Bottom protection plate of battery pack, battery box and battery pack

Abstract

The utility model provides a bottom protection plate of a battery pack, a battery box and the battery pack. The bottom protection plate of the battery pack comprises an upper-layer plate, a middle-layer plate, a lower-layer plate, a reinforcing part located between the upper-layer plate and the middle-layer plate and an energy absorption part located between the middle-layer plate and the lower-layer plate, the reinforcing part is constructed to be capable of resisting deformation, and the energy absorption part is constructed to be capable of absorbing energy and buffering. According to the technical scheme provided by the utility model, the risk that a battery core of the battery pack is easily invaded due to the fact that the bottom protection plate is easily deformed in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a bottom protection plate, a battery box and a battery pack of a battery pack. Background Art

[0002] With the rapid development of battery pack technology and the lightweight of electric vehicles, the battery pack increasingly undertakes the mechanical properties such as the rigidity and strength of the whole vehicle. Since the battery pack is placed at the bottom of the electric vehicle, the bottom protection of the battery pack is highly emphasized by major vehicle manufacturers.

[0003] In the prior art, most of the bottom protection plates of the battery pack are single-layer plates, and the single-layer bottom protection plate has poor rigidity and is difficult to play the role of protecting the bottom of the battery pack; there are also some double-layer bottom protection plates, but the double-layer bottom protection plates are also prone to deformation, which easily leads to the risk of intrusion of the battery pack core. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a bottom protection plate, a battery box and a battery pack of a battery pack, so as to solve the problem that the bottom protection plate in the prior art is prone to deformation and easily leads to the risk of intrusion of the battery pack core.

[0005] To achieve the above purpose, the utility model provides a bottom protection plate of a battery pack, including: an upper layer plate, a middle layer plate, a lower layer plate, a strengthening part located between the upper layer plate and the middle layer plate, and an energy absorption part located between the middle layer plate and the lower layer plate. The strengthening part is configured to be able to resist deformation, and the energy absorption part is configured to be able to absorb energy and buffer.

[0006] Through the above setting, by setting three layers of plates, and providing a strengthening part between the upper layer plate and the middle layer plate, and an energy absorption part between the middle layer plate and the lower layer plate, the dual functions of upper part resistance to deformation and lower part energy absorption can be realized, thereby avoiding the deformation of the bottom protection plate on the side of the battery core under working conditions such as bottom ball impact, and also avoiding the problem of deformation caused by the impact of the bottom protection plate, and further avoiding the risk of intrusion of the battery core due to the deformation of the bottom protection plate.

[0007] Furthermore, the strengthening part includes a plurality of strengthening members, the plurality of strengthening members are arranged along the first direction, each strengthening member is used to connect the upper layer plate and the middle layer plate, each strengthening member is obliquely arranged between the upper layer plate and the middle layer plate, and the inclination directions of two adjacent strengthening members among the plurality of strengthening members are opposite.

[0008] Through the above setting, a triangular strengthening structure can be formed between the upper layer plate and the middle layer plate. The triangular structure has strong stability, greatly increases the ability of the bottom protection plate to resist deformation, and thus is used to ensure the overall rigidity of the upper half of the bottom protection plate and the ability to resist deformation.

[0009] Furthermore, two adjacent reinforcing members among the multiple reinforcing members and the middle layer plate enclose a positive triangular cavity, and two adjacent reinforcing members among the multiple reinforcing members and the upper layer plate enclose a reverse triangular cavity. The positive triangular cavities and the reverse triangular cavities are alternately arranged in the first direction.

[0010] With the above arrangement, triangular cavities are formed between the upper layer plate and the middle layer plate, which not only has strong stability, greatly increases the ability of the bottom guard plate to resist deformation, but also the triangular cavities can achieve effective energy absorption, thus effectively avoiding deformation on the battery cell side of the bottom guard plate under working conditions such as bottom ball impact.

[0011] Furthermore, a plurality of rectangular cavities are formed in the energy absorption part, and the plurality of rectangular cavities are arranged at intervals in the first direction.

[0012] With the above arrangement, the middle layer plate and the lower layer plate are rectangular cavities, and the rectangular cavities have strong deformation ability, greatly increasing the energy absorption effect of the bottom guard plate, so as to ensure that there is enough energy absorption space and deformation ability in the lower half of the bottom guard plate.

[0013] Furthermore, a reinforcing component is formed between two adjacent rectangular cavities, and both ends of the reinforcing component are respectively connected to the middle layer plate and the lower layer plate.

[0014] With the above arrangement, the ability of the lower half of the bottom guard plate to resist deformation can be increased to avoid excessive deformation of the bottom guard plate.

[0015] Furthermore, when the reinforcing part is formed with a plurality of positive triangular cavities and a plurality of reverse triangular cavities, and the positive triangular cavities and the reverse triangular cavities are alternately arranged in the first direction, the plurality of positive triangular cavities are correspondingly arranged with the plurality of rectangular cavities.

[0016] With the above arrangement, the positions where two adjacent reinforcing members are connected can be correspondingly arranged with the reinforcing component, so as to meet the working conditions of two kinds of bottom ball impacts.

[0017] Furthermore, the upper layer plate includes a main body part and a mounting part connected to the periphery of the main body part. A plurality of mounting holes are provided on the mounting part, and a reinforcing part is provided between the main body part and the middle layer plate.

[0018] With the above arrangement, the mounting part can fixedly connect the bottom guard plate to the four side plates of the battery box.

[0019] Furthermore, the upper layer plate, the middle layer plate, the lower layer plate, the reinforcing part and the energy absorption part are integrally formed.

[0020] The above structure is compact, without complex processing procedures, and can be mass-produced.

[0021] According to another aspect of the present utility model, the present utility model provides a battery box, which includes the above-mentioned bottom guard plate, a plurality of side plates and a top plate, and the plurality of side plates are connected between the top plate and the bottom guard plate.

[0022] According to another aspect of the present utility model, the present utility model provides a battery pack, which includes the above-mentioned battery box and a battery cell assembly located inside the battery box.

[0023] By applying the technical solution of the present utility model, by providing three layers of plates, and a strengthening part is provided between the upper layer plate and the middle layer plate, and an energy absorption part is provided between the middle layer plate and the lower layer plate, the dual functions of upper part resistance to deformation and lower part energy absorption can be achieved, thereby avoiding the deformation of the bottom guard plate on the battery cell side under working conditions such as bottom ball impact, and also avoiding the problem of deformation caused by the impact of the bottom guard plate, and further avoiding the risk of the bottom guard plate deforming and invading the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0025] Figure 1 shows a structural schematic diagram of one direction of the bottom guard plate of the battery pack of the present utility model;

[0026] Figure 2 shows Figure 1 a top view of the bottom guard plate of the battery pack;

[0027] Figure 3 shows Figure 1 a structural schematic diagram of the upper layer plate of the bottom guard plate of the battery pack;

[0028] Figure 4 shows Figure 1 a left view of the bottom guard plate of the battery pack;

[0029] Figure 5 shows Figure 4 a partial enlarged view of part Ⅰ of the bottom guard plate of the battery pack;

[0030] Figure 6 shows Figure 4 a partial enlarged view of part Ⅱ of the bottom guard plate of the battery pack.

[0031] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0032] 1, mounting hole; 2, upper layer plate; 3, middle layer plate; 4, lower layer plate; 5, strengthening part; 51, strengthening member; 52, forward triangular cavity; 53, reverse triangular cavity; 6, energy absorption part; 61, rectangular cavity; 62, strengthening component. Detailed implementation manners

[0033] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the accompanying drawings and combine with the embodiments to detail the present utility model.

[0034] As Figures 1 to 6 shown, the embodiment of the present utility model provides a bottom guard plate of a battery pack. The bottom guard plate of the battery pack includes: an upper layer plate 2, a middle layer plate 3, a lower layer plate 4, a strengthening part 5 located between the upper layer plate 2 and the middle layer plate 3, and an energy absorption part 6 located between the middle layer plate 3 and the lower layer plate 4. The strengthening part 5 is configured to be able to resist deformation, and the energy absorption part 6 is configured to be able to absorb energy and buffer.

[0035] In the above technical solution, by providing three-layer plates, and arranging a strengthening part 5 between the upper layer plate 2 and the middle layer plate 3, and arranging an energy absorption part 6 between the middle layer plate 3 and the lower layer plate 4, the dual functions of upper part resisting deformation and lower part absorbing energy can be realized, thereby avoiding the deformation of the bottom guard plate on the side of the battery cell under working conditions such as bottom ball impact, and also avoiding the problem of deformation caused by the impact of the bottom guard plate, and further avoiding the risk of the bottom guard plate deforming and invading the battery cell.

[0036] As Figures 4 to 6 shown, in the embodiment of the present utility model, the strengthening part 5 includes a plurality of strengthening members 51. The plurality of strengthening members 51 are arranged along a first direction. Each strengthening member 51 is used to connect the upper layer plate 2 and the middle layer plate 3. Each strengthening member 51 is obliquely arranged between the upper layer plate 2 and the middle layer plate 3. The inclination directions of two adjacent strengthening members 51 among the plurality of strengthening members 51 are opposite.

[0037] Through the above setting, a triangular strengthening structure can be formed between the upper layer plate and the middle layer plate. The triangular structure has very strong stability, greatly increasing the ability of the bottom guard plate to resist deformation, so as to ensure the overall stiffness of the upper half of the bottom guard plate and the ability to resist deformation.

[0038] As Figures 4 to 6 shown, in the embodiment of the present utility model, a positive triangular cavity 52 is formed between two adjacent strengthening members 51 among the plurality of strengthening members 51 and the middle layer plate 3, and a reverse triangular cavity 53 is formed between two adjacent strengthening members 51 among the plurality of strengthening members 51 and the upper layer plate 2. The positive triangular cavity 52 and the reverse triangular cavity 53 are alternately arranged in the first direction.

[0039] Through the above setting, a triangular cavity is formed between the upper layer plate 2 and the middle layer plate 3, which not only has very strong stability, greatly increasing the ability of the bottom guard plate to resist deformation, but also the triangular cavity can realize effective energy absorption, thereby effectively avoiding the deformation of the bottom guard plate on the side of the battery cell under working conditions such as bottom ball impact.

[0040] It should be noted that in the embodiments of the present utility model, the first direction is the width direction of the bottom guard plate, that is, Figure 4 the left - right direction in

[0041] Preferably, in the embodiments of the present utility model, the strengthening member 51 is an inclined rib.

[0042] Preferably, in the embodiments of the present utility model, the forward triangular cavity 52 and the reverse triangular cavity 53 are through - holes extending along the length direction of the bottom guard plate, that is, the length direction of the bottom guard plate is Figure 4 the direction perpendicular to the paper surface in

[0043] As Figure 4 shown, in the embodiments of the present utility model, a plurality of rectangular cavities 61 are formed in the energy - absorbing portion 6, and the plurality of rectangular cavities 61 are arranged at intervals along the first direction.

[0044] Through the above - mentioned arrangement, between the middle layer plate 3 and the lower layer plate 4 is the rectangular cavity 61. The rectangular cavity 61 has a strong deformation ability, greatly increasing the energy - absorbing effect of the bottom guard plate, so as to ensure that there is sufficient energy - absorbing space and deformation ability in the lower half of the bottom guard plate.

[0045] Preferably, in the embodiments of the present utility model, the rectangular cavity 61 is a through - hole extending along the length direction of the bottom guard plate, that is, the length direction of the bottom guard plate is Figure 4 the direction perpendicular to the paper surface in

[0046] As Figures 4 to 6 shown, in the embodiments of the present utility model, a strengthening component 62 is formed between two adjacent rectangular cavities 61, and both ends of the strengthening component 62 are respectively connected to the middle layer plate 3 and the lower layer plate 4. In this way, the deformation resistance ability of the lower half of the bottom guard plate can be increased to avoid excessive deformation of the bottom guard plate.

[0047] Preferably, in the embodiments of the present utility model, the strengthening component 62 is a vertical rib.

[0048] As Figures 4 to 6 shown, in the embodiments of the present utility model, when the strengthening portion 5 is formed with a plurality of forward triangular cavities 52 and a plurality of reverse triangular cavities 53, and the forward triangular cavities 52 and the reverse triangular cavities 53 are alternately arranged in the first direction, the plurality of forward triangular cavities 52 are correspondingly arranged with the plurality of rectangular cavities 61. In this way, the positions where two adjacent strengthening members 51 are connected can be correspondingly arranged with the strengthening component 62, so as to meet the working conditions of two types of bottom ball impacts.

[0049] Specifically, due to the array nature of the structure of the utility model, the ball - impact points in working conditions such as bottom ball impact are mainly divided into two types. One is, for example, Figure 5 the middle part of the rectangular cavity 61 (the ball - impact position at point A) as shown, and the other is, for example, Figure 6The reinforcing member 62 (the B point impact position) adjacent to the two rectangular cavities 61 shown. The specific bottom protection principle of this embodiment:

[0050] (Ⅰ) As shown in Figure 5 , when a bottom ball impact is carried out at point A, the rectangular cavity 61 between the middle layer plate 3 and the lower layer plate 4 can perform the first energy absorption; when the energy absorption area of the rectangular cavity 61 is crushed, the positive triangular cavity 52 between the upper layer plate 2 and the middle layer plate 3 can perform the second energy absorption; at the same time, since the structure between the upper layer plate 2 and the middle layer plate 3 is a triangular reinforcing structure (the inclination directions of two adjacent reinforcing members 51 are opposite), the triangle has extremely strong stability. Therefore, while the lower part of the bottom protection plate absorbs energy, the upper layer plate 2 connected by the inclined ribs of the triangle also has extremely strong resistance to deformation. Through the structure of this embodiment, the function of preventing the intrusion of the battery cell can be achieved at point A.

[0051] (Ⅱ) As shown in Figure 6 , when a bottom ball impact is carried out at point B, the vertical rib formed by two adjacent rectangular cavities 61 between the middle layer plate 3 and the lower layer plate 4 is a solid structure and has relatively strong resistance to deformation; the middle between the upper layer plate 2 and the middle layer plate 3 is an inverted triangular inclined rib structure, which also has relatively strong resistance to deformation. Therefore, B has the resistance to deformation with two strengthening effects. Through the structure of this embodiment, the function of preventing the intrusion of the battery cell can be achieved at point B.

[0052] Through the specific protection principles of the above-mentioned point A impact position and point B impact position, it can be shown that this utility model has the functions of strengthening the bottom protection and preventing the intrusion of the battery cell.

[0053] As Figures 1 to 3 shown, in the embodiment of this utility model, the upper layer plate 2 includes a body part and a mounting part connected to the periphery of the body part. A plurality of mounting holes 1 are provided on the mounting part, and a strengthening part 5 is provided between the body part and the middle layer plate 3.

[0054] Through the above settings, the mounting part can fixedly connect the bottom protection plate with the four side plates of the battery box.

[0055] Preferably, in the embodiment of this utility model, the mounting hole 1 is a bolt hole.

[0056] As Figure 4 shown, in the embodiment of this utility model, the upper layer plate 2, the middle layer plate 3, the lower layer plate 4, the strengthening part 5 and the energy absorption part 6 are integrally formed. The above structure is compact and has no complex processing procedures, and mass production can be realized.

[0057] Preferably, the bottom protection plate in the embodiment of this utility model is an integrally formed aluminum profile.

[0058] It should be noted that in the embodiments of the present utility model, through the triangular reinforcing rib structure between the upper layer plate 2 and the middle layer plate 3 and the rectangular cavity structure between the middle layer plate 3 and the lower layer plate 4, the dual functions of the bottom guard plate to resist deformation and effectively absorb energy are achieved.

[0059] An embodiment of the present utility model provides a battery box, which includes the above-mentioned bottom guard plate, a plurality of side plates and a top plate, and the plurality of side plates are connected between the top plate and the bottom guard plate.

[0060] Specifically, in the embodiment of the present utility model, the number of the side plates is four, and the four side plates are sequentially connected end to end.

[0061] The above battery box has all the advantages of the above-mentioned bottom guard plate, which will not be elaborated here.

[0062] An embodiment of the present utility model provides a battery pack, which includes the above-mentioned battery box and a battery cell assembly located in the battery box.

[0063] The above battery pack has all the advantages of the above-mentioned battery box, which will not be elaborated here.

[0064] From the above description, it can be seen that the embodiments of the present utility model achieve the following technical effects: by providing three-layer plates, with a strengthening part provided between the upper layer plate and the middle layer plate, and an energy absorption part provided between the middle layer plate and the lower layer plate, the dual functions of upper part to resist deformation and lower part to absorb energy can be achieved, thereby avoiding the deformation of the bottom guard plate on the battery cell side under working conditions such as ball impact at the bottom, and also avoiding the problem of deformation caused by the impact of the bottom guard plate, and further avoiding the risk of the bottom guard plate deforming and invading the battery cell.

[0065] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0066] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0067] For the convenience of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the drawing with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawing for the device. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0068] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification, claims, and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here.

[0070] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A bottom guard plate of a battery pack, characterized in that, Comprising: an upper plate (2), a middle plate (3), a lower plate (4), a reinforcing part (5) located between the upper plate (2) and the middle plate (3), and an energy-absorbing part (6) located between the middle plate (3) and the lower plate (4), the reinforcing part (5) being configured to resist deformation, and the energy-absorbing part (6) being configured to absorb energy and buffer.

2. The bottom guard plate of the battery pack according to claim 1, characterized in that, The reinforcing part (5) includes a plurality of reinforcing members (51), the plurality of reinforcing members (51) are arranged along a first direction, each of the reinforcing members (51) is used to connect the upper plate (2) and the middle plate (3), each of the reinforcing members (51) is inclined between the upper plate (2) and the middle plate (3), and the inclination directions of two adjacent ones of the plurality of reinforcing members (51) are opposite.

3. The bottom guard plate of the battery pack according to claim 2, characterized in that Two adjacent ones of the plurality of reinforcing members (51) and the middle plate (3) enclose a positive triangular cavity (52), and two adjacent ones of the plurality of reinforcing members (51) and the upper plate (2) enclose a reverse triangular cavity (53), and the positive triangular cavities (52) and the reverse triangular cavities (53) are alternately arranged in the first direction.

4. The bottom guard plate of the battery pack according to any one of claims 1 to 3, characterized in that A plurality of rectangular cavities (61) are formed in the energy-absorbing part (6), and the plurality of rectangular cavities (61) are arranged at intervals along the first direction.

5. The bottom guard plate of the battery pack according to claim 4, characterized in that, A reinforcing member (62) is formed between two adjacent ones of the rectangular cavities (61), and two ends of the reinforcing member (62) are respectively connected to the middle plate (3) and the lower plate (4).

6. The bottom guard plate of the battery pack according to claim 5, characterized in that, When the reinforcing part (5) forms a plurality of positive triangular cavities (52) and a plurality of reverse triangular cavities (53), and the positive triangular cavities (52) and the reverse triangular cavities (53) are alternately arranged in the first direction, the plurality of positive triangular cavities (52) are correspondingly arranged with the plurality of rectangular cavities (61).

7. The bottom guard plate of the battery pack according to any one of claims 1 to 3, characterized in that The upper plate (2) includes a body part and a mounting part connected to the periphery of the body part, a plurality of mounting holes (1) are provided on the mounting part, and the reinforcing part (5) is provided between the body part and the middle plate (3).

8. The bottom guard plate of the battery pack according to any one of claims 1 to 3, characterized in that The upper plate (2), the middle plate (3), the lower plate (4), the reinforcing part (5) and the energy-absorbing part (6) are integrally formed.

9. A battery box, characterized in that, Comprising a bottom guard plate, a plurality of side plates and a top plate of the battery pack according to any one of claims 1 to 8, and the plurality of side plates are connected between the top plate and the bottom guard plate.

10. A battery pack, characterized in that, Comprising the battery box according to claim 9 and a battery cell assembly located in the battery box.

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