Lower box body and battery pack

Abstract

The utility model discloses a lower box body and a battery pack, the lower box body is used for supporting a battery cell module, the lower box body comprises a box body frame, the box body frame is composed of a plurality of steel splicing beams, the splicing beams form a cavity, and liquid leakage holes communicated with the cavity are formed in the splicing beams. According to the lower box body, the box body frame is composed of the steel splicing beams, the splicing beams form the cavity structure, and the box body frame serves as a bearing structure of the lower box body and has the advantages of being low in cost and high in structural strength; furthermore, liquid leakage holes communicated with the cavity are formed in the splicing beam, and when electrophoresis is carried out on the steel splicing beam, electrophoretic paint liquid can smoothly enter the cavity through the liquid leakage holes due to the existence of the liquid leakage holes, so that the effect of completely covering the inner surface and the outer surface of the cavity with the electrophoretic paint film is achieved; a blank area with not-in-place electrophoresis is avoided, and the risk that the box body frame is corroded is effectively avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically to a lower box, and also to a battery pack including the lower box. Background Art

[0002] In the application of power batteries for new energy vehicles, the battery lower box serves as a mechanical bearing structure to achieve the overall mechanical performance requirements and the installation and sealing of the internal parts of the battery pack. At the same time, the battery lower box is also a large part of the battery pack cost. At present, the mainstream passenger car power battery lower box in the market is mainly made of aluminum profile welding. The aluminum profile welding box has a simple process and excellent performance, but the high raw material cost of aluminum leads to a high cost of aluminum profile box. Under the increasingly fierce market competition of new energy vehicles, a battery lower box with excellent mechanical properties and low cost is particularly important. Utility Model Content

[0003] In view of this, the present application provides a lower box and also provides a battery pack including the above-mentioned lower box, which solves the problem of high cost and low structural strength of the lower box.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A lower box body is used to support a battery core module, comprising a box body frame, wherein the box body frame is composed of a plurality of steel splicing beams, the splicing beams form a cavity, and the splicing beams are provided with a leakage hole connected to the cavity.

[0006] Optionally, in the above-mentioned lower box body, the mold cavity includes a middle straight portion and a bent portion connected to both ends of the straight portion;

[0007] A partition is formed inside the cavity; one of the bent portions forms the partition, and an end of the bent portion is close to the straight portion, and an end of the other bent portion is located near a side of the partition away from the straight portion.

[0008] Optionally, in the above lower box, the multiple spliced ​​beams constituting the box frame include:

[0009] A plurality of frame beams, forming the outer perimeter of the box frame;

[0010] The cross beam and the longitudinal beam are arranged inside the plurality of frame beams;

[0011] Wherein, an adapter bracket is provided at the end of the cross beam to be connected to the frame beam through the adapter bracket; and / or an adapter bracket is provided at the end of the longitudinal beam to be connected to the cross beam or the frame beam through the adapter bracket.

[0012] Optionally, in the above-mentioned lower box body, the adapter bracket includes a first part and a second part connected together, the first part is sleeved on the end of the beam, and the second part is closely connected to the side wall of the frame beam.

[0013] Optionally, in the above-mentioned lower box body, the longitudinal beam includes a plurality of sub-longitudinal beams parallel to the extension direction of the longitudinal beam, and adjacent sub-longitudinal beams are fixedly connected by connecting rods.

[0014] Optionally, in the above-mentioned lower box, the bottom of the box frame is sealed with a cold plate; the bottom of the cold plate is sealed with a bottom protective plate.

[0015] Optionally, in the above lower box,

[0016] The cold plate is riveted to the box frame; a first insulating seal is provided between the cold plate and the box frame;

[0017] and / or,

[0018] The bottom guard plate is threadedly connected to the box frame; a second insulating seal is arranged between the bottom guard plate and the cold plate.

[0019] Optionally, in the above-mentioned lower box, a second insulating seal is provided between the bottom guard plate and the cold plate;

[0020] A limiting member is provided on a side surface of the cold plate away from the box frame, and the second insulating seal is limited at the periphery of the limiting member so that the second insulating seal is positioned between the bottom guard plate and the cold plate.

[0021] Optionally, in the above lower box, a buffer is provided between the cold plate and the bottom guard plate; wherein:

[0022] The buffer member is an elastic pad;

[0023] and / or,

[0024] A buffer limiting structure is provided on a side surface of the bottom guard plate close to the cold plate, and the buffer member is limited in the buffer limiting structure;

[0025] and / or,

[0026] The bottom guard plate is provided with reinforcing ribs.

[0027] A battery pack comprises the lower box body described above.

[0028] In the lower box and battery pack provided by the present application, the box frame is composed of steel spliced ​​beams, and the spliced ​​beams form a cavity structure. The above-mentioned box frame serves as the bearing structure of the lower box and has the advantages of low cost and high structural strength. Furthermore, a leakage hole connected to the cavity is provided on the spliced ​​beam. When electrophoresis is performed on the steel spliced ​​beam, the presence of the leakage hole allows the electrophoretic paint liquid to smoothly enter the interior of the cavity through the leakage hole, thereby achieving the effect of fully covering the inner and outer surfaces of the cavity with the electrophoretic paint film, avoiding the blank area where electrophoresis is not in place, and effectively avoiding the risk of corrosion of the box frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the structure of the box frame of this application;

[0031] Figure 2 This is a schematic diagram of the structure of the spliced ​​beam of this application;

[0032] Figure 3 A cross-sectional view of a spliced ​​beam of the present application;

[0033] Figure 4 This is a schematic diagram of the structure of the connection between the cross beam and the frame beam of the present application;

[0034] Figure 5 This is a schematic diagram of the structure of the adapter bracket for this application;

[0035] Figure 6 A bottom view of the connection between the cold plate and the box frame of the present application;

[0036] Figure 7 This is an exploded view of the lower frame of this application.

[0037] Figure 1-Figure 7 middle:

[0038] 1. Box frame; 2. Plug-in panel; 3. Cold plate; 4. Bottom guard plate; 5. Buffer; 6. Rivet nut; 7. Second insulating seal;

[0039] 11. Splicing beam; 12. Leakage hole;

[0040] 31. Limiting member; 32. Liquid cooling channel;

[0041] 41. Buffer limit structure; 42. Reinforcement ribs;

[0042] 111. frame beam; 112. cross beam; 113. longitudinal beam; 114. adapter bracket; 115. strengthening support rod;

[0043] 1111, left side frame beam; 1112, right side frame beam; 1113, front side frame beam; 1114, rear side frame beam;

[0044] 1131, longitudinal beam; 1132, connecting rod;

[0045] 1141, Part 1; 1142, Part 2. DETAILED DESCRIPTION

[0046] The present application provides a lower box and also provides a battery pack including the lower box.

[0047] 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. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] like Figure 1-7 As shown, a lower box body is used to support a battery cell module. The lower box body includes a box body frame 1, and the box body frame 1 is composed of a plurality of steel splicing beams 11. The splicing beams 11 are formed with a cavity, and the splicing beams 11 are provided with a leakage hole 12 communicating with the cavity.

[0049] It should be noted that high-strength steel plates are selected as raw materials and formed by a rolling process to obtain steel splicing beams 11 with a cavity structure. Multiple splicing beams 11 are spliced ​​to obtain a box frame 1; preferably, multiple splicing beams 11 are welded together. The box frame 1 is a full steel frame, and the roll forming efficiency is high. The low raw material cost and high strength characteristics of steel realize the low cost and high structural strength of the box frame 1.

[0050] The box frame 1 serves as the main load-bearing structure of the lower box. Its interior is divided into different areas such as the electrical compartment and the battery cell compartment through a plurality of spliced ​​beams 11 to accommodate electrical components, battery cell modules and other components respectively, thereby reducing the thermal impact of the electrical components inside the battery pack shell on the battery cell modules and improving the safety of the manufactured battery pack.

[0051] The electrical components in the electrical compartment are mainly used to connect the battery cell modules inside the battery pack to ensure energy transmission, management and monitoring inside the battery pack.

[0052] It should be further explained that in order to prevent the steel splicing beams 11 from corroding due to contact with the outside air and affecting the structural strength of the lower box, the splicing beams 11 need to be electrophoretically treated. The steel splicing beams 11 can be electrophoretically treated first, and then the spliced ​​beams 11 after electrophoresis are spliced ​​into a box frame 1; or, the splicing beams 11 can be spliced ​​into a full steel box frame 1 first, and then the spliced ​​box frame 1 is electrophoretically treated as a whole. Electrophoretic treatment refers to immersing the pre-treated (such as degreasing, rust removal, cleaning and activation) parts to be electrophoretically treated in an electrophoretic paint tank containing electrophoretic paint, and applying electricity so that a uniform and dense paint film is deposited on the surface of the parts to be electrophoretically treated.

[0053] Furthermore, the leakage hole 12 is cut out on the side wall of the cavity of the spliced ​​beam 11 by using laser cutting technology, and the laser cutting technology prevents metal chips from remaining on the surface of the spliced ​​beam 11 .

[0054] Since a leakage hole 12 connected to the cavity is provided on the spliced ​​beam 11, when electrophoresis is performed on the spliced ​​beam 11 or the box frame 1, the electrophoretic paint liquid will smoothly enter the interior of the cavity through the leakage hole 12, thereby achieving the effect of fully covering the inner and outer surfaces of the cavity with the electrophoretic paint film, avoiding the blank area where electrophoresis is not in place, and effectively avoiding the risk of corrosion of the box frame 1.

[0055] Please refer to the attached Figure 3 In some embodiments of the present application, the cavity includes a straight portion a and a first bent portion b and a second bent portion c respectively connected to both ends of the straight portion a. A partition b1 is formed inside the cavity; the first bent portion b forms the partition b1, and the first end b2 of the first bent portion b is close to the straight portion a. The second end c1 of the second bent portion c is located near the side of the partition b1 away from the straight portion a.

[0056] It should be noted that the spliced ​​beam 11 of the present application is obtained by bending a steel plate to obtain a cavity structure; preferably, the spliced ​​beam 11 is obtained by a roll forming process from a steel plate. The flat plate comprises a straight portion a in the middle, and a first bending portion b and a second bending portion c at both ends of the straight portion a; the straight portion a keeps a fixed shape, and the first bending portion b and the second bending portion c are rolled to finally obtain a spliced ​​beam 11 with a cavity.

[0057] As described above, a cavity structure with a cross-sectional shape of "日" (Chinese character for sun) or a variant shape of "日" is obtained; the partition b1 is formed inside the cavity, which plays a role of stable support inside the cavity and effectively increases the structural strength of the splicing beam 11. Further, the first end b2 of the first bending part b and the second end c1 of the second bending part c are respectively located on both sides of the partition b1, ensuring the least amount of sheet material used to enclose the shape of "日" or its variant shape, saving material costs, and achieving lightweight design of the structure.

[0058] In some embodiments, the cross-sectional shape of the cavity is any one of "口" (Chinese character for square), "日", "目" (Chinese character for eye), and their variant shapes.

[0059] It should be noted that, according to the position, required structural strength, sealing and other requirements of the splicing beam 11, the cross-sectional shape of its cavity can be designed as "口", "日", "目" and other variant shapes. Further, through the rolling process, the high-strength steel plate is bent in sequence, and different cross-sectional shapes of the cavity are obtained according to the positions and angles of the sequential bending.

[0060] The "口" shape means that the cavity has a rectangular chamber. The variant shape of "口" means that the cavity has only one chamber, but the shape of the chamber is non-rectangular. The "日" shape means that the cavity is divided into two independent rectangular chambers. The variant shape of "日" means that the cavity is divided into two independent chambers, and at least one of the chambers has a non-rectangular shape. The "目" shape means that the cavity is divided into three independent rectangular chambers. The variant shape of "目" means that the cavity is divided into three independent chambers, and at least one of the chambers has a non-rectangular shape. Of course, the cavity can also be set with other cross-sectional shapes, which will not be elaborated here one by one.

[0061] Please refer to the attached Figure 2 , and it should be further noted that when the cavity has one or more independent chambers, liquid leakage holes 12 communicating with the outside are provided on the side walls of each independent chamber; the number of liquid leakage holes 12 in each chamber can be set to one or multiple, which will not be elaborated here one by one. As described above, it can ensure that the inner surface of each chamber in the cavity can be fully covered with electrophoretic paint film, avoiding the blank area where electrophoresis is not in place.

[0062] Please refer to the attached Figure 1 , in some embodiments of the present application, the multiple splicing beams 11 constituting the box frame 1 include border beams 111, cross beams 112, and longitudinal beams 113. There are multiple border beams 111, and the multiple border beams 111 enclose the outer perimeter of the box frame 1. The cross beams 112 are arranged horizontally inside the multiple border beams 111; the longitudinal beams 113 are arranged vertically inside the multiple border beams 111.

[0063] The extending direction of the cross beam 112 is parallel to the horizontal direction. Figure 1 , 4 , along the horizontal direction, adapter brackets 114 are respectively provided at both ends of the cross beam 112 , and the cross beam 112 is connected to the frame beam 111 through the adapter brackets 114 .

[0064] It should be noted that the horizontal Figure 1 Direction indicated by the arrow.

[0065] Please see attached Figure 7 The box frame 1 is a rectangular parallelepiped frame structure, and four frame beams 111 are provided. The four frame beams 111 are respectively connected end to end, namely, a left frame beam 1111, a front frame beam 1113, a right frame beam 1112, and a rear frame beam 1114. Both ends of the frame beam 111 are provided with mounting openings, and the mounting openings of adjacent frame beams 111 can be matched and spliced ​​together and welded. Furthermore, the mounting openings of the frame beam 111 are obtained by a laser welding process, and the laser welding process avoids metal scraps from remaining.

[0066] The extension direction of the front frame beam 1113 and the extension direction of the rear frame beam 1114 are parallel to the horizontal direction. The extension direction of the longitudinal beam 113, the extension direction of the left frame beam 1111, and the extension direction of the right frame beam 1112 are parallel to the longitudinal direction. Figure 1 Direction indicated by the arrow.

[0067] Further, the two ends of the crossbeam 112 are respectively provided with mounting openings; the mounting openings of the crossbeam 112 are obtained by laser welding. The two mounting openings of the crossbeam 112 are respectively connected to the adapter bracket 114 to form a crossbeam assembly, and the two ends of the crossbeam assembly are respectively connected to the left frame beam 1111 and the right frame beam 1112 through the adapter bracket 114. The connection between the crossbeam 112 and the adapter bracket 114 includes but is not limited to any one of welding, riveting, and threaded connection, preferably welding; the connection of the adapter bracket 114 on the left frame beam 1111 and / or the right frame beam 1112 includes but is not limited to any one of welding, riveting, and threaded connection, preferably welding. By setting the adapter bracket 114, the transition connection of the crossbeam 112 on the frame beam 111 is realized, which increases the connection area between the crossbeam 112 and the frame beam 111, thereby ensuring the reliable fixed connection effect of the crossbeam 112 on the frame beam 111, thereby ensuring the structural strength and stability of the box frame 1.

[0068] For details, please refer to the attached Figure 1 , 6There are two cross beams 112, one of which is spaced apart from the front frame beam 1113, and the space between the cross beam 112 and the front frame beam 1113 forms an electrical compartment; and a plurality of spaced reinforcing support rods 115 are arranged on the cross beam 112, the extending direction of the reinforcing support rods 115 is parallel to the longitudinal direction, and the end of the reinforcing support rod 115 away from the cross beam 112 is welded to the front frame beam 1113. The other cross beam 112 is arranged close to the inner wall of the rear frame beam 1114.

[0069] It should be noted that one crossbeam 112 can be provided, and the crossbeam 112 is close to the front frame beam 1113 and has a spacing distance between the crossbeam 112 and the front frame beam 1113; in this case, along the longitudinal direction, the two ends of the longitudinal beam 113 are respectively welded between the crossbeam 112 and the rear frame beam 1114. Of course, two crossbeams 112 can also be provided, and one of the crossbeams 112 has a spacing distance between it and the front frame beam 1113, and the other crossbeam 112 is arranged close to the inner side wall of the rear frame beam 1114; in this case, along the longitudinal direction, the two ends of the longitudinal beam 113 are respectively welded between the two crossbeams 112 arranged at intervals. Of course, multiple crossbeams 112 can also be provided, and the longitudinal beam 113 is arranged between the crossbeam 112 and the frame beam 111 according to the arrangement position of the crossbeam 112, or between the two crossbeams 112, and the specific setting situation will not be repeated here one by one.

[0070] The end of the longitudinal beam 113 can be directly welded to the cross beam 112 or the frame beam 111; of course, an adapter bracket 114 can also be set at the end of the longitudinal beam 113 to achieve a transition connection between the longitudinal beam 113 and the cross beam 112 or the frame beam 111 through the adapter bracket 114.

[0071] By welding the transverse beams 112 and longitudinal beams 113 arranged transversely and longitudinally inside the frame beams 111 , a stable box frame 1 structure is formed, thereby effectively improving the shortcomings of the box frame 1 such as low modality and weak strength.

[0072] A battery cell compartment group is formed between the two spaced cross beams 112 , and the battery cell compartment group is divided into a plurality of battery cell compartments by the longitudinal beams 113 , each of which accommodates a battery cell module.

[0073] Please see attached Figure 5 In some embodiments of the present application, the adapter bracket 114 includes a first portion 1141 and a second portion 1142 connected together. The first portion 1141 is sleeved on the end of the cross beam 112, and the second portion 1142 is closely connected to the side wall of the frame beam 111.

[0074] As described above, the contact area between the first portion 1141 and the cross beam 112 is fully guaranteed, while the contact area between the second portion 1142 and the frame beam 111 is fully guaranteed, thereby ensuring a secure connection effect of the cross beam 112 on the frame beam 111 through the adapter bracket 114.

[0075] Specifically: the first part 1141 is a U-shaped structure, and the first part 1141 of the U-shaped structure is sleeved in the installation opening at the end of the cross beam 112, which fully guarantees the contact area between the first part 1141 and the cross beam 112. The second part 1142 includes three areas, and the three areas of the second part 1142 are respectively perpendicular to the horizontal direction and are sequentially connected to the ends of the U-shaped structure of the first part 1141, which fully guarantees the contact area between the second part 1142 and the frame beam 111.

[0076] In certain embodiments of the present application, the longitudinal beam 113 includes a plurality of sub-longitudinal beams 1131 parallel to the longitudinal direction, and adjacent sub-longitudinal beams 1131 are fixedly connected by connecting rods 1132 .

[0077] It should be noted that when N battery cell compartments need to be set, N-1 longitudinal beams 113 are evenly set between the two cross beams 112; in order to enhance the structural strength of the longitudinal beam 113 and ensure the energy density of the battery, two or more longitudinal beams 1131 can be set. Preferably, one longitudinal beam 113 is provided and located in the middle position between the two cross beams 112 to divide the battery cell compartment group into two battery cell compartments; the longitudinal beam 113 includes two longitudinal beams 1131 to form a double longitudinal beam structure, so that the overall structural strength of the box frame 1 is higher.

[0078] Please see attached Figure 7 In certain embodiments of the present application, a plug-in panel 2 protruding from the box frame 1 is provided on the rear side frame beam 1114 of the box frame 1 .

[0079] It should be noted that the rear frame beam 1114 is partially cut to obtain a mounting groove, and the plug-in panel 2 is welded to the mounting groove to form a rear frame beam assembly. The plug-in panel 2 is a C-shaped panel, and the C-shaped panel protrudes outward from the box frame 1; the plug-in panel 2 protruding outward provides a larger space for connecting external plug-ins, thereby realizing the connection between the battery pack and the external system. Furthermore, the left and right side walls of the plug-in panel 2 and the area of ​​the rear frame beam where the plug-in panel 2 is not set form a concave space relative to the plug-in panel 2, which increases the space for accommodating the rear fuel tank for hybrid vehicles.

[0080] It should be further explained that the plug-in panel 2 is responsible for connecting the battery pack with external systems, such as the vehicle's power system, charging equipment, temperature control system, and the communication interface between the BMS and other on-board controllers.

[0081] Please see attached Figure 6 , 7 , attached Figure 6 When the bottom guard plate 4 is set, the bottom view of the lower box body is shown, and the Figure 6 The detailed structure of the liquid cooling channel 32 provided in the cold plate 3 is blocked; the liquid cooling channel 32 in the cold plate 3 can select the liquid cooling channel structure in the prior art according to actual needs. Figure 7 This is an exploded view of the lower box.

[0082] In some embodiments of the present application, a cold plate 3 is provided at the bottom of the box frame 1 to seal the bottom; and a bottom protective plate 4 is provided at the bottom of the cold plate 3 to seal the bottom.

[0083] It should be noted that the bottom of the box frame 1 is sealed with a cold plate 3, which means that the bottom of the box frame 1 is provided with a cold plate 3, and the contact surface between the box frame 1 and the cold plate 3 is a sealed contact surface.

[0084] The lower box and the upper shell of the battery pack form a battery pack shell that accommodates the battery cell module. The sealing of the lower box is ensured by the sealing arrangement of the box frame 1 and the cold plate 3, thereby ensuring the sealing of the accommodation space surrounded by the lower box and the upper shell of the battery pack. Furthermore, the lower box of the present application realizes the integrated arrangement of the box frame 1 and the cold plate 3, and the lower box can provide a good cooling effect on the battery cell module while supporting the battery cell module.

[0085] It should be further explained that the bottom of the cold plate 3 is sealed with a bottom guard plate 4, which means that the bottom of the cold plate 3 is provided with a bottom guard plate 4, and the contact surface between the cold plate 3 and the bottom guard plate 4 is a sealed contact surface.

[0086] As mentioned above, the bottom guard plate 4, as the bottom structure of the lower box, can play a safety protection role for the cold plate 3 and the box frame 1 to avoid friction loss; at the same time, the bottom guard plate 4 realizes the sealing setting of the cold plate 3 in the lower box, avoiding heat conduction between the cold plate 3 and the external air, and thus can well ensure the heat exchange between the cold plate 3 and the battery cell module.

[0087] In some embodiments of the present application, the cold plate 3 is riveted to the box frame 1 .

[0088] The outer peripheral edge of the cold plate 3 is provided with a mounting hole, and the bottom of the frame beam 111 of the box frame 1 is provided with a mounting hole, and the rivets are inserted into the above two mounting holes in sequence to fix the cold plate 3 to the bottom of the box frame 1. As above, a reliable fixed connection of the cold plate 3 to the bottom of the box frame 1 is achieved.

[0089] In some embodiments, a first insulating seal is provided between the cold plate 3 and the frame beam 111 of the box frame 1 .

[0090] The first insulating sealant may be an annular cast insulating sealant or an annular insulating rubber ring.

[0091] There is enough sealing space between the outer peripheral edge of the cold plate 3 and the outer peripheral edge of the frame beam 111, and the first insulating seal is just sealed and connected in the above sealing space. As described above, the sealing connection between the cold plate 3 and the frame beam 111 is achieved, and the thermal contact between the cold plate 3 and the frame beam 111 is avoided, ensuring that there is no direct heat exchange between the cold plate and the frame beam 111, thereby ensuring the heat exchange between the cold plate 3 and the battery module.

[0092] Please see attached Figure 6 , 7 In certain embodiments of the present application, the bottom guard plate 4 is threadedly connected to the box frame 1 .

[0093] A rivet nut 6 is provided on the bottom side wall of the frame beam 111 of the box frame 1. The boss of the rivet nut 6 extending to the bottom guard plate 4 exceeds the cold plate 3. A threaded hole is provided on the outer peripheral edge of the bottom guard plate 4 so that the bottom guard plate 4 can be threadedly connected to the bottom of the box frame 1 through a threaded connector.

[0094] As described above, the detachable installation of the bottom guard plate 4 is achieved, and when the bottom guard plate 4 is worn, it is easy to disassemble, repair and replace.

[0095] In some embodiments, a second insulating seal 7 is provided between the bottom guard plate 4 and the cold plate 3 .

[0096] The second insulating sealant 7 may be an annular cast insulating sealant or an annular insulating rubber ring.

[0097] Preferably, the area of ​​the bottom guard plate 4 is larger than the area of ​​the cold plate 3. There is enough sealing space between the outer peripheral edge of the bottom guard plate 4 and the outer peripheral edge of the cold plate 3, and the second insulating seal 7 happens to be sealed and connected in the above sealing space. As described above, the sealing arrangement of the cold plate 3 in the lower box is realized by the second insulating seal 7 and the bottom guard plate 4, and the safety protection effect of the cold plate 3 is well achieved.

[0098] Please see attached Figure 6 In some embodiments of the present application, a second insulating seal 7 is provided between the bottom guard plate 4 and the cold plate 3. A limiting member 31 is provided on a side surface of the cold plate 3 away from the box frame 1. The second insulating seal 7 is limited to the periphery of the limiting member 31 so that the second insulating seal 7 is positioned between the bottom guard plate 4 and the cold plate 3.

[0099] It should be noted that the second insulating seal 7 is an annular insulating rubber ring.

[0100] When the liquid cooling channels 32 are not all arranged to the outer peripheral edge of the cold plate 3 along the circumference of the liquid cooling plate 3, a plurality of limit members 31 are arranged circumferentially and spaced apart on the inner circumference of the outer peripheral edge of the liquid cooling plate 3. At this time, the second insulating seal 7 is sleeved on the outer periphery of the limit member 31, so that the circumferential positioning of the second insulating seal 7 on the outer peripheral edge of the cold plate 3 can be achieved. As described above, the limited installation of the second insulating seal 7 is facilitated, and when the bottom guard plate 4 is connected to the box frame 1, the second insulating seal 7 will not be dislocated under the limitation of the limit member 31, thereby achieving a good pressure of the bottom guard plate 4 on the second insulating seal 7, thereby achieving a reliable sealing connection between the bottom guard plate 4 and the cold plate 3.

[0101] When the liquid cooling channel 32 is partially arranged to the outer peripheral edge of the cold plate 3 along the circumference of the liquid cooling plate 3, the limiting member 31 is only set in the area where the liquid cooling channel 32 is not arranged to the outer peripheral edge of the cold plate 3; at this time, the second insulating seal 7 is sleeved on the outer periphery of the liquid cooling channel 32 and the limiting member 31, so as to achieve the circumferential positioning of the second insulating seal 7 on the outer peripheral edge of the cold plate 3.

[0102] Please see attached Figure 7 In some embodiments of the present application, a buffer 5 is provided between the cold plate 3 and the bottom guard plate 4. The buffer 5 can play a good shock-absorbing and buffering effect, thereby achieving a good safety protection effect on the cold plate 3 and the battery cell module inside the battery pack shell.

[0103] Furthermore, the buffer 5 is an elastic pad. The elastic pad can be, but is not limited to, elastic plastic, elastic rubber, foam aluminum, memory foam, etc. The elastic plastic can be modified polypropylene (MPP for short).

[0104] In some embodiments, a buffer limiting structure 41 is provided on one side surface of the bottom guard plate 4 close to the cold plate 3 , and the buffer member 5 is limited by the buffer limiting structure 41 .

[0105] The buffer limiting structure 41 is a limiting groove formed on the bottom guard plate, the buffer member 5 is placed in the limiting groove, and the shape of the buffer member 5 is adapted to the shape of the limiting groove.

[0106] The number of the limiting grooves provided on the bottom guard plate 4 is the same as the number of the battery cell compartments of the lower box body, and the shape of the limiting grooves is adapted to the shape of the corresponding battery cell compartments. At least one buffer 5 is provided in each limiting groove. As described above, the shock absorbing and buffering effect of each battery cell module can be well achieved.

[0107] Please see attached Figure 7 In some embodiments, a reinforcing rib 42 is provided on the bottom guard plate 4. The reinforcing rib 42 enhances the structural strength of the bottom guard plate 4, thereby ensuring the reliable support effect of the lower box body on the battery module.

[0108] In summary, the present application also discloses a battery pack; the battery pack includes the lower box body described above.

[0109] Since the battery pack of the present application has the lower box body described above, the beneficial effects of the battery pack brought by the lower box body can be found above and will not be repeated here.

[0110] The components and devices involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, meaning "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0111] It should also be noted that in the device of the present application, each component can be decomposed and / or reassembled, and these decompositions and / or reassemblies should be regarded as equivalent solutions of the present application.

[0112] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0113] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

[0114] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A lower box, characterized in that: It is used to support the battery module, including a box frame, wherein the box frame is composed of a plurality of steel splicing beams, the splicing beams form a cavity, and the splicing beams are provided with a leakage hole connected to the cavity.

2. The lower box according to claim 1, characterized in that: The mold cavity includes a middle straight portion and a bent portion connected to both ends of the straight portion; A partition is formed inside the cavity; one of the bent portions forms the partition, and an end of the bent portion is close to the straight portion, and an end of the other bent portion is located near a side of the partition away from the straight portion.

3. The lower box according to claim 1, characterized in that: The plurality of spliced ​​beams constituting the box frame include: A plurality of frame beams, forming the outer perimeter of the box frame; The cross beam and the longitudinal beam are arranged inside the plurality of frame beams; Wherein, an adapter bracket is provided at the end of the cross beam to be connected to the frame beam through the adapter bracket; and / or an adapter bracket is provided at the end of the longitudinal beam to be connected to the cross beam or the frame beam through the adapter bracket.

4. The lower box according to claim 3, characterized in that: The adapter bracket includes a first part and a second part which are connected together, wherein the first part is sleeved on the end of the cross beam, and the second part is closely connected to the side wall of the frame beam.

5. The lower box according to claim 3, characterized in that: The longitudinal beam comprises a plurality of sub-longitudinal beams parallel to the extension direction of the longitudinal beam, and adjacent sub-longitudinal beams are fixedly connected by connecting rods.

6. The lower box according to any one of claims 1 to 5, characterized in that: The bottom of the box frame is sealed with a cold plate; the bottom of the cold plate is sealed with a bottom guard plate.

7. The lower box according to claim 6, characterized in that: The cold plate is riveted to the box frame; a first insulating seal is provided between the cold plate and the box frame; and / or, The bottom guard plate is threadedly connected to the box frame; a second insulating seal is arranged between the bottom guard plate and the cold plate.

8. The lower box according to claim 6, characterized in that: A second insulating seal is provided between the bottom guard plate and the cold plate; A limiting member is provided on a side surface of the cold plate away from the box frame, and the second insulating seal is limited at the periphery of the limiting member so that the second insulating seal is positioned between the bottom guard plate and the cold plate.

9. The lower box according to claim 6, characterized in that: A buffer is provided between the cold plate and the bottom guard plate; wherein: The buffer member is an elastic pad; and / or, A buffer limiting structure is provided on a side surface of the bottom guard plate close to the cold plate, and the buffer member is limited in the buffer limiting structure; and / or, The bottom guard plate is provided with reinforcing ribs.

10. A battery pack, characterized in that: The invention comprises the lower box body according to any one of claims 1 to 9.

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