WO2017156771A1

WO2017156771A1 - Lower box body and battery box including same

Info

Publication number: WO2017156771A1
Application number: PCT/CN2016/076727
Authority: WO
Inventors: 马林; 陈亮美; 秦峰; 姜亮; 项延火
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2016-03-18
Filing date: 2016-03-18
Publication date: 2017-09-21

Abstract

The present application relates to the technical field of production of lithium ion batteries, in particular to a lower box body and a battery box including the lower box body. The lower box body comprises a shell and a reinforcing connection structure. The reinforcing connection structure comprises reinforcing connection members. The shell is enclosed by side walls, and a cavity is formed inside the shell. The shell is provided with connecting member perforations. The connecting member perforations are in communication with the cavity. The reinforcing connection members comprise a connecting member, a reinforcing member and a filling structure. The reinforcing member is provided in the cavity. The reinforcing member is provided with a connecting hole. The connecting member is connected to the connecting hole. The filling structure is used for filling a residual space of the cavity. The battery box comprises an upper cover, a battery pack and the lower box body. The battery pack is provided in the lower box body, and the battery pack is fixed to the lower box body. The upper cover closes the lower box body, and the upper cover is fixed to the lower box body. According to the present invention, on the one hand, the strength and the rigidity of the lower box body of the battery box can be guaranteed, and on the other hand, the weight of the battery box can be reduced, and the energy density is improved.

Description

Lower case and battery case containing the lower case

Technical field

The present application relates to the field of lithium ion battery production technology, and in particular, to a lower case and a battery case including the lower case.

Background technique

Nowadays, electric vehicles have become an important development direction of the automotive industry due to rising oil prices and fewer and fewer resources. However, installing a large number of power batteries on electric vehicles requires the production of cabinets to install these power batteries. Currently, the power battery boxes used in the automotive industry are generally made of metal materials. The metal battery box has the disadvantages of complicated structure, many processes, poor consistency, and large weight.

As a result, composite battery cases have emerged on the market, and complete composite battery boxes have the disadvantage of low stiffness.

In order to improve the rigidity of the composite battery case, a metal frame is mounted on the bottom of the lower case of the composite battery case. Although the metal frame is added, although the rigidity is increased, the weight of the battery case is also increased. For the whole vehicle, it will increase the weight of the whole vehicle, resulting in greater energy consumption.

Summary of the invention

The present application provides a lower case and a battery case including the lower case, which can ensure the strength and rigidity of the lower case of the battery case, and can reduce the weight of the battery case and increase the energy density.

The present application provides a lower case including a housing and a reinforcing connecting structure, the reinforcing connecting structure including at least one reinforcing connecting member,

The housing is a structure in which one end of the side wall and the bottom plate are open, and the inside of the housing is provided with a cavity, the housing is provided with a connecting piece perforation, the connecting piece is perforated and the The cavity is connected,

The reinforcing connecting member includes a connecting member, a reinforcing member and a filling structure, wherein the reinforcing member is disposed in the cavity, and the reinforcing member is provided with a connecting hole corresponding to the through hole of the connecting member, The connecting member is coupled to the connecting hole, and the filling structure fills a remaining space of the cavity.

Preferably, the reinforcing connecting structure comprises a first reinforcing connecting member, the cavity comprises a first chamber, the connecting piece perforation comprises a first connecting piece perforation, and is in communication with the first chamber,

The first reinforcing connecting member includes a first connecting member, a first reinforcing member, and a first filling structure,

The first chamber is located in the side wall, the first connecting member is perforated on a bottom surface of the side wall, and is in communication with the first chamber, and the first reinforcing member is disposed on the first portion a first connecting hole corresponding to the first connecting piece through hole is disposed in the first reinforcing member, the first connecting member is connected to the first connecting hole, and the first filling structure is filled The remaining space of the first chamber.

Preferably, the reinforcing connection structure further comprises a second reinforcing connecting member, the cavity comprises a second chamber, the connecting piece perforation comprises a second connecting piece perforation, and is in communication with the second chamber,

The second reinforcing connecting member includes a second connecting member, a second reinforcing member, and a second filling structure,

The second chamber is located in the bottom plate, the second connecting member is perforated on a top surface of the bottom plate, and the second reinforcing member is disposed in the second chamber, on the second reinforcing member A second connection hole corresponding to the second connector through hole is provided, the second connection member is connected to the second connection hole, and the second filling structure fills a remaining space of the second chamber.

Preferably, the reinforcing joint structure further includes a reinforcing rib disposed in the casing.

Preferably, the reinforcing connection structure further comprises a third reinforcing connecting member, the cavity comprises a third chamber, the connecting piece perforation comprises a third connecting piece perforation, and is in communication with the third chamber,

The third reinforcing connecting member includes a third connecting member, a third reinforcing member, and a third filling structure,

The third chamber is located in the side wall, the third connecting member is perforated on a top surface of the side wall, the third reinforcing member is disposed in the third chamber, the third reinforcement a third connecting hole corresponding to the third connecting piece perforation is disposed on the piece, the third connecting piece is connected to the third connecting hole, and the third filling structure fills a remaining space of the third chamber .

Preferably, the reinforcing connecting structure includes the first reinforcing connecting member, the second reinforcing connecting member and the third reinforcing connecting member,

The first chamber, the second chamber, and the third chamber are integrally disposed.

Preferably, the cavity fills the interior of the housing.

Preferably, the connecting piece is connected to the connecting hole by means of gluing or screwing.

Preferably, the connecting member is a self-tapping screw sleeve.

Based on the lower case, the present application further provides a battery case including an upper cover, a battery pack, and a lower case, the battery pack is disposed in the lower case, and the battery pack and the lower case The upper cover covers the lower case, and the upper cover is fixed to the lower case.

The technical solution provided by the present application can achieve the following beneficial effects:

The lower case provided by the present application and the battery case including the lower case can ensure the strength and rigidity of the lower case of the battery case on the one hand, and reduce the weight of the battery case and increase the energy density on the other hand.

The above general description and the following detailed description are merely exemplary and are not intended to limit the application.

DRAWINGS

1 is a schematic overall structural view of a lower case provided by a first embodiment of the present application;

Figure 2 is an enlarged schematic view of a portion A of Figure 1;

3 is a schematic structural view of a bottom portion of a lower case provided by the first embodiment of the present application;

4 is a schematic exploded view showing the structure of a lower case provided by the first embodiment of the present application;

Figure 5 is a plan view of the lower case provided by the first embodiment of the present application;

Figure 6 is a cross-sectional view taken along line E-E of Figure 5;

Figure 7 is an enlarged schematic view of a portion C of Figure 6;

Figure 8 is a cross-sectional view taken along line F-F of Figure 5;

Figure 9 is an enlarged schematic view of a portion B of Figure 8;

10 is a schematic overall structural view of a lower case provided by a second embodiment of the present application;

Figure 11 is a schematic exploded view showing the structure of the lower case provided by the second embodiment of the present application;

Figure 12 is a cross-sectional view taken along line B-B of Figure 10;

Figure 13 is an exploded perspective view of the components of Figure 12;

FIG. 14 is a schematic diagram of the overall structure of a battery case according to an embodiment of the present application.

The drawings herein are incorporated in and constitute a part of the specification,

detailed description

The present application will be further described in detail below through specific embodiments and with reference to the accompanying drawings. The terms "front", "back", "left", "right", "upper", and "lower" as used herein refer to the state in which the lower case in the drawing and the battery case including the lower case are placed.

As shown in FIG. 1 to FIG. 4 , the lower case 10 provided by the present application includes a housing 101 and a reinforced connection structure, and the housing 101 has a structure in which one end surrounded by the side wall 1011 and the bottom plate 1012 is open, and the shell is opened. The interior of the body 101 is provided with a cavity, and a connector perforation is provided on the housing 101, the connector perforation being in communication with the cavity. The reinforcing connecting structure comprises at least one reinforcing connecting member, the reinforcing connecting member comprises a connecting member, a reinforcing member and a filling structure, wherein the reinforcing member is disposed in the cavity for local reinforcement, and the reinforcing member is provided with a connecting hole corresponding to the through hole of the connecting member, and the connecting portion is connected The piece is connected to the connecting hole, and the filling structure can fill the remaining space of the cavity to fix the position of the reinforcing member. Finally, a bolt or the like can be passed through the outer member and the connector is perforated and threaded with the connector to connect the outer member to the lower case 10. The reinforcing connection structure, the cavity, and the connector through-holes in this embodiment may be disposed at any position of the housing 101 for connection with different external components.

In particular, the reinforcing connection structure comprises at least one first reinforcing connecting member, the connecting piece perforation comprising at least one first connecting piece perforation 111a. The first reinforcing connecting member includes a first reinforcing member 112a, a first filling structure 113a, and a first connecting member 114a. The cavity formed by the side wall 1011 of the housing 101 includes a first chamber. The first connecting member through hole 111a is disposed on the bottom surface of the side wall 1011 and communicates with the first chamber. The first reinforcing member 112a is disposed at the first portion. a first connecting hole (not labeled) corresponding to the first connecting piece through hole 111a is disposed in the first reinforcing member 112a, and the first connecting member 114a is connected to the first connecting hole, and the first filling structure 113a is filled with the first The remaining space of the chamber.

The first connecting member 114a is for screwing with an external connecting member (not shown) such as a screw or a bolt, and the external connecting member such as a screw or a bolt can sequentially pass through the outer member and the first connecting member through hole 111a and the first The connecting member 114a is screwed so that the outer member is coupled to the lower case 10. The external part here is the body of the car.

As shown in FIG. 4, the reinforcing connecting structure in this embodiment further includes at least one second reinforcing connecting member, and the connecting member through hole includes at least one second connecting member through hole 111b. Second enhanced connection The member includes a second reinforcement member 112b, a second filling structure 113b, and a second connection member 114b. The cavity formed by the bottom plate 1012 of the housing 101 includes a second chamber, and the second connector through hole 111b is disposed on the top surface of the bottom plate 1012 and communicates with the second chamber. The second reinforcing member 112b is disposed in the second chamber, and the second reinforcing member 112b is provided with a second connecting hole (not labeled) corresponding to the second connecting member through hole 111b, and the second connecting member 114b and the second connecting hole Connecting, the second connecting member 114b here can also be screwed with a screw or a bolt, and a hole corresponding to the second connecting member 114b is also provided on the battery pack 30 (shown in FIG. 14), and the screw or the bolt is sequentially worn. The hole in the battery pack 30 and the second connector through hole 111b on the casing 101 are screwed to the second connecting member 114b, thereby connecting the casing 101 to the internal battery pack 30. The second filling structure 113b fills the remaining space of the second chamber.

In addition, a reinforcing rib 115 may be disposed in the housing 101. For example, the reinforcing rib 115 may be disposed in the second chamber. After the second filling structure 113b fills the remaining space of the second chamber, the reinforcing ribs 115 are distributed in the second chamber. The second filling structure 113b is inside. In the embodiment shown in FIG. 4, the reinforcing ribs 115 may be plural, and the plurality of reinforcing ribs 115 are vertically and horizontally staggered. Among them, the reinforcing rib 115 is preferably made of a composite material, or a low-density metal material, an alloy material or a wood material. The reinforcing rib 115 can improve the overall rigidity of the box body, meet the bearing requirements of the battery pack 30, reduce the local stress concentration of the composite material, and ensure the local structural strength.

In this embodiment, the side wall 1011 of the housing 101 may further include a third chamber, and a third reinforcing connecting member is disposed in the third chamber, and the connecting member through hole further includes at least one third connecting member through hole 111c. The third reinforcing connecting member includes a third reinforcing member 112c, a third filling structure 113c, and a third connecting member 114c. The third connecting member through hole 111c is disposed on the top surface of the side wall 1011 and communicates with the third chamber. . The third reinforcing member 112c is disposed in the third chamber, and the third reinforcing member 112c is provided with a third connecting hole (not labeled) corresponding to the third connecting member through hole 111c, and the third connecting member 114c and the third connecting hole connection. Here, the third connecting member 114c may also be screwed to the screw or the bolt, and the upper cover 20 (shown in FIG. 14) is also provided with a hole corresponding to the third connecting member 114c, and the screw or the bolt is sequentially passed through. The hole in the cover 20 and the third connector through hole 111c on the housing 101 are screwed to the third connecting member 114c, thereby connecting the housing 101 to the upper cover 20. . The third filling structure 113c fills the remaining space of the third chamber. Wherein, the first reinforcement member 112a, the second reinforcement member 112b and the third reinforcement member 112c are generally wood materials, metal materials, alloy materials, composite materials or foam materials, where the metal materials are The alloy material is preferably a low density metal or alloy such as aluminum, aluminum alloy or aluminum magnesium alloy. The low-density metal and the alloy have high strength and are used in the lower casing 10 of the battery box, which can effectively improve the rigidity and strength of the joint, and ensure that the lower casing 10 does not break under the impact load, and the joint is at the joint. The structure is intact and the connection site is not invalid.

By replacing the conventional metal frame in this way, the rigidity of the lower case 10 of the battery case can be ensured, and the arrangement can reduce the weight of the battery case as compared with the conventional metal frame. Among them, the reinforcing member has high strength and high strength, which can improve the rigidity and strength of the joint with the connecting member, and ensure that the lower casing 10 does not break under the impact load and the vibration load, and the connecting rubber layer is intact, thereby Ensure that the connection site does not expire.

In this embodiment, the connecting members may be connected to the respective connecting holes by means of an adhesive or a screw connection. For example, when the connecting member is a common screw sleeve, the adhesive can be bonded and fixed with the connecting hole, and when the self-tapping screw sleeve is used, the self-tapping screw sleeve can be directly screwed into the connecting hole for fastening connection. The self-tapping screw connection can reduce the bonding curing time and shorten the processing cycle.

When connecting with an adhesive, a hexagonal groove can be provided on the perforation of the connector, and the size and shape of the hexagonal groove are adapted to the end of the connector, that is, the connector passes through the connector through the perforation. After the inside of the reinforcing member, the outer edge of the end of the connecting member coincides with the inner edge of the hexagonal groove, thereby preventing the connecting member from rotating again. When using a self-tapping screw, there is no need to set a hexagonal groove. Moreover, the hexagonal groove does not necessarily have to have a hexagonal shape, such as a quadrangle or a triangle.

As shown in FIG. 5, a plurality of first reinforcing members 112a are disposed on the side wall 1011 of the lower casing 10, and a plurality of first connecting members 114a corresponding to the plurality of first reinforcing members 112a are also plural, and a plurality of first connections are provided. The piece 114a mates with its corresponding first reinforcement 112a such that the body is fixed to the lower case 10.

In the prior art, a through hole is directly provided in the casing 101. When the vehicle body is connected, a force is applied to the casing 101, which causes cracking of the casing 101, thereby damaging the lower casing 10. In the present application, since the force is always applied to the first reinforcement member 112a when it is fixed, and the first reinforcement member 112a is made of a wood material, a metal material, an alloy material, a composite material or a foam material, it is capable of The housing 101 is prevented from being cracked, thereby ensuring that the lower case 10 is not damaged.

The second reinforcing member 112b is also disposed at a plurality of bottoms of the lower case 10, and the second connecting member 114b disposed at the bottom of the lower case 10 is also a plurality, and the plurality of second connecting members 114b and the corresponding second plus The strong member 112b is engaged so that the battery pack 30 is fixed to the case. Also, this can prevent the casing 101 from being cracked, and a plurality of second reinforcing members 112b can be provided, which can further serve the purpose of reinforcement and further increase the rigidity.

As shown in FIG. 6 and FIG. 7, the number of the first connector through holes 111a is two, and is respectively disposed on the top surface of the side wall 1011 and the bottom surface of the side wall 1012, and the two first connector through holes 111a are oppositely disposed, and Both are in communication with the first chamber.

As shown in FIG. 8 and FIG. 9, the number of the second connector through holes 111b is two, and is respectively disposed on the top surface and the bottom surface of the bottom plate 1012, and the two second connector through holes 111b are oppositely disposed, and both are opposite to the second cavity. The rooms are connected.

10 to 13 show another embodiment of the present application, in which the reinforcing rib 115 is located between the second reinforcing member 112b and the bottom surface of the bottom plate 1012.

As shown in FIG. 14, the present application further provides a battery case including an upper cover 20, a battery pack 30, and a lower case 10. The battery pack 30 is disposed in the lower case 10, and the battery pack 30 and the lower case 10 are disposed. The upper cover 20 covers the lower case 10, and the upper cover 20 is fixed to the lower case 10.

In the present application, the molding of the structure of the lower case 10 is achieved by a molding process.

The manufacturing process of the lower case 10 of the present application is as follows:

1) Material selection: According to the physical and chemical performance requirements, the reinforcing materials, resins and sandwich cores are selected mainly according to the strength, rigidity, surface quality and corrosion performance requirements.

2) Shell 101: A composite material may be used, and the ratio of fiber to resin, that is, the content of fiber, is designed according to the strength requirement of the composite material; according to the load region, the impact load region is locally strengthened, and sufficient fiber layer is laid in the region. , that is, enough composite felt, chopped strand mat, mesh cloth, unidirectional cloth, roving roving cloth, surface felt, preformed embryo, fabric, fiber premix, pre-invasive tape, which is long fiber, short fiber And their combinations. The thickness of the composite is then designed. The design has a design thickness of 0.5 mm to 10 mm.

3) Place a structure such as a reinforcing member and a reinforcing rib in the mold, and wrap it in a composite material casing.

4) Molding, curing after resin transfer, to ensure the size and performance of the box structure is stable.

5) After the box is formed, punch holes and install the connectors.

In the present application, the housing 101 has a high strength and can satisfy the rigidity of the lower case of the battery. The reinforcing material of the casing 101 is in the form of composite felt, chopped strand mat, mesh cloth, unidirectional cloth, roving cloth, surface felt, preformed embryo, fabric, fiber premix, pre-invasive tape, which is long fiber. Short Fiber and its combination.

Wherein, the reinforcing material of the casing 101 is made of glass fiber, aramid fiber, carbon fiber, boron fiber, natural fiber, ultra high molecular weight polyethylene fiber and a combination thereof.

The resin base of the casing 101 is made of epoxy resin, phenolic resin, unsaturated polyester, vinyl ester, bismaleimide, polyimide, cyanate resin, polyphenylene sulfide, polypropylene, polyether. Ketones, polyether ketones, and combinations thereof. In general, the composite material has a structural fiber content of 10% to 80%. The thickness of the casing 101 is 0.5 mm to 10 mm.

The material of the filling structure may be a wood material, a metal material, an alloy material, a foam material or a composite material. Among them, the foam material can be selected from polyvinyl chloride foam (PVC foam), polystyrene foam (PS foam), polyurethane foam (PU foam), polymethacrylamide foam (acrylic foam), styrene acrylonitrile copolymer foam (SAN). Foam), polymethacrylimide foam (PMI foam) and combinations thereof.

The filling structure is used for improving the overall rigidity and strength of the lower casing 10 due to its low density and a certain structural strength. Because of its low density, it can reduce the weight of the battery case and increase the energy density of the battery box.

In other embodiments of the present application, the first chamber, the second chamber, and the third chamber may be integrally provided, and the occupied space may be enlarged as much as possible to fill the inside of the casing 101 with the cavity. This enables more filling structures to be filled to reduce the weight of the lower case 10.

The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and various changes and modifications may be made to the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application are intended to be included within the scope of the present application.

Claims

A lower case, comprising: a housing and a reinforcing connecting structure, the reinforcing connecting structure comprising at least one reinforcing connecting member,

The housing is a structure in which one end of the side wall and the bottom plate are open, and the inside of the housing is provided with a cavity, the housing is provided with a connecting piece perforation, the connecting piece is perforated and the The cavity is connected,

The reinforcing connecting member includes a connecting member, a reinforcing member and a filling structure, wherein the reinforcing member is disposed in the cavity, and the reinforcing member is provided with a connecting hole corresponding to the through hole of the connecting member, the connecting member and the connecting member are The connection holes are connected, and the filling structure fills a remaining space of the cavity.
The lower case according to claim 1, wherein the reinforcing connection structure comprises a first reinforcing connecting member, the cavity comprises a first chamber, the connecting piece perforation comprises a first connecting piece perforation, and Communicating with the first chamber,

The first reinforcing connecting member includes a first connecting member, a first reinforcing member, and a first filling structure,

The first chamber is located in the side wall, the first connecting member is perforated on a bottom surface of the side wall, and is in communication with the first chamber, and the first reinforcing member is disposed on the first portion a first connecting hole corresponding to the first connecting piece through hole is disposed in the first reinforcing member, the first connecting member is connected to the first connecting hole, and the first filling structure is filled The remaining space of the first chamber.
The lower case according to claim 2, wherein the reinforcing connecting structure further comprises a second reinforcing connecting member, the cavity comprises a second chamber, and the connecting piece perforation comprises a second connecting piece perforation, And communicating with the second chamber,

The second reinforcing connecting member includes a second connecting member, a second reinforcing member, and a second filling structure,

The second chamber is located in the bottom plate, the second connecting member is perforated on a top surface of the bottom plate, and the second reinforcing member is disposed in the second chamber, on the second reinforcing member A second connection hole corresponding to the second connector through hole is provided, the second connection member is connected to the second connection hole, and the second filling structure fills a remaining space of the second chamber.
The lower case according to claim 3, wherein the reinforcing connection structure A rib is also included, the rib being disposed within the housing.
A lower case according to claim 2 or 3, wherein said reinforcing connection structure further comprises a third reinforcing connecting member, said cavity comprising a third chamber, said connecting member perforation comprising a third connecting member Perforating and communicating with the third chamber,

The third reinforcing connecting member includes a third connecting member, a third reinforcing member, and a third filling structure,

The third chamber is located in the side wall, the third connecting member is perforated on a top surface of the side wall, the third reinforcing member is disposed in the third chamber, the third reinforcement a third connecting hole corresponding to the third connecting piece perforation is disposed on the piece, the third connecting piece is connected to the third connecting hole, and the third filling structure fills a remaining space of the third chamber .
The lower case according to claim 5, wherein the reinforcing connecting structure includes the first reinforcing connecting member, the second reinforcing connecting member, and the third reinforcing connecting member,

The first chamber, the second chamber, and the third chamber are integrally disposed.
The lower case according to claim 1, wherein the cavity fills the inside of the housing.
The lower case according to claim 1, wherein the connecting member is connected to the connecting hole by means of gluing or screwing.
The lower case according to claim 8, wherein the connecting member is a self-tapping screw.
A battery case, comprising: an upper cover, a battery pack, and the lower case according to any one of claims 1 to 9,

The battery pack is disposed in the lower case, and the battery pack is fixed to the lower case;

The upper cover covers the lower case, and the upper cover is fixed to the lower case.