Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack. The battery box comprises a protection box body, a cross beam, a longitudinal beam, an upper cover body and a reinforced connection structure, a containing cavity is formed in the protection box body, and the cross beams and the longitudinal beams are fixedly arranged on the inner wall of the containing cavity. The upper cover body is arranged on the protection box body and is used for sealing the accommodating cavity; wherein the lower end of the reinforced connecting structure is connected with the cross beam and the longitudinal beam, and the upper end is connected with the upper cover body, so that the three are relatively fixed; the area of the lower end face of the reinforced connecting structure is larger than that of the upper end face. According to the battery box, the cross beam, the longitudinal beam and the upper cover body are relatively fixed, so that the upper cover body can be connected with the protection box body into a whole through the reinforcing connection structure, the overall strength of the battery box can be greatly improved, vibration of a battery pack comprising the battery box in the vehicle running process is effectively reduced, the service life of the battery pack is longer, and the battery pack is more compact. And the failure risk is lower.

Description

Technical Field

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

[0002] Existing battery boxes usually include an upper cover, a frame, a crossbeam and a longitudinal beam. The frame defines an installation compartment, and the installation compartment is provided with vertically crossed and welded crossbeams and longitudinal beams. The ends of the crossbeams and longitudinal beams are welded and fixed to the frame. The crossbeams and longitudinal beams divide the installation compartment into a module accommodating cavity for storing a battery module; the crossbeams and longitudinal beams can improve the overall strength of the battery box and reduce the vibration amplitude of the battery box during vehicle driving. The upper cover is fixed on the frame to seal the module accommodating cavity.

[0003] However, in existing battery boxes, the top cover is usually only connected to the frame, and is usually spaced apart from the cross beams and longitudinal beams, resulting in a lack of effective force transmission between the top cover and the cross beams and longitudinal beams, thereby reducing the overall strength of the battery box; and, as the overall specifications of the battery box become larger and the weight increases, the size of the cross beams and longitudinal beams will also increase accordingly, resulting in an increase in their amplitude when vibrated. The vibration of the cross beams and longitudinal beams relative to the frame and the top cover will also effectively reduce the working reliability of the battery box. Utility Model Content

[0004] The main purpose of this application is to provide a battery box and a battery pack, which connect the upper cover, cross beam and longitudinal beam into one body to improve the strength of the battery box.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a battery box is provided, including: a protective box body, a crossbeam, a longitudinal beam, an upper cover body and a reinforced connection structure; the protective box body has a accommodating cavity inside, and the crossbeam and the longitudinal beam are respectively fixed on the inner wall of the accommodating cavity; the upper cover body is arranged on the protective box body for sealing the accommodating cavity; wherein the lower end of the reinforced connection structure is connected to the crossbeam and the longitudinal beam, and the upper end is connected to the upper cover body to fix the three relatively; the area of ​​the lower end face of the reinforced connection structure is larger than the area of ​​the upper end face.

[0006] Furthermore, the battery box also includes a connecting piece; the reinforced connection structure includes a reinforced connecting block, the area of ​​the lower end face of the reinforced connecting block is larger than the area of ​​the upper end face; the reinforced connecting block is fixedly connected to the cross beam and the longitudinal beam respectively; one end of the connecting piece is connected to the upper cover body, and the other end passes through the reinforced connecting block and is connected to the cross beam or the longitudinal beam.

[0007] Furthermore, the reinforcing connecting block is arranged at the cross intersection of the cross beam and the longitudinal beam, and is fixedly connected to the cross beam and the longitudinal beam respectively by screw connection or riveting; the connecting piece passes through the middle part of the reinforcing connecting block and is threadedly connected to the cross beam or the longitudinal beam to relatively fix the upper cover body and the middle part of the reinforcing connecting block.

[0008] Furthermore, the reinforced connecting block includes a central connector and four platforms respectively fixed on the outer periphery of the central connector, the four platforms are arranged in a cross shape, two corresponding platforms are respectively connected to the cross beam, and two corresponding platforms are respectively connected to the longitudinal beam; the upper end of the central connector faces the upper cover body, and the area of ​​the lower end face of the platform is respectively larger than the area of ​​the upper end face of the platform and the area of ​​the upper end face of the central connector; the connecting piece passes through the central connector.

[0009] Furthermore, the platform includes multiple layers of steps stacked in sequence; as the number of steps increases, the area and mass of the steps gradually decrease.

[0010] Furthermore, the portion of the middle connector that is higher than the uppermost step is a boss, and a through hole is provided in the middle of the boss. One end of the connector with a thread passes through the upper cover and the through hole, and is threadedly connected to the crossbeam or longitudinal beam.

[0011] Furthermore, the battery box also includes a sealing elastic member, which is arranged between the boss and the upper cover and is respectively abutted against the boss and the upper cover to seal the gap between the boss and the upper cover.

[0012] Furthermore, the platform is a stepped or curved platform structure; the size of the platform gradually decreases from bottom to top.

[0013] Furthermore, under the condition that the platform body is a step platform, the step platform has a lower top surface, an upper top surface, an inclined surface and a vertical surface. The upper top surface is located above the lower top surface and is arranged parallel to the lower top surface. The area of ​​the upper top surface is smaller than that of the lower top surface; the inclined surface is arranged obliquely, and its two ends are respectively connected to the upper top surface and the lower top surface; the vertical surface is arranged vertically, and its two ends are respectively connected to the upper top surface and the lower top surface; the shape of the vertical surface is adapted to the outer peripheral shape of the middle connector, and is fixedly connected to the middle connector; the lower top surface abuts against the horizontal beam or the longitudinal beam, and the extension direction of the lower top surface is the same as that of the lower top surface. The extension direction of the horizontal beam or the longitudinal beam is parallel; when the platform body is a curved platform, the step platform has a lower curved surface, an upper curved surface, an inclined curved surface and a vertical curved surface, the upper curved surface is located above the lower curved surface, and is arranged in parallel with the lower curved surface, and the area of ​​the upper arc is smaller than the area of ​​the lower arc; the inclined curved surface is arranged at an angle, and its two ends are respectively connected to the upper curved surface and the lower curved surface; the vertical curved surface is arranged vertically, and its two ends are respectively connected to the upper curved surface and the lower curved surface; the shape of the vertical curved surface is adapted to the outer peripheral shape of the middle connector, and is fixedly connected to the middle connector; the lower curved surface abuts against the horizontal beam or the longitudinal beam.

[0014] Furthermore, the cross beams, longitudinal beams and the reinforcing connection structure are projected onto the same horizontal plane along the vertical direction, the projections of the cross beams and the longitudinal beams form a total projection, and at least a portion of the reinforcing connection structure is located within the total projection.

[0015] Furthermore, the battery box also includes a sealing elastic member, which is arranged between the reinforcing connection structure and the upper cover body, and respectively abuts against the reinforcing connection structure and the upper cover body to seal at least a portion of the gap between the reinforcing connection structure and the upper cover body.

[0016] Furthermore, the middle portion and / or the upper portion of the reinforced connection structure has a hollow space, so that the mass of the middle portion and / or the upper portion is smaller than that of the lower portion.

[0017] Furthermore, the cross beam and the longitudinal beam are fixedly arranged at the cross intersection of the cross beam and the longitudinal beam. At the cross intersection of the cross beam and the longitudinal beam, the cross beam has a first matching groove and the longitudinal beam has a second matching groove. The inner wall of the first matching groove is limitedly matched with the inner wall of the second matching groove; wherein, the ratio of the dimension of the first matching groove in the vertical direction to the dimension of the cross beam in the vertical direction is A, A≤0.5, and the ratio of the dimension of the second matching groove in the vertical direction to the dimension of the longitudinal beam in the vertical direction is B, B≤0.5.

[0018] Furthermore, arc welding is used to fix the cross beam and the longitudinal beam at their intersections, and the weld is provided at the edge of the first matching groove and / or the second matching groove.

[0019] The present application also provides a battery pack, which includes the above-mentioned battery box and a plurality of battery cells, and the plurality of battery cells are arranged in the accommodating cavity of the protective box.

[0020] In this scheme, the present application provides a battery box, comprising: a protective box body, a crossbeam, a longitudinal beam, an upper cover body and a reinforced connection structure; the protective box body has a accommodating cavity inside, and the crossbeam and the longitudinal beam are respectively fixed on the inner wall of the accommodating cavity; the upper cover body is arranged on the protective box body for sealing the accommodating cavity; wherein, the lower end of the reinforced connection structure is connected to the crossbeam and the longitudinal beam, and the upper end is connected to the upper cover body to fix the three relatively; the area of ​​the lower end face of the reinforced connection structure is larger than the area of ​​the upper end face.

[0021] The present application sets up a reinforced connection structure to connect the crossbeam, longitudinal beam and upper cover respectively, so that the crossbeam, longitudinal beam and upper cover are relatively fixed, so that the upper cover can be connected to the protective box body as a whole through the reinforced connection structure, so that there is an effective force transmission method between the upper cover body and the crossbeam and longitudinal beam, which can greatly improve the overall strength of the battery box, effectively reduce the vibration of the battery pack containing the battery box during the driving of the vehicle, and thus make the battery pack longer and the risk of failure lower; the present application effectively connects the crossbeam and longitudinal beam by setting up a reinforced connection structure, optimizes the mechanical properties of the connection between the crossbeam and the longitudinal beam, and improves the structural design of the battery box. The design effectively improves the working reliability of the battery box; by setting the area of ​​the lower end face of the reinforced connection structure to be larger than the area of ​​the upper end face, the mass of the lower part of the reinforced connection structure is greater than the mass of the upper part, and the center of mass of the reinforced connection structure is located at the lower part of the reinforced connection structure. This arrangement makes the main mass of the reinforced connection structure concentrated at the connection end with the crossbeam or longitudinal beam, which can better transmit and resist the lateral force or longitudinal force transmitted from the crossbeam or longitudinal beam, and thus, while the reinforced connection structure has sufficient stability and durability, the overall mass of the reinforced connection structure is also smaller, which is convenient for installation and processing, and effectively reduces material cost and processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0023] Figure 1 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application with the upper cover removed is shown;

[0024] Figure 2 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application is shown from a top view;

[0025] Figure 3 Shown Figure 2 Partial structural cross-sectional view from the main viewing angle;

[0026] Figure 4 Shown Figure 3 A partial enlarged schematic diagram of point A in the middle;

[0027] Figure 5 A schematic diagram of the external structure of a reinforced connection block provided in an embodiment of the present application is shown;

[0028] Figure 6 A schematic diagram of the external structure of a beam provided in an embodiment of the present application is shown;

[0029] Figure 7A schematic diagram of the external structure of a longitudinal beam provided in an embodiment of the present application is shown.

[0030] The above drawings include the following reference numerals:

[0031] 10. Protective box; 11. Accommodation cavity;

[0032] 20. crossbeam; 21. first matching groove;

[0033] 30. longitudinal beam; 31. second matching groove;

[0034] 40. Upper cover;

[0035] 50. Reinforced connection structure; 51. Connector; 52. Reinforced connection block; 521. Middle connector; 522. Platform; 523. Step; 524. Boss; 525. Through hole;

[0036] 60. Sealing elastic parts. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] like Figures 1 to 7 As shown, the present application provides a battery box, comprising: a protective box body 10, a crossbeam 20, a longitudinal beam 30, an upper cover body 40 and a reinforcing connection structure 50; the protective box body 10 has a accommodating cavity 11 inside, and the crossbeam 20 and the longitudinal beam 30 are respectively fixed on the inner wall of the accommodating cavity 11; the upper cover body 40 is arranged on the protective box body 10, for sealing the accommodating cavity 11; wherein, the lower end of the reinforcing connection structure 50 is connected to the crossbeam 20 and the longitudinal beam 30, and the upper end is connected to the upper cover body 40, so as to fix the three relatively; the area of ​​the lower end face of the reinforcing connection structure 50 is larger than the area of ​​the upper end face.

[0039] In this solution, a reinforcing connection structure 50 is provided to connect the crossbeam 20, the longitudinal beam 30 and the upper cover 40 respectively, so that the crossbeam 20, the longitudinal beam 30 and the upper cover 40 are relatively fixed, so that the upper cover 40 can be connected to the protective box 10 as a whole through the reinforcing connection structure 50, so that there is an effective force transmission method between the upper cover 40 and the crossbeam 20 and the longitudinal beam 30, which can greatly improve the overall strength of the battery box, effectively reduce the vibration of the battery pack including the battery box during the driving process of the vehicle, thereby making the battery pack have a longer life and a lower risk of failure; the present application effectively connects the crossbeam 20 and the longitudinal beam 30 by providing a reinforcing connection structure 50, optimizes the mechanical properties of the connection between the crossbeam 20 and the longitudinal beam 30, and improves The structural design of the battery box is improved, and the working reliability of the battery box is effectively improved; by setting the area of ​​the lower end face of the reinforced connection structure 50 to be larger than the area of ​​the upper end face, the mass of the lower part of the reinforced connection structure 50 is greater than the mass of the upper part, and the center of mass of the reinforced connection structure 50 is located at the lower part of the reinforced connection structure 50. This setting makes the main mass of the reinforced connection structure 50 concentrated at the connection end with the crossbeam 20 or the longitudinal beam 30, which can better transmit and resist the lateral force or longitudinal force transmitted from the crossbeam 20 or the longitudinal beam 30, and thus, while the reinforced connection structure 50 has sufficient stability and durability, the overall mass of the reinforced connection structure 50 is also smaller, which is convenient for installation and processing, and effectively reduces material cost and processing cost.

[0040] It is worth noting that by setting the specific structure and connection relationship of the reinforced connection structure 50, the following advantages are also achieved: 1. Improving structural stability; the reinforced connection structure 50 can improve the overall stiffness and stability of the battery box, reduce structural deformation caused by vibration or impact during driving, and thus protect the battery cells from damage; 2. Enhancing the durability of the battery box; by strengthening the connection structure 50, the durability of the battery box can be improved, so that it can reduce the wear and damage caused by vibration between internal structures during long-term use, and extend the service life of the battery box; 3. Improving safety performance; the reinforced connection structure 50 can improve the impact resistance of the battery box, reduce the risk of damage to the battery cells in extreme situations such as collisions, and improve the safety performance of the battery box; 4. Facilitating heat dissipation; the reinforced connection structure 50 can use metal materials for heat conduction and be designed into a structure that is conducive to heat dissipation, so that the heat on the crossbeam 20 and / or longitudinal beam 30 can be transferred to the upper cover body 40 by heat conduction, thereby contributing to the heat dissipation of the accommodating cavity 11, reducing the operating temperature of the battery cells, and improving the performance and life of the battery.

[0041] like Figure 1 and Figure 4As shown, the battery box also includes a connector 51; the reinforced connection structure 50 includes a reinforced connection block 52, and the area of ​​the lower end surface of the reinforced connection block 52 is larger than the area of ​​the upper end surface; the reinforced connection block 52 is fixedly connected to the crossbeam 20 and the longitudinal beam 30 respectively; one end of the connector 51 is connected to the upper cover 40, and the other end passes through the reinforced connection block 52 to be connected to the crossbeam 20 or the longitudinal beam 30.

[0042] This arrangement not only ensures the working reliability of the reinforced connection structure 50, but also simplifies the structure of the reinforced connection structure 50, thereby facilitating subsequent disassembly and assembly.

[0043] like Figure 1 As shown, the reinforcing connecting block 52 is arranged at the cross intersection of the cross beam 20 and the longitudinal beam 30, and is fixedly connected to the cross beam 20 and the longitudinal beam 30 respectively by screw connection or riveting; the connecting piece 51 passes through the middle part of the reinforcing connecting block 52 and is threadedly connected to the cross beam 20 or the longitudinal beam 30 to relatively fix the upper cover body 40 and the middle part of the reinforcing connecting block 52.

[0044] By setting the reinforcing connecting block 52 at the cross intersection of the cross beam 20 and the longitudinal beam 30, it is ensured that the reinforcing connecting block 52 can connect the cross beam 20 and the longitudinal beam 30 with a smaller size; by setting the connecting piece 51 to relatively fix the middle part of the upper cover body 40 and the reinforcing connecting block 52, it is ensured that the overall center of gravity of the reinforcing connecting structure 50 is located at the cross intersection of the cross beam 20 and the longitudinal beam 30, thereby further improving the working stability.

[0045] like Figure 1 and Figure 5 As shown, in a specific embodiment of the present application, the reinforcing connecting block 52 is arranged at the cross intersection of the cross beam 20 and the longitudinal beam 30, and each end is fixedly connected to the cross beam 20 and the longitudinal beam 30 by riveting with at least two rivets.

[0046] like Figure 1 、 Figure 4 and Figure 5 As shown, the reinforced connecting block 52 includes a central connecting body 521 and four platforms 522 respectively fixed on the outer periphery of the central connecting body 521. The four platforms 522 are arranged in a cross shape, two corresponding platforms 522 are respectively connected to the cross beam 20, and two corresponding platforms 522 are respectively connected to the longitudinal beam 30; the upper end of the central connecting body 521 faces the upper cover body 40, and the area of ​​the lower end face of the platform 522 is respectively larger than the area of ​​the upper end face of the platform 522 and the area of ​​the upper end face of the central connecting body 521; the connecting piece 51 passes through the central connecting body 521.

[0047] By providing the reinforcement connection block 52 including the middle connection body 521 and the four platforms 522 , it is ensured that the reinforcement connection block 52 has sufficient strength and rigidity, and the structure of the reinforcement connection block 52 is simplified, thereby facilitating subsequent processing and forming.

[0048] like Figure 5 As shown, the platform 522 includes multiple layers of steps 523 stacked in sequence; as the number of layers of the steps 523 gradually increases, the area and mass of the steps 523 gradually decrease.

[0049] By providing the platform 522 with multiple layers of steps 523 stacked in sequence, a simple and easy-to-process structure is used to achieve that the mass of the lower part of the platform 522 is greater than the mass of the upper part; at the same time, the steps 523 are also convenient for subsequent riveting processing, which facilitates strengthening the connection between the lower end of the connecting block 52 and the crossbeam 20 and the longitudinal beam 30.

[0050] like Figure 4 and Figure 5 As shown, the portion of the middle connector 521 that is higher than the top step 523 is a boss 524 , and the boss 524 has a through hole 525 in the middle. The connector 51 has a threaded end that passes through the upper cover 40 and the through hole 525 , and is threadedly connected to the crossbeam 20 or the longitudinal beam 30 .

[0051] By providing the boss 524 , the through hole 525 is effectively supported, thereby facilitating the subsequent installation of the connecting member 51 .

[0052] like Figure 4 As shown, the battery box further includes a sealing elastic member 60 , which is disposed between the boss 524 and the upper cover 40 and abuts against the boss 524 and the upper cover 40 respectively to seal the gap between the boss 524 and the upper cover 40 .

[0053] By providing the sealing elastic member 60 , a reliable seal is achieved for the gap between the boss 524 and the upper cover 40 , and a certain shock absorbing effect can be effectively achieved for the upper cover 40 .

[0054] In a specific embodiment of the present application, the sealing elastic member 60 can be made of an existing sealing foam material, which can absorb sound, reduce noise and seal, and is also low in cost.

[0055] Optionally, the platform 522 is a stepped or curved platform structure; the size of the platform 522 gradually decreases from bottom to top.

[0056] By configuring the platform 522 to be a stepped or curved platform structure, the mass and size of the platform 522 can be reduced more evenly from bottom to top, thereby ensuring that the platform 522 has sufficient strength and rigidity.

[0057] Specifically, under the condition that the platform body 522 is a step platform, the step platform has a lower top surface, an upper top surface, an inclined surface and a vertical surface. The upper top surface is located above the lower top surface and is arranged parallel to the lower top surface. The area of ​​the upper top surface is smaller than that of the lower top surface; the inclined surface is arranged at an angle, and its two ends are respectively connected to the upper top surface and the lower top surface; the vertical surface is arranged vertically, and its two ends are respectively connected to the upper top surface and the lower top surface; the shape of the vertical surface is adapted to the outer peripheral shape of the middle connector 521, and is fixedly connected to the middle connector 521; the lower top surface abuts against the cross beam 20 or the longitudinal beam 30, and the extension direction of the lower top surface is consistent with the cross beam 2 0 or the extension direction of the longitudinal beam 30; under the condition that the platform body 522 is a curved platform, the step platform has a lower curved surface, an upper curved surface, an inclined curved surface and a vertical curved surface, the upper curved surface is located above the lower curved surface, and is arranged in parallel with the lower curved surface, and the area of ​​the upper arc is smaller than the area of ​​the lower arc; the inclined curved surface is arranged at an angle, and its two ends are respectively connected to the upper curved surface and the lower curved surface; the vertical curved surface is arranged vertically, and its two ends are respectively connected to the upper curved surface and the lower curved surface; the shape of the vertical curved surface is adapted to the outer peripheral shape of the middle connector 521, and is fixedly connected to the middle connector 521; the lower curved surface abuts against the cross beam 20 or the longitudinal beam 30.

[0058] This arrangement enables the platform 522 to have an impact-resistant structural feature similar to that of a dam, which not only facilitates the integral processing and forming of the platform 522 , but also enables the platform 522 to withstand greater loads and impacts.

[0059] In a specific embodiment of the present application, the reinforcing connection structure 50 may further include at least one of the following structures:

[0060] 1. Transverse and longitudinal beam reinforcement plates: A reinforcement plate is provided between the transverse beam 20 and the longitudinal beam 30 to enhance the connection strength between the transverse and longitudinal beams and improve the stability of the overall structure;

[0061] 2. Cover reinforcement ribs: The upper cover 40 is provided with reinforcement ribs to improve the rigidity and deformation resistance of the upper cover 40, ensuring that the cover is not easily deformed when subjected to pressure;

[0062] 3. Bolt connection: The reinforced connection structure 50 is fixedly connected to the cross beam 20, the longitudinal beam 30, and the upper cover 40 by bolts, which can improve the reliability and stability of the connection;

[0063] 4. Welding connection: The reinforcing connection structure 50 can be selectively welded to one of the crossbeam 20, longitudinal beam 30, and upper cover 40 to provide a higher strength connection and improve the stability of the overall structure;

[0064] 5. Adhesive connection: The reinforced connection structure 50 can be selectively bonded to at least one of the cross beam 20, the longitudinal beam 30, and the upper cover 40 using a dedicated adhesive, which can improve the sealing and stability of the connection.

[0065] like Figure 1 As shown, specifically, the cross beam 20, the longitudinal beam 30, and the reinforcing connection structure 50 are projected onto the same horizontal plane along the vertical direction, the projection of the cross beam 20 and the projection of the longitudinal beam 30 form a total projection, and at least a portion of the reinforcing connection structure 50 is located within the total projection.

[0066] This arrangement avoids the reinforced connection structure 50 from blocking the upper portion of the accommodating cavity 11, thereby facilitating the assembly and disassembly of other structures (eg, battery cells) within the accommodating cavity 11.

[0067] Specifically, the battery box also includes a sealing elastic member 60, which is arranged between the reinforcing connection structure 50 and the upper cover body 40, and is respectively abutted against the reinforcing connection structure 50 and the upper cover body 40 to seal at least a portion of the gap between the reinforcing connection structure 50 and the upper cover body 40.

[0068] By providing the sealing elastic member 60 , reliable sealing of at least a portion of the gap between the reinforced connection structure 50 and the upper cover body 40 is achieved, thereby preventing external foreign matter from entering the accommodating cavity 11 and ensuring safety.

[0069] In a specific embodiment of the present application, the sealing elastic member 60 can be made of existing fireproof elastic materials, such as flame-retardant rubber and other materials, which can both cushion the shock and seal while ensuring safety.

[0070] Optionally, the middle and / or upper portion of the reinforcing connecting structure 50 has a hollow space so that the mass of the middle and / or upper portion is less than that of the lower portion. This arrangement further reduces the weight of the reinforcing connecting structure 50 and achieves lightweighting.

[0071] like Figure 1 、 Figure 6 and Figure 7 As shown, the cross beam 20 and the longitudinal beam 30 are fixedly arranged at a cross intersection. At the cross intersection of the cross beam 20 and the longitudinal beam 30, the cross beam 20 has a first matching groove 21, and the longitudinal beam 30 has a second matching groove 31. The inner wall of the first matching groove 21 is limitedly matched with the inner wall of the second matching groove 31; wherein, the ratio of the dimension of the first matching groove 21 in the vertical direction to the dimension of the cross beam 20 in the vertical direction is A, A≤0.5, and the ratio of the dimension of the second matching groove 31 in the vertical direction to the dimension of the longitudinal beam 30 in the vertical direction is B, B≤0.5.

[0072] By setting A≤0.5 and B≤0.5, the first matching groove 21 and the second matching groove 31 are prevented from being too large in size, thereby structurally ensuring that the cross beam 20 and the longitudinal beam 30 have sufficient rigidity and strength.

[0073] In addition, it is worth mentioning that the crossbeams in existing battery boxes are usually designed as a whole without cutting, so that the longitudinal beams can only be designed into two sections, that is, they are divided by the crossbeams, which makes the longitudinal beams narrower and lower in strength, and thus the strength of the battery pack will be relatively low; the present application arranges the first matching groove 21 and the second matching groove 31 to cooperate with each other, so that the crossbeam 20 and the longitudinal beam 30 are both a whole, ensuring that the crossbeam 20 and the longitudinal beam 30 have sufficient strength and rigidity, thereby greatly improving the strength of the battery box and effectively reducing the vibration of the battery box during vehicle driving.

[0074] Specifically, arc welding is used to fix the cross beam 20 and the longitudinal beam 30 at their intersections, and the welds are provided at the edges of the first matching groove 21 and / or the second matching groove 31 .

[0075] By setting a cross intersection and fixing them by arc welding, and setting the weld at the edge of the first matching groove 21 and / or the second matching groove 31, the connection strength between the cross beam 20 and the longitudinal beam 30 is further ensured.

[0076] The present application also provides a battery pack, which includes the above-mentioned battery box and a plurality of battery cells, and the plurality of battery cells are arranged in the accommodating cavity 11 of the protective box body 10.

[0077] The battery pack proposed in this application has high overall strength, and the vibration generated during driving after the battery pack is installed is small. It is reliable and safe, and is suitable for large-scale promotion and use.

[0078] The specific working process and principle of a specific embodiment of the present application are now described in detail as follows:

[0079] 1. The crossbeam in the existing battery box is usually designed as a whole without cutting, so the longitudinal beam can only be designed into two sections, that is, divided by the crossbeam, which makes the longitudinal beam narrower and lower in strength, and thus makes the strength of the battery pack lower. Therefore, this application makes changes; Figure 6 and Figure 7 As shown in , the intersection of the cross beam 20 and the longitudinal beam 30 is processed with a groove of 1 / 2 overlapping height to match each other, and the overlapping position is connected by arc welding. The strength and reliability are higher than the existing technical solution, and the risk of easy failure of the weld position in the existing technical solution can also be effectively avoided;

[0080] 2. Design a pagoda-shaped reinforced connection block 52, such as Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the middle of the reinforcement connection block 52 is fixed to the longitudinal beam 30 by M5 bolts and nuts, and the four ends of the reinforcement connection block 52 are fixed to the transverse and longitudinal beams 30 by blind rivets;

[0081] 3. The upper cover 40 and the reinforced connecting block 52 are connected together by bolts, that is, the upper cover 40, the reinforced connecting block 52 and the protective box body 10 are connected as one, which can greatly improve the strength of the box body and effectively reduce the vibration of the battery pack during vehicle driving, thereby extending the life of the battery pack and reducing the risk of failure. Sealing foam (i.e., sealing elastic member 60) is added between the upper cover 40 and the reinforced connecting block 52 to ensure the sealing effect.

[0082] In summary, the present application provides a battery box and a battery pack. In this solution, a reinforcing connection structure 50 is provided to connect the crossbeam 20, the longitudinal beam 30 and the upper cover 40 respectively, so that the crossbeam 20, the longitudinal beam 30 and the upper cover 40 are relatively fixed, so that the upper cover 40 can be connected to the protective box 10 as a whole through the reinforcing connection structure 50, so that there is an effective force transmission method between the upper cover 40 and the crossbeam 20 and the longitudinal beam 30, which can greatly improve the overall strength of the battery box, effectively reduce the vibration of the battery pack including the battery box during the driving of the vehicle, and thus make the battery pack have a longer life and a lower risk of failure; the present application effectively connects the crossbeam 20 and the longitudinal beam 30 by providing a reinforcing connection structure 50, optimizes the crossbeam 20 and the longitudinal beam 30 The mechanical properties of the intermediate connection are improved, the structural design of the battery box is improved, and the working reliability of the battery box is effectively improved; by setting the area of ​​the lower end face of the reinforced connection structure 50 to be larger than the area of ​​the upper end face, the mass of the lower part of the reinforced connection structure 50 is greater than the mass of the upper part, and the center of mass of the reinforced connection structure 50 is located at the lower part of the reinforced connection structure 50. This setting makes the main mass of the reinforced connection structure 50 concentrated at the connection end with the crossbeam 20 or the longitudinal beam 30, which can better transmit and resist the lateral force or longitudinal force transmitted from the crossbeam 20 or the longitudinal beam 30, and thus, while the reinforced connection structure 50 has sufficient stability and durability, the overall mass of the reinforced connection structure 50 is also smaller, which is convenient for installation and processing, and effectively reduces material cost and processing cost.

[0083] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0084] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0085] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0086] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0087] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0088] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery box, characterized in that: include: A protective box body (10), a crossbeam (20), a longitudinal beam (30), an upper cover body (40) and a reinforcing connection structure (50); the protective box body (10) has an accommodating cavity (11) inside, the crossbeam (20) and the longitudinal beam (30) are respectively fixedly arranged on the inner wall of the accommodating cavity (11); the upper cover body (40) is arranged on the protective box body (10) and is used to seal the accommodating cavity (11); wherein the lower end of the reinforcing connection structure (50) is connected to the crossbeam (20) and the longitudinal beam (30), and the upper end is connected to the upper cover body (40) to relatively fix the three; the area of ​​the lower end face of the reinforcing connection structure (50) is larger than the area of ​​the upper end face.

2. The battery box according to claim 1, characterized in that: The battery box further comprises a connecting piece (51); the reinforced connection structure (50) comprises a reinforced connection block (52), the area of ​​the lower end surface of the reinforced connection block (52) being larger than the area of ​​the upper end surface; the reinforced connection block (52) is fixedly connected to the crossbeam (20) and the longitudinal beam (30), respectively; one end of the connecting piece (51) is connected to the upper cover (40), and the other end passes through the reinforced connection block (52) and is connected to the crossbeam (20) or the longitudinal beam (30).

3. The battery box according to claim 2, characterized in that: The reinforcing connection block (52) is arranged at the cross intersection of the cross beam (20) and the longitudinal beam (30), and is fixedly connected to the cross beam (20) and the longitudinal beam (30) respectively by screw connection or riveting; the connecting piece (51) passes through the middle part of the reinforcing connection block (52) and is threadedly connected to the cross beam (20) or the longitudinal beam (30) to relatively fix the upper cover body (40) and the middle part of the reinforcing connection block (52).

4. The battery box according to claim 3, characterized in that: The reinforcing connecting block (52) comprises a middle connecting body (521) and four platforms (522) respectively fixedly arranged on the outer periphery of the middle connecting body (521), the four platforms (522) being arranged in a cross-like manner, two corresponding platforms (522) being respectively connected to the crossbeam (20), and two corresponding platforms (522) being respectively connected to the longitudinal beam (30); the upper end of the middle connecting body (521) faces the upper cover (40), and the area of ​​the lower end face of the platform (522) is respectively larger than the area of ​​the upper end face of the platform (522) and the area of ​​the upper end face of the middle connecting body (521); the connecting member (51) passes through the middle connecting body (521).

5. The battery box according to claim 4, characterized in that: The platform (522) includes multiple layers of steps (523) stacked in sequence; as the number of layers of the steps (523) increases, the area and mass of the steps (523) gradually decrease.

6. The battery box according to claim 5, characterized in that: The portion of the middle connecting body (521) that is higher than the uppermost step (523) is a boss (524), and a through hole (525) is provided in the middle of the boss (524). One end of the connecting piece (51) having a thread passes through the upper cover (40) and the through hole (525), and is threadedly connected to the crossbeam (20) or the longitudinal beam (30).

7. The battery box according to claim 6, characterized in that: The battery box further includes a sealing elastic member (60), which is disposed between the boss (524) and the upper cover (40) and is respectively abutted against the boss (524) and the upper cover (40) to seal the gap between the boss (524) and the upper cover (40).

8. The battery box according to claim 4, characterized in that: The platform (522) is a stepped platform or an arc-shaped platform structure; the size of the platform (522) gradually decreases from bottom to top.

9. The battery box according to claim 8, characterized in that: Under the condition that the platform (522) is a step platform, the step platform has a lower top surface, an upper top surface, an inclined surface and a vertical surface, the upper top surface is located above the lower top surface and is arranged parallel to the lower top surface, and the area of ​​the upper top surface is smaller than the area of ​​the lower top surface; the inclined surface is arranged at an angle, and its two ends are respectively connected to the upper top surface and the lower top surface; the vertical surface is arranged vertically, and its two ends are respectively connected to the upper top surface and the lower top surface; the shape of the vertical surface is adapted to the outer peripheral shape of the middle connecting body (521), and is fixedly connected to the middle connecting body (521); the lower top surface is in contact with the cross beam (20) or the longitudinal beam (30), and the extension direction of the lower top surface is parallel to the extension direction of the cross beam (20) or the longitudinal beam (30); Under the condition that the platform body (522) is an arc-shaped platform, the step platform has a lower arc surface, an upper arc surface, an inclined curved surface and a vertical curved surface, the upper arc surface is located above the lower arc surface and is arranged in parallel with the lower arc surface, and the area of ​​the upper arc is smaller than the area of ​​the lower arc; the inclined curved surface is arranged at an angle, and its two ends are respectively connected to the upper arc surface and the lower arc surface; the vertical curved surface is arranged vertically, and its two ends are respectively connected to the upper arc surface and the lower arc surface; the shape of the vertical curved surface is adapted to the outer peripheral shape of the middle connecting body (521), and is fixedly connected to the middle connecting body (521); the lower arc surface is in contact with the cross beam (20) or the longitudinal beam (30).

10. The battery box according to claim 1, characterized in that: The crossbeam (20), the longitudinal beam (30), and the reinforcing connection structure (50) are projected onto the same horizontal plane in the vertical direction, the projection of the crossbeam (20) and the projection of the longitudinal beam (30) form a total projection, and at least a portion of the reinforcing connection structure (50) is located within the total projection.

11. The battery box according to claim 1, characterized in that: The battery box further includes a sealing elastic member (60), which is disposed between the reinforcing connection structure (50) and the upper cover (40), and is respectively abutted against the reinforcing connection structure (50) and the upper cover (40) to seal at least a portion of the gap between the reinforcing connection structure (50) and the upper cover (40).

12. The battery box according to claim 1, characterized in that: The middle and / or upper part of the reinforcing connection structure (50) has a hollow space, so that the mass of the middle and / or upper part is smaller than that of the lower part.

13. The battery box according to claim 1, characterized in that: The cross beam (20) and the longitudinal beam (30) are cross-fixed, and at the cross intersection of the cross beam (20) and the longitudinal beam (30), the cross beam (20) has a first matching groove (21), and the longitudinal beam (30) has a second matching groove (31), and the inner wall of the first matching groove (21) is limitedly matched with the inner wall of the second matching groove (31); wherein, the ratio of the size of the first matching groove (21) in the vertical direction to the size of the cross beam (20) in the vertical direction is A, A≤0.5, and the ratio of the size of the second matching groove (31) in the vertical direction to the size of the longitudinal beam (30) in the vertical direction is B, B≤0.

5.

14. The battery box according to claim 13, characterized in that: Arc welding is used to weld and fix the cross beam (20) and the longitudinal beam (30) at the cross intersection, and the weld is set at the edge of the first matching groove (21) and / or the second matching groove (31).

15. A battery pack, characterized in that: The battery pack comprises the battery box according to any one of claims 1 to 14, and the battery pack further comprises a plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodating cavity (11) of the protective box body (10).

Images