Battery cell shell and battery cell

Abstract

The battery cell shell comprises a side shell, a first end of the side shell is bent in the circumferential direction and then forms a splicing seam with a second end of the side shell and an accommodating cavity with two open ends, the first end is provided with a limiting step, the second end is provided with a clamping part, and the clamping part is clamped on the limiting step. Molten metal at the splicing seam is first welding seam metal, and the clamping part is welded to the limiting step through the first welding seam metal. The side shell of the battery cell shell is bent to form the splicing seam and the accommodating cavity, and the splicing seam is connected through the first welding seam metal, so that only one welding seam is formed in the circumferential direction of the side shell, the number of the welding seams and the welding process are reduced, and meanwhile, the clamping part of the second end is clamped on the limiting step of the first end, so that the welding quality is improved. According to the side shell, the limiting and fixing effects between the first end and the second end are improved, alignment welding is facilitated, in addition, a wide sealing edge and a folded edge are not needed in the connecting mode, a thick shell cannot appear at the welding position after welding, and the size of the side shell is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric core shell and electric core. BACKGROUND

[0002] At present, the shell of existing electric core is mostly made of aluminum alloy, which has low strength and is not resistant to high temperature, and the aluminum alloy shell cannot bear large pressure, so it has poor safety. A small part of electric cores use thin-walled stainless steel as the shell of electric core, but the stainless steel shell needs to be formed into a side shell through multiple bending, roll bending and multiple welding processes, and then a top cover and a bottom plate are installed at both ends of the side shell, which leads to complex process and large and uneven welding protrusions in the welding seam of the formed side shell, resulting in poor connection quality, large occupied space, low energy density of the electric core and inability to meet the requirements of large capacity and high strength of the electric core. SUMMARY

[0003] The utility model solves the technical problem of overcoming the defects of poor quality of the electric core shell in the prior art and provides an electric core shell and an electric core.

[0004] The utility model solves the above technical problems by the following technical solutions:

[0005] An electric core shell made of steel includes a side shell, a first end of the side shell is bent in a circumferential direction to form a splicing seam and a receiving cavity with a second end of the side shell, the first end is provided with a limiting step, the second end is provided with a clamping part, the clamping part is clamped on the limiting step, the molten metal at the splicing seam is a first welding seam metal, and the clamping part is welded to the limiting step through the first welding seam metal.

[0006] In this scheme, the electric core shell is made of steel, can bear high pressure, has high strength and is not easy to deform, the side shell forms a splicing seam and a receiving cavity after bending, is connected by a first welding seam metal at the splicing seam, has only one welding seam in the circumferential direction of the side shell, reduces the number of welding seams and welding processes, improves the strength of the side shell, the clamping part of the second end is clamped on the limiting step of the first end, improves the limiting and fixing effect between the first end and the second end, facilitates alignment and welding, and in addition, this connection method does not need a wide sealing edge and a folded edge, and after welding, there is no thick shell at the welding position, reducing the volume of the side shell.

[0007] Preferably, the limiting step includes a first segment, a second segment and a third segment connected in sequence, the first segment and the third segment are located on different sides of the two ends of the second segment respectively and are perpendicular to the second segment.

[0008] In the scheme, the first section and the third section are arranged at different sides of the two ends of the second section and are perpendicular to the second section, so that the limiting steps are obtained by bending, and the processing is convenient.

[0009] Preferably, the length of the second section along the thickness direction of the side shell ranges from 1 to 1.5 times the thickness of the side shell.

[0010] Preferably, the length of the third section along the width direction of the side shell ranges from 2 to 5 times the thickness of the side shell.

[0011] In the scheme, when the length of the second section along the thickness direction of the side shell is less than 1 times the thickness of the side shell, the connection strength of the clamping part and the limiting step is low, which cannot meet the strength requirement, and when the length of the second section along the thickness direction of the side shell is greater than 1.5 times the thickness of the side shell, the second section occupies more space of the accommodating cavity, so the length of the second section along the thickness direction of the side shell is arranged to range from 1 to 1.5 times the thickness of the side shell, which not only ensures the connection strength requirement of the weld, but also does not occupy more internal space of the side shell.

[0012] When the length of the third section along the width direction of the side shell is less than 2 times the thickness of the side shell, the limiting step is relatively shallow and cannot accommodate the width of the splicing joint, and the welding cannot be performed or the welding quality is poor after the welding, so the strength requirement cannot be met, and when the length of the third section along the width direction of the side shell is greater than 5 times the thickness of the side shell, the weight of the side shell increases, the material is wasted, and the space of the accommodating cavity is also occupied, so the length of the third section along the width direction of the side shell is arranged to range from 2 to 5 times the thickness of the side shell, which not only ensures the connection strength requirement of the weld, but also does not occupy more internal space of the side shell.

[0013] Preferably, the limiting step is arranged outside the first end.

[0014] In the scheme, after the limiting step is clamped with the clamping part, the splicing joint is outside the side shell, so that the welding is convenient, and the outer surface of the first end and the second end after the welding is flat.

[0015] Preferably, the outer surface of the clamping part is a plane.

[0016] In the scheme, the outer surface of the clamping part is arranged as a plane, so that the clamping part is aligned with the limiting step for welding, and the outer surface of the side shell after the welding of the clamping part and the limiting step is flat.

[0017] Preferably, the outer surface of the first section is flush with the outer surface of the clamping part.

[0018] In the scheme, the above structure is arranged, so that the welding is convenient, and the outer surface of the side shell after the welding is a plane.

[0019] Preferably, the inner surface of the side shell near the joint is planar.

[0020] Preferably, the cross section of the accommodating cavity is rectangular, and the joint is located at the short side of the rectangle.

[0021] In this solution, the inner surface of the side shell near the joint is planar, so that the inner surface of the side shell has no concave-convex structure, and the structure of the accommodating cavity is regular, facilitating the installation of the lamination of the battery cell, while the welding seam is shielded by the wall of the limiting step, and does not affect the internal space and structure of the accommodating cavity.

[0022] The cross section of the accommodating cavity is set as a rectangle, facilitating the formation of a square battery cell, and a plurality of square battery cells are integrated to form a battery cell assembly, so as to improve the energy density. By setting the joint at the short side of the square battery cell, the welding seam is not formed on the larger surface of the battery cell, ensuring the strength requirement of the battery cell shell.

[0023] Preferably, the battery cell shell further comprises a top cover and a bottom plate, the top cover and the bottom plate are respectively installed and sealed on the two openings, and the top cover and the bottom plate are welded to the side shell.

[0024] In this solution, the top cover and the bottom plate are welded on the openings at the two ends of the side shell to form a complete steel shell, which can withstand a large pressure and is not easy to deform, and has high strength.

[0025] Preferably, the surface edge of the top cover towards the side shell is recessed inward to form a ring-shaped first clamping groove, the end of the side shell is clamped and welded in the first clamping groove, the molten metal at the welding seam between the top cover and the side shell is a second welding seam metal, and the top cover is welded to the side shell through the second welding seam metal.

[0026] Preferably, the surface edge of the bottom plate towards the side shell is recessed inward to form a ring-shaped second clamping groove, the end of the side shell is clamped and welded in the second clamping groove, the molten metal at the welding seam between the bottom plate and the side shell is a third welding seam metal, and the bottom plate is welded to the side shell through the third welding seam metal.

[0027] In this solution, the end of the side shell is clamped in the first clamping groove, and the two are welded together, so that the limiting and fixing effect between the side shell and the top cover is improved, and at the same time, this sealing method does not form a thick shell, and a wide sealing edge and a folded edge are not needed, thereby reducing the volume of the shell.

[0028] A battery cell, comprising the battery cell shell as described above.

[0029] On the basis of common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily, that is, the preferred embodiments of the present application are obtained.

[0030] The positive progress effect of the utility model lies in: the steel material of the battery cell shell can bear higher pressure, has high strength and is not easy to deform, and the side shell forms a splice joint and a containing cavity after being bent, the side shell has only one weld joint in the circumferential direction of itself by the first weld joint metal connection at the splice joint, the number of weld joints and the welding process are reduced, the strength of the side shell is improved, meanwhile, the clamping part of the second end is clamped on the limiting step of the first end, the limiting and fixing effect between the first end and the second end is improved, and it is convenient to align and weld, in addition, the connection mode does not need a wide sealing edge and a folded edge, and after welding, there will not be a thick shell at the welding position, the volume of the side shell is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure diagram of the battery cell shell of a preferred embodiment of the utility model Figure 1 .

[0032] Figure 2 The explosion of the battery cell shell of a preferred embodiment of the utility model Figure 2 .

[0033] Figure 3 The structure diagram of the battery cell shell of a preferred embodiment of the utility model Figure 3 .

[0034] Figure 4 For Figure 3 The enlarged view of A part in the figure (after welding).

[0035] Figure 5 For Figure 3 The enlarged view of A part in the figure (before welding).

[0036] Figure 6 The structure diagram of the battery cell shell of a preferred embodiment of the utility model Figure 4 .

[0037] Figure 7 For Figure 6 The sectional view along B-B line in the figure.

[0038] Figure 8 For Figure 7 The enlarged view of C part in the figure.

[0039] Figure 9 For Figure 7 The enlarged view of D part in the figure.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] Side shell 1

[0042] Splice joint 11

[0043] Containing cavity 12

[0044] limiting step 13

[0045] first section 131

[0046] second section 132

[0047] third section 133

[0048] clamping portion 14

[0049] first weld metal 2

[0050] width 21 of first weld metal

[0051] height 22 of first weld metal

[0052] depth 23 of first weld metal

[0053] top cover 3

[0054] first clamping groove 31

[0055] second weld metal 32

[0056] width 321 of second weld metal

[0057] height 322 of second weld metal

[0058] depth 323 of second weld metal

[0059] bottom plate 4

[0060] second clamping groove 41

[0061] third weld metal 42

[0062] thickness direction 100 of side shell

[0063] width direction 200 of side shell

[0064] direction 300 from outside to inside DETAILED DESCRIPTION

[0065] The utility model will be more clearly and completely explained by way of example and in conjunction with the drawings, but the utility model is not limited in the scope of the described examples.

[0066] As Figures 1-9 shown, the utility model discloses an electric core shell, the electric core shell material is steel, and the electric core shell includes a side shell 1, the first end of the side shell 1 is bent along the circumference and forms a splicing seam 11 and a two-end opening containing cavity 12 with the second end of the side shell 1, the first end is equipped with a limiting step 13, the second end is equipped with a clamping portion 14, the clamping portion 14 is clamped in the limiting step 13, the molten metal at the splicing seam 11 is a first weld metal 2, and the clamping portion 14 is welded to the limiting step 13 through the first weld metal 2.

[0067] As Figures 2-5 shown in the embodiment, the shell is made of steel, which can bear high pressure, has high strength and is not easy to deform. The side shell 1 is bent to form a joint 11 and a receiving cavity 12. The joint 11 is connected by a first welding metal 2, so that the side shell 1 has only one welding seam in the circumferential direction, reducing the number of welding seams and welding processes, improving the strength of the side shell 1, and the second end of the clamping part 14 is clamped in the limiting step 13 of the first end, improving the limiting and fixing effect between the first end and the second end, and facilitating alignment and welding. In addition, this connection method does not require a wide sealing edge and a folded edge, and after welding, there is no thick shell at the welding position, reducing the volume of the side shell 1.

[0068] As Figures 2-5 shown, the limiting step 13 is arranged on the outside of the first end. After the limiting step 13 is clamped with the clamping part 14, the joint 11 is on the outside of the side shell 1, facilitating welding, and also enabling the outer surface of the first end and the second end to be flat after welding.

[0069] As Figures 2-5 shown, the outer surface of the clamping part 14 is flat. Arranging the outer surface of the clamping part 14 as a flat surface facilitates the alignment of the clamping part 14 and the limiting step 13 for welding, and also facilitates the flat outer surface of the side shell 1 after the clamping part 14 and the limiting step 13 are welded.

[0070] As Figures 2-5 shown, the outer surface of the first segment 131 is flush with the outer surface of the clamping part 14, facilitating welding, and also facilitating the flat outer surface of the side shell 1 after welding.

[0071] In the embodiment, as Figure 5 shown, the limiting step 13 includes a first segment 131, a second segment 132 and a third segment 133 connected in sequence. The first segment 131 and the third segment 133 are respectively located on different sides of the two ends of the second segment 132 and are perpendicular to the second segment 132, facilitating the obtaining of the limiting step 13 by bending, convenient processing, and facilitating the connection of the clamping part 14 and the limiting step 13.

[0072] As Figure 5As shown, the length of the second section 132 along the thickness direction 100 of the side shell 1 ranges from 1 to 1.5 times the thickness of the side shell 1. When the length of the second section 132 along the thickness direction 100 of the side shell 1 is less than 1 times the thickness of the side shell 1, the limiting step 13 is relatively shallow, and the connecting strength of the clamping portion 14 and the limiting step 13 is low, which cannot meet the strength requirement. When the length of the second section 132 along the thickness direction 100 of the side shell 1 is greater than 1.5 times the thickness of the side shell 1, the second section 132 will protrude inwardly, occupying more space of the accommodating cavity 12. Therefore, the length of the second section 132 along the thickness direction 100 of the side shell 1 is set to range from 1 to 1.5 times the thickness of the side shell 1, which not only ensures the connecting strength requirement at the weld, but also does not occupy much internal space of the side shell 1.

[0073] As shown in FIG. 1, Figure 5 As shown, the length of the third section 133 along the width direction 200 of the side shell 1 ranges from 2 to 5 times the thickness of the side shell 1. When the length of the third section 133 along the width direction 200 of the side shell 1 is less than 2 times the thickness of the side shell 1, the limiting step 13 will be relatively shallow and cannot accommodate the width of the splicing seam 11, which cannot be welded or the weld quality after welding is poor, and thus cannot meet the strength requirement. When the length of the third section 133 along the width direction 200 of the side shell 1 is greater than 5 times the thickness of the side shell 1, the weight of the side shell 1 will increase, the material will be wasted, and the space of the accommodating cavity 12 will also be occupied. Therefore, the length of the third section 133 along the width direction 200 of the side shell 1 is set to range from 2 to 5 times the thickness of the side shell 1, which not only ensures the connecting strength requirement at the weld, but also does not occupy much internal space of the side shell 1.

[0074] In another embodiment, the inner surface of the side shell near the splicing seam is a plane, so that the inner surface of the side shell has no concave-convex structure, the structure of the accommodating cavity is regular, the lamination of the battery cell is facilitated, the weld is shielded by the wall surface of the limiting step, and the internal space and structure of the accommodating cavity are not affected. The limiting step can be obtained by bending the side shell or by inwardly recessing the end edge of the side shell, so that a plane is formed on the inner surface of the side shell near the splicing seam.

[0075] As shown in FIG. 1, Figures 1-3 As shown, the cross section of the accommodating cavity 12 is rectangular, and the splicing seam 11 is located on the short side of the rectangle. The cross section of the accommodating cavity 12 is set to be rectangular, which facilitates the formation of a square battery cell, and multiple square battery cells are integrated and assembled into a battery cell assembly to improve the energy density. By setting the splicing seam 11 on the short side of the square battery cell, the weld is not on the larger surface of the battery cell, and the strength requirement of the battery cell shell is ensured.

[0076] As shown in FIG. 1, Figure 1 and Figure 2The battery cell casing also includes a top cover 3 and a bottom plate 4. The top cover 3 and the bottom plate 4 are respectively installed and seal two openings. Both the top cover 3 and the bottom plate 4 are welded to the side shell 1. By welding the top cover 3 and the bottom plate 4 to the openings at both ends of the side shell 1, a complete steel casing is formed. The steel casing can withstand greater pressure, is not easily deformed, and has high strength.

[0077] In this embodiment, the thickness of the side shell 1 ranges from 0.2 to 1 mm. Since the side shell 1 is made of steel, when the thickness of the side shell 1 is less than 0.2 mm, the side shell 1 is too thin and easily deformed and cracked. When the thickness of the side shell 1 is greater than 1 mm, the strength of the side shell 1 will be excessive, and it will also result in a thick wall, which is very uneconomical. Therefore, setting the thickness of the side shell 1 to between 0.2 and 1 mm satisfies both the strength requirements of the battery cell shell and the requirement of thin shell wall, making it economical and practical.

[0078] like Figure 4 As shown, the size of the first weld metal 2 gradually decreases from the outside to the inside in the direction 300. By gradually decreasing the size of the first weld metal 2 from the outside to the inside in the direction 300, the impact of the first weld metal 2 on the internal space of the side shell 1 is minimized while ensuring the connection strength.

[0079] like Figure 4 As shown, the width 21 of the first weld metal 2 ranges from 1 to 5 times the thickness of the side shell 1. When the width 21 of the first weld metal 2 is less than 1 times the thickness of the side shell 1, a weak point is easily formed at the weld, and the connection strength of the weld cannot meet the strength requirements. When the width 21 of the first weld metal 2 is greater than 5 times the thickness of the side shell 1, a wider weld will be formed at the junction of the side shell 1 and the top cover 3, which will cause both overstrength at the weld and an unsightly weld. Therefore, setting the width 21 of the first weld metal 2 to 1 to 5 times the thickness of the side shell 1 can ensure the connection strength requirements and obtain an aesthetically pleasing weld.

[0080] like Figure 4 As shown, the height 22 of the first weld metal 2 is greater than 0 and less than 0.5 mm. When the height 22 of the first weld metal 2 is greater than 0.5 mm, it will bulge outward on the surface of the side shell 1, and the welding strength will also be excessive. Therefore, setting the height 22 of the first weld metal 2 to be greater than 0 and less than 0.5 mm satisfies the strength requirements of the weld and makes the weld and the side shell 1 look simple and beautiful.

[0081] like Figure 4As shown, the depth 23 of the first weld metal 2 ranges from 1 to 2 times the thickness of the side shell 1. When the depth 23 of the first weld metal 2 is less than 1 times the thickness of the side shell 1, the welding strength at the spliced joint 11 cannot meet the connection strength requirement, and when the depth 23 of the first weld metal 2 is greater than 2 times the thickness of the side shell 1, the first weld metal 2 protrudes from the inner wall of the side shell 1 and occupies the space of the accommodating cavity 12, so the depth 23 of the first weld metal 2 is set to range from 1 to 2 times the thickness of the side shell 1, to ensure the connection strength requirement and not to occupy the internal space of the side shell 1.

[0082] As shown in Figures 6-8 As shown, the surface edge of the top cover 3 towards the side shell 1 is inwardly recessed to form a ring-shaped first clamping groove 31, and the end of the side shell 1 is clamped and welded in the first clamping groove 31, and the molten metal at the welding joint of the top cover 3 and the side shell 1 is a second weld metal 32, and the top cover 3 is welded and connected with the side shell 1 through the second weld metal 32. By clamping one end of the side shell 1 in the first clamping groove 31 and welding and connecting them, the limiting and fixing effect between the side shell 1 and the top cover 3 is improved, and at the same time, this sealing method does not need a thicker shell and a wider sealing edge and folding edge, thereby reducing the volume of the shell.

[0083] As shown in Figure 8 As shown, the size of the second weld metal 32 gradually decreases in the direction 300 from outside to inside. By gradually reducing the size of the second weld metal 32 in the direction 300 from outside to inside, the influence of the second weld metal 32 on the internal space of the side shell 1 is small on the basis of ensuring the connection strength.

[0084] As shown in Figure 8 As shown, the width 321 of the second weld metal 32 ranges from 1 to 5 times the thickness of the side shell 1. When the width 321 of the second weld metal 32 is less than 1 times the thickness of the side shell 1, a weak part is easily formed at the welding joint, and the connection strength of the welding joint cannot meet the strength requirement, and when the width 321 of the second weld metal 32 is greater than 5 times the thickness of the side shell 1, a wider welding joint is formed at the joint of the side shell 1 and the top cover 3, which not only causes the strength of the welding joint to be excessive, but also forms an unattractive welding joint, so the width 321 of the second weld metal 32 is set to range from 1 to 5 times the thickness of the side shell 1, which can not only ensure the connection strength requirement, but also obtain an attractive welding joint.

[0085] As shown in Figure 8 As shown, the height 322 of the second weld metal ranges from greater than 0 to not greater than 0.5 mm. When the height 322 of the second weld metal is greater than 0.5 mm, it will protrude outward from the surface of the side shell 1, and the welding strength will also be excessive, so the height 322 of the second weld metal is set to range from greater than 0 to less than 0.5 mm, which not only meets the strength requirement of the welding joint, but also makes the welding joint look simple and beautiful.

[0086] As shown in Figure 8 The depth 323 of the second weld metal 32 ranges from 1 to 2 times the thickness of the side shell 1. Since the second weld metal 32 is located at the corner of the battery cell shell, when the depth 323 of the second weld metal 32 is less than 1 times the thickness of the side shell 1, the strength requirement cannot be met, and when the depth 323 of the second weld metal 32 is greater than 2 times the thickness of the side shell 1, the second weld metal 32 will protrude from the inner wall of the side shell 1 and occupy the space of the accommodating cavity 12, so the depth 323 of the second weld metal 32 is set to range from 1 to 2 times the thickness of the side shell 1, to ensure the connection strength requirement, and also will not occupy the internal space of the side shell 1.

[0087] As shown in Figure 6 , Figure 7 and Figure 9 The surface edge of the bottom plate 4 towards the side shell 1 is inwardly recessed to form an annular second clamping groove 41, the end of the side shell 1 is clamped and welded in the second clamping groove 41, the molten metal at the weld between the bottom plate 4 and the side shell 1 is a third weld metal 42, and the bottom plate 4 is welded and connected with the side shell 1 through the third weld metal 42. By clamping one end of the side shell 1 in the second clamping groove 41 and welding and connecting them, the limiting and fixing effect between the side shell 1 and the bottom plate 4 is improved, and at the same time, this sealing method does not require a thicker side shell 1, and does not require a wider sealing edge and a folding edge, thereby reducing the volume of the side shell 1.

[0088] The setting parameters of the third weld metal 42 are the same as those of the second weld metal 32, which will not be described here.

[0089] The embodiment also discloses a battery cell comprising the battery cell shell.

[0090] In the description herein, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0091] Although the specific embodiments of the utility model have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, and these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A battery cell casing, the material of which is steel, characterized in that, The battery cell housing includes a side shell. The first end of the side shell is bent circumferentially to form a splicing seam and a receiving cavity with openings at both ends with the second end of the side shell. The first end is provided with a limiting step, and the second end is provided with a snap-fit ​​part. The snap-fit ​​part is snapped into the limiting step. The molten metal at the splicing seam is the first weld metal. The snap-fit ​​part is welded to the limiting step through the first weld metal.

2. The battery cell casing as described in claim 1, characterized in that, The limiting step includes a first segment, a second segment, and a third segment connected in sequence. The first segment and the third segment are located on different sides of the two ends of the second segment and are perpendicular to the second segment.

3. The battery cell casing as described in claim 2, characterized in that, The length of the second segment along the thickness direction of the side shell ranges from 1 to 1.5 times the thickness of the side shell; And / or, the length of the third segment along the width direction of the side shell ranges from 2 to 5 times the thickness of the side shell.

4. The battery cell casing as described in claim 2, characterized in that, The limiting step is located on the outer side of the first end.

5. The battery cell casing as described in claim 4, characterized in that, The outer surface of the snap-fit ​​part is flat.

6. The cell casing as described in claim 4, characterized in that, The outer surface of the first segment is flush with the outer surface of the snap-fit ​​portion.

7. The battery cell casing as described in claim 1, characterized in that, The inner surface of the side shell near the splice seam is flat; And / or, the cross-section of the receiving cavity is rectangular, and the splice seam is located on the shorter side of the rectangle.

8. The battery cell casing as described in claim 1, characterized in that, The battery cell casing also includes a top cover and a bottom plate. The top cover and the bottom plate are respectively installed on and seal the two openings. The top cover and the bottom plate are both welded to the side shell.

9. The battery cell casing as described in claim 8, characterized in that, The top cover is recessed inward toward the surface edge of the side shell to form an annular first groove. The end of the side shell is engaged and welded to the first groove. The molten metal at the weld between the top cover and the side shell is the second weld metal. The top cover is welded to the side shell through the second weld metal. And / or, the bottom plate is recessed inward toward the surface edge of the side shell to form an annular second groove, the end of the side shell is engaged and welded to the second groove, the molten metal at the weld between the bottom plate and the side shell is the third weld metal, and the bottom plate is welded to the side shell through the third weld metal.

10. A battery cell, characterized in that, The battery cell includes a battery cell casing as described in any one of claims 1-9.

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