Battery box body structure

Abstract

The utility model relates to the field of battery box body equipment, and discloses a battery box body structure which comprises a bottom protective plate, a frame structure and a water cooling plate, and the frame structure is provided with an auxiliary connecting structure which is convenient for external auxiliary equipment to operate and use relative to the frame structure. Connecting parts are formed in the positions, corresponding to the auxiliary connecting structures, of the bottom protection plate and the water cooling plate, and the connecting parts are connected to the auxiliary connecting structures. The auxiliary connecting structure is arranged on the frame structure, so that the bottom protective plate, the frame structure and the water cooling plate can be connected together when being assembled and connected, separate connection is not needed, and production procedures are reduced; the auxiliary connecting structure can avoid the auxiliary equipment when the auxiliary equipment is used for connecting and assembling, so that the auxiliary equipment can normally and completely connect the bottom protective plate, the frame structure and the water cooling plate, and the operation is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery box equipment field, especially a battery box structure. BACKGROUND

[0002] Battery box, also known as battery box, power supply cabin, battery tray or battery pack lower shell, is the protective shell of the battery system, has fixed, heat dissipation, insulation and protection functions, and is widely used in various fields, such as new energy vehicles, power and communication, portable electronic equipment and the like.

[0003] The battery box is usually composed of a bottom guard plate, a frame surrounding the bottom guard plate, and a water cooling plate arranged in the bottom guard plate and the frame. The bottom guard plate and the frame are used in cooperation to fix various components of the battery system, effectively prevent the bottom of the battery from being affected by external impact and vibration, and insulate, waterproof and fireproof to protect the safety of the battery system. As a key heat dissipation component in the battery box, the water cooling plate realizes battery thermal management through water circulation, and effectively uniformly dissipates heat of the battery system by using flowing cooling water, so as to form a stable overall structure together with the bottom guard plate and the frame.

[0004] In the prior art, the water cooling plate and the frame are connected together by using FDS nails (flow drill screws) during assembly and connection, and then the bottom guard plate is connected to the frame by using bolts or rivet nuts to realize connection. This connection method is not only complicated, but also requires the use of auxiliary equipment to install the bolts or rivet nuts on the bottom guard plate and the frame for the connection between the bottom guard plate and the frame. Since the frame is basically in a sealed state after being formed, the use of auxiliary equipment for installing the water cooling plate and the bottom guard plate on the frame will be interfered by the frame, thereby affecting the use of the auxiliary equipment. SUMMARY

[0005] In view of the above problems of the prior art, the utility model provides a battery box structure to form a battery box structure convenient to install and connect.

[0006] To solve the above technical problems, one technical scheme of the utility model is to provide a battery box structure including a bottom guard plate, a frame structure, and a water cooling plate. The frame structure is provided with an auxiliary connection structure for facilitating the operation and use of external auxiliary equipment. The bottom guard plate and the water cooling plate are both provided with a connection part corresponding to the position of the auxiliary connection structure, and each connection part is connected to the auxiliary connection structure.

[0007] Further, the auxiliary connection structure is provided with a plurality of avoiding parts for avoiding external auxiliary equipment, and each connection part is connected to the auxiliary connection structure in a stack manner corresponding to the avoiding parts.

[0008] Further, an accommodating space is formed in the inside of the frame structure along the thickness direction, the auxiliary connecting structure is arranged around the inner wall of the accommodating space, and the avoiding part is arranged towards the accommodating space.

[0009] Further, the auxiliary connecting structure comprises a connecting frame distributed on one side of the frame structure along the thickness direction and extending towards the inside, the connecting frame is hollow inside and has a connecting surface connected to the connecting part for connecting with the connecting part and an inclined surface connected to the frame structure and the connecting surface respectively, the inclined surface is inclined to the frame structure and forms an installation space with the connecting surface and the connecting surface, the installation space is distributed at an acute angle towards the outside of the frame structure, and the avoiding part is formed on the inclined surface.

[0010] Further, the avoiding part comprises an avoiding hole opened on the inclined surface along the thickness direction, and the avoiding holes of the avoiding parts are distributed equidistantly around the inner wall of the accommodating space.

[0011] Further, the connecting surface is recessed with a support groove opposite to the installation space on the side away from the inclined surface along the thickness direction, the support groove is penetrated towards the inside, and the connecting parts of the water-cooled plate and the bottom guard plate are stacked along the thickness direction.

[0012] Further, the connecting parts are riveted together.

[0013] Further, the frame structure comprises a main frame body in a square shape and surrounding the accommodating space, and a plurality of secondary frame bodies arranged in parallel in the accommodating space, two ends of the secondary frame body are welded to the opposite two sides of the main frame body respectively, the auxiliary connecting structure is integrally connected to the main frame body, and the secondary frame body has a fitting side edge fitted to the inclined surface and the water-cooled plate when the water-cooled plate and the bottom guard plate are connected to the auxiliary connecting structure.

[0014] Further, the frame structure further comprises a support frame body integrally connected to the main frame body and extending and distributed towards the inside around the accommodating space, the connecting surface and the inclined surface are connected to an inner side surface of the support frame body towards the inside respectively, and the installation space is surrounded between the inclined surface, the connecting surface and the inner side surface; the secondary frame body comprises a partition part connected to the main frame body at both ends and a fitting part connected to the partition part towards the water-cooled plate, the partition part is supported on the support frame body, and the fitting part is formed with the fitting side edge matched to the water-cooled plate and the inclined surface.

[0015] Further, the water-cooled plate and the bottom guard plate are arranged along the thickness direction, the water-cooled plate is located on the side towards the accommodating space, the bottom guard plate is located on the side away from the accommodating space, and a buffer space is formed between the water-cooled plate and the bottom guard plate, and the connecting parts of the water-cooled plate and the bottom guard plate are formed on the side edges thereof respectively and are sealingly connected to the connecting surface.

[0016] The battery box structure has at least the following beneficial effects: the auxiliary connecting structure is arranged on the frame structure, so that the bottom guard plate, the frame structure and the water cooling plate can be connected together when being assembled, separate connection is not needed, production procedures are reduced, and the auxiliary connecting structure can avoid the auxiliary equipment when the auxiliary equipment is used for connection and assembly, so that the auxiliary equipment is convenient for normally and completely connecting the bottom guard plate, the frame structure and the water cooling plate, and operation is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0018] Figure 1 It is a structural schematic view of the battery box structure of the utility model;

[0019] Figure 2 It is a side sectional view of the battery box structure of the utility model;

[0020] Figure 3 It is Figure 2 It is an enlarged schematic view of part A shown in the figure;

[0021] Figure 4 It is a structural schematic view of the main frame body of the hidden part of the battery box structure of the utility model;

[0022] Figure 5 It is Figure 4 It is an enlarged schematic view of part B shown in the figure;

[0023] Figure 6 It is Figure 4 It is an enlarged schematic view of part C shown in the figure.

[0024] The meanings of various reference numerals in the drawings are as follows:

[0025] Frame structure 1, main frame body 11, first side 111, second side 112, connecting frame body 113, connecting hole 114, avoiding through slot 115, secondary frame body 12, partition plate part 121, adhering part 122, adhering side edge 1221, notch 123, support frame body 13, inner side surface 131, containing space 14, auxiliary connecting structure 2, connecting frame 21, connecting surface 211, inclined surface 212, mounting space 213, support groove 214, avoiding part 22, bottom guard plate 3, buffer space 31, water cooling plate 4, connecting part 5. DETAILED DESCRIPTION

[0026] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in conjunction with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0027] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0029] The present application will be further described below in conjunction with the drawings.

[0030] Please refer to Figures 1 to 6 The battery box structure of the present application comprises a frame structure 1, an auxiliary connecting structure 2, a bottom guard plate 3 and a water cooling plate 4. The frame structure 1 is used to support and protect the battery system. The auxiliary connecting structure 2 is connected to the frame structure 1. The bottom guard plate 3 and the water cooling plate 4 are connected to the frame through the auxiliary connecting structure 2, forming the battery box structure. The auxiliary connecting structure 2 is used to facilitate the use of auxiliary equipment when the bottom guard plate 3 and the water cooling plate 4 are installed. The bottom plate is used to protect the battery system after being installed in the frame structure 1. The water cooling plate 4 is used for heat dissipation and cooling to prevent overheating damage and improve the service life of the battery box structure and the service life of the battery system.

[0031] In the present embodiment, the frame structure 1 comprises a main frame body 11 in the shape of a square and surrounding a containing space 14, a plurality of secondary frame bodies 12 arranged in parallel in the containing space 14, and a support frame body 13 integrally connected to the main frame body 11 and extending inwardly around the containing space 14. The main frame body 11 forms the main frame of the battery box structure. The secondary frame bodies 12 are arranged from the inside of the containing space 14 to reinforce the structural strength of the main frame body 11. The support frame body 13 is formed in the containing space 14. The auxiliary connecting structure 2 is formed in the support frame body 13, so that the auxiliary connecting structure 2 is spaced from the main frame body 11 to some extent, thereby increasing the space for operating the auxiliary equipment when the auxiliary equipment is used, and facilitating the processing of the auxiliary connecting structure 2.

[0032] In the content defined by the embodiment, the main frame body 11 is a rectangular frame structure formed by welding four metal honeycomb plates end to end, and the battery box structure is taken as a reference to divide it into a thickness direction, a length direction and a width direction. The thickness direction, the length direction and the width direction all refer to the direction of the thickness, the length and the width of the battery box structure. The width direction of the four honeycomb plates is distributed along the thickness direction and has equal width. Two of the metal honeycomb plates have the same length, and the other two metal honeycomb plates have the same length and are longer or shorter than the other two metal honeycomb plates, thereby forming a rectangular frame structure. The accommodating space 14 is a cuboid and penetrates along the thickness direction. The two sides of the main frame body 11 along the thickness direction are defined as the first side 111 and the second side 112, respectively. On the four sides of the first side 111 of the main frame body 11, the connecting frame body 113 is formed on the side away from the main frame body 11. The connecting frame body 113 is also a metal honeycomb plate and is fixedly connected or integrally formed on the main frame body 11. The connecting frame body 113 can be fixedly connected to the main frame body 11 by welding, and the connecting frame body 113 is flush with the first side 111 of the main frame body 11. A plurality of connecting holes 114 are formed on each connecting frame body 113 along the length direction of the connecting frame body 113. The connecting holes 114 penetrate the connecting frame body 113 along the thickness direction and are distributed at equal intervals, so as to connect the main frame body 11 to other equipment such as a car by using bolts or screws to pass through the connecting holes 114. In order to avoid interference and prevent the connecting frame body 113 from deforming after connection, the end portions of any two adjacent connecting frame bodies 113 are spaced apart and do not contact each other. Among them, two oppositely distributed connecting frame bodies 113 are provided with avoiding through grooves 115 which penetrate the connecting frame body 113 along the thickness direction and are back through, so as to reduce weight and avoid interference. In another embodiment, the connecting frame body 113 is provided with only two connecting frame bodies which are arranged on the two sides of the main frame body 11 along the width direction.

[0033] In the content defined by the embodiment, the secondary frame body 12 includes a partition part 121 connected to the main frame body 11 at both ends and a fitting part 122 connected to one side of the partition part 121 towards the second side 112 of the main frame body 11, the partition part 121 is used to support and reinforce the main frame body 11, and the fitting part 122 reinforces the auxiliary connecting part 5 in cooperation with the water-cooled plate 4 and supports the water-cooled plate 4, and at the same time, the fitting part 122 can also reduce the possibility of deformation of the water-cooled plate 4 to a certain extent. The secondary frame body 12 is provided as at least one, which can be provided as two or three, and the number of the secondary frame body 12 is determined according to the actual battery system. When the secondary frame body 12 is at least two, each secondary frame body 12 is distributed along the length direction, and the length direction of each secondary frame body 12 is distributed along the width direction of the battery box structure, and the corresponding partition part 121 and fitting part 122 are adaptively distributed. Both ends of each partition part 121 are welded to the inner side surface 131 of the main frame body 11 on both opposite sides, that is, each partition part 121 is welded to the inner wall of the containing space 14. The partition part 121 and the fitting part 122 are fixedly connected and are both made of metal honeycomb plates. Due to the existence of the support frame 13, in order to make the connection between the secondary frame body 12 and the main frame body 11 more stable, the fitting part 122 is shorter than the partition part 121 and is connected to the middle part of the partition part 121. For this purpose, a notch 123 adapted to the support frame 13 is formed at both ends of the partition part 121 and the fitting part 122. When the both ends of the partition part 121 are connected to the main frame body 11, the notch 123 is supported and riveted to the support frame 13. The partition part 121 is fixedly and sealingly connected to the support frame 13 through the notch 123 by welding. The welding between the partition part 121 and the main frame body 11 is also in a sealing state, so as to further improve the connection strength between the main frame body 11 and the secondary frame body 12.

[0034] The fitting part 122 is fixedly connected to one side of the partition part 121 along the thickness direction (all referring to the thickness direction of the battery box structure, and the length direction and the width direction all refer to the corresponding direction of the battery box structure) towards the second side 112 of the main frame body 11, and the length of the fitting part 122 in the length direction is greater than the length of the partition part 121 in the length direction, so that the both sides of the fitting part 122 in the length direction protrude from the opposite sides of the partition part 121, so as to increase the contact area between the fitting part 122 and the water-cooled plate 4 and improve the stability. The fitting part 122 is formed with a fitting side edge 1221 adapted to the water-cooled plate 4 and the auxiliary connecting structure 2. The side edge of the fitting part 122 facing the water-cooled plate 4 and the auxiliary connecting structure 2 is limited to the fitting side edge 1221, so that after the connection between the frame structure 1, the water-cooled plate 4 and the bottom guard plate 3 is completed, the fitting side edge 1221 is fitted to the water-cooled plate 4 and the auxiliary connecting structure 2 and is sealed by sealing glue, so as to support and reinforce the water-cooled plate 4 and the auxiliary connecting structure 2, reduce the possibility of deformation of the water-cooled plate 4, and improve the overall service life.

[0035] The support frame 13 is in a rectangular frame structure around the inner wall of the containing space 14, and is fixedly connected to the main frame 11 and located on the inner wall of the main frame 11 close to the first side 111. The side of the support frame 13 away from the first side 111 of the main frame 11 in the thickness direction is flush with the second side 112, and the notch 123 of the secondary frame 12 is adapted to the shape of the support frame 13. The support frame 13 can be welded on the main frame 11, and the support frame 13 and the main frame 11 can also be cut from a whole Z-shaped metal honeycomb panel by integral molding. After the battery box structure is assembled, the support frame 13 not only strengthens the structural strength of the main frame 11, but also strengthens the connection strength between the secondary frame 12 and the main frame 11. At the same time, the support frame 13 separates the auxiliary connection structure 2 from the main frame 11, which provides a wider operation space for assembling the bottom guard plate 3 and other structures in the containing space 14, so as to facilitate the processing of the battery box structure.

[0036] In this embodiment, the auxiliary connection structure 2 is distributed along the inner wall of the containing space 14 and is in a rectangular frame structure as a whole, and is fixedly connected to the inward side of the support frame 13, so as to separate the auxiliary connection from the main frame 11. In this embodiment, the auxiliary connection structure 2 includes a connection frame 21 distributed on one side of the edge frame structure 1 in the thickness direction and extending inward, and a plurality of avoiding portions 22 formed on the connection frame 21. The connection frame 21 is used for connecting the water-cooled plate 4 and the bottom guard plate 3, and the avoiding portions 22 are used for avoiding the auxiliary equipment when the auxiliary equipment is used, so as to ensure the normal use of the auxiliary equipment and the connection of the water-cooled plate 4 and the bottom guard plate 3.

[0037] In the content defined by the embodiment, the connecting frame 21 is hollow inside supported by a metal honeycomb plate, and the connecting frame 21 is distributed in a closed loop along the inner side of the support frame. The connecting frame 21 includes a connecting surface 211 connected to the frame structure 1, and an inclined surface 212 connected to the frame structure 1 and the connecting surface 211 respectively, the connecting surface 211 is used to connect with the water cooling plate 4 and the bottom guard plate 3, the inclined surface 212 is inclined to the frame structure 1 and forms an installation space 213 distributed at an acute angle outwardly to the frame between the connecting surface 211, and the avoiding part 22 is formed on the inclined surface 212. One side of the connecting surface 211 is fixedly connected to the inner side 131 of the support frame body 13, and the other side of the connecting surface 211 extends inwardly so that the connecting surface 211 is flush with the first side 111 of the main frame body 11 and the support frame body 13. A support groove 214 is recessed on the side of the connecting surface 211 away from the inclined surface 212 in the thickness direction, the support groove 214 penetrates inwardly and penetrates the connecting surface 211 in the thickness direction away from the first side 111, and the side edges of the water cooling plate 4 and the bottom guard plate 3 are stacked in the support groove 214 in the thickness direction, so that the water cooling plate 4 and the bottom guard plate 3 are connected to the connecting surface 211, and the connecting surface 211 is fixedly connected to the support frame body 13, and the support frame body 13 is fixedly connected to the main frame body 11, so that the water cooling plate 4 and the bottom guard plate 3 can be connected to the main frame body 11 together, realizing the connection of the battery box structure, reducing the processing technology, and saving the cost to a certain extent. Among them, the connecting surface 211 can be integrally connected to the support frame body 13 and integrally formed on the main frame body 11. One side of the inclined surface 212 is fixedly connected to the inner side 131 of the support frame body 13 away from the connecting surface 211, and the other side of the inclined surface 212 is fixedly connected to the inner side of the connecting surface 211, so that the auxiliary connecting structure 2 is V-shaped, and the included angle between the connecting surface 211 and the inclined surface 212 is acute, so that the connecting surface 211, the inclined surface 212 and the support frame body 13 support the installation space 213 formed in a triangular prism shape, which reduces the material of the auxiliary connecting structure 2 while making the structure of the auxiliary connecting structure 2 more stable, and the support groove 214 is in the thickness direction opposite to the installation space 213. The inclined surface 212 can be integrally connected to the support frame body 13, so that the auxiliary connecting structure 2 is integrally connected to the main frame body 11. The abutting side edge 1221 has a horizontal side edge abutting the water cooling plate 4 and an inclined side edge abutting the inclined surface 212 to adapt to it, and when the water cooling plate 4 and the bottom guard plate 3 are connected to the auxiliary connecting structure 2, the abutting side edge 1221 abuts the water cooling plate 4 and the inclined surface 212.

[0038] In the content defined by the embodiment, the avoiding portion 22 includes an avoiding hole which is opened through the inclined surface 212 along the thickness direction, and the avoiding hole of each avoiding portion 22 is distributed equidistantly on the inclined surface 212 around the inner wall of the accommodating space 14. Since the inclined surface 212 is arranged obliquely, the avoiding hole of each avoiding portion 22 is arranged towards the accommodating space 14. When the auxiliary equipment is connected to the water-cooling plate 4, the bottom guard plate 3 and the connecting surface 211 from the first side 111 towards the second side 112 along the thickness direction or from the second side 112 towards the first side 111, the avoiding hole can provide an avoiding for the auxiliary equipment, so that the part of the auxiliary equipment which is too long when the connecting member penetrates into the mounting space 213 or the output part of the auxiliary equipment itself can freely penetrate into the mounting space 213, and the use of the auxiliary equipment is facilitated.

[0039] It should be noted that the auxiliary connecting structure 2 is not limited to the structure of the embodiment, and other structures can be used for replacement, such as the auxiliary connecting structure 2 can be a quadrangular prism structure, and the auxiliary connecting structure 2 includes a connecting surface 211 and an L-shaped surface which is L-shaped and is connected to the connecting surface 211 and the inner side surface 131 of the support frame 13, respectively, and avoiding through holes which are communicated are opened on both side surfaces of the L-shaped surface, so as to avoid the auxiliary equipment.

[0040] In the embodiment, the bottom guard plate 3 and the water cooling plate 4 are both rectangular sheet structures, and are adapted to the size of the cavity structure surrounded by each supporting groove 214. The water cooling plate 4 has a water cooling space inside, so that the water cooling plate 4 has a double-layer structure and the inside is convenient for arranging the water cooling structure. The length and width of the bottom guard plate 3 are consistent with the water cooling plate 4 and are consistent with the length and width of the cavity structure. In order to facilitate the setting of the water cooling plate 4, the bottom guard plate 3 is recessed with a buffer space 31 on the side away from the water cooling plate 4 along the thickness direction, and a buffer pad is installed in the buffer space 31 to increase the compression resistance of the battery box structure and improve the installation of the battery box structure. A plurality of reinforcing protrusions are protruded on the bottom guard plate 3 and on the inner wall of the buffer space 31 towards the side of the water cooling plate 4, so as to reinforce the strength of the bottom guard plate 3. In order to facilitate the connection between the bottom guard plate 3 and the water cooling plate 4, a connecting portion 5 is formed on each side of the bottom guard plate 3 and the water cooling plate 4 corresponding to the position of the auxiliary connecting structure 2. Each connecting portion 5 is connected in the supporting groove 214 of the auxiliary connecting structure 2 along the thickness direction, so as to realize the connection with the connecting surface 211. In this way, not only can the middle position of the water cooling plate 4 and the bottom guard plate 3 be avoided, but also the connection operation is facilitated. The avoiding hole facilitates the use function of the auxiliary equipment, and at the same time, the avoiding hole also facilitates the observation of the situation in the installation space 213 during assembly and connection. The connecting portion 5 of the bottom guard plate 3 and the water cooling plate 4 is formed by extending straight from the side of each to form a rectangular frame structure, and the connecting portion 5 is a sheet. When the connecting piece is used to connect the bottom guard plate 3, the water cooling plate 4 and the connecting surface 211, the connection of the connecting piece can be directly observed, so that the connecting piece in poor connection state can be easily disassembled. The water cooling plate 4 and the bottom guard plate 3 are arranged along the thickness direction, the water cooling plate 4 is located on the side towards the containing space 14, and the bottom guard plate 3 is located on the side away from the containing space 14. During assembly, the water cooling plate 4 and the bottom guard plate 3 are sequentially stacked, and then the connecting portion 5 is embedded in the supporting groove 214. The anchor is riveted on the bottom guard plate 3, the water cooling plate 4 and the connecting surface 211 by using riveting, the anchor extends into the installation space 213, the buffer space 31 is reserved between the water cooling plate 4 and the bottom guard plate 3, and in order to facilitate sealing, the connecting portion 5 of the water cooling plate 4 is coated with sealing glue before riveting.

[0041] The working mode of one of the embodiments of the battery box structure of the utility model is as follows: during assembly, the water cooling plate 4 and the bottom guard plate 3 are sequentially stacked along the thickness direction, and then the connecting portion 5 is embedded in the supporting groove 214. The bottom guard plate 3 and the water cooling plate 4 are riveted on the connecting surface 211 by using the auxiliary equipment and the SPR process (self-punching riveting process) along the thickness direction through the rivet alignment connecting portion 5. The connection of the bottom guard plate 3, the water cooling plate 4 and the frame structure 1 is completed without damaging the structure of the bottom guard plate 3, the water cooling plate 4 and the connecting surface 211 as much as possible, without separate operation, and the process flow and time are saved. It should be noted that the connecting piece mentioned in the foregoing refers to the rivet.

[0042] The above embodiments only express the preferred embodiments of the utility model, the description is more specific and detailed, but can not therefore be understood as the restriction of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, under the premise of not departing from the utility model concept, still can make a number of deformation and improvement, these all belong to the protection scope of the utility model. Therefore, the protection range of the utility model patent should be with the attached claims.

Claims

1. A battery case structure comprising a bottom shield, a frame structure, and a water-cooling plate, characterized by: The frame structure is provided with an auxiliary connecting structure for facilitating operation of an external auxiliary device.

2. The battery case structure according to claim 1, wherein: The auxiliary connecting structure is provided with a plurality of avoiding portions for avoiding the external auxiliary device, and each of the connecting portions is connected to the auxiliary connecting structure in a stacking manner corresponding to the avoiding portions.

3. The battery case structure according to claim 2, wherein: The frame structure is internally provided with a containing space penetrating in the thickness direction, and the auxiliary connecting structure is arranged around the inner wall of the containing space.

4. The battery case structure according to claim 3, wherein: The auxiliary connecting structure comprises a connecting frame distributed on one side of the frame structure in the thickness direction and extending inwardly, the connecting frame is hollow inside and has a connecting surface connected to the frame structure for connecting with the connecting portions and an inclined surface connected to the frame structure and the connecting surface respectively, the inclined surface is inclined to the frame structure and forms an installation space with the connecting surface in an acute angle distribution outwardly facing the frame, and the avoiding portions are formed on the inclined surface.

5. The battery case structure according to claim 4, wherein: The avoiding portions comprise avoiding holes penetrating in the thickness direction on the inclined surface, and the avoiding holes of each of the avoiding portions are distributed equidistantly around the inner wall of the containing space.

6. The battery case structure according to claim 4 or 5, wherein: The connecting surface is concavely provided with a support groove corresponding to the installation space on the side away from the inclined surface in the thickness direction, the support groove penetrates inwardly, and the connecting portions of the water-cooled plate and the bottom guard plate are stacked in the thickness direction.

7. The battery case structure according to any one of claims 1 to 5, wherein: Each of the connecting portions is riveted to the auxiliary connecting structure.

8. The battery case structure according to claim 4, wherein: The frame structure comprises a main frame body in a square shape and surrounding the containing space and a plurality of secondary frame bodies arranged in parallel in the containing space, two ends of the secondary frame body are welded to opposite sides of the main frame body respectively, the auxiliary connecting structure is integrally connected to the main frame body, and the secondary frame body has a fitting side edge fitted to the inclined surface and the water-cooled plate when the water-cooled plate and the bottom guard plate are connected to the auxiliary connecting structure.

9. The battery case structure of claim 8, wherein: The frame structure further comprises a support frame body integrally connected to the main frame body and extending inwardly around the containing space, the connecting surface and the inclined surface are connected to an inner side surface of the support frame body inwardly respectively, and the installation space is surrounded between the inclined surface, the connecting surface and the inner side surface. The secondary frame body comprises a partition portion connected to the main frame body at two ends and a fitting portion connected to the partition portion on the side facing the water-cooled plate, the partition portion is supported on the support frame body, and the fitting portion is formed with the fitting side edge adapted to the water-cooled plate and the inclined surface.

10. The battery case structure of claim 6, wherein: The water-cooled plate and the bottom guard plate are arranged in the thickness direction, the water-cooled plate is located on the side facing the containing space, the bottom guard plate is located on the side away from the containing space, a buffer space is formed between the water-cooled plate and the bottom guard plate, and the connecting portions of the water-cooled plate and the bottom guard plate are formed on the side edges thereof respectively and are sealingly connected to the connecting surface.

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