Battery pack box and battery pack

Abstract

The present invention relates to a battery pack case and a battery pack. The battery pack case includes a bottom plate, side panels and a cover plate. The side panels and the bottom plate form a receiving cavity for receiving battery cells. The side panels are an integrated structure. The bottom plate, side panels and cover plate are separately provided. Sealing gaskets are provided between the bottom plate and the side panels, and between the side panels and the cover plate. The bottom plate, side panels and cover plate are fastened together by fasteners. The battery pack includes the above-mentioned battery pack case and battery cells provided in the battery pack case. The battery pack case and battery pack of the present invention do not require welding during assembly, and the overall assembly process is simple. At the same time, the sealing is good, which can ensure the normal operation of the battery pack.

Description

Technical Field

[0001] The present invention relates to a battery pack case and a battery pack. Background Art

[0002] A battery pack typically consists of a battery case and several battery modules housed within it. Each module is composed of several battery cells connected in series and parallel, secured to the battery case by corresponding structural members. A battery module typically includes end plates and side plates. The end plates primarily serve to resist the expansion force of the battery cells, while the side plates and end plates together position the battery cells.

[0003] Since each battery module is fixed to the battery pack case through corresponding structural parts, on the one hand, a large number of structural parts are used, resulting in a high overall material cost and making the battery pack assembly process more complicated; on the other hand, a large number of structural parts will occupy most of the space in the battery pack case, which is not conducive to improving the energy density of the battery pack; at the same time, in the event of large vibration, the structural parts are prone to loosening, which poses a certain risk to the fixation of the battery modules.

[0004] In response to the above situation, Chinese invention patent application publication number CN109742281A discloses a battery box comprising battery cells and a lower box body. The battery cells are arranged in rows within the lower box body. The lower box body comprises a bottom plate disposed on the ground and side panels, with an opening at the top. A pair of opposing side panels of the lower box body are provided with reinforcing beams. At least one surface of the battery cells proximal to the outside contacts the side panels or reinforcing beams of the lower box body. The side panels or reinforcing beams of the lower box body can support the surface of the battery cells, thereby preventing the surface of the battery cells from arching outward due to the expansion force within the battery cells when thermal runaway occurs. The above-mentioned battery box directly places the battery cells in rows within the lower box body, eliminating the need for heavy module end plates and module side panels. In other words, it eliminates the need for battery modules. This, in turn, reduces the use of structural components, reduces costs, and improves space utilization within the battery box.

[0005] Since the lower box of the battery box is usually formed by welding a bottom plate and four side plates together, on the one hand, the welds need to be inspected after welding, which places high demands on the assembly process of the lower box; on the other hand, the battery box adopts a welding process, and the welds have always been a failure point, affecting the sealing of the battery box. Summary of the Invention

[0006] The purpose of the present invention is to provide a battery pack case to solve the technical problems in the prior art that the assembly process of the battery pack case is high and the sealing is difficult to ensure; the purpose of the present invention is also to provide a battery pack that is simple to assemble and has good sealing.

[0007] To achieve the above objectives, the technical solution of the battery pack box of the present invention is:

[0008] The battery pack box includes a bottom plate, side panels and a cover plate. The side panels and the bottom plate form a receiving cavity for accommodating battery cells.

[0009] The side panel is an integrated structure;

[0010] The bottom plate, side panels and cover plate are separately provided;

[0011] Sealing gaskets are provided between the bottom plate and the side panels, and between the side panels and the cover panel;

[0012] The bottom plate, side panels and cover plate are fastened together by fasteners.

[0013] The battery pack case of the present invention features a separate bottom plate, side panels, and cover plate, which are fastened together using fasteners. The side panels are an integrated structure, simplifying assembly compared to existing technologies. The entire assembly process avoids welding, thus eliminating operations such as weld flaw detection and weld point failure associated with welding. Furthermore, the battery pack case of the present invention features sealing gaskets between the side panels and the bottom plate, and between the side panels and the cover plate. These gaskets ensure the sealing of the battery pack case, thereby ensuring the operational stability of the battery pack.

[0014] Furthermore, the side enclosure includes side frames correspondingly connected to the side edges of the bottom plate, and the side frames and the bottom plate enclose the accommodating cavity;

[0015] The side frame is an inner and outer double-layer structure, including an inner wall, an outer wall and a connecting ear plate connecting the inner wall and the outer wall, and a cavity is formed between the inner wall and the outer wall.

[0016] Beneficial effects: The side frame adopts an inner and outer double-layer structure, and there is a cavity between the inner wall and the outer wall, which can reduce the weight of the side frame, save materials, reduce the cost of the support, and is conducive to the lightweight design of the battery pack.

[0017] Furthermore, the cross section of the sealing gasket is E-shaped and has two embedding openings;

[0018] The upper and lower ends of the inner wall and the outer wall are respectively embedded in the corresponding embedding openings to achieve double sealing of the battery pack box.

[0019] Beneficial effect: The E-shaped sealing gasket can seal the cavity of the side frame and the accommodating cavity of the battery pack body at the same time, achieving a double sealing effect and better ensuring the sealing performance of the battery pack.

[0020] Furthermore, the connecting ear plates are arranged at intervals, and are provided with through holes for the fasteners to pass through. The positions on the inner wall corresponding to the connecting ear plates protrude inward, thereby dividing the cavity between the inner wall and the outer wall into a fastener insertion cavity and a non-fastener installation cavity, and the non-fastener installation cavity is provided with insulation material.

[0021] Beneficial effect: By arranging the thermal insulation material in the non-fastener installation cavity, the temperature of the battery cells in the middle part can be basically kept consistent with the temperature of the battery cells in the surrounding area, thereby maximizing the working performance of the battery pack.

[0022] Furthermore, the inner side wall includes a pair of transverse side walls and a pair of longitudinal side walls, and the side wall further includes two longitudinal connecting plates, which are used to offset the expansion force generated during the charging and discharging process of the battery cell;

[0023] Two longitudinal connecting plates are arranged in parallel and spaced apart, and are respectively connected to the two transverse side walls to divide the accommodating cavity into three parts;

[0024] The part between the two longitudinal connecting plates is used to install the battery cells, and the other two parts form a buffer area, which is used to buffer the external extrusion of the side panels.

[0025] Beneficial effects: The longitudinal connecting plate can, on the one hand, eliminate the expansion force generated during the charging and discharging process of the battery cell, and at the same time play a role in positioning the battery cell; on the other hand, the longitudinal connecting plate divides the space of the accommodating cavity into three parts, which is convenient for the arrangement of the battery cells in the battery pack, and at the same time leaves a buffer area to prevent the side panels from being squeezed by the outside and causing certain damage to the battery cells.

[0026] Furthermore, the side panel further includes a transverse connecting plate, both ends of which are respectively connected to the two longitudinal connecting plates to separate the battery cells on both sides of the transverse connecting plate.

[0027] Beneficial effect: The transverse connecting plate and the longitudinal connecting plate together position the battery cells, and the longitudinal connecting plate separates the battery cells on both sides thereof, thereby preventing the battery cells from being close together and affecting the heat dissipation of the battery cells.

[0028] Furthermore, a set distance is left between the bottom end of the longitudinal connecting plate and the bottom end of the side frame, and a longitudinal fixing plate is provided on the bottom plate. The longitudinal fixing plate is connected and fixed to the longitudinal connecting plate, and the thickness of the longitudinal fixing plate is the same as the set distance.

[0029] Beneficial effect: During assembly, the longitudinal connecting plate and the longitudinal fixing plate can be fixed to each other to achieve a tight connection between the side frame and the bottom plate, and then the cover plate, side panel and bottom plate are fixed and assembled as a whole through fasteners to ensure the overall reliability of the battery pack box.

[0030] Furthermore, the fastener passes through the cover plate, the side panel and the bottom plate simultaneously to fasten and assemble the three together.

[0031] Beneficial effects: It can reduce the number of fasteners used, making it easier to assemble the battery pack body. At the same time, since the fasteners themselves have high comprehensive mechanical properties, they can strengthen the side panels, thereby enabling the side panels to resist strong external impacts.

[0032] Furthermore, the side panels are extruded profile structures.

[0033] Beneficial effects: easy to process, and the side panels formed by extrusion have regular shapes.

[0034] The technical solution of the battery pack of the present invention is:

[0035] The battery pack includes a battery pack case and a battery cell arranged in the battery pack case. The battery pack case includes a bottom plate, side panels and a cover plate. The side panels and the bottom plate form a receiving cavity for receiving the battery cell.

[0036] The side panel is an integrated structure;

[0037] The bottom plate, side panels and cover plate are separately provided;

[0038] Sealing gaskets are provided between the bottom plate and the side panels, and between the side panels and the cover panel;

[0039] The bottom plate, side panels and cover plate are fastened together by fasteners.

[0040] The battery pack's beneficial effects: The battery pack's case connects the previously separate bottom plate, side panels, and cover plate via fasteners. The side panels are an integrated structure, simplifying assembly compared to existing technologies. The entire assembly process avoids welding, thus eliminating operations such as weld flaw detection and weld failure associated with welding. Furthermore, the battery pack case of the present invention incorporates sealing gaskets between the side panels and the bottom plate, and between the side panels and the cover plate. These gaskets ensure a tight seal within the battery pack case, thereby ensuring the operational stability of the battery pack.

[0041] Furthermore, the side enclosure includes side frames correspondingly connected to the side edges of the bottom plate, and the side frames and the bottom plate enclose the accommodating cavity;

[0042] The side frame is an inner and outer double-layer structure, including an inner wall, an outer wall and a connecting ear plate connecting the inner wall and the outer wall, and a cavity is formed between the inner wall and the outer wall.

[0043] Beneficial effects: The side frame adopts an inner and outer double-layer structure, and there is a cavity between the inner wall and the outer wall, which can reduce the weight of the side frame, save materials, reduce the cost of the support, and is conducive to the lightweight design of the battery pack.

[0044] Furthermore, the cross section of the sealing gasket is E-shaped and has two embedding openings;

[0045] The upper and lower ends of the inner wall and the outer wall are respectively embedded in the corresponding embedding openings to achieve double sealing of the battery pack box.

[0046] Beneficial effect: The E-shaped sealing gasket can seal the cavity of the side frame and the accommodating cavity of the battery pack body at the same time, achieving a double sealing effect and better ensuring the sealing performance of the battery pack.

[0047] Furthermore, the connecting ear plates are arranged at intervals, and are provided with through holes for the fasteners to pass through. The positions on the inner wall corresponding to the connecting ear plates protrude inward, thereby dividing the cavity between the inner wall and the outer wall into a fastener insertion cavity and a non-fastener installation cavity, and the non-fastener installation cavity is provided with insulation material.

[0048] Beneficial effect: By arranging the thermal insulation material in the non-fastener installation cavity, the temperature of the battery cells in the middle part can be basically kept consistent with the temperature of the battery cells in the surrounding area, thereby maximizing the working performance of the battery pack.

[0049] Furthermore, the inner side wall includes a pair of transverse side walls and a pair of longitudinal side walls, and the side wall further includes two longitudinal connecting plates, which are used to offset the expansion force generated during the charging and discharging process of the battery cell;

[0050] Two longitudinal connecting plates are arranged in parallel and spaced apart, and are respectively connected to the two transverse side walls to divide the accommodating cavity into three parts;

[0051] The part between the two longitudinal connecting plates is used to install the battery cells, and the other two parts form a buffer area, which is used to buffer the external extrusion of the side panels.

[0052] Beneficial effects: The longitudinal connecting plate can, on the one hand, eliminate the expansion force generated during the charging and discharging process of the battery cell, and at the same time play a role in positioning the battery cell; on the other hand, the longitudinal connecting plate divides the space of the accommodating cavity into three parts, which is convenient for the arrangement of the battery cells in the battery pack, and at the same time leaves a buffer area to prevent the side panels from being squeezed by the outside and causing certain damage to the battery cells.

[0053] Furthermore, the side panel further includes a transverse connecting plate, both ends of which are respectively connected to the two longitudinal connecting plates to separate the battery cells on both sides of the transverse connecting plate.

[0054] Beneficial effect: The transverse connecting plate and the longitudinal connecting plate together position the battery cells, and the longitudinal connecting plate separates the battery cells on both sides thereof, thereby preventing the battery cells from being close together and affecting the heat dissipation of the battery cells.

[0055] Furthermore, a set distance is left between the bottom end of the longitudinal connecting plate and the bottom end of the side frame, and a longitudinal fixing plate is provided on the bottom plate. The longitudinal fixing plate is connected and fixed to the longitudinal connecting plate, and the thickness of the longitudinal fixing plate is the same as the set distance.

[0056] Beneficial effect: During assembly, the longitudinal connecting plate and the longitudinal fixing plate can be fixed to each other to achieve a tight connection between the side frame and the bottom plate, and then the cover plate, side panel and bottom plate are fixed and assembled as a whole through fasteners to ensure the overall reliability of the battery pack box.

[0057] Furthermore, the fastener passes through the cover plate, the side panel and the bottom plate simultaneously to fasten and assemble the three together.

[0058] Beneficial effects: It can reduce the number of fasteners used, making it easier to assemble the battery pack body. At the same time, since the fasteners themselves have high comprehensive mechanical properties, they can strengthen the side panels, thereby enabling the side panels to resist strong external impacts.

[0059] Furthermore, the side panels are extruded profile structures.

[0060] Beneficial effects: easy to process, and the side panels formed by extrusion have regular shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 An exploded view of the battery pack of the present invention;

[0062] Figure 2 for Figure 1 Top view of the center side;

[0063] Figure 3 for Figure 1 A schematic cross-sectional view of the mid-side;

[0064] Figure 4 Schematic diagram of the installation of the sealing gasket in the battery pack of the present invention;

[0065] Figure 5 Schematic diagram of the battery pack of the present invention after battery cells are installed.

[0066] Explanation of the reference numerals: 1-bottom plate, 2-side panel, 3-cover plate, 4-battery cell, 5-sealing gasket, 6-accommodating cavity, 7-transverse connecting plate, 8-longitudinal connecting plate, 9-embedding port, 10-long screw, 11-longitudinal fixing plate, 12-threaded hole, 13-connecting ear plate, 14-side frame through hole, 15-high-voltage connector, 16-low-voltage connector, 17-inner wall, 18-outer wall, 19-fastener through-cavity, 20-non-fastener installation cavity, 21-buffer area, 22-side frame, 23-transverse inner wall, 24-longitudinal inner wall, 25-bottom plate connecting hole, 26-fixing hole. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. That is, the embodiments described herein are only some embodiments of this application, not all embodiments. Generally, the components of the embodiments of this application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0068] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present application.

[0069] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0070] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0071] Example 1 of the battery pack of the present invention:

[0072] like Figures 1 to 5As shown, the battery pack includes a battery pack case and battery cells 4 mounted therein. The battery pack case comprises a cover plate 3, side panels 2, and a base plate 1, which are arranged separately. The side panels 2 and base plate 1 form a cavity 6 for accommodating the battery cells 4. The base plate 1 is formed from aluminum profiles using friction stir welding; the side panels 2 are extruded profiles requiring a specific mold; and the cover plate 3 is formed by stamping or composite material molding.

[0073] Specific, combined Figure 2 As can be seen, the side panel 2 includes a rectangular side frame 22 that, together with the base plate 1, defines the aforementioned accommodating cavity 6. In this embodiment, the side frame 22 is a double-layer structure, comprising an inner sidewall 17, an outer sidewall 18, and connecting tabs 13 connecting the inner and outer sidewalls 17, 18. Both the inner and outer sidewalls 17, 18 are rectangular, with a hollow cavity between them. This reduces the overall weight of the side frame 22, conserves manufacturing materials, and meets the lightweight design requirements of the battery pack. Each inner and outer sidewall 17, 18 comprises a pair of opposing transverse sidewalls and a pair of opposing longitudinal sidewalls. Multiple connecting tabs 13 are spaced along the respective extensions of the transverse and longitudinal sidewalls, each with a side frame through-hole 14 for fastener insertion. The corresponding connecting tabs 13 on the transverse and longitudinal inner sidewalls 23, 24 are protruding inward to provide space for fastener insertion. In this way, the cavity between the inner wall 17 and the outer wall 18 can be divided into two parts, of which the fastener insertion cavity 19 corresponding to the connecting ear plate 13 is the fastener insertion cavity 19, and the part between the two adjacent connecting ear plates 13 is the non-fastener installation cavity 20. During installation, the non-fastener installation cavity 20 is filled with corresponding insulation material, such as foam sponge, which can improve the overall insulation effect of the battery pack. In addition, the insulation material is arranged circumferentially around the battery cell 4, which can also reduce the temperature difference between the battery cell in the middle of the accommodating cavity 6 and the battery cells on the periphery, so that the temperature of each battery cell 4 in the accommodating cavity 6 can be basically consistent, thereby maximizing the working performance of the battery pack.

[0074] Depend on Figure 1 、 Figure 2 and Figure 3As can be seen, the side panel 2 also includes a longitudinal connecting plate 8, the two ends of which are respectively connected to the transverse inner side wall 23, and a set distance is left between the top end of the longitudinal connecting plate 8 and the upper end of the side frame, and between the lower end and the bottom end of the side frame. Two longitudinal connecting plates 8 are spaced apart in the accommodating chamber 6, thereby dividing the accommodating chamber 6 into three parts along the horizontal direction. These three parts are the battery installation portion between the two longitudinal connecting plates 8 and the buffer area 21 located on both sides of the battery installation portion. The battery cells 4 are installed in the battery installation portion. The buffer area 21 is used to buffer the external pressure on the side panel, preventing the pressure from being transmitted to the corresponding battery cells, and providing a certain degree of protection for the battery cells. Of the two buffer areas, the lateral width of one buffer area is greater than the lateral width of the other buffer area. The buffer area with the larger lateral width is installed with the battery management system, while the buffer area with the smaller lateral width is a cavity.

[0075] The longitudinal connecting plate 8 is also a double-layer structure with a hollow interior to reduce its own weight. The longitudinal connecting plate 8 is provided with a bottom plate connecting hole 25, and a plurality of bottom plate connecting holes 25 are provided at intervals along the extending direction of the longitudinal connecting plate 8. Figure 1 As shown, the base plate 1 is provided with a longitudinal fixing plate 11 corresponding to the longitudinal connecting plate 8. The longitudinal fixing plate 11 has a fixing hole coaxial with the base plate connecting hole 25. The thickness of the longitudinal fixing plate 11 is equal to the vertical distance between the lower end of the longitudinal connecting plate 8 and the bottom end of the side frame 22. As a result, when the side panels 2 are assembled with the base plate 1, the longitudinal fixing plate 11 can precisely support the longitudinal connecting plate 8.

[0076] The side panel 2 also includes transverse connecting plates 7, two of which are spaced longitudinally within the battery mounting portion. The ends of the transverse connecting plates 7 are connected to corresponding longitudinal connecting plates 8, thereby dividing the battery mounting portion into three mounting cavities. Battery cells are stacked in rows in each mounting cavity. A gap exists between the transverse connecting plates 7 and the sides of the battery cells 4. During assembly, this gap can be filled with structural adhesive, bonding the battery cells 4 to the transverse connecting plates 7 and ensuring reliable fixation. The battery cells 4 located at the front and rear ends of the mounting cavity contact the corresponding longitudinal connecting plates 8, which dissipate the expansion force generated by the battery cells 4 during charging and discharging, preventing them from arching outward. The transverse connecting plates 7 separate the battery cells in adjacent mounting cavities to prevent them from being placed too close together, which would be detrimental to heat dissipation. The transverse connecting plates 7 and longitudinal connecting plates 8 position the battery cells.

[0077] The battery pack box further includes a sealing gasket 5 provided between the side wall 2 and the bottom plate 1, and between the side wall 2 and the cover plate 3. In this embodiment, the cross section of the sealing gasket 5 is E-shaped. Figure 4As shown, the sealing gasket 5 has two embedding openings 9. During installation, the sealing gasket 5 is buckled on the top and bottom of the side frame 22, and the upper and lower ends of the inner side wall 17 and the outer side wall 18 of the side frame 22 are embedded in the corresponding embedding openings 9, thereby sealing the cavity of the side frame 22 and the accommodating cavity at the same time, thereby achieving double sealing.

[0078] The assembly process of the battery pack of the present invention is as follows: first, the side panels 2 and the bottom panel 1 are pre-fixed together using fasteners, which are long screws 10. The long screws 10 are passed through the side frame perforations 14 and into the corresponding mounting holes on the bottom panel 1 to pre-fix the side panels 2 and the bottom panel 1. At this time, the longitudinal fixing plate 11 supports the longitudinal connecting plate 8, and the fixing holes 26 and the bottom panel connecting holes 25 are coaxial. Then, structural adhesive is applied to the upper surface of the bottom panel 1, and the stacked battery cells 4 are placed into the battery mounting portion. The battery cells 4 are then pressed down to the required adhesive thickness and dried to ensure a secure bond between the battery cells 4 and the bottom panel 1. After the battery cells 4 are cured, structural adhesive is filled into the gaps between the first and last battery cells 4 and the longitudinal connecting plate 8, as well as the gaps between the side surfaces of the battery cells 4 and the inner sidewalls 17, to achieve full-scale bonding between the battery cells 4 and the side panels 2. After the battery cells 4 are securely installed, the longitudinal fixing plates 11 are fixedly connected to the longitudinal connecting plates 8 by threading screws through the corresponding bottom plate connection holes 25 and engaging with the fixing holes 26. This increases the rigidity of the longitudinal connecting plates 8 and improves the shock resistance of the battery cells 4. It should be noted that the sealing gaskets are already installed at the lower ends of the side frames before the longitudinal connecting plates are connected to the longitudinal fixing plates. At this point, the position of the side frames 22 is relatively fixed, allowing them to be filled with foam. Accordingly, the high-voltage and low-voltage connectors 15 and 16 can be installed on the side panels 2, along with the high- and low-voltage wiring harnesses, aluminum bars, and copper-aluminum busbars. After installation, the sealing gaskets are buckled onto the tops of the side frames. Meanwhile, the long screws 10 are installed through the cover plate 3 and side panels 2, engaging with the corresponding threaded holes in the bottom plate 1, completing the assembly of the entire battery pack. Due to their high overall mechanical properties, the long screws reinforce the side panels, thereby providing the battery pack with a higher structural strength, thus enabling it to withstand strong external impacts and effectively protecting the battery cells.

[0079] The battery pack of the present invention eliminates the traditional module structure through the design of the side panels, so that the battery cells are directly fixed in the battery pack case, thereby realizing direct conversion from battery cells to battery packs, making full use of the space in the battery pack case, eliminating the need for structural parts, and reducing costs; in addition, the cover plate, side panels and bottom plate are fastened together by fasteners installed at the same time, which has a simple structure, avoids welding during assembly, and simplifies the assembly process.

[0080] Example 2 of the battery pack of the present invention:

[0081] The difference between this embodiment and the above-mentioned embodiment 1 is that, in this embodiment, the side frame adopts a solid structure and has a certain thickness to maintain the structural strength of the battery pack body. At this time, through holes can be provided on the side frame to install fasteners.

[0082] Example 3 of the battery pack of the present invention:

[0083] The difference between this embodiment and the above-mentioned embodiment 1 is that, in this embodiment, the sealing gasket does not adopt an E-shaped structure, but adopts a rectangular ring-shaped sealing gasket without an embedding opening, and the sealing gasket is arranged at the top and bottom of the side frame.

[0084] Example 4 of the battery pack of the present invention:

[0085] The difference between this embodiment and the above-mentioned embodiment 1 is that, in this embodiment, only one longitudinal connecting plate is provided, which divides the accommodating cavity into a battery management system installation portion and a battery cell installation portion. At this time, there is no buffer area, and accordingly, the structural strength of the side frame is increased, and the inner side wall of the side frame can be used to eliminate the expansion force generated by the battery cell.

[0086] In other embodiments, corresponding reinforcing ribs may be provided on the inner side walls of the side frames. During assembly, the first and last battery cells are brought into contact with the reinforcing ribs, thereby utilizing the reinforcing ribs to eliminate the expansion force generated by the battery cells.

[0087] Example 5 of the battery pack of the present invention:

[0088] The difference between this embodiment and the above-mentioned embodiment 1 is that, in this embodiment, no transverse connecting plate is provided, and a certain gap is left between each battery cell.

[0089] Example 6 of the battery pack of the present invention:

[0090] The difference between this embodiment and the above-mentioned embodiment 1 is that, in this embodiment, the height of the longitudinal connecting plate is consistent with the height of the side frame, and the longitudinal fixing plate is not required.

[0091] Example 7 of the battery pack of the present invention:

[0092] The difference between this embodiment and the above-mentioned embodiment 1 is that, in this embodiment, the side panels are integrally formed by casting.

[0093] Specific embodiment of the battery pack box of the present invention:

[0094] The structure of the battery pack case is the same as that of the battery pack case in the above-mentioned battery pack embodiment, and will not be repeated here.

[0095] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. The scope of patent protection of the present application shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present application shall also be included in the scope of protection of the present application.

Claims

1. A battery pack box, comprising a bottom plate, side panels and a cover plate, wherein the side panels and the bottom plate form a receiving cavity for receiving a battery cell, characterized in that: The side panel is an integrated structure; The bottom plate, side panels and cover plate are separately provided; Sealing gaskets are provided between the bottom plate and the side panels, and between the side panels and the cover panel; The bottom plate, side panels and cover plate are fastened together by fasteners; The side panels include side frames connected to the respective side edges of the bottom plate. The side frames are double-layer structures, including an inner wall, an outer wall, and connecting ear plates connecting the inner and outer walls. The positions of the inner wall corresponding to the connecting ear plates are protruding inwards. The cross section of the sealing gasket is E-shaped and has two embedding openings. The upper and lower ends of the inner wall and the outer wall are respectively embedded in the corresponding embedding openings to achieve double sealing of the battery pack box.

2. The battery pack case according to claim 1, characterized in that: The side frame and the bottom plate form the accommodating cavity; There is a cavity between the inner wall and the outer wall.

3. The battery pack case according to claim 2, characterized in that: The connecting ear plates are arranged at intervals, and are provided with through holes for the fasteners to pass through. The cavity between the inner wall and the outer wall is divided into a fastener insertion cavity and a non-fastener installation cavity, and the non-fastener installation cavity is provided with insulation material.

4. The battery pack case according to claim 2, characterized in that: The inner side wall includes a pair of transverse side walls and a pair of longitudinal side walls, and the side wall also includes two longitudinal connecting plates, which are used to offset the expansion force generated during the charging and discharging process of the battery cell; Two longitudinal connecting plates are arranged in parallel and spaced apart, and are respectively connected to the two transverse side walls to divide the accommodating cavity into three parts; The part between the two longitudinal connecting plates is used to install the battery cells, and the other two parts form a buffer area, which is used to buffer the external extrusion of the side panels.

5. The battery pack case according to claim 4, characterized in that: The side panel further includes a transverse connecting plate, both ends of which are connected to the two longitudinal connecting plates respectively to separate the battery cells on both sides of the transverse connecting plate.

6. The battery pack case according to claim 5, characterized in that: A set distance is left between the bottom end of the longitudinal connecting plate and the bottom end of the side frame. A longitudinal fixing plate is provided on the bottom plate. The longitudinal fixing plate is connected and fixed to the longitudinal connecting plate, and the thickness of the longitudinal fixing plate is the same as the set distance.

7. The battery pack case according to claim 1 or 2, characterized in that: The fasteners pass through the cover plate, the side panels and the bottom panel simultaneously to fasten and assemble the three together.

8. The battery pack case according to claim 1, characterized in that: The side panels are extruded profile structures.

9. A battery pack, comprising a battery pack case and a battery cell disposed in the battery pack case, characterized in that: The battery pack case is the battery pack case according to any one of claims 1 to 8.

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