Battery pack box body and battery pack

Abstract

The utility model provides a battery pack box body and a battery pack, the battery pack box body comprises a lower box body, the lower box body comprises a first end plate, a second end plate, two side plates and two corner beams, each side plate is provided with a first end and a second end along the extension direction, the first end is connected with the first end plate through the corner beams, and the second end is connected with the second end plate, so that a frame structure is defined; the corner beam is provided with a first connecting part; the distance between the surfaces, deviating from each other, of the two side plates is different from the distance between the exposed surfaces, deviating from each other, of the two corner beams. According to the battery pack box body and the battery pack provided by the invention, the lower box body is provided with the part with the larger width and the part with the smaller width, and the width size of each part of the lower box body can be separately designed according to the size of a vehicle chassis, so that more battery cells can be accommodated in the battery pack box body, and the cruising ability of the battery pack is improved; and the corner beams have the function of connecting and fixing other components in the battery pack, so that the structure in the battery pack is more compact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a battery pack box and a battery pack. BACKGROUND

[0002] With the rapid development of new energy vehicles, the energy density and the endurance capability of the battery pack as the power source of the new energy vehicles are the main concerns in the current new energy market.

[0003] In the related art, the battery pack is usually arranged on the vehicle chassis. The middle part of the vehicle chassis is usually a regular rectangular area. In order to arrange the wheels, the area adjacent to the rectangular area (hereinafter referred to as the wheel area) is relatively small in width. Usually, the orthographic projection shape of the battery pack box is a regular rectangle, which makes it only be arranged in the middle part of the vehicle chassis and unable to extend to the wheel area with varying width. Therefore, in order to adapt to the vehicle chassis, the battery pack can only reduce the loading capacity of the battery cell, so that the endurance capability of the battery pack as a whole is difficult to improve. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application aims to provide a battery pack box and a battery pack to at least partially solve the problem that the endurance capability of the battery pack box with a regular rectangular shape is difficult to improve in order to adapt to the vehicle chassis.

[0005] To achieve the above purpose, the first aspect of the present application provides a battery pack box, comprising: a lower box comprising a first end plate, a second end plate, two side plates and two corner beams, the side plate has a first end and a second end along the extension direction, the first end is connected with the first end plate through the corner beam, and the second end is connected with the second end plate to form a frame structure; the corner beam has a first connecting part, and the first connecting part is located inside the frame structure; wherein the distance between the mutually facing surfaces of the two side plates is different from the distance between the mutually facing exposed surfaces of the two corner beams.

[0006] Optionally, the distance between the mutually facing exposed surfaces of the two corner beams is smaller than the distance between the mutually facing surfaces of the two side plates.

[0007] Optionally, the corner beam comprises a beam main body, the beam main body has an end plate connecting side wall connected with the first end plate, and an exposed side wall adjacent to the end plate connecting side wall, the exposed side wall is formed with a protruding adapter protrusion, and the surface of the adapter protrusion away from the exposed side wall is configured as the side plate connecting side wall connected with the first end.

[0008] Optionally, the side wall of the corner beam close to the inside of the frame structure is formed with a protruding connecting piece, the connecting piece is provided with a connecting structure for mounting a control assembly, so that the connecting piece is configured as the first connecting part.

[0009] Optionally, an inner cavity is arranged in the beam body, and a plurality of first reinforcing ribs are arranged in the inner cavity, at least one of the first reinforcing ribs extends out of the beam body, and the part of the first reinforcing rib located outside the beam body is configured as the connecting plate.

[0010] Optionally, a second reinforcing rib is arranged between at least one side plate surface of the connecting plate and the side wall of the beam body, and / or a second reinforcing rib is arranged between at least one side plate surface of the connecting plate and the side wall of the adapter protrusion.

[0011] Optionally, along the height direction of the lower box body, the corner beam has at least two first connecting portions arranged at intervals, and the at least two first connecting portions are respectively provided with different connecting structures.

[0012] Optionally, the adapter protrusion is close to the end of the connecting body away from the end plate connecting side wall.

[0013] Optionally, the battery pack box further comprises an upper box body matched with the lower box body, and the upper box body is sealingly connected with the top of the corner beam.

[0014] Optionally, a sealing layer is arranged between the upper box body and the top of the corner beam.

[0015] Optionally, the upper box body and the lower box body are connected through a fastener, and the top of the corner beam is provided with an upper box body connecting hole for mounting the fastener.

[0016] Based on the same inventive concept, the second aspect of the present application further provides a battery pack comprising the battery pack box according to the first aspect.

[0017] Optionally, the corner beam has at least two first connecting portions, and the battery pack further comprises different control assemblies respectively connected to the at least two first connecting portions.

[0018] It can be seen from the above that the battery pack box and the battery pack provided by the application have different distances between the mutually facing surfaces of the two side plates and the mutually facing exposed surfaces of the two corner beams, so that the lower box has a part with a larger width and a part with a smaller width. When designing the lower box, the width of each part of the lower box can be designed separately according to the size of the vehicle chassis, that is, the part of the lower box corresponding to the position with a larger width of the vehicle chassis can be designed to have a larger width, so as to increase the internal space of this part of the lower box, which helps to accommodate more battery cells in the battery pack box, thereby improving the endurance of the battery pack; the part of the lower box corresponding to the position with a smaller width of the vehicle chassis can be designed to have a smaller width, so that the battery pack can extend to the position with a smaller width of the vehicle chassis, and the internal space of this part of the lower box can be used to install a single control component with a smaller volume, which can avoid the control component in the battery pack box occupying a larger width, and the corner beam also has the function of connecting and fixing other components in the battery pack, so as to make the structure of the battery pack more compact and help to improve the energy density of the battery pack.

[0019] At the same time, since the battery cells and the control component are both installed in the battery pack box, the battery cells and the control component can be protected by the battery pack box, which helps to improve the service life and power supply reliability of the battery pack using the battery pack box of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the application or related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art description. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A schematic view of the battery pack box of the embodiment of the application;

[0022] Figure 2 A partial schematic view of the lower box of the battery pack box of the embodiment of the application;

[0023] Figure 3 A partial exploded schematic view of the lower box of the battery pack box of the embodiment of the application;

[0024] Figure 4 A partial top view schematic view of the lower box of the battery pack box of the embodiment of the application;

[0025] Figure 5 A partial top view schematic view of the lower box of the battery pack box of the embodiment of the application; Figure 4 An enlarged schematic view of part A in FIG. 8;

[0026] Figure 6 is a schematic view of the outer side of the corner beam of the battery pack box body of the embodiment of the present application;

[0027] Figure 7 is a partial schematic view of the inside of the battery pack box body of the embodiment of the present application;

[0028] Figure 8 is a partial schematic view of the inside of the battery pack box body of the embodiment of the present application; Figure 7 is an enlarged schematic view of the middle B part;

[0029] Figure 9 is an enlarged schematic view of the middle C part. Figure 1

[0030] Legend of reference signs:

[0031] 100, lower box body; 110, side plate; 111, first end; 112, second end; 113, side plate bottom beam; 120, first end plate; 130, second end plate; 140, corner beam; 141, first connecting part; 1411, connecting sheet; 1412, connecting structure; 142, beam main body; 1421, end plate connecting side wall; 1422, exposed side wall; 1423, inner cavity; 143, adapter protrusion; 1431, side plate connecting side wall; 144, first reinforcing rib; 145, second reinforcing rib; 146, upper box body connecting hole; 150, bottom plate; 160, first accommodating sub-cavity; 170, second accommodating sub-cavity;

[0032] 200, upper box body; 210, upper flange. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments and the accompanying drawings.

[0034] It should be noted that: unless otherwise specified, the relative arrangement, numerical expression and numerical value of the components set forth in these embodiments do not limit the scope of the present application.

[0035] At the same time, it should be understood that, in order to facilitate the description, the size of each part shown in the drawings is not drawn in accordance with the actual proportional relationship.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0037] ​It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application shall have the common meaning understood by one of ordinary skill in the art to which the embodiments of the present application belong. The terms "first", "second", and similar terms used in the embodiments of the present application do not denote any order, quantity, or importance, but are merely used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are merely used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0038] In some embodiments, in order to increase the number of battery cells arranged in the rectangular battery pack box, part of the control components (for example, the battery management system BMS) are installed outside the battery pack box to save the internal space of the battery pack box for adding battery cells to realize the endurance capability of the battery pack.

[0039] However, the applicant found that, by externally arranging the control components, on the one hand, the control components cannot be protected by the battery pack box, and when the vehicle is running or the vehicle chassis is impacted, the control components are likely to be damaged, thereby causing a safety hazard of the battery pack. On the other hand, since the control components arranged outside the battery pack box still need to be physically and electrically connected with the battery cells or the busbar components inside the battery pack box (i.e., electrically connected through connecting wires or connecting tabs), the electrical connecting members (i.e., connecting wires or connecting tabs) passing through the battery pack box will affect the sealing performance of the battery pack box to some extent, and will also make the structure of the battery pack box more complex.

[0040] To solve the above problems, the embodiments of the present application provide a battery pack box, as shown in Figure 1 , Figure 1 A schematic diagram of the battery pack box is shown, which includes a lower box 100 and an upper box 200 covering the lower box 100. As shown in Figure 2 , Figure 2 A partial schematic diagram of the lower box 100 is shown, which includes a first end plate 120, a second end plate 130, two side plates 110, and two corner beams 140. As shown in Figure 3 , Figure 3 A partial exploded schematic diagram of the lower box 100 is shown, the side plates 110 extend along the direction of the arrow A, and the corner beams 140 extend along the direction of the arrow B. As shown in Figure 3The structure (in the X direction) has a first end 111 and a second end 112. The first end 111 is connected to the first end plate 120 via a corner beam 140, and the second end 112 is connected to the second end plate 130 to form a frame structure. The corner beam 140 has a first connecting part 141, which is located inside the frame structure. Figure 4 , Figure 4 A partial top view of the lower housing 100 is shown, showing that the distance b between the opposing surfaces of the two side panels 110 is different from the distance a between the opposing exposed surfaces of the two corner beams 140.

[0041] For example, the lower housing 100 also includes a bottom plate 150, which blocks the bottom opening of the frame structure.

[0042] For example, such as Figure 3 The bottom of the side plate 110 is provided with a side plate bottom beam 113, which can be inserted and matched with the bottom plate 150. The first end plate 120, the second end plate 130 and the corner beam 140 are all provided on the upper surface of the bottom plate 150 or the side plate bottom beam 113.

[0043] For example, the first end plate 120 along the width direction of the frame structure (e.g. Figure 4 The dimension of the second end plate 130 in the Y direction matches the spacing between the two side plates 110; the dimension of the second end plate 130 in the width direction of the frame structure matches the spacing between the two corner beams 140.

[0044] For example, the first connection portion 141 is used to install control components or to position battery cells.

[0045] by Figure 4 Taking the structure shown as an example for further explanation, for ease of explanation, the internal space of the lower housing 100 is divided into a first receiving sub-cavity 160 and a second receiving sub-cavity 170. The first receiving sub-cavity 160 is located between the two corner beams 140, and the second receiving sub-cavity 170 is located between the two side plates 110. The size relationship between the width a' of the first receiving sub-cavity 160 and the width b' of the second receiving sub-cavity 170 is the same as the size relationship between a and b mentioned above, that is, when a is greater than b, then a' is greater than b'; when a is less than b, then a' is less than b'.

[0046] For the battery pack housing of this embodiment, one of the first receiving sub-cavity 160 and the second receiving sub-cavity 170 can be used to house the battery cells, and the other can be used to house at least part of the control components. Typically, the individual dimensions of the battery cell stack are relatively large, therefore the battery cells can be placed in a space with a larger width (e.g., ...). Figure 4 The second receiving cavity 170 in the middle); while the control component is small in size, so the control component can be placed in a space with a small width (e.g., Figure 4The first accommodating sub-cavity 160 corresponding to the corner beam 140 is smaller in width, and can be used to install the control components.

[0047] For the battery pack box body provided in the embodiment, the distance b between the mutually facing surfaces of the two side plates 110 is different from the distance a between the mutually facing exposed surfaces of the two corner beams 140, so that the lower box body 100 has a part with a larger width and a part with a smaller width. When designing the lower box body 100, the width of each part of the lower box body 100 can be designed respectively according to the size of the vehicle chassis, that is, the part of the lower box body 100 corresponding to the position with a larger width of the vehicle chassis can be designed to have a larger width, so as to increase the internal space of the part of the lower box body 100, which helps to accommodate more battery cells in the battery pack box body, so as to improve the endurance of the battery pack; the part of the lower box body 100 corresponding to the position with a smaller width of the vehicle chassis can be designed to have a smaller width, so that the battery pack can extend to the position with a smaller width of the vehicle chassis, and the internal space of the part of the lower box body 100 can be used to install a single control component with a smaller volume, which can avoid that the control components in the battery pack box body occupy a larger width, and helps to improve the energy density of the battery pack using the battery pack box body of the embodiment.

[0048] At the same time, since the battery cells and the control components are both installed in the battery pack box body, the battery cells and the control components can be protected by the battery pack box body, which helps to improve the service life and power supply reliability of the battery pack using the battery pack box body of the embodiment.

[0049] For example, Figure 4 In some embodiments, the distance a between the mutually facing exposed surfaces of the two corner beams 140 is smaller than the distance b between the mutually facing surfaces of the two side plates 110, that is, a < b.

[0050] For example, the first accommodating sub-cavity 160 corresponding to the corner beam 140 is smaller in width, and the control components can be installed in the first accommodating sub-cavity 160.

[0051] For example, the first connecting part 141 is used to install a controller, a mounting bracket, or a cable tie for binding the connecting wire, so that the corner beam has the function of connecting and fixing other components in the battery pack, so as to make the structure of the battery pack more compact.

[0052] In the embodiment, the first accommodating sub-cavity 160 corresponding to the corner beam 140 is smaller in width, and can be used to install the control components. Since the control components are small in size, the length (the size in the X direction of the Figure 4 In the embodiment, the first accommodating sub-cavity 160 corresponding to the corner beam 140 is smaller in width, and can be used to install the control components. Since the control components are small in size, the length (the size in the X direction of the

[0053] The second accommodating sub-cavity 170 corresponding to the side plate 110 has a larger width, which can be used to install the battery cell. Since the battery cell is configured to form a battery cell stack with a larger size, the length of the second accommodating sub-cavity 170 is also designed to be larger, and accordingly, the length of the side plate 110 is also larger.

[0054] Compared with the corner beam 140, the structure of the side plate 110 is relatively simple, and the preparation cost is relatively low. By surrounding the second accommodating sub-cavity 170 with a larger space through the side plate 110, the preparation cost of the battery pack box body as a whole can be reduced, which is helpful for mass production.

[0055] As shown in Figure 5 , Figure 5 As shown in Figure 4 , the enlarged schematic view of part A in FIG. 1, in some embodiments, the corner beam 140 includes a beam body 142, the beam body 142 has an end plate connecting side wall 1421 connected with the first end plate 120, and an exposed side wall 1422 adjacent to the end plate connecting side wall 1421, the exposed side wall 1422 is formed with a protruding adapter protrusion 143, the adapter protrusion 143 is configured to be connected with the side plate connecting side wall 1431 of the first end 111 away from the surface of the exposed side wall 1422.

[0056] For example, the side plate connecting side wall 1431 is covered by the first end 111, the end plate connecting side wall 1421 is covered by the first end plate 120, and the exposed side wall 1422 is exposed between the side plate 110 and the first end plate 120.

[0057] For example, the side plate connecting side wall 1431 is parallel to the exposed side wall 1422, and the exposed side wall 1422 is perpendicular to the end plate connecting side wall 1421.

[0058] For example, as shown in Figure 6 , Figure 6 As shown in the outer side view of the corner beam 140, along the height direction (such as Figure 6 Z direction in FIG. 1) of the lower box body 100, the edges of the end plate connecting side wall 1421, the exposed side wall 1422 and the side plate connecting side wall 1431 are flush.

[0059] The two side plates 110 are connected to the side plate connecting side wall 1431 of the two corner beams 140 respectively. Correspondingly, the difference between a and b is related to the protruding height of the adapter protrusion 143 protruding from the exposed side wall 1422.

[0060] In this embodiment, the same corner beam 140 is configured by the beam body 142 and the adapter protrusion 143 arranged on the beam body 142 to form two parts with different widths of the lower box body 100. On the basis of realizing the irregular shape design of the lower box body 100 through the corner beam 140, the structure of the corner beam 140 is simplified, which is helpful to reduce the preparation cost of the corner beam 140.

[0061] like Figure 6 In some embodiments, the transition protrusion 143 is located near the end of the beam body 142 away from the end plate connecting sidewall 1421.

[0062] In this embodiment, the beam body 142 and the transition protrusion 143 constitute an L-shaped structure with a horizontal cross-section. The side plate connecting sidewall 1431 and the end plate connecting sidewall 1421 are located at both ends of the beam body 142, which helps to shorten the length of the beam body 142 (e.g., Figure 6 (Dimensions in the X direction), thereby further reducing the manufacturing cost of the corner beam 140.

[0063] Figure 7 A partial schematic diagram of the interior of the lower housing 100 is shown. Figure 8 Showing Figure 7 Enlarged diagram of part B.

[0064] like Figure 7 and Figure 8 In some embodiments, the sidewall of the corner beam 140 near the interior of the frame structure is formed with a protruding connecting piece 1411, the connecting piece 1411 being provided with a connecting structure 1412 for mounting control components, so that the connecting piece 1411 is configured as a first connecting portion 141.

[0065] For example, the connecting piece 1411 is a horizontally arranged plate-like structure, which can stably support the structural components connected above it, and facilitate the installation of control components into the connecting structure 1412.

[0066] For example, the connecting piece 1411 can be along the length direction of the lower housing 100 (e.g., Figure 8 The beam body 142 protrudes in the X direction; or, the beam body 142 protrudes along the width direction of the lower box 100.

[0067] For example, the connecting piece 1411 and the beam body 142 can be connected to each other by welding, plugging, snapping, integral molding, adhesive bonding or fastener connection.

[0068] As described above, the first connecting part 141 can be used to connect control components. Therefore, the height of the connecting piece 1411 from the base plate 150 can be determined based on the preset installation height of the control components, and the number of connecting pieces 1411 is also determined based on the number of control components. Designing the first connecting part 141 as a thin connecting piece 1411 reduces the manufacturing cost of the corner beam 140. Furthermore, since a single connecting piece 1411 occupies less space in the height direction of the lower housing 100, the height and number of connecting pieces 1411 can be flexibly set, making it easier for the first connecting part 141 of the corner beam 140 to meet the device installation requirements inside the battery pack housing.

[0069] As Figure 8 In some embodiments, the inner part of the beam body 142 is provided with an inner cavity 1423, a plurality of first reinforcing ribs 144 are arranged in the inner cavity 1423, at least one of the first reinforcing ribs 144 extends out of the beam body 142, and the part of the first reinforcing rib 144 outside the beam body 142 is configured as a connecting piece 1411.

[0070] For example, the first reinforcing rib 144 is a horizontally arranged plate-shaped reinforcing rib.

[0071] For example, the inner cavity 1423 is also provided with a longitudinal plate-shaped reinforcing rib intersecting with the first reinforcing rib 144, so as to further improve the strength of the beam body 142.

[0072] For example, the inner cavity 1423 is in communication with the internal space of the battery pack at least on the side of the beam body 142 close to the inner part of the lower box body 100, so as to simplify the structure of the beam body 142.

[0073] In the present embodiment, the first reinforcing rib 144 in the inner cavity 1423 of the beam body 142 is extended, so that the part of the first reinforcing rib 144 extending out of the beam body 142 forms the connecting piece 1411, and further forms the first connecting part 141, that is, the same structure (horizontally arranged plate-shaped reinforcing rib) realizes two different functions, which improves the structural strength of the hollow beam body 142, and provides a structural basis for the formation of the first connecting part 141, which helps to simplify the structure of the corner beam 140 and reduce the manufacturing cost of the corner beam 140.

[0074] As Figure 8 In some embodiments, a second reinforcing rib 145 is arranged between at least one side surface of the connecting piece 1411 and the side wall of the beam body 142; and / or, a second reinforcing rib 145 is arranged between at least one side surface of the connecting piece 1411 and the side wall of the adapter protrusion 143.

[0075] For example, the second reinforcing rib 145 is a vertically arranged plate-shaped reinforcing rib.

[0076] For example, the second reinforcing rib 145 can be a triangular plate-shaped reinforcing rib.

[0077] Since the connecting piece 1411 is used to form the first connecting part 141 of the supporting or positioning control assembly, it is necessary to ensure that the connecting piece 1411 does not deform by bending, so as to ensure that the control assembly remains in the preset position. The present example is configured by arranging the second reinforcing rib 145 between the connecting piece 1411 and the beam body 142, or between the connecting piece 1411 and the adapter protrusion 143, which helps to improve the strength of the connecting piece 1411 and avoid the bending deformation of the connecting piece 1411 with relatively thin thickness.

[0078] like Figure 7 and Figure 8 In some embodiments, along the height direction of the lower housing 100, the corner beam 140 has at least two spaced first connecting portions 141, and the at least two first connecting portions 141 are respectively provided with different connecting structures 1412, for example, different shapes or different structures.

[0079] For example, the connection structure 1412 can be a through hole, a blind hole, or a countersunk hole, and the control component can be installed on the connection structure 1412 by cable ties.

[0080] For example, the hole wall of the connection structure 1412 is smooth or threaded, and the control component can be installed on the connection structure 1412 by bolts.

[0081] On the same corner beam 140, different first connecting parts 141 can be provided with connecting structures 1412 of different shapes. Thus, the same corner beam 140 can be equipped with various control components of different structures or different installation methods through different first connecting parts 141, which can make the corner beam 140 of this embodiment more versatile.

[0082] like Figure 9 , Figure 9 Showing Figure 1 The enlarged schematic diagram of part C shows that in some embodiments, the battery pack housing also includes an upper housing 200 that cooperates with the lower housing 100, and the upper housing 200 is sealed to the top of the corner beam 140.

[0083] For example, an upper flange 210 is provided around the bottom of the upper housing 200. The upper flange 210 can be connected to the top of the first end plate 120, the top of the second end plate 130, the top of the corner beam 140 (including the beam body 142 and the transition protrusion 143), and the top surface of the side plate 110 respectively to achieve a sealed connection.

[0084] For example, the upper housing 200 can also be sealed to the top of the corner beam 140 by adhesive bonding.

[0085] For example, the horizontal cross-sectional shape of the upper box 200 is the same as that of the lower box 100, so as to achieve mutual cooperation between the upper box 200 and the lower box 100.

[0086] To ensure the sealing performance of the battery pack housing, the upper housing 200 and the lower housing 100 need to be sealed together to better isolate the internal space of the battery pack housing from the outside world, thereby better protecting the battery cells and control components located inside the battery pack housing.

[0087] Since the corner beam 140 itself is also part of the frame structure constituting the lower box body 100, when the corner beam 140 and the upper box body 200 are also in sealing connection, it can be ensured that a continuous annular sealing surface can be formed between the upper box body 200 and the lower box body 100, thereby better meeting the sealing requirements of the battery pack box body.

[0088] In some embodiments, a sealing layer is arranged between the top of the corner beam 140 and the upper box body 200.

[0089] Illustratively, the sealing layer can be a rubber sealing gasket or a structural layer formed after the curing of a sealant.

[0090] Illustratively, the sealing layer is arranged between the top of the beam body 142 and the upper flange 210, and between the top of the adapter protrusion 143 and the upper flange 210, respectively.

[0091] By arranging the sealing layer between the top of the corner beam 140 and the upper box body 200, the sealing performance between the corner beam 140 and the upper box body 200 can be improved, thereby further improving the overall sealing performance of the battery pack box body.

[0092] As Figure 1 In some embodiments, the upper box body 200 and the lower box body 100 are connected by fasteners. As Figure 8 The top of the corner beam 140 is provided with an upper box body connecting hole 146 for mounting the fastener.

[0093] Illustratively, the fastener can be a screw, or a bolt with a nut.

[0094] Illustratively, the upper flange 210 is provided with a through hole for the fastener to pass through.

[0095] Illustratively, the hole wall of the upper box body connecting hole 146 is smooth or provided with threads.

[0096] Illustratively, the top of the first end plate 120, the top of the second end plate 130, and the top of the side plate 110 can all be provided with the upper box body connecting hole 146.

[0097] The fastener can apply a force to the upper box body 200 and the corner beam 140 to keep the top of the upper box body 200 and the corner beam 140 abutting, thereby ensuring that the upper box body 200 and the corner beam 140 can maintain good sealing performance, thereby further improving the overall sealing reliability of the battery pack box body.

[0098] Based on the same inventive concept, in combination with the description of the battery pack box body of each of the above embodiments, the present embodiment provides a battery pack having the corresponding technical effects of the battery pack box body of each of the above embodiments, which will not be described here.

[0099] A battery pack comprising the battery pack case as described in the above embodiments.

[0100] In some embodiments, the corner beam 140 has at least two first connecting portions 141, and the battery pack further comprises different control assemblies respectively connected to the at least two first connecting portions 141.

[0101] In combination with the foregoing, since the different first connecting portions 141 can be respectively provided with different connecting structures 1412, the control assemblies with different structures or different connection modes in the battery pack can be mounted on the different first connecting portions 141 of the same corner beam 140, which helps to reduce the assembly difficulty of the battery pack and reduce the assembly cost.

[0102] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in a different order than those described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0103] Each embodiment in the present application is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0104] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the present application and its practical application, and to enable others skilled in the art to understand the present application in order to design various embodiments with various modifications for specific use cases.

[0105] Those of ordinary skill in the art will understand that the discussion of any embodiment is merely exemplary and is not intended to suggest that the scope of the present application is limited to these examples; the embodiments or technical features among different embodiments can also be combined, steps can be implemented in any order, and there are many other variations of the aspects of the embodiments of the present application as described above, which are not provided in detail.

[0106] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art from the foregoing description.

[0107] Embodiments of the present application are intended to embrace all such alterations, modifications, and variations that fall within the scope of the present application. Accordingly, although the present application has been described with respect to example embodiments, it will be apparent that the scope of the application is not limited to these described embodiments, but instead encompasses any and all alterations, modifications and variations that can fall within the scope of the present application.

Claims

1. A battery pack case characterized by, Comprise: The lower box body comprises a first end plate, a second end plate, two side plates and two corner beams, the side plates have a first end and a second end along the extension direction, the first end is connected with the first end plate through the corner beam, and the second end is connected with the second end plate to form a frame structure; the corner beam has a first connecting part inside the frame structure; Wherein, the distance between the mutually facing surfaces of the two side plates is different from the distance between the mutually facing exposed surfaces of the two corner beams.

2. The battery pack enclosure of claim 1, wherein, The distance between the mutually facing exposed surfaces of the two corner beams is less than the distance between the mutually facing surfaces of the two side plates.

3. The battery pack enclosure of claim 1, wherein, The corner beam comprises a beam body, the beam body has an end plate connecting side wall connected with the first end plate, and an exposed side wall adjacent to the end plate connecting side wall, the exposed side wall is formed with a protruding adapter protrusion, and the adapter protrusion is away from the surface structure of the exposed side wall and connected with the side plate connecting side wall of the first end.

4. The battery pack enclosure of claim 3, wherein, The side wall of the corner beam close to the inside of the frame structure is formed with a protruding connecting piece, the connecting piece is provided with a connecting structure for mounting a control assembly, so that the connecting piece is configured as the first connecting part.

5. The battery pack enclosure of claim 4, wherein, The inside of the beam body is provided with an inner cavity, a plurality of first reinforcing ribs are arranged in the inner cavity, at least one of the first reinforcing ribs extends out of the beam body, and the part of the first reinforcing rib located outside the beam body is configured as the connecting piece.

6. The battery pack enclosure of claim 4, wherein, At least one side plate surface of the connecting piece and the side wall of the beam body are provided with a second reinforcing rib; and / or, At least one side plate surface of the connecting piece and the side wall of the adapter protrusion are provided with a second reinforcing rib.

7. The battery pack enclosure of claim 4, wherein, Along the height direction of the lower box body, the corner beam has at least two first connecting parts arranged at intervals, and at least two first connecting parts are respectively provided with different connecting structures.

8. The battery pack enclosure of claim 3, wherein, The adapter protrusion is close to the end of the beam body away from the end plate connecting side wall.

9. The battery pack enclosure of claim 1, wherein, The battery pack box body further comprises an upper box body matched with the lower box body, and the upper box body is sealingly connected with the top of the corner beam.

10. The battery pack enclosure of claim 9, wherein, A sealing layer is arranged between the upper box body and the top of the corner beam.

11. The battery pack enclosure of claim 9, wherein, The upper box body and the lower box body are connected through fasteners, and the top of the corner beam is provided with an upper box body connecting hole for mounting the fastener.

12. A battery pack, characterized by Comprise the battery pack box body as claimed in any one of claims 1 to 11.

13. The battery pack of claim 12, wherein, The corner beam has at least two first connecting parts, and the battery pack further comprises different control assemblies respectively connected to the at least two first connecting parts.

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