Battery pack lower box, battery pack box and power battery pack

Abstract

The utility model provides a kind of battery pack lower box, battery pack box and power battery pack, belong to battery manufacturing technical field.Battery pack lower box includes box side wall, sealing cover is fixed on box side wall inner surface, sealing cover and box side wall enclose and hold cavity, hold cavity is equipped with moisture-absorbing sheet, sealing cover is equipped with the window for communicating hold cavity and battery pack lower box interior space, sealing cover is pasted with the sealing cover film that window is pre-sealed to be used to keep the closed property of hold cavity in the process of assembling battery module, and is removed before sealing cover battery pack upper box or upper cover, sealing cover film has the pinch portion that pinch is extended outside battery pack lower box to be held by hand.The utility model in moisture-absorbing sheet is set in hold cavity in advance, before sealing cover battery pack upper box or upper cover, only sealing cover film is removed to open moisture-absorbing sheet function, effectively prolongs the storage length after moisture-absorbing sheet assembly, and does not affect the function of moisture-absorbing sheet, and whole assembly process is more convenient.

Description

Technical Field

[0001] This utility model relates to a lower housing of a battery pack, a battery pack housing, and a power battery pack, belonging to the field of battery manufacturing technology. Background Technology

[0002] Currently, common power batteries have moisture-absorbing sheets inside. For example, Chinese utility model patent CN222380691U discloses a power battery pack with anti-condensation effect. The power battery pack includes a battery box and battery modules installed in the battery box. The battery box includes a lower box and a box cover. It mentions that moisture-absorbing sheets are attached to the inner wall of the battery box to absorb water vapor inside and to absorb water droplets flowing from the top cover to both sides, so as to prevent water droplets from accumulating and flowing to the electrical contact parts.

[0003] The aforementioned moisture-absorbing sheet is located within the cavity between the battery module and the battery box, typically bonded to the inner wall of the lower box. Since the moisture-absorbing sheet has a limited exposure time in the environment—if exposed for too long, it will absorb excessive water vapor from the air, thus affecting the moisture-absorbing function after the battery box is sealed—it is generally installed in the final process, before the top cover is assembled. However, the distance between the battery module and the inner wall of the lower box affects the assembly space for the moisture-absorbing sheet. An excessively narrow space makes it difficult to attach and install the sheet, while an excessively large space increases the volume of the battery box, or, given a fixed battery box volume, affects the arrangement space for the battery module. This is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a lower housing for a battery pack, which solves the problem in the prior art where the moisture-absorbing sheet is installed before the top cover of the battery box is assembled. If the assembly operation space between the battery module and the inner wall of the lower housing is too narrow, it will cause inconvenience in installing the moisture-absorbing sheet. If it is too large, it will increase the volume of the battery box or affect the arrangement space of the battery module. The purpose of this utility model is also to provide a battery pack housing and a power battery pack to solve the above problems.

[0005] To achieve the above objectives, the lower housing of the battery pack in this utility model adopts the following technical solution: A battery pack lower housing includes a housing side wall, a sealing cover fixed on the inner surface of the housing side wall, the sealing cover and the housing side wall together forming a receiving cavity, an opened moisture-absorbing sheet is provided in the receiving cavity, the sealing cover is provided with a window for communicating with the receiving cavity and the internal space of the battery pack lower housing, and a sealing film is pasted on the sealing cover to pre-seal the window to maintain the sealing of the receiving cavity during the assembly of the battery module and to be peeled off before sealing the upper housing or top cover of the battery pack, the sealing film has a gripping part that extends out of the battery pack lower housing for hand gripping.

[0006] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, providing a battery pack lower housing that differs from existing technologies. During the assembly of the battery module into the lower housing, the sealing film maintains the airtightness of the accommodating cavity, preventing the moisture-absorbing sheet from absorbing excessive moisture from the air and ensuring subsequent performance. After the battery module is assembled, before sealing the upper housing or top cover of the battery pack, the sealing film can be removed, allowing the window to connect the accommodating cavity and the internal space of the lower housing, thus facilitating the function of the moisture-absorbing sheet. Furthermore, the sealing film has a gripping part that extends beyond the lower housing for easy handling by hand, making it convenient to remove.

[0007] After the battery pack lower casing of this utility model is adopted, the moisture-absorbing sheet is pre-set in the accommodating cavity formed by the sealing cover and the side wall of the casing. The window on the sealing cover is pre-sealed by the sealing film. Before assembling the battery module and sealing the upper casing or top cover of the battery pack, the moisture-absorbing sheet function can be activated simply by removing the sealing film. This effectively extends the storage time of the moisture-absorbing sheet after assembly without affecting its function. At the same time, the entire assembly process is more convenient, eliminating the need to reserve more manual operation space between the battery module and the side wall of the casing, and does not increase the volume of the battery box or affect the arrangement space of the battery module.

[0008] Furthermore, the side wall of the box is formed with an installation groove that matches the moisture-absorbing sheet, so that the moisture-absorbing sheet is first fixed in the installation groove, and then the sealing cover is fixed on the inner surface of the side wall of the box.

[0009] Furthermore, the depth of the mounting groove is less than the thickness of the moisture-absorbing sheet, and the sealing cover includes a cover plate and cover edges connected around the cover plate. The cover plate and the cover edges around the cover plate form a receiving groove, and the receiving groove and the mounting groove together form the receiving cavity.

[0010] Furthermore, the top of the side wall of the box is provided with an inner extension edge extending toward the inside of the box, and the horizontal distance between the end face of the inner extension edge and the inner surface of the side wall of the box is greater than the thickness of the sealing cover.

[0011] Furthermore, the depth of the mounting groove is greater than or equal to the thickness of the moisture-absorbing sheet, the sealing cover is flat, and the sealing cover is fixed to the inner surface of the side wall of the box. The sealing cover and the mounting groove together form the receiving cavity.

[0012] Furthermore, the sealing cover is an insulating partition in the battery pack housing that was originally used to separate the side walls of the housing from the internal electrical components.

[0013] Furthermore, the lower housing of the battery pack includes a rectangular base plate, and two side walls of the housing are fixed to the two ends of the base plate along its length. The window is a vertically extending strip window, and the sealing film is L-shaped, including a vertically connected vertical section and a horizontal section. The vertical section seals the strip window, and the horizontal section extends outward and has the aforementioned pinching part at its end.

[0014] Furthermore, the window is a horizontally extending strip window, and the sealing film is L-shaped, including a vertically connected vertical segment and a horizontal segment. The horizontal segment seals the strip window, and the vertical segment extends upward and has the pinching part at its end.

[0015] To achieve the above objectives, the battery pack housing of this utility model adopts the following technical solution: A battery pack housing includes a lower housing and an upper housing or a top cover. The lower housing includes a housing side wall, and a sealing cover is fixed on the inner surface of the housing side wall. The sealing cover and the housing side wall together form a receiving cavity. An opened moisture-absorbing sheet is provided in the receiving cavity. The sealing cover has a window for communicating with the receiving cavity and the internal space of the lower housing. A sealing film is pasted on the sealing cover to pre-seal the window to maintain the sealing of the receiving cavity during the assembly of the battery module and to be removed before sealing the upper housing or top cover of the battery pack. The sealing film has a gripping part that extends out of the lower housing for hand gripping.

[0016] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention. During the assembly of the battery module into the lower housing, the sealing film maintains the airtightness of the accommodating cavity, preventing the moisture-absorbing sheet from absorbing too much moisture from the air and ensuring subsequent performance. After the battery module is assembled, before sealing the upper housing or top cover of the battery pack, the sealing film can be removed, allowing the window to connect the accommodating cavity and the internal space of the lower housing, thus facilitating the function of the moisture-absorbing sheet. Furthermore, the sealing film has a gripping part that extends beyond the lower housing for easy handling by hand, making it convenient to remove the sealing film.

[0017] After adopting the lower housing of this utility model, the moisture-absorbing sheet is pre-set in the accommodating cavity formed by the sealing cover and the side wall of the housing, and the window on the sealing cover is pre-sealed by the sealing film. Before assembling the battery module and sealing the upper housing or the top cover of the battery pack, the moisture-absorbing sheet function can be turned on simply by removing the sealing film. This effectively extends the storage time of the moisture-absorbing sheet after assembly without affecting its function. At the same time, the entire assembly process is more convenient, without needing to reserve more manual operation space between the battery module and the side wall of the housing, and without increasing the volume of the battery box or affecting the arrangement space of the battery module.

[0018] Furthermore, the side wall of the box is formed with an installation groove that matches the moisture-absorbing sheet, so that the moisture-absorbing sheet is first fixed in the installation groove, and then the sealing cover is fixed on the inner surface of the side wall of the box.

[0019] Furthermore, the depth of the mounting groove is less than the thickness of the moisture-absorbing sheet, and the sealing cover includes a cover plate and cover edges connected around the cover plate. The cover plate and the cover edges around the cover plate form a receiving groove, and the receiving groove and the mounting groove together form the receiving cavity.

[0020] Furthermore, the top of the side wall of the box is provided with an inner extension edge extending toward the inside of the box, and the horizontal distance between the end face of the inner extension edge and the inner surface of the side wall of the box is greater than the thickness of the sealing cover.

[0021] Furthermore, the depth of the mounting groove is greater than or equal to the thickness of the moisture-absorbing sheet, the sealing cover is flat, and the sealing cover is fixed to the inner surface of the side wall of the box. The sealing cover and the mounting groove together form the receiving cavity.

[0022] Furthermore, the sealing cover is an insulating partition in the battery pack housing that was originally used to separate the side walls of the housing from the internal electrical components.

[0023] Furthermore, the lower box body includes a rectangular base plate, and the box body has two side walls that are respectively fixed to both ends of the base plate along its length. The window is a vertically extending strip window, and the sealing film is L-shaped, including a vertically connected vertical section and a horizontal section. The vertical section seals the strip window, and the horizontal section extends outward and has the aforementioned pinching part at its end.

[0024] Furthermore, the window is a horizontally extending strip window, and the sealing film is L-shaped, including a vertically connected vertical segment and a horizontal segment. The horizontal segment seals the strip window, and the vertical segment extends upward and has the pinching part at its end.

[0025] To achieve the above objectives, the power battery pack of this utility model adopts the following technical solution: A power battery pack includes a battery pack housing and battery modules installed in the battery pack housing. The battery pack housing includes a lower housing and an upper housing or a top cover. The lower housing includes a housing side wall, and a sealing cover is fixed on the inner surface of the housing side wall. The sealing cover and the housing side wall together form a receiving cavity. An opened moisture-absorbing sheet is provided in the receiving cavity. The sealing cover has a window for communicating with the receiving cavity and the internal space of the lower housing. A sealing film is pasted on the sealing cover to pre-seal the window to maintain the sealing of the receiving cavity during the assembly of the battery modules and to be peeled off before sealing the upper housing or top cover of the battery pack. The sealing film has a gripping part that extends out of the lower housing for hand gripping.

[0026] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention. During the assembly of the battery module into the lower housing, the sealing film maintains the airtightness of the accommodating cavity, preventing the moisture-absorbing sheet from absorbing too much moisture from the air and ensuring subsequent performance. After the battery module is assembled, before sealing the upper housing or top cover of the battery pack, the sealing film can be removed, allowing the window to connect the accommodating cavity and the internal space of the lower housing, thus facilitating the function of the moisture-absorbing sheet. Furthermore, the sealing film has a gripping part that extends beyond the lower housing for easy handling by hand, making it convenient to remove the sealing film.

[0027] After adopting the lower housing of this utility model, the moisture-absorbing sheet is pre-set in the accommodating cavity formed by the sealing cover and the side wall of the housing, and the window on the sealing cover is pre-sealed by the sealing film. Before assembling the battery module and sealing the upper housing or the top cover of the battery pack, the moisture-absorbing sheet function can be turned on simply by removing the sealing film. This effectively extends the storage time of the moisture-absorbing sheet after assembly without affecting its function. At the same time, the entire assembly process is more convenient, without needing to reserve more manual operation space between the battery module and the side wall of the housing, and without increasing the volume of the battery box or affecting the arrangement space of the battery module.

[0028] Furthermore, the side wall of the box is formed with an installation groove that matches the moisture-absorbing sheet, so that the moisture-absorbing sheet is first fixed in the installation groove, and then the sealing cover is fixed on the inner surface of the side wall of the box.

[0029] Furthermore, the depth of the mounting groove is less than the thickness of the moisture-absorbing sheet, and the sealing cover includes a cover plate and cover edges connected around the cover plate. The cover plate and the cover edges around the cover plate form a receiving groove, and the receiving groove and the mounting groove together form the receiving cavity.

[0030] Furthermore, the top of the side wall of the box is provided with an inner extension edge extending toward the inside of the box, and the horizontal distance between the end face of the inner extension edge and the inner surface of the side wall of the box is greater than the thickness of the sealing cover.

[0031] Furthermore, the depth of the mounting groove is greater than or equal to the thickness of the moisture-absorbing sheet, the sealing cover is flat, and the sealing cover is fixed to the inner surface of the side wall of the box. The sealing cover and the mounting groove together form the receiving cavity.

[0032] Furthermore, the sealing cover is an insulating partition in the battery pack housing that was originally used to separate the side walls of the housing from the internal electrical components.

[0033] Furthermore, the lower box body includes a rectangular base plate, and the box body has two side walls that are respectively fixed to both ends of the base plate along its length. The window is a vertically extending strip window, and the sealing film is L-shaped, including a vertically connected vertical section and a horizontal section. The vertical section seals the strip window, and the horizontal section extends outward and has the aforementioned pinching part at its end.

[0034] Furthermore, the window is a horizontally extending strip window, and the sealing film is L-shaped, including a vertically connected vertical segment and a horizontal segment. The horizontal segment seals the strip window, and the vertical segment extends upward and has the pinching part at its end. Attached Figure Description

[0035] Figure 1 This is an exploded perspective view of Embodiment 1 of the battery pack lower housing in this utility model; Figure 2 This is a side sectional view of Embodiment 1 of the lower housing of the battery pack in this utility model (the moisture-absorbing sheet and sealing cover are not shown). Figure 3 This is a partial side view of Embodiment 1 of the lower housing of the battery pack in this utility model; Figure 4 This is a partial front sectional view of Embodiment 1 of the battery pack lower casing of this utility model (the moisture-absorbing sheet and sealing cover are not shown in the sectional view). Figure 5 This is an exploded perspective view of Embodiment 2 of the lower housing of the battery pack in this utility model.

[0036] In the diagram: 1. Base plate; 2. Box side wall; 21. Mounting groove; 3. Moisture-absorbing sheet; 4. Sealing cover; 41. Window; 5. Sealing film; 51. Vertical section; 52. Horizontal section; 6. Inner extension edge; 7. Insulating partition; 71. Window; 72. Buckle. Detailed Implementation

[0037] To address the technical problems existing in the prior art, the basic concept of this utility model is to pre-install the moisture-absorbing sheet on the side wall of the lower housing of the battery pack, and cover the moisture-absorbing sheet with a sealing cover to form a housing cavity for the moisture-absorbing sheet. The window on the sealing cover is temporarily blocked by a sealing film, so that the housing cavity is kept sealed during the assembly of the battery module, preventing the moisture-absorbing sheet from absorbing too much moisture from the air. Before the battery module is assembled and the upper housing or top cover of the battery pack is sealed, the sealing film is removed, so that the window connects the housing cavity and the internal space of the lower housing of the battery pack, allowing the moisture-absorbing sheet to function normally.

[0038] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0039] The embodiment of the lower housing of the battery pack in this utility model: like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the lower housing of the battery pack includes a base plate 1 and housing side walls 2 fixedly connected to the base plate 1. In this embodiment, the base plate 1 is rectangular, and there are two housing side walls 2, which are respectively fixed at both ends of the base plate 1 along its length. In other embodiments, there may be four housing side walls 2, which are respectively fixed around the base plate 1.

[0040] A sealing cover 4 is fixed on the inner surface of one or more side walls 2 of the housing. The sealing cover 4 and the side wall 2 of the housing together form a receiving cavity. An opened moisture-absorbing sheet 3 is provided in the receiving cavity. In this way, the moisture-absorbing sheet 3 is pre-installed on the lower housing of the battery pack. After the battery module is assembled, before the upper housing or top cover of the battery pack is sealed, there is no need to install the moisture-absorbing sheet 3.

[0041] like Figure 1 and Figure 3As shown, the sealing cover 4 has a window 41 for connecting the accommodating cavity and the internal space of the lower battery pack housing. A sealing film 5 is affixed to the sealing cover 4 to pre-seal the window 41. During the assembly of the battery module into the lower battery pack housing, the sealing film 5 maintains the airtightness of the accommodating cavity, preventing the moisture-absorbing sheet 3 from absorbing excessive moisture from the air and ensuring subsequent performance. After the battery module is assembled, before sealing the upper battery pack housing or the top cover, the sealing film 5 can be removed, allowing the window 41 to connect the accommodating cavity and the internal space of the lower battery pack housing, thus activating the function of the moisture-absorbing sheet 3. Furthermore, the sealing film 5 has a gripping part that extends beyond the lower battery pack housing for easy removal by hand.

[0042] Therefore, after adopting the lower housing of the battery pack of this utility model, the moisture-absorbing sheet 3 is pre-set in the accommodating cavity formed by the sealing cover 4 and the side wall 2 of the housing, and the window 41 on the sealing cover 4 is pre-sealed by the sealing film 5. Before assembling the battery module and sealing the upper housing or the top cover of the battery pack, the moisture-absorbing sheet function can be turned on simply by removing the sealing film 5. This effectively extends the storage time of the moisture-absorbing sheet 3 after assembly without affecting its function. At the same time, the entire assembly process is more convenient, without needing to reserve more space for manual operation between the battery module and the side wall 2 of the housing, and without increasing the volume of the battery box or affecting the arrangement space of the battery module.

[0043] Furthermore, such as Figure 1 and Figure 2 As shown, the side wall 2 of the housing has a mounting groove 21 formed to fit the moisture-absorbing sheet 3. The moisture-absorbing sheet 3 is usually rectangular, so the mounting groove 21 is a rectangular groove. The specific dimensions of the mounting groove 21 are based on the dimensions of the moisture-absorbing sheet 3, with one side being 3-5mm larger than the moisture-absorbing sheet 3 to facilitate the insertion of the moisture-absorbing sheet 3. During installation, the moisture-absorbing sheet 3 is first fixed into the mounting groove 21, which holds the moisture-absorbing sheet 3 in place. Then, the sealing cover 4 is fixed to the inner surface of the side wall 2 of the housing, which facilitates the installation of the moisture-absorbing sheet 3 and the sealing cover 4 and ensures the stability of the moisture-absorbing sheet 3.

[0044] The moisture-absorbing sheet 3 can be fixed by adhesive. For moisture-absorbing sheets 3 with built-in double-sided adhesive, simply peel off the protective film to adhere and fix it to the bottom wall of the mounting groove 21. For moisture-absorbing sheets 3 without double-sided adhesive, additional adhesive can be applied to the moisture-absorbing sheet 3 to adhere and fix it to the bottom wall of the mounting groove 21. Of course, for moisture-absorbing sheets 3 without double-sided adhesive, they can also be fixed in the mounting groove 21 by screws or clips.

[0045] In this embodiment, the depth of the mounting groove 21 is less than the thickness of the moisture-absorbing sheet 3, so the moisture-absorbing sheet 3 will protrude from the mounting groove 21. The sealing cover 4 in this embodiment includes a cover plate and cover edges connected around the cover plate. The cover plate and the cover edges around the cover plate form a receiving groove. The receiving groove and the mounting groove together form the aforementioned receiving cavity to realize the receiving arrangement of the moisture-absorbing sheet 3.

[0046] In other embodiments, when the depth of the receiving groove formed by the sealing cover 4 is large enough, greater than or equal to the thickness of the moisture-absorbing sheet 3, the moisture-absorbing sheet 3 can be fixed first (the specific fixing method is the same as above) or placed in the receiving groove of the sealing cover 4, and then the sealing cover 4 can be fixed to the inner surface of the side wall 2 of the box body. At this time, the mounting groove 21 does not need to be formed on the inner surface of the side wall 2 of the box body.

[0047] Of course, in other embodiments, even if the depth of the receiving groove formed by the sealing cover 4 is greater than or equal to the thickness of the moisture-absorbing sheet 3, and the mounting groove 21 is no longer formed on the inner surface of the box side wall 2, the moisture-absorbing sheet 3 can be fixed to the inner surface of the box side wall 2 first (the specific fixing method is the same as above), and then the sealing cover 4 can be fixed to the inner surface of the box side wall 2, and the sealing cover 4 can cover the moisture-absorbing sheet 3.

[0048] The sealing cap 4 can be fixed by bonding, welding, snap-fit ​​connection or screw connection. When screw connection is used, an outwardly extending flange is also required at the end of the cap edge to allow the screw to pass through.

[0049] like Figure 4 As shown, the top of the side wall 2 of the enclosure has an inner extension edge 6 extending into the enclosure. The horizontal distance between the end face of the inner extension edge 6 and the inner surface of the side wall 2 is greater than the thickness of the sealing cover 4, and the horizontal distance is preferably 8~10mm. The end face of the inner extension edge 6 is the reference surface for installing other components. This avoids the sealing cover 4 protruding from the vertical surface where the end face of the inner extension edge 6 is located, thus preventing it from affecting the positioning of other components. In addition, it meets functional requirements while minimizing the required layout dimensions.

[0050] In other embodiments, without affecting other components, the horizontal distance between the end face of the inner extension 6 and the inner surface of the side wall 2 of the housing can also be equal to or less than the thickness of the sealing cover 4, and the sealing cover 4 protrudes from the vertical surface where the end face of the inner extension 6 is located.

[0051] Of course, the top of the side wall 2 of the enclosure is also provided with an outer extension edge extending outward toward the outside of the enclosure. The outer extension edge and the inner extension edge 6 are integrally connected and can be integrally formed with the side wall 2 of the enclosure, or they can be separately fixed to the top of the side wall 2 of the enclosure. In other embodiments, the top of the side wall 2 of the enclosure may not be provided with an inner extension edge 6. In this case, the thickness of the sealing cover 4 is sufficient to accommodate the moisture-absorbing sheet 3 in the cavity. The thickness should not be too large to avoid affecting the layout space of other components inside the enclosure.

[0052] Furthermore, such as Figure 1 and Figure 3 As shown, the window 41 is a vertically extending strip window, which facilitates the removal of the sealing film 5. The area of ​​the window is preferably greater than or equal to 600 mm², and the specific size is preferably 10 mm × 60 mm. Of course, in other embodiments, the window size can be adjusted according to the specific specifications of the moisture-absorbing sheet 3.

[0053] like Figure 3 As shown, the sealing film 5 is L-shaped, including a vertically connected vertical section 51 and a horizontal section 52. The vertical section 51 covers the strip window, and the horizontal section 52 extends outward and has the aforementioned pinching part at the end. This form is perfectly adapted to the structure of the lower box of the battery pack, because the lower box of the battery pack only includes two box side walls 2, which facilitates the horizontal section 52 to extend outward horizontally.

[0054] And as Figures 1-3 As shown, in this embodiment, the mounting groove 21 is located at the bottom edge of the side wall 2 of the box, which can reduce the extension length of the horizontal section 52, not only saving costs, but also making it easy to tear off the sealing film 5.

[0055] In other embodiments, the mounting groove 21 may also be located at the bottom middle, the top middle, the top edge, or the center of the side wall 2 of the box. Regardless of the location of the mounting groove 21, the sealing film 5 includes a vertical section 51 and a horizontal section 52. The vertical section 51 covers the strip window, and the horizontal section 52 extends outward and has the aforementioned pinching part at its end.

[0056] In other embodiments, window 41 can also be a horizontally extending strip window. In this case, the sealing film 5 is strip-shaped, partially covering the strip window and partially extending horizontally outward to the outside of the battery pack housing.

[0057] In other embodiments, window 41 can also be a circular window or a square window. In this case, regardless of the location of the mounting slot 21, the sealing film 5 can include a circular segment and a strip segment connected to the circular segment, or it can include a square segment and a strip segment connected to the square segment. The circular segment or the square segment covers the circular window or the square window, and the strip segment extends beyond the lower casing of the battery pack. The strip segment can extend horizontally outward or vertically upward.

[0058] In other embodiments, the sealing cover 4 can be flat. In this case, the depth of the mounting groove 21 needs to be greater than or equal to the thickness of the moisture-absorbing sheet 3. The moisture-absorbing sheet 3 needs to be fixed into the mounting groove 21 first, and then the sealing cover 4 is fixed to the inner surface of the side wall 2 of the box. At this time, the sealing cover 4 is attached and fixed to the inner surface of the side wall 2 of the box. The sealing cover 4 and the mounting groove 21 together form the above-mentioned accommodating cavity.

[0059] For example Figure 5 The battery pack lower housing shown in Embodiment 2 has a sealing cover that is an insulating partition 7 that was originally used to separate the side wall 2 of the housing from the internal electrical components. The insulating partition 7 is fixed to the side wall 2 of the housing by a buckle 72, and together with the mounting groove 21 on the side wall 2 of the housing, it forms a cavity for accommodating the moisture-absorbing sheet 3. In this case, there is no need to make an additional sealing cover, which can save the number of parts, reduce costs, and facilitate assembly operations.

[0060] In this embodiment, the mounting groove 21 is formed by a ring of protrusions on the side wall 2 of the box, and the insulating partition 7 is attached to the end face of the protrusion. In other embodiments, the mounting groove 21 can also be formed by a local recess on the side wall 2 of the box with a certain wall thickness, in which case the insulating partition 7 is attached to the inner surface of the side wall 2 of the box.

[0061] In this embodiment, the insulating partition 7 is elongated and fixed to the upper part of the side wall 2 of the housing. The window 71 on the insulating partition 7 for connecting the accommodating cavity and the internal space of the lower housing of the battery pack is a horizontally extending strip window. The sealing film is still L-shaped, including a vertically connected vertical section and a horizontal section. The horizontal section seals the strip window, and the vertical section extends upward and has the aforementioned pinching part at its end.

[0062] Furthermore, in this embodiment, the mounting groove 21 is located in the upper middle of the side wall 2 of the housing, resulting in a shorter vertical section of the sealing film, which saves costs and makes it easier to remove the sealing film. Of course, in other embodiments, the mounting groove 21 can also be located in the bottom middle, bottom edge, upper edge, or center of the side wall 2 of the housing. Regardless of the location of the mounting groove 21, the sealing film includes a vertical section and a horizontal section. The horizontal section covers the strip window, and the vertical section extends upwards to the outside of the lower housing of the battery pack.

[0063] In other embodiments, window 71 can also be a vertically extending strip window. In this case, the sealing film is strip-shaped, part of which covers the strip window and part of which extends vertically upward to the outside of the battery pack housing.

[0064] In other embodiments, window 71 can also be a circular window or a square window. In this case, regardless of the location of the mounting slot 21, the sealing film can include a circular segment and a strip segment connected to the circular segment, or it can include a square segment and a strip segment connected to the square segment. The circular segment or the square segment covers the circular window or the square window, and the strip segment extends beyond the lower casing of the battery pack. The strip segment can extend horizontally outward or vertically upward.

[0065] In other embodiments, the sealing cover may not be the insulating partition originally used to separate the side wall of the battery pack housing from the internal electrical components, but rather a separately manufactured flat plate that is fixed to the side wall of the housing.

[0066] The implementation of the battery pack housing in this utility model is as follows: the battery pack housing includes a lower housing and an upper housing or a top cover. The specific structure of the lower housing is the same as the implementation of the lower housing of the battery pack described above, and will not be repeated here.

[0067] The implementation method of the power battery pack in this utility model is as follows: the power battery pack includes a battery pack housing and battery modules installed in the battery pack housing. The battery pack housing includes a lower housing and an upper housing or a top cover. The specific structure of the lower housing is the same as the implementation method of the lower housing of the battery pack described above, and will not be repeated here.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A battery pack lower case comprising a case side wall, characterized by, The inner surface of the side wall of the box body is fixed with a sealing cover, the sealing cover and the side wall of the box body jointly enclose a containing cavity, the containing cavity is provided with an unsealed moisture absorption sheet, the sealing cover is provided with a window for communicating the containing cavity and the internal space of the lower box body of the battery pack, and a sealing cover film is attached to the sealing cover to preseal the window for maintaining the sealing of the containing cavity during assembly of the battery module and to be removed before sealing the upper box body or the upper cover of the battery pack, the sealing cover film has a pinch portion extending out of the lower box body of the battery pack for manual pinching.

2. The battery pack lower case according to claim 1, characterized by, The side wall of the box body is formed with a mounting groove matched with the moisture absorption sheet, so that the moisture absorption sheet is first fixed in the mounting groove, and then the sealing cover is fixed on the inner surface of the side wall of the box body.

3. The battery pack lower case according to claim 2, characterized by, The groove depth of the mounting groove is less than the thickness of the moisture absorption sheet, the sealing cover includes a cover plate and a cover edge connected around the cover plate, the cover plate and the cover edge around the cover plate enclose a containing groove, and the containing groove and the mounting groove jointly enclose the containing cavity.

4. The battery pack lower case according to claim 3, characterized by, The top end of the side wall of the box body is provided with an inner extension edge extending towards the inside of the box body, and the horizontal distance between the end surface of the inner extension edge and the inner surface of the side wall of the box body is greater than the thickness of the sealing cover.

5. The battery pack lower case according to claim 2, characterized by, The groove depth of the mounting groove is greater than or equal to the thickness of the moisture absorption sheet, the sealing cover is a flat plate, the sealing cover is fixedly attached to the inner surface of the side wall of the box body, and the sealing cover and the mounting groove jointly enclose the containing cavity.

6. The battery pack lower case according to claim 5, characterized by, The sealing cover is an insulating partition plate originally used in the box body of the battery pack to separate the side wall of the box body and the internal electrical devices.

7. The battery pack lower case according to any one of claims 1 to 6, characterized by a battery pack The lower box body includes a rectangular bottom plate, the side wall of the box body has two and is fixed at both ends of the length direction of the bottom plate, the window is a vertically extending strip-shaped window, and the sealing cover film is L-shaped and includes a vertical segment and a horizontal segment connected perpendicularly, the vertical segment seals the strip-shaped window, and the horizontal segment extends outward and has the pinch portion at the end.

8. The battery pack lower case according to any one of claims 1 to 6, characterized by, The window is a horizontally extending strip-shaped window, the sealing cover film is L-shaped and includes a vertical segment and a horizontal segment connected perpendicularly, the horizontal segment seals the strip-shaped window, and the vertical segment extends upward and has the pinch portion at the end.

9. A battery pack case comprising a lower case, further comprising an upper case or an upper cover, characterized in that, The lower box body is the lower box body of the battery pack according to any one of claims 1-8.

10. A power battery pack comprising a battery pack case and a battery module installed in the battery pack case, the battery pack case comprising a lower case, further comprising an upper case or an upper cover, characterized in that, The lower box body is the lower box body of the battery pack according to any one of claims 1-8.

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