Battery pack upper cover, battery pack and electric device

Abstract

The utility model discloses a battery pack upper cover which comprises an upper cover plate, a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, and the outer surface of the upper cover plate comprises a first plate surface and a second plate surface which are opposite in orientation; wherein the first reinforcing rib is arranged on the first plate surface and protrudes from the first plate surface to one side deviating from the second plate surface; the second reinforcing rib is arranged on the second plate surface and protrudes from one side, deviating from the first plate surface, of the second plate surface; a first direction is defined by a projection plane parallel to the first plate face, the first reinforcing ribs and the second reinforcing ribs are alternately distributed in the first direction, and the adjacent first reinforcing ribs and second reinforcing ribs are arranged at intervals in the first direction. The utility model also provides a battery pack and an electric device with the same. The surface rigidity and structural strength of the upper cover plate can be improved, the deformation resistance of the upper cover plate is enhanced, the first-order local mode of the upper cover plate is improved under the condition of the same material thickness, the situation that the upper cover plate is excited in the low-order mode to generate resonance abnormal sound is avoided, and the purpose of improving the NVH performance of the whole package is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of battery structures, and in particular to a battery pack cover, a battery pack and an electrical device. Background Art

[0002] As a core component of new energy vehicles, the safety of power batteries is directly linked to the safety of the entire vehicle. In new energy vehicles, multiple battery cells are typically assembled into a battery pack, which consists of a housing and a cover assembly. The cover assembly seals the interior of the housing and protects the battery pack.

[0003] With the increasing demand for lightweight vehicles, batteries, as components that account for a relatively high proportion of the weight of the entire vehicle, also need to be designed to be lightweight. In this regard, the existing technology proposes to reduce the weight of the battery pack structure to make the battery pack structure lighter. Since the thickness of the battery pack box must also consider the sealing requirements on the basis of meeting the strength, the existing technology proposes to reduce the weight of the battery pack by reducing the material thickness of the cover assembly. However, this is bound to affect the structural strength of the cover assembly, especially the upper cover of the existing battery pack usually does not have a complex reinforcing rib morphology, and is generally composed of a large plane or simple horizontal and vertical ribs. After thinning, it is not only easily excited in the first-order local mode and resonates, resulting in abnormal noise and affecting the NVH performance of the entire vehicle, but is also prone to deformation, posing a major safety hazard. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a battery pack cover, a battery pack and an electrical device, which can improve the surface stiffness and local mode of the battery pack cover by optimizing the morphology, structure and distribution of the reinforcing ribs.

[0005] According to one aspect of an embodiment of the present application, a battery pack upper cover is provided, comprising: an upper cover plate, the outer surface of the upper cover plate comprising a first plate surface and a second plate surface facing oppositely; a plurality of first reinforcing ribs, the first reinforcing ribs being arranged on the first plate surface and protruding from the first plate surface to the side away from the second plate surface; and a plurality of second reinforcing ribs, the second reinforcing ribs being arranged on the second plate surface and protruding from the second plate surface to the side away from the first plate surface; wherein a projection plane parallel to the first plate surface defines a first direction, the plurality of first reinforcing ribs and the plurality of second reinforcing ribs are alternately distributed along the first direction, and adjacent first reinforcing ribs and second reinforcing ribs are spaced apart along the first direction.

[0006] In an exemplary embodiment of the present application, a projection plane parallel to the first plate surface defines a second direction, which is perpendicular to the first direction; a plurality of first reinforcing ribs and a plurality of second reinforcing ribs are alternately distributed along the second direction, and adjacent first reinforcing ribs and second reinforcing ribs are spaced apart along the second direction.

[0007] In an exemplary embodiment of the present application, the first reinforcing rib is M-shaped or W-shaped on the projection surface of the first plate surface, and the second reinforcing rib and the first reinforcing rib are centrally symmetrically arranged about the midpoint of the distance between their centroids.

[0008] In an exemplary embodiment of the present application, the first reinforcing rib in an M-shape or W-shape has two free ends, two crest ends and one trough end, the two free ends are distributed along the first direction, and the projection line of the two free ends on the first plate surface and the projection line of the two crest ends on the first plate surface are parallel to each other; wherein, the spacing between the two free ends is the first spacing, the spacing between the two crest ends is the second spacing, and the ratio of the second spacing to the first spacing is in the range of 1:2 to 1:1.

[0009] In an exemplary embodiment of the present application, the projection distance between the crest end and the trough end in the second direction is a third spacing, the projection distance between the crest end and the free end in the second direction is a fourth spacing, the ratio of the third spacing to the fourth spacing ranges from 1:3 to 1:2, and the ratio of the fourth spacing to the first spacing ranges from 1:2 to 3:2.

[0010] In an exemplary embodiment of the present application, the centroid distance between adjacent first reinforcing ribs and second reinforcing ribs spaced apart along the first direction is a fifth distance, and the ratio of the fifth distance to the first distance is in a range of 3:2 to 5:2.

[0011] In an exemplary embodiment of the present application, the centroid distance between adjacent first reinforcing ribs and second reinforcing ribs spaced apart along the second direction is a sixth distance, and the ratio of the sixth distance to the fourth distance is in a range of 3:2 to 5:2.

[0012] In an exemplary embodiment of the present application, the first reinforcing rib is stamped from the second plate surface toward the first plate surface, and the second reinforcing rib is stamped from the first plate surface toward the second plate surface.

[0013] According to a second aspect of an embodiment of the present application, a battery pack is provided, comprising any of the above-mentioned battery pack covers.

[0014] According to a third aspect of an embodiment of the present application, there is provided an electrical device comprising the above-mentioned battery pack.

[0015] The present application provides first and second reinforcing ribs with opposite protruding directions on the outer surface of the upper cover plate, and alternately arranges the first and second reinforcing ribs along the first direction. On the one hand, it can improve the surface stiffness and structural strength of the upper cover plate and enhance the deformation resistance of the upper cover plate. On the other hand, under the condition of the same material thickness, it can improve the first-order local mode of the upper cover plate and avoid the upper cover plate being excited in the low-order mode and generating resonant abnormal noise, thereby achieving the purpose of improving the NVH performance of the entire package.

[0016] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of the battery pack cover according to an embodiment of the present application is shown;

[0019] Figure 2 Shown Figure 1 Cross-sectional view at AA in the middle.

[0020] Figure 3 A projection view of the battery pack described in an embodiment of the present application is shown on the first plate surface.

[0021] Description of Figure Numbers:

[0022] 1-upper cover, 11-upper cover body, 111-first plate surface, 112-second plate surface, 113-second mounting hole, 12-flange edge, 121-first mounting hole, 2-first reinforcing rib, 21-first rib portion, 22-second rib portion, 23-free end, 24-peak end, 25-trough end, 3-second reinforcing rib,

[0023] X1-first spacing, X2-second spacing, Y1-third spacing, Y2-fourth spacing, L1-fifth spacing, L2-sixth spacing.

[0024] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0026] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0027] The present application is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0028] like Figure 1 and Figure 2 As shown, this embodiment provides a battery pack cover, including an upper cover plate 1, a plurality of first reinforcing ribs 2 and a plurality of second reinforcing ribs 3, wherein the outer surface of the upper cover plate 1 includes a first plate surface 111 and a second plate surface 112 facing oppositely; the first reinforcing rib 2 is provided on the first plate surface 111, and protrudes from the first plate surface 111 to the side away from the second plate surface 112; the second reinforcing rib 3 is provided on the second plate surface 112, and protrudes from the second plate surface 112 to the side away from the first plate surface 111; the projection plane parallel to the first plate surface 111 defines a first direction S1, and the first direction S1 can be understood as the length direction of the upper cover plate 1, and the plurality of first reinforcing ribs 2 and the plurality of second reinforcing ribs 3 are alternately distributed along the first direction S1, and adjacent first reinforcing ribs 2 and second reinforcing ribs 3 are spaced apart along the first direction S1. Through the arrangement of the above-mentioned first reinforcing ribs 2 and second reinforcing ribs 3, on the one hand, the vertical and lateral torsional and bending resistance can be improved, thereby achieving the purpose of improving the surface stiffness and structural strength of the upper cover plate 1 and enhancing the deformation resistance of the upper cover plate 1. On the other hand, under the condition of the same material thickness, the first-order local mode of the upper cover plate 1 can be improved, thereby avoiding the upper cover plate 1 being excited in the low-order mode and generating resonance and abnormal noise, thereby improving the NVH performance of the entire battery pack.

[0029] Preferably, the first reinforcing rib 2 can be configured to protrude from the first plate surface 111 toward the side away from the second plate surface 112 by stamping the first reinforcing rib 2 from the second plate surface 112 toward the first plate surface 111, so that the first reinforcing rib 2 and the upper cover plate 1 are formed into one piece. This not only simplifies the production process and improves production efficiency, but also saves material costs and improves material utilization. Similarly, the second reinforcing rib 3 can be stamped from the first plate surface 111 toward the second plate surface 112 by stamping, so that the second reinforcing rib 3 protrudes from the second plate surface 112 toward the side away from the first plate surface 111 and is formed into one piece with the upper cover plate 1, thereby achieving the same technical effect as described above.

[0030] Furthermore, if Figure 1 and Figure 2 As shown, a projection plane parallel to the first plate surface 111 defines a second direction S2, which is perpendicular to the first direction S1 and can be understood as the width direction of the upper cover plate 1. A plurality of first reinforcing ribs 2 and a plurality of second reinforcing ribs 3 are alternately distributed along the second direction S2, and adjacent first reinforcing ribs 2 and second reinforcing ribs 3 are spaced apart along the second direction S2. In this way, the first and second reinforcing ribs 2 and 3 can be evenly distributed along the length and width of the upper cover plate 1, improving the utilization rate of the surface excess material of the upper cover plate 1 and the rib distribution rate, further enhancing its vertical and longitudinal torsional and bending resistance, and enhancing the structural stability of the upper cover plate 1.

[0031] In some embodiments, as Figure 1 and Figure 2 As shown, the first reinforcing rib 2 is M-shaped or W-shaped when projected onto the first plate surface 111. The second reinforcing rib 3 and the first reinforcing rib 2 are arranged symmetrically about the midpoint of the distance between their centroids. The midpoint of the distance between their centroids is the midpoint of the line connecting the geometric center of the second reinforcing rib 3 and the geometric center of the first reinforcing rib 2. The second reinforcing rib 3 and the first reinforcing rib 2 are symmetrical about this midpoint. In this way, the second reinforcing rib 3 and the first reinforcing rib 2 have the same structure but are arranged in opposite directions. The adjacent first and second reinforcing ribs 2 and 3 cooperate to achieve uniform force transmission. Simulation calculations show that when the first and second reinforcing ribs 2 and 3, formed into an M or W shape, are arranged on the upper cover plate 1 in the above-mentioned arrangement, the first-order local mode of the upper cover plate 1 is 29.8Hz, meeting the target value of >25Hz. This improves the local mode, effectively reduces the transmission of resonant noise, improves NVH performance, and significantly enhances driving comfort.

[0032] For example, if Figure 1 and Figure 2As shown, in this embodiment, the first reinforcing rib 2 includes two obliquely arranged first ribs 21 and two obliquely arranged second ribs 22. The two first ribs 21 are symmetrically spaced along the first direction S1, and the two second ribs 22 are symmetrically arranged between the two first ribs 21 along the first direction S1. The first end of one second rib 22 is connected to the first end of the other second rib 22, and the second ends of the two second ribs 22 are respectively connected to the ends of the two first ribs 21 with the shorter spacing, thus forming a W-shaped reinforcing rib. The second reinforcing rib 3 has the same structural composition as the first reinforcing rib 2 and will not be described in detail here. However, the free end of the second reinforcing rib 3 is arranged in the opposite direction to the free end of the first reinforcing rib 2, thus forming an M-shaped reinforcing rib. In this way, adjacent first reinforcing ribs 2 and second reinforcing ribs 3 (including those adjacent in the first direction S1 and the second direction S2) can cooperate with each other to achieve effective force transmission, thereby achieving the aforementioned purpose of improving the structural strength and local modality of the upper cover plate 1.

[0033] In some embodiments, as Figure 1 and Figure 3 As shown, the M-shaped or W-shaped reinforcing rib (including the first reinforcing rib 2 and the second reinforcing rib 3) has two free ends 23, two crest ends 24 and a trough end 25. Taking the W-shaped first reinforcing rib 2 as an example, the end where the two second ribs 22 are connected constitutes the trough end 25, the end where the second rib 22 is connected to the first rib 21 respectively constitutes two crest ends 24, and the ends where the distance between the two first ribs 21 is longer respectively constitute two free ends 23; the two free ends 23 are distributed along the first direction S1, and the two free ends 23 are at The projection line of the first plate surface 111 and the projection line of the two wave peak ends 24 on the first plate surface 111 are parallel to each other; wherein, the distance between the two free ends 23 is the first distance X1, and the distance between the two wave peak ends 24 is the second distance X2, and the ratio range of the second distance X2 to the first distance X1 is limited to 1:2 to 1:1. Within this ratio range, the M-shaped or W-shaped reinforcement ribs can have good anti-deformation ability in their own length direction, so as to effectively improve the support strength and overall rigidity of the upper cover plate 1 in the first direction S1.

[0034] In some embodiments, as Figure 3 As shown, the projection distance between the crest end 24 and the trough end 25 in the second direction S2 is a third spacing Y1, and the projection distance between the crest end 24 and the free end 23 in the second direction S2 is a fourth spacing Y2. The ratio range of the third spacing Y1 to the fourth spacing Y2 is 1:3 to 1:2, and the ratio range of the fourth spacing Y2 to the first spacing X1 is 1:2 to 3:2. Within this ratio range, the M-shaped or W-shaped reinforcement rib can have good anti-deformation ability in its own width direction, so as to effectively improve the support strength and overall rigidity of the upper cover plate 1 in the second direction S2.

[0035] In some embodiments, as Figure 3 As shown, on the projection surface of the first plate surface 111, the centroid distance between the adjacent first reinforcing ribs 2 and the second reinforcing ribs 3 spaced apart along the first direction S1 is the fifth spacing L1, and the ratio range of the fifth spacing L1 to the first spacing X1 is 3:2 to 5:2. Within this ratio range, the action ranges of the first reinforcing ribs 2 and the second reinforcing ribs 3 adjacent to each other in the first direction S1 can overlap with each other, and then cooperate with each other to achieve effective transmission of the action force, so as to achieve the aforementioned purpose of improving the structural strength and local mode of the upper cover plate 1 in the first direction S1.

[0036] In some embodiments, as Figure 3 As shown, on the projection surface of the first plate surface 111, the centroid distance between the adjacent first reinforcing ribs 2 and the second reinforcing ribs 3 spaced apart along the second direction S2 is the sixth distance L2, and the ratio range of the sixth distance L2 to the fourth distance Y2 is 3:2 to 5:2. Within this ratio range, the action ranges of the first reinforcing ribs 2 and the second reinforcing ribs 3 adjacent to each other in the second direction S2 can overlap with each other, and then cooperate with each other to achieve effective transmission of the action force, so as to achieve the aforementioned purpose of improving the structural strength and local mode of the upper cover plate 1 in the second direction S2.

[0037] In addition, in another embodiment, a battery pack is provided, which includes a battery box (not shown) and the above-mentioned battery pack cover. Figure 1 As shown, the upper cover 1 of the battery pack upper cover includes an upper cover body 11 and a flange edge 12 extending outward along the circumference of the upper cover body 11; the first plate surface 111 and the second plate surface 112 are limited to the upper cover body 11, and the first reinforcing rib 2 and the second reinforcing rib 3 are both provided on the upper cover body 11; a plurality of first mounting holes 121 are provided on the flange edge 12, and the battery case has a storage cavity for accommodating battery cells and an opening connected to the storage cavity, and a first connecting hole is provided on the upper end surface of the opening of the battery case corresponding to the first mounting hole 121. The upper cover 1 is covered on the opening of the battery case, and the first mounting hole 121 and the first connecting hole are connected by bolts, so as to realize the fixed connection between the upper cover 1 and the battery case, and the storage cavity of the battery case is closed to protect the battery pack therein.

[0038] In some embodiments, a plurality of partition plates (not shown) may be provided in the storage cavity of the battery box. The partition plates may provide support before storage and may also divide the storage cavity into multiple small cavities to improve heat insulation and thermal runaway resistance. Therefore, if Figure 1As shown, a projection plane perpendicular to the first plate surface 111 defines a third direction S3, and the upper cover body 11 is further provided with a plurality of second mounting holes 113 arranged along the third direction S3 and passing through the first plate surface 111 and the second plate surface 112. A second connecting hole is provided on the upper end surface of the partition plate corresponding to the second mounting hole 113. The second mounting hole 113 and the second connecting hole are connected by bolts, so that the upper cover plate 1 can be fixedly connected to the partition plate, and the structural stability of the battery pack can be further improved. At the same time, the upper cover plate 1 is supported and fixed on the plate surface part, which further improves the supporting strength and anti-deformation ability of the upper cover plate 1.

[0039] It can be understood that in this battery pack, for other structures and working principles of the battery pack cover, please refer to the above-mentioned description of the embodiment of the battery pack cover. Since the battery pack cover has the above-mentioned technical effects, the battery pack with the battery pack cover should also have corresponding technical effects, which will not be repeated here.

[0040] In another embodiment, an electrical device is provided, comprising the battery pack or battery pack cover of the aforementioned embodiment. Such an electrical device includes, but is not limited to, power supply equipment, vehicles, ships, and spacecraft. For other structures and operating principles of the battery pack or battery pack cover in such an electrical device, please refer to the aforementioned description of the embodiments of the battery pack or battery pack cover. Since the battery pack or battery pack cover has the aforementioned technical effects, an electrical device incorporating such a battery pack or battery pack cover should also have corresponding technical effects, and will not be further elaborated here.

[0041] It is understood that, in this application, unless otherwise expressly specified or limited, terms such as "assembly" and "connection" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined. And the descriptions of terms such as "some embodiments" and "exemplarily" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application.

[0043] The illustrative descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0044] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent covered by this application.

Claims

1. A battery pack cover, characterized in that: include: An upper cover plate, wherein an outer surface of the upper cover plate includes a first plate surface and a second plate surface facing oppositely; a plurality of first reinforcing ribs, wherein the first reinforcing ribs are provided on the first plate surface and protrude from the first plate surface toward a side away from the second plate surface; and a plurality of second reinforcing ribs, the second reinforcing ribs being provided on the second plate surface and protruding from the second plate surface toward a side away from the first plate surface; The projection plane parallel to the first plate surface defines a first direction, a plurality of the first reinforcing ribs and a plurality of the second reinforcing ribs are alternately distributed along the first direction, and adjacent first reinforcing ribs and second reinforcing ribs are spaced apart along the first direction.

2. The battery pack cover according to claim 1, characterized in that: A projection plane parallel to the first plate surface defines a second direction, which is perpendicular to the first direction; a plurality of first reinforcing ribs and a plurality of second reinforcing ribs are alternately distributed along the second direction, and adjacent first reinforcing ribs and second reinforcing ribs are spaced apart along the second direction.

3. The battery pack cover according to claim 2, characterized in that: The projection surface of the first reinforcing rib on the first plate surface is M-shaped or W-shaped, and the second reinforcing rib and the first reinforcing rib are centrally symmetrically arranged about the midpoint of the distance between the centroids thereof.

4. The battery pack cover according to claim 3, characterized in that: The first M-shaped or W-shaped reinforcing rib has two free ends, two crest ends, and one trough end, the two free ends are distributed along the first direction, and a line connecting the projections of the two free ends on the first plate surface is parallel to a line connecting the projections of the two crest ends on the first plate surface; The distance between the two free ends is a first distance, the distance between the two peak ends is a second distance, and the ratio of the second distance to the first distance is in the range of 1:2 to 1:

1.

5. The battery pack cover according to claim 4, characterized in that: The projection distance between the crest end and the trough end in the second direction is a third spacing, the projection distance between the crest end and the free end in the second direction is a fourth spacing, the ratio of the third spacing to the fourth spacing ranges from 1:3 to 1:2, and the ratio of the fourth spacing to the first spacing ranges from 1:2 to 3:

2.

6. The battery pack cover according to claim 5, characterized in that: The centroid distance between the adjacent first reinforcing ribs and second reinforcing ribs spaced apart along the first direction is a fifth distance, and the ratio of the fifth distance to the first distance is in a range of 3:2 to 5:

2.

7. The battery pack cover according to claim 6, characterized in that: The centroid distance between adjacent first reinforcing ribs and second reinforcing ribs spaced apart along the second direction is a sixth distance, and the ratio of the sixth distance to the fourth distance is in a range of 3:2 to 5:

2.

8. The battery pack cover according to claim 1, characterized in that: The first reinforcing rib is formed by stamping from the second plate surface to the first plate surface, and the second reinforcing rib is formed by stamping from the first plate surface to the second plate surface.

9. A battery pack, characterized in that: Comprising a battery pack cover as described in any one of claims 1-8.

10. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 9.

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