Box and battery cell module with same

Abstract

A box and a battery cell module with same. The box is configured to store a battery cell, and the box comprises: a housing (10), wherein the housing (10) is provided with an accommodating cavity (11), a maintenance hole (12) is provided in the top of the housing (10), the maintenance hole (12) is in communication with the accommodating cavity (11), the accommodating cavity (11) is configured to store the battery cell, and the maintenance hole (12) is configured to correspond to the battery cell; and an upper cover (20) which is detachably arranged on the housing (10), wherein the upper cover (20) can cover the maintenance hole (12). Therefore, the problem of it being impossible to maintain a liquid cooling PACK and a battery cell module due to potting and adhesive bonding between a box lid and a box body is solved.

Description

Box and battery module having the same

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 21, 2023, with application number 202323506026.7 and invention name “Box and battery cell module having the same”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of battery cell modules, and in particular to a box and a battery cell module having the same. Background Art

[0003] The liquid-cooling pack and battery module form an energy storage structure. In existing technology, these typically consist of a cover and a housing, with the cells housed within. The cover and housing are secured together through potting, gluing, or other methods. However, this arrangement prevents the cover from being opened. If a malfunction occurs in the liquid-cooling pack or battery module, the cells within the housing cannot be repaired, making the system inoperable. Summary of the Invention

[0004] The present application discloses a box body and a battery cell module having the same, so as to solve the problem in the prior art that the box cover and the box body are connected by potting and gluing solutions, resulting in the liquid cooling PACK and the battery cell module being unmaintainable.

[0005] According to one aspect of the present application, a box is disclosed, which is used to store battery cells. The box includes: a shell having a receiving cavity, a maintenance hole provided on the top of the shell, the maintenance hole being connected to the receiving cavity, the receiving cavity being used to store the battery cells, and the maintenance hole being provided corresponding to the battery cells; and an upper cover detachably provided on the shell, the upper cover being capable of covering the maintenance hole;

[0006] Furthermore, a sealing glue groove is provided between the shell and the upper cover, and sealing glue is provided in the sealing glue groove to seal the shell and the upper cover.

[0007] Furthermore, a limiting protrusion is provided on the top of the shell, the bottom surface of the upper cover abuts against the limiting protrusion, and a sealing glue groove is provided between the shell and the upper cover.

[0008] Furthermore, the sealant groove is arranged along the circumference of the shell, and the sealant groove is arranged along the circumference of the upper cover.

[0009] Furthermore, a snap-fit ​​structure is provided between the shell and the upper cover, and the shell is detachably connected to the upper cover via the snap-fit ​​structure.

[0010] Furthermore, a through hole is provided on the top of the shell, a connecting rod is provided on the upper cover, and a protrusion is provided on the end of the connecting rod away from the upper cover. When the upper cover is fixed on the shell, the connecting rod is passed through the through hole, the protrusion abuts against the inner wall of the top of the shell, and the through hole and the connecting rod cooperate to form a snap-fit ​​structure.

[0011] Furthermore, there is a gap between the through hole and the connecting rod.

[0012] Furthermore, a first inclined surface is provided at the bottom of the raised portion, and the first inclined surface gradually approaches the center line of the connecting rod in the direction away from the upper cover. A second inclined surface is provided on the inner wall of the through hole, and the second inclined surface gradually moves away from the center line of the through hole in the direction approaching the upper cover. The first inclined surface and the second inclined surface are provided correspondingly, and the first inclined surface and the second inclined surface cooperate to form a guiding structure.

[0013] Furthermore, the raised portion is in a strip shape, or the raised portion is in a ring shape.

[0014] Furthermore, the housing and the upper cover are detachably connected via threaded fasteners;

[0015] Alternatively, the shell and the upper cover are detachably connected by ultrasonic spot welding;

[0016] Alternatively, one of the shell and the upper cover is provided with a connecting piece, and the other is provided with a connecting hole, and the connecting piece and the connecting hole are detachably matched.

[0017] Furthermore, the box body also includes two end covers, which are respectively arranged at both ends of the shell, and the end covers are fixedly connected to the shell.

[0018] Furthermore, a potting groove is provided between the end of the shell and the end cover, and potting glue is filled in the potting groove, and the shell is bonded to the end cover through the potting glue.

[0019] Furthermore, an airtightness detection structure is provided on the shell and / or the upper cover.

[0020] Furthermore, the shell includes a top plate and two side plates, the two side plates are respectively arranged on both sides of the top plate, a plurality of maintenance holes are arranged on the top plate, and a plurality of snap-fit ​​structures are provided between the top plate and the upper cover.

[0021] Furthermore, a plurality of reinforcing ribs are provided on the top plate, the spaces between adjacent reinforcing ribs form the maintenance holes, and a plurality of snap-fit ​​structures are provided between the reinforcing ribs and the upper cover.

[0022] Furthermore, the maintenance holes are provided corresponding to the welding points of the battery cells.

[0023] According to another aspect of the present application, a battery cell module is disclosed. The battery cell module includes a battery cell, a liquid cooling plate, and the box disclosed above. The battery cell is arranged in the box, and the box is fixed on the liquid cooling plate.

[0024] Applying the technical solution of the present application, the battery cell is located in the accommodating cavity of the shell, and a maintenance hole is provided on the top of the shell, and the upper cover is detachably provided on the shell. With the above structure, during normal operation, the upper cover can block the maintenance hole to prevent external impurities from entering the accommodating cavity, and at the same time, it can also prevent the staff from accidentally touching the battery cell and getting hurt; when the battery cell is damaged and needs repair, the staff can remove the upper cover and repair the battery cell's pole piece or the communication line between the battery cells and other structures through the maintenance hole. Such a setting can make the liquid-cooled PACK and the battery cell module maintainable, facilitate the maintenance of the liquid-cooled PACK and the battery cell module, increase the service life of the liquid-cooled PACK and the battery cell module, and reduce unnecessary waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0026] FIG1 shows an exploded view of the housing and the upper cover provided by the present application;

[0027] FIG2 shows a partial enlarged view of point A in FIG1 ;

[0028] Figure 3 shows a schematic structural diagram of the housing and the end cover;

[0029] FIG4 shows a schematic structural diagram of a buckle structure provided by the present application;

[0030] FIG5 shows another schematic structural diagram of the buckle structure provided in the present application;

[0031] FIG6 shows a schematic diagram of a structure in which the housing and the upper cover are detachably connected provided by the present application;

[0032] FIG7 shows another schematic diagram of a structure in which the housing and the upper cover are detachably connected provided by the present application;

[0033] FIG8 shows another structural schematic diagram of a detachable connection between a housing and an upper cover provided by the present application;

[0034] FIG9 shows a schematic structural diagram of the housing and the upper cover provided by the present application;

[0035] FIG10 shows a schematic structural diagram of the box provided in this application.

[0036] Among them, the above-mentioned drawings include the following figure marks: 10. Shell; 11. Accommodating cavity; 12. Maintenance hole; 13. Limiting protrusion; 14. Through hole; 141. Second inclined surface; 15. Top plate; 16. Side plate; 17. Reinforcing rib; 18. Potting groove; 19. Threaded hole; 110. Connecting hole; 111. First bonding surface; 20. Upper cover; 21. Connecting rod; 22. Protrusion; 221. First inclined surface; 23. Reinforcement structure; 24. Ultrasonic welding point; 25. Connector; 26. Second bonding surface; 27. Mounting hole; 30. Sealant groove; 40. End cover; 50. Airtightness detection structure; 60. Pre-tightening structure; 70. Threaded fastener; 80. Gap; 90. Snap structure. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] As shown in Figures 1 to 10, an embodiment of the present application provides a box for storing battery cells. The box includes a housing 10 and a top cover 20. Housing 10 has a storage cavity 11. A maintenance hole 12 is provided on the top of housing 10. Maintenance hole 12 is connected to storage cavity 11. Storage cavity 11 is used to store battery cells, and maintenance hole 12 is provided corresponding to the battery cells. Top cover 20 is detachably mounted on housing 10 and can cover maintenance hole 12.

[0039] Applying the technical solution of the present application, the battery cell is located in the accommodating cavity 11 of the shell 10, and a maintenance hole 12 is provided on the top of the shell 10, and the upper cover 20 is detachably provided on the shell 10. With the above structure, during normal operation, the upper cover 20 can block the maintenance hole 12 to prevent external impurities from entering the accommodating cavity 11, and at the same time, it can also prevent the staff from accidentally touching the battery cell and getting hurt; when the battery cell is damaged and needs repair, the staff can remove the upper cover 20 and repair the battery cell's pole piece or the communication line between the battery cells and other structures through the maintenance hole 12. Such a setting can make the liquid-cooled PACK and the battery cell module maintainable, facilitate the repair of the liquid-cooled PACK and the battery cell module, increase the service life of the liquid-cooled PACK and the battery cell module, and reduce unnecessary waste.

[0040] The maintenance holes are located in correspondence with the battery cell's solder points. Specifically, they correspond to the battery cell's terminal solder points, FPC solder points, and other solder points. Since battery cell failures typically occur at solder points, this arrangement makes it easier for staff to repair the faulty areas, further improving maintenance efficiency.

[0041] The upper cover 20 is provided with a reinforcing structure 23 , which can improve the structural strength of the upper cover 20 and avoid damage to the upper cover 20 during the process of disassembling the upper cover 20 , thereby increasing the service life of the upper cover 20 .

[0042] As shown in Figure 4, a sealant (not shown) is provided between the housing 10 and the upper cover 20 to seal the housing 10 and the upper cover 20. This arrangement prevents external air from entering the accommodating cavity 11 through the gap between the upper cover 20 and the housing 10, thereby ensuring a seal between the housing 10 and the upper cover 20. When the upper cover 20 needs to be removed, the sealant can be scraped off with a utility knife.

[0043] A sealant groove 30 is provided between the housing 10 and the upper cover 20. Sealant (not shown) is provided in the sealant groove 30 to seal the housing 10 and the upper cover 20. The sealant groove 30 can be provided on the housing 10, the upper cover 20, or both. This arrangement constrains the position of the sealant and ensures its thickness, facilitating a sealant-tight connection between the housing 10 and the upper cover 20, thereby improving the sealing effect between the housing 10 and the upper cover 20.

[0044] Furthermore, a limiting protrusion 13 is provided on the top of the housing 10, and the bottom surface of the upper cover 20 abuts against the limiting protrusion 13. A sealant groove 30 is provided between the housing 10 and the upper cover 20. This arrangement provides support for the upper cover 20, preventing the upper cover 20 from squeezing the sealant and affecting the sealing effect, ensuring that the sealant has sufficient thickness. It also provides space for workers to remove the sealant when removing the upper cover 20, thus preventing scratches on the upper cover 20 and the housing 10 during the removal process.

[0045] The sealant groove 30 is located around the limiting protrusion 13, or the limiting protrusion 13 is located around the sealant groove 30. To facilitate sealant removal, the sealant groove 30 can be located around the limiting protrusion 13. If the sealant groove 30 is not provided, the limiting protrusion 13 can also be provided. In this case, the sealant is located around the limiting protrusion 13, or the limiting protrusion 13 is located around the sealant. To facilitate sealant removal, the sealant can be located around the limiting protrusion 13.

[0046] Specifically, the top of the housing 10 is provided with a first adhesive surface 111, which is annularly arranged around the outer periphery of the limiting protrusion 13. The bottom surface of the upper cover 20 is provided with a second adhesive surface 26, which is annularly arranged along the edge of the upper cover 20. The first adhesive surface 111 and the second adhesive surface 26 are correspondingly arranged, and the sealant is arranged between the first adhesive surface 111 and the second adhesive surface 26. This arrangement facilitates the provision of sealant between the housing 10 and the upper cover 20.

[0047] When the sealant groove 30 is provided in the housing 10, the first bonding surface 111 can be understood as the inner wall of the sealant groove 30; when the sealant groove 30 is provided in the upper cover 20, the second bonding surface 26 can be understood as the inner wall of the sealant groove 30; when the sealant groove 30 is provided in both the housing 10 and the upper cover 20, the first bonding surface 111 can be understood as the inner wall of the sealant groove 30 on the housing 10, and the second bonding surface 26 can be understood as the inner wall of the sealant groove 30 on the upper cover 20. Based on this, the sealant groove 30 is provided along the circumference of the housing 10, and the sealant groove 30 is provided along the circumference of the upper cover 20. This increases the area of ​​the sealed connection between the upper cover 20 and the housing 10, improving the sealing effect between the upper cover 20 and the housing 10.

[0048] The sealant can also serve to fix the housing 10 and the upper cover 20 .

[0049] Furthermore, a snap-fit ​​structure 90 is provided between the housing 10 and the upper cover 20, allowing the housing 10 to be detachably connected to the upper cover 20 via the snap-fit ​​structure 90. This arrangement facilitates disassembly between the housing 10 and the upper cover 20, simplifies the structure, and avoids the need for threaded holes or other structures between the housing 10 and the upper cover 20. The snap-fit ​​structure 90, the limiting protrusion 13, and the sealant are sequentially arranged outward from the center of the upper cover 20, facilitating the securement of the upper cover 20 to the housing 10.

[0050] As shown in FIG2 , a through hole 14 is provided on the top of the housing 10, and a connecting rod 21 is provided on the upper cover 20. A protrusion 22 is provided on the end of the connecting rod 21 away from the upper cover 20. When the upper cover 20 is fixed to the housing 10, the connecting rod 21 is inserted into the through hole 14, and the protrusion 22 abuts against the inner wall of the top of the housing 10. The through hole 14 and the connecting rod 21 cooperate to form a snap-fit ​​structure 90. This arrangement has a simple structure and is easy to operate, making it easy to disassemble and assemble the upper cover 20.

[0051] Specifically, a gap 80 is provided between the through hole 14 and the connecting rod 21. For example, the through hole 14 is a circular hole, the connecting rod 21 is a round rod, and the diameter of the through hole 14 is larger than the diameter of the connecting rod 21; or, the through hole 14 is a square hole, the connecting rod 21 is a square rod, and the width of the through hole 14 is larger than the width of the connecting rod 21; or, the through hole 14 is a circular hole, the connecting rod 21 is a square rod, and the diameter of the through hole 14 is larger than the width of the connecting rod 21; or, the through hole 14 is a square hole, the connecting rod 21 is a round rod, and the width of the through hole 14 is larger than the diameter of the connecting rod 21. When the upper cover 20 is fixed to the housing 10, the connecting rod 21 will undergo elastic deformation. With this arrangement, the through hole 14 has sufficient space to accommodate the deformed connecting rod 21, ensuring that the protrusion 22 can smoothly abut against the inner wall of the top of the housing 10.

[0052] Furthermore, a first inclined surface 221 is provided at the bottom of the protrusion 22, and the first inclined surface 221 gradually approaches the center line of the connecting rod 21 in the direction away from the upper cover 20. A second inclined surface 141 is provided on the inner wall of the through hole 14, and the second inclined surface 141 gradually moves away from the center line of the through hole 14 in the direction approaching the upper cover 20. The first inclined surface 221 and the second inclined surface 114 are correspondingly arranged. In this way, the first inclined surface 221 and the second inclined surface 114 cooperate to form a guiding structure, thereby facilitating the connecting rod 21 to pass through the through hole 14.

[0053] As shown in Figure 4, in order to facilitate the assembly of the upper cover 20 and the shell 10, the protrusion 22 is strip-shaped, and the protrusion 22 can be located on one side of the connecting rod 21; as shown in Figure 5, in order to improve the connection stability between the upper cover 20 and the shell 10, the protrusion 22 is annular, and the protrusion 22 is located on the periphery of the connecting rod 21.

[0054] The housing 10 and the upper cover 20 can also be detachably connected using other structures. As shown in Figure 6, the housing 10 and the upper cover 20 are detachably connected using a threaded fastener 70. For example, the housing 10 is provided with a threaded hole 19, and the upper cover 20 is provided with a mounting hole 27. The threaded fastener 70 is a screw that passes through the mounting hole 27 and is located within the threaded hole 19. The threaded fastener 70 and the threaded hole 19 are threadedly engaged.

[0055] The housing 10 and the upper cover 20 are detachably connected by ultrasonic spot welding. Specifically, as shown in FIG7 , there is an ultrasonic welding spot 24 between the housing 10 and the upper cover 20 , and the ultrasonic welding spot 24 detachably connects the housing 10 and the upper cover 20 .

[0056] As shown in FIG8 , one of the housing 10 and the upper cover 20 is provided with a connector 25 and the other is provided with a connecting hole 110 , and the connector 25 and the connecting hole 110 are detachably matched. The connector 25 and the connecting hole 110 may be interference fit or transition fit.

[0057] As shown in Figures 9 and 10, the box body further includes two end caps 40, which are respectively arranged at both ends of the shell 10 and are fixedly connected to the shell 10. This arrangement facilitates assembly between the box body, the end caps 40 and the battery cell, and is easy to operate.

[0058] As shown in Figure 3, a potting groove 18 is provided between the end of the housing 10 and the end cap 40. Potting compound is filled in the potting groove 18, and the housing 10 is bonded to the end cap 40 via the potting compound. This arrangement offers a simple structure and convenient operation, facilitating the securement between the housing 10 and the end cap 40 and eliminating the need for threaded holes and other structural components. Furthermore, if the liquid-cooled pack or battery cell module is damaged by high temperatures, the potting compound melts, allowing the gas within the housing 10 to escape through the gap between the end cap 40 and the housing 10, thereby achieving pressure relief and explosion protection.

[0059] Furthermore, the potting grooves 18 are arranged on the top and both sides of the shell 10 . Such arrangement can ensure the sealing area between the shell 10 and the end cover 40 and ensure the stability of the connection between the shell 10 and the end cover 40 .

[0060] In this application, no sealing ring is required, the use of components is reduced, and assembly is more convenient.

[0061] The housing 10 or the upper cover 20 is provided with an airtightness detection structure 50, or both the housing 10 and the upper cover 20 are provided with an airtightness detection structure 50. In the present application, the housing 10 is provided with an airtightness detection structure 50. The airtightness detection structure 50 can detect the airtightness of the accommodating cavity 11 to prevent gas circulation, and the gas detection structure can also realize pressure relief. The airtightness detection structure 50 can be a self-sealing valve or a pressure relief valve.

[0062] Specifically, the housing 10 includes a top plate 15 and two side plates 16, one on each side of the top plate 15. The top plate 15 is provided with multiple maintenance holes 12, and multiple snap-fit ​​structures are provided between the top plate 15 and the upper cover 20. This arrangement facilitates maintenance of the battery cells while ensuring a stable connection between the top plate 15 and the upper cover 20.

[0063] The position of the connecting rod 21 can be set according to the requirements. Optionally, the connecting rod 21 can be set around the upper cover 20 or in the central area of ​​the upper cover 20. The through hole 14 is corresponding to the connecting rod 21.

[0064] Furthermore, the top plate 15 is provided with a plurality of reinforcing ribs 17, with the spaces between adjacent reinforcing ribs 17 forming maintenance holes 12. This arrangement, while providing reinforcement, allows for the avoidance of welding points for the battery cell electrodes, communication lines, and temperature sensing lines, facilitating cell maintenance. Furthermore, through holes 14 are provided on the reinforcing ribs 17. In this application, the plurality of maintenance holes 12 form a mesh structure.

[0065] In the case where the housing 10 and the upper cover 20 are detachably connected via a plurality of snap structures 90 , a plurality of snap structures 90 may be provided between the reinforcing rib 17 and the upper cover 20 . As described above, the through holes 14 of the snap structures 90 are provided on the reinforcing rib 17 .

[0066] In the case where the housing 10 and the upper cover 20 are detachably connected via the threaded fastener 70 , the threaded hole 19 may be optionally provided on the reinforcing rib 17 .

[0067] In the case where the housing 10 and the upper cover 20 are detachably connected via the connector 25 and the connecting hole 110 , the connecting hole 110 may be optionally provided on the reinforcing rib 17 .

[0068] In the case where the housing 10 and the upper cover 20 are detachably connected via the ultrasonic welds 24 , the ultrasonic welds 24 may be selected to connect the upper cover 20 and the reinforcing ribs 17 .

[0069] The housing 10 can be used for a battery cell module or for an entire PACK.

[0070] Furthermore, the housing also includes a pre-tensioning structure 60, which can be a steel strip. In this application, the housing 10 does not have a bottom plate. During assembly of the cell module, the pre-tensioning structure 60 is first used to secure the multiple cells and two end caps 40, which are placed on either side of the multiple cells. The housing 10 is then inserted between the pre-tensioning structure 60 and the cells. This arrangement facilitates assembly of the cell module and is easy to operate.

[0071] An embodiment of the present application provides a battery cell module, which includes a battery cell, a liquid cooling plate, and the above-mentioned box body, wherein the battery cell is arranged in the box body, and the box body is fixed to the liquid cooling plate. Specifically, the box body is fixed to the liquid cooling plate by fixing glue, and when the battery cell module needs to be moved, the liquid cooling plate can be moved. The box body can also be fixed on a heat sink tray, and the heat of the battery cell module is dissipated by a heat conductive structure. The battery cell module can be used as a PACK. The existing PACK structure size is larger than the battery cell module structure size of the present application. The existing PACK uses a pressure relief valve for pressure relief. The model of the pressure relief valve used in the existing PACK is larger than the pressure relief valve used in the battery cell module of the present application, and the battery cell assembly of the present application can also use a self-sealing valve for airtightness detection. Therefore, the cost of the battery cell module of the present application is lower than that of the existing PACK. The battery cell module of the present application can be directly grouped into an energy storage system, or the battery cell modules can be used to form a PACK and then grouped into an energy storage system. Furthermore, the battery cell module using the box provided above facilitates maintenance of the battery cell module, thereby increasing the service life of the battery cell module and reducing unnecessary waste.

[0072] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0074] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0075] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0076] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0077] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A box for storing battery cells, characterized in that: The box body comprises: A shell (10), the shell (10) having a receiving cavity (11), a maintenance hole (12) being arranged on the top of the shell (10), the maintenance hole (12) being connected to the receiving cavity (11), the receiving cavity (11) being used to store the battery cell, and the maintenance hole (12) being arranged corresponding to the battery cell; An upper cover (20) is detachably arranged on the housing (10), and the upper cover (20) is capable of covering the maintenance hole (12).

2. The box according to claim 1, characterized in that: A sealing adhesive groove (30) is provided between the shell (10) and the upper cover (20), and sealing adhesive is provided in the sealing adhesive groove (30) to seal between the shell (10) and the upper cover (20).

3. The box according to claim 2, characterized in that: A limiting protrusion (13) is provided on the top of the shell (10), the bottom surface of the upper cover (20) is in contact with the limiting protrusion (13), and the sealing glue groove (30) is provided between the shell (10) and the upper cover (20).

4. The box according to claim 2, characterized in that: The sealant groove (30) is arranged along the circumference of the shell (10), and the sealant groove (30) is arranged along the circumference of the upper cover (20).

5. The box according to claim 1, characterized in that: A snap-fit ​​structure is provided between the shell (10) and the upper cover (20), and the shell (10) is detachably connected to the upper cover (20) via the snap-fit ​​structure.

6. The box according to claim 5, characterized in that: A through hole (14) is provided on the top of the shell (10), a connecting rod (21) is provided on the upper cover (20), and a protrusion (22) is provided on one end of the connecting rod (21) away from the upper cover (20). When the upper cover (20) is fixed on the shell (10), the connecting rod (21) is inserted into the through hole (14), the protrusion (22) abuts against the inner wall of the top of the shell (10), and the through hole (14) and the connecting rod (21) cooperate to form the snap-fit ​​structure.

7. The box according to claim 6, characterized in that: A gap (80) is provided between the through hole (14) and the connecting rod (21).

8. The box according to claim 6, characterized in that: A first inclined surface (221) is provided at the bottom of the protruding portion (22), and the first inclined surface (221) gradually approaches the center line of the connecting rod (21) in a direction away from the upper cover (20). A second inclined surface (141) is provided on the inner wall of the through hole (14), and the second inclined surface (141) gradually moves away from the center line of the through hole (14) in a direction close to the upper cover (20). The first inclined surface (221) and the second inclined surface (141) are correspondingly provided, and the first inclined surface (221) and the second inclined surface (141) cooperate to form a guiding structure.

9. The box according to claim 6, characterized in that: The protrusion (22) is in a strip shape, or the protrusion (22) is in a ring shape.

10. The box according to claim 1, characterized in that: The housing (10) and the upper cover (20) are detachably connected via a threaded fastener (70); Alternatively, the shell (10) and the upper cover (20) are detachably connected by ultrasonic spot welding; Alternatively, one of the housing (10) and the upper cover (20) is provided with a connecting piece (25) and the other is provided with a connecting hole (110), and the connecting piece (25) and the connecting hole (110) are detachably matched.

11. The box according to claim 1, characterized in that: The box body further comprises two end covers (40), the two end covers (40) are respectively arranged at two ends of the shell (10), and the end covers (40) are fixedly connected to the shell (10).

12. The box according to claim 11, characterized in that: A potting groove (18) is provided between the end of the shell (10) and the end cover (40), and potting glue is potted in the potting groove (18), and the shell (10) is bonded to the end cover (40) through the potting glue.

13. The box according to claim 1, characterized in that: An airtightness detection structure (50) is provided on the housing (10) and / or the upper cover (20).

14. The box according to claim 5, characterized in that: The shell (10) comprises a top plate (15) and two side plates (16), wherein the two side plates (16) are respectively arranged on both sides of the top plate (15), a plurality of maintenance holes (12) are arranged on the top plate (15), and a plurality of snap-fit ​​structures are provided between the top plate (15) and the upper cover (20).

15. The box according to claim 14, characterized in that: A plurality of reinforcing ribs (17) are provided on the top plate (15), the spaces between adjacent reinforcing ribs (17) form the maintenance holes (12), and a plurality of snap-fit ​​structures (90) are provided between the reinforcing ribs (17) and the upper cover (20).

16. The box according to claim 1, characterized in that: The maintenance hole (12) is arranged corresponding to the welding point of the battery core.

17. A battery cell module, characterized in that: The battery cell module comprises a battery cell, a liquid cooling plate and a box body as described in any one of claims 1 to 16, wherein the battery cell is arranged in the box body, and the box body is fixed on the liquid cooling plate.

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