Battery lower box body and battery

Abstract

The utility model discloses a battery lower box body and a battery, the battery lower box body comprises a bottom plate and two edge beams, the bottom plate comprises a first plate body and a second plate body which are spaced along the vertical direction; the two edge beams are connected to the two ends of the bottom plate in the width direction correspondingly, and each edge beam comprises a third plate body connected with the first plate body and a fourth plate body connected with the second plate body; wherein the first plate body and the two third plate bodies are integrally formed parts, and the second plate body and the two fourth plate bodies are integrally formed parts. According to the battery lower box body disclosed by the utility model, the first plate body and the two third plate bodies are integrally formed parts, the second plate body and the two fourth plate bodies are integrally formed parts, and the first plate body and the second plate body are connected to form the battery lower box body, so that the structural strength of the battery lower box body can be improved, and welding points between the third plate bodies and the fourth plate bodies can be reduced; and the processing technology of the battery lower box body is simplified, and the processing difficulty of the battery lower box body is reduced.

Description

Technical Field

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

[0002] In the related technology, the lower box body is the most important protective structure of the battery pack, which is mainly composed of four peripheral beams and a middle reinforcement beam. The common lower shell side beam structure mostly adopts aluminum alloy profile welding, aluminum alloy casting and other solutions. However, the material properties of aluminum alloy profiles also lead to its low strength, which is difficult to meet the current requirements for the anti-extrusion ability of the battery pack structure. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery lower box, wherein the first plate and the two third plates are integrally formed, and the second plate and the two fourth plates are integrally formed, and the two are connected to construct the battery lower box, thereby reducing the welding points between the third plate and the fourth plate, and increasing the structural strength of the battery lower box.

[0004] According to the battery lower box of the first aspect embodiment of the utility model, it includes: a bottom plate, the bottom plate includes a first plate body and a second plate body spaced apart in the up and down directions; two side beams, the two side beams are respectively connected to the two ends of the bottom plate in the width direction, and the two side beams each include a third plate body connected to the first plate body and a fourth plate body connected to the second plate body; wherein the first plate body and the two third plate bodies are an integrally formed part, and the second plate body and the two fourth plate bodies are an integrally formed part.

[0005] According to the battery lower box of the embodiment of the utility model, the first plate body and the two third plate bodies are an integrally formed part, and the second plate body and the two fourth plate bodies are an integrally formed part, which are connected to construct the battery lower box body, which can not only increase the structural strength of the battery lower box body, but also reduce the welding points between the third plate body and the fourth plate body, simplify the processing technology of the battery lower box body, and reduce the processing difficulty of the battery lower box body.

[0006] According to some embodiments of the present invention, the first plate body is integrally formed to form a plurality of reinforcing beams, and the plurality of reinforcing beams are spaced apart along the width direction of the bottom plate.

[0007] According to some embodiments of the present invention, the corners of the side beams have rounded corners extending inwards.

[0008] According to some embodiments of the present invention, the radius of the rounded corner is R, satisfying: R≥3mm.

[0009] According to some embodiments of the utility model, a plurality of cavities are defined in the side beam, and the plurality of cavities are respectively a first cavity, a second cavity and a third cavity from top to bottom, the fourth plate body extends upward and is bent to form the second cavity, the fourth plate body has a first flange located in the third cavity, the first flange abuts against the fourth plate body, the third plate body is located on the inner side of the second cavity and extends upward and is bent above the second cavity to form the first cavity, the third plate body has a second flange located above the first cavity, and the second flange abuts against the fourth plate body.

[0010] According to some embodiments of the present invention, the spacing space constructed between the first plate body and the second plate body is filled with a first buffer component; and / or the cavity is filled with a second buffer component.

[0011] According to some embodiments of the utility model, the height of the first flange in the up-down direction is L1, satisfying: 3mm≤L1≤8mm; the dimension of the second flange in the width direction of the side beam is L2, satisfying: 3mm≤L2≤8mm.

[0012] According to some embodiments of the present invention, a distance between the first plate body and the second plate body in the up-down direction is h1, satisfying: h1 ≥ 10 mm.

[0013] According to some embodiments of the present invention, the height of the reinforcing beam is h2, satisfying: h2≥10mm; the dimension of the reinforcing beam in the width direction of the bottom plate is L3, satisfying: L3≥10mm.

[0014] The battery according to the embodiment of the first aspect of the utility model includes: the battery lower box according to the embodiment of the first aspect of the utility model.

[0015] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery lower box body, not only the structural strength of the battery lower box body can be increased, but also the welding points between the third plate body and the fourth plate body can be reduced, the processing technology of the battery lower box body can be simplified, and the processing difficulty of the battery lower box body can be reduced.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a battery lower box according to some embodiments of the utility model;

[0019] Figure 2 yes Figure 1 The front view of the lower battery box;

[0020] Figure 3 yes Figure 2 The enlarged view of A in FIG.

[0021] Figure 4 yes Figure 2 Enlarged view of point B in FIG.

[0022] Reference numerals:

[0023] 100. Battery lower box;

[0024] 10. bottom plate; 11. first plate body; 111. reinforcing beam; 12. second plate body;

[0025] 20. Side beam; 21. Third plate; 211. Second flange; 22. Fourth plate; 221. First flange; 222. Chamfer; 23. Cavity; 231. First cavity; 232. Second cavity; 233. Third cavity. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Reference below Figure 1-Figure 4 The battery lower case 100 according to the embodiment of the present invention is described.

[0030] According to the battery lower box 100 of the first aspect embodiment of the utility model, the battery lower box 100 includes a bottom plate 10 and two side beams 20, the bottom plate 10 includes a first plate 11 and a second plate 12 spaced apart in the up and down directions; the two side beams 20 are respectively connected to the two ends of the bottom plate 10 in the width direction, and the two side beams 20 each include a third plate 21 and a fourth plate 22, that is, the third plate 21 has two, and the fourth plate 22 also has two, the two third plate bodies 21 are respectively connected to the two ends of the first plate 11 in the width direction of the bottom plate 10, and the two fourth plate bodies 22 are respectively connected to the two ends of the second plate 12 in the width direction of the bottom plate 10.

[0031] Among them, the first plate body 11 and the two third plate bodies 21 are an integrally formed part, and the second plate body 12 and the two fourth plate bodies 22 are an integrally formed part. The battery lower case 100 can be processed by bending and welding the first plate body 11, the two third plate bodies 21, the second plate body 12 and the two fourth plate bodies 22. The battery lower case 100 is constructed by the first plate body 11 and the two third plate bodies 21 after integral processing and the second plate body 12 and the two fourth plate bodies 22 after integral processing, which can increase the structural strength of the battery lower case 100, reduce the welding points between the third plate body 21 and the fourth plate body 22, simplify the processing technology of the battery lower case 100, and reduce the processing difficulty of the battery lower case 100.

[0032] The battery lower box 100 uses high-strength steel as the base material and is manufactured by rolling and welding processes.

[0033] According to the battery lower case 100 of the embodiment of the utility model, the first plate 11 and the two third plates 21 are an integrally formed part, and the second plate 12 and the two fourth plates 22 are an integrally formed part, which are connected to construct the battery lower case 100, which can not only increase the structural strength of the battery lower case 100, but also reduce the welding points between the third plate 21 and the fourth plate 22, simplify the processing technology of the battery lower case 100, and reduce the processing difficulty of the battery lower case 100.

[0034] According to some embodiments of the present invention, referring to 1- Figure 2 The first plate body 11 is integrally formed to form a plurality of reinforcing beams 111, which can not only increase the structural strength of the reinforcing beams 111, but also save the processing of connecting the reinforcing beams 111 to the first plate body 11. The plurality of reinforcing beams 111 are spaced apart along the width direction of the bottom plate 10, and the plurality of reinforcing beams 111 can increase the structural strength of the battery lower box 100.

[0035] According to some embodiments of the present invention, referring to 2- Figure 3 The corner of the side beam 20 has a rounded corner 222 extending inward (the inward side is the side of the side beam 20 close to the center of the battery lower box 100), which can avoid stress concentration at the corner of the side beam 20 and prevent the assembler from scratching himself when assembling the third plate 21 and the fourth plate 22. The design of the rounded corner 222 can also improve the utilization rate of the internal space of the battery pack, and effectively increase the sealing area of ​​the upper surface of the side beam 20, thereby improving the airtightness of the entire pack.

[0036] According to some embodiments of the present invention, referring to 2- Figure 3 The radius of the rounded corner 222 is R, which satisfies: R ≥ 3 mm, so as to avoid the rounded corner 222 being too small to seal the battery pack. For example, the radius of the rounded corner 222 can be 3 mm, 4 mm, 5 mm or 6 mm.

[0037] According to some embodiments of the present invention, referring to 1- Figure 2 A plurality of cavities 23 are defined in the side beam 20 , and the plurality of cavities 23 are respectively a first cavity 231 , a second cavity 232 , and a third cavity 233 from top to bottom, which can increase the anti-extrusion capability of the side beam 20 .

[0038] The side beam 20 is in the shape of a Chinese character 'Mu' in the up and down direction. The fourth plate body 22 extends upward and bends to form a second cavity 232. The fourth plate body 22 has a first flanging 221 located in the third cavity 233. The first flanging 221 abuts against the fourth plate body 22 and is fixed by welding or bonding to improve the connection strength between the third plate body 21 and the fourth plate body 22. The third plate body 21 is located inside the second cavity 232, extends upward, and bends above the second cavity 232 to form a first cavity 231. The third plate body 21 has a second flanging 211 located above the first cavity 231. The second flanging 211 abuts against the fourth plate body 22 and is fixed by welding or bonding to improve the connection strength between the third plate body 21 and the fourth plate body 22.

[0039] Round corners are provided at the corners of the first cavity 231, the second cavity 232, and the third cavity 233.

[0040] In a specific example, the cross-section of the second cavity 232 is rectangular. The angles of two adjacent corners of the second cavity 232 are α and γ respectively, satisfying: 90° ≤ α ≤ 135°, 45° ≤ γ ≤ 90°, and α + γ = 180°. Preferably, α is 90° and γ is 90°, which can improve the structural stability of the second cavity 232. The width of the side wall of the second cavity 232 in the width direction of the side beam 20 is L4, and L4 ≥ 15 mm. The width of the side wall of the second cavity 232 can be 15 mm, 17 mm, 19 mm, or 20 mm, etc.

[0041] The height of the third cavity 233 is h3, and h3 ≥ 30 mm. The height of the third cavity 233 can be 30 mm, 32 mm, 35 mm, or 37 mm, etc.

[0042] According to some embodiments of the present invention, referring to 1- Figure 4 , a first buffer is filled in the spaced space formed between the first plate body 11 and the second plate body 12; and / or, a second buffer is filled in the cavity 23; it can be that a first buffer is filled in the spaced space; it can also be that a second buffer is filled in the cavity 23; or it can be that a first buffer is filled in the spaced space and a second buffer is filled in the cavity 23. Both the first buffer and the second buffer can absorb external impacts and also have the ability to reduce vibrations, thereby enhancing the bottom protection ability of the battery pack.

[0043] For example, both the first buffer and the second buffer can be buffer foams.

[0044] According to some embodiments of the present invention, referring to 2- Figure 3The height of the first flange 221 in the vertical direction is L1, which satisfies: 3mm≤L1≤8mm. The first flange 221 is a welding point of the third plate 21 and the fourth plate 22. A smaller welding width will result in insufficient welding strength. A larger welding width will increase the cost and cause deformation of the third plate 21 and the fourth plate 22. For example, the width of the first flange 221 in the vertical direction can be 3mm, 5mm, 7mm or 8mm.

[0045] The dimension of the second flange 211 in the width direction of the side beam 20 is L2, which satisfies: 3mm≤L2≤8mm. The second flange 211 is another welding point of the third plate 21 and the fourth plate 22. A smaller welding width will result in insufficient welding strength. A larger welding width will increase the cost and cause deformation of the third plate 21 and the fourth plate 22. For example, the width of the second flange 211 in the width direction of the side beam 20 can be 3mm, 5mm, 7mm or 8mm.

[0046] According to some embodiments of the present invention, referring to 2- Figure 4 The distance between the first plate body 11 and the second plate body 12 in the vertical direction is h1, which satisfies: h1≥10mm. The distance between the first plate body 11 and the second plate body 12 in the vertical direction meets the above requirements, which can not only improve the structural strength of the bottom plate 10, but also the spacing space between the first plate body 11 and the second plate body 12 can absorb the impact from the bottom of the battery pack.

[0047] For example, the distance between the first plate body 11 and the second plate body 12 in the vertical direction may be 10 mm, 11 mm, 12 mm, or 13 mm.

[0048] According to some embodiments of the present invention, referring to 2- Figure 4 , the height of the reinforcing beam 111 is h2, satisfying: h2 ≥ 10mm; the dimension of the reinforcing beam 111 in the width direction of the bottom plate 10 is L3, satisfying: L3 ≥ 10mm. According to the simulation and experimental structure, the larger the height h2 of the reinforcing beam 111 and the width L3 of the reinforcing beam 111, the higher the stiffness, the larger the mode, and the greater the structural strength of the reinforcing beam 111.

[0049] For example, the height h2 of the reinforcing beam 111 can be 10 mm, 11 mm, 12 mm or 13 mm, etc.; for another example, the dimension L3 of the reinforcing beam 111 in the width direction of the base plate 10 can be 10 mm, 11 mm, 12 mm or 13 mm, etc.

[0050] The corners of the reinforcing beam 111 are all provided with rounded corners. The reinforcing beam 111 is perpendicular to the first plate body 11 . The angle between the side wall of the reinforcing beam 111 and the first plate body 11 is β, and β=90°.

[0051] The battery according to the embodiment of the first aspect of the utility model comprises: the battery lower box 100 according to the embodiment of the first aspect of the utility model.

[0052] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery lower box 100, not only the structural strength of the battery lower box 100 can be increased, but also the welding points between the third plate 21 and the fourth plate 22 can be reduced, thereby simplifying the processing technology of the battery lower box 100 and reducing the processing difficulty of the battery lower box 100.

[0053] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery lower box, characterized in that: include: A bottom plate, the bottom plate comprising a first plate body and a second plate body spaced apart in an up-down direction; Two side beams, the two side beams are respectively connected to the two ends of the bottom plate in the width direction, and the two side beams each include a third plate body connected to the first plate body and a fourth plate body connected to the second plate body; wherein, The first plate body and the two third plate bodies are an integrally formed part, and the second plate body and the two fourth plate bodies are an integrally formed part.

2. The battery lower box according to claim 1, characterized in that: The first plate body is integrally formed to form a plurality of reinforcing beams, and the plurality of reinforcing beams are spaced apart along a width direction of the bottom plate.

3. The battery lower box according to claim 1, characterized in that: The corners of the side beams are provided with rounded corners extending toward the inside.

4. The battery lower box according to claim 3, characterized in that: The radius of the rounded corner is R, satisfying: R≥3mm.

5. The battery lower box according to claim 1, characterized in that: A plurality of cavities are defined in the side beam, and the plurality of cavities are respectively a first cavity, a second cavity and a third cavity from top to bottom. The fourth plate body extends upward and is bent to form the second cavity. The fourth plate body has a first flange located in the third cavity, and the first flange abuts against the fourth plate body. The third plate body is located on the inner side of the second cavity and extends upward and is bent above the second cavity to form the first cavity. The third plate body has a second flange located above the first cavity, and the second flange abuts against the fourth plate body.

6. The battery lower box according to claim 5, characterized in that: The spacing space formed between the first plate body and the second plate body is filled with a first buffer component; and / or the cavity is filled with a second buffer component.

7. The battery lower box according to claim 5, characterized in that: The height of the first flange in the up-down direction is L1, which satisfies: 3mm≤L1≤8mm; the dimension of the second flange in the width direction of the side beam is L2, which satisfies: 3mm≤L2≤8mm.

8. The battery lower box according to claim 1, characterized in that: A distance between the first plate body and the second plate body in a vertical direction is h1, which satisfies: h1≥10 mm.

9. The battery lower box according to claim 2, characterized in that: The height of the reinforcing beam is h2, satisfying: h2≥10mm; the dimension of the reinforcing beam in the width direction of the bottom plate is L3, satisfying: L3≥10mm.

10. A battery, characterized in that: include: The battery lower case according to any one of claims 1 to 9.

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