CN212085086U

CN212085086U - Box subassembly, group battery and vehicle

Info

Publication number: CN212085086U
Application number: CN202020746970.7U
Authority: CN
Inventors: 黄海华; 李盛林
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2020-12-04
Anticipated expiration: 2030-05-08

Abstract

The utility model relates to a box subassembly, group battery and vehicle. The utility model discloses a box subassembly includes: a lower box body having an accommodating space; the reinforcing member is arranged in the accommodating space and is fixedly connected with the lower box body; the mounting assembly is used for mounting the box body assembly and comprises a first sleeve and a second sleeve which are connected with each other, the first sleeve is connected to the lower box body and penetrates through the reinforcing member, and the second sleeve is fixedly connected to the reinforcing member. The utility model discloses a group battery includes the box subassembly. The utility model discloses a vehicle includes the group battery. First sleeve and the telescopic being connected of second and through being connected of second sleeve and strengthening member can disperse the atress of hookup location between first sleeve and the lower box, first sleeve passes through between second sleeve and the strengthening member can be connected firmly to improve the joint strength between carry subassembly and the box subassembly, and then improve the holistic joint strength of box subassembly and rigidity.

Description

Box subassembly, group battery and vehicle

Technical Field

The utility model relates to a battery field especially relates to a box subassembly, group battery and vehicle.

Background

Along with the development of the battery field technology, the size and the weight of the battery pack are larger and larger, the requirement on the integral vibration frequency of a box body of the battery pack and a vehicle after the battery pack is installed is higher and higher, a common hanging point of the battery pack connected with the vehicle is integrally formed by a sleeve and a nut which are used for connecting a lower box body and an upper cover of the battery pack, the transmission of force is transmitted only by the connection between the sleeve and the lower box body, the strength and the rigidity of the lower box body are very limited, when the battery pack is subjected to external load, the connection between the sleeve and the lower box body is easy to lose efficacy due to the local overlarge stress, the connection of the battery pack is made to lose efficacy, and the connection.

SUMMERY OF THE UTILITY MODEL

In view of the defects existing in the prior art, the utility model aims to provide a box subassembly, group battery and vehicle, its atress that can disperse hookup location between sleeve and the lower box effectively improves the holistic joint strength of box subassembly and rigidity.

In order to achieve the above object, in one aspect, the present invention provides a box assembly for a battery pack, the box assembly comprising: a lower box body having an accommodating space; the reinforcing member is arranged in the accommodating space and is fixedly connected with the lower box body; the mounting assembly is used for mounting the box body assembly and comprises a first sleeve and a second sleeve which are connected with each other, the first sleeve is connected with the lower box body and penetrates through the reinforcing member, and the second sleeve is fixedly connected with the reinforcing member.

In an embodiment, the second sleeve comprises a first connection portion for fixed connection with the reinforcement member.

In an embodiment, the mount assembly further comprises a first fastener for connecting the first connection portion and the reinforcement member.

In an embodiment, the box assembly further comprises an upper cover, and the second sleeve is fixedly connected with the upper cover.

In an embodiment, the second sleeve further includes a main body portion and a second connecting portion, the main body portion connects the first connecting portion and the second connecting portion and is located between the reinforcing member and the upper cover, and the second connecting portion is configured to be fixedly connected with the upper cover.

In an embodiment, the mounting assembly further comprises a second fastener for connecting the second connecting portion and the upper cover.

In an embodiment, the box assembly further includes a first sealing element, and the first sealing element is sleeved on the second connecting portion and located between the main body portion and the upper cover.

In an embodiment, the box assembly further comprises a second sealing member located in a space formed by the main body portion, the first connecting portion and the reinforcing member.

In order to achieve the above object, in another aspect, the present invention provides a battery pack, which includes a battery and the box assembly, wherein the battery is accommodated in the accommodating space of the lower box.

In order to achieve the above object, in still another aspect, the present invention provides a vehicle including a vehicle body, the foregoing battery pack, and a third fastener for passing through the first sleeve and the second sleeve of the mounting assembly and connecting with the vehicle body.

The utility model has the advantages as follows:

in the case assembly of the present application, a reinforcing member having higher strength and rigidity is provided in the lower case, a first sleeve connected to the lower case passes through the reinforcing member and is connected to the reinforcing member through a second sleeve, so that the first sleeve is not only connected to the lower case but also connected to the reinforcing member through the second sleeve, and when the case assembly is subjected to an external force, the first sleeve is connected to the reinforcing member having higher strength and rigidity through the second sleeve, and the stress of the case assembly is borne not only by the connection between the first sleeve and the lower case but also by the connection between the first sleeve and the second sleeve and by the connection between the first sleeve and the reinforcing member, so that the stress at the connection position between the first sleeve and the lower case can be dispersed, and the first sleeve and the reinforcing member can be stably connected through the second sleeve, thereby improve the joint strength between carry subassembly and the box subassembly, and then improve the holistic joint strength of box subassembly and rigidity. The battery pack using the box body assembly can be reliably connected with the vehicle through the mounting assembly, and the connection strength of the box body assembly and the vehicle is improved.

Drawings

Fig. 1 is a perspective view of an embodiment of a case assembly according to the present invention.

FIG. 2 is an exploded perspective view of an embodiment of the case assembly according to FIG. 1.

FIG. 3 is an exploded perspective view of the embodiment of the case assembly of FIG. 1 from another angle.

FIG. 4 is an assembly schematic of the upper cover, lower housing, reinforcing member, and mounting assembly of the embodiment of the housing assembly according to FIG. 1.

Fig. 5 is a perspective view of a second sleeve of the mounting assembly of the embodiment of the case assembly of fig. 1.

Fig. 6 is a perspective view of the second sleeve of fig. 5 from another angle.

Fig. 7 is a perspective view of a modification of the second sleeve of fig. 5.

Fig. 8 is a perspective view of the second sleeve of fig. 7 from another angle.

Fig. 9 is a perspective view of a first sleeve of the mounting assembly of the embodiment of the case assembly of fig. 1.

Wherein the reference numerals are as follows:

p case assembly 321 first connection portion

1 lower case 322 body part

11 receiving space 323 second connecting part

12 frame 33 first fastener

13 base plate 34 second fastener

2 reinforcing member 4 Upper cover

21 first stiffening beam 5 first seal

22 second stiffening beam 6 second seal

3 mount subassembly R screw

31 transverse to the first sleeve T

32 second sleeve L longitudinal

Detailed Description

The accompanying drawings illustrate embodiments of the present invention and it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means more than two (including two); unless otherwise specified or indicated. The term "connected" is to be interpreted broadly, e.g., "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation.

The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

The vehicle of the present application includes a vehicle body, a battery pack, and a third fastener. The battery pack is provided to the vehicle body, and the third fastener is used to connect the battery pack and the vehicle body to dispose the battery pack on the vehicle body. The vehicle is a new energy vehicle, which can be a pure electric vehicle, and can also be a hybrid electric vehicle or a range-extended vehicle. The vehicle main part is provided with driving motor, and driving motor is connected with the group battery electricity as the power supply, and the group battery is used for providing the electric energy, and driving motor passes through drive mechanism and is connected with the wheel in the vehicle main part to the drive car is marchd.

The battery pack may include a battery (not shown) and a case assembly P of the present application, in which the battery is received. The battery may be provided in plurality, and the plurality of batteries are arranged in the case assembly P.

The battery may be a hard-case battery (or referred to as a can-type battery), a pouch-type battery (or referred to as a pouch-type battery), or a cylindrical battery. The hard-shell battery includes an electrode assembly, a case, a top cap, an electrode terminal, an explosion-proof valve, a liquid injection hole, and the like. The case has an interior forming a receiving cavity to receive the electrode assembly and the electrolyte. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator film separating the positive electrode tab and the negative electrode tab. The pouch cell includes an envelope (formed, for example, of an aluminum plastic film), an electrode assembly (similar to the construction and molding of a hard-case battery), and tabs. The cylindrical battery includes a cylindrical can, an electrode assembly (similar to the hard-shell battery in construction and formation), and tabs. The type of the case assembly P is not limited, and as shown in fig. 1, the case assembly P is a disk-shaped case. However, the shape of the case assembly P is not limited, and the case assembly P may be a frame-shaped case or a box-shaped case.

Referring to fig. 1 to 4, a case assembly P of the present application for a battery pack includes a lower case 1, a reinforcing member 2, and a mounting assembly 3. The case assembly P may further include an upper cover 4, a first sealing member 5, and a second sealing member 6. The lower case 1 has a housing space 11. The reinforcing member 2 is disposed in the accommodating space 11, and the reinforcing member 2 is fixedly connected to the lower case 1. The mounting component 3 is used for mounting the box body component P. The mounting assembly 3 comprises a first sleeve 31 and a second sleeve 32 which are connected with each other, the first sleeve 31 is connected with the lower box body 1 and penetrates through the reinforcing member 2, and the second sleeve 32 is fixedly connected with the reinforcing member 2.

Because the bottom of the lower box body of the common box body is of a plate-shaped structure, the strength and the rigidity of the lower box body are low, if the box body is installed only through the sleeve connected to the lower box body, the stress of the box body is concentrated on the connecting position of the sleeve and the lower box body, the local stress of the connecting position is large, and the connection between the sleeve and the lower box body is easy to lose efficacy. When the shock vibration is applied, the connection strength between the sleeve and the lower box body cannot meet the requirement, so that the sleeve and the lower box body are disconnected. In the case assembly P of the present application, the reinforcing member 2 having higher strength and rigidity of itself is provided in the lower case 1, the first sleeve 31 connected to the lower case 1 passes through the reinforcing member 2 and is connected to the reinforcing member 2 through the second sleeve 32, so that the first sleeve 31 is connected not only to the lower case 1 but also to the reinforcing member 2 through the second sleeve 32, when the case assembly P is subjected to an external force, the first sleeve 31 is connected to the reinforcing member 2 having higher strength and rigidity through the second sleeve 32, the force of the case assembly P is borne not only by the connection between the first sleeve 31 and the lower case 3 but also by the connection between the first sleeve 31 and the second sleeve 32, and by the first sleeve 31 through the connection between the second sleeve 32 and the reinforcing member 2, thereby the force of the connection position between the first sleeve 31 and the lower case 1 can be dispersed, between first sleeve 31 and lower box 1, first sleeve 31 can be connected firmly through between second sleeve 32 and the reinforcing member 2 to improve the joint strength between carry subassembly 3 and the box subassembly P, and then improve the holistic joint strength and the rigidity of box subassembly P. The battery pack using the box body assembly P can be reliably connected with devices such as vehicles through the mounting assembly 3, and the connection strength of the box body assembly P and the vehicles is improved. In addition, the first sleeve 31 is restrained by the reinforcing member 2 and the second sleeve 32, so that the first sleeve 31 is stably positioned, the phenomenon that the first sleeve 31 shakes due to the limited connection strength with the lower box body 1 is avoided, and the connection strength of the box body assembly P is improved.

Referring to fig. 2, a battery (not shown) may be received in the receiving space 11 of the lower case 1. The material of the lower box body 1 can be aluminum, aluminum alloy or aluminum-magnesium alloy and the like. In some embodiments, the lower box 1 may include a frame 12 and a floor 13. The frame 12 and the bottom plate 13 together form a housing space 11. Wherein, the frame 12 and the bottom plate 13 can be integrally or separately molded. Of course, the structure of the lower box 1 is not limited to this, and can be set according to actual needs.

The material of the reinforcing member 2 may be aluminum, aluminum alloy, aluminum magnesium alloy, or the like. As shown in fig. 2, in some embodiments, the reinforcement member 2 may include a first reinforcement beam 21 and a second reinforcement beam 22 disposed in an intersection. The first reinforcing beam 21 may extend in the transverse direction T of the tank assembly P, and the second reinforcing beam 22 may extend in the longitudinal direction L of the tank assembly P. Of course, the structure of the reinforcing member 2 is not limited thereto, and may be designed according to actual needs. In the embodiment shown in fig. 2, the first reinforcing beam 21 and the second reinforcing beam 22 are connected to the frame 12 to divide the receiving space 11 into a plurality of sub-spaces to receive the battery. The first reinforcement beam 21 and the second reinforcement beam 22 may be connected to the frame 12 by welding or the like, for example.

For a battery pack mounted on a vehicle, the case assembly P is mounted on the vehicle body via the mounting assembly 3. A third fastener (not shown) is used to pass through the first sleeve 31 and the second sleeve 32 of the mount assembly 3 and connect with the vehicle body. The third fastener may be a threaded fastener such as a bolt or a bolt-nut arrangement for mounting the battery pack to the vehicle. Referring to the embodiment shown in fig. 2, it is added that, further, mounting points for mounting the case assembly P may be provided on the outer circumference of the lower case 1 (i.e., the frame 12 in fig. 2), and the frame 12 may be connected to the vehicle body through the mounting points using screw connectors, so that the case assembly P is connected to the vehicle body at a plurality of positions, further improving the reliability of the connection of the case assembly P to the vehicle body.

As shown in fig. 2 and 4, in some embodiments, the mount assembly 3 may be provided in plurality. The plurality of mount assemblies 3 may be provided at intervals on the case assembly P, and the provision of the plurality of mount assemblies 3 contributes to reliable connection of the case assembly P with the vehicle body. For example, as shown in fig. 2 and 4, two mount assemblies 3 are arranged on the box assembly P at intervals along the transverse direction T of the box assembly P, wherein one mount assembly 3 passes through the first reinforcing beam 21 to be connected with the reinforcing member 2, and the other mount assembly 3 passes through the connecting position between the first reinforcing beam 21 and the second reinforcing beam 22 to be connected with the reinforcing member 2. Of course, the number of the mounting assemblies 3 and the positions on the box body assembly P are not limited, and can be set arbitrarily according to actual requirements.

The first sleeve 31 of the mounting assembly 3 may be connected to the lower case 1 by welding. Specifically, the first sleeve 31 is welded to the bottom of the lower case 1. Referring to fig. 4 and 9, in some embodiments, the first sleeve 31 may also be fixedly connected to the lower case 1 through an FDS (Flow Drill screen) process. In the FDS process, the screws R are rotated at a high speed under a certain pressure by the FDS device (not shown) to thermally deform the first sleeve 31 and the lower box 1 and sequentially pass through the first sleeve 31 and the lower box 1, and the screws R are tightened by the FDS device according to a certain tightening force to complete the fixed connection between the first sleeve 31 and the lower box 1. Because the bottom of lower box 1 is the sheet metal usually, intensity and rigidity are relatively poor, the third fastener need pass first sleeve 31 and second sleeve 32 and be connected with the vehicle main part, the welding position between first sleeve 31 and lower box 3 is the atress position when the box subassembly P of group battery is connected with the vehicle main part, the welding position is relatively fragile, take place stress concentration easily, consequently, through welding and the double-connection mode that uses the FDS technology come further to strengthen the connection between first sleeve 31 and the lower box 1, thereby can strengthen the joint strength between carry subassembly 3 and the box subassembly P, and then improve the bulk joint strength and the rigidity of box subassembly P.

Referring to the embodiment shown in fig. 2 and 4, the second sleeve 32 and the first sleeve 31 of the mounting assembly 3 can be connected using a threaded connection. For example, the first sleeve 31 has an external thread and the second sleeve 32 has an internal thread to achieve a threaded connection of the first sleeve 31 and the second sleeve 32, although the opposite arrangement is also possible. As shown in fig. 2, 4-8, in some embodiments, the second sleeve 32 includes a first connection 321. The first connecting portion 321 is used for fixedly connecting with the reinforcing member 2.

Specifically, the first connecting portion 321 and the reinforcing member 2 are fixedly connected in a detachable manner, so that stress caused by connection between the first connecting portion 321 and the reinforcing member 2 in a welding manner can be reduced, and the possibility of connection failure is reduced. Referring to fig. 4, in some embodiments, the mounting assembly 3 may include a first fastener 33. The first fastener 33 is used to connect the first connecting portion 321 and the reinforcing member 2. The first fastener 33 may be a threaded fastener such as a bolt, screw, or the like.

In some embodiments, as shown in FIG. 4, the second sleeve 32 is fixedly attached to the upper cover 4. Through the connection established between the upper cover 4 and the second sleeve 32, the connection established between the first sleeve 31 and the reinforcing member 2 through the second sleeve 32 and the connection established between the first sleeve 31 and the lower box body 1, at least three-point connection is formed between the mounting assembly 3 and the box body assembly P, the connection stability between the mounting assembly 3 and the box body assembly P is greatly enhanced, and the connection strength and the rigidity of the box body assembly P are greatly improved on the whole. When the box body component P is installed on a vehicle, the box body component P is guaranteed to be reliably and stably connected with the vehicle body.

To facilitate the fixed connection of the second sleeve 32 with the upper cap 4, the second sleeve 32 may further include a body portion 322 and a second connecting portion 323. The body portion 322 connects the first connection portion 321 and the second connection portion 323 and is located between the reinforcing member 2 and the upper cover 4. The second connecting portion 323 is used to be fixedly connected to the upper cover 4.

Specifically, the second connecting portion 323 is fixedly connected with the upper cover 4 in a detachable manner, so that stress caused by the connection between the second connecting portion 323 and the upper cover 4 in a welding manner is reduced, and the possibility of connection failure is reduced. As with the embodiment shown in fig. 2 and 4, the mounting assembly 3 may also include a second fastener 34. The second fastening member 34 is used to connect the second connecting portion 323 and the upper cover 4. The second fastener 34 may be a threaded fastener, such as a nut, that threadably connects the second fastener 34 with the second coupling portion 323.

Specifically, fig. 4 to 6 show an embodiment of the second sleeve 32, and the first connecting portions 321 are provided in plural (two in the drawing), and the plural first connecting portions 321 extend from the main body portion 322 in the circumferential direction C of the main body portion 322 to connect the second sleeve 32 and the reinforcing member 2. The second connecting portion 323 extends from the body portion 322 and at least partially passes through the upper cover 4 to be connected with the second fastening member 34. The second connecting portion 323 and the main body portion 322 may be hollow cylindrical, an outer diameter d1 of one end of the main body portion 322 close to the second connecting portion 323 is greater than an outer diameter d2 of the second connecting portion 323, so that an L-shaped slot is formed between the main body portion 322 and the second connecting portion 323, the L-shaped slot can limit displacement of the main body portion 322 along movement toward the upper cover 4, the second sleeve 32 is positioned, and the second sleeve 32 is prevented from greatly shifting toward the upper cover 4 when the connection with the upper cover 4 fails in extreme cases.

Referring to the embodiment shown in fig. 4 to 6, the second sleeve 32 and the upper cover 4 may be sealed by the first seal 5. The first seal 5 may be a gasket or the like. The first sealing element 5 is sleeved on the second connecting portion 323 and located between the main body portion 322 and the upper cover 4 to achieve a sealing effect.

Referring to the embodiment shown in fig. 4 to 6, the second sleeve 32 and the reinforcing member 2 are sealed by the second seal 6. The second seal 6 may also be a gasket. The second seal member 6 is located in a space formed by the body portion 322, the first connecting portion 321, and the reinforcing member 2 together. With the structure of the second sleeve 32 shown in fig. 4 to 6, the second sealing member 6 may be sleeved on the main body portion 322, and the second sealing member 6 fills the space formed by the main body portion 322, the first connecting portion 321 and the reinforcing member 2 to seal.

Fig. 7 and 8 show another embodiment of the second sleeve 32, which is a modification of the second sleeve 32 shown in fig. 4 to 6, and the structure of the second sleeve 32 shown in fig. 7 and 8 is similar to that of the second sleeve 32 shown in fig. 4 to 6, and is not described again here. Of course, the configuration and shape of the second sleeve 32 is not limited to the embodiment shown in the figures.

With reference to the embodiment shown in fig. 2 to 4, the assembly process of the mounting assembly 3 with the reinforcing member 2, the lower case 3 and the upper cover 4 is generally as follows: fixedly connecting the second sleeve 32 sleeved with the second sealing element 6 with the reinforcing member 2 through a first fastener 33; a first sleeve 31 provided with an external thread penetrates through the lower box body 1 and the reinforcing member 2 from the bottom of the lower box body 1 to be in threaded connection with a second sleeve 32 provided with an internal thread; welding the first sleeve 31 with the bottom of the lower box body 1, and further fixing the first sleeve with the lower box body 1 by using a screw R through an FDS process; the first sealing member 5 is sleeved on the second sleeve 32, the upper cover 4 is installed on the lower box body 1, the second fastening member 34 is screwed on the second sleeve 32 from the upper part of the upper cover 4 and compresses the first sealing member 5 to achieve the sealing effect, and therefore the mounting assembly 3 is assembled with the reinforcing member 2, the lower box body 3 and the upper cover 4.

The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A case assembly (P) for a battery pack, characterized in that the case assembly (P) comprises:

a lower case (1) having an accommodation space (11);

the reinforcing member (2) is arranged in the accommodating space (11) and is fixedly connected with the lower box body (1);

the mounting assembly (3) is used for mounting the box body assembly (P), the mounting assembly (3) comprises a first sleeve (31) and a second sleeve (32) which are connected with each other, the first sleeve (31) is connected with the lower box body (1) and penetrates through the reinforcing member (2), and the second sleeve (32) is fixedly connected with the reinforcing member (2).

2. A cabinet assembly (P) according to claim 1, wherein the second sleeve (32) comprises a first connection portion (321), the first connection portion (321) being intended to be fixedly connected to the reinforcing member (2).

3. A box assembly (P) according to claim 2, wherein the mounting assembly (3) further comprises a first fastening member (33), the first fastening member (33) being adapted to connect the first connection portion (321) and the reinforcement member (2).

4. A tank assembly (P) according to claim 2, characterized in that it further comprises an upper cover (4), said second sleeve (32) being fixedly connected to said upper cover (4).

5. A cabinet assembly (P) according to claim 4, wherein the second sleeve (32) further comprises a main body portion (322) and a second connecting portion (323), the main body portion (322) connecting the first connecting portion (321) and the second connecting portion (323) and being located between the reinforcing member (2) and the upper cover (4), the second connecting portion (323) being for fixed connection with the upper cover (4).

6. A cabinet assembly (P) according to claim 5, characterized in that said mounting assembly (3) further comprises a second fastening member (34), said second fastening member (34) being adapted to connect said second connecting portion (323) and said upper cover (4).

7. A box assembly (P) according to claim 5, characterized in that it further comprises a first sealing element (5), said first sealing element (5) being housed in said second connection portion (323) and being located between said main body portion (322) and said upper cover (4).

8. A cabinet assembly (P) according to claim 5, further comprising a second seal (6), the second seal (6) being located in a space jointly formed by the main body portion (322), the first connecting portion (321) and the reinforcement member (2).

9. Battery pack, characterized in that it comprises a battery and a case assembly (P) according to any one of claims 1 to 8, said battery being housed in a housing space (11) of the lower case (1).

10. A vehicle, characterized by comprising a vehicle body, a battery pack according to claim 9 and a third fastener for passing through and connecting with the first sleeve (31) and the second sleeve (32) of the mounting assembly (3).