A battery box structure

Abstract

The present invention discloses a battery box structure, which includes a shell, a cooling assembly and an oil seal structure. The shell is formed with an installation cavity and a water inlet hole and a water outlet hole connected with the installation cavity. The installation cavity is used for installing a battery module. The cooling assembly is installed in the installation cavity. The cooling assembly includes a heat exchange part and a water inlet flow path and a water outlet flow path both connected with the heat exchange part. The water inlet flow path has a water inlet end, and a water inlet joint is provided at the water inlet end. The water inlet joint is threadedly connected to the water inlet hole, thereby improving the sealing performance of the connection between the water inlet joint and the water inlet hole. The water outlet flow path has a water outlet end, and a water outlet joint is provided on the water outlet end. The water outlet joint is threadedly connected to the water outlet hole, thereby improving the sealing performance of the connection between the water outlet joint and the water outlet hole. Oil seal structures are provided corresponding to the water inlet hole and the water outlet hole, thereby further improving the sealing performance. The box body will not be deformed, and the effect is good.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a battery box structure. Background Art

[0002] Passenger car battery packs require sealing performance that meets IP67 requirements. The thermal management method currently commonly used for power batteries is liquid cooling. The principle of this cooling solution is: the external cooling system is connected to the inlet and outlet water pipes welded on the battery pack body to connect the liquid cooling plate inside the battery pack, and the battery pack is cooled by adding coolant. The liquid cooling structure requires that water inlet and outlet holes be opened on the battery pack body. After the inlet and outlet water pipes pass through the inlet and outlet holes on the box, the liquid cooling plate inside the battery pack is connected to the external cooling system. Considering that the battery pack must meet the IP67 protection level requirements, welding is generally used between the water pipe and the box to achieve the requirements of tightness and airtightness.

[0003] The solution of welding the water pipe to the box body requires adding a welding process during the box body forming process, which may cause defects such as box body deformation and poor air tightness. Summary of the invention

[0004] The main purpose of the present invention is to propose a battery box structure, aiming to solve the defects of welding the water pipe and the box in the prior art, such as box deformation and poor air tightness.

[0005] To achieve the above-mentioned purpose, the battery box structure proposed by the present invention includes:

[0006] The housing is formed with an installation cavity and a water inlet hole and a water outlet hole communicating with the installation cavity, wherein the installation cavity is used for installing the battery module;

[0007] A cooling assembly is installed in the installation cavity, the cooling assembly includes a heat exchange portion and a water inlet flow path and a water outlet flow path both connected to the heat exchange portion, the water inlet flow path has a water inlet end, the water inlet end is provided with a water inlet joint, the water inlet joint is threadedly connected to the water inlet hole, the water outlet flow path has a water outlet end, the water outlet end is provided with a water outlet joint, the water outlet joint is threadedly connected to the water outlet hole; and,

[0008] The oil seal structure is arranged corresponding to the water inlet hole and the water outlet hole.

[0009] Optionally, the inner wall surface of the water inlet hole is provided with a conical internal thread, the outer wall surface of the water inlet connector is provided with a conical external thread matching the conical internal thread, and the water inlet connector is threadedly connected to the water inlet hole; and / or,

[0010] The inner wall surface of the water outlet hole is provided with a conical internal thread, the outer wall surface of the water outlet joint is provided with a conical external thread matching the conical internal thread, and the water outlet joint is threadedly connected to the water inlet hole; and / or,

[0011] The water inlet and the water outlet are arranged on the same side of the shell; and / or,

[0012] The housing is provided with a first groove corresponding to the water inlet hole, the first groove is communicated with the water inlet hole, the oil seal structure comprises a first cover plate, the first cover plate is penetrated with a first fitting hole, the first cover plate is fitted on the water inlet joint through the first fitting hole, and the sealing cover is provided in the first groove to form a first cavity, the first cavity is used to contain oil; and / or,

[0013] The shell is provided with a second groove corresponding to the water outlet, and the second groove is communicated with the water outlet. The oil seal structure includes a second cover plate, and the second cover plate is penetrated by a second fitting hole. The second cover plate is fitted on the water outlet joint through the second fitting hole, and the sealing cover is provided in the second groove to form a second cavity, and the second cavity is used to contain oil.

[0014] Optionally, the upper side end of the first cover plate is further provided with a first refueling hole, the first refueling hole being connected to the first cavity; and / or,

[0015] A second refueling hole is further provided at the side end of the second cover plate, and the second refueling hole is connected to the second cavity; and / or,

[0016] The periphery of the first cover plate and the side wall of the first groove are threadedly connected via a threaded structure, and the first set hole and the water inlet joint are threadedly connected via a threaded structure; and / or,

[0017] The periphery of the second cover plate and the side wall surface of the second groove are threadedly connected via a threaded structure, and the second set hole and the water outlet joint are threadedly connected via a threaded structure.

[0018] Optionally, the first refueling hole is arranged to be gradually inclined downward in a direction toward the first groove; and / or,

[0019] The second refueling hole is arranged to be gradually inclined downward in a direction toward the second groove.

[0020] Optionally, it further comprises a first rubber plug, wherein the first rubber plug is used to plug the first refueling hole; and / or,

[0021] It also includes a second rubber plug, which is used to plug the second refueling hole.

[0022] Optionally, a plurality of reinforcing parts are further arranged in the shell, the plurality of reinforcing parts are arranged at intervals along the length direction of the shell, and are all extended along the width direction of the shell, and two ends of each reinforcing part are respectively abutted against inner wall surfaces of the shell that are arranged oppositely along the width direction; and / or,

[0023] The shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are buckled together to form the installation cavity, wherein the upper shell and the lower shell are threadedly connected via a threaded structure.

[0024] Optionally, a sealing gasket is further included, and the sealing gasket is clamped between the upper shell and the lower shell.

[0025] Optionally, a plurality of heat exchange parts are provided, each of which includes a water inlet heat exchange part and a water outlet heat exchange part, and the water inlet heat exchange part and the water outlet heat exchange part corresponding to each heat exchange part are connected through a connecting pipe;

[0026] The water inlet flow path is connected to the water inlet heat exchange parts of the plurality of heat exchange parts;

[0027] The water outlet flow path is communicated with the water outlet heat exchange parts of the plurality of heat exchange parts.

[0028] Optionally, the oil seal structure is arranged inside the installation cavity, and the battery box structure further includes a first limiting portion arranged outside the installation cavity, the first limiting portion is penetrated by a first threaded hole, and the first limiting portion is threadedly connected to the water inlet joint through the first threaded hole; and / or,

[0029] The oil seal structure is arranged on the inner side of the installation cavity, and the battery box structure also includes a second limiting portion arranged on the outer side of the installation cavity, the second limiting portion is penetrated by a second threaded hole, and the second limiting portion is threadedly connected to the water outlet joint through the second threaded hole.

[0030] Optionally, a first annular groove is provided on the side of the first limiting portion facing the housing, the first annular groove is coaxially arranged with the first threaded hole, and a first sealing ring is installed in the first annular groove, the first sealing ring is used to seal the gap between the first limiting portion and the housing; and / or,

[0031] A second annular groove is provided on the side of the second limiting portion facing the shell, the second annular groove is coaxially arranged with the second threaded hole, and a second sealing ring is installed in the second annular groove, the second sealing ring is used to seal the gap between the second limiting portion and the shell.

[0032] In the technical solution provided by the present invention, since the battery module is installed in the installation cavity and a cooling component is installed in the installation cavity, the battery module is cooled. Specifically, the cooling component includes a heat exchange part and a water inlet flow path and a water outlet flow path both connected to the heat exchange part. The water inlet flow path has a water inlet end, and the water inlet end is provided with a water inlet joint. The water inlet joint is threadedly connected to the water inlet hole, which improves the sealing of the connection between the water inlet joint and the water inlet hole and is easy to disassemble and assemble. The water outlet flow path has a water outlet end, and the water outlet end is provided with a water outlet joint. The water outlet joint is threadedly connected to the water outlet hole, which improves the sealing of the connection between the water outlet joint and the water outlet hole. Oil seal structures are provided corresponding to the water inlet hole and the water outlet hole, which further improves the sealing, and the box body will not be deformed, with good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 A schematic structural diagram of an embodiment of a battery box structure provided by the present invention;

[0035] Figure 2 for Figure 1 A schematic cross-sectional view of the battery box structure;

[0036] Figure 3 for Figure 2 A schematic diagram of the structure of the middle and lower shell and cooling assembly;

[0037] Figure 4 for Figure 3 A partial enlarged schematic diagram of the water inlet and outlet joints.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] Passenger car battery packs require sealing performance that meets IP67 requirements. The thermal management method currently commonly used for power batteries is liquid cooling. The principle of this cooling solution is: the external cooling system is connected to the inlet and outlet water pipes welded on the battery pack body to connect the liquid cooling plate inside the battery pack, and the battery pack is cooled by adding coolant. The liquid cooling structure requires that water inlet and outlet holes be opened on the battery pack body. After the inlet and outlet water pipes pass through the inlet and outlet holes on the box, the liquid cooling plate inside the battery pack is connected to the external cooling system. Considering that the battery pack must meet the IP67 protection level requirements, welding is generally used between the water pipe and the box to achieve the requirements of tightness and airtightness.

[0046] The solution of welding the water pipe to the box body requires adding a welding process during the box body forming process, which may cause defects such as box body deformation and poor air tightness.

[0047] The present invention provides a battery box structure, wherein: Figures 1 to 4 A schematic structural diagram of an embodiment of the battery box structure provided by the present invention.

[0048] See also Figures 1 to 4 The battery box structure 100 includes a shell 1, a cooling assembly 2 and an oil seal structure 3. The shell 1 is formed with an installation cavity 11 and a water inlet hole and a water outlet hole connected to the installation cavity. The installation cavity 11 is used for installing a battery module. The cooling assembly 2 is installed in the installation cavity 11. The cooling assembly 2 includes a heat exchange part 21 and a water inlet flow path 22 and a water outlet flow path 23 both connected to the heat exchange part 21. The water inlet flow path 22 has a water inlet end, and the water inlet end is provided with a water inlet joint 221. The water inlet joint 221 is threadedly connected to the water inlet hole. The water outlet flow path 23 has a water outlet end, and a water outlet joint 231 is provided on the water outlet end. The water outlet joint 231 is threadedly connected to the water outlet hole. The oil seal structure 3 is arranged corresponding to the water inlet hole and the water outlet hole.

[0049] In the technical solution provided by the present invention, since the battery module is installed in the installation cavity 11, and the cooling component 2 is installed in the installation cavity 11, the battery module is cooled. Specifically, the cooling component 2 includes a heat exchange part 21 and a water inlet flow path 22 and a water outlet flow path 23 both connected to the heat exchange part 21. The water inlet flow path 22 has a water inlet end, and the water inlet end is provided with a water inlet joint 221. The water inlet joint 221 is threadedly connected to the water inlet hole, which improves the sealing of the connection between the water inlet joint 221 and the water inlet hole, and is easy to disassemble and assemble. The water outlet flow path 23 has a water outlet end, and the water outlet end is provided with a water outlet joint 231. The water outlet joint 231 is threadedly connected to the water outlet hole, which improves the sealing of the connection between the water outlet joint 231 and the water outlet hole. An oil seal structure 3 is provided corresponding to the water inlet hole and the water outlet hole, which further improves the sealing, and the box body will not be deformed, and the effect is good.

[0050] Specifically, the inner wall surface of the water inlet hole is provided with a conical internal thread, and the outer wall surface of the water inlet joint 221 is provided with a conical external thread matched with the conical internal thread. The water inlet joint 221 is threadedly connected to the water inlet hole, so that the water inlet joint 221 and the water inlet hole are sealed and connected, which is simple to operate and easy to install.

[0051] Specifically, the inner wall surface of the water outlet hole is provided with a conical internal thread, and the outer wall surface of the water outlet joint 231 is provided with a conical external thread matched with the conical internal thread. The water outlet joint 231 is threadedly connected to the water inlet hole, so that the water outlet joint 231 and the water outlet hole are sealed and connected, which is simple to operate and easy to install.

[0052] The water inlet and the water outlet can be arranged on the opposite sides of the housing 1 or on adjacent sides. Figure 3 and Figure 4 In the embodiment of the present application, the water inlet and the water outlet are arranged on the same side of the shell 1 which is relatively arranged. In this way, the installation is convenient, the structure is compact, and the installation space is reduced.

[0053] Specifically, refer to Figure 2 The shell 1 is provided with a first groove 14 corresponding to the water inlet hole, and the first groove 14 is communicated with the water inlet hole. The oil seal structure 3 includes a first cover plate 31, and the first cover plate 31 is penetrated by a first fitting hole. The first cover plate 31 is fitted on the water inlet joint 221 through the first fitting hole, and the sealing cover is provided in the first groove 14 to form a first cavity a, and the first cavity a is used to contain oil. In this way, the oil can fill the gap between the water inlet joint 221 and the water inlet hole, thereby achieving sealing.

[0054] Specifically, refer to Figure 2 The shell 1 is provided with a second groove 15 corresponding to the water outlet, and the second groove 15 is communicated with the water outlet. The oil seal structure 3 includes a second cover plate 32, and the second cover plate 32 is penetrated by a second set hole. The second cover plate 32 is set on the water outlet joint 231 through the second set hole, and the sealing cover is provided in the second groove 15 to form a second cavity b, and the second cavity b is used to contain oil. In this way, the oil can fill the gap between the water outlet joint 231 and the water outlet, thereby achieving sealing.

[0055] In order to facilitate the addition of oil into the first cavity a, a first refueling hole is further provided at the upper side end of the first cover plate 31, and the first refueling hole is connected to the first cavity a. With such a configuration, oil can be added to the first cavity a from the first refueling hole, ensuring that the amount of oil in the first cavity a can fill the gap between the water inlet joint 221 and the water inlet hole, thereby achieving sealing.

[0056] In order to facilitate the addition of oil into the second cavity b, a second refueling hole is further provided at the upper side end of the second cover plate 32, and the second refueling hole is connected to the second cavity b. In this way, oil can be added to the second cavity b from the second refueling hole, ensuring that the amount of oil in the second cavity b can fill the gap between the water outlet joint 231 and the water outlet hole, thereby achieving sealing.

[0057] Specifically, the periphery of the first cover plate 31 and the side wall surface of the first groove 14 are threadedly connected via a threaded structure, and the first set hole and the water inlet joint 221 are threadedly connected via a threaded structure. Such an arrangement enables the first cover plate 31 to be sealedly connected to the side wall surface of the first groove 14, and the first cover plate 31 to be sealedly connected to the water inlet joint 221, thereby ensuring sealing performance and achieving good effect.

[0058] Specifically, the periphery of the second cover plate 32 and the side wall surface of the second groove 15 are threadedly connected via a threaded structure, and the second set hole and the water outlet joint 231 are threadedly connected via a threaded structure. Such an arrangement enables the second cover plate 32 to be sealedly connected to the side wall surface of the second groove 15, and the second cover plate 32 to be sealedly connected to the water outlet joint 231, thereby ensuring sealing performance and achieving good effect.

[0059] It should be noted that, in the above embodiment, the first groove 14 and the second groove 15 can be provided separately or in communication with each other, and the present application does not limit this.

[0060] Reference Figure 2 The first refueling hole is gradually inclined downward in the direction toward the first groove 14. This arrangement slows down the speed at which the oil slides down and avoids splashing of the oil when adding the oil. In addition, since the first refueling port 311 is inclined upward, it is convenient to add the oil and the operation is easy.

[0061] Reference Figure 2 The second refueling hole is gradually inclined downward in the direction toward the second groove 15. This arrangement slows down the speed at which the oil slides down and avoids splashing of the oil when adding the oil. In addition, since the second refueling port 321 is inclined upward, it is convenient to add the oil and the operation is easy.

[0062] Furthermore, the battery box structure 100 further includes a first rubber plug 41 , which blocks the first refueling hole to prevent the oil from leaking out of the first refueling hole after the oil is added.

[0063] Furthermore, the battery box structure 100 further includes a second rubber plug 42, which blocks the second refueling hole to prevent the oil from leaking out of the second refueling hole after the oil is added.

[0064] In order to improve the strength of the housing 1, refer to Figure 3A plurality of reinforcing parts 5 are further provided in the shell 1. The plurality of reinforcing parts 5 are arranged at intervals along the length direction of the shell 1 and are all extended along the width direction of the shell 1. Both ends of each reinforcing part 5 are respectively abutted against the inner wall surface of the shell 1 which is arranged opposite to each other along the width direction. In this way, the inner wall surface of the shell 1 is supported by the reinforcing parts 5, so that the overall strength of the shell 1 is increased to prevent the shell 1 from being deformed.

[0065] To facilitate the installation of the battery module, refer to Figure 1 and Figure 3 The shell 1 includes an upper shell 1a and a lower shell 1b, and the upper shell 1a and the lower shell 1b are buckled together to form the installation cavity 11, wherein the upper shell 1a and the lower shell 1b are threadedly connected through a threaded structure. In this way, when the battery module needs to be installed, the threaded upper shell 1a and the lower shell 1b are separated, and the battery module is installed in the lower shell 1b, and then the upper shell 1a and the lower shell 1b are buckled together, and then the upper shell 1a and the lower shell 1b are threadedly connected. In this way, the installation is convenient and the effect is good.

[0066] Furthermore, the battery box structure 100 also includes a sealing gasket c, which is clamped between the upper shell 1a and the lower shell 1b. The sealing gasket c seals the gap between the upper shell 1a and the lower shell 1b, thereby improving the sealing of the upper shell 1a and the lower shell 1b, with good effect.

[0067] Specifically, refer to Figure 3 , the heat exchange part 21 is provided in plurality, each of the heat exchange parts 21 includes a water inlet heat exchange part 21a and a water outlet heat exchange part 21b, the water inlet heat exchange part 21a and the water outlet heat exchange part 21b corresponding to each of the heat exchange parts 21 are connected through a connecting pipe, the water inlet flow path 22 is connected with the water inlet heat exchange parts 21a of the plurality of heat exchange parts 21, and the water outlet flow path 23 is connected with the water outlet heat exchange parts 21b of the plurality of heat exchange parts 21, so that the coolant on the water inlet flow path 22 flows into the plurality of water inlet heat exchange parts 21a respectively, the coolant of the plurality of water inlet heat exchange parts 21a flows into the plurality of water outlet heat exchange parts 21b through the plurality of connecting pipes, the coolant of the plurality of water outlet heat exchange parts 21b converges with the water outlet flow path 23, and is finally discharged out of the shell 1, thereby realizing heat exchange and cooling of the battery.

[0068] It should be noted that the principle of heat exchange and cooling of the battery module by means of a coolant is a known technology, and the present application will not go into details here.

[0069] The oil seal structure 3 can be arranged on the outside of the battery 1 or on the inside of the shell 1. Specifically, in the embodiment of the present application, the oil seal structure 3 is arranged on the inside of the installation cavity 11, and the battery box structure 100 also includes a first limiting portion 61 arranged on the outside of the installation cavity 11, and the first limiting portion 61 is penetrated by a first threaded hole, and the first limiting portion 61 is threadedly connected to the water inlet connector 221 through the first threaded hole. With such an arrangement, after the first limiting portion 61 is threadedly connected to the water inlet connector 221, the first limiting portion 61 can be tightly pressed against the outer wall surface of the shell 1, thereby realizing the limiting locking of the water inlet connector 221 and the shell, which is convenient for installation.

[0070] The oil seal structure 3 can be arranged on the outside of the battery 1 or on the inside of the shell 1. The oil seal structure 3 is arranged on the inside of the installation cavity 11. The battery box structure 100 also includes a second limiting portion 62 arranged on the outside of the installation cavity 11. The second limiting portion 62 is penetrated by a second threaded hole. The second limiting portion 62 is threadedly connected to the water outlet connector 231 through the second threaded hole. With such an arrangement, after the second limiting portion 62 is threadedly connected to the water outlet connector 231, the second limiting portion 62 can be tightly pressed against the outer wall surface of the shell 1, thereby realizing the limiting locking of the water outlet connector 231 and the shell, which is convenient for installation and ensures sealing.

[0071] Specifically, a first annular groove is provided on the side of the first limiting portion 61 facing the shell 1, the first annular groove is coaxially arranged with the first threaded hole, and a first sealing ring 71 is installed in the first annular groove. The first sealing ring 71 seals the gap between the first limiting portion 61 and the shell 1, thereby ensuring the sealing performance and achieving a good effect.

[0072] Specifically, a second annular groove 72 is provided on the side of the second limiting portion 62 facing the shell 1, the second annular groove is coaxially arranged with the second threaded hole, and a second sealing ring 72 is installed in the second annular groove. The second sealing ring 72 seals the gap between the second limiting portion 62 and the shell 1, thereby ensuring the sealing performance and achieving good effect.

[0073] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery box structure, characterized in that: include: A shell is formed with an installation cavity and a water inlet hole and a water outlet hole communicating with the installation cavity, the installation cavity is used for installing a battery module, and the water inlet hole and the water outlet hole are arranged on the same side of the shell; A cooling assembly is installed in the installation cavity, the cooling assembly includes a heat exchange portion and a water inlet flow path and a water outlet flow path both connected to the heat exchange portion, the water inlet flow path has a water inlet end, the water inlet end is provided with a water inlet joint, the water inlet joint is threadedly connected to the water inlet hole, the water outlet flow path has a water outlet end, the water outlet end is provided with a water outlet joint, the water outlet joint is threadedly connected to the water outlet hole; and, An oil seal structure, arranged corresponding to the water inlet hole and the water outlet hole; The inner wall surface of the water inlet hole is provided with a conical internal thread, the outer wall surface of the water inlet joint is provided with a conical external thread matching the conical internal thread, and the water inlet joint is threadedly connected to the water inlet hole; The shell is provided with a first groove corresponding to the water inlet hole, and the first groove is communicated with the water inlet hole. The oil seal structure includes a first cover plate, and the first cover plate is penetrated by a first fitting hole. The first cover plate is fitted on the water inlet joint through the first fitting hole, and the sealing cover is provided in the first groove to form a first cavity, and the first cavity is used to contain oil.

2. The battery box structure according to claim 1, characterized in that: The inner wall surface of the water outlet hole is provided with a conical internal thread, the outer wall surface of the water outlet joint is provided with a conical external thread matching the conical internal thread, and the water outlet joint is threadedly connected to the water inlet hole; and / or, The shell is provided with a second groove corresponding to the water outlet, and the second groove is communicated with the water outlet. The oil seal structure includes a second cover plate, and the second cover plate is penetrated by a second fitting hole. The second cover plate is fitted on the water outlet joint through the second fitting hole, and the sealing cover is provided in the second groove to form a second cavity, and the second cavity is used to contain oil.

3. The battery box structure according to claim 2, characterized in that: The upper side end of the first cover plate is further provided with a first refueling hole, and the first refueling hole is connected to the first cavity; and / or, A second refueling hole is further provided at the side end of the second cover plate, and the second refueling hole is connected to the second cavity; and / or, The periphery of the first cover plate and the side wall of the first groove are threadedly connected via a threaded structure, and the first set hole and the water inlet joint are threadedly connected via a threaded structure; and / or, The periphery of the second cover plate and the side wall surface of the second groove are threadedly connected via a threaded structure, and the second set hole and the water outlet joint are threadedly connected via a threaded structure.

4. The battery box structure according to claim 3, characterized in that: The first refueling hole is arranged to be gradually inclined downward in a direction toward the first groove; and / or, The second refueling hole is arranged to be gradually inclined downward in a direction toward the second groove.

5. The battery box structure according to claim 3, characterized in that: It also includes a first rubber plug, the first rubber plug is used to plug the first refueling hole; and / or, It also includes a second rubber plug, which is used to plug the second refueling hole.

6. The battery box structure according to claim 1, characterized in that: A plurality of reinforcing parts are further arranged in the shell, and the plurality of reinforcing parts are arranged at intervals along the length direction of the shell and are all extended along the width direction of the shell, and two ends of each reinforcing part are respectively abutted against the inner wall surface of the shell arranged opposite to each other along the width direction; and / or, The shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are buckled together to form the installation cavity, wherein the upper shell and the lower shell are threadedly connected via a threaded structure.

7. The battery box structure according to claim 6, characterized in that: A sealing gasket is also included, and the sealing gasket is sandwiched between the upper shell and the lower shell.

8. The battery box structure according to claim 1, characterized in that: The heat exchange parts are provided in plurality, each of the heat exchange parts comprises a water inlet heat exchange part and a water outlet heat exchange part, and the water inlet heat exchange part and the water outlet heat exchange part corresponding to each of the heat exchange parts are connected via a connecting pipe; The water inlet flow path is connected to the water inlet heat exchange parts of the plurality of heat exchange parts; The water outlet flow path is communicated with the water outlet heat exchange parts of the plurality of heat exchange parts.

9. The battery box structure according to claim 1, characterized in that: The oil seal structure is arranged inside the installation cavity, and the battery box structure further comprises a first limiting portion arranged outside the installation cavity, the first limiting portion is penetrated by a first threaded hole, and the first limiting portion is threadedly connected to the water inlet joint through the first threaded hole; and / or, The oil seal structure is arranged on the inner side of the installation cavity, and the battery box structure also includes a second limiting portion arranged on the outer side of the installation cavity, the second limiting portion is penetrated by a second threaded hole, and the second limiting portion is threadedly connected to the water outlet joint through the second threaded hole.

10. The battery box structure according to claim 9, characterized in that: A first annular groove is provided on the side of the first limiting portion facing the housing, the first annular groove is coaxially arranged with the first threaded hole, and a first sealing ring is installed in the first annular groove, the first sealing ring is used to seal the gap between the first limiting portion and the housing; and / or, A second annular groove is provided on the side of the second limiting portion facing the shell, the second annular groove is coaxially arranged with the second threaded hole, and a second sealing ring is installed in the second annular groove, the second sealing ring is used to seal the gap between the second limiting portion and the shell.

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