CN218498222U

CN218498222U - Box body assembly and battery pack

Info

Publication number: CN218498222U
Application number: CN202222861802.4U
Authority: CN
Inventors: 赵冬; 郭其鑫; 田瑞生; 尹旭铖
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-02-17
Anticipated expiration: 2032-10-28

Abstract

The utility model relates to a battery technology field specifically is about a box subassembly and battery package, the box subassembly includes: the pipeline connector comprises a box body and a pipeline connector, wherein the box body is provided with a connector mounting part, and a mounting through hole is formed in the connector mounting part; the pipeline joint comprises a joint body and a connecting flange, wherein the connecting flange protrudes out of the surface of the joint body, and at least part of the joint body is positioned in the mounting through hole; wherein, flange orientation the one side of joint installation department has the joining region and dodges the district, the joining region with the joint installation department is connected, dodge the district and locate the joining region is close to connect one side of body, it is provided with dodge the recess to dodge the district. The sealing performance of the battery pack can be improved.

Description

Box body assembly and battery pack

Technical Field

The disclosure relates to the technical field of batteries, in particular to a box assembly and a battery pack.

Background

With the development and progress of the technology, electric vehicles are increasingly widely used, and a battery pack is often provided in the electric vehicles and used for providing power to the electric vehicles. The battery pack can comprise a box body, a battery and a cooling device, wherein the battery and the cooling device are arranged in the box body. The cooling device needs to exchange a cooling medium with external equipment, and a joint is arranged on the box body in order to realize the exchange of the cooling medium between the cooling device and the external equipment. At present, the problem of poor sealing between the joint and the box body is easy to generate.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The utility model aims to provide a box subassembly and battery package, and then promote the sealing performance of box and pipe joint to a certain extent at least.

According to an aspect of the present disclosure, there is provided a case assembly including:

the box body is provided with a joint installation part, and an installation through hole is formed in the joint installation part;

the pipeline joint comprises a joint body and a connecting flange, the connecting flange protrudes out of the surface of the joint body, and at least part of the joint body is positioned in the mounting through hole;

wherein, flange orientation the one side of joint installation department has the joining region and dodges the district, the joining region with the joint installation department connects, dodge the district and locate the joining region is close to one side of joint body, dodge the district and be provided with and dodge the recess.

The box subassembly that the embodiment of the disclosure provided, including box and pipe joint, pipe joint is including connecting body and flange limit, connect the installation through-hole that the body at least part is located the box, the flange limit is provided with the joining region towards the one side of joint installation department, connect through joining region and joint installation department, can promote the leakproofness of pipe joint and box, furthermore, the district of dodging that is close to the joint body in the joining region sets up dodges the recess, can avoid the root on flange limit and the surface of joint installation department to take place to interfere and the poor problem of leakproofness that leads to, further promotion pipe joint and the sealing performance of box.

According to another aspect of the present disclosure, there is provided a battery pack including the case assembly described above.

The battery pack that this disclosed embodiment provided includes the box subassembly, in the box subassembly, the installation through-hole that connects the body at least part to be located on the box, flange limit is provided with the joining region towards the one side of joint installation department, connect through joining region and joint installation department, can promote the leakproofness of pipeline joint and box, furthermore, the recess is dodged in the district setting of dodging that the joining region is close to the joint body, can avoid the root on flange limit and the poor problem of leakproofness that the surface of joint installation department takes place to interfere and leads to, further promotion pipeline connects the sealing performance of and box.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

FIG. 1 is a schematic diagram of a case assembly provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic partially cross-sectional view of a tank assembly provided in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic view, partially in section, of another cassette assembly provided in an exemplary embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a pipe joint according to an exemplary embodiment of the present disclosure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "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 disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An exemplary embodiment of the present disclosure first provides a case assembly, as shown in fig. 1, the case assembly including: the pipeline joint comprises a box body 10 and a pipeline joint 20, wherein the box body 10 is provided with a joint mounting part, and a mounting through hole is formed in the joint mounting part; as shown in fig. 2, 3 and 4, the pipe joint 20 includes a joint body 21 and a connecting flange 22, the connecting flange 22 protrudes from a surface of the joint body 21, and the joint body 21 is at least partially located in the mounting through hole; wherein, the one side of flange 22 towards the joint installation department has connecting region 221 and dodges the district 222, and connecting region 221 and joint installation department are connected, dodges the district 222 and locates the connecting region 221 and be close to the one side of connecting body 21, dodges the district 222 and is provided with dodging recess 201.

The box subassembly that the embodiment of the present disclosure provides, including box 10 and pipe connection 20, pipe connection 20 is including connecting body 21 and flange limit, connect the installation through-hole on body 21 wears to locate box 10, the flange limit is provided with joining region 221 towards the one side of joint installation department, connect the installation department through joining region 221 and joint, can promote the leakproofness of pipe connection 20 and box 10, furthermore, it dodges recess 201 to be close to the district 222 of dodging that connects body 21 at joining region 221, can avoid the root on flange limit and the surface of joint installation department to take place the poor problem of leakproofness that leads to interfere, further promotion pipe connection 20 and the sealing performance of box 10.

The following will describe each part of the box assembly provided by the embodiments of the present disclosure in detail:

the case 10 may include a bottom plate 12 and a frame 11, the bottom plate 12 and the frame 11 are connected, and the bottom plate 12 and the frame 11 enclose an accommodating space for accommodating the battery, the liquid cooling device, the electrical connector, and the like. The box 10 is provided with a connector mounting portion, wherein the connector mounting portion may be provided on the frame 11 or the connector mounting portion may be provided on the bottom plate 12.

For example, the box 10 may be a rectangular parallelepiped or an approximately rectangular parallelepiped structure, the bottom plate 12 may be a rectangular or an approximately rectangular plate structure, and the frame 11 is a rectangular or an approximately rectangular frame 11. For example, the frame 11 may include a first edge beam, a second edge beam, a third edge beam, and a fourth edge beam, and the first edge beam, the second edge beam, the third edge beam, and the fourth edge beam are connected end to end in sequence. The first, second, third and fourth edge beams are respectively connected to one edge of the base plate 12.

In practical applications, the bottom plate 12 may be a solid bottom plate, or the bottom plate 12 may be shared with a liquid cooling plate, that is, the liquid cooling plate is used as the bottom plate 12, and at least one liquid cooling channel is disposed in the liquid cooling plate and used for transmitting a cooling medium.

The fitting mounting portion has at least one flat surface for mounting the pipe fitting 20. When the pipe joint 20 is mounted on the frame 11, the outer side of the frame 11 has a flat surface portion, and the flat surface portion is provided with a mounting through hole penetrating through the frame 11. When the pipe joint 20 is provided on the bottom plate 12, the bottom plate 12 has a flat surface portion provided with a mounting through hole penetrating the bottom plate 12.

The mounting through-hole is provided with a chamfer (chamfer) at an end facing the attachment flange 22, the chamfer being opposite the relief groove. The chamfer may be rounded one turn around the end of the mounting through hole. Interference can be further avoided by providing a chamfer at the end of the mounting through hole facing the attachment flange 22, improving the sealing effect.

Further, the box body 10 provided by the embodiment of the present disclosure may further include a box cover 13, the box cover 13 may be connected to a side of the frame 11 away from the bottom plate 12, and the box cover 13 and the frame 11 are connected in a sealing manner. For example, a gasket may be provided between the bezel 11 and the lid 13. Of course, in practical applications, the box cover 13 may not be disposed in the box 10, for example, the box cover 13 of the box 10 is formed by a chassis of a vehicle, and the embodiment of the disclosure is not limited thereto.

The pipeline joint 20 comprises a joint body 21 and a connecting flange 22, wherein the connecting flange 22 protrudes out of the surface of the joint body 21, and the joint body 21 is arranged in the installation through hole in a penetrating manner; one surface of the connecting flange 22 facing the joint mounting portion is provided with a connecting region 221 and an avoiding region 222, the connecting region 221 is connected with the joint mounting portion, the avoiding region 222 is arranged on one side, close to the joint body 21, of the connecting region 221, and the avoiding region 222 is provided with an avoiding groove 201.

Wherein the connecting flange 22 protrudes from the surface of the joint body 21, and the surface of the connecting flange 22 is disposed perpendicular to the axis of the joint body 21. The connecting flange 22 may partially surround the joint body 21 or the connecting flange 22 may surround the joint body 21 around its circumference.

In the related art, due to reasons such as a machining process, a fillet is arranged at a connecting position of the connecting flange 22 and the joint body 21, and the fillet interferes with the connection between the flange edge and the box body 10, that is, one surface of the flange edge facing the box body 10 cannot be tightly attached to the surface of the joint mounting part due to the existence of the fillet, so that the sealing performance of the pipeline joint 20 and the box body 10 is poor, and liquid leakage and other problems are easily caused. In the embodiment of the present disclosure, the avoidance groove 201 is disposed in the avoidance region 222, so that the fillet at the root of the flange edge is eliminated, the fillet at the root of the flange edge is prevented from interfering with the connection between the flange edge and the frame 11, and the sealing performance of the pipe joint 20 and the box 10 is improved.

A liquid channel is arranged inside the joint body 21, one end of the joint body 21 is connected with an external pipeline, the other end of the joint body 21 is connected with a liquid cooling device, and exchange of cooling media in the external pipeline and the liquid cooling device is achieved through the liquid channel on the joint body 21.

In one embodiment, the pipe joint 20 has a first connection section 211 and a second connection section 212, the first connection section 211 is inserted into the installation through hole, the connection flange 22 is disposed on the first connection section 211, the connection flange 22 is located outside the tank 10, the second connection section 212 is connected to the first connection section 211, the second connection section 212 is located inside the tank 10, and the liquid cooling device is connected to the second connection section 212.

Wherein the cross-sectional area of the first connection section 211 is larger than the cross-sectional area of the second connection section 212. For example, the first connection section 211 and the second connection section 212 have a cylindrical structure, and the diameter of the first connection section 211 is larger than that of the second connection section 212.

A first guiding portion is disposed at an end of the first connection section 211, which is far away from the second connection section 212, and is used for guiding the external pipe when the external pipe is connected to the first connection section 211. And be provided with first spacing groove on first connecting portion, first spacing groove is used for spacing to the outside pipeline to make outside pipeline can with first connecting portion zonulae occludens.

A second guiding portion is disposed at an end of the second connection section 212 far from the first connection section 211, and the second guiding portion is used for guiding the pipeline of the liquid cooling device when the pipeline is connected with the second connection section 212. And a second limiting groove is arranged on the second connecting part and used for limiting the external pipeline so as to enable the external pipeline to be tightly connected with the second connecting part.

The connection flange 22 protrudes from the surface of the joint body 21, and the connection flange 22 is located at the first connection section 211. The connecting flange 22 surrounds the joint body 21, for example, when the joint body 21 is a cylindrical structure, the connecting flange 22 may be a circular ring structure, and when the joint body 21 is a rectangular structure, the connecting flange 22 may be a rectangular ring structure. The side of the connection flange 22 facing the tank 10 is provided with a flat surface which closely conforms to the surface of the tank 10.

The connecting flange 22 has a connecting region 221 and an escape region 222 on a surface facing the housing 10, and the escape region 222 is provided on a side of the connecting region 221 close to the joint body 21. The connection region 221 and the avoidance region 222 may both be annular structures, for example, when the joint body 21 is cylindrical, the connection region 221 and the avoidance region 222 are both annular; or when the joint body 21 is a prism, the connection region 221 and the avoidance region 222 are both polygonal ring-shaped. The relief area 222 is adjacent to the joint body 21, that is, the relief area 222 is in contact with the joint body 21, and there is no space between the relief area 222 and the joint body 21.

An avoidance groove 201 is provided in the avoidance region 222, and the avoidance groove 201 surrounds the joint body 21. The avoiding groove 201 can be fully distributed in the avoiding area 222, that is, the avoiding groove 201 is in contact with the joint body 21, and no gap exists between the avoiding groove 201 and the joint body 21. The cross section of the avoiding groove 201 can be rectangular, or right trapezoid, etc. By arranging the avoidance groove 201 surrounding the joint body 21 in the avoidance area 222, the connection between the pipeline joint 20 and the box body 10 can be prevented from being disturbed by the round angle at the junction of the connecting flange 22 and the joint body 21, and the sealing performance of the pipeline joint 20 and the box body 10 is improved.

Wherein, the width of the avoiding groove 201 is 1mm-5mm. For example, the width of the avoiding groove 201 is 1mm, 1.5mm, 3mm, 4mm, 5mm, etc. The width of the avoidance groove 201 is the minimum distance from the side wall of the avoidance groove 201 close to the joint body 21 to the side wall of the avoidance groove 201 far away from the joint body 21.

The avoiding groove 210 includes a first sidewall and a second sidewall, the first sidewall coincides with the surface of the joint body 21, the second sidewall is located on one side of the first sidewall away from the joint body 21, and the distance between the first sidewall and the second sidewall increases in a first direction, the first direction is a direction perpendicular to the surface of the connecting flange 22 facing the joint installation portion and close to the joint installation portion. That is, the cross-section of the avoidance groove 210 has a right trapezoid shape or a substantially right trapezoid shape. The cross section of the avoiding groove 210 is in a right trapezoid or an approximate right trapezoid structure, so that the pipeline joint is convenient to process, and the production efficiency is improved.

Connection region 221 may be a plane, and the plane in which connection region 221 lies is disposed perpendicular to the axis of fitting body 21. The joint mounting part is a plane, and the plane where the joint mounting part is located is perpendicular to the axis of the mounting through hole. Thus, when the joint body 21 is inserted into the mounting through hole, the connection region 221 is parallel to the joint mounting portion, so that the connection region 221 and the joint mounting portion can be closely attached to each other.

When the pipe joint 20 is mounted on the edge beam, the outer surface of the edge beam has a flat surface which is closely fitted to the coupling region 221 of the coupling flange 22, and the flat surface is welded to the edge of the coupling flange 22. When the pipe joint 20 is mounted on the base plate 12, the bottom surface of the base plate 12 has a flat surface which is closely attached to the coupling region 221 of the coupling flange 22 and is welded to the edge of the coupling flange 22.

In the embodiment of the present disclosure, the connection region 221 of the connection flange 22 and the joint mounting portion are connected by welding. For example, the welding may be performed along the outer circumference of the connection flange 22 so that the connection flange 22 and the case 10 are hermetically coupled. Of course, the connecting flange 22 and the box 10 may be connected in other ways in practical applications, and the disclosed embodiment is not limited thereto.

When the pipe joint 20 and the box 10 are connected by welding, the ambient temperature of the welding portion in the welding process may rise, the rise of the ambient temperature of the welding portion may cause the air in the avoiding groove 201 to be heated, and the air in the avoiding groove 201 may expand after being heated. In order to avoid the sealing failure of the pipe joint 20 and the box body 10 caused by the expansion of air in the avoiding groove 201, the joint mounting part is provided with an exhaust channel 101, and the exhaust channel 101 is communicated with the avoiding groove 201.

Through set up on the joint installation department with dodge the exhaust passage 101 of recess 201 intercommunication for gas in dodging recess 201 can be followed exhaust passage 101 and discharged during the welding, avoided dodging the gas inflation in the recess 201 and the destruction pipe joint 20 that leads to and the sealed of box 10, promoted the sealing performance of pipe joint 20 and box 10.

In one possible embodiment, the vent passage 101 is a gap between the fitting body 21 and the mounting through-hole. For example, the sectional area of the mounting through-hole is larger than that of the joint body 21, so that the exhaust passage 101 is formed between the joint body 21 and the mounting through-hole. The gap may be disposed around the fitting body 21, for example, the gap may be a circular ring structure.

On this basis, in order to facilitate the alignment of the pipe joint 20 and the installation through hole when installing the pipe joint 20, a positioning protrusion may be provided on the inner wall of the installation through hole, for example, a plurality of positioning protrusions distributed along the circumference may be provided on the inner wall of the installation through hole. Three or four evenly distributed positioning bulges can be arranged on the inner wall of the mounting through hole along the circumference.

In another possible embodiment of the present disclosure, the exhaust passage 101 is an exhaust through hole on the joint mounting portion. The exhaust through hole penetrates through the joint mounting part, so that the avoiding groove 201 is communicated with the space inside the box body 10, and air in the avoiding groove 201 enters the box body 10 along the exhaust through hole during welding.

Wherein, one or more exhaust through holes can be arranged on the joint mounting part. When the joint mounting portion is provided with a plurality of exhaust through holes, the plurality of exhaust through holes are arranged in the circumferential direction of the mounting through holes. For example, three exhaust through holes may be provided on the joint mounting portion, and the three exhaust through holes are uniformly distributed along the circumference; or four exhaust through holes are arranged on the joint mounting part and are uniformly distributed along the circumference.

The exhaust through hole can be arranged in the joint mounting part, namely, a space is arranged between the exhaust through hole and the mounting through hole, and the exhaust through hole is not communicated with the mounting through hole. Or the exhaust through hole may also be disposed on a sidewall of the mounting through hole, that is, the exhaust through hole is communicated with the mounting through hole, which is not specifically limited in this embodiment of the disclosure.

The embodiment of the disclosure also provides a battery pack, and the battery pack comprises the box body assembly. Wherein, the box subassembly includes: the pipeline joint comprises a box body 10 and a pipeline joint 20, wherein the box body 10 is provided with a joint mounting part, and a mounting through hole is formed in the joint mounting part; the pipeline joint 20 comprises a joint body 21 and a connecting flange 22, wherein the connecting flange 22 protrudes out of the surface of the joint body 21, and at least part of the joint body 21 is positioned in the mounting through hole; wherein, the one side of flange 22 towards the joint installation department has connecting region 221 and dodges the district 222, and connecting region 221 and joint installation department are connected, dodges the district 222 and locates the connecting region 221 and be close to the one side of connecting body 21, dodges the district 222 and is provided with dodging recess 201.

The battery package that this disclosed embodiment provided includes the box subassembly, in the box subassembly, connect body 21 to wear to locate the installation through-hole on the box 10, the flange limit is provided with joining region 221 towards the one side that connects the installation department, connect the installation department through joining region 221 and joint and connect, can promote the leakproofness of pipe joint 20 and box 10, furthermore, it dodges recess 201 to be close to the district 222 of dodging that connects body 21 at joining region 221 and set up, the root that can avoid the flange limit and the surface that connects the installation department take place to interfere and the poor problem of leakproofness that leads to, further promotion pipe joint 20 and the sealing performance of box 10.

Further, the battery pack provided by the embodiment of the present disclosure may further include a liquid cooling device and a battery, where the liquid cooling device and the battery are disposed in the case 10; the pipe joint 20 has a first connection section 211 and a second connection section 212, the first connection section 211 is inserted into the installation through hole, the connection flange 22 is arranged on the first connection section 211, the connection flange 22 is arranged outside the box body 10, the second connection section 212 is connected with the first connection section 211, the second connection section 212 is arranged in the box body 10, and the liquid cooling device is connected with the second connection section 212.

The battery pack is provided with a plurality of batteries, and the batteries are arranged in the box body 10 according to a preset arrangement mode. For example, a plurality of batteries may form at least one battery pack or battery module, and the battery pack or battery module is disposed in the case 10.

The liquid cooling device is used for cooling the battery, and the liquid cooling device can include cold plate and infusion pipeline, and infusion pipeline and cold plate are connected. The cold plate is provided with a cooling medium channel, one end of the infusion pipeline is connected with the pipeline joint 20, and the other end of the infusion pipeline is connected with the cooling medium channel of the cold plate. The infusion line may be connected directly to the cold plate or the infusion line may be connected to the cold plate via other components, such as a manifold.

The battery is at least partially in contact with the cold plate to effect heat exchange. For example, a cold plate may be provided at the bottom of the cell, or a cold plate may be provided at the top of the cell, or a cold plate may be provided between adjacent cells.

In practical application, the liquid cooling device has a liquid inlet end and a liquid outlet end, and correspondingly, the tank 10 may be provided with a liquid inlet joint and a liquid outlet joint, both of which may be the above-mentioned pipe joint 20. The liquid inlet end and the liquid outlet end of the liquid cooling device can be located on the same side of the liquid cooling device, and at the moment, the liquid inlet joint and the liquid outlet joint can be arranged on one boundary beam of the box body 10 respectively. Or the liquid inlet end and the liquid outlet end in the liquid cooling device can be positioned at two sides of the liquid cooling device, and at the moment, the liquid inlet joint and the liquid outlet joint can be respectively arranged on two opposite boundary beams on the box body 10.

The battery in the embodiment of the present disclosure may be a cylindrical battery or a prismatic battery. When the battery is the cylinder battery, a plurality of cylinder batteries can be array distribution, can include snakelike cold drawing in the liquid cooling device, and snakelike cold drawing is located between two adjacent batteries. When the cells are square cells, the plurality of cells may be stacked, the cold plate may be a planar cold plate disposed at the top or bottom of the battery pack, or the cold plate may be disposed between adjacent cells.

The battery pack that this disclosed embodiment provided includes the box subassembly, in the box subassembly, joint body 21 wears to locate the installation through-hole on the box 10, the flange limit is provided with joining region 221 towards the one side of joint installation department, connect through joining region 221 and joint installation department, can promote the leakproofness of pipe joint 20 and box 10, furthermore, it dodges recess 201 to be close to dodging the district 222 of dodging that connects body 21 at joining region 221, can avoid the root on flange limit and the surface of joint installation department to take place to interfere and the poor problem of leakproofness that leads to, further promotion pipe joint 20 and the sealing performance of box 10.

The battery pack provided by the embodiment of the disclosure can be applied to an electric vehicle, and the battery pack is installed on the electric vehicle and provides energy for the electric vehicle. In practical application, the battery pack can be mounted on a frame of an electric vehicle. The battery pack can be fixedly connected with the frame. Or the battery pack can be a modular battery pack which can be detachably connected to the vehicle body, so that the battery pack is convenient to replace.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A case assembly, the case assembly comprising:

2. The tank assembly as claimed in claim 1, wherein the attachment flange surrounds the fitting body and the relief groove surrounds the fitting body.

3. A housing assembly as defined in claim 1 wherein said attachment flange attachment region and said connector mounting portion are attached by welding.

4. A housing assembly as set forth in claim 3 wherein said connector mounting portion is provided with a vent passage communicating with said relief groove.

5. The tank assembly as claimed in claim 4, wherein the vent passage is a gap between the fitting body and the mounting through-hole.

6. A tank assembly as claimed in claim 5, in which the gap circumferentially surrounds the connector body.

7. The housing assembly of claim 4 wherein said vent passage is a vent through hole in said connector mounting portion.

8. The housing assembly as claimed in claim 7, wherein the joint mounting portion is provided with a plurality of vent through holes arranged in a circumferential direction of the mounting through holes.

9. The cabinet assembly as claimed in claim 1, wherein the cabinet includes:

the boundary beam is provided with the installation through hole, and the pipeline joint is connected with the boundary beam.

10. The tank assembly as claimed in claim 1, wherein the mounting through-hole is provided with a chamfer toward an end of the connection flange, and the relief groove is opposite to the chamfer.

11. A bin assembly as claimed in any one of claims 1 to 10 wherein the relief groove has a width of from 1mm to 5mm.

12. The cabinet assembly as claimed in claim 11, wherein the relief groove includes a first sidewall and a second sidewall, the first sidewall coinciding with a surface of the connector body, the second sidewall being located on a side of the first sidewall remote from the connector body and increasing in distance between the first sidewall and the second sidewall in a first direction perpendicular to a surface of the connecting flange facing the connector mounting portion and closer to the connector mounting portion.

13. A battery pack, characterized in that the battery pack comprises a case assembly according to any one of claims 1 to 12.

14. The battery pack of claim 13, wherein the battery pack further comprises:

the liquid cooling device is arranged in the box body;

the pipe joint is provided with a first connecting section and a second connecting section, the first connecting section penetrates through the installation through hole, the connecting flange is arranged on the first connecting section, the connecting flange is located outside the box body, the second connecting section is connected with the first connecting section, the second connecting section is located in the box body, and the liquid cooling device is connected with the second connecting section.