Energy storage box and battery pack

Abstract

The utility model discloses an energy storage box body and a battery pack, 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] This utility model relates to the field of energy storage equipment technology, and in particular to an energy storage box and a battery pack. Background Technology

[0002] For the sake of integration, individual cells are usually connected in series and parallel with aluminum busbars to form energy storage modules, and then loaded into a housing to form a battery pack for application.

[0003] Currently, the industry standard for battery enclosure manufacturing is to punch cross-shaped steel plates, fold them to form side plates perpendicular to the base plate, and weld the gaps between the side plates to form the enclosure. While this sheet metal production method offers good production efficiency and sealing due to the limitations of the cutting process, the base plate and side plates of the enclosure have similar or even identical thicknesses. Since the impacts and wear experienced by the battery pack are concentrated at the bottom of the enclosure, the base plate, if not reinforced, will become a structural weakness. Utility Model Content

[0004] One objective of this invention is to provide an energy storage box and battery pack that address the technical problem of easy wear and tear on the bottom of existing battery packs.

[0005] To achieve the above objectives, the present invention provides a solution as follows: an energy storage box, which includes a enclosure and a bottom plate: one end of the enclosure forms an opening, and the wall thickness of the enclosure is L1; the bottom plate covers the opening and encloses the enclosure to form an accommodating space, the accommodating space is used to house individual batteries, and the thickness of the bottom plate is L2, where L1 < L2.

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

[0007] In some embodiments of this application, the fence includes a first plate, a second plate, a third plate, and a fourth plate, which are connected end to end in a sequential arc.

[0008] In some embodiments of this 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. The end of the first sub-plate away from the second weld is connected to the fourth plate in an arc. The end of the second sub-plate away from the second weld is connected to the second plate in an arc. The surface of the first sub-plate is parallel to the surface of the second sub-plate.

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

[0010] The base plate is quadrilateral, with rounded corners at the top. The radius of any corner of the base plate is R2, where 3mm ≤ R2 ≤ R1.

[0011] In some embodiments of this application, the energy storage box further includes a first weld, around which a barrier is provided, and the barrier and the base plate are connected by the first weld.

[0012] In some embodiments of this application, the first weld seam in the wall thickness direction of the enclosure has a weld reinforcement height H1 relative to the enclosure.

[0013] In some embodiments of this application, the first weld has a weld reinforcement height H2 relative to the base plate in the thickness direction.

[0014] In some embodiments of this application, the base plate includes a plate body and a foot protruding from the plate body. The foot protrudes toward the side opposite to the accommodating space, and the foot smoothly transitions to the plate body. The metal streamlines of the base plate extend along the surface of the base plate.

[0015] To achieve the above objectives, another solution provided by this utility model is: a battery pack, which includes: individual batteries and an energy storage box as described above, wherein the individual batteries are disposed within the accommodating space.

[0016] The beneficial effects of this utility model are as follows:

[0017] The bottom plate covers the opening and is enclosed by the fence to form an accommodating space. The accommodating space is used to install individual batteries. The wall thickness of the fence is L1, and the thickness of the bottom plate is L2, where L1 < L2.

[0018] Compared with the prior art, the energy storage tank of this application has a thickened bottom and reinforced the bottom plate which is more susceptible to wear, thus extending the effective service life of the energy storage tank without causing additional material loss to the enclosure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the energy storage box provided in this embodiment of the utility model;

[0021] Figure 2 This is a cross-sectional structural schematic diagram of the energy storage box provided in an embodiment of the present utility model;

[0022] Figure 3 yes Figure 1 A magnified view of a portion of region A in the middle;

[0023] Figure 4 This is a partial detail view of the fence provided in an embodiment of this utility model;

[0024] Figure 5 yes Figure 2 A magnified view of a portion of region B in the middle;

[0025] Figure 6 This is a schematic diagram of the metal streamlines of the base plate provided in this embodiment of the utility model;

[0026] Figure 7 This is a flowchart illustrating the processing technology of the energy storage box provided in this embodiment of the utility model;

[0027] Figure 8 This is a flowchart illustrating step B100 of the energy storage box processing technology provided in this embodiment of the utility model.

[0028] Figure 9 This is a flowchart illustrating step B200 of the energy storage box processing technology provided in this embodiment of the utility model.

[0029] Figure 10 This is a flowchart illustrating step B300 of the energy storage box processing technology provided in this embodiment of the utility model.

[0030] Explanation of icon numbers:

[0031] 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. Base plate; 21. Plate body; 22. Foot; 30. Accommodation space; 40. First weld. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the overall structure of the energy storage box provided in this embodiment of the utility model; Figure 2 This is a cross-sectional structural diagram of the energy storage box provided in an embodiment of the present utility model.

[0034] To address the technical problem of easy wear and damage to the bottom of battery packs in existing technologies, this utility model discloses an energy storage box, which includes a enclosure 10 and a bottom plate 20: one end of the enclosure 10 forms an opening, and the wall thickness of the enclosure 10 is L1; the bottom plate 20 covers the opening and encloses the enclosure 10 to form an accommodating space 30, which is used to house individual batteries, and the thickness of the bottom plate 20 is L2, where L1 < L2.

[0035] In the existing technology, the casing is mostly formed by cutting sheet metal in a cross shape. The side plates and the bottom plate 20 have similar or even the same thickness. Often, the side plates are still intact, but the bottom plate 20 has already been worn through. This leads to additional maintenance costs and is not conducive to the large-scale application of battery packs.

[0036] In this 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 adding extra material to the enclosure 10, the thickness of the bottom plate 20 is specifically increased to avoid premature damage to the battery pack due to greater wear at the bottom.

[0037] In some embodiments of this application, 1mm≤L1≤1.5mm, 1.6mm≤L2≤2.5mm.

[0038] The wall thickness of the enclosure 10 and the thickness of the base plate 20 both affect the structural strength of the energy storage box. If the material is too thin, the strength will be insufficient for the normal use of the battery pack. Conversely, if the wall thickness of the enclosure 10 and the thickness of the base plate 20 are too large, the weight of the energy storage box will increase, leading to a decrease in the energy density of the battery pack. A thickness of 1mm ≤ L1 ≤ 1.5mm and 1.6mm ≤ L2 ≤ 2.5mm can minimize the weight of the energy storage box while meeting usage requirements. Moreover, within these ranges, the service life of the base plate 20 and the enclosure 10 is similar. Preferably, L1 = 1.2mm and L2 = 2mm, which, with a constant total mass of the energy storage box, results in a longer overall service life.

[0039] In some embodiments of this application, the enclosure 10 includes a first plate 11, a second plate 12, a third plate 13, and a fourth plate 14, which are connected end to end in a circular arc.

[0040] The arc-connected first plate 11, second plate 12, third plate 13 and fourth plate 14 reduce the number of ridges, thus reducing the risk of stress concentration and cracking of the enclosure 10 at the ridges when the internal pressure of the battery pack rises.

[0041] 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 arc-connected to the fourth plate 14. The end of the second sub-plate 112 away from the second weld 113 is arc-connected to the second plate 12. The surface of the first sub-plate 111 is parallel to the surface of the second sub-plate 112.

[0042] 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 located on the side rather than the side edge. On the one hand, the formation of the weld is a process of re-solidification after the metal is melted. During this process, the internal stress of the arc is released, causing the internal stress of one side edge of the enclosure 10 to become unstable relative to the remaining three side edges. However, the first sub-plate 111 and the second sub-plate 112 that are joined do not have the corresponding defects. On the other hand, the formation of the weld will bring certain dimensional errors. If these errors are concentrated at the side edge, they may lead to poor sealing between the enclosure 10 and the base plate 20. However, setting it on the side is relatively safe.

[0043] Please refer to the following: Figure 3 and Figure 4 As shown, Figure 3 yes Figure 1 A magnified view of a portion of region A in the middle; Figure 4 This is a partial detail view of the enclosure 10 provided in this embodiment of the utility model.

[0044] 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, where R1 ≥ 5mm; the base plate 20 is a quadrilateral, the apex of the base plate 20 is an arc, and the radius of any apex of the base plate 20 is R2, where 3mm ≤ R2 ≤ R1.

[0045] R1≥5mm and 3mm≤R2≤R1, on the one hand, can ensure that stress concentration does not easily occur at the arc of the enclosure 10, increasing the structural strength of the enclosure 10. On the other hand, the bottom plate 20 has part of its top corners overlapping the opening end face of the enclosure 10 at the side edge, making the connection strength between the two higher. When the bottom plate 20 is impacted, it can also be better transmitted to the enclosure 10, so that the bottom plate 20 does not detach from the enclosure 10.

[0046] In some embodiments of this application, the energy storage box further includes a first weld 40, which surrounds the enclosure 10, and the enclosure 10 and the base plate 20 are connected through the first weld 40.

[0047] The welded connection between the enclosure 10 and the base plate 20 provides higher connection strength and also ensures the sealing of the bottom of the energy storage box.

[0048] Please refer to the above as well. Figure 5 As shown, Figure 5 yes Figure 2 A magnified view of a portion of region B in the middle.

[0049] Furthermore, in the wall thickness direction of the enclosure 10, the first weld 40 has a welding allowance H1 relative to the enclosure 10, preferably H1≥0.2mm.

[0050] Optionally, the first weld 40 in the thickness direction of the base plate 20 has a weld reinforcement height H2 relative to the base plate 20, preferably H2≥0.2mm.

[0051] Existing welding operations typically involve grinding the weld seam smooth, which may result in insufficient cross-sectional area of ​​the weld seam, leading to airtightness defects. This is particularly noticeable in weld seams where two plates meet at an angle. Therefore, in this embodiment, welding allowance is retained in both the wall thickness of the enclosure 10 and the thickness of the base plate 20, which can effectively ensure the airtightness of the first weld seam 40.

[0052] Please refer to the above as well. Figure 6 As shown, Figure 6 This is a schematic diagram of the metal streamlines of the base plate 20 provided in this embodiment of the utility model.

[0053] In some embodiments of this application, the base plate 20 includes a plate body 21 and a foot 22 protruding from the plate body 21. The foot 22 protrudes toward the side opposite to the accommodating space 30, and the foot 22 smoothly transitions with the plate body 21. The metal flow lines of the base plate 20 extend along the surface of the base plate 20.

[0054] Metal flow lines extend along the surface of the base plate 20, which ensures the connection strength between the foot 22 and the plate 21, making the foot 22 less prone to tearing when it is impacted, and reducing the risk of leakage due to the foot 22 falling off.

[0055] To solve the above-mentioned technical problems, this utility model also discloses a battery pack, which includes: a single battery cell and an energy storage box disclosed in any of the above embodiments, wherein the single battery cell is disposed in the accommodating space 30.

[0056] Because the battery pack includes the energy storage housing disclosed in the above embodiments, the battery pack of this embodiment at least possesses the technical effects of the aforementioned energy storage housing. Specifically, the battery pack of this embodiment has a thickened bottom, reinforcing the bottom which is more prone to wear, thus extending the effective service life of the energy storage housing without causing additional material loss to the enclosure 10.

[0057] Please see Figure 7 As shown, Figure 7 This is a flowchart illustrating the processing technology of the energy storage box provided in this embodiment of the utility model.

[0058] To more clearly illustrate the application scenarios of the energy storage box in this application, this utility model also discloses a processing technology for the energy storage box, which includes the following steps:

[0059] B100, providing a fence 10, with at least one end of the fence 10 forming an opening, and the wall thickness of the fence 10 being L1; for example, 1mm≤L1≤1.5mm.

[0060] B200, Provide a base plate 20, the thickness of the base plate 20 is L2, L1 < L2; for example, 1.6mm ≤ L2 ≤ 2.5mm.

[0061] B300 connects the base plate 20 and the enclosure 10, so that the base plate 20 covers the opening.

[0062] This embodiment provides a processing technology for energy storage boxes. Compared with the existing technology of punching cross-shaped plates and then bending them to form the box, the bottom plate 20 and the enclosure 10 in this embodiment have different thicknesses. The thickness of the bottom plate 20 is greater than the wall thickness of the enclosure 10, which avoids the battery pack from prematurely breaking due to greater wear at the bottom.

[0063] Please be sure to refer to this. Figure 8 As shown, Figure 8 This is a flowchart illustrating step B100 of the energy storage box processing technology provided in this embodiment of the utility model.

[0064] In some embodiments of this application, step B100 includes:

[0065] B101. Provide side panels, and bend the side panels into a cylindrical shape so that the opposite ends of the side panels abut against each other;

[0066] B102, Weld the two ends of the side plates to form enclosure 10.

[0067] This embodiment provides a method for forming the enclosure 10. The side plates are formed by bending and welding to form the enclosure 10, 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.

[0068] 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 by a sequential arc. The first sub-plate 111 and the second sub-plate 112 are parallel to each other after bending, and are butt-welded to form a enclosure 10. In other words, the connecting weld of the enclosure 10 is located on the side rather than the side edge. The formation of the weld is a process of re-solidification after the metal is melted. During this process, the internal stress of the arc is released, causing one of the side edges of the enclosure 10 to become unstable relative to the remaining three side edges, while the butt-welded first sub-plate 111 and the second sub-plate 112 do not have the corresponding defects.

[0069] Please refer to the following: Figure 9 As shown, Figure 9 This is a flowchart illustrating step B200 of the energy storage box processing technology provided in this embodiment of the utility model.

[0070] In some embodiments of this application, step B200 includes:

[0071] B201, Provide base plate 20;

[0072] B202. Multiple feet 22 are formed by stamping on the base plate 20.

[0073] In this embodiment, the foot 22 is formed by stamping, that is, the foot 22 and the plate 21 are smoothly transitioned, and the metal flow lines of the base plate 20 extend along the surface of the base plate 20. The connection strength between the foot 22 and the base plate 20 is higher, and the foot 22 is not easy to tear when it is impacted, reducing the risk of leakage caused by the foot 22 falling off.

[0074] Please refer to the following: Figure 10 As shown, Figure 10 This is a flowchart illustrating step B300 of the energy storage box processing technology provided in this embodiment of the utility model.

[0075] In some embodiments of this application, step B300 includes:

[0076] B301. Welding forms the first weld 40, with the base plate 20 and the enclosure 10 connected to both sides of the first weld 40 respectively;

[0077] B302. Remove the slag from the surface of the first weld 40. The first weld 40 has a welding height H1 relative to the enclosure 10 in the wall thickness direction and a welding height H2 relative to the base plate 20 in the thickness direction.

[0078] In existing technologies, the weld seam is usually ground smooth after welding, which may result in insufficient cross-sectional area of ​​the weld seam, leading to airtightness defects. In this embodiment, after the first weld seam 40 is formed, only the weld slag is knocked off without grinding. The weld reinforcement is retained in both the wall thickness of the enclosure 10 and the thickness of the base plate 20, which can effectively ensure the airtightness of the first weld seam 40. This is especially effective in the corner welds between the base plate 20 and the enclosure 10.

[0079] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0080] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0081] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0082] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the design concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An energy storage box, characterized in that, include: A fence, one end of which has an opening, and the fence has a wall thickness of L1; The base plate covers the opening and encloses the enclosure to form an accommodating space, which is used to house a single battery cell. The thickness of the base plate is L2, where L1 < L2. The first weld connects the enclosure and the base plate.

2. The energy storage tank of claim 1, wherein, 1mm≤L1≤1.5mm, 1.6mm≤L2≤2.5mm.

3. The energy storage tank of claim 1, wherein, The enclosure includes a first panel, a second panel, a third panel, and a fourth panel, which are connected end-to-end in a sequential arc.

4. The energy storage tank of claim 3, wherein, 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. The end of the first sub-plate away from the second weld is connected to the fourth plate by an arc. The end of the second sub-plate away from the second weld is connected to the second plate by an arc. The surface of the first sub-plate is parallel to the surface of the second sub-plate.

5. The energy storage tank of claim 3, wherein, The inner diameter of the arc connecting the first plate, the second plate, the third plate and the fourth plate is R1, where R1 ≥ 5mm; The base plate is quadrilateral, and the apex of the base plate is an arc. The radius of any apex of the base plate is R2, and 3mm≤R2≤R1.

6. The energy storage tank of claim 1, wherein, The first weld is surrounded by the enclosure.

7. The energy storage tank of claim 6, wherein, The first weld has a weld reinforcement height H1 relative to the fence in the wall thickness direction.

8. The energy storage tank of claim 6, wherein, The first weld has a weld reinforcement height H2 relative to the base plate in the thickness direction.

9. The energy storage tank of any one of claims 1-8, wherein, The base plate includes a plate body and a foot protruding from the plate body. The foot protrudes toward the side opposite to the accommodating space, and the foot smoothly transitions to the plate body. The metal streamlines of the base plate extend along the surface of the base plate.

10. A battery pack, characterized by, include: Energy storage box as described in any one of claims 1-8; A single battery cell, wherein the single battery cell is disposed within the accommodating space.

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