Battery pack shell, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack shell of a battery pack, the battery pack and electric equipment, the battery pack shell comprises a first shell and a second shell, the first shell comprises a peripheral wall, a shell connecting part is formed on the peripheral wall, and part of the second shell is connected to the shell connecting part. According to the embodiment of the invention, the connection strength of the battery pack shell can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack housing, a battery pack, and an electrical device. Background Technology

[0002] The dual-layer battery pack structure can meet the needs of related devices for high power or long battery life. The tray of the upper battery pack is fixedly connected to the lower battery pack through a support module. The connection strength is weak, and the upper battery pack is prone to swinging, which affects the stability and safety of the dual-layer battery pack. Utility Model Content

[0003] This application provides a battery pack housing, a battery pack, and an electrical device, which can improve the connection strength of the battery pack housing.

[0004] The first aspect of this application provides a battery pack housing for a battery pack, comprising:

[0005] A first housing includes a peripheral wall, on which a housing connection portion is formed, and the first housing is used to support a first battery pack;

[0006] And a second housing, which is stacked on top of the first housing, with a portion of the second housing connected to the housing connection portion, the second housing being used to support the second battery pack.

[0007] According to the battery pack housing described in the first aspect of this application, the second housing can be connected to the housing connection portion of the first housing, which can improve the connection strength between the first housing and the second housing, thereby improving the overall structural strength of the battery pack.

[0008] In one possible implementation, the housing connection extends continuously along the circumferential wall.

[0009] In one possible implementation, the housing connection extends circumferentially at intervals on the peripheral wall.

[0010] In one possible implementation, the peripheral wall includes:

[0011] The housing connection portion includes a first housing connection portion disposed on the first sidewall and a second housing connection portion disposed on the second sidewall, which are arranged opposite to each other.

[0012] In one possible implementation, the peripheral wall further includes:

[0013] A third sidewall and a fourth sidewall are disposed opposite to each other, and the third sidewall and the fourth sidewall are connected between the first sidewall and the second sidewall.

[0014] In one possible implementation, a third housing connection portion is provided on the third sidewall, and a fourth housing connection portion is provided on the fourth sidewall.

[0015] In one possible implementation, the first housing connection, the second housing connection, the third housing connection, and the fourth housing connection are flush with each other on a horizontal plane.

[0016] In one possible implementation, the peripheral wall includes:

[0017] Outer structural part;

[0018] And an inner layer structure portion, wherein the inner top surface of the inner layer structure portion is lower than the outer top surface of the outer layer structure portion to form the shell connection portion between the inner layer structure portion and the outer layer structure portion.

[0019] In one possible implementation, a first mounting hole is provided on the top surface of the inner layer, and a second mounting hole is provided corresponding to the first mounting hole in the second housing. The battery pack housing also includes a connecting fastener that can pass through the first mounting hole and the second mounting hole to connect the second housing to the housing connection portion.

[0020] In one possible implementation, a third mounting hole is provided on the top surface of the outer layer for mounting the cap.

[0021] In one possible implementation, a protrusion is formed on the periphery of the third mounting hole.

[0022] In one possible implementation, the outer top surface is provided with a lug protrusion for connection to the vehicle.

[0023] In one possible implementation, the housing connection is a groove, rib, or boss formed on the peripheral wall.

[0024] In one possible implementation, the first housing further includes:

[0025] A first cold plate is connected to the side of the peripheral wall away from the second housing to enclose and form a first inner cavity for accommodating the first battery pack.

[0026] In one possible implementation, the first housing further includes:

[0027] A separator is disposed within the peripheral wall and connected to the peripheral wall.

[0028] In one possible implementation, the second housing includes:

[0029] Second shell body;

[0030] And a side beam, connected to at least one side of the second housing body, the side beam being disposed on the step.

[0031] In one possible implementation, the step is provided with first limiting protrusions at intervals, and the side beam is provided with limiting grooves at intervals, with the first limiting protrusions disposed in the limiting grooves.

[0032] In one possible implementation, the first limiting protrusion is connected to the outer structural portion.

[0033] In one possible implementation, the side beam includes a connecting portion and a flange, the connecting portion being connected to the flange and the second housing body, the flange being connected to the step, and the flange being provided with the limiting groove.

[0034] In one possible implementation, the side beam further includes a transition section connecting the connecting portion and the flange, the transition section being inclined downwards to reduce the height of the top surface of the flange.

[0035] In one possible implementation, the side beam includes a first side beam and a second side beam disposed opposite to each other, and the flange includes a first flange connected to the first side beam and a second flange connected to the second side beam, wherein the first flange and the second flange are provided with limiting grooves.

[0036] In one possible implementation, the second housing body includes:

[0037] The second cold plate is connected to the first side beam and the second side beam.

[0038] In one possible implementation, the second housing further includes:

[0039] Multiple expansion beams are spaced apart on the second housing body and / or the side beams to form at least one second inner cavity on the second housing body.

[0040] In one possible implementation, part of the expansion beam includes:

[0041] First expansion section;

[0042] Second expansion section;

[0043] The first expansion portion and the second expansion portion are separated, and the fixing portion is connected between the first expansion portion and the second expansion portion.

[0044] A second aspect of this application provides a battery pack, comprising:

[0045] Battery pack casing;

[0046] The first battery pack is mounted on the first housing;

[0047] The second battery pack is mounted on the second housing.

[0048] According to the battery pack described in the second aspect of this application, the first housing and the first battery pack in the battery pack can form a first battery pack, and the second housing and the second battery pack in the battery pack can form a second battery pack. A combined battery pack structure can be formed by connecting the first housing and the second housing. Since the combined battery pack structure adopts a battery pack housing including the first housing and the second housing, it can improve the overall structural strength of the battery pack, thereby improving the stability and safety of the battery pack.

[0049] In one possible implementation, a cap is also included, wherein the peripheral wall comprises:

[0050] Outer structural part;

[0051] The inner layer structure has an inner top surface that is lower than the outer top surface of the outer layer structure to form the shell connection between the inner and outer layers, and the cap is connected to the outer top surface.

[0052] In one possible implementation, a third mounting hole is provided on the top surface of the outer layer, and a protrusion is formed on the periphery of the third mounting hole, the protrusion abutting against the cover. The battery pack also includes a fastener that passes through the cover and the third mounting hole to connect the cover and the first housing.

[0053] In one possible implementation, the battery pack further includes:

[0054] A sealing element is disposed between the cap and the top surface of the outer layer, and the sealing element wraps around the outer periphery of the protrusion.

[0055] In one possible implementation, the battery pack further includes:

[0056] A pressure plate, wherein the fastener passes sequentially through the pressure plate, the cover, and the third mounting hole to press the pressure plate onto the cover.

[0057] A third aspect of this application provides an electrical device including the aforementioned battery pack. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 An exploded schematic diagram of a battery pack according to an embodiment of this application is shown;

[0060] Figure 2 A cross-sectional view of a battery pack provided according to an embodiment of this application is shown;

[0061] Figure 3 It shows Figure 2 A magnified view of part A in the middle;

[0062] Figure 4 A schematic diagram of the structure of a first housing provided according to an embodiment of this application is shown;

[0063] Figure 5 A partially enlarged view of a first housing provided according to an embodiment of this application is shown;

[0064] Figure 6 A schematic diagram of a second housing provided according to an embodiment of this application is shown;

[0065] Figure 7 A partially enlarged view of a second housing provided according to an embodiment of this application is shown.

[0066] Figure label:

[0067] 100-First housing; 101-First inner cavity; 110-Peripheral wall; 120-First cold plate; 130-Separator; 111-Housing connection; 111a-First housing connection; 111b-Second housing connection; 111c-First limiting protrusion; 111d-Avoidance area; 112-Outer layer structure; 113-Inner layer structure; 114-First side wall; 115-Second side wall; 116-Third side wall; 117-Fourth side wall; 1111-Step; 1121-Outer top surface; 1131-Inner top surface; 1121a-Third mounting hole; 1121b-Protrusion; 1121c-Lifting lug protrusion; 1131a-First mounting hole;

[0068] 200 - Second housing; 201 - Second inner cavity; 202 - Second mounting hole; 203 - Limiting groove; 210 - Second limiting protrusion; 220 - Second housing body; 230 - Side beam; 230a - First side beam; 230b - Second side beam; 223 - Expansion beam; 224 - Second cold plate; 225 - Flange; 225a - First flange; 225b - Second flange; 2231 - First expansion part; 2232 - Second expansion part; 2233 - Fixing part; 2251 - Connecting part; 2252 - Transition part;

[0069] 300 - First battery pack;

[0070] 400 - Second battery pack;

[0071] 500 - Cap;

[0072] 600 - Fasteners;

[0073] 700 - Seals;

[0074] 800-Pressure Plate;

[0075] 900 - Connecting fasteners;

[0076] 10-Battery pack casing;

[0077] 20-Battery pack. Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0079] To increase the battery pack's capacity to meet the high power or long battery life requirements of relevant electrical equipment, a modular battery pack structure can be adopted. The tray of the upper battery pack is fixedly connected to the lower battery pack through a support module. For example, a cooling structure can be used as a support module to connect the upper and lower battery packs.

[0080] The aforementioned dual-layer battery pack typically includes an upper battery pack, a lower battery pack, and a cooling structure positioned between them. This cooling structure acts as an intermediate transition, connecting the upper and lower battery packs. In this dual-layer battery pack structure, the upper and lower battery packs are separated, and the connection point between them lacks restraint. This affects the connection strength at the joint, making the upper battery pack prone to swaying, thus impacting the stability and safety of the dual-layer battery pack.

[0081] Based on the above-mentioned situation and problems, this application provides a battery pack, which can be a double-layer battery pack or a multi-layer battery pack. The battery pack is equipped with a battery pack shell. By splicing the battery pack shell, the connection strength of the battery pack can be improved, thereby improving the stability and safety of the battery pack.

[0082] In the embodiments of this application, the battery pack housing is a combination of at least two housings, one housing can be connected to the other housing, and the connection between the two housings can be a nested connection, for example, the former can be nested in the latter, thereby the latter can provide a circumferential envelope surface for the former to circumferentially restrain the connection position, which can improve the structural strength of the battery pack housing at the connection position.

[0083] Of course, in other embodiments, the connection between the two housings can also be achieved in other ways, such as by screws, snap-fit, etc. The housing connection part 111 can be a groove, rib, or boss formed on the peripheral wall 110.

[0084] The battery pack in this embodiment can be applied to electrical equipment such as new energy vehicles, and can provide higher power to the electrical equipment and improve its range.

[0085] Figure 1 An exploded schematic diagram of a battery pack according to an embodiment of this application is shown; Figure 2 A cross-sectional view of a battery pack provided according to an embodiment of this application is shown; Figure 3 It shows Figure 2 A magnified view of part A in the image.

[0086] In the embodiments of this application, please refer to Figure 1 The battery pack 20 includes the battery pack housing 10 described above. The battery pack housing 10 may include a first housing 100, a second housing 200, a first battery pack 300, and a second battery pack 400. The first battery pack 300 is disposed on the first housing 100, and the second battery pack 400 is disposed on the second housing 200. In some embodiments, the battery pack 20 may also include a cover 500.

[0087] In the battery pack 20, the first battery group 300 and the first housing 100 can form a first battery pack, and the second housing 200 and the second battery group 400 can form a second battery pack. The first battery pack and the second battery pack are connected through the first housing 100 and the second housing 200.

[0088] The first housing 100 serves as a protective housing for the first battery pack 300 and may be made of aluminum. The first housing 100 includes a peripheral wall 110, on which a housing connection portion 111 is formed, and the first housing 100 has a first inner cavity 101.

[0089] It is understood that the peripheral wall 110 is a circumferential surrounding structure of the first housing 100. In addition, the first housing 100 may also include a bottom wall, which may be formed by the first cold plate 120 in the following embodiment. The peripheral wall 110 and the bottom wall may form a first inner cavity 101, in which the first battery pack 300 may be disposed.

[0090] The second housing 200 serves as a protective housing for the second battery pack 400 and may be made of aluminum. The second housing 200 is connected to the housing connection portion 111 and has a second inner cavity 201. Of course, in some embodiments, the second housing 200 may not have a second inner cavity 201.

[0091] It is understood that the second housing 200 can be designed according to the first housing 100. The second housing 200 can be an enclosed structure or other structures. The second battery pack 400 can be disposed in the second inner cavity 201.

[0092] The second housing 200 can be connected to the housing connection portion 111 of the first housing 100. For example, the aforementioned nesting method can be adopted, and the joint position between the first housing 100 and the second housing 200 can be hidden inside the first housing 100. The first housing 100 can form an envelope surface for the joint position, which can improve the connection strength between the first housing 100 and the second housing 200.

[0093] The cover 500 seals and covers the first housing 100. The combination of the cover 500 and the first housing 100 can protect the second housing 200, the second battery pack 400, the first battery pack 300, etc., and can isolate the internal space of the battery pack from the outside.

[0094] In this embodiment of the application, the first housing 100 and the first battery pack 300 in the battery pack can form a first battery pack, and the second housing 200 and the second battery pack 400 in the battery pack can form a second battery pack. The combined battery pack structure can be formed by connecting the first housing 100 and the second housing 200. Since the combined battery pack structure adopts the battery pack housing 10 including the first housing 100 and the second housing 200, it can improve the overall structural strength of the battery pack, thereby improving the stability and safety of the battery pack.

[0095] Furthermore, by employing the aforementioned nested assembly method, such as incorporating a portion of the second housing 200 into the first housing 100, the battery pack can be made more structurally compact, thereby reducing the space occupied by the battery pack.

[0096] In some embodiments, please refer to Figure 2 and Figure 3 The peripheral wall 110 includes an outer structural portion 112 and an inner structural portion 113. The inner top surface 1131 of the inner structural portion 113 is lower than the outer top surface 1121 of the outer structural portion 112 to form a shell connection portion 111 between the inner structural portion 113 and the outer structural portion 112. The shell connection portion 111 is a step 1111, and the cover 500 is connected to the outer top surface 1121.

[0097] The inner structural part 113 and the outer structural part 112 are two components of the peripheral wall 110, arranged from the inside out. These two components can be integrally formed or formed separately. (See reference...) Figure 1 In the coordinate system shown, the height of the inner structure 113 in the Z direction is lower than the height of the outer structure 112 in the Z direction. Based on the height difference between the two, the aforementioned shell connection 111 can be formed. The second shell 200 is connected to the shell connection 111, and the cover 500 is connected to the outer top surface 1121.

[0098] In some embodiments, please refer to Figure 3 The outer top surface 1121 is provided with a third mounting hole 1121a, and a protrusion 1121b is formed around the periphery of the third mounting hole 1121a. The protrusion 1121b abuts against the cover 500. The battery pack also includes a fastener 600, which passes through the cover 500 and the third mounting hole 1121a to connect the cover 500 and the first housing 100.

[0099] The protrusion 1121b is provided around the edge of the third mounting hole 1121a. Specifically, the third mounting hole 1121a has an opening on the outer top surface 1121, and the protrusion 1121b is provided around the opening. A wire threaded sleeve can be installed in the third mounting hole 1121a. The fastener 600 can be a screw. The cover 500 can be connected to the protrusion 1121b by screwing the screw into the third mounting hole 1121a.

[0100] The cover 500 is connected to the protrusion 1121b to support the cover 500. A gap can be formed between the cover 500 and the outer top surface 1121. By setting the seal 700 in the gap, the sealing effect between the cover 500 and the first housing 100 can be effectively improved.

[0101] In some specific embodiments, please refer to Figure 3 The battery pack may also include a seal 700, which is disposed between the cover 500 and the outer top surface 1121. The seal 700 may be made of materials such as sealing foam or sealing rubber.

[0102] It is understandable that during the process of installing the sealing fastener 600 into the third mounting hole 1121a, the cover 500 will squeeze the seal 700, so that the seal 700 is compressed between the outer top surface 1121 and the cover 500. It is known that the amount of compression of the seal 700 can be changed by controlling the height of the boss, thereby achieving a seal between the cover 500 and the first housing 100.

[0103] Furthermore, the sealing element 700 surrounding the boss can provide an installation reference for the assembly of the sealing element 700. For example, the sealing element 700 can be first fitted onto the outer periphery of the boss, and then the cover 500 and the sealing fastener 600 can be assembled in sequence. Due to the presence of the boss, the installation of the sealing element 700 can be simplified, and the sealing element 700 can be prevented from slipping during the assembly process.

[0104] In some embodiments, please refer to Figure 3 The battery pack may also include a pressure plate 800, which is disposed on the cover 500. The fastener 600 can pass through the pressure plate 800 and the cover 500 and be locked into the third mounting hole 1121a. The pressure plate 800 can serve as a transition structure between the sealing fastener 600 and the cover 500, which can prevent the sealing fastener 600 from directly acting on the cover 500 and damaging the cover 500.

[0105] Figure 4 A schematic diagram of the structure of a first housing provided according to an embodiment of this application is shown; Figure 5 A partially enlarged view of a first housing provided according to an embodiment of this application is shown; Figure 6 A schematic diagram of a second housing provided according to an embodiment of this application is shown; Figure 7 A partially enlarged view of a second housing provided according to an embodiment of this application is shown.

[0106] In the embodiments of this application, please refer to Figures 4 to 7 The battery pack housing includes a first housing 100 and a second housing 200. The first housing 100 includes a peripheral wall 110, and a housing connection portion 111 is formed on the inner side of the peripheral wall 110. The first housing 100 is used to support the first battery pack 300. The second housing 200 overlaps with the first housing 100, and a portion of the second housing 200 is connected to the housing connection portion 111. The second housing 200 is used to support the second battery pack 400.

[0107] In this embodiment, the second housing 200 can be connected to the housing connection portion 111 of the first housing 100, which can improve the connection strength between the first housing 100 and the second housing 200, thereby improving the overall structural strength of the battery pack.

[0108] In some embodiments, the housing connection portion 111 extends continuously along the circumferential direction on the peripheral wall 110, that is, the housing connection portion 111 has a full-circle structure on the peripheral wall 110.

[0109] In some embodiments, please refer to Figure 4 The shell connecting part 111 extends circumferentially on the peripheral wall 110 at intervals, that is, the shell connecting part 111 has an intermittent structure on the peripheral wall 110.

[0110] It should be noted that, in the embodiments of this application, continuous extension and discontinuous extension can be selected according to actual needs. For example, when the second housing 200 adopts an enclosing structure, continuous extension can be selected, and when the second housing 200 adopts other structures, discontinuous extension can be selected. The other structures can be referred to in the following embodiments of the relevant second housing 200.

[0111] In some embodiments, please refer to Figure 4 and Figure 5 The peripheral wall 110 includes a first side wall 114 and a second side wall 115 disposed opposite to each other, and the housing connection portion 111 includes a first housing connection portion 111a disposed on the first side wall 114 and a second housing connection portion 111b disposed on the second side wall 115.

[0112] At this time, the shell connection 111 formed by the first shell connection 111a and the second shell connection 111b is an intermittent structure.

[0113] In some embodiments, please refer to Figure 4The peripheral wall 110 may also include a third side wall 116 and a fourth side wall 117 disposed opposite to each other, the third side wall 116 and the fourth side wall 117 being connected between the first side wall 114 and the second side wall 115.

[0114] Therefore, the first sidewall 114, the second sidewall 115, the third sidewall 116 and the fourth sidewall 117 can form a cuboid-shaped peripheral wall 110, and based on this, the first battery pack can be designed as a cuboid structure.

[0115] In some embodiments, a third housing connection portion is provided on the third sidewall 116, and a fourth housing connection portion is provided on the fourth sidewall 117. The first housing connection portion 111a, the second housing connection portion 111b, the third housing connection portion and the fourth housing connection portion are flush on the horizontal plane. At this time, the housing connection portion 111 formed by the first housing connection portion 111a, the second housing connection portion 111b, the third housing connection portion and the fourth housing connection portion is a complete ring structure.

[0116] Of course, in other embodiments, the peripheral wall 110 may also be constructed in other structures, and this application does not impose any particular restrictions on the specific structure of the peripheral wall 110.

[0117] In some embodiments, the housing connection portion 111 may be a step 1111 formed on the inner side of the peripheral wall 110, so that the second housing 200 can be embedded in the first housing 100. For example, the step 1111 can be formed by combining the outer structural portion 112 and the inner structural portion 113 in the above embodiments. The following embodiments mainly use the step 1111 as an example to describe the housing connection portion 111.

[0118] In some embodiments, please refer to Figure 4 and Figure 5 The inner top surface 1131 is provided with a first mounting hole 1131a, and the second housing 200 is provided with a second mounting hole 202 corresponding to the first mounting hole 1131a. The battery pack housing also includes a connecting fastener 900, which can pass through the first mounting hole 1131a and the second mounting hole 202 to connect the second housing 200 to the step 1111.

[0119] The fastener 900 can be a screw, and a wire threaded sleeve can be installed in the first mounting hole 1131a. The fastener 900 can be installed on the first housing 100 by passing through the second mounting hole 202 on the second housing 200 and the first mounting hole 1131a on the inner top surface 1131 in sequence.

[0120] In some embodiments, please refer to Figure 4 and Figure 5A lifting lug protrusion 1121c is provided on the outer top surface 1121 for connection to the vehicle. The lifting lug protrusion 1121c protrudes from the outer top surface 1121. (Refer to reference) Figure 2 The lifting lug protrusion 1121c can pass through the cover 500, and the battery pack in this embodiment can be lifted onto the vehicle through the lifting lug protrusion 1121c.

[0121] In some embodiments, please refer to the foregoing description. Figure 4 and Figure 5 The first housing 100 may also include a first cold plate 120, which is connected to the side of the peripheral wall 110 away from the second housing 200 to enclose and form a first inner cavity 101 for accommodating the first battery pack 300. The first cold plate 120 can dissipate heat from the first battery pack 300 in the first housing 100. The first battery pack 300 can be connected to the first cold plate 120 by thermally conductive adhesive. The first cold plate 120 can serve as the bottom wall of the first housing 100.

[0122] The first cold plate 120 can adopt a straight cold plate structure or other structures, and its internal flow channel is provided. The first battery pack 300 can be cooled by the flow of refrigerant in the flow channel. The specific structure of the first cold plate 120 can refer to existing designs. In order to realize the connection between the first cold plate 120 and the peripheral wall 110, mounting holes, fasteners, sealant and other structures can be provided on the edge of the first cold plate 120.

[0123] In some embodiments, please refer to Figure 4 and Figure 5 The first housing 100 also includes a partition 130, which is disposed within and connected to the peripheral wall 110.

[0124] The separator 130 can enhance the overall strength of the first housing 100 and also isolate the first battery pack 300, thereby preventing problems such as insufficient restraint or uneven cell distribution caused by the first battery pack 300 being too long.

[0125] In some embodiments, please refer to Figure 6 and Figure 7 The second housing 200 includes a second housing body 220 and a side beam 230, which is connected to at least one side of the second housing body 220 and is disposed on the step (1111).

[0126] The second housing body 220 can form a second inner cavity 201 capable of accommodating the second battery pack 400. The flange 225 can extend in a direction away from the second inner cavity 201. The flange 225 can be provided on the housing connection portion 111.

[0127] In conjunction with the foregoing, the aforementioned second mounting hole 202, second limiting protrusion 210, and limiting groove 203 can be provided on the flange 225.

[0128] In some embodiments, please refer to Figure 4 and Figure 5 The step 1111 is provided with first limiting protrusions 111c at intervals, and the side beam 230 is provided with limiting grooves 203 at intervals, with the first limiting protrusions 111c being disposed in the limiting grooves 203.

[0129] Understandably, you can refer to this first. Figure 5 Since first limiting protrusions 111c are provided at intervals on step 1111, the two first limiting protrusions 111c will form an avoidance zone 111d, then refer to Figure 7 Since the second housing 200 is provided with limiting grooves 203 at intervals, a second limiting protrusion 210 is formed between the two limiting grooves 203. After the second housing 200 is installed on the housing connecting part 111, the first limiting protrusion 111c can be restricted in the limiting groove 203, and the second limiting protrusion 210 can be restricted in the clearance area 111d. The first limiting protrusion 111c and the second limiting protrusion 210 can be alternately and mutually limited, thereby limiting the second housing 200 and preventing the second housing 200 from falling off the step 1111.

[0130] In some specific embodiments, please refer to Figure 5 The first limiting protrusion 111c is connected to the outer structural part 112, and thus the first limiting protrusion 111c can also serve as a reinforcing rib to improve the structural strength of the first shell 100.

[0131] In addition to the above, a third mounting hole 1121a is also provided on the outer top surface 1121. This third mounting hole 1121a is used to install the cover 500. For specific installation methods, please refer to the previous text. A protrusion 1121b is formed around the periphery of the third mounting hole 1121a. The function of the protrusion 1121b has been described in detail in the previous text and will not be repeated here.

[0132] In some embodiments, please refer to Figure 7 The side beam 230 includes a connecting part 2251 and a flange 225. The connecting part 2251 is connected to the flange 225, and the flange 225 is connected to the step 1111. A limiting groove 203 is provided on the flange 225.

[0133] The connecting part 2251 can be connected to the second housing body 220, and the flange 225 is connected to the outside of the connecting part 2251, so that when the second housing 200 is assembled into the first housing 100, the first limiting protrusion 111c can be restricted in the limiting groove 203.

[0134] In some embodiments, please refer to Figure 7 The side beam also includes a transition portion 2252, which connects the connecting portion 2251 and the flange 225. The transition portion 2252 is inclined from top to bottom to reduce the height of the top surface of the flange 225.

[0135] By providing the transition section 2252, the height of the top surface of the flange can be designed to be lower than the height of the outer top surface 1121, which can avoid interfering with the installation of the cover 500 on the outer top surface 1121 after the second housing 200 is installed on the first housing 100.

[0136] In some embodiments, please refer to Figure 6 and Figure 7 The side beam 230 includes a first side beam 230a and a second side beam 230b arranged opposite to each other. The first side beam 230a includes a first flange 225a, and the second side beam 230b includes a second flange 225b. Limiting grooves 203 are provided on the first flange 225a and the second flange 225b.

[0137] As described above, the first flange 225a and the second flange 225b can be connected to the steps 1111 respectively. It can be understood that two steps 1111 are formed opposite to each other on the peripheral wall 110 to accommodate the first flange 225a and the second flange 225b respectively. The two steps 1111 can be formed by opposing first sidewalls 114 and 115, i.e., the first sidewall 114 and the second sidewall 115 are respectively provided with the aforementioned outer structural portion 112 and inner structural portion 113.

[0138] In some embodiments, please refer to Figure 6 The second housing body 220 also includes a second cold plate 224, which is connected to the first side beam 230a and the second side beam 230b.

[0139] The second cold plate 224 can adopt a structure similar to the aforementioned first cold plate 120. The second cold plate 224 can be a straight cold plate structure or other structures, and its interior is provided with flow channels. The first battery pack 300 can be cooled by the flow of refrigerant in the flow channels. The specific structure of the second cold plate 224 can refer to existing designs. In order to realize the connection between the second cold plate 224 and the peripheral wall 110, mounting holes, fasteners, sealant and other structures can be provided on the edge of the second cold plate 224.

[0140] In some embodiments, please refer to Figure 6 The second housing 200 also includes a plurality of expansion beams 223, which are spaced apart on the second cold plate 224 and / or side beams 230 to form at least one second inner cavity 201 on the second housing body 220.

[0141] exist Figure 6 In the example shown, four expansion beams 223 are spaced apart along the aforementioned length direction, forming three second inner cavities. There can be three second battery packs 400, with each second battery pack 400 correspondingly disposed in one of the second inner cavities 201.

[0142] The expansion beam 223 can provide a small deformation space for the second battery pack 400. The expansion beam 223 can be made of a material with high strength and capable of undergoing a certain degree of elastic deformation. When the second battery pack 400 is in a charging cycle, the expansion beam 223 can restrict the second battery pack 400 while providing the above-mentioned deformation space, and can prevent the second battery pack 400 from expanding excessively.

[0143] In some embodiments, please refer to Figure 6 Some expansion beams 223 may include a first expansion portion 2231, a second expansion portion 2232, and a fixing portion 2233. The first expansion portion 2231 and the second expansion portion 2232 are spaced apart, and the fixing portion 2233 is connected between the first expansion portion 2231 and the second expansion portion 2232.

[0144] Understandably, the aforementioned structure of the expansion beam 223 provides a large deformation space for the second battery pack 400.

[0145] Furthermore, in conjunction with the aforementioned structural form of the expansion beam 223, after the second battery pack 400 is installed into the second housing 200, each of the second battery packs 400 can form a clearance position to avoid the vehicle longitudinal beam. At this time, by designing the cover 500 to match the arrangement of the second battery pack 400 as described above, the cover 500 can also avoid the vehicle longitudinal beam. The resulting battery pack can make full use of the space between the vehicle longitudinal beams and increase the capacity of the battery pack.

[0146] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0147] In the description of this application, it should be understood that the terms "comprising" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0148] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack housing (10), characterized in that, include: The first housing (100) includes a peripheral wall (110) on which a housing connection portion (111) is formed, and the first housing (100) is used to support the first battery pack (300); And a second housing (200) is stacked on top of the first housing (100), a portion of the second housing (200) is connected to the housing connection portion (111), and the second housing (200) is used to support the second battery pack (400).

2. The battery pack housing (10) according to claim 1, characterized in that, The housing connection portion (111) extends continuously along the circumferential direction on the peripheral wall (110).

3. The battery pack housing (10) according to claim 1, characterized in that, The housing connection portion (111) extends circumferentially on the peripheral wall (110).

4. The battery pack housing (10) according to claim 3, characterized in that, The peripheral wall (110) includes: The housing connection portion (111) includes a first housing connection portion (111a) disposed on the first sidewall (114) and a second housing connection portion (111b) disposed on the second sidewall (115).

5. The battery pack housing (10) according to claim 4, characterized in that, The peripheral wall (110) also includes: A third sidewall (116) and a fourth sidewall (117) are disposed opposite to each other, the third sidewall (116) and the fourth sidewall (117) being connected between the first sidewall (114) and the second sidewall (115).

6. The battery pack housing (10) according to claim 5, characterized in that, A third housing connection portion is provided on the third sidewall (116), and a fourth housing connection portion is provided on the fourth sidewall (117).

7. The battery pack housing according to claim 6, characterized in that, The first housing connection portion (111a), the second housing connection portion (111b), the third housing connection portion, and the fourth housing connection portion are flush with each other on the horizontal plane.

8. The battery pack housing according to claim 1, characterized in that, The housing connection (111) is a step (1111) formed on the inner side of the peripheral wall (110).

9. The battery pack housing (10) according to claim 8, characterized in that, The peripheral wall (110) includes: Outer structural part (112); And an inner layer structure (113), the inner top surface (1131) of which is lower than the outer top surface (1121) of the outer layer structure (112) to form the step (1111) between the inner layer structure (113) and the outer layer structure (112).

10. The battery pack housing (10) according to claim 9, characterized in that, The inner top surface (1131) is provided with a first mounting hole (1131a), and the second housing (200) is provided with a second mounting hole (202) corresponding to the first mounting hole (1131a). The battery pack housing also includes a connecting fastener (900), which can pass through the first mounting hole (1131a) and the second mounting hole (202) to connect the second housing (200) to the step (1111).

11. The battery pack housing (10) according to claim 9, characterized in that, A third mounting hole (1121a) is provided on the top surface (1121) of the outer layer for mounting the cover (500).

12. The battery pack housing (10) according to claim 11, characterized in that, A protrusion (1121b) is formed on the periphery of the third mounting hole (1121a).

13. The battery pack housing (10) according to claim 9, characterized in that, The outer top surface (1121) is provided with a lug protrusion (1121c) for connecting to the vehicle.

14. The battery pack housing (10) according to claim 1, characterized in that, The housing connection part (111) is a groove, rib or boss formed on the peripheral wall (110).

15. The battery pack housing (10) according to any one of claims 1 to 14, characterized in that, The first housing (100) further includes: A first cold plate (120) is connected to the side of the peripheral wall (110) away from the second housing (200) to enclose and form a first inner cavity (101) for accommodating the first battery pack (300).

16. The battery pack housing (10) according to any one of claims 1 to 14, characterized in that, The first housing (100) further includes: A separator (130) is disposed within the peripheral wall (110) and connected to the peripheral wall (110).

17. The battery pack housing (10) according to any one of claims 9 to 13, characterized in that, The second housing (200) includes: Second shell body (220); And a side beam (230) connected to at least one side of the second housing body (220), the side beam (230) being disposed on the step (1111).

18. The battery pack housing (10) according to claim 17, characterized in that, The step (1111) is provided with a first limiting protrusion (111c) at intervals, and the side beam (230) is provided with a limiting groove (203) at intervals, and the first limiting protrusion (111c) is disposed in the limiting groove (203).

19. The battery pack housing (10) according to claim 18, characterized in that, The first limiting protrusion (111c) is connected to the outer structure portion (112).

20. The battery pack housing (10) according to claim 18, characterized in that, The side beam (230) includes a connecting part (2251) and a flange (225). The connecting part (2251) is connected to the flange (225) and the second housing body (220). The flange (225) is connected to the step (1111). The flange (225) is provided with the limiting groove (203).

21. The battery pack housing (10) according to claim 20, characterized in that, The side beam (230) also includes a transition portion (2252), which is connected between the connecting portion (2251) and the flange (225), and the transition portion (2252) is inclined from top to bottom.

22. The battery pack housing (10) according to claim 20, characterized in that, The side beam (230) includes a first side beam (230a) and a second side beam (230b) disposed opposite to each other. The first side beam (230a) includes a first flange (225a), and the second side beam (230b) includes a second flange (225b). Limiting grooves (203) are provided on the first flange (225a) and the second flange (225b).

23. The battery pack housing (10) according to claim 22, characterized in that, The second housing body (220) includes: The second cold plate (224) is connected to the first side beam (230a) and the second side beam (230b).

24. The battery pack housing (10) according to claim 17, characterized in that, The second housing (200) further includes: Multiple expansion beams (223) are spaced apart on the second housing body (220) and / or the side beams (230) to form at least one second inner cavity (201) on the second housing body (220).

25. The battery pack housing (10) according to claim 24, characterized in that, The expansion beam (223) described in part includes: First expansion section (2231); Second expansion section (2232); And a fixing part (2233) connected to the second housing body (220), the first expansion part (2231) and the second expansion part (2232) are spaced apart, and the fixing part (2233) is connected between the first expansion part (2231) and the second expansion part (2232).

26. A battery pack (20), characterized in that, include: The battery pack housing (10) according to any one of claims 1-25; The first battery pack (300) is disposed on the first housing (100); The second battery pack (400) is disposed on the second housing (200).

27. The battery pack (20) according to claim 26, characterized in that, It also includes a cap (500), the peripheral wall (110) comprising: Outer structural part (112); And an inner layer structure (113), the inner top surface (1131) of which is lower than the outer top surface (1121) of the outer layer structure (112) to form the shell connection (111) between the inner layer structure (113) and the outer layer structure (112), and the cover (500) is connected to the outer top surface (1121).

28. The battery pack (20) according to claim 27, characterized in that, A third mounting hole (1121a) is provided on the top surface (1121) of the outer layer. A protrusion (1121b) is formed on the periphery of the third mounting hole (1121a). The protrusion (1121b) abuts against the cover (500). The battery pack also includes a fastener (600) that passes through the cover (500) and the third mounting hole (1121a) to connect the cover (500) and the first housing (100).

29. The battery pack (20) according to claim 28, characterized in that, The battery pack (20) also includes: A seal (700) is disposed between the cover (500) and the outer top surface (1121), the seal (700) wrapping around the outer periphery of the protrusion (1121b).

30. The battery pack (20) according to claim 28, characterized in that, The battery pack (20) also includes: A pressure plate (800) is provided, and the fastener (600) passes through the pressure plate (800), the cover (500) and the third mounting hole (1121a) in sequence to press the pressure plate (800) onto the cover (500).

31. An electrical appliance, characterized in that, The battery pack includes any one of claims 26 to 30.

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