CN215578832U

CN215578832U - Bottom plate, battery box and battery package

Info

Publication number: CN215578832U
Application number: CN202120863780.8U
Authority: CN
Inventors: 谭本学
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2022-01-18
Anticipated expiration: 2031-04-25

Abstract

The utility model is suitable for the technical field of batteries, and provides a bottom plate, a battery box and a battery pack, wherein the bottom plate comprises: a first plate having a first support surface; the second plate is connected with the first plate and is provided with a second supporting surface, and the second supporting surface is opposite to the first supporting surface and is arranged at intervals; the reinforcing rib extends from the second supporting surface to the first supporting surface, and a buffering gap is formed between the reinforcing rib and the first supporting surface; at least one reinforcing rib and the second plate jointly form a plurality of accommodating cavities; and the energy absorbing pieces are arranged between the first supporting surface and the second supporting surface and at least partially arranged in the accommodating cavity. The rigidity of the bottom plate is large, the bottom plate is not easy to deform, and the battery module can be effectively protected.

Description

Bottom plate, battery box and battery package

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a bottom plate, a battery box and a battery pack.

Background

The battery box generally includes a frame body and a bottom plate fitted in the frame body. At present, a common bottom plate is formed by welding a plurality of aluminum extruded sections, but because the number of the aluminum extruded sections is large, the bottom plate has a plurality of welding lines, the bottom plate is easy to deform during welding, and the strength of the welding lines is weak, so that the rigidity of the bottom plate is small; the other bottom plate is a foamed aluminum or honeycomb aluminum composite plate, but the composite plate on the upper layer is a flat plate with larger size, so the rigidity of the bottom plate is still smaller.

SUMMERY OF THE UTILITY MODEL

The utility model provides a bottom plate, a battery box and a battery pack, and aims to solve the problem that the rigidity of the bottom plate is low in the prior art.

An embodiment of the first aspect of the utility model provides a backplane comprising:

a first plate having a first support surface;

the second plate is connected with the first plate and is provided with a second supporting surface, and the second supporting surface is opposite to the first supporting surface and is arranged at intervals; and

the reinforcing rib extends from the second supporting surface to the first supporting surface, and a buffering gap is formed between the reinforcing rib and the first supporting surface; at least one reinforcing rib divides a plurality of accommodating cavities on the second plate;

the energy absorbing pieces are arranged between the first supporting surface and the second supporting surface and at least partially arranged in the corresponding accommodating cavity.

By adopting the technical scheme, the bottom plate comprises the first plate and the second plate, and the second plate is provided with the reinforcing ribs, so that the bottom plate has higher rigidity; because a plurality of energy-absorbing pieces are arranged between the first supporting surface of the first plate and the second supporting surface of the second plate, and at least part of the energy-absorbing pieces are contained in the containing cavity, when the bottom plate is impacted, the energy-absorbing pieces can play the roles of energy absorption and buffering, the second plate of the bottom plate is not easy to deform, and then the battery module borne above the bottom plate is protected. Therefore, the rigidity of the battery box is large, the battery box is not prone to deformation, the requirement of a ball impact test can be met, impact energy to the battery module can be reduced in use, and the battery module is well protected.

In one embodiment of the present application, the energy absorbing member is a metal matrix, and a plurality of holes are distributed in the metal matrix.

Through adopting above-mentioned technical scheme, when energy-absorbing piece received the impact, energy-absorbing piece will be conquamated to the shock energy is absorbed, vibrations, extrusion and the clash intensity that battery module received in the reduction battery package by a wide margin.

In one embodiment of the present application, the energy absorbing member is foamed aluminum or honeycomb aluminum.

By adopting the technical scheme, the energy absorption piece not only has better rigidity, but also can play a better role in energy absorption and buffering.

In one embodiment of the present application, both ends of each energy absorbing member abut against the first supporting surface and the second supporting surface.

By adopting the technical scheme, the energy absorption piece can be provided with a larger height, and the energy absorption and buffering effects are improved.

In one embodiment of the application, the buffer gap between the reinforcing rib and the first supporting surface is 3mm-5 mm.

By adopting the technical scheme, the energy absorbing part is positioned in the buffer gap to form the energy absorbing layer, the energy absorbing part and the reinforcing ribs which are positioned in the accommodating cavity form the rigid layer together, when the first plate is impacted, a large amount of impact energy can be absorbed through the energy absorbing layer, the rigidity of the reinforcing ribs has larger rigidity, the second plate can be prevented from being jacked and deformed when the energy absorbing part is crushed, and the battery module above the second plate is protected from being extruded.

In one embodiment of the present application, the number of the reinforcing ribs is plural, and the plural reinforcing ribs are arranged in a criss-cross manner.

Through adopting above-mentioned technical scheme, the rigidity of second board can effectively be promoted to a plurality of strengthening ribs, and a plurality of holding chambers that connect gradually can be injectd jointly with the second board to a plurality of strengthening ribs.

In one embodiment of the present application, the first plate and the second plate are both aluminum plates; and/or the presence of a gas in the gas,

the reinforcing ribs and the second plate are of an integrated structure formed by die casting.

By adopting the technical scheme, the weight of the bottom plate is light; and the second plate and the reinforcing ribs can be integrally formed by an aluminum die-casting process, so that the second plate and the reinforcing ribs are convenient to form and high in rigidity.

An embodiment of the second aspect of the present invention provides a battery box, including: the base plate according to an embodiment of the first aspect, and a frame body mounted on a periphery of the base plate.

Above-mentioned battery box accessible bottom plate bears the battery module, and the rigidity of bottom plate is great, can play the guard action to the battery module.

An embodiment of the third aspect of the present invention provides a battery pack, including: the battery case according to the embodiment of the second aspect; and the battery module is at least partially arranged in the frame body of the battery box and positioned above the bottom plate.

Above-mentioned battery package includes battery box and battery module, and the battery box has the advantage that weight is lighter, rigidity is great, non-deformable, and bottom plate in the battery box can play the guard action to the battery module, effectively reduces impact energy to the battery box can effectively protect the battery module, makes the battery module can the steady operation, and the security is higher.

In one embodiment of the present application, the second plate of the base plate is disposed between the battery module and the first plate of the base plate in a thickness direction of the battery pack.

Through adopting above-mentioned technical scheme, when carrying out the ball test, first board receives the impact of impact ball, and energy-absorbing piece is crushed and absorbs a large amount of impact energy, and the second board then can not warp or only have slight deformation to the battery module of protection second board top.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic exploded perspective view of a battery box according to an embodiment of the present invention;

FIG. 2 is a top plan view of the bottom plate in the battery box shown in FIG. 1;

FIG. 3 is an exploded perspective view of the base plate shown in FIG. 2;

FIG. 4 is a schematic view of the construction of the second plate and reinforcing bars in the base plate shown in FIG. 3;

FIG. 5 is a schematic view of the construction of the energy absorbing member of the base plate of FIG. 3;

FIG. 6 is a cross-sectional view of the base plate shown in FIG. 2 taken along line VI-VI;

fig. 7 is a schematic diagram of a bottom plate provided in an embodiment of the utility model during a bottom ball impact test.

The designations in the figures mean:

100. a battery box; 10. a base plate; 11. a first plate; 111. a first support surface; 12. a second plate; 121. a second support surface; 122. a frame edge; 13. reinforcing ribs; 14. an energy absorbing member; 15. an accommodating chamber; 20. a frame body; 200. impact the ball.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, which are examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

To illustrate the technical solution of the present invention, the following description is made with reference to the specific drawings and examples.

Referring to fig. 1, an embodiment of a first aspect of the present invention provides a base plate 10, wherein the base plate 10 is assembled on a frame 20.

Referring to fig. 2 to 6, the base plate 10 includes a first plate 11, a second plate 12, at least one rib 13, and a plurality of energy absorbing members 14.

The first plate 11 has a first support face 111; the second plate 12 is connected to the first plate 11 and has a second supporting surface 121, and the second supporting surface 121 is opposite to and spaced apart from the first supporting surface 111. Alternatively, the first plate 11 and the second plate 12 are both aluminum plates and are light in weight, but not limited thereto, and the first plate 11 and the second plate 12 may also be made of other materials, such as aluminum alloy, etc.

The reinforcing ribs 13 extend from the second supporting surface 121 to the first supporting surface 111, and a buffer gap is formed between the reinforcing ribs and the first supporting surface 111, that is, one side of each reinforcing rib 13 is connected to the second supporting surface 121, and the other side of each reinforcing rib 13 is spaced from the first supporting surface 111; as shown in fig. 4, at least one reinforcing rib 13 delimits a plurality of receiving chambers in the second plate 12, i.e. the reinforcing rib 13 and the second support surface 121 together enclose a plurality of receiving chambers 15.

As the ribs 13 extend from the second support surface 121 towards the first support surface 111, the ribs 13 define a plurality of receiving cavities 15 on the second plate 12. It can be understood that when the number of the reinforcing ribs 13 is one, the number of the accommodating cavities 15 is two; when the number of the reinforcing ribs 13 is more than one, the number of the accommodating chambers 15 may be more than two. The density of the reinforcing ribs 13 can be adjusted according to the bottom ball impact test requirements of different projects.

Each energy absorbing element 14 is arranged between the first support surface 111 and the second support surface 121 and at least partially in the respective receiving chamber 15. The energy absorbing piece 14 can play the roles of energy absorption and buffering; since the energy absorbing member 14 is a plurality of small pieces and is respectively disposed in the corresponding accommodating cavities 15, the small-sized energy absorbing member 14 is easy to manufacture; when the energy absorbing piece 14 in one accommodating cavity 15 is damaged, only the damaged energy absorbing piece 14 needs to be replaced, and the maintenance is convenient.

The above-described base plate 10 is used in a battery pack to support and protect battery modules in the battery pack. Because the bottom plate 10 comprises the first plate 11 and the second plate 12, and the second plate 12 is provided with the reinforcing ribs 13, the bottom plate 10 has higher rigidity; the first plate 11 and the second plate 12 can be made of light metal such as aluminum, and the weight is light; moreover, since the plurality of energy absorbing members 14 are disposed between the first supporting surface 111 of the first plate 11 and the second supporting surface 121 of the second plate 12, and at least part of the energy absorbing members are accommodated in the accommodating cavity 15, when the bottom plate 10 is impacted, the energy absorbing members 14 can absorb energy and buffer the impact, and the second plate 12 of the bottom plate 10 is not easily deformed, so as to protect the battery module supported above the bottom plate 10. Above-mentioned bottom plate 10 can solve the weight that battery box exists among the prior art heavier, the easy less problem of deformation and rigidity, and when bottom plate 10 received concentrated load, second board 12 non-deformable in the bottom plate 10 avoided will concentrate the load to transmit the battery module above bottom plate 10 and cause risk such as liquid cooling board weeping, battery module fire, explosion.

Referring to fig. 7, in a bottom ball impact test, since the thickness of the energy absorbing member 14 is greater than that of the reinforcing rib 13, the impact ball 200 crushes the energy absorbing member 14 at the bottom layer, and the rigidity of the second plate 12 is great under the action of the reinforcing rib 13, so that the second plate 12 is not jacked up to deform while the energy absorbing member 14 is crushed, and the liquid-cooled plate or the battery module inside the battery pack is protected from being squeezed. Also, the base plate 10 can also protect the liquid-cooled plate or the battery module inside the battery pack from being pressed when the base plate 10 is impacted in use. Therefore, the base plate 10 can satisfy the requirements of the bottom ball impact test.

In one embodiment, the energy absorbing member 14 is a metal matrix having a plurality of holes distributed therein. When the energy absorbing piece 14 is impacted, the energy absorbing piece 14 is crushed, and the impact energy is absorbed through the deformation of the energy absorbing piece 14, so that the vibration, extrusion and collision strength of the battery module in the battery pack are greatly reduced. It is understood that the energy absorbing member 14 can be made of other easily foamable materials, such as polymethacrylimide foam (PMI), polyvinyl chloride (PVC), etc.

Optionally, the energy absorbing member 14 is made of foamed aluminum or honeycomb aluminum, which has a good rigidity and can perform a good energy absorbing and buffering function. It will be appreciated that the energy absorbing member 14 may also be a foam aluminum alloy, or other metal matrix having holes or weight-reducing structures.

In an embodiment, both ends of each energy absorbing element 14 abut against the first support surface 111 and the second support surface 121, i.e. the height of the energy absorbing element 14 is equal to the distance between the first support surface 111 and the second support surface 121. In this case, the energy absorbing member 14 is partially disposed in the receiving chamber 15 formed by the reinforcing ribs 13 and the second plate 12, and partially disposed in the cushion gap. Thus, the energy absorbing piece 14 can be arranged at a larger height, and the energy absorbing and buffering effects are improved.

Alternatively, the height of the energy absorbing member 14 may be smaller than the distance between the first support surface 111 and the second support surface 121, for example, the first plate 11 is used as the lower plate, the second plate 12 is used as the upper plate, and the energy absorbing member 14 is disposed on the first plate 11 and is partially accommodated in the accommodating cavity 15. For another example, the first plate 11 is used as an upper plate, the second plate 12 is used as a lower plate, and the energy absorbing member 14 is located in the accommodating cavity 15 and spaced apart from the first plate 11, in which case, the energy absorbing member 14 can still play a certain role of energy absorption and buffering.

In one embodiment, the first plate 11 serves as a lower plate, the second plate 12 serves as an upper plate, and the second plate 12 is used for carrying the battery module. Optionally, the thickness of the first plate 11 is 1mm-2mm, the total thickness of the bottom plate 10 is 7mm-12mm, and the buffer gap between the reinforcing rib 13 and the first supporting surface 111 is 3mm-5 mm; the energy absorbing part 14 positioned in the buffer gap forms an energy absorbing layer B, the energy absorbing part 14 positioned in the accommodating cavity 15 and the reinforcing ribs 13 jointly form a rigid layer A, and the rigidity of the energy absorbing layer B is smaller than that of the rigid layer A. For example, if the height of the energy absorber 14 is 9mm, the height of the rib 13 is 5mm, and the cushioning gap between the rib 13 and the first support surface 111 is 4mm, the height of the energy absorbing layer B is 4mm, and the height of the rigid layer a is 5 mm. When the first plate 11 is impacted, the energy absorbing part 14 at the bottom layer is firstly crushed, namely, a large amount of impact energy is absorbed through the energy absorbing layer B, the rigid layer B where the reinforcing ribs 13 are located has higher rigidity, so that the second plate 12 is prevented from being jacked up and deformed while the energy absorbing part 14 is crushed, or even if the second plate 12 is jacked up and deformed, the deformation degree is very small and can be ignored, and the battery module above the second plate 12 is protected from being extruded.

In one embodiment, the number of the reinforcing ribs 13 is plural, and the plural reinforcing ribs 13 are arranged in a criss-cross manner. In this way, the plurality of reinforcing ribs 13 can effectively improve the rigidity of the second plate 12, and together with the second plate 12, define a plurality of accommodating cavities 15 connected in sequence.

Specifically, the plurality of reinforcing ribs 13 include first reinforcing ribs extending in the longitudinal direction of the first plate 11 and second reinforcing ribs extending in the width direction of the first plate 11, the first and second reinforcing ribs being vertically crossed in a lattice shape. Thus, the plurality of ribs 13 can cooperate with the second plate 12 to define a plurality of rectangular-shaped receiving cavities 15 for receiving the energy absorber 14. For example, the number of the accommodating cavities 15 is 30, and it is understood that the number of the accommodating cavities 15 can be set according to the requirement, and is not limited herein.

Alternatively, the ribs 13 are disposed perpendicular to the second support surface 121, it being understood that the ribs 13 may also be disposed obliquely to the second support surface 121.

It will be appreciated that the ribs 13 may be of equal or unequal size and may be designed depending on the configuration of the first and

second plates

11, 12.

In one embodiment, the first plate 11 is a flat plate; the second plate 12 is provided with a frame edge 122 along the periphery, and the frame edge 122 is fixedly connected with the first plate 11, so that the second plate 12 is shaped like a groove, and the first plate 11 is covered on the second plate 12 and encloses a containing space to contain the reinforcing ribs 13 and the energy absorbing piece 14. The first plate 11 is a flat plate which is easy to manufacture and the ribs 13 may be formed together with the second plate 12. Alternatively, the first supporting surface 111 and the second supporting surface 121 are arranged in parallel.

Optionally, the first panel 11 is welded to the rim 122 of the second panel 12. As such, there are fewer welds in the base plate 10 and greater strength.

In one embodiment, the first plate 11, the second plate 12 and the reinforcing ribs 13 are all made of aluminum, and/or; the reinforcing ribs 13 and the second plate 12 are formed as a single body by die-casting. Therefore, the weight of the floor panel 10 is light; and, the second plate 12 and the reinforcing ribs 13 can be integrally formed by an aluminum die-casting process, so that the forming is convenient and the rigidity is high. It is understood that the ribs 13 may be made of other metal materials or composite materials, and the ribs 13 may be connected to the second plate 12 by injection molding, pultrusion, hot pressing, and the like.

In one embodiment, the ribs 13 may also be provided on the first plate 11; or, the reinforcing ribs 13 on the first plate 11 and the second plate 12 are simultaneously arranged on the first plate 11 and the second supporting surface 121, and the reinforcing ribs 13 on the second plate 12 and the first supporting surface 111 also have buffer gaps, so that an energy absorption layer is formed between the reinforcing ribs 13 on both sides.

When the bottom plate 10 is used, if the bottom plate 10 is impacted, the energy absorbing piece 14 is crushed due to the fact that the height of the energy absorbing piece 14 is higher than that of the reinforcing rib 13, and under the action of the reinforcing rib 13, the rigidity of the second plate 12 is high, so that the bearing plate can be prevented from being jacked up and deformed while the energy absorbing piece 14 is crushed, and a liquid cooling plate or a battery module in the battery pack is further protected from being extruded.

Compared with a bottom guard plate made of a steel plate, the bottom plate 10 is light in weight, and the first plate 11, the second plate 12 and the reinforcing ribs 13 in the bottom plate 10 can be made of aluminum; compared with the method that the bottom guard plate is made of aluminum profile in a tailor welding mode, the bottom plate 10 does not need to be subjected to excessive welding procedures, and the overall strength is high; compared with the adoption of a foamed aluminum or honeycomb aluminum composite plate, the rigidity of the second plate 12 in the bottom plate 10 is much higher, so that the second plate 12 cannot be jacked up and deformed while the energy absorbing element 14 is crushed, and a liquid cooling plate or a battery module in the battery pack is further protected from being extruded; meanwhile, the energy absorbing piece 14 is divided into a plurality of small pieces, so that the energy absorbing piece is easier to manufacture; in terms of maintenance, if the energy absorbing member 14 of one accommodating cavity 15 is damaged, only the energy absorbing member 14 in the accommodating cavity 15 needs to be replaced, so that the maintenance is convenient and the maintenance cost is low.

Referring to fig. 1 again, a second aspect of the present application provides a battery box 100, including a bottom plate 10 and a frame 20 according to the first embodiment, wherein the frame 20 is mounted on a periphery of the bottom plate 10. Above-mentioned battery box 100 accessible bottom plate 10 bears the battery package, and the rigidity of bottom plate 10 is great, can play the guard action to the battery module.

When manufacturing, firstly, the second plate 12 and the reinforcing ribs 13, and the reinforcing ribs 13 and the second plate 12 are manufactured through an aluminum die-casting process; the energy absorbing piece 14 is designed into small blocks which are respectively placed into the corresponding containing cavities 15; then, the first plate 11 is placed on the second plate 12, and then the second plate is placed in a brazing furnace to be welded, thereby forming a finished product of the base plate 10. Next, the peripheral edge of the base plate 10 is fixed to the frame 20, thereby producing the battery case 100.

A second aspect of the present application provides a battery pack, which includes the battery box 100 according to the first aspect of the present application and a battery module, wherein the battery module is at least partially disposed in the frame 20 of the battery box 100 and above the bottom plate 10.

During assembly, the bottom plate is fixed to the frame 20 from below the frame 20, and the battery module is fixed to the bottom plate 10 from above the frame 20.

In one embodiment of the present application, the second plate 12 of the base plate 10 is disposed between the battery module and the first plate 11 of the base plate 10 in the thickness direction of the battery pack. Thus, when the ball impact test is performed, the first plate 11 is impacted by the impact ball 200, the energy absorbing member 14 is crushed, and the second plate 12 is not deformed or only slightly deformed, so as to protect the battery module above the second plate 12. It is understood that the first plate 11 may be disposed between the battery module and the second plate 12.

Above-mentioned battery package, including battery box 100 and battery module, battery box 100 has the advantage that weight is lighter, rigidity is great, non-deformable, and bottom plate 10 among the battery box 100 can play the guard action to the battery module, effectively reduces impact energy to battery box 100 can effectively protect the battery module, makes the battery module can the steady operation, and the security is higher.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A backplane, comprising:

a first plate having a first support surface;

2. The panel of claim 1, wherein the energy absorbing member is a metal matrix having a plurality of holes distributed therein.

3. A floor panel according to claim 2, wherein said energy absorbing member is foamed aluminum or honeycomb aluminum.

4. A floor panel according to any of claims 1-3, wherein both ends of each energy absorbing element abut against the first and second support surfaces.

5. A base plate according to claim 4, wherein the cushioning gap between the reinforcing bars and the first support surface is between 3mm and 5 mm.

6. The bottom plate according to any one of claims 1 to 3, wherein the number of the reinforcing beads is plural, and the plural reinforcing beads are arranged in a criss-cross manner.

7. A floor panel as claimed in any one of claims 1 to 3, wherein said first and second panels are each aluminium panels; and/or

8. A battery box, comprising:

the base plate of any one of claims 1-7; and

a frame assembled to a periphery of the base plate.

9. A battery pack, comprising:

the battery case of claim 8; and

and the battery module is at least partially arranged in the frame body of the battery box and positioned above the bottom plate.

10. The battery pack according to claim 9, wherein the second plate of the base plate is disposed between the battery module and the first plate of the base plate in a thickness direction of the battery pack.