Battery case, battery pack, electric device and battery case processing method

Abstract

A battery case, a battery pack, an electric device and a battery case processing method. The battery case comprises: a case structure (10), which has an accommodating cavity (11) inside, wherein the accommodating cavity (11) has a first fitting surface (12) abutting against and fitting with a battery cell, and the first fitting surface (12) has a ventilation hole (13); a bearing beam (20), wherein one end of the bearing beam (20) in the extension direction thereof is a first end (21), and the first end (21) faces the first fitting surface (12); and an explosion-proof pressure relief valve (30), wherein the first end (21) is projected to the first fitting surface (12) in the extension direction of the bearing beam (20) to form a first projection, and at least part of the ventilation hole (13) is located within the first projection and communicates with the accommodating cavity (11).

Description

Battery boxes, battery packs, electrical equipment, and battery box processing methods

[0001] This application claims priority to Chinese Patent Application No. 202411063192.0, filed on August 2, 2024, and Chinese Patent Application No. 202421873289.3, filed on August 2, 2024, the entire contents of which are incorporated herein by reference.

[0002] Technical Field

[0003] This application relates to the field of power battery technology, for example, to a battery box, battery pack, electrical equipment, and a method for processing the battery box.

[0004] Background Technology

[0005] With the continuous development of society and economy and the constant innovation of science and technology, power batteries, with their advantages of high voltage, high energy, small size, and wide operating temperature range, are widely used in electric vehicles. At the same time, battery safety has become a focus of social concern. When a cell in a battery pack experiences thermal runaway, it generates high-temperature, high-pressure gases and molten materials, which can adversely affect other components within the battery pack, such as electrical connectors, low-voltage wiring harnesses, and other cells, easily leading to thermal runaway or arcing accidents in adjacent cells. To prevent these accidents, explosion-proof valves are typically installed on the battery pack. When high-temperature, high-pressure gases and molten materials appear inside the pack, the explosion-proof valve connects the inside of the battery pack to the outside, allowing the gases and materials to escape from the battery pack.

[0006] Technical issues

[0007] The densely packed battery cells inside the battery pack, tightly fitting against all surfaces, result in poor air permeability at these surfaces. This is particularly true for the anti-expansion beams inside the battery pack, which are designed to withstand the expansion forces of the cells (the main direction of these forces is usually the same as the direction in which the cells are arranged sequentially). The contact surfaces on these beams are in direct, tight contact with the cells, further contributing to poor air permeability. Furthermore, the air passages connecting to the explosion-proof valve are typically located on one or more contact surfaces inside the battery pack, resulting in poor connectivity between the explosion-proof valve and the outside of the battery pack (and also poor performance in venting high-temperature, high-pressure gases and molten materials). This frequently leads to jamming or blockage when the explosion-proof valve needs to be opened, ultimately compromising the safety of the battery pack.

[0008] Technical solutions

[0009] According to one aspect of this application, a battery box is provided, comprising: a box structure having an internal cavity for accommodating battery cells; the cavity having a first mating surface that abuts against the battery cells, and a vent hole on the first mating surface; a supporting beam fixedly disposed within the cavity for supporting the box structure; one end of the supporting beam along its extension direction being a first end, the first end facing the first mating surface; and an explosion-proof pressure regulating valve disposed outside the cavity and communicating with the vent hole; wherein the first end is projected along the extension direction of the supporting beam onto the first mating surface to form a first projection, and at least a portion of the vent hole is located within the first projection and communicating with the cavity.

[0010] According to another aspect of this application, a battery pack is provided, the battery pack including a battery box in any embodiment, the battery pack also including a plurality of battery cells, the plurality of battery cells being arranged in rows and columns in a receiving cavity and being limited and engaged with the inner wall of the receiving cavity; wherein, a portion of the battery cells abut against a first contact surface.

[0011] According to another aspect of this application, an electrical device is provided, which includes a battery pack in any embodiment, and the electrical device also includes a mobile frame on which the battery pack is fixed.

[0012] According to another aspect of this application, a battery box processing method is provided, which is used to process the battery box in any embodiment; the battery box processing method includes: steel structure processing: processing the box structure with steel material, integrally forming it and then performing electrophoretic treatment to form a protective layer; aluminum structure processing: processing the load-bearing beam with aluminum alloy material; assembly: after the steel structure processing and aluminum structure processing are completed, assembling and / or welding the obtained structures to form the box structure and fix the load-bearing beam in the receiving cavity.

[0013] According to another aspect of this application, a battery box processing method is provided. This method is used to process a battery box in any embodiment. The box structure includes a box frame and a rear beam, the rear beam being fixedly mounted on the box frame. The space surrounding the box frame and the rear beam together forms a receiving cavity. A first mating surface is located on the rear beam. The battery box also includes at least one anti-expansion beam. The anti-expansion beam has a second mating surface that abuts against the battery cell. The battery box processing method includes: steel structure processing: processing the box frame using steel material, and performing electrophoretic treatment after forming to form a protective layer; aluminum structure processing: processing the rear beam, load-bearing beam, and anti-expansion beam using aluminum alloy material respectively; assembly: after the steel structure processing and aluminum structure processing are completed, assembling and / or welding the obtained structures to form the box structure and fixing the load-bearing beam and anti-expansion beam within the receiving cavity.

[0014] Beneficial effects

[0015] In some embodiments of this application, by setting at least a portion of the vent hole within the first projection, at least a portion of the vent hole is not blocked by the battery cell attached to the first bonding surface, ensuring reliable communication between the vent hole and the receiving cavity, improving the permeability of the first bonding surface, and thus improving the communication between the explosion-proof pressure relief valve and the outside of the battery box. This allows the high-temperature and high-pressure gas and molten material generated in the receiving cavity to be smoothly discharged, and external gas to be smoothly introduced into the receiving cavity to balance the pressure. In situations where the explosion-proof pressure relief valve needs to be opened, jamming or blockage is avoided, providing structural support for improving the safety of the battery pack. This application creatively designs the relative positional relationship between the vent hole and the supporting beam, resulting in a simple structure and reliable venting, which facilitates the installation of the explosion-proof pressure relief valve and ensures the rationality of fluid flow within the receiving cavity.

[0016] Attached Figure Description

[0017] Figure 1 shows a partial structural schematic diagram of the battery box provided by some implementations of this application;

[0018] Figure 2 shows a magnified view of part A in Figure 1;

[0019] Figure 3 shows a partial enlarged view of the structure at point A in Figure 1 after the air guide structure has been assembled;

[0020] Figure 4 shows a schematic diagram of the internal structure of the battery box provided by some implementations of this application from a side view angle;

[0021] Figure 5 shows a magnified view of part B in Figure 4;

[0022] Figure 6 shows a three-dimensional structural diagram of the gas guiding structure and the explosion-proof pressure regulating valve provided by some implementations of this application;

[0023] Figure 7 shows a schematic diagram of the gas guiding structure and the internal structure of the explosion-proof pressure regulating valve provided by some implementations of this application;

[0024] Figure 8 shows a schematic diagram of the external structure of the box frame and rear beam provided by some implementations of this application;

[0025] Figure 9 shows a magnified view of a portion of point C in Figure 8;

[0026] Figure 10 shows a schematic diagram of the battery pack structure provided by some implementations of this application;

[0027] Figure 11 shows a magnified view of a portion of point D in Figure 10;

[0028] Figure 12 shows a partial structural schematic diagram of the battery pack provided by some implementations of this application;

[0029] Figure 13 shows a magnified view of a portion of point E in Figure 12;

[0030] Figure 14 shows a schematic diagram of the structure of the electrical equipment provided by some implementations of this application.

[0031] The above figures include the following reference numerals:

[0032] 10. Box structure; 11. Receiving cavity; 12. First mating surface; 13. Ventilation hole; 14. Box frame; 15. Rear beam; 151. Protective space; 16. Front beam; 17. Side beam;

[0033] 20. Load-bearing beam; 21. First end; 22. Second end; 23. First through hole;

[0034] 30. Explosion-proof pressure regulating valve; 31. Sealing mounting groove;

[0035] 40. Air guiding structure; 41. Flow channel; 42. Second through hole; 43. Hollowed-out space; 44. Auxiliary flow hole;

[0036] 50. Connectors;

[0037] 60. First fastener;

[0038] 70. Sealing ring;

[0039] 80. Card slot; 81. Card slot base; 82. Card slot folded edge;

[0040] 90. Anti-expansion beam; 91. Second bonding surface; 92. First beam; 93. Second beam;

[0041] 100. Cross-shaped connection structure;

[0042] 110. Battery cells;

[0043] 120. Mounted beam;

[0044] 200. Electrical equipment; 210. Battery pack; 220. Mobile frame; 221. Front of vehicle; 222. Rear of vehicle.

[0045] Embodiments of the present invention

[0046] The embodiments of this application will now be described with reference to the accompanying drawings. These embodiments are some related to this application.

[0047] As shown in Figures 1 to 13, an embodiment of this application provides a battery box, including: a box structure 10, having an internal cavity 11 for accommodating battery cells 110; the cavity 11 having a first mating surface 12 that abuts against the battery cells 110, and a vent hole 13 on the first mating surface 12; a supporting beam 20, fixedly disposed within the cavity 11, for supporting the box structure 10; one end of the supporting beam 20 along its extension direction is a first end 21, the first end 21 facing the first mating surface 12; an explosion-proof pressure regulating valve 30, disposed outside the cavity 11 and communicating with the vent hole 13; wherein, the first end 21 is projected onto the first mating surface 12 along the extension direction of the supporting beam 20 to form a first projection, and at least a portion of the vent hole 13 is located within the first projection and communicates with the cavity 11.

[0048] This application sets at least a portion of the vent hole 13 within the first projection and connects it to the space between the first end 21 and the first mating surface 12. This ensures that at least a portion of the vent hole 13 is not blocked by the battery cell 110 attached to the first mating surface 12, guaranteeing reliable communication between the vent hole 13 and the receiving cavity 11. This improves the permeability of the first mating surface 12, thereby enhancing the communication between the explosion-proof pressure relief valve 30 and the outside of the battery box. This allows the high-temperature and high-pressure gas and molten material generated in the receiving cavity 11 to be discharged smoothly, and external gas to enter the receiving cavity 11 smoothly to balance the pressure. In situations where the explosion-proof pressure relief valve (i.e., the explosion-proof pressure relief valve 30) needs to be opened, it avoids jamming or blockage, providing structural support for improving the safety of the battery pack. This application creatively designs the relative positional relationship between the vent hole 13 and the supporting beam 20, resulting in a simple structure and reliable venting. This facilitates the installation of the explosion-proof pressure relief valve and ensures the rationality of fluid flow within the receiving cavity 11.

[0049] For example, the first end 21 is spaced apart from the first mating surface 12 so that the vent hole 13 communicates with the space between the first end 21 and the first mating surface 12; or, the supporting beam 20 has a venting channel, the two ends of which are respectively connected to the vent hole 13 and the receiving cavity 11. This arrangement allows the vent hole 13 to communicate directly or indirectly with the receiving cavity 11, ensuring the venting permeability of the vent hole 13.

[0050] As shown in Figures 1, 2 and 3, the battery box also includes a venting structure 40, which passes through a vent hole 13. An explosion-proof pressure regulating valve 30 is located at one end of the venting structure 40. The venting structure 40 has a flow channel 41 inside, which is connected to the receiving cavity 11 and the explosion-proof pressure regulating valve 30.

[0051] By setting the air guiding structure 40 to have a flow channel 41 inside, reliable communication between the receiving cavity 11 and the explosion-proof pressure regulating valve 30 is ensured.

[0052] In some embodiments of this application, the receiving cavity 11 includes a pressure relief channel within the housing structure 10 for the flow of ejected material, so that the ejected material generated by the battery cell 110 located in the battery box can flow out of the receiving cavity 11 in a timely manner, ensuring safety.

[0053] As shown in Figures 1, 2 and 3, one end of the air guiding structure 40 located in the receiving cavity 11 is connected to the first end 21 to support the bearing beam 20; the air guiding structure 40 is limited and fitted with the inner wall of the vent hole 13; wherein, the end of the air guiding structure 40 located in the receiving cavity 11 is projected along the extension direction of the bearing beam 20 onto the first mating surface 12 to form a second projection, the second projection coincides with the first projection or is located within the first projection.

[0054] By setting one end of the air guiding structure 40 located in the receiving cavity 11 to be connected to the first end 21 of the supporting beam 20, reliable support for the supporting beam 20 is achieved, thereby ensuring the stability and firmness of the supporting beam 20; by setting the second projection to coincide with or be located within the first projection, the end of the air guiding structure 40 located in the receiving cavity 11 does not directly contact the battery cell 110, thereby avoiding contact with the battery cell 110.

[0055] As shown in Figures 1, 2, 3, 4 and 5, the first end 21 of the supporting beam 20 has a cavity inside, and one end of the air guiding structure 40 located in the receiving cavity 11 extends into the cavity; the battery box also includes a connector 50, which is connected to the air guiding structure 40 and the supporting beam 20 respectively.

[0056] By setting the connector 50 to connect with the air guiding structure 40 and the load-bearing beam 20 respectively, the connection strength between the air guiding structure 40 and the cavity is improved.

[0057] In some embodiments of this application, the connector 50 is a rivet or screw to facilitate installation and control costs.

[0058] Optionally, the first end 21 also has a stepped first through hole 23; the air guiding structure 40 has a second through hole 42, and the first through hole 23 and the second through hole 42 are connected accordingly; the first end of the connector 50 passes through the first through hole 23 and is engaged with the inner wall of the second through hole 42; the second end of the connector 50 is located in the first through hole 23 and is engaged with the stepped surface in the first through hole 23.

[0059] By setting the first through hole 23 as a stepped hole, reliable storage of the second end of the connector 50 is achieved, thereby ensuring the smoothness and flatness of the side wall of the first end 21, which facilitates subsequent close cooperation with the battery cell 110.

[0060] As shown in Figures 4, 5, 6, and 7, the first end 21 also has multiple first through holes 23, which communicate with the cavity; the air guiding structure 40 has multiple second through holes 42 at one end located in the receiving cavity 11, and the multiple first through holes 23 and the multiple second through holes 42 are connected in a one-to-one correspondence; there are multiple connectors 50, and the multiple connectors 50 are matched with the multiple first through holes 23 in a one-to-one correspondence; one end of a connector 50 passes through a first through hole 23 and matches with the inner wall of a second through hole 42; wherein, the central axis of the connector 50 is perpendicular to the direction of gravity and the extension direction of the supporting beam 20 respectively; the central axis of the first through hole 23, the central axis of the second through hole 42, and the central axis of the connector 50 are collinear.

[0061] This configuration ensures the connection strength between the air guiding structure 40 and the first end 21, while also allowing multiple connectors 50 to reliably support the load-bearing beam 20 and reduce the deformation of the load-bearing beam 20 in the direction of gravity, thereby maximizing the connection strength.

[0062] As shown in Figures 4, 5, 6 and 7, the air guiding structure 40 is a hollow beam structure. The interior of the hollow beam structure has multiple spaced hollow spaces 43. The multiple hollow spaces 43 are independently arranged or at least a portion of the multiple hollow spaces 43 are connected. Among them, under the condition that at least a portion of the multiple hollow spaces 43 are connected, the hollow space 43 closest to the flow channel 41 is connected to the flow channel 41.

[0063] By setting the air guiding structure 40 as a hollow beam structure, the lightweight design of the air guiding structure 40 is ensured; by setting at least a portion of the multiple hollow spaces 43 to be connected, the effective flow area between the flow channel 41 and the receiving cavity 11 is increased, and the connectivity with the outside of the battery box is improved.

[0064] As shown in Figures 4, 5, 6 and 7, the air guiding structure 40 also has at least one auxiliary flow hole 44, the two ends of which are connected to the flow channel 41 and the receiving cavity 11 respectively; wherein, the orientation of the opening of the flow channel 41 connecting the receiving cavity 11 is the first direction X, the axial direction of the auxiliary flow hole 44 is the second direction Y, and the first direction X and the second direction Y have an angle.

[0065] By setting the auxiliary flow hole 44, the effective flow area between the flow channel 41 and the receiving cavity 11 is increased; by setting the first direction X and the second direction Y to have an angle, the fluid in the receiving cavity 11 can flow into the flow channel 41 from multiple angles, thereby allowing the high temperature and high pressure gas and molten material generated in the receiving cavity 11 to be discharged smoothly.

[0066] In some embodiments of this application, the angle between the first direction X and the second direction Y is a right angle, so as to facilitate the precise positioning and processing of the auxiliary flow hole 44.

[0067] As shown in Figures 1, 2 and 5, the battery box also includes a first fastener 60. One end of the first fastener 60 passes through the explosion-proof pressure regulating valve 30 and is connected to the box structure 10. The first fastener 60 is configured to fix the explosion-proof pressure regulating valve 30 to the outside of the box structure 10.

[0068] By setting the first fastener 60, the explosion-proof pressure regulating valve 30 is firmly fixed to the outside of the housing structure 10.

[0069] In some embodiments of this application, as shown in FIG5, the battery box further includes a sealing rivet nut, which is disposed in the receiving cavity 11; the first fastener 60 is a fastening screw, and a sealing rivet nut is threadedly engaged with a fastening screw to fix the fastening screw; wherein, the sealing rivet nut is projected along the extension direction of the bearing beam 20 onto the first mating surface 12 to form a fifth projection, and the fifth projection is located within the first projection.

[0070] Optionally, the battery box also includes a second fastener, one end of which passes through the explosion-proof pressure regulating valve 30 and the first mating surface 12 in sequence, and is connected to the first end 21 of the supporting beam 20. The second fastener is configured to fix the explosion-proof pressure regulating valve 30 and the first end 21 on the box structure 10. The second fastener is projected onto the first mating surface 12 along the extension direction of the supporting beam 20 to form a third projection, which is located within the first projection.

[0071] By setting the second fastener, both the explosion-proof pressure regulator 30 is firmly fixed and the first end 21 is reliably fixed on the housing structure 10 is achieved; by setting the third projection to be located within the first projection, the second fastener does not directly contact the battery cell 110, thus avoiding contact with the battery cell 110.

[0072] In some embodiments of this application, the second fastener is a connecting screw, the threaded end of which passes through the explosion-proof pressure regulating valve 30 and the first mating surface 12 in sequence, and is threadedly engaged with the first end 21 of the bearing beam 20.

[0073] Optionally, the battery box also includes a third fastener, the first end of which is connected to the first mating surface 12, and the second end of which is connected to the first end 21 of the supporting beam 20. The third fastener is configured to fix the first end 21 in the receiving cavity 11. The third fastener is projected onto the first mating surface 12 along the extension direction of the supporting beam 20 to form a fourth projection, which is located within the first projection.

[0074] By setting a third fastener, reliable fixation of the first end 21 on the housing structure 10 is achieved, and the third fastener does not directly contact the battery cell 110, thus avoiding contact with the battery cell 110.

[0075] In some embodiments, one or more of the first fastener 60, the second fastener, and the third fastener may be selected based on a comprehensive consideration of factors such as the actual requirements for fixing the explosion-proof pressure regulator 30, the strength requirements for fixing the first end 21 on the housing structure 10, and the space limitations within the accommodating cavity 11.

[0076] As shown in Figures 1, 2, 5 and 6, the battery box also includes a sealing ring 70, and the explosion-proof pressure regulating valve 30 has a sealing mounting groove 31. At least a portion of the sealing ring 70 is disposed in the sealing mounting groove 31 and is limited and matched with the inner wall of the sealing mounting groove 31. The sealing ring 70 and the side of the explosion-proof pressure regulating valve 30 with the sealing mounting groove 31 respectively abut against the outside of the box structure 10, and together seal the vent hole 13.

[0077] By setting the sealing ring 70 to cooperate with the inner wall of the sealing mounting groove 31, a reliable seal is achieved for the vent hole 13.

[0078] As shown in Figures 1, 8 and 9, the battery box also includes at least one support slot 80 and at least one anti-expansion beam 90; the support slot 80 is fixed on the inner wall of the receiving cavity 11 and connected to one end of an anti-expansion beam 90 to support the anti-expansion beam 90; the anti-expansion beam 90 has a second contact surface 91 that abuts against the battery cell 110, and the second contact surface 91 is a plane.

[0079] By setting the bearing slot 80, the anti-expansion beam 90 is reliably fixed; by setting the second contact surface 91 as a plane, the battery cell 110 is reliably constrained, and the anti-expansion beam 90 is more likely to bear the expansion force of the battery cell evenly.

[0080] As shown in Figures 8 and 9, the bearing slot 80 includes a slot base 81 and a slot flange 82 disposed on the slot base 81. The slot base 81 is connected to one end of an anti-expansion beam 90. The slot flange 82 is fixed to the inner wall of the receiving cavity 11 by welding. The slot base 81 is detachably connected to one end of the anti-expansion beam 90 by threaded connection or riveting.

[0081] By setting the card slot folded edge 82, it is not only convenient for the card slot 80 to be fixed to the inner wall of the receiving cavity 11 by welding, but also ensures that the connection strength after welding meets the actual use requirements.

[0082] As shown in FIG. 1, there are multiple anti-expansion beams 90, including a first beam 92 and a second beam 93. The extending direction of the first beam 92 is parallel to that of the second beam 93 and perpendicular to the extending direction of the bearing beam 20. The first beam 92 is connected to the second end 22 of the bearing beam 20 away from the first end 21 to support the second end 22.

[0083] With this arrangement, the first beam 92, the second beam 93 and the bearing beam 20 jointly form a "dry" shaped structure, thus ensuring reliable positioning and support for the battery cell 110.

[0084] In some embodiments of the present application, as shown in FIG. 1, the bearing beam 20 passes through the second beam 93 to ensure the integrity of the bearing beam 20.

[0085] As shown in FIGS. 1 and 10, the battery box further includes a cross connection structure 100. The cross connection structure 100 is arranged at the intersection of the bearing beam 20 and the second beam 93 and is respectively connected to the parts of the second beam 93 on both sides of the intersection position and the parts of the bearing beam 20 on both sides of the intersection position, so that the second beam 93 bears the bearing beam 20. Among them, the cross connection structure 100 is arranged to avoid the second fitting surface 91.

[0086] By providing the cross connection structure 100, the smoothness and integrity of the force conduction between the second beam 93 and the bearing beam 20 are ensured. By arranging the cross connection structure 100 to avoid the second fitting surface 91, the second fitting surface 91 is made flat and smooth, thus facilitating subsequent close fitting with the battery cell 110.

[0087] Optionally, the material information of the battery box includes at least one of the following: the part of the box body structure 10 with the first fitting surface 12 is made of steel material or aluminum alloy material, and the other parts are made of steel material; the bearing beam 20 is made of aluminum alloy material; or, the battery box further includes at least one anti-expansion beam 90. The anti-expansion beam 90 has a second fitting surface 91 that abuts and cooperates with the battery cell 110, and the anti-expansion beam 90 is made of aluminum alloy material.

[0088] By setting the mixed use of steel material and aluminum material, compared with the battery box made of all-aluminum material, the cost is reduced, and a balance is achieved among the requirements of overall strength, stiffness and weight.

[0089] As shown in FIGS. 1, FIG. 8 and FIG. 13, the box body structure 10 includes a box body frame 14 and a rear beam 15. The rear beam 15 is fixedly arranged on the box body frame 14. The space surrounded by the box body frame 14 and the rear beam 15 jointly forms an accommodation cavity 11. The first fitting surface 12 is located on the rear beam 15. The explosion-proof pressure stabilizing valve 30 is arranged on the side of the rear beam 15 facing away from the accommodation cavity 11. The rear beam 15 and the box body frame 14 are made of at least one of roll-pressed steel or stamped steel.

[0090] This design simplifies the structure of the housing 10, making subsequent processing easier, and effectively reduces production costs.

[0091] The rear beam 15 in this application must not only resist the expansion force generated during the expansion of the battery cell 110, but also ensure a reliable sealing interface for the bottom plate of the battery pack (i.e., the bottom plate below the battery pack) and the cover (i.e. the cover plate above the battery pack) throughout the entire life cycle. Therefore, the strength of the rear beam 15 needs to be strong enough to ensure small displacement and that the sealing surface is not affected by the force when resisting the expansion force.

[0092] As shown in Figures 5 and 13, the rear beam 15 is bent to form a protective space 151 located outside the receiving cavity 11. The explosion-proof pressure regulating valve 30 is set in the protective space 151 to avoid external impacts acting directly on the explosion-proof pressure regulating valve 30. By setting the protective space 151, the explosion-proof pressure regulating valve 30 is protected.

[0093] In some embodiments of this application, lower-cost materials, structural designs, and processing techniques can be used to process other parts of the battery box (e.g., structures other than the box frame 14, rear beam 15, and anti-expansion beam 90) to reduce costs while meeting strength and stiffness requirements. Some possible technical solutions are as follows: 1. Use high-strength plastics or polymer-based composite materials. These materials have low density, good stiffness and strength, and also good corrosion resistance and processing performance. Commonly used high-strength plastics include polycarbonate (PC) and polyetheretherketone (PEEK), while commonly used polymer-based composite materials include carbon fiber reinforced plastics. 1. **Optimization of Material Utilization:** This includes optimizing the design of the battery pack housing, such as by using materials like plastics (CFRP), etc. 2. **Structural Design Optimization:** Optimizing the structural design can improve material utilization and reduce costs. For example, using honeycomb, mesh, or laminated structures can increase rigidity and strength while reducing material usage. 3. **Manufacturing Process Optimization:** Using lower-cost manufacturing processes, such as injection molding, compression molding, or thermoforming, can reduce production costs while maintaining high production efficiency. 4. **Connection Process Optimization:** Utilizing lower-cost connection technologies, such as bonding, riveting, or welding, can reduce connection costs while ensuring the strength and rigidity of the housing. 5. **Combination with Other Materials:** Combining high-strength plastics or polymer-based composites with other low-cost materials (such as glass fiber reinforced plastics, carbon fiber reinforced thermoplastics, etc.) can improve the performance of the battery pack housing and reduce costs. Through these measures, costs can be reduced while meeting the strength and rigidity requirements of the battery pack housing.

[0094] As shown in Figures 10, 11 and 12, this application also provides a battery pack, which includes the battery box in any embodiment. The battery pack also includes a plurality of battery cells 110, which are arranged in rows and columns in the receiving cavity 11 and are limited and matched with the inner wall of the receiving cavity 11; wherein, a portion of the battery cells 110 abut against the first contact surface 12.

[0095] The battery pack proposed in this application has high safety. The high-temperature and high-pressure gas and molten material generated in the containment cavity 11 can be smoothly discharged, and external gas can also smoothly enter the containment cavity 11 to balance the gas pressure.

[0096] As shown in Figures 10, 11 and 12, the first bonding surface 12 is perpendicular to the row arrangement direction of the plurality of battery cells 110, and the extension direction of the supporting beam 20 is parallel to the row arrangement direction of the plurality of battery cells 110; or, the first bonding surface 12 is perpendicular to the column arrangement direction of the plurality of battery cells 110, and the extension direction of the supporting beam 20 is parallel to the column arrangement direction of the plurality of battery cells 110.

[0097] This design ensures reliable bearing of the cell expansion force.

[0098] This application also provides an electrical device, which includes the battery pack in any embodiment.

[0099] As shown in Figures 10, 11, 12, and 14, the electrical equipment 200 also includes a mobile frame 220, and the battery box also includes a mounting beam 120. The mounting beam 120 is disposed outside the box structure 10 and fixedly connected to the box structure 10. The mounting beam 120 is detachably connected to the mobile frame 220 to fix the battery pack 210 onto the mobile frame 220. The mobile frame 220 has a front end 221 and a rear end 222, and the battery cells 110 have mutually perpendicular... The length, height, and width directions of the battery cell 110 are as follows: the height direction of the battery cell 110 is parallel to the direction of gravity; the width direction of the battery cell 110 is parallel to the row arrangement direction of the multiple battery cells 110; and the length direction of the battery cell 110 is parallel to the column arrangement direction of the multiple battery cells 110. The number of rows of the multiple battery cells 110 is greater than the number of columns, and the row arrangement direction of the multiple battery cells 110 points from the front 221 of the vehicle to the rear 222 of the vehicle. The first bonding surface 12 is located at the rear 222 of the vehicle.

[0100] By arranging multiple battery cells 110 in a row greater than the column, and with the row arrangement of the multiple battery cells 110 pointing from the front to the rear of the vehicle, the extension direction of the load-bearing beam 20 is parallel to the main direction of the battery cell expansion force, and the first contact surface 12 is perpendicular to the main direction of the battery cell expansion force, ensuring the reliable load-bearing capacity of the battery box as a whole for the battery cell expansion force. By setting the first contact surface 12 at the rear of the vehicle, the explosion-proof pressure regulating valve 30 is also located in a relatively safe position at the rear of the vehicle, avoiding a collision between the explosion-proof pressure regulating valve 30 and the front of the vehicle, thus ensuring safety.

[0101] This application also provides a battery box processing method, which is used to process the battery box in any embodiment; the battery box processing method includes the following steps: steel structure processing step: the box structure 10 is processed using steel material, integrally formed and then subjected to electrophoretic treatment to form a protective layer; aluminum structure processing step: the load-bearing beam 20 is processed using aluminum alloy material; assembly step: after the steel structure processing step and the aluminum structure processing step are completed, the obtained structures are assembled and / or welded so that the box structure 10 is formed and the load-bearing beam 20 is fixedly set in the receiving cavity 11.

[0102] In some embodiments, after completing the steel structure processing steps and the aluminum structure processing steps, the box structure 10 is formed according to actual needs by assembly, welding, or a combination of both, while the load-bearing beam 20 is stably placed in the receiving cavity 11.

[0103] By setting the electrophoretic treatment to be applied only to structures made of steel, costs can be effectively reduced.

[0104] For example, the battery box further includes at least two support slots 80 and at least one anti-expansion beam 90; the anti-expansion beam 90 has a second mating surface 91 that abuts against the battery cell 110; the steel structure processing step includes: processing the support slots 80 using steel material; the aluminum structure processing step includes: processing the anti-expansion beam 90 using aluminum alloy material; the assembly step includes: fixing at least two support slots 80 to the receiving cavity 11 by welding, and then assembling and fixing both ends of the anti-expansion beam 90 to one support slot 80 respectively, so that the anti-expansion beam 90 is fixed in the receiving cavity 11.

[0105] By using steel to process the bearing slot 80, the bearing slot 80 is made of the same material as the box structure 10, which can ensure the welding quality during subsequent welding and fixing. In this application, steel and aluminum materials are mixed and direct welding and fixing between aluminum and steel materials are avoided, thus ensuring overall consistency and avoiding welding defects caused by welding between different materials.

[0106] In some embodiments of this application, the process of forming the battery pack using roll forming and stamping typically includes the following steps: 1. Material selection: Selecting suitable steel for the battery pack body, usually high-strength, corrosion-resistant steel plates, such as galvanized steel plates, stainless steel plates, etc.; 2. Design drawings: Designing corresponding processing drawings and molds according to the size, shape, and performance requirements of the battery pack body; 3. Cutting: Cutting the steel plate into the required size and shape according to the design drawings. Cutting methods include laser cutting, plasma cutting, flame cutting, etc.; 4. Roll forming: Roll forming the cut steel plate to shape it into the preliminary shape of the battery pack body. During the roll forming process, the steel plate gradually deforms under the pressure of a series of rollers to form the required shape; 5. Stamping: Stamping the roll-formed steel plate to form the complex structure and details of the battery pack body. During the stamping process, the steel plate is guided by the mold and pressed... 6. Welding: The stamped components are welded together to form a complete battery box. Welding methods include laser welding, argon arc welding, and electric arc welding. The appropriate welding method is selected according to the material and structural requirements. 7. Surface treatment: The welded battery box is surface treated to improve its corrosion resistance and aesthetics. Surface treatment methods include sandblasting, phosphating, electrophoretic coating, and powder coating. 8. Quality inspection: The processed battery box is inspected to ensure that its size, shape, and performance meet the design requirements. 9. Assembly: The processed battery box is assembled with other battery components to form a complete battery pack. Through the above steps, the battery pack, processed from steel using roll forming and stamping processes, has high strength, good corrosion resistance, and structural stability, which can meet the protection and support requirements of electric vehicle battery packs.

[0107] This application also provides a battery box processing method, which is used to process the battery box in any embodiment; the box structure 10 includes a box frame 14 and a rear beam 15, the rear beam 15 is fixedly disposed on the box frame 14, and the space surrounded by the two together forms a receiving cavity 11; a first mating surface 12 is located on the rear beam 15; the battery box also includes at least one anti-expansion beam 90; the anti-expansion beam 90 has a second mating surface 91 that abuts against the battery cell 110; the battery box processing method includes the following steps: steel structure processing step: the box frame 14 is processed using steel material, and after processing and forming, it is subjected to electrophoretic treatment to form a protective layer; aluminum structure processing step: the rear beam 15, the load-bearing beam 20 and the anti-expansion beam 90 are processed using aluminum alloy material respectively; assembly step: after the steel structure processing step and the aluminum structure processing step are completed, the obtained structures are assembled and / or welded so that the box structure 10 is formed and the load-bearing beam 20 and the anti-expansion beam 90 are respectively fixedly disposed in the receiving cavity 11.

[0108] By using aluminum alloy for the rear beam 15, load-bearing beam 20, and expansion-resistant beam 90, the optimal materials for the main load-bearing structures are achieved. The use of aluminum for the rear beam 15, load-bearing beam 20, and expansion-resistant beam 90, as the main load-bearing structures, ensures sufficient strength and rigidity while achieving lightweight design.

[0109] In some embodiments of this application, the box frame 14 is formed by rolling and stamping steel. After the box frame 14 is assembled, it undergoes electrophoretic treatment. As shown in Figures 1 and 8, the box frame 14 includes a front beam 16 and a side beam 17. The front beam 16, rear beam 15, and mounting beam 120 are all formed by stamping steel sheet metal, while the side beam 17 is formed by rolling steel. The side beam 17 has a welded fixed bearing groove 80 to meet the assembly requirements of the aluminum beam. This application proposes to develop and design a hybrid scheme of rolled steel and aluminum profiles. The resulting battery box not only reduces costs but also meets weight requirements. In actual processing, high-strength steel plates (e.g., 780DP) with a thickness range of 1.0~2.0 mm can be selected. The box frame 14 is made using a roll forming process, and the box frame 14 and the rear beam 15 are integrated using a roll forming + stamping process. The anti-expansion beam 90 is made of aluminum profile. After electrophoresis, the box frame 14 is assembled to form the battery box, and then the battery cells 110, electrical components and other parts are installed to form a complete battery pack.

[0110] In other embodiments of this application, the high-strength steel plate may be made of the following materials: 1. High-strength low-alloy (HSLA) steel, which improves its strength and toughness by adding small amounts of alloying elements (such as manganese, silicon, molybdenum, niobium, vanadium, etc.); HSLA steel has good weldability and processing performance, and is suitable for manufacturing complex battery box structures; 2. Stainless steel, which contains a high chromium content and has good corrosion resistance, making it suitable for use in harsh environments; common types of stainless steel include 304 and 316, and their application in battery boxes can improve the durability of the product; 3. Duplex stainless steel, which combines the advantages of austenitic and ferritic stainless steel, has higher strength and corrosion resistance, and is suitable for manufacturing battery box components that bear large loads; 4. Martensitic stainless steel, which can significantly improve its hardness and strength through heat treatment, and is suitable for manufacturing battery box components that require high hardness and wear resistance; 5. Ultra-high-strength steel, which has extremely high tensile strength. 1. **Strength and Toughness:** This type of steel can withstand extremely high loads and is often used in the manufacture of key components for high-performance products such as aircraft and automobiles. It is also suitable for the manufacture of battery boxes. 2. **Alloy Steel:** Alloy steel can have its properties adjusted by adding different alloying elements to meet the needs of specific applications. For example, adding elements such as nickel, chromium, and molybdenum can improve the strength, toughness, and corrosion resistance of the steel. 3. **Hot-Rolled Steel Plate:** Hot-rolled steel plates are rolled at high temperatures and have good strength and toughness. They are commonly used to manufacture the outer shell of battery boxes and other structural components. 4. **Cold-Rolled Steel Plate:** Cold-rolled steel plates are rolled at room temperature and have high dimensional accuracy and surface finish, making them suitable for manufacturing precision components for battery boxes. When selecting high-strength steel plate materials, it is necessary to consider factors such as the application scenario of the battery box, mechanical performance requirements, processing technology, and cost. Additionally, environmental factors such as the material's weldability, corrosion resistance, and recyclability must also be considered.

[0111] This application provides a battery box, battery pack, electrical equipment, and a battery box processing method. By setting at least a portion of the vent 13 within the first projection and communicating with the space between the first end 21 and the first mating surface 12, at least a portion of the vent 13 is not blocked by the battery cell 110 attached to the first mating surface 12. This ensures reliable communication between the vent 13 and the receiving cavity 11, improves the permeability of the first mating surface 12, and further improves the communication between the explosion-proof pressure regulating valve 30 and the outside of the battery box. This allows high-temperature, high-pressure gas and molten material generated within the receiving cavity 11 to be smoothly discharged, and external gas to smoothly enter the receiving cavity 11 to balance the pressure. In situations where the explosion-proof pressure relief valve needs to be opened, this avoids jamming or blockage, providing structural support for improving the safety of the battery pack. This application creatively designs the relative positional relationship between the vent 13 and the supporting beam 20, resulting in a simple structure and reliable venting. This facilitates the installation of the explosion-proof pressure relief valve and ensures the rationality of fluid flow within the receiving cavity 11. By using steel instead of aluminum, the material cost of this application is reduced, thus lowering the overall material cost of the battery box. Simultaneously, compared to a pure steel box, the electrophoresis area is reduced, further lowering costs. This application achieves the connection between multiple internal aluminum beams and the steel frame through the installation of a bearing slot 80; and by providing vent holes 13 and a venting structure 40, it satisfies the installation and reliable pressure relief of the explosion-proof pressure regulating valve 30.

[0112] In some embodiments, the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0113] Unless otherwise stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any numerical values ​​should be interpreted as exemplary. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be discussed in subsequent drawings.

[0114] In the description of this application, directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0115] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0116] Furthermore, the use of terms such as "first" and "second" to specify components is for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning.

Claims

1. A battery box, comprising: a box structure (10) having an accommodating cavity (11) inside for accommodating a battery cell (110); the accommodating cavity (11) has a first fitting surface (12) abutting with the battery cell (110), and the first fitting surface (12) has a gas vent hole (13); a load-bearing beam (20) fixedly arranged in the accommodating cavity (11) and arranged to support the box structure (10); the load-bearing beam (20) has a first end (21) along its extension direction, and the first end (21) faces the first fitting surface (12); an explosion-proof pressure stabilizing valve (30) arranged outside the accommodating cavity (11) and in communication with the gas vent hole (13); wherein the first end (21) is projected to the first fitting surface (12) along the extension direction of the load-bearing beam (20) to form a first projection, and at least a part of the gas vent hole (13) is located in the first projection and in communication with the accommodating cavity (11).

2. The battery case according to claim 1, wherein The first end (21) is arranged in a spaced manner with the first fitting surface (12) to make the gas vent hole (13) in communication with the space between the first end (21) and the first fitting surface (12); or the load-bearing beam (20) has a gas vent passage, and two ends of the gas vent passage are in communication with the gas vent hole (13) and the accommodating cavity (11), respectively.

3. The battery box according to claim 2, further comprising a gas guide structure (40) passing through the gas vent hole (13), and the explosion-proof pressure stabilizing valve (30) is arranged at one end of the gas guide structure (40); the gas guide structure (40) has a flow passage (41) inside, and the flow passage (41) is in communication with the accommodating cavity (11) and the explosion-proof pressure stabilizing valve (30), respectively.

4. The battery pack of claim 3, wherein, One end of the gas guide structure (40) located in the accommodating cavity (11) is connected with the first end (21) to support the load-bearing beam (20); the gas guide structure (40) is limitedly matched with the inner wall of the gas vent hole (13); wherein the one end of the gas guide structure (40) located in the accommodating cavity (11) is projected to the first fitting surface (12) along the extension direction of the load-bearing beam (20) to form a second projection, and the second projection is coincident with or located in the first projection.

5. The battery pack of claim 4, wherein, The first end (21) of the load-bearing beam (20) has a cavity inside, and the one end of the gas guide structure (40) located in the accommodating cavity (11) extends into the cavity; the battery box further comprises a connecting piece (50) connected with the gas guide structure (40) and the load-bearing beam (20), respectively.

6. The battery pack of claim 5, wherein, The first end (21) further has a stepped first through hole (23); the air guide structure (40) has a second through hole (42), the first through hole (23) and the second through hole (42) correspondingly communicate; the first end of the connecting piece (50) passes through the first through hole (23) and is matched with the inner wall of the second through hole (42); the second end of the connecting piece (50) is located in the first through hole (23) and is matched with the stepped surface in the first through hole (23).

7. The battery pack of claim 5, wherein, The first end (21) further has a plurality of first through holes (23), the first through holes (23) communicate with the cavity; the air guide structure (40) has a plurality of second through holes (42) at one end located in the containing cavity (11), a plurality of the first through holes (23) and a plurality of the second through holes (42) correspondingly communicate; the connecting piece (50) is a plurality of, a plurality of the connecting pieces (50) and a plurality of the first through holes (23) correspondingly match; one end of one connecting piece (50) passes through one first through hole (23) and is matched with the inner wall of one second through hole (42); wherein the central axis of the connecting piece (50) is perpendicular to the direction of gravity and the extension direction of the bearing beam (20) respectively; the central axis of the first through hole (23), the central axis of the second through hole (42) and the central axis of the connecting piece (50) are collinear.

8. The battery box according to any one of claims 3 to 7, wherein The air guide structure (40) is a hollow beam structure, the inside of the hollow beam structure has a plurality of spaced hollow spaces (43), a plurality of the hollow spaces (43) are independently arranged or at least part of a plurality of the hollow spaces (43) are communicated; wherein, under the condition that at least part of a plurality of the hollow spaces (43) are communicated, the hollow space (43) closest to the flow-through channel (41) communicates with the flow-through channel (41).

9. The battery pack of claim 3, wherein, The air guide structure (40) further has at least one auxiliary flow-through hole (44), two ends of the auxiliary flow-through hole (44) respectively communicate with the flow-through channel (41) and the containing cavity (11); wherein, the direction of the opening of the flow-through channel (41) and the containing cavity (11) is a first direction, the axial direction of the auxiliary flow-through hole (44) is a second direction, the first direction and the second direction have an included angle.

10. The battery box of claim 1, further comprising a first fastener (60), one end of the first fastener (60) passes through the explosion-proof pressure stabilizing valve (30) and is connected with the box structure (10), the first fastener (60) is arranged to fix the explosion-proof pressure stabilizing valve (30) arranged outside the box structure (10).

11. The battery box according to claim 1, further comprising a second fastener, one end of the second fastener sequentially passing through the explosion-proof pressure stabilizing valve (30) and the first bonding surface (12) and being connected with the first end (21) of the load bearing beam (20), the second fastener being arranged to fix the explosion-proof pressure stabilizing valve (30) and the first end (21) on the box structure (10); wherein, The first end of the second fastener located in the containing cavity (11) projects to the first adhering surface (12) along the extension direction of the bearing beam (20), forming a third projection, the third projection is located in the first projection.

12. The battery box according to claim 1, further comprising a third fastener, a first end of the third fastener being connected with the first bonding surface (12), a second end of the third fastener being connected with the first end (21) of the load bearing beam (20), the third fastener being arranged to fix the first end (21) within the accommodating cavity (11); wherein, A fourth projection is formed by projecting the third fastener along the extension direction of the bearing beam (20) to the first bonding surface (12), and the fourth projection is located in the first projection.

13. The battery box of claim 1, further comprising a sealing ring (70), the explosion-proof pressure stabilizing valve (30) having a sealing mounting groove (31) thereon, at least a portion of the sealing ring (70) being arranged in the sealing mounting groove (31) and being limitedly fitted with an inner wall of the sealing mounting groove (31); wherein, The sealing ring (70) and the explosion-proof pressure stabilizing valve (30) have one side of the sealing installation groove (31) abutting against the outside of the box structure (10) respectively, and jointly sealing the air vent hole (13).

14. The battery box of claim 1, further comprising at least one bearing slot (80) and at least one anti-expansion beam (90); the bearing slot (80) is fixed on the inner wall of the accommodating cavity (11) and connected with one end of the anti-expansion beam (90) to bear the anti-expansion beam (90); the anti-expansion beam (90) has a second bonding surface (91) abutting against the battery cell (110).

15. The battery pack of claim 14, wherein, The bearing slot (80) comprises a slot base (81) and a slot folding edge (82) arranged on the slot base (81), the slot base (81) is connected with one end of the anti-expansion beam (90); the slot folding edge (82) is fixed on the inner wall of the accommodating cavity (11); wherein the slot base (81) is detachably connected with one end of the anti-expansion beam (90) by threaded connection or riveting.

16. The battery pack of claim 14, wherein, The anti-expansion beam (90) is a plurality of beams, comprising a first beam (92) and a second beam (93), the extension direction of the first beam (92) is parallel to the extension direction of the second beam (93), and perpendicular to the extension direction of the bearing beam (20); the first beam (92) is connected with the second end (22) of the bearing beam (20) away from the first end (21) to bear the second end (22).

17. The battery box according to claim 16, further comprising a cross connecting structure (100) provided at a position where the load bearing beam (20) and the second beam (93) cross, connected with portions of the second beam (93) on both sides of the cross position, portions of the load bearing beam (20) on both sides of the cross position, respectively, to make the second beam (93) bear the load bearing beam (20); wherein, The cross connection structure (100) is arranged to avoid the second bonding surface (91).

18. The battery pack of claim 1, wherein, The material information of the battery box comprises at least one of the following: the part of the box structure (10) having the first bonding surface (12) adopts steel material or aluminum alloy material, and other parts adopt steel material; the bearing beam (20) adopts aluminum alloy material; or, the battery box further comprises at least one anti-expansion beam (90), the anti-expansion beam (90) has a second bonding surface (91) abutting against the battery cell (110), and the anti-expansion beam (90) adopts aluminum alloy material.

19. The battery pack of claim 18, wherein, The box structure (10) comprises a box frame (14) and a rear beam (15), the rear beam (15) is fixedly arranged on the box frame (14), and the space surrounded by the box frame (14) and the rear beam (15) jointly forms the accommodating cavity (11); the first bonding surface (12) is located on the rear beam (15); the explosion-proof pressure stabilizing valve (30) is arranged on the side of the rear beam (15) away from the accommodating cavity (11); the rear beam (15) and the box frame (14) adopt at least one of rolled steel or stamped steel.

20. A battery pack comprising the battery box according to any one of claims 1 to 19, the battery pack further comprising a plurality of battery cells (110), the plurality of battery cells (110) being arranged in rows and columns within the accommodating cavity (11) and being limited by the inner wall of the accommodating cavity (11); wherein, A part of the battery cell (110) abuts against the first bonding surface (12).

21. The battery pack of claim 20, wherein, The first fitting surface (12) is perpendicular to the row arrangement direction of the plurality of battery cells (110), and the extension direction of the bearing beam (20) is parallel to the row arrangement direction of the plurality of battery cells (110). Alternatively, the first fitting surface (12) is perpendicular to the column arrangement direction of the plurality of battery cells (110), and the extension direction of the bearing beam (20) is parallel to the column arrangement direction of the plurality of battery cells (110).

22. A power consuming device comprising the battery pack of claim 20 or 21, the power consuming device further comprising a mobile vehicle frame, and the battery pack is fixed on the mobile vehicle frame.

23. The power consuming device of claim 22, the battery box further comprising a mounting beam (120) arranged outside the box structure (10) and fixedly connected with the box structure (10); the mounting beam (120) is connected with the mobile vehicle frame to fix the battery pack on the mobile vehicle frame.

24. The powered device of claim 23, wherein, The mobile vehicle frame has a front and a rear, the battery cells (110) have mutually perpendicular length direction, height direction and width direction, the height direction of the battery cells (110) is parallel to the direction of gravity, the width direction of the battery cells (110) is parallel to the row arrangement direction of the plurality of battery cells (110), and the length direction of the battery cells (110) is parallel to the column arrangement direction of the plurality of battery cells (110); wherein the number of rows of the plurality of battery cells (110) is greater than the number of columns, the row arrangement direction of the plurality of battery cells (110) points from the front to the rear, and the first fitting surface (12) is located at the rear position.

25. A battery box processing method for processing the battery box of any one of claims 1 to 19; the battery box processing method comprising: steel structure processing: the box structure (10) is processed by using steel material, and after being integrally processed and formed, electrophoresis treatment is performed to form a protective layer; aluminum structure processing: the bearing beam (20) is processed by using aluminum alloy material; assembly: after the steel structure processing and the aluminum structure processing are completed, the obtained structures are assembled and / or welded to form the box structure (10) and fixedly arrange the bearing beam (20) in the accommodating cavity (11).

26. A battery box processing method for processing the battery box of any one of claims 1 to 19; the box structure (10) comprises a box frame (14) and a rear beam (15), the rear beam (15) is fixedly arranged on the box frame (14), and the space surrounded by the rear beam (15) and the box frame (14) forms the accommodating cavity (11) together; the first fitting surface (12) is located on the rear beam (15); the battery box further comprises at least one anti-expansion beam (90); the anti-expansion beam (90) has a second fitting surface (91) abuttingly matched with the battery cell (110); the battery box processing method comprises: Steel structure processing: the box frame (14) is processed by using steel material, and after processing and forming, electrophoresis treatment is performed to form a protective layer; Aluminum structure processing: the rear beam (15), the load bearing beam (20) and the anti-expansion beam (90) are respectively processed by using aluminum alloy material; Assembly: after the steel structure processing and the aluminum structure processing are completed, the obtained structures are assembled and / or welded to make the box structure (10) formed and the load bearing beam (20) and the anti-expansion beam (90) respectively fixedly arranged in the accommodating cavity (11).

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