Immersed battery box body, battery pack and electric equipment

Abstract

The utility model belongs to the field of battery boxes, and particularly relates to an immersed battery box body, a battery pack and electric equipment. In order to prevent immersion liquid from leaking out of the lower box body from the butt joint position of the lower box body and the box cover, the utility model discloses the immersed battery box body, the immersed battery box comprises the box cover and the lower box body used for containing the immersion liquid, and a sealing ring is arranged between the box cover and the lower box body. The lower box body and the box cover are each provided with an annular glue containing groove used for containing a sealing glue solution, and the annular glue containing grooves in the lower box body and the box cover are communicated with each other. The utility model also discloses a battery pack and electric equipment using the immersed battery box. By means of two seals of the sealing glue solution and the sealing ring, immersion liquid is better prevented from leaking out of the lower box body from the butt joint position of the lower box body and the box cover.

Description

Technical Field

[0001] The utility model belongs to the field of battery boxes, and in particular relates to an immersion type battery box, a battery pack and electrical equipment. Background Art

[0002] In order to improve the heat dissipation efficiency of the battery, there is an immersion-type battery pack in the prior art in which the battery cells are immersed in an immersion liquid, so as to directly dissipate the heat of the battery cells using the immersion liquid.

[0003] For example, the Chinese utility model patent with authorization announcement number CN214848772U and authorization announcement date 2021.11.23 discloses an immersed battery box, which includes a lower box body, a box cover, a battery module and an electronic fluoride liquid (equivalent to an immersion liquid). The battery module is arranged in the lower box body, and the electronic fluoride liquid is filled in the lower box body and the battery module is immersed in the electronic fluoride liquid. The lower box body is equipped with a liquid circulation component, which includes a liquid inlet pipe and a liquid discharge pipe. The colder electronic fluoride liquid enters the lower box body through the liquid inlet pipe, and the hotter electronic fluoride liquid after heat exchange with the battery module is discharged from the lower box body through the liquid discharge pipe. In order to prevent the electronic fluoride liquid from leaking out of the lower box body, a sealing ring is also provided between the lower box body and the box cover.

[0004] When the above-mentioned immersed battery box is used in an off-road vehicle, the electronic fluoride liquid in the immersed battery box will shake and leak out of the lower box body and the cover during normal off-road operation. Of course, the above-mentioned immersed battery box can also be used in products such as drones. As long as the immersed battery box moves, the electronic fluoride liquid in the immersed battery box will shake and leak out of the lower box body and the cover as soon as the immersed battery box moves.

[0005] The Chinese utility model patent with authorization announcement number CN221508299U and authorization announcement date 2024.08.09 also discloses a battery immersion liquid cooling system. Paragraph

[0030] of its specification discloses: the battery module is completely immersed in electronic fluorine liquid. When the battery module generates heat during the charging and discharging process, the electronic fluorine liquid absorbs the heat and vaporizes (the boiling point of the electronic fluorine liquid can be 35℃-45℃), thereby quickly taking away a large amount of heat. Afterwards, the electronic fluorine liquid vapor encounters the cold box cover and liquefies. The liquefied electronic fluorine liquid falls again and absorbs the heat of the battery module again.

[0006] In the battery immersion liquid cooling system, even if the battery box does not move, the electronic fluorine liquid will vaporize and leak out of the lower box from the joint between the lower box body and the box cover. The staff must regularly replenish the electronic fluorine liquid into the lower box body.

[0007] In summary, when the electronic fluorine liquid shakes or absorbs heat and vaporizes, the electronic fluorine liquid is likely to leak out of the lower box body from the joint between the lower box body and the box cover. Utility Model Content

[0008] The purpose of the utility model is to provide an immersion type battery box to solve the technical problem that the immersion liquid in the existing battery box easily leaks out of the lower box from the joint between the lower box and the box cover.

[0009] The present invention also aims to provide a battery pack to solve the same technical problem mentioned above.

[0010] The purpose of the present invention is also to provide an electrical device to solve the same technical problem as above.

[0011] The technical solution of the submerged battery box provided by the utility model is:

[0012] An immersion battery box includes a box cover and a lower box body for containing immersion liquid, a sealing ring is installed between the box cover and the lower box body, one of the lower box body and the box cover is provided with an annular glue groove for containing sealing glue liquid, and the other is provided with a bonding plane for bonding with the sealing glue liquid, or both the lower box body and the box cover are provided with an annular glue groove for containing sealing glue liquid, and the annular glue grooves on the lower box body and the box cover are connected to each other.

[0013] Furthermore, the annular rubber groove is located outside the sealing ring.

[0014] Furthermore, the box cover and / or the lower box body are provided with a glue injection hole communicating with the annular glue groove and the external space of the immersion battery box body.

[0015] Furthermore, a threaded hole is provided on the lower box body, and a screw through-hole is provided on the box cover, and the lower box body and the box cover are fixedly connected by screws; the screw through-hole is connected to the annular receiving groove and constitutes the glue injection hole; the threaded hole is a blind hole.

[0016] Furthermore, when an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is not greater than the groove width of the annular plastic groove, and the threaded hole is provided at the groove bottom of the annular plastic groove on the lower box body.

[0017] Furthermore, when an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is larger than the groove width of the annular plastic groove, the annular receiving groove is connected to the threaded hole, and the threaded hole is arranged toward one side of the annular receiving groove.

[0018] Furthermore, the width of the annular adhesive groove becomes narrower as it approaches the bottom of the groove.

[0019] Furthermore, the annular adhesive groove is a V-shaped groove, and the annular adhesive groove includes two inclined groove side walls, and the angles between the groove side walls and the horizontal plane are the same.

[0020] Furthermore, a mounting groove for mounting a sealing ring is provided on the box cover and / or the lower box body.

[0021] The beneficial effects of the submerged battery case provided by the present invention are as follows: the present invention is an improved invention. In addition to the sealing ring provided between the lower case and the case cover, an annular glue groove is also provided on the lower case and / or the case cover. During the manufacturing process of the battery pack, when the case cover needs to be installed on the lower case, sealing glue can be injected into the annular glue groove through the glue injection hole, or the case cover can be directly glued into the annular glue groove and then installed on the lower case, thereby forming a second seal and improving the sealing of the submerged battery case, better preventing the immersion liquid from leaking out of the submerged battery case. At the same time, the sealing glue can also bond the lower case and the case cover together, thereby securing the lower case and the case cover.

[0022] The annular adhesive groove not only accommodates the sealant liquid but also increases the contact area between the sealant liquid and the component where the annular adhesive groove is located. Therefore, when the annular adhesive groove is located on both the lower case and the case lid, the sealant liquid has a larger contact area with both the lower case and the case lid, thereby improving the bonding strength and sealing between the lower case and the case lid. Of course, providing the annular adhesive groove on only one of the lower case and the case lid will also achieve a seal between the lower case and the case lid.

[0023] The technical solution of the battery pack provided by the utility model is:

[0024] A battery pack comprises an immersed battery case, a battery module installed in the immersed battery case, and an immersion liquid filled in the immersed battery case and immersing the battery module. The immersed battery case comprises a case cover and a lower case for containing the immersion liquid. A sealing ring is installed between the case cover and the lower case. One of the lower case and the case cover is provided with an annular glue groove for containing the sealing glue liquid, and the other is provided with a bonding plane for bonding with the sealing glue liquid. Alternatively, both the lower case and the case cover are provided with an annular glue groove for containing the sealing glue liquid, and the annular glue grooves on the lower case and the case cover are connected to each other; the case cover and / or the lower case are provided with a glue injection hole connecting the annular glue groove and the external space of the immersed battery case.

[0025] Furthermore, the annular rubber groove is located outside the sealing ring.

[0026] Furthermore, a threaded hole is provided on the lower box body, and a screw through-hole is provided on the box cover, and the lower box body and the box cover are fixedly connected by screws; the screw through-hole is connected to the annular receiving groove and constitutes the glue injection hole; the threaded hole is a blind hole.

[0027] Furthermore, when an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is not greater than the groove width of the annular plastic groove, and the threaded hole is provided at the groove bottom of the annular plastic groove on the lower box body.

[0028] Furthermore, when an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is larger than the groove width of the annular plastic groove, the annular receiving groove is connected to the threaded hole, and the threaded hole is arranged toward one side of the annular receiving groove.

[0029] Furthermore, the width of the annular adhesive groove becomes narrower as it approaches the bottom of the groove.

[0030] Furthermore, the annular adhesive groove is a V-shaped groove, and the annular adhesive groove includes two inclined groove side walls, and the angles between the groove side walls and the horizontal plane are the same.

[0031] Furthermore, a mounting groove for mounting a sealing ring is provided on the box cover and / or the lower box body.

[0032] The battery pack provided by the present invention has the following beneficial effects: This invention is an improved invention. In addition to the sealing ring provided between the lower case and the case cover, an annular adhesive groove is also provided on the lower case and / or the case cover. During the battery pack manufacturing process, when the case cover needs to be installed on the lower case, sealing glue can be injected into the annular adhesive groove through the glue injection hole, or glue can be directly applied to the annular adhesive groove before the case cover is installed on the lower case. This forms a second seal and improves the sealing of the submerged battery case, better preventing the immersion liquid from leaking out of the submerged battery case. At the same time, the sealing glue can also bond the lower case and the case cover together, thereby securing the lower case and the case cover.

[0033] The annular adhesive groove not only accommodates the sealant liquid but also increases the contact area between the sealant liquid and the component where the annular adhesive groove is located. Therefore, when the annular adhesive groove is located on both the lower case and the case lid, the sealant liquid has a larger contact area with both the lower case and the case lid, thereby improving the bonding strength and sealing between the lower case and the case lid. Of course, providing the annular adhesive groove on only one of the lower case and the case lid will also achieve a seal between the lower case and the case lid.

[0034] The technical solution of the electrical equipment provided by the utility model is:

[0035] An electrical device includes a battery pack, which includes an immersion battery case, a battery module installed in the immersion battery case, and immersion liquid filled in the immersion battery case and immersing the battery module. The immersion battery case includes a case cover and a lower case for containing the immersion liquid. A sealing ring is installed between the case cover and the lower case. One of the lower case and the case cover is provided with an annular glue groove for containing the sealing glue liquid, and the other is provided with a bonding plane for bonding with the sealing glue liquid. Alternatively, both the lower case and the case cover are provided with an annular glue groove for containing the sealing glue liquid, and the annular glue grooves on the lower case and the case cover are connected to each other; the case cover and / or the lower case are provided with a glue injection hole connecting the annular glue groove and the external space of the immersion battery case.

[0036] Furthermore, the annular rubber groove is located outside the sealing ring.

[0037] Furthermore, a threaded hole is provided on the lower box body, and a screw through-hole is provided on the box cover, and the lower box body and the box cover are fixedly connected by screws; the screw through-hole is connected to the annular receiving groove and constitutes the glue injection hole; the threaded hole is a blind hole.

[0038] Furthermore, when an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is not greater than the groove width of the annular plastic groove, and the threaded hole is provided at the groove bottom of the annular plastic groove on the lower box body.

[0039] Furthermore, when an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is larger than the groove width of the annular plastic groove, the annular receiving groove is connected to the threaded hole, and the threaded hole is arranged toward one side of the annular receiving groove.

[0040] Furthermore, the width of the annular adhesive groove becomes narrower as it approaches the bottom of the groove.

[0041] Furthermore, the annular adhesive groove is a V-shaped groove, and the annular adhesive groove includes two inclined groove side walls, and the angles between the groove side walls and the horizontal plane are the same.

[0042] Furthermore, a mounting groove for mounting a sealing ring is provided on the box cover and / or the lower box body.

[0043] The beneficial effects of the electrical equipment provided by the present invention are as follows: the present invention is an improved invention. In addition to the sealing ring provided between the lower case and the case cover, an annular adhesive groove is also provided on the lower case and / or the case cover. During the manufacturing process of the battery pack, when the case cover needs to be installed on the lower case, sealing glue can be injected into the annular adhesive groove through the glue injection hole, or the case cover can be directly glued into the annular adhesive groove and then installed on the lower case, thereby forming a second seal and improving the sealing of the submerged battery case, better preventing the immersion liquid from leaking out of the submerged battery case. At the same time, the sealing glue can also bond the lower case and the case cover together, thereby securing the lower case and the case cover.

[0044] The annular adhesive groove not only accommodates the sealant liquid but also increases the contact area between the sealant liquid and the component where the annular adhesive groove is located. Therefore, when the annular adhesive groove is located on both the lower case and the case lid, the sealant liquid has a larger contact area with both the lower case and the case lid, thereby improving the bonding strength and sealing between the lower case and the case lid. Of course, providing the annular adhesive groove on only one of the lower case and the case lid will also achieve a seal between the lower case and the case lid. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic structural diagram of the submerged battery box of the present utility model;

[0046] Figure 2 Figure 1 Top view of the middle and lower box and sealing ring;

[0047] Figure 3 for Figure 2 A magnified view of the structure at point A;

[0048] Figure 4 Schematic diagram of the structure of the lower box and the sealing ring;

[0049] Figure 5 Schematic diagram of the structure of the box cover;

[0050] Figure 6 Schematic diagram of the structure at the threaded hole.

[0051] Description of reference numerals:

[0052] 1. Lower box body; 11. Threaded hole; 12. First annular adhesive groove; 121. Groove sidewall; 13. First mounting groove; 2. Box cover; 21. Second mounting groove; 22. Second annular adhesive groove; 3. Screws; 4. Sealing ring. DETAILED DESCRIPTION

[0053] In order to solve the problems in the background technology, the core inventive concept of the present utility model is: on the basis of a sealing structure formed by a sealing ring, a second sealing structure is formed by the sealing glue liquid in the annular glue groove, thereby improving the sealing of the immersed battery box and preventing the immersion liquid from leaking from the lower box body and the box cover to the outside of the lower box body.

[0054] The present invention is further described in detail below with reference to the embodiments.

[0055] Specific embodiments of the submerged battery box provided by the utility model:

[0056] like Figure 1-6As shown, as a specific embodiment, the immersed battery box includes a box cover 2 and a lower box body 1 for containing immersion liquid, a sealing ring 4 is installed between the box cover 2 and the lower box body 1, a first annular glue groove 12 for containing sealing glue liquid is provided on the lower box body 1, and a second annular glue groove 22 for containing sealing glue liquid is provided on the box cover 2, and the annular glue grooves on the lower box body 1 and the box cover 2 are connected to each other.

[0057] In one embodiment, when manufacturing an immersed battery pack, a sealant can be directly applied to the annular sealant groove before the cover 2 is mounted on the lower housing 1. The sealant is preferably a viscous sealant having a viscosity sufficient to adhere to the annular sealant groove without flowing around.

[0058] In other specific embodiments, the box cover 2 and / or the lower box body 1 is provided with a glue injection hole connected to the annular glue groove.

[0059] In other embodiments, referring to Figure 1-6 As shown, an annular glue groove may be provided only on the lower box body 1, and a bonding plane for bonding with the sealing glue liquid may be provided on the lower surface of the box cover 2, so that the lower box body 1 and the box cover 2 are bonded together by the sealing glue liquid; or, an annular glue groove may be provided only on the box cover 2, and a bonding plane for bonding with the sealing glue liquid may be provided on the upper surface of the lower box body 1, so that the lower box body 1 and the box cover 2 are bonded together by the sealing glue liquid.

[0060] Reference Figure 1-6 As shown, in addition to the sealing ring 4 provided between the lower case 1 and the case cover 2, an annular glue groove is also provided on the lower case 1 and / or the case cover 2. During the manufacturing process of the immersed battery pack, when the case cover 2 needs to be installed on the lower case 1, sealing glue can be injected into the annular glue groove through the glue injection hole to form a second seal, thereby improving the sealing of the immersed battery case and better preventing the immersion liquid from leaking out of the lower case 1. At the same time, the sealing glue can also bond the lower case 1 and the case cover 2 together to achieve fixation of the lower case 1 and the case cover 2.

[0061] The annular adhesive groove not only accommodates the sealant liquid but also increases the contact area between the sealant liquid and the component (box cover 2 or lower box body 1) where the annular adhesive groove is provided. Therefore, when the annular adhesive groove is provided on both the lower box body 1 and the box cover 2, the sealant liquid has a larger contact area with both the lower box body 1 and the box cover 2, thereby improving the bonding strength and sealing between the lower box body 1 and the box cover 2. Of course, providing the annular adhesive groove on only one of the lower box body 1 and the box cover 2 will also achieve a complete seal between the lower box body 1 and the box cover 2.

[0062] During the manufacturing process of the submerged battery pack, the sealing ring 4 first needs to be installed between the lower box body 1 and the box cover 2. Then, the box cover 2 needs to be pressed onto the lower box body 1 with a certain pressure. Then, glue needs to be injected into the annular glue groove through the glue injection hole. Finally, the pressure needs to be maintained for 12-26 hours (the specific length depends on the type of sealant) until the sealant is completely solidified.

[0063] During the glue injection and pressure holding process after glue injection, due to the tiny gap between the box cover 2 and the lower box body 1, the sealant liquid will diffuse outside the annular glue groove. On the positive side, the contact area between the box cover 2 and the lower box body 1 and the sealant liquid is increased, which can improve the sealing between the box cover 2 and the lower box body 1. On the negative side, the wall thickness of the lower box body 1 must be able to meet the needs of the sealant liquid diffusion, so as to prevent the sealant liquid from flowing into the immersion liquid in the lower box body 1. This results in a thicker wall thickness of the lower box body 1, which in turn leads to a lower volume energy density of the immersed battery pack. If the sealant liquid diffuses outside the lower box body 1, the staff can directly scrape it off, which will not affect the product quality of the immersed battery pack.

[0064] In order to improve the volume energy density of the immersed battery pack, as a specific implementation method, Figure 1-6 As shown, the annular adhesive groove is located outside the sealing ring 4. When the sealing adhesive liquid diffuses, the sealing ring 4 can prevent the sealing adhesive liquid from flowing into the immersion liquid, thereby reducing the volume of the lower box 1 and improving the volume energy density of the immersion battery pack. However, in other specific embodiments, refer to Figure 1-6 As shown, the annular rubber groove can also be located on the inner side of the sealing ring 4. In this case, the wall thickness of the lower box body 1 is thicker.

[0065] In order to improve the structural strength and simplify the structure of the immersed battery box, as a specific implementation method, Figure 1-6 As shown, the lower case 1 is provided with threaded holes 11, and the cover 2 is provided with screw holes. The lower case 1 and cover 2 are fixedly connected by screws 3. The screw holes communicate with the annular receiving groove and form the glue injection holes. This simple structure allows screws 3 to strengthen the connection between the cover 2 and the lower case 1. During the manufacture of the submerged battery pack, after glue injection is completed and before the sealant solidifies, screws 3 are torqued into threaded holes 11. The sealant also bonds screws 3, the lower case 1, and the cover 2 together.

[0066] However, in other specific embodiments, reference Figure 1-6As shown, the lower box body 1 and the box cover 2 can also be directly bonded together using sealing glue. In this case, it is necessary to additionally set a glue injection hole on the box cover 2 and / or the lower box body 1. When the glue injection hole is set on the box cover 2 and the axis extends vertically, the glue injection hole does not need to be sealed after glue injection. The sealing glue cannot flow out of the glue injection hole under the action of gravity, and the sealing glue will naturally seal the glue hole after solidification; when the glue injection hole is horizontally set on the box cover 2 or the lower box body 1, the glue injection hole needs to be sealed after glue injection to prevent the sealing glue from flowing out of the glue injection hole after glue injection; of course, glue injection holes can also be set on the box cover 2 and the lower box body 1 at the same time.

[0067] like Figure 1-6 As shown, on the basis of a threaded hole 11 being provided on the lower box body 1, in order to improve the volume energy density of the immersion battery pack, as a specific implementation method, when an annular glue groove is provided on the lower box body 1, the threaded hole 11 is connected to the annular glue groove, thereby reducing the wall thickness of the lower box body 1.

[0068] Specifically, if Figure 1-6 As shown, when the inner diameter of the threaded hole 11 is larger than the groove width of the annular plastic groove, the threaded hole 11 is provided on the annular receiving groove, thereby reducing the wall thickness of the lower box body 1; or, referring to Figure 1-6 As shown, when the inner diameter of threaded hole 11 is no greater than the width of the annular adhesive groove, threaded hole 11 is positioned at the bottom of the annular adhesive groove on lower housing 1, thereby reducing the wall thickness of lower housing 1. In this embodiment, threaded hole 11 only needs to overlap at least a portion of the annular receiving groove. However, in other embodiments, threaded hole 11 and the annular receiving groove can be completely offset, in which case the wall thickness of lower housing 1 is thicker.

[0069] like Figure 1-6 As shown, in order to reduce the amount of sealant liquid used, as a specific implementation method, for the annular glue groove, the groove width becomes narrower as it approaches the groove bottom, thereby increasing the surface area to volume ratio of the annular glue groove. When the bonding area (i.e., the surface area of ​​the annular glue groove) remains the same, the amount of sealant liquid used can be reduced, saving raw materials.

[0070] Specifically, if Figure 1-6 As shown, the annular adhesive groove is a "V"-shaped groove, and the annular adhesive groove includes two inclined groove side walls 121, and the angles between the groove side walls 121 and the horizontal plane are the same, and the structure is simple. However, in other specific embodiments, refer to Figure 1-6 As shown, the annular adhesive groove may also include an inclined groove side wall 121 and a vertical groove side wall, or the annular adhesive groove is a rectangular groove including two vertical groove side walls and a horizontal groove bottom wall.

[0071] To further enhance the seal between the lower case 1 and the lid 2, as a specific embodiment, a first mounting groove 13 for mounting the sealing ring 4 is provided on the lower case 1, and a second mounting groove 21 for mounting the sealing ring 4 is provided on the lid 2. The sealing ring 4 is mounted in the first mounting groove 13 and the second mounting groove 21. When the submerged battery pack is in motion, the first mounting groove 13 and the second mounting groove 21 can restrict the position of the sealing ring 4. Compared to a technical solution without mounting grooves, since the side of the sealing ring 4 can also closely contact the mounting grooves, the contact area between the sealing ring 4 and the lower case 1 and the lid 2 is larger, resulting in a better sealing effect.

[0072] However, in other specific embodiments, the mounting groove may be provided on only one of the lower box body 1 and the box cover 2. Alternatively, when the immersion battery pack is not moving (for example, the battery pack in the authorization announcement No. CN221508299U), the mounting groove may not be provided. In this case, the sealing ring 4 is fixed to the lower box body 1 and the box cover 2 only by the sealing glue diffused out of the annular receiving groove.

[0073] Specific embodiments of the battery pack provided by the utility model:

[0074] Reference Figure 1-6 As shown, the battery pack is an immersed battery pack, which includes a battery case, a battery module installed in the battery case, and an immersion liquid filled in the battery case and immersing the battery module. The battery case is any one of the specific embodiments of the immersed battery case of the present invention, which will not be repeated here.

[0075] Specific embodiments of the electrical equipment provided by the utility model:

[0076] The electrical equipment in this embodiment includes a battery pack, which is a battery pack in a specific embodiment of the battery pack of the present utility model and will not be described in detail here.

[0077] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An immersion battery box, comprising a box cover and a lower box for containing immersion liquid, with a sealing ring installed between the box cover and the lower box, characterized in that: One of the lower box body and the box cover is provided with an annular glue groove for accommodating the sealing glue liquid, and the other is provided with a bonding plane for bonding with the sealing glue liquid, or both the lower box body and the box cover are provided with an annular glue groove for accommodating the sealing glue liquid, and the annular glue grooves on the lower box body and the box cover are connected to each other.

2. The submerged battery box according to claim 1, wherein: The annular rubber groove is located on the outside of the sealing ring.

3. The submerged battery box according to claim 1 or 2, characterized in that: The box cover and / or the lower box body are provided with a glue injection hole communicating with the annular glue groove and the external space of the immersion battery box body.

4. The submerged battery box according to claim 3, wherein: The lower box body is provided with a threaded hole, the box cover is provided with a screw through hole, and the lower box body and the box cover are fixedly connected by screws; the screw through hole is communicated with the annular receiving groove and constitutes the glue injection hole; the threaded hole is a blind hole.

5. The submerged battery box according to claim 4, characterized in that: When an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is not greater than the groove width of the annular plastic groove, and the threaded hole is provided at the groove bottom of the annular plastic groove on the lower box body.

6. The submerged battery box according to claim 4, wherein: When an annular plastic groove is provided on the lower box body, the inner diameter of the threaded hole is larger than the groove width of the annular plastic groove, the annular receiving groove is connected to the threaded hole, and the threaded hole is arranged toward one side of the annular receiving groove.

7. The submerged battery box according to claim 1 or 2, characterized in that: The width of the annular rubber groove becomes narrower as it approaches the bottom of the groove.

8. The submerged battery box according to claim 7, wherein: The annular adhesive groove is a "V"-shaped groove, and the annular adhesive groove includes two inclined groove side walls, and the angles between the groove side walls and the horizontal plane are the same.

9. The submerged battery box according to claim 1 or 2, characterized in that: The box cover and / or the lower box body are provided with an installation groove for installing the sealing ring.

10. A battery pack comprising a battery case, a battery module mounted in the battery case, and an immersion liquid filled in the battery case and immersing the battery module, characterized in that: The battery box is an immersion battery box as described in any one of claims 1 to 9.

11. An electrical device comprising a battery pack, characterized in that: The battery pack is the battery pack according to claim 10.

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