Battery cell shell and battery cell
By using a steel cell casing and welded metal connections of specific dimensions, the problems of cell casing strength and welding complexity were solved, enabling a high-strength and high-energy-density cell design.
Patent Information
- Application Number
- CN202422884949.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing battery cell casing materials have low strength and are not resistant to high temperatures. The welding process is complex and the welds are uneven, resulting in low energy density of the battery cells, which cannot meet the requirements for large capacity and high strength.
The battery cell casing is made of steel, and the splicing seams and housing cavity are formed by bending. The splicing seams are connected with weld metal of specific size to reduce the number of welds and processes, and ensure the strength and aesthetics of the welds.
It improves the strength and energy density of the battery cells, reduces the volume and space occupied by the weld, simplifies the welding process, and ensures the quality of the connection.
Smart Images
Figure CN223583066U_ABST
Abstract
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 withstand 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 on both ends of the side shell, which leads to complex process, and after forming, the welding protrusions inside and outside the welding seam of the side shell are large and uneven in volume, the connection quality is poor, the space occupied is large, the energy density of the electric core is low, and it cannot meet the requirements of large capacity and high strength of the electric core. SUMMARY
[0003] The technical problem to be solved by the utility model is to overcome the defects of poor quality of electric core shell, and provide an electric core shell and 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 circumferentially bent to form a splicing seam and a two-end opening accommodating cavity with a second end of the side shell, the first end and the second end are welded and connected, the molten metal at the splicing seam is a first weld seam metal, the size of the first weld seam metal gradually decreases from outside to inside, the width of the first weld seam metal ranges from 1 to 5 times the thickness of the side shell, the height of the first weld seam metal ranges from greater than 0 to not more than 0.2 mm, and the depth of the first weld seam metal ranges from 0.5 to 1 times the thickness of the side shell.
[0006] In the scheme, the cell shell is made of steel material, which can withstand high pressure, has high strength and is not easy to deform. The side shell is bent to form a splice joint and a receiving cavity. The side shell is connected by the first weld metal at the splice joint, so that the side shell has only one weld in the circumferential direction of the side shell, which reduces the number of welds and welding processes, improves the strength of the side shell, and also gradually reduces the size of the first weld metal from the outside to the inside, which ensures the strength of the weld and makes the first weld metal have little effect on the internal space of the side shell. When the width of the first weld metal is less than 1 times the thickness of the side shell, a weak part is easily formed at the splice joint, which cannot meet the connection strength requirement. When the width of the first weld metal is greater than 5 times the thickness of the side shell, a wide weld is formed on the side shell, which not only causes the strength of the splice joint to be excessive, but also forms an unsightly weld. Therefore, the width of the first weld metal is set to be 1-5 times the thickness of the side shell, which can not only ensure the connection strength requirement, but also obtain an aesthetic weld. When the height of the first weld metal is greater than 0.2 mm, the surface of the side shell will protrude outward, and the welding strength will also be excessive. Therefore, the height of the first weld metal is set to be greater than 0 and less than 0.2 mm, which not only meets the strength requirement of the weld, but also makes the weld and the side shell look simple and beautiful. When the depth of the first weld metal is less than 0.5 times the thickness of the side shell, the welding strength at the splice joint cannot meet the connection strength requirement. When the depth of the first weld metal is greater than 1 times the thickness of the side shell, the first weld metal will protrude from the inner wall of the side shell and occupy the space of the receiving cavity. Therefore, the depth of the first weld metal is set to be 0.5-1 times the thickness of the side shell, which ensures the connection strength requirement and does not occupy the internal space of the side shell. In summary, the first weld metal with the above parameters has a small weld bump volume, moderate connection strength and good quality on the outside of the splice joint, and there is no weld bump on the inside of the splice joint, which does not occupy the receiving cavity space of the side shell, so as to improve the energy density of the cell.
[0007] Preferably, the thickness of the side shell is 0.2-1 mm.
[0008] In the scheme, since the material of the side shell is steel, when the thickness of the side shell is less than 0.2 mm, the thickness of the side shell is thin and easy to deform and break. When the thickness of the side shell is greater than 1 mm, the strength of the side shell will be excessive, and a thick wall will also be caused, which is very uneconomical. Therefore, the thickness of the side shell is set to be 0.2-1 mm, which not only meets the strength requirement of the cell shell, but also takes into account the requirement of thin wall of the shell, which is economical and practical.
[0009] Preferably, the width of the splice joint is greater than 0 and not more than 0.5 times the thickness of the side shell.
[0010] In the scheme, when the width of the splicing joint is greater than 0.5 times the thickness of the side shell, more molten gold needs to be accumulated in the splicing joint during welding, which can cause uneven welding and poor welding quality. Therefore, the width of the splicing joint is set to be greater than 0 and not greater than 0.5 times the thickness of the side shell, so that penetration welding can be performed by using a laser to improve the welding speed and quality.
[0011] Preferably, the cross section of the accommodating cavity is rectangular, and the splicing joint is located on the short side of the rectangle.
[0012] In the scheme, the cross section of the accommodating cavity is set to be rectangular, which is convenient for forming a square-shaped battery cell. A plurality of square-shaped battery cells are integrated and assembled into a battery cell assembly to improve the energy density. By setting the splicing joint on the short side of the square-shaped battery cell, the larger surface of the battery cell will not have a welding seam, ensuring the strength requirement of the battery cell shell.
[0013] 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 both welded and connected with the side shell.
[0014] In the scheme, the top cover and the bottom plate are welded on the openings at both ends of the side shell to form a complete steel shell. The steel shell can withstand a large pressure and is not easy to deform, so it has high strength.
[0015] 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 and connected with the side shell through the second welding seam metal.
[0016] In the scheme, the end of the side shell is clamped in the first clamping groove, and the two are welded and connected. This sealing method does not require a thick shell, and does not require a wide sealing edge and a folding edge, which reduces the volume of the shell and improves the limiting and fixing effect between the side shell and the top cover.
[0017] Preferably, the size of the second welding seam metal gradually decreases from the outside to the inside.
[0018] And / or, the width of the second welding seam metal is 1-5 times the thickness of the side shell.
[0019] And / or, the height of the second welding seam metal is greater than 0 and not greater than 0.5 mm.
[0020] And / or, the depth of the second welding seam metal is 1-2 times the thickness of the side shell.
[0021] In the present scheme, the size of the second weld metal gradually decreases from the outside to the inside, and on the basis of ensuring the connection strength, the second weld metal has little effect on the internal space of the side shell.
[0022] When the width of the second weld metal is less than 1 times the thickness of the side shell, a weak part is easily formed at the weld, and the connection strength of the weld cannot meet the strength requirement. When the width of the second weld metal is greater than 5 times the thickness of the side shell, a relatively wide weld is formed at the junction of the side shell and the top cover, which not only causes the strength of the weld to be excessive, but also forms an unsightly weld. Therefore, the width of the second weld metal is set to be 1-5 times the thickness of the side shell, which can not only ensure the connection strength requirement, but also obtain a beautiful weld.
[0023] When the height of the second weld metal is greater than 0.5 mm, the surface of the side shell will protrude outward, and the welding strength will also be excessive. Therefore, the height of the second weld metal is set to be greater than 0 and less than 0.5 mm, which not only meets the strength requirement of the weld, but also makes the weld look simple and beautiful.
[0024] Since the second weld metal is located at the corner of the battery cell shell, when the depth of the second weld metal is less than 1 times the thickness of the side shell, the strength requirement cannot be met. When the depth of the second weld metal is greater than 2 times the thickness of the side shell, the second weld metal will protrude from the inner wall of the side shell and occupy the space of the accommodating cavity. Therefore, the depth of the second weld metal is set to be 1-2 times the thickness of the side shell, which ensures the connection strength requirement and does not occupy the internal space of the side shell. In summary, the second weld metal with the above parameter settings has a small volume of weld protrusion outside the weld, moderate connection strength, good quality, no weld protrusion inside the splicing joint, and does not occupy the space of the accommodating cavity of the side shell, so as to improve the energy density of the battery cell.
[0025] Preferably, the bottom plate is recessed inward toward the surface edge of the side shell 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 weld between the bottom plate and the side shell is a third weld metal, and the bottom plate is welded and connected with the side shell through the third weld metal.
[0026] In the present scheme, the end of the side shell is clamped in the second clamping groove, and the two are welded and connected. This sealing method does not require a thick side shell and a wide sealing edge and folding edge, reduces the volume of the side shell, and improves the limiting and fixing effect between the side shell and the bottom plate.
[0027] Preferably, the size of the third weld metal gradually decreases from the outside to the inside.
[0028] And / or, the width of the third weld metal is 1-5 times the thickness of the side shell.
[0029] and / or, the third weld metal has a height ranging from greater than 0 to no more than 0.5 mm;
[0030] and / or, the third weld metal has a depth ranging from 1 to 2 times the thickness of the side shell.
[0031] In the present solution, the size of the third weld metal gradually decreases from outside to inside, and on the basis of ensuring the connection strength, the third weld metal has a small influence on the internal space of the side shell.
[0032] When the width of the third weld metal is less than 1 times the thickness of the side shell, a weak part is easily formed at the weld, and the connection strength of the weld cannot meet the strength requirement. When the width of the third weld metal is greater than 5 times the thickness of the side shell, a wide weld is formed at the joint of the side shell and the top cover, which not only causes an overfitting of the strength at the weld, but also forms an unattractive weld. Therefore, the width of the third weld metal is set to range from 1 to 5 times the thickness of the side shell, which can not only ensure the connection strength requirement, but also obtain an attractive weld.
[0033] When the height of the third weld metal is greater than 0.5 mm, the surface of the side shell will protrude outward, and the welding strength will also be overfitted. Therefore, the height of the third weld metal is set to range from greater than 0 to less than 0.5 mm, which can not only meet the strength requirement of the weld, but also make the weld look simple and attractive.
[0034] Since the third weld metal is located at the corner of the battery cell shell, when the depth of the third weld metal is less than 1 times the thickness of the side shell, the strength requirement cannot be met. When the depth of the third weld metal is greater than 2 times the thickness of the side shell, the third weld metal will protrude from the inner wall of the side shell and occupy the space of the accommodating cavity. Therefore, the depth of the third weld metal is set to range from 1 to 2 times the thickness of the side shell, which can not only ensure the connection strength requirement, but also will not occupy the internal space of the side shell. In summary, the third weld metal with the above parameter settings has a small volume of weld protrusion on the outside of the weld, a moderate connection strength, a good quality, no weld protrusion on the inside of the splicing seam, and will not occupy the space of the accommodating cavity of the side shell, so as to improve the energy density of the battery cell.
[0035] A battery cell, comprising the battery cell shell as described above.
[0036] On the basis of conforming to the 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.
[0037] 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 splicing joint and a containing cavity after being bent, is connected by the first welding seam metal at the splicing joint, has only one welding seam in the circumferential direction of the side shell, reduces the number of welding seams and welding process, improves the strength of the side shell, and gradually reduces the size of the first welding seam metal from outside to inside, ensures the strength of the welding seam, and makes the first welding seam metal have little influence on the internal space of the side shell; when the width of the first welding seam metal is less than 1 times the thickness of the side shell, it is easy to form a weak part at the splicing joint, and cannot meet the connection strength requirement, when the width of the first welding seam metal is greater than 5 times the thickness of the side shell, a wide welding seam is formed on the side shell, which not only causes the strength of the splicing joint to be excessive, but also forms an unattractive welding seam, therefore, the width range of the first welding seam metal is set to 1-5 times the thickness of the side shell, which can not only ensure the connection strength requirement, but also obtain an attractive welding seam; when the height of the first welding seam metal is greater than 0.2mm, it will protrude outward from the surface of the side shell, and the welding strength will also be excessive, therefore, the height range of the first welding seam metal is set to greater than 0 and less than 0.2mm, which not only meets the strength requirement of the welding seam, but also makes the welding seam and the side shell look simple and attractive; when the depth of the first welding seam metal is less than 0.5 times the thickness of the side shell, the welding strength at the splicing joint cannot meet the connection strength requirement, and when the depth of the first welding seam metal is greater than 1 times the thickness of the side shell, the first welding seam metal will protrude from the inner wall of the side shell and occupy the space of the containing cavity, therefore, the depth range of the first welding seam metal is set to 0.5-1 times the thickness of the side shell, which ensures the connection strength requirement and does not occupy the internal space of the side shell; in summary, the first welding seam metal with the above parameters makes the welding bump outside the splicing joint small in volume, moderate in connection strength and good in quality, there is no welding bump inside the splicing joint, and the containing cavity space of the side shell is not occupied, so as to improve the energy density of the battery cell. BRIEF DESCRIPTION OF DRAWINGS
[0038] Figure 1 Structure diagram of the battery cell shell of a preferred embodiment of the utility model Figure 1 .
[0039] Figure 2 Explosion of the battery cell shell of a preferred embodiment of the utility model Figure 2 .
[0040] Figure 3 Cross section of the battery cell shell of a preferred embodiment of the utility model Figure 3 .
[0041] Figure 4 Enlarged view of part A in the figure Figure 3 .
[0042] Figure 5Structure diagram of the electric core shell of a preferred embodiment of the present utility model Figure 4 .
[0043] Figure 6 For Figure 5 The cross-sectional view along line B-B in the middle.
[0044] Figure 7 For Figure 6 The enlarged view of part C in the middle.
[0045] Figure 8 For Figure 6 The enlarged view of part D in the middle.
[0046] Explanation of reference signs:
[0047] Side shell 1
[0048] Splicing joint 11
[0049] First weld metal 12
[0050] Width of first weld metal 13
[0051] Height of first weld metal 14
[0052] Depth of first weld metal 15
[0053] Receiving cavity 16
[0054] Top cover 2
[0055] First clamping slot 21
[0056] Second weld metal 22
[0057] Width of second weld metal 23
[0058] Height of second weld metal 24
[0059] Depth of second weld metal 25
[0060] Bottom plate 3
[0061] Second clamping slot 31
[0062] Third weld metal 32
[0063] Width of third weld metal 33
[0064] Height of third weld metal 34
[0065] Depth of third weld metal 35
[0066] Direction from outside to inside 100 Specific implementation
[0067] The utility model will be more clearly and completely illustrated by the way of examples and in connection with the drawings, but the utility model is not limited in the scope of the examples.
[0068] As Figures 1-8 shown, the utility model discloses an electric core shell, the material quality of electric core shell is steel, and the electric core shell includes side shell 1, the first end of side shell 1 is bent along the circumference and forms the splicing seam 11 and the accommodating cavity 16 of two end openings with the second end of side shell 1, and the first end and the second end are welded and connected.The fusion metal at splicing seam 11 is first weld metal 12, and the size of first weld metal 12 gradually reduces in the direction 100 from outside to inside (the direction from the outside of side shell to the inside of side shell, as shown), and the width 13 of first weld metal 12 ranges from 1 to 5 times the thickness of side shell 1, the height 14 of first weld metal 12 ranges from more than 0 to not more than 0.2mm, and the depth 15 of first weld metal 12 ranges from 0.5 to 1 times the thickness of side shell 1. Figure 4
[0069] As Figures 1-4 shown, the electric core shell is steel material, can bear higher pressure, high strength, and is not easy to deform, and side shell 1 forms splicing seam 11 and accommodating cavity 16 after bending, is connected through first weld metal 12 at splicing seam 11, makes only one weld in the circumferential direction of side shell 1, reduces the number of weld and welding process, improves the strength of side shell 1, and the size of first weld metal 12 gradually reduces in the direction 100 from outside to inside, on the basis of ensuring the strength of weld, makes the influence of first weld metal 12 on the internal space of side shell 1 small.
[0070] As Figure 4 shown, when the width 13 of first weld metal 12 is less than 1 times the thickness of side shell 1, it is easy to form weak position at splicing seam 11, and cannot meet the requirement of connecting strength, when the width 13 of first weld metal 12 is greater than 5 times the thickness of side shell 1, it forms wide weld on side shell 1, which not only causes the strength excess at splicing seam 11, but also forms unattractive weld, therefore, the width 13 of first weld metal 12 is set to range from 1 to 5 times the thickness of side shell 1, which can not only ensure the requirement of connecting strength, but also obtain attractive weld.
[0071] As Figure 4 shown, when the height 14 of first weld metal 12 is greater than 0.2mm, it will protrude outward on the surface of side shell 1, and the welding strength will also appear excess, therefore, the height 14 of first weld metal 12 is set to range from more than 0 to less than 0.2mm, which not only meets the requirement of weld strength, but also makes the weld and side shell 1 look simple and attractive.
[0072] As Figure 4 As shown, when the depth 15 of the first weld metal 12 is less than 0.5 times the thickness of the side shell 1, the welding strength at the splicing joint 11 cannot meet the connection strength requirement, and when the depth 15 of the first weld metal 12 is greater than 1 times the thickness of the side shell 1, the first weld metal 12 will protrude from the inner wall of the side shell 1 and occupy the space of the accommodating cavity 16, so the depth 15 of the first weld metal 12 is set to be 0.5-1 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.
[0073] As can be seen, the first weld metal 12 with the above parameter setting has small welding bump volume on the outside of the splicing joint 11, moderate connection strength, good quality, no welding bump on the inside of the splicing joint 11, and does not occupy the space of the accommodating cavity 16 of the side shell 1, to improve the energy density of the battery cell.
[0074] In the embodiment, the thickness of the side shell 1 ranges from 0.2 to 1 mm. Since the material of the side shell 1 is steel, when the thickness of the side shell 1 is less than 0.2 mm, the side shell 1 is thin and easy to deform and break, and when the thickness of the side shell 1 is greater than 1 mm, the strength of the side shell 1 will be excessive and the wall thickness will also be caused, which is very uneconomical, so the thickness of the side shell 1 is set to be between 0.2 and 1 mm, to meet the strength requirement of the battery cell shell and also take into account the requirement of thin shell wall, which is economical and practical.
[0075] As shown in Figure 4 , the width of the splicing joint 11 ranges from greater than 0 to not greater than 0.5 times the thickness of the side shell 1. When the width of the splicing joint 11 is greater than 0.5 times the thickness of the side shell 1, more molten metal needs to be accumulated for the splicing joint 11 during welding, which will cause uneven weld and poor weld quality, so the width of the splicing joint 11 is set to be greater than 0 and not greater than 0.5 times the thickness of the side shell 1, to facilitate penetration welding by laser, to improve the welding speed and quality.
[0076] As shown in Figures 1-3 , the cross section of the accommodating cavity 16 is rectangular, and the splicing joint 11 is located on the short side of the rectangle. The cross section of the accommodating cavity 16 is set to be rectangular, to facilitate 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 joint 11 on the short side of the square battery cell, the larger surface of the battery cell will not have a weld, to ensure the strength requirement of the battery cell.
[0077] As shown in Figure 1 and Figure 2 , the battery cell shell further includes a top cover 2 and a bottom plate 3, the top cover 2 and the bottom plate 3 are respectively installed and sealed on two openings, and the top cover 2 and the bottom plate 3 are both welded and connected with the side shell 1. By welding the top cover 2 and the bottom plate 3 on the openings at both ends of the side shell 1, a complete steel shell is formed, which can withstand a large pressure and is not easy to deform, with high strength.
[0078] As shown in Figure 2 , Figure 6 and Figure 7 , the top cover 2 is inwardly recessed towards the surface edge of the side shell 1 to form an annular first clamping groove 21, the end of the side shell 1 is clamped and welded in the first clamping groove 21, the molten metal at the weld joint of the top cover 2 and the side shell 1 is a second weld metal 22, and the top cover 2 is welded and connected with the side shell 1 through the second weld metal 22. By clamping one end of the side shell 1 in the first clamping groove 21 and welding and connecting them, this sealing method does not require a thicker side shell 1 and does not require a wider sealing edge and a folding edge, reducing the volume of the side shell 1 and also improving the limiting and fixing effect between the side shell 1 and the top cover 2.
[0079] As shown in Figure 7 , the size of the second weld metal 22 gradually decreases in the direction 100 from the outside to the inside; and / or, the width 23 of the second weld metal 22 ranges from 1 to 5 times the thickness of the side shell 1; and / or, the height 24 of the second weld metal 22 ranges from greater than 0 to not more than 0.5 mm; and / or, the depth 25 of the second weld metal 22 ranges from 1 to 2 times the thickness of the side shell 1.
[0080] As shown in Figure 7 , the size of the second weld metal 22 gradually decreases in the direction 100 from the outside to the inside. By gradually reducing the size of the second weld metal 22 in the direction 100 from the outside to the inside, the influence of the second weld metal 22 on the internal space of the side shell 1 is small on the basis of ensuring the connection strength.
[0081] As shown in Figure 7 , the width 23 of the second weld metal 22 ranges from 1 to 5 times the thickness of the side shell 1. When the width 23 of the second weld metal 22 is less than 1 times the thickness of the side shell 1, a weak part is easily formed at the weld, and the connection strength of the weld cannot meet the strength requirement. When the width 23 of the second weld metal 22 is greater than 5 times the thickness of the side shell 1, a wider weld is formed at the joint of the side shell 1 and the top cover 2, which not only causes an excess of strength at the weld, but also forms an unsightly weld. Therefore, the width 23 of the second weld metal 22 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 aesthetically pleasing weld.
[0082] As shown in Figure 7 , the height 24 of the second weld metal 22 ranges from greater than 0 to not more than 0.5 mm. When the height 24 of the second weld metal 22 is greater than 0.5 mm, the surface of the side shell 1 will protrude outward, and the welding strength will also be excessive. Therefore, the height 24 of the second weld metal 22 is set to range from greater than 0 to not more than 0.5 mm, which not only meets the strength requirement of the weld, but also makes the weld look simple and beautiful.
[0083] As shown in Figure 7 , the depth 25 of the second weld metal 22 ranges from 1 to 2 times the thickness of the side shell 1. Since the second weld metal 22 is located at the corner of the cell shell, when the depth 25 of the second weld metal 22 is less than 1 times the thickness of the side shell 1, the strength requirement cannot be met, and when the depth 25 of the second weld metal 22 is greater than 2 times the thickness of the side shell 1, the second weld metal 22 will protrude from the inner wall of the side shell 1 and occupy the space of the containing cavity 16, so the depth 25 of the second weld metal 22 is set to range from 1 to 2 times the thickness of the side shell 1, which ensures the connection strength requirement and does not occupy the internal space of the side shell 1.
[0084] Therefore, the second weld metal 22 with the above parameter setting has small weld nugget volume on the outside of the weld, moderate connection strength, good quality, no weld nugget on the inside of the splice joint 11, and does not occupy the containing cavity 16 space of the side shell 1, so as to improve the energy density of the cell.
[0085] As shown in Figure 2 , Figure 6 and Figure 8 , the surface edge of the bottom plate 3 facing the side shell 1 is inwardly recessed to form an annular second clamping groove 31, and the end of the side shell 1 is clamped and welded in the second clamping groove 31, the molten metal at the weld between the bottom plate 3 and the side shell 1 is a third weld metal 32, and the bottom plate 3 is welded and connected with the side shell 1 through the third weld metal 32. By clamping one end of the side shell 1 in the second clamping groove 31 and welding and connecting them, this sealing method does not require a thick shell, and does not require a wide sealing edge and a folding edge, reducing the volume of the shell, and also improving the limiting and fixing effect between the side shell 1 and the bottom plate 3.
[0086] As shown in Figure 8 , the size of the third weld metal 32 gradually decreases in the direction 100 from the outside to the inside; and / or, the width 33 of the third weld metal 32 ranges from 1 to 5 times the thickness of the side shell 1; and / or, the height 34 of the third weld metal 32 ranges from greater than 0 to not greater than 0.5 mm; and / or, the depth 35 of the third weld metal 32 ranges from 1 to 2 times the thickness of the side shell 1.
[0087] As shown in Figure 8 , the size of the third weld metal 32 gradually decreases in the direction 100 from the outside to the inside. Gradually reducing the size of the third weld metal 32 in the direction 100 from the outside to the inside ensures the connection strength and makes the third weld metal 32 have little effect on the internal space of the side shell 1.
[0088] As shown in Figure 8As shown, the width 33 of the third weld metal 32 ranges from 1 to 5 times the thickness of the side shell 1. When the width 33 of the third weld metal 32 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 33 of the third weld metal 32 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 2, which will cause both overstretching at the weld and an unsightly weld. Therefore, setting the width 33 of the third weld metal 32 to 1 to 5 times the thickness of the side shell 1 can ensure the connection strength requirements and obtain an aesthetically pleasing weld.
[0089] like Figure 8 As shown, the height 34 of the third weld metal 32 is greater than 0 and not greater than 0.5 mm. When the height 34 of the third weld metal 32 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 34 of the third weld metal 32 to be greater than 0 and less than 0.5 mm satisfies the strength requirements of the weld and makes the weld look simple and beautiful.
[0090] like Figure 6 and Figure 8 As shown, the depth 35 of the third weld metal 32 ranges from 1 to 2 times the thickness of the side shell 1. Since the third weld metal 32 is located at the corner of the cell casing, if the depth 35 of the third weld metal 32 is less than 1 times the thickness of the side shell 1, the strength requirement cannot be met. If the depth 35 of the third weld metal 32 is greater than 2 times the thickness of the side shell 1, the third weld metal 32 will protrude from the inner wall of the side shell 1 and occupy the space of the receiving cavity 16. Therefore, setting the depth 35 of the third weld metal 32 to 1 to 2 times the thickness of the side shell 1 ensures the connection strength requirement without occupying the internal space of the side shell 1. In summary, the third weld metal 32 with the above parameter settings results in a small weld bead volume on the outer side of the weld, moderate connection strength, and good quality. There are no weld beads on the inner side of the splice seam 11, and it does not occupy the space of the receiving cavity 16 of the side shell 1, thereby improving the energy density of the cell.
[0091] This embodiment also discloses a battery cell, which includes a battery cell casing as described above.
[0092] In the description herein, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0093] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application 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 present application, but these changes and modifications all fall within the protection scope of the present application.
Claims
1. An electric cell housing made of steel, characterized in that, The shell comprises a side shell, a first end of the side shell is bent in a circumferential direction to form a splice joint and a two-end opening accommodating cavity with a second end of the side shell, the first end and the second end are welded, the fused metal at the splice joint is a first weld metal, the size of the first weld metal gradually decreases from outside to inside, the width of the first weld metal ranges from 1 to 5 times the thickness of the side shell, the height of the first weld metal ranges from greater than 0 to not greater than 0.2 mm, and the depth of the first weld metal ranges from 0.5 to 1 times the thickness of the side shell.
2. The cell housing of claim 1, wherein, The thickness of the side shell ranges from 0.2 to 1 mm.
3. The cell housing of claim 1, wherein, The width of the splice joint ranges from greater than 0 to not greater than 0.5 times the thickness of the side shell.
4. The cell housing of claim 1, wherein, The cross section of the accommodating cavity is a rectangle, and the splice joint is located on the short side of the rectangle.
5. The cell housing of claim 1, wherein, The shell further comprises a top cover and a bottom plate, the top cover and the bottom plate are respectively installed and sealed with the two openings, and the top cover and the bottom plate are both welded with the side shell.
6. The cell housing of claim 5, wherein, 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 fused metal at the weld joint of the top cover and the side shell is a second weld metal, and the top cover is welded with the side shell through the second weld metal.
7. The cell housing of claim 6, wherein, The size of the second weld metal gradually decreases from outside to inside; and / or, the width of the second weld metal ranges from 1 to 5 times the thickness of the side shell; and / or, the height of the second weld metal ranges from greater than 0 to not greater than 0.5 mm; and / or, the depth of the second weld metal ranges from 1 to 2 times the thickness of the side shell.
8. The cell housing of claim 5, wherein, 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 fused metal at the weld joint of the bottom plate and the side shell is a third weld metal, and the bottom plate is welded with the side shell through the third weld metal.
9. The cell housing of claim 8, wherein, The size of the third weld metal gradually decreases from outside to inside; and / or, the width of the third weld metal ranges from 1 to 5 times the thickness of the side shell; and / or, the height of the third weld metal ranges from greater than 0 to not greater than 0.5 mm; and / or, the depth of the third weld metal ranges from 1 to 2 times the thickness of the side shell.
10. An electric cell characterized by The battery cell comprises the battery cell shell according to any one of claims 1-9.