Battery box body and battery pack

Abstract

The utility model discloses a battery box body and a battery pack, and relates to the technical field of batteries. The battery box body comprises a connecting bracket, a first expansion beam and a second expansion beam, wherein the second expansion beam is provided with an end opening and an inner cavity; the connecting bracket comprises a first part and a second part which are integrally formed, and the first part is fixedly connected with the first expansion beam; and the second part extends into the inner cavity of the second expansion beam through the end opening and is fixedly connected with the second expansion beam. According to the battery box body and the battery pack disclosed by the invention, the box body is higher in structural strength, firmer and more durable.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and a battery pack. Background Art

[0002] A battery pack typically consists of a battery case and cells, with the cells mounted inside the case. During the charge and discharge process, the cells expand due to internal gassing and electrode expansion, and the case is designed to withstand this expansion.

[0003] In related art, the battery case consists of multiple expansion beams (including horizontal and longitudinal beams), which are spliced ​​and then welded using argon arc welding to form the battery case's skeleton. However, in practice, it has been found that the battery case structure formed by welding is insufficiently strong, and the welds may crack and fail after repeated impacts. Utility Model Content

[0004] In view of this, the present application provides a battery box and a battery pack, the box structure of which has higher strength and is more solid and durable.

[0005] This application specifically adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery box, the battery box comprising a connecting bracket, a first expansion beam and a second expansion beam, the second expansion beam having an end opening and an inner cavity;

[0007] The connecting bracket includes an integrally formed first part and a second part, the first part is firmly connected to the first expansion beam; the second part extends into the inner cavity of the second expansion beam through the end opening and is firmly connected to the second expansion beam.

[0008] Optionally, the first part of the connecting bracket is a connecting plate, the second part of the connecting bracket is a hollow tube, and one end of the hollow tube is connected to the plate surface of the connecting plate.

[0009] Optionally, the plate surface of the connecting plate facing away from the hollow tube contacts and cooperates with the side wall surface of the first expansion beam, and a plurality of first connection positions are provided on the connecting plate, and the plurality of first connection positions are distributed on opposite sides of the hollow tube and are respectively connected to the side walls of the first expansion beam.

[0010] Optionally, the plurality of first connection locations located on the same side of the hollow tube are distributed in multiple rows and columns;

[0011] Each of the first connection positions includes a first mounting hole and a first fastener. A second mounting hole is provided on the side wall of the first expansion beam at a position corresponding to the first mounting hole. The first fastener is used to pass through the first mounting hole and the second mounting hole and fasten the connecting plate and the first expansion beam.

[0012] Optionally, the hollow tube is located in the middle of the connecting plate in a first direction, and the first direction is parallel to the length direction of the first expansion beam; and / or,

[0013] The plurality of first connection positions are symmetrically distributed on two opposite sides of the hollow tube in the first direction.

[0014] Optionally, the second expansion beam has a first beam wall and a second beam wall that are opposite to each other in a second direction, and the second direction is parallel to a height direction of the second expansion beam;

[0015] The hollow tube has a first tube wall and a second tube wall opposite to each other in the second direction, the first tube wall and the second tube wall are respectively in contact with the first beam wall and the second beam wall, and the first tube wall and the second tube wall are each provided with a plurality of second connection positions, which are respectively connected to the corresponding beam walls on the second expansion beam.

[0016] Optionally, each of the second connection positions includes a third mounting hole and a second fastener, and a fourth mounting hole is provided on the beam wall of the second expansion beam at a position corresponding to the third mounting hole. The second fastener passes through the third mounting hole and the fourth mounting hole and fastens the hollow tube and the second expansion beam.

[0017] Optionally, the centers of the plurality of second connection positions on the first tube wall are not on the same straight line; and / or the centers of the plurality of second connection positions on the second tube wall are not on the same straight line.

[0018] Optionally, the battery box includes a bottom plate; a third connection position is further provided on the second tube wall, and the third connection position is used to connect with the second expansion beam and the bottom plate.

[0019] Optionally, the connecting bracket further includes a reinforcement portion, which is located inside the hollow tube and is integrally formed with the hollow tube.

[0020] A second aspect of an embodiment of the present application provides a battery pack, which includes the battery case described in the first aspect, and battery cells installed in the battery case.

[0021] In the battery case provided in the embodiment of the present application, the first expansion beam and the second expansion beam are connected by means of an integrally formed connecting bracket, wherein the first expansion beam is fastened to the first part of the connecting bracket, and the second expansion beam is plugged into and fastened to the second part of the connecting bracket. Therefore, compared with the welding connection method in the related art, the solution of the embodiment of the present application can make the first expansion beam and the second expansion beam have a higher connection strength, thereby improving the structural strength of the case and making the battery case more stable and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a schematic structural diagram of a battery box provided in an embodiment of the present application;

[0024] Figure 2 This is an exploded view of the first connection position of the upper portion of the connecting bracket provided in an embodiment of the present application;

[0025] Figure 3 This is a structural diagram of a second expansion beam provided in an embodiment of the present application;

[0026] Figure 4 This is a schematic diagram of the assembly of the connecting bracket, the first expansion beam, and the second expansion beam provided in an embodiment of the present application;

[0027] Figure 5 is an exploded view of the third connection position on the connection bracket provided in an embodiment of the present application;

[0028] Figure 6 It is along Figure 1 Schematic diagram of the cross section along line AA;

[0029] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0030] Reference numerals:

[0031] 1. Connecting bracket; 11. First portion; 111. Connecting plate; 112. First connecting position; 1121. First mounting hole; 1122. First fastener; 12. Second portion; 121. Hollow tube; 1211. First tube wall; 1212. Second tube wall; 122. Second connecting position; 1221. Third mounting hole; 1222. Second fastener; 123. Third connecting position; 1231. Fifth mounting hole; 1232. Third fastener; 13. Reinforcement portion;

[0032] 2. First expansion beam; 21. Side wall; 22. Second mounting hole;

[0033] 3. Second expansion beam; 31. End opening; 32. First beam wall; 33. Second beam wall; 34. Fourth mounting hole; 35. Inner cavity;

[0034] 4. Base plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0037] The embodiment of the present application provides a battery box, such as Figure 1 As shown, the battery box includes a connecting bracket 1, a first expansion beam 2 and a second expansion beam 3, the second expansion beam 3 has an end opening 31 and an inner cavity 35; the connecting bracket 1 includes an integrally formed first part 11 and a second part 12, the first part 11 is fastened to the first expansion beam 2, and the second part 12 extends into the inner cavity 35 of the second expansion beam 3 through the end opening 31 and is fastened to the second expansion beam 3.

[0038] It should be noted that, in the embodiments of the present application, a fastened connection refers to a method of connecting two parts using fasteners such as bolts, screws, and rivets.

[0039] Therefore, in the battery case provided in the embodiment of the present application, the first expansion beam 2 is firmly connected to the first part 11 of the connecting bracket 1, and the second expansion beam 3 is plugged into and firmly connected to the second part 12 of the connecting bracket 1. The first part 11 and the second part 12 of the connecting bracket 1 are integrally formed. Therefore, compared with the welding connection method in the related art, the solution of the embodiment of the present application can make the first expansion beam 2 and the second expansion beam 3 have a higher connection strength, thereby improving the structural strength of the case and making the battery case more stable and durable.

[0040] In order to make the technical solutions and advantages of this application clearer, Figure 1-7 , further introduces and illustrates the structure of a battery box provided in an embodiment of the present application.

[0041] See also Figure 1 The battery case provided by an embodiment of the present application has at least one first expansion beam 2 extending along a first direction and at least one second expansion beam 3 extending along a second direction, wherein the first direction is perpendicular to the second direction. In some examples, the first expansion beam 2 can also be referred to as a transverse beam, and the second expansion beam 3 can also be referred to as a longitudinal beam; alternatively, the first expansion beam 2 can also be referred to as a longitudinal beam, and the second expansion beam 3 can also be referred to as a transverse beam. The first expansion beam 2 and the second expansion beam 3 are connected to each other, thereby defining a mounting space for at least one battery cell within the battery case.

[0042] In the box provided in the embodiment of the present application, at least one first expansion beam 2 and at least one second expansion beam 3 are connected by a connecting bracket 1. Optionally, since the middle area of ​​the battery box is the weakest area when the box is vibrated and impacted, the first expansion beam 2 and the second expansion beam 3 located in the middle area can be connected by the connecting bracket 1.

[0043] Figure 2 This is a schematic diagram of the structure of a connecting bracket 1 provided in an embodiment of the present application. Figure 2 As shown, the connecting bracket 1 includes an integrally formed first part 11 and a second part 12, which are adapted to the arrangement of the first expansion beam 2 and the second expansion beam 3. The first part 11 of the connecting bracket 1 extends along the first direction, and the second part 12 extends along the second direction.

[0044] In some embodiments of the present application, the first part 11 of the connecting bracket 1 can be a connecting plate 111, the plate surface of which is parallel to the first direction and perpendicular to the second direction; the second part 12 of the connecting bracket 1 can be a hollow tube 121, the axis of which is parallel to the second direction and perpendicular to the first direction, and one end of the hollow tube 121 is connected to the plate surface of the connecting plate 111.

[0045] When the connecting bracket 1 is used to connect the second expansion beam 3 to the first expansion beam 2, the side plate surface of the connecting plate 111 facing away from the hollow tube 121 is in contact with the side wall 21 of the first expansion beam 2, and is connected to the first expansion beam 2 through fasteners; the hollow tube 121 extends into the interior of the second expansion beam 3 from the end opening 31, and the tube wall of the hollow tube 121 is firmly connected to the beam wall of the second expansion beam 3.

[0046] like Figure 2 As shown, the connecting plate 111 is provided with a plurality of first connection points 112, which are distributed on opposite sides of the hollow tube 121. The connecting plate 111 is fastened to the sidewall 21 of the first expansion beam 2 via the first connection points 112. In this way, the connecting plate 111 has stress points on both sides of the hollow tube 121. When the battery case vibrates or is impacted, the stress can be balanced to avoid stress concentration. Furthermore, the surface contact fit also helps to disperse the local stress between the connecting plate 111 and the first expansion beam 2, improving the structural stability of the connection.

[0047] Optionally, the plurality of first connection positions 112 on the same side of the hollow tube 121 are distributed in multiple rows and columns. In this way, the impact force or vibration force can be effectively dispersed and transmitted while ensuring sufficient connection strength, thereby avoiding connection failure caused by stress concentration. For example, Figure 2 As shown, the plurality of first connection positions 112 located on the same side of the hollow tube 121 are distributed in four rows and two columns.

[0048] Optionally, continue with Figure 2 The hollow tube 121 is located in the exact middle of the connecting plate 111 in a first direction, where the first direction is parallel to the length of the first expansion beam 2. By locating the hollow tube 121 in the exact middle of the connecting plate 111, it is possible to ensure that the forces on both sides of the hollow tube 121 and the connecting plate 111 are evenly distributed, thereby improving the impact resistance of the connecting bracket 1 and the impact resistance of the connection between the connecting plate 111 and the first expansion beam 2, thereby improving the structural strength and impact resistance of the battery box.

[0049] Optionally, the plurality of first connection points 112 on the connecting plate 111 are symmetrically distributed on both sides of the hollow tube 121 in the first direction. In other words, all first connection points 112 on the connecting plate 111 are symmetrically distributed about the midline of the orthographic projection of the hollow tube 121 onto the surface of the connecting plate 111. This ensures uniform force on both sides of the connecting plate 111, improves the impact resistance of the connection between the connecting plate 111 and the first expansion beam 2, and thereby enhances the structural strength and impact resistance of the battery case.

[0050] In some embodiments of the present application, each first connection position 112 includes a first mounting hole 1121 and a first fastener 1122. A second mounting hole 22 is provided on the side wall 21 of the first expansion beam 2 at a position corresponding to the first mounting hole 1121. The first fastener 1122 is used to pass through the first mounting hole 1121 and the second mounting hole 22, and fasten the connecting plate 111 and the first expansion beam 2 together.

[0051] Optionally, first fastener 1122 may include a rivet. Using rivets can achieve a high-strength and high-rigidity connection, and the connection point can withstand large loads, with good impact and vibration resistance. Furthermore, the riveting process is simple, easy to operate, and highly efficient. Exemplarily, first fastener 1122 is a blind rivet.

[0052] Alternatively, the first fastener 1122 may include a bolt and a nut. The bolt passes through the first mounting hole 1121 and the second mounting hole 22 and is fastened by the nut. This connection method can cope with various load conditions, especially exhibiting good toughness and plasticity under dynamic loads.

[0053] Moreover, compared to the welding connection method in the related art, the embodiment of the present application uses fasteners such as rivets or bolts to fasten the connection between the connecting plate 111 and the first expansion beam 2. This can reduce the impact of welding on the size of the first expansion beam 2, improve dimensional accuracy, further improve performance, and reduce production costs. Moreover, the thermal effects of the welding connection method can also cause damage to the parent material structure of the first expansion beam 2, such as brittleness of the material near the weld, welding residual stress and deformation, etc. The embodiment of the present application eliminates the welding connection method and adopts a mechanical connection method. This can also reduce the heat-affected zone, avoid failure caused by the reduced impact resistance of the parent material itself, and make the battery box more stable and durable.

[0054] Figure 3 The structure of the second expansion beam 3 is shown. Figure 3 The second expansion beam 3 is a hollow beam body having a first beam wall 32 and a second beam wall 33 that are opposite to each other in a second direction, where the second direction is parallel to the height direction of the second expansion beam 3. At least one end of the second expansion beam 3 has an end opening 31, which is used to connect the inner cavity 35 of the second expansion beam 3 with the outside.

[0055] Optionally, at least one connecting rib extending along the first direction may be further provided in the inner cavity 35 of the second expansion beam 3 to serve as a structural reinforcement to improve the impact resistance of the second expansion beam 3. When there are multiple connecting ribs, the multiple connecting ribs are spaced apart along the second direction.

[0056] Optionally, the structure of the first expansion beam 2 is similar to that of the second expansion beam 3 , that is, the first expansion beam 2 also has a hollow beam body and has at least one connecting rib extending along the second direction.

[0057] It should be noted that if Figure 3 As shown, since the second expansion beam 3 needs to accommodate the hollow tube 121, there is a certain distance between the connecting ribs inside the second expansion beam 3 and the end opening 31 of the second expansion beam 3. The distance is related to the length of the hollow tube 121. As long as it can be ensured that it does not affect the insertion of the hollow tube 121 into the interior of the second expansion beam 3, it is sufficient.

[0058] Figure 4 The figure shows the assembly method of the second expansion beam 3 and the hollow tube 121 of the connecting bracket 1. Figure 4 As shown, the hollow tube 121 has a first tube wall 1211 and a second tube wall 1212 opposite to each other in the second direction. After the hollow tube 121 extends into the second expansion beam 3, the first tube wall 1211 and the second tube wall 1212 are in surface contact with the first beam wall 32 and the second beam wall 33 of the second expansion beam 3 respectively, and the first tube wall 1211 is connected to the first beam wall 32, and the second tube wall 1212 is connected to the second beam wall 33.

[0059] The wall of the hollow tube 121 and the wall of the second expansion beam 3 are in surface contact, which helps to disperse the local stress between the hollow tube 121 and the second expansion beam 3 and improve the structural stability of the connection. The shape of the hollow tube 121 is adapted to the shape of the second expansion beam 3 to ensure good surface contact. In one example, Figure 4 As shown, the second expansion beam 3 is a square beam. Accordingly, the hollow tube 121 is a square tube. The square tube is located inside the square beam, and the four circumferential walls of the square tube are in contact with the four circumferential walls of the square beam. Therefore, the hollow tube 121 can support the square beam and improve its impact resistance and deformation resistance.

[0060] In some embodiments of the present application, Figure 5 As shown, the connecting bracket 1 further includes a reinforcing portion 13 , which is located inside the hollow tube 121 and is integrally formed with the hollow tube 121 . The reinforcing portion 13 is used to improve the structural strength of the hollow tube 121 .

[0061] As mentioned above, see Figure 3 and Figure 7 The portion of the inner cavity 35 of the second expansion beam 3 near the end opening 31 is not provided with reinforcing ribs because it is needed to accommodate the hollow tube 121. The reinforcing portion 13 of the connecting bracket 1 is used to compensate for the structural strength of this portion of the second expansion beam 3, thereby improving its resistance to impact and deformation.

[0062] Optionally, the reinforcement portion 13 may be a reinforcement plate, the plate surface of which is parallel to the first direction and perpendicular to the second direction, that is, the plate surface of the reinforcement plate is parallel to the plate surface of the reinforcement rib in the second expansion beam 3 .

[0063] Alternatively, as Figure 7 As shown, the multiple reinforcing plates in the hollow tube 121 and the multiple reinforcing ribs in the second expansion beam 3 are arranged alternately to avoid interference between the two in the axial direction of the hollow tube 121, and to avoid mutual squeezing when the battery box is subjected to an impact force along the axial direction of the hollow tube 121.

[0064] The first tube wall 1211 and the second tube wall 1212 of the hollow tube 121 are each provided with a plurality of second connection points 122. The first tube wall 1211 is fastened to the first beam wall 32 via corresponding second connection points 122, and the second tube wall 1212 is fastened to the second beam wall 33 via corresponding second connection points 122. This provides stress points on both sides of the hollow tube 121, balancing the stresses when the battery case vibrates or is impacted, thus avoiding stress concentration.

[0065] In some embodiments of the present application, each second connection position 122 includes a third mounting hole 1221 and a second fastener 1222. A fourth mounting hole 34 is provided on the beam wall of the second expansion beam 3 at a position corresponding to the third mounting hole 1221. The second fastener 1222 is used to pass through the fourth mounting hole 34 of the third mounting hole 1221 to fasten the hollow tube 121 and the second expansion beam 3 together.

[0066] Optionally, the second fastener 1222 may include a rivet. Using rivets can achieve a high-strength and high-rigidity connection, and the connection point can withstand large loads, with good impact and vibration resistance. Furthermore, the riveting process is simple, easy to operate, and highly efficient. Exemplarily, the second fastener 1222 is a blind rivet.

[0067] Alternatively, the second fastener 1222 may include a bolt and a nut. The bolt passes through the third mounting hole 1221 and the fourth mounting hole 34 and is fastened by the nut. This connection method can cope with various load conditions, especially exhibiting good toughness and plasticity under dynamic loads.

[0068] Moreover, compared to the welding connection method used in the related art, the embodiment of the present application uses fasteners such as rivets or bolts to fasten the hollow tube 121 and the second expansion beam 3. This can reduce the impact of welding on the size of the second expansion beam 3, improve dimensional accuracy, further improve performance, and reduce production costs. Furthermore, the thermal effects of the welding connection method can also cause damage to the parent material structure of the second expansion beam 3, such as brittleness of the material near the weld, welding residual stress and deformation, etc. The embodiment of the present application eliminates the welding connection method and adopts a mechanical connection method. This can also reduce the heat-affected zone, avoid failure caused by the reduced impact resistance of the parent material itself, and make the battery box more stable and durable.

[0069] like Figure 5 As shown, in some embodiments of the present application, the centers of the multiple second connection positions 122 located on the first tube wall 1211 of the hollow tube 121 are not on the same straight line; and / or, the centers of the multiple second connection positions 122 located on the second tube wall 1212 of the hollow tube 121 are not on the same straight line.

[0070] In this way, a smaller number of second connection points 122 can be used to cover a larger stress-bearing area, so that when the second expansion beam 3 is impacted, the impact force can be quickly dispersed to different areas to avoid the impact force being concentrated in a local area.

[0071] Alternatively, as Figure 5 As shown, the plurality of second connection points 122 located on the first tube wall 1211 of the hollow tube 121 are alternately arranged on both sides of the center line of the first tube wall 1211. Figure 5 The dotted line drawn on the first tube wall 1211 in the figure indicates the center line of the first tube wall 1211 along the axial direction of the hollow tube 121. This arrangement ensures that the multiple second connection points 122 cover a larger stress-bearing area while also ensuring that the stress on both sides of the hollow tube 121 in the first direction is basically uniform.

[0072] Optionally, the plurality of second connection points 122 located on the second tube wall 1212 of the hollow tube 121 are alternately arranged on both sides of the center line of the second tube wall 1212 , wherein the center line of the second tube wall 1212 is parallel to the center line of the first tube wall 1211 .

[0073] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the battery case further includes a bottom plate 4, which is connected to the first expansion beam 2 and the second expansion beam 3, and is used to support and install the battery cells contained in the battery case. Exemplarily, the connection between the bottom plate 4 and the first expansion beam 2 and the second expansion beam 3 can be connected by fasteners.

[0074] Alternatively, as Figure 5 and Figure 7As shown, a third connection position 123 is further provided on the second tube wall 1212 , and the third connection position 123 is used to connect with the second expansion beam 3 and the bottom plate 4 .

[0075] Among them, the third connecting position 123 can include a fifth mounting hole 1231 and a third fastener 1232, a sixth mounting hole (not shown in the figure) is provided on the second beam wall 33 of the second expansion beam 3 at a position corresponding to the fifth mounting hole 1231, and a seventh mounting hole (not shown in the figure) is provided on the base plate 4 at a position corresponding to the sixth mounting hole, and the third fastener 1232 is used to pass through the fifth mounting hole 1231, the sixth mounting hole and the seventh mounting hole, and fasten the hollow tube 121, the second expansion beam 3 and the base plate 4 together.

[0076] Optionally, third fastener 1232 may comprise a rivet. Using rivets can achieve a high-strength and high-rigidity connection, and the connection point can withstand large loads, with good impact and vibration resistance. Furthermore, the riveting process is simple, easy to operate, and highly efficient. Exemplarily, third fastener 1232 is a blind rivet.

[0077] Optionally, the third fastener 1232 may include a screw; the fifth mounting hole 1231, the sixth mounting hole, and the seventh mounting hole are all threaded holes. The screw passes through the seventh mounting hole, the sixth mounting hole, and the fifth mounting hole 1231 in sequence to fasten the hollow tube 121, the second expansion beam 3, and the bottom plate 4.

[0078] Optionally, the third fastener 1232 may include a bolt and a nut. The bolt passes through the seventh mounting hole, the sixth mounting hole, and the fifth mounting hole 1231 in sequence and is fastened by the nut.

[0079] The above two optional connection methods can cope with various load conditions, especially showing good toughness and plasticity under dynamic loads. In addition, compared with rivet connection, the use of screws or bolts for fastening can be easily disassembled, facilitating the installation and maintenance of the base plate 4.

[0080] Optionally, the base plate 4 may be a liquid cooling plate with cooling liquid circulating inside for cooling the battery cells.

[0081] An embodiment of the present application further provides a battery pack, which includes the battery case described in any of the above embodiments, and a battery cell installed in the battery case.

[0082] The battery pack provided in the embodiment of the present application adopts the battery case described in the above embodiment, so the case structure has high strength, good impact resistance and deformation resistance, and is more stable and durable. It can effectively resist the expansion of the battery cells, while protecting the battery cells from impact damage and having a long service life.

[0083] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0084] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A battery box, characterized in that: The battery box comprises a connecting bracket (1), a first expansion beam (2) and a second expansion beam (3), wherein the second expansion beam (3) has an end opening (31) and an inner cavity (35); The connecting bracket (1) comprises an integrally formed first part (11) and a second part (12), wherein the first part (11) is firmly connected to the first expansion beam (2); and the second part (12) extends into the inner cavity (35) of the second expansion beam (3) through the end opening (31) and is firmly connected to the second expansion beam (3).

2. The battery box according to claim 1, characterized in that: The first part (11) of the connecting bracket (1) is a connecting plate (111), and the second part (12) of the connecting bracket (1) is a hollow tube (121), one end of the hollow tube (121) is connected to the plate surface of the connecting plate (111).

3. The battery box according to claim 2, characterized in that: The connecting plate (111) has a plate surface facing away from the hollow tube (121) in contact with the side wall (21) of the first expansion beam (2), and a plurality of first connection positions (112) are provided on the connecting plate (111). The plurality of first connection positions (112) are distributed on opposite sides of the hollow tube (121) and are respectively connected to the side wall (21) of the first expansion beam (2).

4. The battery box according to claim 3, characterized in that: The plurality of first connection positions (112) located on the same side of the hollow tube (121) are distributed in multiple rows and columns; Each of the first connection positions (112) includes a first mounting hole (1121) and a first fastener (1122); a second mounting hole (22) is provided on the side wall (21) of the first expansion beam (2) at a position corresponding to the first mounting hole (1121); and the first fastener (1122) is used to pass through the first mounting hole (1121) and the second mounting hole (22) and fasten the connection plate (111) and the first expansion beam (2).

5. The battery case according to claim 3 or 4, characterized in that: The hollow tube (121) is located in the middle of the connecting plate (111) in a first direction, the first direction being parallel to the length direction of the first expansion beam (2); and / or, The plurality of first connection positions (112) are symmetrically distributed on two opposite sides of the hollow tube (121) in the first direction.

6. The battery box according to claim 2, characterized in that: The second expansion beam (3) has a first beam wall (32) and a second beam wall (33) that are opposite to each other in a second direction, and the second direction is parallel to the height direction of the second expansion beam (3); The hollow tube (121) has a first tube wall (1211) and a second tube wall (1212) that are opposite to each other in the second direction, the first tube wall (1211) and the second tube wall (1212) are in surface contact with the first beam wall (32) and the second beam wall (33), respectively, and the first tube wall (1211) and the second tube wall (1212) are each provided with a plurality of second connection positions (122) that are respectively connected to corresponding beam walls on the second expansion beam (3).

7. The battery case according to claim 6, characterized in that: Each second connection position (122) includes a third mounting hole (1221) and a second fastener (1222); a fourth mounting hole (34) is provided on the beam wall of the second expansion beam (3) at a position corresponding to the third mounting hole (1221); the second fastener (1222) is used to pass through the third mounting hole (1221) and the fourth mounting hole (34) and fasten the hollow tube (121) and the second expansion beam (3).

8. The battery case according to claim 6 or 7, characterized in that: The centers of the plurality of second connection positions (122) located on the first tube wall (1211) are not on the same straight line; and / or the centers of the plurality of second connection positions (122) located on the second tube wall (1212) are not on the same straight line.

9. The battery case according to claim 6, characterized in that: The battery box includes a bottom plate (4); a third connection position (123) is also provided on the second tube wall (1212), and the third connection position (123) is used to connect with the second expansion beam (3) and the bottom plate (4).

10. The battery box according to claim 2, characterized in that: The connecting bracket (1) further comprises a reinforcing portion (13), wherein the reinforcing portion (13) is located inside the hollow tube (121) and is integrally formed with the hollow tube (121).

11. A battery pack, characterized in that: The battery pack includes the battery case according to any one of claims 1 to 10, and a battery cell installed in the battery case.

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