Battery box body and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery box body and a battery device, the battery box body comprises a bottom plate and a frame, the frame is used for forming an accommodating space of the battery box body with the bottom plate, and the frame comprises an upper end face deviating from the bottom plate, a lower end face facing the bottom plate and an inner side face connected between the upper end face and the lower end face and facing the accommodating space; wherein the frame comprises a first frame body and a second frame body which are welded to each other, a cavity is formed in the second frame body, and the cavity communicates with the exterior of the containing space; the first frame and the second frame form a welding seam at the welding position, at least part of the welding seam extends to the lower end face of the frame from the upper end face of the frame along the inner side face of the frame, and the ratio of the fusion depth of the welding seam to the wall thickness of the frame area where the welding seam is located is 0.2-0.75. The sealing performance of the battery box body can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box and a battery device. Background Art

[0002] In the related art, the airtightness of the battery case is poor, which easily leads to external foreign matter entering the battery case, thereby damaging the batteries inside the battery case.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a battery box body, which can improve the technical problem of poor airtightness of the battery box body.

[0005] The battery box includes:

[0006] Base plate;

[0007] A frame, used to form a storage space for the battery box with the bottom plate, the frame including an upper end surface facing away from the bottom plate, a lower end surface facing the bottom plate, and an inner side surface connected between the upper end surface and the lower end surface and facing the storage space;

[0008] The frame includes a first frame and a second frame welded to each other, a cavity is formed inside the second frame, and the cavity is connected to the outside of the accommodation space;

[0009] The first frame and the second frame form a weld at the welding position, and the weld at least partially extends from the upper end surface of the frame along the inner side surface of the frame to the lower end surface of the frame, and the ratio of the weld penetration to the wall thickness of the frame area where the weld is located is 0.2-0.75.

[0010] On the one hand, the utility model improves the airtightness of the joint position of the first frame and the second frame by welding inside the battery box, thereby preventing foreign objects such as debris outside the battery box from entering the storage space of the battery box, thereby reducing the risk of the battery insulation structure being damaged by foreign objects; on the other hand, the cavity of the second frame leaks outside the storage space, and foreign objects such as debris in the second frame can be discharged to the outside of the storage space, thereby further reducing the risk of damage to the battery in the storage space; on the other hand, the depth of penetration affects the strength of the weld. If the depth of penetration is too small, the connection strength of the two frames is weak. If the depth of penetration is too large, it will cause welding through, damage the box frame, and the battery box is locally heated too much, and the connection is easy to break, which poses a safety risk. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can ensure the connection strength of the frame and the strength of the battery box; on the other hand, if external welding is selected, then water vapor will be hidden in the second frame with a cavity, and the mounting point is selected on the second frame, and a hole will be dug on the cavity wall, so the inside of the battery box is still connected to the outside world, and the sealing is poor.

[0011] The utility model also provides a battery device, which comprises the battery box body mentioned above.

[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0014] in:

[0015] Figure 1 It is a structural schematic diagram of an exemplary embodiment of a battery box disclosed in the present invention;

[0016] Figure 2 for Figure 1 An enlarged view of a local area AA of the battery device shown;

[0017] Figure 3 for Figure 1 An enlarged view of a local area BB of the battery device shown;

[0018] Figure 4 for Figure 1 A schematic structural diagram of a local area AA of the battery device from another perspective;

[0019] Figure 5 for Figure 1 A schematic structural diagram of a local area AA of the battery device from another perspective;

[0020] Figure 6 for Figure 1 A schematic structural diagram of a local area AA of the battery device from another perspective;

[0021] Figure 7 A cross-sectional view showing the location of a weld in an exemplary embodiment of a battery case of the present disclosure.

[0022] Description of reference numerals:

[0023] 1. Bottom plate; 2. Frame; 21. Upper end surface; 22. Lower end surface; 23. Inner side surface; 3. Accommodating space; 41. First frame; 411. Butt-jointed side wall; 42. Second frame; 421. Outer side surface; 422. End; 425. First structure; 426. Second structure; 5. Weld; 61. First inner end; 62. Second inner end; 71. First outer end; 72. Second outer end; 8. Lifting ear; 81. First lifting ear; 82. Second lifting ear; 9. Cavity; 91. Opening. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0025] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0026] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0027] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0028] like Figure 1-6 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a battery box disclosed in the present invention. Figure 2 for Figure 1 An enlarged view of a local area AA of the battery device is shown, Figure 3 for Figure 1 An enlarged view of a local area BB of the battery device is shown, Figure 4 for Figure 1 The schematic diagram of the structure of the local area AA of the battery device from another perspective, Figure 5 for Figure 1 The schematic diagram of the structure of the local area AA of the battery device from another perspective, Figure 6 for Figure 1 The schematic diagram of the structure of the local area AA of the battery device from another perspective, Figure 7 A cross-sectional view showing the location of a weld in an exemplary embodiment of a battery case of the present disclosure.

[0029] The battery box includes: a bottom plate 1, a frame 2, the frame 2 is used to form a storage space 3 of the battery box with the bottom plate 1, the frame 2 includes an upper end face 21 away from the bottom plate 1, a lower end face 22 facing the bottom plate 1, and an inner side face 23 connected between the upper end face 21 and the lower end face 22 and facing the storage space 3; wherein the frame 2 includes a first frame 41 and a second frame 42 welded to each other, a cavity 9 is formed inside the second frame 42, and the cavity is exposed to the external space of the storage space 3; the first frame 41 and the second frame 42 form a weld 5 at the welding position, the weld 5 at least partially extends from the upper end face 21 of the frame 2 along the inner side face 23 of the frame 2 to the lower end face 22 of the frame 2, and the ratio of the penetration depth h1 of the weld 5 to the wall thickness h2 of the frame area where the weld 5 is located is 0.2-0.75.

[0030] On the one hand, in this exemplary embodiment, the weld 5 at least partially extends from the upper end surface 21 of the frame 2 along the inner side surface 23 of the frame 2 to the lower end surface 22 of the frame 2, that is, the weld 5 covers at least a part of the docking area of ​​the first frame 41 and the second frame 42 on the upper end surface, the weld 5 covers all the docking areas of the first frame 41 and the second frame 42 on the inner side surface, and the weld 5 covers at least a part of the docking area of ​​the first frame 41 and the second frame 42 on the lower end surface. In this exemplary embodiment, the airtightness of the docking position of the first frame 41 and the second frame 42 is improved by welding inside the battery box, thereby preventing foreign matter such as debris outside the battery box from entering the storage space of the battery box, thereby reducing the risk of the battery insulation structure being damaged by foreign matter; on the other hand, the second frame 4 The cavity 9 of 2 leaks out of the accommodation space, and foreign matter such as debris in the second frame 42 can be discharged to the outside of the accommodation space, thereby further reducing the risk of damage to the battery in the accommodation space; on the other hand, the penetration depth affects the strength of the weld. If the penetration depth is too small, the connection strength of the two frames will be weak. If the penetration depth is too large, it will cause welding through and damage the frame of the box. In addition, the battery box will be locally overheated and the connection will be easily broken, posing a safety risk. In this exemplary embodiment, h1 / h2 is set to an appropriate size, which can ensure the connection strength of the frame and the strength of the battery box. On the other hand, if external welding is selected, water vapor will be hidden in the second frame with a cavity, and the mounting point will be selected on the second frame, and a hole will be dug in the cavity wall, so the inside of the battery box is still connected to the outside world and the sealing is poor.

[0031] In this exemplary embodiment, the ratio of the penetration depth h1 of the weld 5 to the wall thickness h2 of the frame area where the weld 5 is located can be equal to 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 065, 0.7, 0.75, etc.

[0032] In this exemplary embodiment, the weld 5 can be formed by arc welding or laser welding. Arc welding has large thermal deformation, but can accommodate a larger frame gap (a gap exists between the two frames to be welded), for example, it can accommodate a frame gap of 2mm-3mm; laser welding has small thermal deformation, and can accommodate a frame gap of less than 1mm.

[0033] In this exemplary embodiment, Figure 1-6 As shown, the first frame 41 can be a stamped part, and the first frame forms an open structure on the side away from the accommodating space 3. On the one hand, this setting can reduce the weight of the first frame 41 and improve the energy density of the whole package; on the other hand, the stamped part is integrally formed, and the first frame 41 has fewer welds, which can improve the reliability of the battery box sealing; in addition, the first frame 41 formed by stamping can improve the production efficiency of the battery box.

[0034] In this exemplary embodiment, the first frame 41 may be the front frame or the rear frame of the battery box, and the second frame 42 may be the left frame or the right frame of the battery box. When the battery box is installed in a vehicle, the wheelbase direction of the vehicle is the front-to-back direction of the battery box, and the direction perpendicular to the wheelbase direction of the vehicle is the left-to-right direction of the battery box.

[0035] In this exemplary embodiment, Figure 1-6 As shown, the second frame 42 can be a rolled part, and the second frame 42 also includes an outer side surface 421 facing away from the accommodating space 3. In the second frame 42, a cavity 9 is formed between the side wall where the inner side surface 23 is located, the side wall where the outer side surface is located, the side wall where the upper end surface 21 is located, and the side wall where the lower end surface 22 is located. In this exemplary embodiment, the second frame 42 is easily impacted. In this exemplary embodiment, the second frame 42 is configured as a rolled part with a cavity 9, so that the structural strength of the second frame 42 can be improved, and the risk of the second frame 42 being damaged by a collision can be reduced. In addition, the rolled part can weld multiple structures with cavities together, for example, Figure 1-6 As shown, the second frame 42 may include a first structure 425 and a second structure 426 welded to each other, and both the first structure 425 and the second structure 426 have a cavity. The rolled part has better support strength, thereby improving the structural stability of the battery box.

[0036] In this exemplary embodiment, Figure 1-6 As shown, a first docking area is formed between the upper end surface 21 of the first frame 41 and the upper end surface 21 of the second frame 42, and the first docking area includes a first inner end 61 close to the accommodating space 3 and a first outer end 71 away from the accommodating space 3. A second docking area is formed between the lower end surface 22 of the first frame 41 and the lower end surface 22 of the second frame 42, and the second docking area includes a second inner end 62 close to the accommodating space 3 and a second outer end 72 away from the accommodating space 3; the weld 5 located on the upper end surface 21 can be extended from the first outer end 71 to the first inner end 61; and / or, the weld 5 located on the lower end surface 22 can be extended from the second outer end 72 to the second inner end 62. This arrangement fully covers the first docking area and the second docking area through the weld 5, thereby further improving the sealing of the battery box.

[0037] In this exemplary embodiment, in other exemplary embodiments, the frame 2 may further include an outer side facing away from the accommodating space 3, and a portion of the weld 5 is located on the outer side of the frame 2. This arrangement may further improve the sealing performance of the battery box.

[0038] In this exemplary embodiment, Figure 1-6As shown, the battery case also includes: a lifting lug 8, which is fixed to the side of the second frame 42 away from the accommodating space 3. The battery case can be conveniently fixed to a vehicle or other target structure through the lifting lug 8. Bolt holes can be provided on the lifting lug 8, and the lifting lug 8 can be fixed to the target structure by bolts. The second frame 42 is a rolled part, and the rolled part has high strength. The lifting lug 8 is arranged on the second frame 42, so as to improve the stability of the battery case suspended by the lifting lug 8. In addition, the lifting lug is arranged on the rolled part, so that the mode of the entire battery case can be improved. Therefore, when the battery device is transported, the weld is also reliable, thereby improving the reliability of the weld structure.

[0039] In this exemplary embodiment, Figure 1-6 As shown, the ear 8 includes: a first ear 81 and a second ear 82. The first ear 81 and the second ear 82 are distributed in a direction perpendicular to the bottom plate 1. The first ear 81 and the second ear 82 are stamped parts. The first ear 81 and the second ear 82 are spliced ​​to form a complete ear. The integrally formed stamped part has high strength and high manufacturing effect. This setting can improve the strength of the ear 8 and improve the manufacturing efficiency of the ear 8.

[0040] In this exemplary embodiment, Figure 1-6 As shown, the first frame 41 may also include: a butt joint side wall 411, which intersects the upper end face 21, the lower end face 22, and the inner side face 23 of the first frame 41; in the second frame 42, the same side end 422 of the side wall where the upper end face 21, the side wall where the lower end face 22, and the side wall where the inner side face 23 are located are at least partially butted against the wall surface of the butt joint side wall 411. This arrangement can make the same side end 422 of the side wall where the upper end face 21, the lower end face 22, and the inner side face 23 in the second frame 42 abut against the butt joint side wall 411 with a larger area, and this arrangement can facilitate the butt joint of the first frame 41 and the second frame 42, and can also facilitate the welding of the first frame 41 and the second frame 42.

[0041] In this exemplary embodiment, the cavity 9 includes an opening 91 exposed outside the accommodating space 3, and the battery box further includes a seal (not shown) for sealing the opening 91. This arrangement can prevent foreign matter such as water from entering the cavity 9, thereby preventing the second frame 42 from rusting.

[0042] In this exemplary embodiment, the sealing member may include one or more of a sealing piece, a plastic member, and a foaming glue.

[0043] In this exemplary embodiment, the battery case may include aluminum and / or steel.

[0044] The present exemplary embodiment also provides a battery device, which includes the above-mentioned battery case and a battery, wherein the battery is located in the accommodating space of the battery case.

[0045] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0046] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0047] In this exemplary embodiment, the battery can be a square battery, that is, the battery can be a quadrangular prism battery. The quadrangular prism battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0048] In other exemplary embodiments, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface located between the two circular end surfaces.

[0049] The battery may be a wound battery, that is, a first pole piece, a second pole piece having electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding core.

[0050] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0051] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0052] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0053] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0054] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0055] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0056] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery box, characterized in that: The battery box comprises: Bottom plate (1); A frame (2) used to form a storage space (3) of the battery box together with the bottom plate (1), the frame (2) comprising an upper end surface (21) facing away from the bottom plate (1), a lower end surface (22) facing the bottom plate (1), and an inner side surface (23) connected between the upper end surface (21) and the lower end surface (22) and facing the storage space (3); The frame (2) comprises a first frame (41) and a second frame (42) which are welded to each other, a cavity (9) is formed inside the second frame (42), and the cavity (9) is exposed to the external space of the accommodating space (3); The first frame (41) and the second frame (42) form a weld (5) at a welding position, the weld (5) at least partially extending from an upper end surface (21) of the frame (2) along an inner side surface (23) of the frame (2) to a lower end surface (22) of the frame (2), and a ratio of a penetration depth of the weld (5) to a wall thickness of a frame region where the weld (5) is located is 0.2-0.

75.

2. The battery box according to claim 1, characterized in that: The first frame (41) is a stamped part, and a side of the first frame facing away from the accommodating space (3) forms an open structure.

3. The battery box according to claim 1, characterized in that: The second frame (42) is a rolled piece, and the second frame (42) further comprises an outer side surface facing away from the accommodating space (3); In the second frame (42), the cavity (9) is formed between the side wall where the inner side surface (23) is located, the side wall where the outer side surface is located, the side wall where the upper end surface (21) is located, and the side wall where the lower end surface (22) is located.

4. The battery box according to claim 1, characterized in that: A first docking area is formed between the upper end surface (21) of the first frame (41) and the upper end surface (21) of the second frame (42), and the first docking area includes a first inner end (61) close to the accommodating space (3) and a first outer end (71) away from the accommodating space (3); A second docking area is formed between the lower end surface (22) of the first frame (41) and the lower end surface (22) of the second frame (42), and the second docking area includes a second inner end (62) close to the accommodating space (3) and a second outer end (72) away from the accommodating space (3); The weld (5) located on the upper end surface (21) extends from the first outer end (71) to the first inner end (61); And / or, the weld (5) located on the lower end surface (22) is extended from the second outer end (72) to the second inner end (62).

5. The battery box according to claim 1, characterized in that: The frame (2) also includes an outer side surface facing away from the accommodating space (3), and a portion of the welding seam (5) is located on the outer side surface of the frame (2).

6. The battery case according to any one of claims 1 to 5, characterized in that: The battery box also includes: A lifting ear (8), wherein the lifting ear (8) is fixed to a side of the second frame (42) facing away from the accommodating space (3).

7. The battery case according to claim 6, characterized in that: The lifting lug (8) comprises: A first lifting lug (81); The second lifting lug (82), the first lifting lug (81) and the second lifting lug (82) are distributed in a direction perpendicular to the bottom plate (1), and the first lifting lug (81) and the second lifting lug (82) are stamped parts.

8. The battery case according to any one of claims 1 to 5, characterized in that: The cavity includes an opening (91) exposed to the outside of the accommodating space (3), and the battery box also includes: A sealing member is used to seal the opening (91).

9. The battery case according to any one of claims 1 to 5, characterized in that: The weld (5) is formed by arc welding or laser welding.

10. A battery device, characterized in that: The battery device comprises a battery box and a battery as described in any one of claims 1 to 9, and the battery is located in a containing space of the battery box.

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