Energy storage box body, battery pack and processing technology of energy storage box body

Abstract

The invention discloses an energy storage box body, a battery pack and a processing technology of the energy storage box body, the energy storage box body comprises a fence and a bottom plate, one end of the fence forms an opening, and the wall thickness of the fence is L1; the bottom plate covers the opening, the bottom plate and the fence enclose to form an accommodating space, the accommodating space is used for arranging a single battery, the thickness of the bottom plate is L2, and L1 is smaller than L2. According to the energy storage box body, the bottom is thickened, and the effective service life of the energy storage box body is prolonged under the condition that extra material loss of the fence is not caused.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to an energy storage box, a battery pack and a processing technology for the energy storage box. Background Art

[0002] For integration considerations, single cells are usually connected in series and parallel through aluminum bars to form energy storage modules, which are then loaded into boxes to make battery packs for application.

[0003] At present, the general method adopted by the industry for processing the box is: punch out a cross-shaped steel plate, fold it to form a side plate perpendicular to the bottom plate, and weld the gap between the side plates to form the box. Limited by the form of cutting, although the box produced by the sheet metal of the above scheme has good production efficiency and sealing, the thickness of the bottom plate and the side plate of the box are close or even the same. The impact and wear on the battery pack are mostly concentrated on the bottom of the box, which means that if the bottom plate of the box is not reinforced, it will become a structural weakness of the box. Summary of the invention

[0004] An object of the present invention is to provide an energy storage box, a battery pack and a processing technology for the energy storage box, which aims to solve the technical problem that the bottom of the existing battery pack is easily worn.

[0005] In order to achieve the above-mentioned purpose, a solution provided by the present invention is: an energy storage box, which includes an enclosure and a bottom plate: an opening is formed at one end of the enclosure, and the wall thickness of the enclosure is L1; the bottom plate covers the opening and is combined with the enclosure to form an accommodating space, and the accommodating space is used to set single cells, and the thickness of the bottom plate is L2, L1<L2.

[0006] In some embodiments of the present application, 1mm≤L1≤1.5mm, 1.6mm≤L2≤2.5mm.

[0007] In some embodiments of the present application, the enclosure includes a first plate, a second plate, a third plate and a fourth plate, and the first plate, the second plate, the third plate and the fourth plate are connected end to end in a circular arc.

[0008] In some embodiments of the present application, the first plate includes a first sub-plate, a second sub-plate, and a second weld. The first sub-plate and the second sub-plate are connected by the second weld. One end of the first sub-plate away from the second weld is connected to the arc of the fourth plate. One end of the second sub-plate away from the second weld is connected to the arc of the second plate. The surface of the first sub-plate is parallel to the surface of the second sub-plate.

[0009] In some embodiments of the present application, the inner diameter of the arc connecting the first plate, the second plate, the third plate and the fourth plate is R1, and R1 ≥ 5 mm;

[0010] The bottom plate is a quadrilateral, the top angle of the bottom plate is an arc, the radius of any top angle of the bottom plate is R2, and 3mm≤R2≤R1.

[0011] In some embodiments of the present application, the energy storage box further includes a first weld, the first weld is arranged around the enclosure, and the enclosure and the bottom plate are connected by the first weld.

[0012] In some embodiments of the present application, the first weld has a welding excess height H1 relative to the enclosure in the wall thickness direction of the enclosure, and / or the first weld has a welding excess height H2 relative to the base plate in the thickness direction of the base plate.

[0013] In some embodiments of the present application, the base plate includes a plate body and a base foot protruding from the plate body, the base foot protrudes toward a side away from the accommodating space, and the base foot smoothly transitions with the plate body, and the metal streamlines of the base plate extend along the surface of the base plate.

[0014] To achieve the above object, another solution provided by the present invention is: a battery pack, the battery pack comprising: a single cell and any one of the above energy storage boxes, the single cell being arranged in the accommodating space.

[0015] To achieve the above object, another solution provided by the present invention is: a process for processing an energy storage box, the process comprising the following steps:

[0016] Providing a fence, wherein at least one end of the fence forms an opening, and the wall thickness of the fence is L1;

[0017] A bottom plate is provided, the thickness of the bottom plate is L2, L1<L2;

[0018] Connect the bottom plate and the enclosure so that the bottom plate covers the opening.

[0019] In some embodiments of the present application, the step of "providing enclosure" includes:

[0020] Providing a side plate, and bending the side plate into a cylindrical shape so that opposite ends of the side plate abut against each other;

[0021] Weld the ends where the side panels abut to form the enclosure.

[0022] In some embodiments of the present application, the step of "providing a base plate" includes:

[0023] Provide a base plate;

[0024] A plurality of feet are formed by stamping on the bottom plate.

[0025] In some embodiments of the present application, the step of "connecting the base plate and the enclosure" includes:

[0026] Welding to form a first weld, with two sides of the first weld respectively connecting the bottom plate and the enclosure;

[0027] Knock off the welding slag on the surface of the first weld. In the wall thickness direction of the enclosure, the first weld has a welding excess height H1 relative to the enclosure. In the thickness direction of the base plate, the first weld has a welding excess height H2 relative to the base plate.

[0028] The beneficial effects of the present invention are:

[0029] The bottom plate covers the opening and is enclosed with the enclosure to form an accommodation space, and the accommodation space is used to arrange the single battery. The wall thickness of the enclosure is L1, and the thickness of the bottom plate is L2, where L1<L2.

[0030] Compared with the prior art, the energy storage box of the present application has a thickened bottom and reinforced the bottom plate that is more susceptible to wear, thereby extending the effective service life of the energy storage box without causing additional material loss in the enclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 is a schematic diagram of the overall structure of the energy storage box provided by an embodiment of the present invention;

[0033] Figure 2 is a schematic cross-sectional structure diagram of an energy storage box provided by an embodiment of the present invention;

[0034] Figure 3 yes Figure 1 A partial enlarged view of the middle A area;

[0035] Figure 4 is a partial detail diagram of the enclosure provided by an embodiment of the present invention;

[0036] Figure 5 yes Figure 2 A partial enlarged view of the middle B area;

[0037] Figure 6 is a schematic diagram of metal flow lines of a base plate provided by an embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of the process flow of the energy storage box processing technology provided by an embodiment of the present invention;

[0039] Figure 8 It is a schematic flow chart of the energy storage box processing step B100 provided in an embodiment of the present invention;

[0040] Fig. 9 It is a schematic flow chart of the energy storage box processing step B200 provided in an embodiment of the present invention;

[0041] Fig.10 It is a flow chart of energy storage box processing step B300 provided in an embodiment of the present invention.

[0042] Description of Figure Numbers:

[0043] 10. enclosure; 11. first plate; 111. first sub-plate; 112. second sub-plate; 113. second weld; 12. second plate; 13. third plate; 14. fourth plate; 20. bottom plate; 21. plate body; 22. bottom foot; 30. accommodation space; 40. first weld. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1 and Figure 2 As shown, Figure 1 is a schematic diagram of the overall structure of the energy storage box provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the energy storage box provided in an embodiment of the present invention.

[0046] In order to solve the technical problem in the prior art that the bottom of a battery pack is easily worn and damaged, the present invention discloses an energy storage box, which includes an enclosure 10 and a bottom plate 20: an opening is formed at one end of the enclosure 10, and the wall thickness of the enclosure 10 is L1; the bottom plate 20 covers the opening and is surrounded by the enclosure 10 to form an accommodating space 30, and the accommodating space 30 is used to arrange single cells, and the thickness of the bottom plate 20 is L2, L1<L2.

[0047] The box body in the prior art is mostly formed by cross-shaped sheet metal cutting, and the side panels and the bottom panel 20 have similar or even the same thickness. Often the side panels are still intact, but the bottom panel 20 has been worn through, which leads to additional maintenance costs and is not conducive to large-scale application of battery packs.

[0048] In the present embodiment, the bottom plate 20 covers the opening of the enclosure 10 to form an accommodating space 30, and the thickness of the bottom plate 20 is greater than the wall thickness of the enclosure 10. That is, without increasing the blanking of the enclosure 10, the thickness of the bottom plate 20 is targetedly thickened, thereby avoiding premature damage of the battery pack due to greater wear on the bottom.

[0049] In some embodiments of the present application, 1mm≤L1≤1.5mm, 1.6mm≤L2≤2.5mm.

[0050] The wall thickness of the enclosure 10 and the thickness of the bottom plate 20 are related to the structural strength of the energy storage box. If the material is too thin, the strength will not meet the normal use of the battery pack. If the wall thickness of the enclosure 10 and the thickness of the bottom plate 20 are too large, the weight of the energy storage box will increase and the energy density of the battery pack will decrease. 1mm≤L1≤1.5mm, 1.6mm≤L2≤2.5mm can reduce the weight of the energy storage box as much as possible while meeting the use requirements. Moreover, within the above range, the service life of the bottom plate 20 and the enclosure 10 is close. Preferably, L1=1.2mm, L2=2mm, and under the premise that the total mass of the energy storage box is constant, the overall service life of the energy storage box is longer.

[0051] In some embodiments of the present application, the enclosure 10 includes a first plate 11, a second plate 12, a third plate 13 and a fourth plate 14, and the first plate 11, the second plate 12, the third plate 13 and the fourth plate 14 are connected end to end in a circular arc.

[0052] The arc-connected first plate 11 , second plate 12 , third plate 13 and fourth plate 14 reduce the ridges, thereby reducing the risk of stress concentration and subsequent cracking of the enclosure 10 at the ridges when the internal pressure of the battery pack increases.

[0053] Furthermore, the first plate 11 includes a first sub-plate 111, a second sub-plate 112 and a second weld 113. The first sub-plate 111 and the second sub-plate 112 are connected by the second weld 113. The end of the first sub-plate 111 away from the second weld 113 is connected to the fourth plate 14 in an arc shape. The end of the second sub-plate 112 away from the second weld 113 is connected to the second plate 12 in an arc shape. The surface of the first sub-plate 111 is parallel to the surface of the second sub-plate 112.

[0054] The first plate 11 includes a first sub-plate 111, a second sub-plate 112 and a second weld 113 connecting the first sub-plate 111 and the second sub-plate 112, that is, the connecting weld of the enclosure 10 is arranged on the side rather than the side edge. On the one hand, the formation of the weld is a process of metal re-solidification after melting. In this process, the internal stress of the arc will be released, resulting in instability of one of the side edges of the enclosure 10 relative to the internal stress of the remaining three side edges, while the docked first sub-plate 111 and second sub-plate 112 do not have the corresponding defects; on the other hand, the formation of the weld will bring about certain dimensional errors. If this part of the error is concentrated at the side edges, it may lead to poor sealing between the enclosure 10 and the bottom plate 20, while it will be relatively safe to set it on the side.

[0055] Please also read Figure 3 and Figure 4 As shown, Figure 3yes Figure 1 A partial enlarged view of the middle A area; Figure 4 It is a partial detail diagram of the enclosure 10 provided in an embodiment of the present invention.

[0056] Optionally, the inner diameter of the arc connecting the first plate 11, the second plate 12, the third plate 13 and the fourth plate 14 is R1, R1≥5mm; the bottom plate 20 is a quadrilateral, the top angle of the bottom plate 20 is an arc, and the radius of any top angle of the bottom plate 20 is R2, 3mm≤R2≤R1.

[0057] R1≥5mm and 3mm≤R2≤R1. On the one hand, it can ensure that stress concentration is not prone to occur at the arc of the enclosure 10, thereby increasing the structural strength of the enclosure 10. On the other hand, part of the top angle of the bottom plate 20 at the side edge of the enclosure 10 is built on the open end face of the enclosure 10, so that the connection strength between the two is higher. When the bottom plate 20 is impacted, it can be better transmitted to the enclosure 10, and the bottom plate 20 will not be separated from the enclosure 10.

[0058] In some embodiments of the present application, the energy storage box further includes a first weld 40 , the first weld 40 is arranged around the enclosure 10 , and the enclosure 10 and the bottom plate 20 are connected through the first weld 40 .

[0059] The welding connection between the enclosure 10 and the base plate 20 can provide higher connection strength and also ensure the sealing of the bottom of the energy storage box.

[0060] Please refer to Figure 5 As shown, Figure 5 yes Figure 2 A partial enlarged view of area B.

[0061] Furthermore, in the wall thickness direction of the enclosure 10, the first weld 40 has a welding excess height H1 relative to the enclosure 10, preferably, H1 ≥ 0.2 mm; and / or, in the thickness direction of the base plate 20, the first weld 40 has a welding excess height H2 relative to the base plate 20, preferably, H2 ≥ 0.2 mm.

[0062] After the existing welding operation, the weld is usually ground flat, which may result in insufficient cross-sectional area of ​​the weld and further cause airtightness defects, which is particularly obvious in the weld at the corner joint of two plates. Therefore, in this embodiment, the welding excess height is retained in the wall thickness of the enclosure 10 and the thickness of the bottom plate 20, which can effectively ensure the airtightness of the first weld 40.

[0063] Please refer to Figure 6 As shown, Figure 6 Schematic diagram of metal flow lines of the base plate 20 provided in an embodiment of the present invention.

[0064] In some embodiments of the present application, the base plate 20 includes a plate body 21 and a base foot 22 protruding from the plate body 21 , the base foot 22 protrudes toward a side away from the accommodating space 30 , and the base foot 22 and the plate body 21 have a smooth transition, and the metal streamlines of the base plate 20 extend along the surface of the base plate 20 .

[0065] The metal streamlines extend along the surface of the bottom plate 20 , which ensures the connection strength between the foot 22 and the plate body 21 . The foot 22 is not easily torn when it encounters an impact, thereby reducing the risk of leakage caused by the foot 22 falling off.

[0066] In order to solve the above technical problems, the present invention further discloses a battery pack, which includes: a single cell and the energy storage box disclosed in any of the above embodiments, and the single cell is arranged in the accommodating space 30.

[0067] Because the battery pack includes the energy storage box disclosed in the above embodiment, the battery pack of this embodiment at least has the technical effect of the above energy storage box. Specifically, the battery pack of this embodiment has a thickened bottom, and the bottom that is more easily worn is reinforced, which prolongs the effective service life of the energy storage box without causing additional material loss of the enclosure 10.

[0068] See also Figure 7 As shown, Figure 7 It is a schematic diagram of the process flow of the energy storage box processing technology provided by an embodiment of the present invention.

[0069] In order to solve the above technical problems, the present invention further discloses a processing technology for an energy storage box, which includes the following steps:

[0070] B100. Provide a fence 10, wherein at least one end of the fence 10 forms an opening, and the wall thickness of the fence 10 is L1; illustratively, 1 mm ≤ L1 ≤ 1.5 mm.

[0071] B200. Provide a bottom plate 20, the thickness of the bottom plate 20 is L2, L1<L2; illustratively, 1.6mm≤L2≤2.5mm.

[0072] B300, connect the bottom plate 20 and the enclosure 10 so that the bottom plate 20 covers the opening.

[0073] The present embodiment provides a processing technology for an energy storage box. Compared with the processing technology of punching a cross-shaped plate and then bending it to form a box in the prior art, the bottom plate 20 and the enclosure 10 of the present embodiment have different thicknesses. The thickness of the bottom plate 20 is greater than the wall thickness of the enclosure 10, thereby avoiding premature damage of the battery pack due to excessive wear on the bottom.

[0074] Please be sure to read Figure 8 As shown, Figure 8It is a schematic flow chart of the energy storage box processing step B100 provided in an embodiment of the present invention.

[0075] In some embodiments of the present application, step B100 includes:

[0076] B101. Provide a side plate, and bend the side plate into a cylindrical shape so that opposite ends of the side plate abut against each other;

[0077] B102. Weld the two ends of the side panels to form a fence 10.

[0078] This embodiment provides a method for forming an enclosure 10. The side panels are formed into the enclosure 10 through bending and welding, which reduces the number of welds during the forming process of the enclosure 10, makes the structure of the enclosure 10 more uniform, and extends the service life of the energy storage box.

[0079] Preferably, the side plate includes a first sub-plate 111, a second plate 12, a third plate 13, a fourth plate 14, and a second sub-plate 112 connected end to end in a circular arc. The first sub-plate 111 and the second sub-plate 112 are parallel to each other after being bent, and the first sub-plate 111 and the second sub-plate 112 are butt-welded to form the enclosure 10. In other words, the connecting weld of the enclosure 10 is arranged on the side rather than the side edge. The formation of the weld is a process of re-solidification after the metal is melted. In this process, the internal stress of the arc will be released, resulting in instability of one of the side edges of the enclosure 10 relative to the internal stress of the remaining three side edges, while the first sub-plate 111 and the second sub-plate 112 that are butt-welded do not have the corresponding defects.

[0080] Please also read Fig. 9 As shown, Fig. 9 It is a flow chart of the energy storage box processing step B200 provided in an embodiment of the present invention.

[0081] In some embodiments of the present application, step B200 includes:

[0082] B201, providing a base plate 20;

[0083] B202. A plurality of feet 22 are formed by punching on the base plate 20.

[0084] In this embodiment, the foot 22 is formed by stamping, that is, the foot 22 and the plate body 21 have a smooth transition, and the metal flow line of the bottom plate 20 extends along the surface of the bottom plate 20. The connection strength between the foot 22 and the bottom plate 20 is higher, and the foot 22 is not easy to tear when it encounters an impact, reducing the risk of leakage caused by the foot 22 falling off.

[0085] Please also read Fig.10 As shown, Fig.10 It is a flow chart of energy storage box processing step B300 provided in an embodiment of the present invention.

[0086] In some embodiments of the present application, step B300 includes:

[0087] B301, welding to form a first weld 40, two sides of the first weld 40 are respectively connected to the bottom plate 20 and the enclosure 10;

[0088] B302. Knock off the welding slag on the surface of the first weld 40. In the wall thickness direction of the enclosure 10, the first weld 40 has a welding excess height H1 relative to the enclosure 10. In the thickness direction of the base plate 20, the first weld 40 has a welding excess height H2 relative to the base plate 20.

[0089] In the prior art, the weld is usually ground after the welding operation, which may result in insufficient cross-sectional area of ​​the weld, thereby causing airtightness defects. In this embodiment, after the first weld 40 is formed, only the welding slag is knocked off without grinding, and the welding excess height is retained in the wall thickness of the enclosure 10 and the thickness of the bottom plate 20, which can effectively ensure the airtightness of the first weld 40, which is particularly effective in the fillet weld of the bottom plate 20 and the enclosure 10.

[0090] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0091] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0092] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0093] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the design concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An energy storage box, characterized in that: include: An enclosure, one end of which forms an opening, and the wall thickness of the enclosure is L1; The bottom plate covers the opening and is enclosed with the enclosure to form an accommodation space, wherein the accommodation space is used to arrange single cells. The thickness of the bottom plate is L2, where L1<L2.

2. The energy storage box according to claim 1, characterized in that: 1mm≤L1≤1.5mm, 1.6mm≤L2≤2.5mm.

3. The energy storage box according to claim 1, characterized in that: The enclosure includes a first plate, a second plate, a third plate and a fourth plate, and the first plate, the second plate, the third plate and the fourth plate are connected in sequence end to end in a circular arc.

4. The energy storage box according to claim 3, characterized in that: The first plate includes a first sub-plate, a second sub-plate and a second weld, the first sub-plate and the second sub-plate are connected by the second weld, one end of the first sub-plate away from the second weld is connected to the fourth plate arc, one end of the second sub-plate away from the second weld is connected to the second plate arc, and the surface of the first sub-plate is parallel to the surface of the second sub-plate.

5. The energy storage box according to claim 3, characterized in that: The inner diameter of the arc connecting the first plate, the second plate, the third plate and the fourth plate is R1, and R1 is ≥ 5 mm; The bottom plate is a quadrilateral, the top angle of the bottom plate is an arc, and the radius of any top angle of the bottom plate is R2, 3mm≤R2≤R1.

6. The energy storage box according to claim 1, characterized in that: The energy storage box also includes a first weld, which is arranged around the enclosure, and the enclosure and the bottom plate are connected by the first weld.

7. The energy storage box according to claim 6, characterized in that: In the wall thickness direction of the enclosure, the first weld has a welding excess height H1 relative to the enclosure, and / or In the thickness direction of the base plate, the first weld has a welding excess height H2 relative to the base plate.

8. The energy storage box according to any one of claims 1 to 7, characterized in that: The bottom plate includes a plate body and a foot protruding from the plate body, the foot protruding toward a side away from the accommodating space, and the foot smoothly transitions with the plate body, and the metal flow line of the bottom plate extends along the surface of the bottom plate.

9. A battery pack, characterized in that: include: The energy storage box according to any one of claims 1 to 8; A single cell battery is disposed in the accommodating space.

10. A process for processing an energy storage box, characterized in that: The following steps are involved: Providing an enclosure, wherein at least one end of the enclosure forms an opening, and the wall thickness of the enclosure is L1; Providing a bottom plate, wherein the thickness of the bottom plate is L2, L1<L2; The bottom plate and the enclosure are connected so that the bottom plate covers the opening.

11. The energy storage box processing technology according to claim 10, characterized in that: The step "Provide enclosure" includes: Providing a side plate, and bending the side plate into a cylindrical shape so that opposite ends of the side plate abut against each other; The two ends of the side plates are welded to form a fence.

12. The energy storage box processing technology according to claim 10, characterized in that: The step "providing a base plate" includes: Provide a base plate; A plurality of feet are formed by punching on the bottom plate.

13. The energy storage box processing technology according to claim 10, characterized in that: The step of "connecting the base plate and the enclosure" includes: Welding to form a first weld, wherein two sides of the first weld are respectively connected to the bottom plate and the enclosure; Knock off the welding slag on the surface of the first weld. In the wall thickness direction of the enclosure, the first weld has a welding excess height H1 relative to the enclosure. In the thickness direction of the base plate, the first weld has a welding excess height H2 relative to the base plate.

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