Battery pack side beam structure, battery pack, and manufacturing method of battery pack side beam structure

Abstract

The present invention relates to the field of battery technology, and discloses a battery pack side beam structure, a battery pack, and a method for manufacturing a battery pack side beam structure, wherein the battery pack side beam structure includes: a first side plate, a second side plate, and a bottom plate, the second side plate being arranged opposite to the first side plate; a bottom plate being connected to the lower ends of the first side plate and the second side plate, respectively; the first side plate and the second side plate each have a bent plate at one end away from the bottom plate, the bent plates on both sides are bent toward each other multiple times and extend toward the bottom plate, the free end of the bent plate of the first side plate is welded to the inner wall of the first side plate, the side of the bent plate of the second side plate close to the second side plate is welded to the inner wall of the second side plate, and the ends of the bent plates on both sides are welded close to each other. The present invention respectively arranges bent plates at one end of the first side plate and the second side plate away from the bottom plate, the bent plates are bent toward each other multiple times and extend toward the bottom plate and welded, which can effectively improve the anti-extrusion ability of the battery pack, and is simple to manufacture and has low cost.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack side beam structure, a battery pack, and a method for manufacturing the battery pack side beam structure. Background Art

[0002] Battery packs are widely used in outdoor energy storage cabinets and vehicles. The lower case of the battery pack is a key component, and its structural strength determines the safety performance of the battery pack.

[0003] Currently, the side beam structure of the battery pack's lower casing is typically made of lightweight aluminum alloy profiles through welding, casting, and other processes. However, the material properties of aluminum alloy profiles result in low structural strength, making it difficult to meet the structural strength requirements of the battery pack's lower casing. Summary of the Invention

[0004] In view of this, the present invention provides a battery pack side beam structure, a battery pack and a method for manufacturing a battery pack side beam structure to solve the problem that the battery pack side beam structure made of aluminum alloy profiles has low structural strength and is difficult to meet the strength requirements for use.

[0005] In a first aspect, the present invention provides a battery side beam structure, comprising:

[0006] first side panel;

[0007] a second side panel, arranged opposite to the first side panel;

[0008] a bottom plate connected to the lower ends of the first side plate and the second side plate respectively;

[0009] The first side panel and the second side panel each have a bent plate at one end away from the bottom panel, the bent plates on both sides are bent toward each other multiple times and extend toward the bottom panel, the free end of the bent plate of the first side panel is welded to the inner wall of the first side panel, the side of the bent plate of the second side panel close to the second side panel is welded to the inner wall of the second side panel, and the ends of the bent plates on both sides close to each other are welded.

[0010] Beneficial effects: The battery pack side beam structure of the present invention has a bent plate provided at one end of the first side plate and the second side plate away from the bottom plate. The bent plates are bent toward each other multiple times and extend toward the bottom plate. The two bent plates are welded at their ends close to each other. The two bent plates are welded to the first side plate and the second side plate, respectively, so that the bottom plate, the first side plate, the second side plate and the two bent plates can support each other and disperse the extrusion force. The structure has high strength and good anti-extrusion ability, which can meet the use requirements of the battery pack. Moreover, the manufacturing process is simpler than traditional welding and casting, and the use cost is low. The shape of the side beam structure can be adjusted according to the type of battery pack, which is flexible to use and widely applicable.

[0011] In an optional embodiment, the height H1 of the first side panel and the height H2 of the second side panel satisfy 1 / 2H2≤H1≤2 / 3H2, and H2≥30 mm.

[0012] Beneficial effect: The second side plate is used to abut against the electrode group. By limiting the height of the second side plate and the relative relationship between the first side plate and the second side plate, it is possible to ensure that the second side plate and the electrode group have a sufficiently large contact area, thereby improving the anti-extrusion ability of the battery pack.

[0013] In an optional embodiment, the bent plate of the second side panel and the second side panel form a first cavity, the bent plate of the second side panel and the bent plate of the first side panel form a second cavity located below the first cavity, the cross-section of the first cavity is triangular, and the cross-section of the second cavity is rectangular.

[0014] Beneficial effects: The bent plate of the second side panel and the second side panel form a first cavity with a triangular cross-section, which has strong structural stability, can save materials, and is easy to form and process. The bent plate of the second side panel and the bent plate of the first side panel form a second cavity with a rectangular cross-section located below the first cavity, which is easy to weld the two side panels.

[0015] In an optional embodiment, the corners of the triangular cross-section of the first cavity are bent to form arcs, and the radius R of the arc is ≥3 mm.

[0016] Beneficial effects: By bending the triangular cross-section corners of the first cavity to form an arc and limiting the radius of the arc, the stress concentration at the corners of the triangular cross-section can be reduced, the stress can be effectively dispersed, the risk of fracture of the second side plate and the bent plate of the second side plate can be reduced, the compressive resistance of the battery side beam structure can be improved, and it is easy to process.

[0017] In an optional embodiment, the height H2 of the second side plate and the height H3 of the first cavity satisfy 3 / 2H3≤H2≤2H3.

[0018] Beneficial effect: The bent plate of the second side plate is arranged at a middle position close to the second side plate, and the force is evenly distributed, which can effectively disperse the extrusion force.

[0019] In an optional embodiment, the bent plate of the first side panel and the first side panel enclose a third cavity, and the third cavity is provided with a hypotenuse welded to a corner of the triangular cross section of the first cavity.

[0020] Beneficial effect: The third cavity is provided with a beveled edge welded to the corner of the triangular section of the first cavity, which facilitates welding of the two. The bent plate of the first side panel and the first side panel form the third cavity to further enhance the structural strength of the side beam structure.

[0021] In an optional embodiment, the bent plate of the first side panel, the bent plate of the second side panel and the bottom plate form a fourth cavity located below the third cavity and the second cavity, and the height H1 of the first side panel and the height H4 of the fourth cavity satisfy 3 / 2H4≤H1≤2H4.

[0022] Beneficial Effects: After the first, second, and third cavities are completed through rolling and welding, the bent plate of the first side panel, the bent plate of the second side panel, and the bottom panel enclose a fourth cavity. This allows for rapid molding without the need for additional processing, effectively reducing manufacturing costs. By defining the relationship between the height of the first side panel and the height of the fourth cavity, the bent plate of the first side panel can be welded near the center of the second side panel, evenly distributing the force, further distributing the extrusion force, and improving structural strength.

[0023] In an optional embodiment, the width W1 of the bottom plate, the width W2 of the second cavity, and the minimum width W3 of the third cavity satisfy 1 / 3W1≤W2=W3≤1 / 2W1.

[0024] Beneficial effect: By limiting the relationship between the width of the bottom plate, the width of the second cavity and the minimum width of the third cavity, the strength of the area where the battery side beam structure is prone to deformation can be enhanced, further reducing application concentration and improving the anti-extrusion ability of the battery side beam structure.

[0025] In a second aspect, the present invention further provides a battery pack, comprising: a housing and at least one electrode group, wherein the at least one electrode group is mounted in a receiving cavity of the housing, and the housing comprises:

[0026] bottom shell;

[0027] The battery package side beam structure is arranged around the four sides of the bottom shell and forms the accommodating cavity with the bottom shell.

[0028] Beneficial effect: Because the battery pack includes a battery pack side beam structure, it has the same effect as the battery pack side beam structure and will not be described in detail here.

[0029] In a third aspect, the present invention further provides a method for manufacturing a battery side beam structure, comprising:

[0030] Prepare edge beam profiles;

[0031] Rolling the edge beam profile to form a bottom plate and a first side plate and a second side plate located on opposite sides of the bottom plate;

[0032] Rolling the ends of the first side plate and the second side plate away from the bottom plate to form two bent plates that are bent toward each other and extend toward the bottom plate;

[0033] The free end of the bent plate of the first side plate and the inner wall of the first side plate, the side of the bent plate of the second side plate close to the second side plate and the inner wall of the second side plate, and the ends of the bent plates on both sides close to each other are welded respectively.

[0034] Beneficial effects: The method for manufacturing the battery pack side beam structure of the present invention uses a high-strength side beam profile as a base material, and through rolling and welding processes, the side beam profile is made into a bottom plate, a first side plate and a second side plate located on opposite sides of the bottom plate, and bent plates at both ends of the first side plate and the second side plate away from the bottom plate. Compared with traditional welding and casting processes, the method is simple to manufacture and has a low cost. Moreover, the bent plates are bent toward each other multiple times and extend toward the bottom plate, and the ends of the two bent plates close to each other are welded. The two bent plates are respectively welded to the first side plate and the second side plate, so that the bottom plate, the first side plate, the second side plate and the two bent plates can support each other and disperse the extrusion force. The structure has high strength and good anti-extrusion ability, which can meet the use requirements of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic structural diagram of a battery side beam structure according to an embodiment of the present invention;

[0037] Figure 2 This is a cross-sectional view of a battery side beam structure according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. First side panel; 2. Second side panel; 3. Bottom panel; 4. Bending panel; 5. First cavity; 6. Second cavity; 7. Third cavity; 8. Fourth cavity. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following combination Figures 1 to 2 , describing embodiments of the present invention.

[0042] According to an embodiment of the present invention, on the one hand, Figure 1 As shown, a battery pack side beam structure is provided, which mainly includes: a first side plate 1, a second side plate 2 and a bottom plate 3. The second side plate 2 is arranged opposite to the first side plate 1. The bottom plate 3 is connected to the lower ends of the first side plate 1 and the second side plate 2, respectively. The first side plate 1 and the second side plate 2 have a bending plate 4 at one end away from the bottom plate 3, respectively. The bending plates 4 on both sides are bent toward each other for many times and extend toward the bottom plate 3. The free end of the bending plate 4 of the first side plate 1 is welded to the inner wall of the first side plate 1, and the side of the bending plate 4 of the second side plate 2 close to the second side plate 2 is welded to the inner wall of the second side plate 2, and the ends of the bending plates 4 on both sides are welded close to each other.

[0043] It can be seen that the battery pack side beam structure provided by the embodiment of the present invention has a bent plate 4 provided at one end of the first side plate 1 and the second side plate 2 away from the bottom plate 3. The bent plates 4 are bent toward each other multiple times and extend toward the bottom plate 3. The two bent plates 4 are welded at their ends close to each other. The two bent plates 4 are welded to the first side plate 1 and the second side plate 2, respectively, so that the bottom plate 3, the first side plate 1, the second side plate 2 and the two bent plates 4 can support each other and disperse the extrusion force. The structure has high strength and good anti-extrusion ability, which can meet the use requirements of the battery pack. Moreover, the manufacturing process is simpler than traditional welding, casting, etc., and the use cost is low.

[0044] In order to improve the structural strength of the battery pack side beam structure made of traditional aluminum alloy materials, the size of the aluminum alloy is generally thickened, which requires occupying more space in the battery pack and increasing the weight of the battery pack. The battery pack design is more difficult and the scope of use is limited.

[0045] The battery pack side beam structure of the embodiment of the present invention is made of a side beam profile. By rolling the opposite sides of the side beam profile, a first side panel 1 and a second side panel 2 that are oppositely arranged, and a bottom panel 3 connected to the lower ends of the first side panel 1 and the second side panel 2 can be formed. That is, the first side panel 1, the second side panel 2 and the bottom panel 3 can be formed in one piece. In addition, each bent portion of the two bent plates 4 can be achieved by rolling, and then welded after the rolling is completed. The production is simple, the connection is firm, and the structure is stable. The side beam profile can be made of sheet metal, and the thickness can be less than 1.2 mm. There is no need to set up a mold, which has lower use costs and lower processing difficulty. There is no need to increase the thickness of the material, so the space occupied is smaller, and the shape of the battery pack side beam structure can be adjusted according to the type of battery pack, which is flexible to use and has a wide range of applications.

[0046] In one embodiment, Figure 2 As shown, the height H1 of the first side panel 1 and the height H2 of the second side panel 2 satisfy 1 / 2H2≤H1≤2 / 3H2, and H2≥30mm. For example, H2 is 30mm and H1 is 20mm. Alternatively, H2 is 40mm and H1 is 20mm.

[0047] Taking the application of the battery pack in a vehicle as an example, the first side plate 1 is used to abut against the vehicle body, and the second side plate 2 is used to abut against the electrode group. By limiting the height of the second side plate 2 and the relative relationship between the first side plate 1 and the second side plate 2, it is possible to ensure that the second side plate 2 has a sufficiently large contact area with the electrode group, thereby improving the battery pack's anti-extrusion ability.

[0048] In addition, the first side panel 1 and the second side panel 2 can be respectively perpendicular to the bottom panel 3 for ease of use, and rounded corners are respectively provided at the connections between the first side panel 1 and the second side panel 2 and the bottom panel 3 to further reduce stress concentration, improve fatigue resistance, enhance impact resistance and seismic resistance, and at the same time improve the overall stability and durability of the battery pack side beam structure.

[0049] The height direction of the embodiment of the present invention is as follows Figure 2 As shown by the arrow H in , that is, the up and down directions.

[0050] Furthermore, in one embodiment, Figure 2 As shown, the bent plate 4 of the second side panel 2 and the second side panel 2 form a first cavity 5, and the bent plate 4 of the second side panel 2 and the bent plate 4 of the first side panel 1 form a second cavity 6 located below the first cavity 5. The cross-section of the first cavity 5 is triangular, and the cross-section of the second cavity 6 is rectangular.

[0051] The bent plate 4 of the second side panel 2 of the embodiment of the present invention and the second side panel 2 form a first cavity 5 with a triangular cross-section, which has strong structural stability, can save materials, and is easy to form and process. The bent plate 4 of the second side panel 2 and the bent plate 4 of the first side panel 1 form a second cavity 6 with a rectangular cross-section located below the first cavity 5, which is easy to weld the two side panels.

[0052] Furthermore, in one embodiment, Figure 2 As shown, the triangular cross-section of the first cavity 5 is bent at the corner to form an arc, and the radius of the arc R is ≥ 3mm. By bending the triangular cross-section of the first cavity 5 to form an arc at the corner and limiting the radius of the arc, it is possible to reduce stress concentration at the corner of the triangular cross-section, effectively disperse the stress, reduce the risk of fracture of the second side plate 2 and the bent plate 4 of the second side plate 2, improve the compressive strength of the battery side beam structure, and facilitate processing.

[0053] Specifically, the cross section of the first cavity 5 is a right triangle, the second side panel 2 serves as a right angle, and the connection between the bent plate 4 of the second side panel 2 and the second side panel 2 is bent to form an arc. In addition, each bent portion of the bent plate 4 of the second side panel 2 can form an arc.

[0054] In one embodiment, Figure 2 As shown, the height H2 of the second side panel 2 and the height H3 of the first cavity 5 satisfy the condition 3 / 2H3 ≤ H2 ≤ 2H3. For example, H2 = 2H3, or H2 = 3 / 2H3. The bent plate 4 of the second side panel 2 is positioned near the center of the second side panel 2, providing uniform force distribution and effectively distributing the extrusion force, thereby enhancing the structural strength of the first cavity 5.

[0055] In one embodiment, Figure 2 As shown, the bent plate 4 of the first side panel 1 and the first side panel 1 enclose a third cavity 7, and the third cavity 7 is provided with a hypotenuse welded to the corner of the triangular cross-section of the first cavity 5. The triangular cross-section of the first cavity 5 is also tilted downward away from the corner of the second side panel 2 to form a welding surface. The hypotenuse of the third cavity 7 is welded and fixed to the welding surface. The third cavity 7 is provided with a hypotenuse welded to the corner of the triangular cross-section of the first cavity 5 to facilitate welding of the two. The bent plate 4 of the first side panel 1 and the first side panel 1 enclose the third cavity 7 to further enhance the structural strength of the side beam structure.

[0056] Specifically, if Figure 2As shown, the cross-section of the third cavity 7 is a pentagon with two relatively parallel sets of sides, and the other side is a hypotenuse. The hypotenuse is welded to the corner of the triangular cross-section, and the welding length is L1, L1 ≥ 5mm. The side connected to the lower end of the hypotenuse is welded to the free end of the bent plate 4 of the second side panel 2, and the welding length is L2, L2 ≥ 5mm. The side of the rectangular cross-section of the second cavity 6 close to the second side panel 2 is welded to the inner wall of the second side panel 2, and the welding length is L3, L3 ≥ 5mm. The free end of the bent plate 4 of the first side panel 1 faces away from the third cavity 7 and extends toward the bottom plate 3, and is welded to the inner wall of the first side panel 1, and the welding length is L4, L4 ≥ 5mm. Each bend of the bent plate 4 of the first side panel 1 can also form an arc to further reduce stress concentration.

[0057] In one embodiment, Figure 2 As shown, the bent plate 4 of the first side panel 1, the bent plate 4 of the second side panel 2 and the bottom panel 3 form a fourth cavity 8 located below the third cavity 7 and the second cavity 6. The height H1 of the first side panel 1 and the height H4 of the fourth cavity 8 satisfy 3 / 2H4≤H1≤2H4. For example, H1=2H4, or H1=3 / 2H4. After the first cavity 5, the second cavity 6 and the third cavity 7 are completed by rolling and welding, the bent plate 4 of the first side panel 1, the bent plate 4 of the second side panel 2 and the bottom panel 3 form the fourth cavity 8. The forming speed is fast, no additional processing is required, and the manufacturing cost can be effectively reduced. By limiting the relationship between the height of the first side panel 1 and the height of the fourth cavity 8, the bent plate 4 of the first side panel 1 can be welded in the middle position close to the second side panel 2, with uniform force, further dispersing the extrusion force and improving the structural strength.

[0058] It should be noted that during the stress-bearing process of the first side panel 1 and the second side panel 2, the positions at one-half, one-third, and two-thirds are usually key locations for stress concentration or stress transmission. The top of the bent plate 4 of the first side panel 1 is parallel to the bottom panel 3, so that the force during extrusion is concentrated at the position at two-thirds of the height of the second side panel 2. At the same time, a portion of the bent plate 4 is welded and fixed in the middle area of ​​the first side panel 1 and the second side panel 2, so that the two bent plates 4 can strengthen the anti-extrusion ability of the battery side beam structure and improve the structural strength.

[0059] In one embodiment, Figure 2 As shown, the width W1 of the base plate 3, the width W2 of the second cavity 6, and the minimum width W3 of the third cavity 7 satisfy 1 / 3W1≤W2=W3≤1 / 2W1. By defining the relationship between the width of the base plate 3, the width of the second cavity 6, and the minimum width of the third cavity 7, the strength of the side beam structure in areas prone to deformation can be strengthened, further reducing application concentration and improving the side beam structure's anti-extrusion capability and structural strength.

[0060] The width direction of the embodiment of the present invention is as follows Figure 2 As shown by the arrow W in .

[0061] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising: a shell and at least one pole group, wherein the at least one pole group is installed in a receiving cavity of the shell, and the shell comprises: a bottom shell and a battery pack side beam structure, wherein the battery pack side beam structure is arranged around the bottom shell and forms a receiving cavity with the bottom shell.

[0062] Because the battery pack includes a battery pack side beam structure, it has the same effect as the battery pack side beam structure and will not be described in detail here.

[0063] Taking the application of the battery pack in a vehicle as an example, the bottom shell is fixed under the vehicle floor, the first side plate abuts against the vehicle shell, and the second side plate abuts against the electrode group in the accommodating cavity.

[0064] To achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a heat dissipation system, wires, etc. It should be noted that the other necessary modules or components included in the battery pack can be of any suitable existing structure. To clearly and briefly illustrate the technical solution provided by this embodiment, the above-mentioned parts will not be described in detail here, and the drawings in the specification have been simplified accordingly. However, it should be understood that the scope of the embodiments of the present invention is not limited by this.

[0065] According to another aspect of an embodiment of the present invention, a method for manufacturing a battery side beam structure is provided, comprising:

[0066] S100. Prepare side beam profiles.

[0067] S200 , rolling the side beam profile to form a bottom plate 3 and a first side plate 1 and a second side plate 2 located on opposite sides of the bottom plate 3 .

[0068] S300 , rolling the ends of the first side plate 1 and the second side plate 2 away from the bottom plate 3 to form two bent plates 4 that are bent toward each other and extend toward the bottom plate 3 .

[0069] S400, weld the free end of the bent plate 4 of the first side panel 1 and the inner wall of the first side panel 1, the side of the bent plate 4 of the second side panel 2 close to the second side panel 2 and the inner wall of the second side panel 2, and the ends of the bent plates 4 on both sides close to each other respectively.

[0070] It can be seen that the method for manufacturing the battery pack side beam structure provided by the embodiment of the present invention uses a high-strength side beam profile as a base material, and through rolling and welding processes, the side beam profile is made into a bottom plate 3, a first side plate 1 and a second side plate 2 located on opposite sides of the bottom plate 3, and bent plates 4 at both ends of the first side plate 1 and the second side plate 2 away from the bottom plate 3. Compared with traditional welding and casting processes, the method is simple to manufacture and has low cost. Moreover, the bent plates 4 are bent toward each other many times and extend toward the bottom plate 3. The ends of the two bent plates 4 close to each other are welded, and the two bent plates 4 are respectively welded to the first side plate 1 and the second side plate 2, so that the bottom plate 3, the first side plate 1, the second side plate 2 and the two bent plates 4 can support each other and disperse the extrusion force. The structural strength is high, it has good anti-extrusion ability, and can meet the use requirements of the battery pack.

[0071] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery pack side beam structure, characterized in that: include: first side panel; a second side panel, arranged opposite to the first side panel; a bottom plate connected to the lower ends of the first side plate and the second side plate respectively; The first side panel and the second side panel each have a bent plate at one end away from the bottom panel, the bent plates on both sides are bent multiple times toward each other and extend toward the bottom panel, the free end of the bent plate of the first side panel is welded to the inner wall of the first side panel, the side of the bent plate of the second side panel close to the second side panel is welded to the inner wall of the second side panel, and the ends of the bent plates on both sides close to each other are welded; The height H1 of the first side panel and the height H2 of the second side panel satisfy 1 / 2H2≤H1≤2 / 3H2, and H2≥30 mm.

2. The battery pack side beam structure according to claim 1, characterized in that: The bent plate of the second side panel and the second side panel form a first cavity, and the bent plate of the second side panel and the bent plate of the first side panel form a second cavity located below the first cavity. The cross-section of the first cavity is triangular, and the cross-section of the second cavity is rectangular.

3. The battery pack side beam structure according to claim 2, characterized in that: The triangular cross-section of the first cavity is bent at a corner to form an arc, and the radius of the arc is R ≥ 3 mm.

4. The battery pack side beam structure according to claim 2, characterized in that: The height H2 of the second side plate and the height H3 of the first cavity satisfy 3 / 2H3≤H2≤2H3.

5. The battery pack side beam structure according to claim 2, characterized in that: The bent plate of the first side plate and the first side plate form a third cavity, and the third cavity is provided with a hypotenuse welded to the corner of the triangular cross section of the first cavity.

6. The battery pack side beam structure according to claim 5, characterized in that: The bent plate of the first side plate, the bent plate of the second side plate and the bottom plate form a fourth cavity located below the third cavity and the second cavity. The height H1 of the first side plate and the height H4 of the fourth cavity satisfy 3 / 2H4≤H1≤2H4.

7. The battery pack side beam structure according to claim 5, characterized in that: The width W1 of the bottom plate, the width W2 of the second cavity, and the minimum width W3 of the third cavity satisfy 1 / 3W1≤W2=W3≤1 / 2W1.

8. A battery pack, characterized in that: include: A housing and at least one pole group, wherein at least one pole group is installed in a receiving cavity of the housing, and the housing comprises: bottom shell; The battery package side beam structure according to any one of claims 1 to 7, wherein the battery package side beam structure is arranged around the four sides of the bottom shell and forms the accommodating cavity with the bottom shell.

9. A method for manufacturing a battery side beam structure, characterized in that: include: Prepare edge beam profiles; Rolling the edge beam profile to form a bottom plate and a first side plate and a second side plate located on opposite sides of the bottom plate; Rolling the ends of the first side plate and the second side plate away from the bottom plate to form two bent plates that are bent toward each other and extend toward the bottom plate; Welding the free end of the bent plate of the first side plate and the inner wall of the first side plate, the side of the bent plate of the second side plate close to the second side plate and the inner wall of the second side plate, and the ends of the bent plates on both sides close to each other respectively; The height H1 of the first side panel and the height H2 of the second side panel satisfy 1 / 2H2≤H1≤2 / 3H2, and H2≥30 mm.

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