CN212434759U

CN212434759U - Electric vehicle, battery pack, shell structure, lower shell and sealing structure

Info

Publication number: CN212434759U
Application number: CN202020859662.5U
Authority: CN
Inventors: 徐义; 牛魁; 许炳; 王振宇; 何凯欣; 许俊海; 席忠民
Original assignee: GAC Aion New Energy Automobile Co Ltd
Current assignee: GAC Aion New Energy Automobile Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-01-29
Anticipated expiration: 2030-05-20

Abstract

The utility model relates to an electric motor car, battery package, shell structure, lower casing and seal structure, the seal structure of lower casing includes bottom plate and frame. The bottom plate comprises a first body and a second body, and the first body and the second body are arranged oppositely at intervals; the frame comprises a third body and a fourth body, the third body is connected with the first body, the fourth body is connected with the second body, and the first body, the third body, the fourth body and the second body can be enclosed to form a sealed cavity. First body and third body coupling and cooperation form the inlayer protective layer, and the second body forms outer protective layer with fourth body coupling and cooperation to can carry out double-deck sealed protection to the battery module, even take place to collide with the end and lead to that outer protective layer is impaired and even take place to break, utilize the inlayer protective layer also to realize sealed protection to the battery module, avoid appearing battery module short circuit scheduling problem, be favorable to driving safety.

Description

Electric vehicle, battery pack, shell structure, lower shell and sealing structure

Technical Field

The utility model relates to a battery package technical field especially relates to an electric motor car, battery package, shell structure, lower casing and seal structure.

Background

With increasing attention to the environment, electric vehicles using electric energy as a driving energy are also increasingly popular. In order to ensure that the electric vehicle can continuously and reliably run, the battery module in the battery pack is required to be ensured not to be interfered by external foreign matters, for example, the sealing performance of the battery pack needs to reach a corresponding sealing grade, so that the battery module in the battery pack is ensured not to be short-circuited due to water inflow and the like. Simultaneously, because the battery package is installed in the below position on chassis usually, face the risk of knocking with the end, lead to casing impaired and even take place to break down easily to make the sealed easy inefficacy of battery package, and then arouse battery module short circuit scheduling problem, be unfavorable for driving safety.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an electric vehicle, a battery pack, a housing structure, a lower housing, and a sealing structure for solving the problems that the sealing of the battery pack is prone to failure and is not beneficial to driving safety.

In one aspect, a sealing structure is provided, including:

the bottom plate comprises a first body and a second body, and the first body and the second body are arranged oppositely at intervals; and

the frame comprises a third body and a fourth body, the third body is connected with the first body, the fourth body is connected with the second body, and the first body, the third body, the fourth body and the second body can be enclosed to form a sealed cavity.

In one embodiment, the first body and the second body are oppositely arranged at an interval and are matched to form an installation cavity, the frame further comprises a connecting body, the connecting body is connected with one end of the third body and one end of the fourth body, and the connecting body can be inserted into the installation cavity and connected with the inner wall of the installation cavity.

In one embodiment, the base plate further includes a reinforcing member disposed between the first body and the second body, and the reinforcing member is connected to both the first body and the second body, and the base plate is further provided with a mounting hole extending from the first body to the reinforcing member, and the mounting hole is used for mounting a battery module.

In one embodiment, the upper surface of the first body is provided with a first mounting part for mounting a wire harness; and/or the upper surface of the first body is provided with a supporting part for supporting the water pipe.

In one embodiment, the sealing structure further comprises a second mounting part for mounting a battery management system, the first body is provided with a first through hole, and the second mounting part penetrates through the first through hole and is in sealing fit with the inner wall of the first through hole.

In one embodiment, the sealing structure further comprises a mounting sleeve for mounting the cooling pipe, the third body is provided with a second through hole, the fourth body is provided with a third through hole, and the third through hole is corresponding to the second through hole and is communicated with the sealing cavity to form a mounting channel for mounting the mounting sleeve.

The seal structure of above-mentioned embodiment, through being connected first body and third body, be connected the second body with the fourth body, make first body, the third body, fourth body and second body enclose and establish into confined sealed chamber, thereby make first body and third body cooperation form the inlayer protective layer that can seal the protection to the battery module, make second body and fourth body cooperation form the outer protective layer that can seal the protection to the battery module, thereby can carry out double-deck sealed protection to the battery module, even take place to collide with the end and lead to the outer protective layer impaired and even take place to break, utilize the inlayer protective layer also to realize sealed protection to the battery module, avoid appearing battery module short circuit scheduling problem, be favorable to driving safety.

In another aspect, a lower housing is provided, which comprises the sealing structure.

The lower casing of above-mentioned embodiment, first body and third body coupling and cooperation form the inlayer protective layer that can seal the protection to the battery module, second body and fourth body coupling and cooperation form the outer protective layer that can seal the protection to the battery module, thereby can carry out double-deck sealed protection to the battery module, even take place to collide with the end and lead to the outer protective layer impaired and even take place to break, utilize the inlayer protective layer also can realize sealed protection to the battery module, avoid appearing battery module short circuit scheduling problem, be favorable to driving safety.

In another aspect, a housing structure is provided, which includes an upper housing and a lower housing, the upper housing is connected to the frame, and the upper housing, the bottom plate and the frame can cooperate to form a receiving cavity.

In the case structure of the embodiment, the first body and the third body are connected and matched to form the inner protection layer capable of sealing and protecting the battery module; connecting the second body and the fourth body and matching to form an outer protection layer capable of sealing and protecting the battery module; fixedly arranging the battery module on the first body in a riveting, screwing and other modes; and then the upper shell and the frame are connected by adopting screw connection, riveting and other modes, so that the battery module is packaged in the accommodating cavity, and then double-layer sealing protection can be carried out on the battery module, even if the battery module is damaged or even broken due to the fact that the outer protective layer is damaged due to knocking, the inner protective layer can be used for realizing sealing protection on the battery module, the problem that the battery module is short-circuited and the like due to the fact that external rainwater and other foreign matters enter the accommodating cavity is avoided, and the driving safety is facilitated.

In another aspect, a battery pack is provided, which includes a battery module and the housing structure, wherein the battery module is fixedly disposed in the accommodating cavity.

The battery package of above-mentioned embodiment, the battery module adopts the riveting, modes such as spiro union set firmly behind the holding intracavity, because first body and third body coupling and cooperation form the inlayer protective layer that can seal protection to the battery module, the second body forms the outer protective layer that can seal protection to the battery module with fourth body coupling and cooperation, thereby can carry out double-deck sealing protection to the battery module, even take place to lead to the outer protective layer impaired and even take place to break at the end of colliding with, utilize the inlayer protective layer also can realize sealing protection to the battery module, avoid foreign matters such as external rainwater to get into and hold the intracavity and battery module short circuit scheduling problem appears, the security performance of battery package is high, be favorable to driving safety.

In a further aspect, an electric vehicle is provided, which comprises the battery pack.

The electric motor car of above-mentioned embodiment, the shell structure of battery package is sealed effectual to the battery module, even take place to collide with the end and lead to the outer protective layer impaired and even take place to break, utilizes the inlayer protective layer also to realize sealed protection to the battery module, avoids foreign matters such as external rainwater to get into and holds the intracavity and battery module short circuit scheduling problem appears, is favorable to driving safety.

Drawings

FIG. 1 is a schematic structural diagram of a housing structure of an embodiment;

FIG. 2 is a schematic view of the lower housing of the housing structure of FIG. 1;

FIG. 3 is a partial cross-sectional view A-A of the lower shell of the shell structure of FIG. 2;

FIG. 4 is a partial cross-sectional view B-B of the lower shell of the shell structure of FIG. 2;

FIG. 5 is a partial cross-sectional view C-C of the lower shell of the shell structure of FIG. 2;

FIG. 6 is a partial cross-sectional view of D-D of the lower shell of the shell structure of FIG. 2;

fig. 7 is a partial cross-sectional view of E-E of the lower shell of the shell structure of fig. 2.

Description of reference numerals:

10. the lower shell body, 110, a bottom plate, 111, a first body, 112, a second body, 113, a mounting cavity, 114, a reinforcement, 115, a mounting hole, 120, a frame, 121, a third body, 122, a fourth body, 123, a mounting channel, 124, a rivet nut, 130, a connecting body, 140, a connecting piece, 150, a first mounting part, 160, a second mounting part, 161, a mounting cylinder, 170, a supporting part, 171, a supporting frame, 180, a mounting sleeve, 20, an upper shell body, 30 and a cooling pipe.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As shown in fig. 1-3, in one embodiment, a sealing structure is provided, which includes a bottom plate 110 and a frame (not labeled). The bottom plate 110 includes a first body 111 and a second body 112, and the first body 111 and the second body 112 are disposed at an interval; the frame 120 includes a third body 121 and a fourth body 122, the third body 121 is connected to the first body 111, the fourth body 122 is connected to the second body 112, and the first body 111, the third body 121, the fourth body 122 and the second body 112 can be enclosed to form a sealed cavity (not labeled).

The sealing structure of the above embodiment, through being connected first body 111 and third body 121, be connected second body 112 and fourth body 122, make first body 111, third body 121, fourth body 122 and second body 112 enclose and establish into confined sealed chamber, thereby make first body 111 and third body 121 cooperation form the inner layer protective layer that can seal the protection to the battery module, make second body 112 and fourth body 122 cooperation form the outer protective layer that can seal the protection to the battery module, thereby can carry out double-deck sealed protection to the battery module, even take place to collide with the end and lead to the outer protective layer impaired and even take place to break, utilize the inner layer protective layer also can realize sealed protection to the battery module, avoid appearing battery module short circuit scheduling problem, be favorable to driving safety.

It should be noted that, in order to ensure the sealing performance, the first body 111 and the third body 121 may be hermetically connected by welding (for example, friction stir welding), riveting, or the like, and the sealing grade of the inner layer protection layer formed by the first body 111 and the third body 121 in cooperation is preferably better than IP 67; similarly, the second body 112 and the fourth body 122 may be connected in a sealing manner by welding (for example, friction stir welding), riveting, or the like, and the sealing grade of the outer protection layer formed by the second body 112 and the fourth body 122 in cooperation is preferably better than that of IP 67; therefore, the sealing performance of the sealing cavity is good, the sealing grade of the whole lower shell 10 is excellent, and the battery module can be effectively protected in a sealing mode.

In addition, for convenience of transportation, the frame 120 may be split into multiple sections (for example, the frame 120 may be split into side beams, cross beams, and oblique beams connecting the side beams and the cross beams), and each section is spliced to obtain the frame 120; meanwhile, in order to ensure the reliability of connection, welding can be carried out after splicing. The bottom plate 110 assembly can also be obtained by connecting a plurality of bottom plates 110 in a tailor-welded manner, and then the bottom plate 110 assembly is assembled and connected with the frame 120. The bottom plate 110 and the frame 120 may be made of aluminum alloy and may be manufactured by an extrusion process.

As shown in fig. 3 to 5, of course, a corresponding connection member 140 may be further disposed between the first body 111 and the second body 112, and the first body 111 and the second body 112 may be connected by the connection member 140, so as to enhance the strength and rigidity of the bottom plate 110, so that the bottom plate 110 may not be easily deformed. Similarly, a corresponding connecting member 140 may be disposed between the third body 121 and the fourth body 122, and the third body 121 and the fourth body 122 may be connected by the connecting member 140, so as to enhance the strength and rigidity of the frame 120 and ensure that the frame 120 is not easily deformed. Wherein the connecting member 140 may be a connecting rib.

As shown in fig. 3 to 7, in one embodiment, the first body 111 and the second body 112 are spaced apart from each other and cooperate to form a mounting cavity 113. As shown in fig. 3, the frame 120 further includes a connecting body 130, and the connecting body 130 is connected to one end of the third body 121 and one end of the fourth body 122. The connection body 130 can be inserted into the mounting cavity 113 and connected to the inner wall of the mounting cavity 113. So, insert the connecting body 130 in the installation cavity 113, adopt modes such as welding or riveting again and all be connected connecting body 130 and first body 111 and second body 112 to make first body 111 and third body 121 cooperate and form the inlayer protective layer that can seal the protection to the battery module, make second body 112 and fourth body 122 cooperate and form the outer protective layer that can seal the protection to the battery module. Meanwhile, the connecting body 130 is inserted into the mounting cavity 113, so that the contact area between the connecting body and the first body 111 and the contact area between the connecting body and the second body 112 can be increased, the sealing effect between the first body 111 and the third body 121 is better, the sealing effect between the second body 112 and the fourth body 122 is better, and the sealing performance of the sealing cavity can be better ensured. Moreover, the connecting body 130 is inserted into the mounting cavity 113, and then the first body 111 and the third body 121 are directly connected in a sealing manner and the second body 112 and the fourth body 122 are connected in a sealing manner by means of friction stir welding, and the like, so that the connecting body 130 can also play a certain supporting role in the welding process, the welding can be smoothly performed, and the welding effect is good. The connecting body 130 may be a connecting rib or a connecting protrusion, and the connecting body 130 may further have a cavity to reduce the mass of the lower housing 10.

As shown in fig. 4, on the basis of any of the above embodiments, the base plate 110 further includes a reinforcing member 114, the reinforcing member 114 is disposed between the first body 111 and the second body 112, and the reinforcing member 114 is connected to both the first body 111 and the second body 112, the base plate 110 is further provided with a mounting hole 115 extending from the first body 111 to the reinforcing member 114, and the mounting hole 115 is used for mounting the battery module. Therefore, the installation and fixing position of the battery module on the bottom plate 110 corresponds to the position of the reinforcing member 114, so that the installation between the battery module and the bottom plate 110 is more reliable and stable, and the battery module is ensured not to be easily loosened. Meanwhile, the battery module is fixedly mounted through the mounting hole 115 extending from the first body 111 to the reinforcing member 114 without damaging the sealing effect of the sealing cavity. The mounting holes 115 are preferably threaded holes, and are engaged with the threads of the threaded holes by using a connecting member such as a bolt or a screw, so that the battery module can be easily, conveniently, stably and reliably fixed to the base plate 110. The reinforcing member 114 may be provided in the shape of a strip, a block, or the like, and is preferably a solid reinforcing rib structure; the reinforcing part 114 can be integrally formed with the first body 111 and the second body 112, and can be separately produced and then assembled and connected with the first body 111 and the second body 112 in a welding or screwing mode and the like, and only the requirement that the reinforcing part 114 can be stably and reliably fixed in the mounting cavity 113 is met.

As shown in fig. 5, in any of the above embodiments, the first body 111 is provided at its upper surface with a first mounting portion 150 for mounting a wire harness (not shown). In this way, the first mounting portion 150 is used to fix the harness, so that the harness is prevented from moving in the lower housing 10, the wiring manner of the harness is simplified, and the wiring space is saved. The first mounting portion 150 may be a mounting clip, a mounting buckle, or the like that can mount and fix the wire harness. The first mounting portion 150 may be fixedly disposed on the upper surface of the first body 111 by welding or riveting. The upper surface of the first body 111 refers to a surface away from the second body 112.

As shown in fig. 6, in any of the above embodiments, a support portion 170 for supporting a water pipe (not shown) is provided on the upper surface of the first body 111. Thus, the water pipe in the lower housing 10 is supported and fixed by the support part 170, so that the water pipe is prevented from moving in the lower housing 10, the arrangement path of the water pipe can be simplified, and the space can be saved. The support part 170 may be a structure such as a support frame 171 that can support and fix the water pipe; for example, the support bracket 171 is welded to the upper surface of the first body 111, and the support bracket 171 is provided with a blind rivet nut, so that the water pipe can be supported and fixed.

Of course, the first mounting part 150 and the supporting part 170 may be simultaneously provided on the upper surface of the first body 111, and the first mounting part 150 is spaced apart from the supporting part 170. So, can install fixedly respectively installation pencil and water pipe.

As shown in fig. 5, in addition to any of the above embodiments, the sealing structure further includes a second mounting portion 160 for mounting a battery management system (not shown), the first body 111 is provided with a first through hole (not labeled), and the second mounting portion 160 penetrates through the first through hole and is in sealing fit with the inner wall of the first through hole. In this way, the battery management system is mounted and fixed by the second mounting portion 160; meanwhile, the sealing effect of the sealing cavity cannot be damaged by installing the battery management system, and the double-layer sealing effect is ensured. The second mounting portion 160 may be configured as a mounting post, a mounting body, etc., and the outer contour of the mounting post or the mounting body matches the through hole; for example, when the second mounting portion 160 is configured as the mounting cylinder 161, the first through hole is a circular through hole, the mounting cylinder 161 passes through the circular through hole and enters the sealing cavity, and then the outer side wall of the mounting cylinder 161 is welded to the inner side wall of the circular through hole (a circle of full welds surrounds the circumference of the mounting cylinder 161), so that the mounting cylinder 161 can be fixed, and a mounting blind hole for fixing the battery management system can be configured on the mounting cylinder 161; meanwhile, in order to ensure the sealing effect of the sealing cavity, a flange may be disposed at one end of the mounting cylinder 161, so that the side surface of the flange is attached to the upper surface of the first body 111, and the flange is welded to the first body 111, so that the sealing effect of the sealing cavity is better.

As shown in fig. 7, on the basis of any of the above embodiments, the sealing structure further includes a mounting sleeve 180 for mounting the cooling pipe 30, the third body 121 is provided with a second through hole, the fourth body 122 is provided with a third through hole, and the third through hole is arranged corresponding to the second through hole and is communicated with the sealing cavity to form a mounting channel 123 for mounting the mounting sleeve 180. So, install installation cover 180 in installation passageway 123 for the outer wall of installation cover 180 and the inner wall sealing connection of installation passageway 123 pass installation cover 180 with cooling tube 30 again, make the outer wall of cooling tube 30 and the inner wall sealing connection of the through-hole of installation cover 180, thereby realize that the installation of cooling tube 30 is fixed, also can make the inside external relatively of casing 10 down keep sealed, guarantee that battery module can be stable, reliable work.

In one embodiment, there is also provided a lower housing 10 including the sealing structure of any of the above embodiments.

The lower casing 10 of above-mentioned embodiment, first body 111 is connected and the cooperation forms the inlayer protective layer that can seal the protection to the battery module with third body 121, second body 112 is connected and the cooperation forms the outer protective layer that can seal the protection to the battery module with fourth body 122, thereby can carry out double-deck sealed protection to the battery module, even take place to collide with the end and lead to the outer protective layer impaired or even take place to break, utilize the inlayer protective layer also can realize sealed protection to the battery module, avoid appearing battery module short circuit scheduling problem, be favorable to driving safety.

As shown in fig. 1 to fig. 3, in an embodiment, a housing structure is further provided, which includes an upper housing 20 and the lower housing 10 of the above embodiment, the upper housing 20 is connected to the frame 120, and the upper housing 20, the bottom plate 110 and the frame 120 can cooperate to form a receiving cavity (not labeled).

In the case structure of the embodiment, the first body 111 and the third body 121 are connected and matched to form an inner protection layer capable of sealing and protecting the battery module; the second body 112 and the fourth body 122 are connected and matched to form an outer protection layer capable of sealing and protecting the battery module; fixing the battery module on the first body 111 by riveting, screwing and other methods; and then, the upper shell 20 and the frame 120 are connected by means of screw connection, riveting and the like, so that the battery module is packaged in the accommodating cavity, double-layer sealing protection can be performed on the battery module, even if the battery module is damaged or even broken due to the fact that the outer protective layer is knocked at the bottom, the battery module can be protected in a sealing manner by the aid of the inner protective layer, the problem that the battery module is short-circuited due to the fact that external rainwater and other foreign matters enter the accommodating cavity is avoided, and driving safety is facilitated.

As shown in fig. 3, the upper housing 20 and the frame 120 can be connected by providing corresponding blind connecting holes on the third body 121 and then connecting the upper housing 20 and the third body 121 by using the rivet nut 124, so as to realize the assembly connection between the upper housing 20 and the lower housing 10; further, in order to ensure the sealing performance of the sealing cavity, a sealant can be coated or a sealing ring is additionally arranged between the side surface of the flange of the blind rivet nut 124 and the upper side surface of the third body 121 for sealing and matching, so that the sealing performance of the sealing cavity is ensured. The upper side of the third body 121 refers to a side away from the fourth body 122.

In an embodiment, a battery pack is further provided, which includes a battery module (not shown) and the housing structure of the above embodiment, wherein the battery module is fixedly disposed in the accommodating cavity.

The battery package of above-mentioned embodiment, the battery module adopts the riveting, modes such as spiro union set firmly behind the holding intracavity, because first body 111 is connected and cooperates the inner protective layer that forms and to carry out sealed protection to the battery module with third body 121, second body 112 is connected and cooperates the outer protective layer that forms and to carry out sealed protection to the battery module with fourth body 122, thereby can carry out double-deck sealed protection to the battery module, even take place to collide with the end and lead to outer protective layer impaired and even take place to break, utilize inner protective layer also to realize sealed protection to the battery module, avoid foreign matter such as external rainwater to get into and hold the intracavity and battery module short circuit scheduling problem appears, the security performance of battery package is high, be favorable to driving safety.

In one embodiment, an electric vehicle is also provided, which comprises the battery pack of the above embodiment.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

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

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

It should also be understood that in explaining the connection relationship or the positional relationship of the elements, although not explicitly described, the connection relationship and the positional relationship are interpreted to include an error range which should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A sealing structure, comprising:

2. The sealing structure of claim 1, wherein the first body and the second body are spaced apart from each other and cooperate to form a mounting cavity, and the frame further includes a connecting body, the connecting body is connected to both one end of the third body and one end of the fourth body, and the connecting body can be inserted into the mounting cavity and connected to an inner wall of the mounting cavity.

3. The seal structure of claim 1, wherein the base plate further comprises a stiffener disposed between the first body and the second body and connected to both the first body and the second body, the base plate further having mounting holes extending from the first body to the stiffener, the mounting holes for battery module mounting.

4. The seal structure according to claim 1, characterized in that an upper surface of the first body is provided with a first mounting portion for mounting a wire harness; and/or the upper surface of the first body is provided with a supporting part for supporting the water pipe.

5. The seal structure of claim 1, further comprising a second mounting portion for mounting a battery management system, the first body being provided with a first through hole, the second mounting portion passing through the first through hole and being in sealing engagement with an inner wall of the first through hole.

6. The seal structure according to any one of claims 1 to 5, further comprising a mounting sleeve for mounting the cooling pipe, wherein the third body is provided with a second through hole, and the fourth body is provided with a third through hole which is arranged corresponding to the second through hole and communicated with the seal cavity to form a mounting passage for mounting the mounting sleeve.

7. A lower housing characterized by comprising the seal structure according to any one of claims 1 to 6.

8. A shell structure, characterized by comprising an upper shell and the lower shell as claimed in claim 7, wherein the upper shell is connected with the frame, and the upper shell, the bottom plate and the frame can cooperate to form a containing cavity.

9. A battery pack, comprising a battery module and the housing structure of claim 8, wherein the battery module is fixedly disposed in the accommodating cavity.

10. An electric vehicle comprising the battery pack according to claim 9.