts are typically used to secure the battery pack to the vehicle's load-bearing beams to ensure its stability during driving. However, because bolts and load-bearing beams are often made of different materials, this material difference can lead to electrochemical corrosion when they come into contact.

[0003] When the battery pack is in a complex operating environment, such as a humid atmosphere containing salt spray, or when it is exposed to rainwater erosion, bolts of different materials and load-bearing beams are prone to electrochemical corrosion under the action of electrolyte solution. Over time, the corroded bolts will experience problems such as decreased strength and damaged threads, which seriously affect the reliability of the connection between the battery pack and the load-bearing beam. It may even cause safety hazards such as loosening or displacement of the battery pack, thereby threatening the driving safety of the vehicle and the life safety of the people in the vehicle. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a battery pack that can effectively improve the reliability of the connection between the battery pack and the electrical device, and avoid the battery pack from becoming loose or shifting, thereby protecting the lives and safety of vehicles and people.

[0005] Another objective of this invention is to provide an electrical device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery pack includes a battery housing and a battery pack, wherein the battery pack is disposed in the battery housing, and a supporting mechanism is provided on the battery housing, and the battery housing is mounted on an electrical device through the supporting mechanism.

[0008] The load-bearing mechanism includes at least a load-bearing beam, a bolt, and a bushing. The load-bearing beam is connected to the electrical device via the bolt. The bushing is disposed between the load-bearing beam and the bolt. The diameter of the bolt shank is D, and the inner diameter of the bushing is d. The ratio of D / d is in the range of 0.5-0.95. The bolt shank is also coated with a corrosion-resistant layer. The length of the corrosion-resistant layer is set to be greater than the length of the contact area between the bolt and the bushing.

[0009] As can be seen from the above technical solutions, compared with the prior art, the battery pack disclosed in this utility model can effectively improve the reliability of the connection between the battery pack and the electrical device, and avoid phenomena such as loosening or displacement of the battery pack, thereby protecting the safety of vehicles and people. This is specifically reflected in the following three aspects:

[0010] 1) The bushing can prevent electrochemical corrosion between the bolts and the load-bearing beam due to different materials, thus avoiding the phenomenon of bolt strength reduction over a long period of time;

[0011] 2) When the D / d ratio is 1, there may be a very small gap or interference between the bolt shank and the bushing. During assembly, light tapping or the use of tools is required. The fit is highly accurate and has a certain degree of positioning and disassembly. When the D / d ratio is greater than 1, the bolt diameter is larger than the bushing inner diameter. During assembly, pressure or heating expansion is required. After the two fit together, there is no relative movement, the connection is rigid, and the anti-loosening effect is good. In this embodiment of the utility model, the D / d ratio is set to 0.5-0.95, that is, less than 1, which allows there to be a radial gap between the bolt shank and the bushing 300. No interference force is required during assembly. Therefore, the setting of this ratio range can realize the quick insertion and removal of the bolt 200, which is convenient for adjusting the installation position.

[0012] 3) When the bolt and bushing are assembled, the edge of the contact area may experience slight relative displacement due to vibration, which may cause wear on the surface protective layer. If the corrosion-resistant layer does not cover this area, the exposed metal is prone to corrosion due to reaction with water vapor and salt spray in the environment. This utility model covers all easily corroded areas such as the edge of the contact area and the exposed section by setting the length of the corrosion-resistant layer to be greater than the length of the contact part between the bolt and the bushing, thus preventing the spread of corrosion caused by coating breakage at the edge. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the bearing mechanism disclosed in the embodiments of this utility model;

[0015] Figure 2 for Figure 1 The main view;

[0016] Figure 3 for Figure 1 The left view;

[0017] Figure 4 for Figure 1 The right view;

[0018] Figure 5 for Figure 1 Top view;

[0019] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0020] Figure 7 This is a schematic diagram of the installation structure of the bolts and bushings disclosed in the embodiments of this utility model;

[0021] Figure 8 This is a schematic diagram of the bushing structure disclosed in the embodiment of this utility model;

[0022] Figure 9 for Figure 8 Top view;

[0023] Figure 10 for Figure 9 A cross-sectional view along the BB direction.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Load-bearing beam;

[0026] 200. Bolts;

[0027] 300. Bushing; 301. Bushing body; 302. First flange; 303. Second flange; 304. Transition section;

[0028] 400. Nuts. Detailed Implementation

[0029] In view of this, the core of this utility model is to provide a battery pack that can effectively improve the reliability of the connection between the battery pack and the electrical device, and avoid the battery pack from becoming loose or shifting, thereby protecting the lives and safety of vehicles and people.

[0030] Another core aspect of this utility model is that it provides an electrical device.

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Please refer to... Figures 1 to 10 .

[0032] Please refer to Figures 1 to 6 The battery pack disclosed in this embodiment of the utility model includes a battery box and a battery pack. The battery pack is disposed in the battery box, and a supporting mechanism is provided on the battery box. The battery box is installed on the electrical device through the supporting mechanism.

[0033] The load-bearing mechanism includes at least a load-bearing beam 100, a bolt 200, and a bushing 300. The load-bearing beam 100 is connected to the electrical device via the bolt 200. The bushing 300 is disposed between the load-bearing beam 100 and the bolt 200. The diameter of the shank of the bolt 200 is D, and the inner diameter of the bushing 300 is d. The ratio of D / d is in the range of 0.5-0.95. The shank of the bolt 200 is also coated with a corrosion-resistant layer. The length of the corrosion-resistant layer is set to be greater than the contact length between the bolt 200 and the bushing 300.

[0034] Compared with the prior art, the battery pack disclosed in this utility model embodiment can effectively improve the reliability of the connection between the battery pack and the electrical device, and avoid the battery pack from becoming loose or shifting, thereby protecting the lives of vehicles and people. Specifically, this is reflected in the following three aspects:

[0035] 1) The bushing 300 can prevent electrochemical corrosion between the bolt 200 and the load-bearing beam 100 due to different materials, and avoid the phenomenon of bolt 200 strength decreasing over time.

[0036] 2) When the D / d ratio is 1, there may be a very small gap or interference between the shank of the bolt 200 and the bushing 300. During assembly, light tapping or the use of tools is required. The fit is highly accurate and has a certain degree of positioning and disassembly. When the D / d ratio is greater than 1, the diameter of the bolt 200 is larger than the inner diameter of the bushing 300. During assembly, pressure or heating expansion is required. After the two fit together, there is no relative movement, the connection is rigid, and the anti-loosening effect is good. In this embodiment of the utility model, the D / d ratio is set to 0.5-0.95, that is, less than 1, which allows there to be a radial gap between the shank of the bolt 200 and the bushing 300. No interference force is required during assembly. Therefore, the setting of this ratio range can realize the quick insertion and removal of the bolt 200, which is convenient for adjusting the installation position.

[0037] 3) When the bolt 200 and bushing 300 are assembled, the edge of the contact area may experience slight relative displacement due to vibration, which may cause wear on the surface protective layer. If the corrosion-resistant layer does not cover this area, the exposed metal is prone to corrosion due to reaction with water vapor and salt spray in the environment. This utility model sets the length of the corrosion-resistant layer to be greater than the length of the contact part between the bolt 200 and bushing 300, so as to cover all easily corroded areas such as the edge of the contact area and the exposed section, and prevent the corrosion spread caused by the cracking of the coating at the edge.

[0038] As a specific embodiment, the D / d ratio range disclosed in this utility model embodiment is 0.1, 0.2, 0.5, 0.7 or 0.9.

[0039] As a further embodiment, the corrosion-resistant layer disclosed in this utility model is configured with both ends extending 8 mm to 30 mm beyond the ends of the bushing 300. This configuration avoids the risk of insufficient edge protection and localized corrosion due to excessive length, while also preventing material waste or interference with surrounding components due to excessive length, thus achieving a balance between economy and compatibility while ensuring comprehensive protection.

[0040] As a specific embodiment, the corrosion-resistant layer disclosed in this utility model is configured with both ends extending beyond the ends of the bushing 300 by 8 mm, 10 mm, 15 mm, 20 mm or 25 mm.

[0041] This utility model embodiment does not limit the specific materials of the bolt 200 and the load-bearing beam 100. Any structure that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0042] As a specific embodiment of this utility model, the material of the load-bearing beam 100 disclosed in this utility model embodiment is preferably aluminum alloy or magnesium alloy.

[0043] As a specific embodiment of this utility model, the bolt 200 disclosed in this utility model embodiment is preferably made of alloy steel.

[0044] This utility model embodiment does not limit the specific structure of the bushing 300. Any structure that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0045] As one embodiment, please refer to the following for details. Figure 7 The bushing 300 disclosed in this embodiment of the present utility model includes a bushing body 301, a first flange 302 and a second flange 303, with the first flange 302 and the second flange 303 respectively disposed at both ends of the bushing body 301.

[0046] The first flange 302 abuts against the nut of the bolt 200, and the second flange 303 abuts against the nut that mates with the bolt 200. This arrangement further enhances the connection strength between the bushing 300 and the bolt 200.

[0047] For further embodiments, please refer to the following: Figures 7-10 In this embodiment of the present invention, a transition portion 304 is provided between the first flange 302 and the bushing body 301. The outer diameter of the transition portion 304 is smaller than the outer diameter of the bushing body 301. This arrangement can effectively prevent interference between the support mechanism and the bottom hole of the lifting lug of the battery box.

[0048] As a further embodiment, the transition portion 304 disclosed in this utility model embodiment has an arc-shaped structure, wherein the transition portion 304 protrudes towards the central axis of the bushing body 301. This arrangement can provide a good guiding effect for the bolt 200.

[0049] As a further embodiment, the radius of curvature of the transition portion 304 disclosed in this utility model embodiment is 0.1mm-3mm. This configuration effectively avoids interference with the R-angle of the bolt 200, thereby further achieving a guiding effect on bolt installation.

[0050] It should be explained that the R-angle of bolt 200 refers to the radius of the fillet at the connection between the head of bolt 200 and the threaded rod (or the part where the threaded rod and nut mate), also known as the "transition fillet".

[0051] As a specific embodiment, the radius of curvature of the transition portion 304 disclosed in this utility model embodiment is 0.1mm, 0.9mm, 1.5mm, 2mm, 2.5mm or 3mm.

[0052] As a further embodiment, the ratio of the length of the transition portion 304 to the length of the bushing body 301 disclosed in this embodiment of the present invention is 0.005-0.35. This arrangement can effectively ensure the effective contact surface between the bolt 200 and the bushing 300.

[0053] As a specific embodiment, the ratio of the length of the transition portion 304 to the length of the bushing body 301 disclosed in this utility model embodiment is 0.005, 0.01, 0.1, 0.2, 0.3 or 0.35.

[0054] This utility model embodiment also discloses an electrical device, including a battery pack as disclosed in any of the above embodiments.

[0055] Since the power device uses the battery pack disclosed in the present utility model embodiment, the power device also has the technical advantages of the battery pack disclosed in the present utility model embodiment, and the present utility model embodiment will not elaborate on these advantages further.

[0056] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, It includes a battery housing and a battery pack, the battery pack being disposed within the battery housing, and a supporting mechanism being provided on the battery housing, the battery housing being mounted on an electrical device via the supporting mechanism; The load-bearing mechanism includes at least a load-bearing beam, a bolt, and a bushing. The load-bearing beam is connected to the electrical device via the bolt. The bushing is disposed between the load-bearing beam and the bolt. The diameter of the bolt shank is D, and the inner diameter of the bushing is d. The ratio of D / d is in the range of 0.5-0.

95. The bolt shank is also coated with a corrosion-resistant layer. The length of the corrosion-resistant layer is set to be greater than the length of the contact area between the bolt and the bushing.

2. The battery pack according to claim 1, characterized in that, Both ends of the corrosion-resistant layer are configured to extend 8 mm to 30 mm beyond the ends of the bushing.

3. The battery pack according to claim 1, characterized in that, The load-bearing beam is made of aluminum alloy or magnesium alloy.

4. The battery pack according to claim 1, characterized in that, The bolt is made of alloy steel.

5. The battery pack according to claim 1, characterized in that, The bushing includes a bushing body, a first flange, and a second flange, wherein the first flange and the second flange are respectively disposed at both ends of the bushing body; The first flange abuts against the nut of the bolt, and the second flange abuts against the nut that mates with the bolt.

6. The battery pack according to claim 5, characterized in that, A transition portion is also provided between the first flange and the bushing body, and the outer diameter of the transition portion is smaller than the outer diameter of the bushing body.

7. The battery pack according to claim 6, characterized in that, The transition section has an arc-shaped structure and protrudes towards the central axis of the bushing body.

8. The battery pack according to claim 6, characterized in that, The radius of curvature of the transition section is 0.1 mm - 3 mm.

9. The battery pack according to claim 6, characterized in that, The ratio of the length of the transition section to the length of the bushing body is 0.005-0.

35.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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