CN117691269A - Battery core - Google Patents
Battery core Download PDFInfo
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- CN117691269A CN117691269A CN202410129583.1A CN202410129583A CN117691269A CN 117691269 A CN117691269 A CN 117691269A CN 202410129583 A CN202410129583 A CN 202410129583A CN 117691269 A CN117691269 A CN 117691269A
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- cover plate
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- 230000035515 penetration Effects 0.000 claims abstract description 9
- 210000001503 joint Anatomy 0.000 claims description 52
- 230000007704 transition Effects 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 88
- 239000011324 bead Substances 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 16
- 238000013461 design Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 229910052734 helium Inorganic materials 0.000 description 6
- 239000001307 helium Substances 0.000 description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to the technical field of batteries, and particularly discloses a battery cell, wherein at least one end of a battery cell shell is provided with an opening, the inner wall surface of the battery cell shell comprises an embedding section positioned at one side close to the opening, the embedding section is welded with a body of a cover plate, the depth of the embedding section is d, and the thickness L2 of the body is as follows: by adopting the assembly dimensional relationship, the L2-0.5 is less than or equal to d is less than or equal to L2+0.5, so that the degree of fit between the body and the battery cell shell is higher, the end face of one side of the body, which is away from the battery cell shell, is kept flush with the end part of the battery cell shell, the problems of hole explosion and cold joint are not easy to occur, and the welding strength and the welding yield are higher. Meanwhile, the value range of L2 is controlled to be more than or equal to 0.5mm, so that the penetration is enough during welding, the beads are not easy to generate, the welding quality is further ensured, and meanwhile, the beads are prevented from falling on the pole group to burn the pole group.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cell.
Background
Currently, the cells generally comprise an internal structure, which mainly comprises a pole group, and an external structure, which mainly comprises a cover plate and a cell housing. The battery cell shell provides an accommodating space for the pole group, and the cover plate and the battery cell shell are matched through welding to form a closed space, so that the complete battery cell is assembled. The battery cell casing adopts continuous stamping stretch forming generally, and one side of battery cell casing is equipped with the opening, installs the electrode group in the inside back of battery cell casing through the opening, opening and apron welded fit to the apron can shutoff opening, then utilizes laser to carry out gap welding's mode with apron welding in the opening part of battery cell casing, realizes the seal between apron and the battery cell casing.
However, in the above-mentioned sealed welding mode, because the fit size and structure of the battery cell casing and the cover plate are not constrained, the welding connection between the cover plate and the battery cell casing is not firm enough, the welding yield is low, the welding gap between the cover plate and the battery cell casing is easy to crack and break, the production cost is increased, and the production efficiency is reduced. Especially when the battery cell produces gas in the charge-discharge process, the internal atmospheric pressure of battery cell casing can form shearing force in welding gap department, and the welding seam is easy fracture, and the leakproofness is not good leads to the battery cell to appear leaking the liquid condition, and the battery cell inefficacy, serious even emergence incident.
Disclosure of Invention
The invention aims to provide a battery cell, which has higher matching degree between a battery cell shell and a cover plate, is beneficial to improving the welding strength and the welding yield of the battery cell shell and the cover plate, and ensures the sealing performance after welding and has higher safety.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a battery cell, comprising:
the battery cell comprises a battery cell shell, wherein at least one end of the battery cell shell is provided with an opening, and the inner wall surface of the battery cell shell comprises an embedding section, a shielding section and a pole group accommodating section;
the cover plate comprises a body embedded in the opening, four corners of the body are in interference fit with the scarf joint section, the rest part of the body is in clearance fit with the scarf joint section, and the body is in welded connection with the scarf joint section;
when the cover plate is assembled with the battery cell shell, the depth of the scarf joint section is d, and the thickness L2 of the body meets the following conditions: l2-0.5 is less than or equal to d and less than or equal to L2+0.5, and L2 is more than or equal to 0.5mm.
Optionally, the wall thickness of the scarf section is a, and the wall thickness a of the scarf section satisfies: a is more than or equal to 0.3mm and less than or equal to 1mm.
Optionally, the wall thickness of the pole group accommodating section is f, the shielding section is provided with an inclined step surface, the width of the projection of the step surface on the cover plate along the height direction of the battery cell shell is c, a first joint is arranged between the scarf joint section and the body, and the width of the first joint is b;
wherein, c is more than or equal to 2b and less than or equal to 0.5mm;
the width b of the first seam satisfies: b is more than or equal to 0 and less than or equal to 0.2.
Optionally, the battery cell casing includes two first side plates and two second side plates, the first side plates are connected with the second side plates in sequence, the same ends of the first side plates and the second side plates are surrounded to form the opening, the body includes a first side edge and a second side edge, the first joint is arranged between the first side plates and the first side edge, the second joint is arranged between the second side plates and the second side edge, and the width of the second joint is g;
the width g of the second seam satisfies: g is more than or equal to 0 and less than or equal to 0.5mm.
Optionally, the first side plate includes scarf joint section, shielding section and the utmost point group section of holding that arranges in proper order, scarf joint section is located be close to on the internal face of first side plate open one end.
Optionally, the first side plate and the second side plate are connected through a fillet in transition, and the radius of the fillet is R1;
the first side edge and the second side edge are in transitional connection through a bullnose, and the radius of the bullnose is R2;
wherein the radius R1 of the fillet satisfies: r1 is more than or equal to 1.5mm and less than or equal to 5mm;
the radius R2 of the bullnose satisfies: R1-R2 is more than or equal to 0 and less than or equal to 0.5mm.
Optionally, a boss is further arranged on one side of the body, facing the battery cell shell, and a guiding part is arranged on the periphery of the boss, and the boss extends into the battery cell shell from the opening;
wherein the thickness of the cover plate is L1, the thickness of the boss is L3, l1=l2+l3;
the thickness L1 of the cover plate meets the following conditions: l1 is more than or equal to 0.7mm and less than or equal to 5mm;
the thickness L3 of the boss satisfies the following conditions: l3 is more than or equal to 0.2mm.
Optionally, the guiding part is a chamfer surface matched with the step surface, and an included angle x is formed between the step surface and the extension surface of the scarf joint section;
the body comprises an outer end face and a side face, the side face is positioned in the circumferential direction of the outer end face and connected with the outer end face, the side face is matched with the scarf joint section, an included angle z is formed between the chamfer face and an extension face of the side face, and the included angle z is larger than or equal to the included angle x;
wherein, contained angle x satisfies: x is more than or equal to 30 degrees;
the included angle z satisfies the following conditions: z is less than or equal to 60 degrees.
Optionally, the welding width of the body and the scarf joint section is w, and the welding depth is h;
wherein, the width of fusion w satisfies: w is more than or equal to 0.6mm;
the penetration h satisfies: h is more than or equal to 0.5mm and less than or equal to 1.0mm.
Optionally, the battery cell further includes a pole group, and the pole group is disposed inside the battery cell housing.
The beneficial effects of the invention are as follows:
the invention provides a battery cell, which comprises a battery cell shell and a cover plate, wherein at least one end of the battery cell shell is provided with an opening, and the inner wall surface of the battery cell shell comprises an scarf joint section, a shielding section and a pole group accommodating section which are sequentially arranged. The scarf joint section is located and is close to open one side, scarf joint section and the body welded connection of apron, and the shielding section can avoid laser to go into in the electric core casing when the welding, and the utmost point group holds the section and is used for the holding utmost point group. Under the assembled state of the cover plate and the battery cell shell, the depth of the scarf joint section is d, and the thickness L2 of the body meets the following conditions: by adopting the assembly dimensional relation, the L2-0.5 d is less than or equal to L2+0.5, so that the degree of fit between the body of the cover plate and the battery cell shell is higher, after the body of the cover plate is put into the shell, the end face of one side of the body, which is far away from the installation space, cannot be higher than the end part of the battery cell shell, and meanwhile, the size of the body, which is sunk into the battery cell shell, cannot be too large, so that good welding quality is ensured, the problems of hole explosion and cold welding are not easy to occur, and the welding strength and the welding yield are higher. Meanwhile, the value range of L2 is controlled to be more than or equal to 0.5mm, so that the penetration is enough during welding, the beads are not easy to generate, the welding quality is further ensured, and meanwhile, the beads are prevented from falling on the pole group to burn the pole group.
Drawings
Fig. 1 is a top view of a battery cell provided in an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a cross-sectional view of section B-B of FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 3 at C;
FIG. 5 is a cross-sectional view of section D-D of FIG. 3;
FIG. 6 is an enlarged view of a portion of FIG. 5 at E;
FIG. 7 is an exploded view of a cell provided in an embodiment of the present invention;
fig. 8 is an enlarged view of a metallographic structure (reject) of a welded seam position of a battery cell housing and a cover plate after welding, provided in an embodiment of the present invention;
fig. 9 is a second enlarged view (qualified product) of a metallographic structure of a welded seam position of the battery cell housing and the cover plate after welding in the embodiment of the invention.
In the figure:
10. a bead;
100. a cell housing; 110. a first side plate; 111. a scarf joint section; 112. a shielding section; 113. a pole group receiving section; 120. a second side plate; 130. a fillet;
200. a cover plate; 210. a body; 211. a first side; 212. a second side; 213. a bullnose; 220. a boss; 221. a guide part;
300. a pole group.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The embodiment provides a battery cell, as shown in fig. 1-4, the battery cell includes a battery cell housing 100 and a cover plate 200, the degree of fit between the battery cell housing 100 and the cover plate 200 is high, the welding strength and the welding yield are high, and the sealing performance is good after the battery cell housing 100 and the cover plate 200 are welded.
Wherein, at least one end of electric core casing 100 forms spacedly, and the internal face of electric core casing 100 includes scarf joint section 111, shelters from section 112 and utmost point group and holds section 113, and wherein, scarf joint section 111 is located and is close to spacedly one side, and utmost point group holds section 113 and encloses to establish the installation space that forms and place utmost point group 300 for utmost point group 300 can pass spacedly and enter into the installation space in the electric core casing 100, plays the effect of holding utmost point group 300, shelters from section 112 and is located between scarf joint section 111 and the utmost point group and hold section 113. The cover plate 200 includes a body 210, the body 210 is embedded in the opening of the cell housing 100, four corners of the body 210 are in interference fit with the scarf joint section 111, so that when the cover plate 200 is assembled with the cell housing 100, the cover plate 200 can be supported at the opening and cannot fall into an installation space, the rest of the body 210 is in clearance fit with the scarf joint section 111, and then the body 210 is connected with the scarf joint section 111 (at one end at the opening) through welding. And laser welding is adopted between the battery cell casing 100 and the cover plate 200. By providing the shielding section 112, laser light is prevented from being incident into the installation space during welding, and the electrode group 300 is prevented from being burned.
Further, in the assembled state of the cover 200 and the cell case 100, the depth of the scarf section 111 is d, that is, the distance between the end of the shielding section 112 near the scarf section 111 and the opening of the cell case 100 is d, and the thickness L2 of the body 210 satisfies: by adopting the assembly dimensional relationship, L2-0.5 is less than or equal to d is less than or equal to L2+0.5, so that the degree of fit between the body 210 of the cover plate 200 and the battery cell housing 100 is higher, after the body 210 of the cover plate 200 is put into the housing, the end face of one side of the body 210, which is far away from the installation space, cannot be higher than the end part of the battery cell housing 100, and meanwhile, the size of the body 210, which is immersed into the battery cell housing 100, cannot be too large, so that good welding quality is ensured, the problems of hole explosion and cold welding are not easy to occur, and the welding strength and the welding yield are higher. And the value range of L2 is controlled to be more than or equal to 0.5mm, so that the penetration is enough during welding, the molten beads 10 are not easy to generate, the welding quality is further ensured, and meanwhile, the molten beads 10 are prevented from falling on the pole group 300 to burn the pole group 300 (see fig. 8 and 9). Illustratively, L2 may take on values of 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, and so forth.
Further, in this embodiment, the wall thickness of the scarf section 111 is a, and the wall thickness a of the scarf section 111 satisfies: a is more than or equal to 0.3mm and less than or equal to 1mm. Thereby ensuring that the wall thickness of the scarf joint 111 is within a proper range, the wall thickness of the scarf joint 111 is not excessively large, and the weight reduction and the material saving are facilitated; meanwhile, the wall thickness of the scarf joint section 111 is not too small, so that the melting width is too small, and the welding quality is affected. Illustratively, a may have a value of 0.3mm, 0.6mm, 0.8mm, 1.0mm, and so forth.
It should be noted that, after the body 210 of the cover plate 200 is welded with the scarf joint section 111 of the cell housing 100, the melting width is w, the penetration is h (see fig. 9), and the melting width w satisfies: w is more than or equal to 0.6mm; the penetration h satisfies: h is more than or equal to 0.5mm and less than or equal to 1.0mm. Therefore, the welding seam is ensured to have enough melting width and penetration, the welding strength and welding quality are higher, the sealing performance is good after the cover plate 200 and the battery cell shell 100 are welded, and the leakage is not easy to occur.
Further, in the present embodiment, the wall thickness of the pole group accommodating section 113 of the battery cell housing 100 is f, the shielding section 112 has an inclined step surface, the width of the projection of the step surface on the cover 200 along the height direction of the battery cell housing 100 is c, a first joint is provided between the scarf joint section 111 and the body 210, and the width of the first joint is b. The width b of the first seam needs to satisfy: 2 b.ltoreq.c.ltoreq.0.5 mm to avoid laser leakage from the first joint into the installation space of the cell housing 100 due to the bias to one side when the cover 200 is assembled.
With continued reference to fig. 1 and 2, in this embodiment, the battery cell casing 100 includes two first side plates 110 disposed opposite to each other and two second side plates 120 disposed opposite to each other, where the first side plates 110 are sequentially connected to the second side plates 120, and the same ends of the two first side plates 110 and the two second side plates 120 are surrounded to form the opening. In this embodiment, only one side of the battery cell casing 100 is provided with an opening, that is, one ends of the first side plate 110 and the second side plate 120 of the battery cell casing 100 facing away from the opening are connected with a bottom plate, so that the first side plate 110, the second side plate 120 and the bottom plate together enclose an installation space for placing the pole group 300. Optionally, the area of the first side plate 110 is smaller than the area of the second side plate 120, i.e. the second side plate 120 is a large surface of the cell housing 100.
It should be noted that, referring to fig. 5 and 6, the inner wall surface of the first side plate 110 in this embodiment includes an engagement section 111, a shielding section 112 and a pole group accommodating section 113 which are sequentially arranged, and the engagement section 111 is located at an end of the inner wall surface of the first side plate 110 near the opening. The inner wall surface of the second side plate 120 is a plane, the second side plate 120 is not provided with a shielding section 112, the wall thickness of the second side plate 120 is equal to the wall thickness of the embedding section 111 of the first side plate 110, that is, the wall thickness of the second side plate 120 is equal to a, and a is more than or equal to 0.3mm and less than or equal to 1mm. By this arrangement, the overall weight of the cell housing 100 can be reduced and material can be saved.
With continued reference to fig. 2, the body 210 includes a first side edge 211 and a second side edge 212, the first side panel 110 and the first side edge 211 form a first seam therebetween, and the second side panel 120 and the second side edge 212 have a second seam therebetween, wherein the width of the first seam is b, and the width of the second seam is g. It should be noted that the width g of the second seam satisfies: g is more than or equal to 0 and less than or equal to 0.5mm, and the assembly gap is smaller. When the body 210 of the cover plate 200 is installed in the opening of the battery cell case 100 for welding, the second side 212 of the body 210 and the second side plate 120 of the battery cell case 100 can be clamped by using the clamping fixture, so that the second joint g is zeroed, and laser leakage into the burn-in electrode group 300 during welding is prevented. Wherein the clamping tool is a common tool in the prior art, and is not described herein. Illustratively, g may take on values of 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, and so forth.
Further, in order to ensure that the laser light at the first side plate 110 does not leak in, the width b of the first seam in this embodiment needs to satisfy: c is more than or equal to 2b and less than or equal to 0.5mm. At this time, even if an extreme case that the cover 200 is biased to one side occurs when the battery cell case 100 is assembled with the cover 200, the laser light can be blocked by the step surface of the shielding section 112 of the inner wall surface of the first side plate 110, and the laser light does not leak into the battery cell case 100, so that the electrode group 300 is not damaged. The extreme case that the cover 200 is biased to one side is that no gap exists between the body 210 of the cover 200 and the scarf joint section 111 of the first side plate 110 on one side, and the body 210 of the cover 200 has a fit gap with the scarf joint section 111 of the first side plate 110 on the other side, so that it is required to ensure that c is not less than 2b to prevent the laser from being blocked by the shielding section 112 and not leaking in the welding process. Of course, it is also preferable that the value of c is not excessive, and if the value of c is excessive, the wall thickness f of the pole group accommodation section 113 of the first side plate 110 is excessive, wasting material and cost. For this reason, the width b of the first seam in this embodiment satisfies: b is more than or equal to 0 and less than or equal to 0.2, and in the value range, the cover plate 200 and the battery cell shell 100 can be conveniently assembled, and meanwhile, the problem that laser leaks into the electrode group 300 in the shell due to overlarge first joint can be avoided. Illustratively, b may take on values of 0mm, 0.1mm, 0.2mm, etc. The value of c may be 0mm, 0.2mm, 0.25mm, 0.3mm, 0.4mm, etc.
Optionally, in this embodiment, the first side plate 110 and the second side plate 120 of the cell housing 100 are connected by a fillet 130. The first side 211 and the second side 212 of the body 210 are connected by a bullnose 213. It should be noted that the shielding section 112 is only disposed on the inner wall surface of the first side plate 110 of the cell housing 100, and the inner wall surface of the second side plate 120 is not provided, the fillet 130 is used as a transition surface between the first side plate 110 and the second side plate 120, and the shielding section 112 is smaller in size, so that the value of the width b of the first seam needs to be smaller (0.ltoreq.b.ltoreq.0.2), so as to avoid laser leakage caused by overlarge gap.
Further, in order to make the cover plate 200 fit with the cell housing 100, the cover plate 200 does not fall into the cell housing 100, and in this embodiment, the fillets 130 and 213 are in interference fit or small clearance fit, so that four corners of the body 210 of the cover plate 200 can be supported at four corners of the cell housing 100, that is, the fillets 213 are supported at the fillets 130 where the first side plate 110 and the second side plate 120 are in transitional connection.
Specifically, in this embodiment, the radius of the fillet 130 is R1, and the radius of the bullnose 213 is R2. Wherein the radius R1 of fillet 130 satisfies: r1 is more than or equal to 1.5mm and less than or equal to 5mm; on the one hand, when the fillet 130 is too small, the welding track is prevented from being blocked at the matching position of the fillet 130 and the bullnose 213, and the welding is not smooth, so that the cold joint or the broken joint is caused; on the other hand, when the fillet 130 is excessively large, it is avoided that the installation space of the cell case 100 is wasted and the electrode group 300 is easily crushed. By adopting the value range, the welding quality of the matching position of the fillet 130 and the bullnose 213 is ensured to be good, the welding strength is higher, and the sealing property of the welding position is ensured to be good. Illustratively, R1 may take on values of 1.5mm, 1.8mm, 2.0mm, 2.5mm, 3mm, 4mm, 5mm, and so forth.
The radius R2 of the bullnose 213 satisfies: R1-R2 is more than or equal to 0 and less than or equal to 0.5mm. By the arrangement, when the body 210 of the cover plate 200 is assembled with the cell housing 100, the body 210 of the cover plate 200 is located at the middle position of the opening of the cell housing 100, namely, the sizes of the first joints b between the two first side edges 211 of the body 210 and the scarf joint sections 111 of the two first side plates 110 of the cell housing 100 are relatively close, the first joints on one side are prevented from being too large, the laser burn pole group 300 is prevented from being leaked easily during welding, and meanwhile, the gap between the matching position of the fillet 130 and the bullnose 213 is also prevented from being too large, so that laser is leaked into the cell housing 100.
With continued reference to fig. 4, in this embodiment, a boss 220 is further disposed on a side of the body 210 of the cover 200 facing the battery cell casing 100, the boss 220 has a guiding portion 221 circumferentially, and the boss 220 extends into the battery cell casing 100 from an opening. The cover plate 200 is conveniently installed in the opening of the cell housing 100 by the guide part 221 on the boss 220. The thickness of the cover plate 200 is L1, l1=l2+l3. The thickness L1 of the cover plate 200 satisfies: l1 is more than or equal to 0.7mm and less than or equal to 5mm; the thickness L3 of the boss 220 satisfies: l3 is more than or equal to 0.2mm. Through controlling the thickness L1 of the cover plate 200 and the thickness L3 of the boss 220 in the above range, the material consumption of the cover plate 200 can be reduced, the cost increase caused by the excessive thickness of the cover plate 200 is avoided, and the interference with the pole group 300 in the battery cell housing 100 when the thickness of the boss 220 on the cover plate 200 is excessive is avoided. Illustratively, L1 may have a value of 0.7mm, 1.0mm, 2.0mm, 2.5mm, 3mm, 4mm, 5mm, and so forth.
Further, in this embodiment, the step surface of the shielding section 112 is an inclined plane, and an included angle x is formed between the step surface of the shielding section 112 and the extension surface of the scarf joint section 111. The body 210 includes an outer end surface and a side surface, wherein the outer end surface is an end surface of the body 210 facing away from the side of the cell housing 100, the outer end surface is located outside the installation space of the cell housing 100, the side surface is located in the circumferential direction of the outer end surface and connected with the outer end surface, and the side surface is used for being matched with the scarf joint section 111 and welded and connected with the scarf joint section 111. The value range of the included angle x satisfies the following conditions: x is larger than or equal to 30 degrees, so as to increase the surface area of the step surface of the shielding section 112 facing one side of the cover plate 200, thereby being beneficial to shielding laser light from entering, and meanwhile, when one end (the end where the first side 211 is positioned) of the cover plate 200 continuously slides downwards into the cell housing 100 relative to the opening of the cell housing 100, the step surface of the shielding section 112 can be fully abutted with the cover plate 200, so that the cover plate 200 is supported, and the stability of the cell is improved. Illustratively, the included angle x may take the values of 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, and so on.
Further, the guiding portion 221 in the circumferential direction of the boss 220 is in a closed ring shape, the guiding portion 221 is a chamfer surface matched with the step surface of the shielding section 112, that is, the chamfer surface is also in a closed ring shape, an included angle z is formed between the chamfer surface and the extension surface of the side surface of the body 210, the included angle z is greater than or equal to the included angle x, and the included angle z satisfies: z is less than or equal to 60 degrees. Thus, interference between the boss 220 and the shielding section 112 of the cell housing 100 is avoided, and the chamfer surface can play a good guiding role when the cover plate 200 is assembled into the housing. Illustratively, the included angle z may take on values of 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, and so on.
It should be noted that, when the battery cell case 100 and the cover plate 200 are specifically assembled and welded, the body 210 of the cover plate 200 and the scarf section 111 of the battery cell case 100 are subjected to a pre-spot welding process before the welding process, so that the cover plate 200 can be fixed on the battery cell case 100 in advance. The pre-welding point will fix the height difference between the end surface of the cover plate 200 on the side far away from the installation space and the end part of the scarf joint section 111 of the cell shell 100, and the height difference between the end surface and the end surface is smaller under the condition that L2-0.5 is less than or equal to d2+0.5, so as to prepare for full-circle welding between the follow-up cover plate 200 and the cell shell 100, ensure that the compressive strength of the cell after full-circle welding is greater than 1.2Mpa and the welding point does not leak, the welding strength is higher, and in addition, the helium leak detection rate of the cell after full-circle welding is less than 1 x 10 -7 pa, ensuring good sealing.
In the following, test experiments were performed on the welding quality and the welding tightness of the battery cells in this embodiment. The battery cell casing 100 with the same size specification, the covers with different thicknesses, the bodies 210 with different thicknesses and the bosses 220 with different thicknesses are assembled, and then laser butt welding is performed. Specific dimensional specifications are shown in table 1 below:
the samples 2#, 5#, and 6# have L2, b, c, d, R1, and R2 within the required ranges of the above dimensions, and after the cover plate 200 and the cell casing 100 are welded by laser, no laser leaks into the cell casing 100, and the matching position between the cell casing 100 and the cover plate 200 has good welding quality, high welding strength, and the samples 2#, 5#, and 6# are all qualified;
comparing samples # 1, # 2, # 5 and # 6, except for the thickness l2=0.4 of the body 210 of sample # 1, which is not in the range of the dimension requirement l2 being larger than or equal to 0.5mm, the other b, c, d, R and R2 meet the design requirement, after the cover plate 200 and the cell housing 100 are welded by laser, the molten part forms a molten bead 10 (see fig. 8) due to the smaller dimension of L2, the compressive strength of the welded cell is lower than 1.2Mpa, even lower than 1.0Mpa, and the sample # 1 is unqualified;
comparing samples 2#, 3#, 5#, 6#, except that the height difference c=0.1 between the two ends of the shielding section 112 of sample 3#, is not within the range that the dimension requirement 2b is less than or equal to c is less than or equal to 0.5mm, and the rest L2, b, d, R1 and R2 all meet the range of the design requirement, after the cover plate 200 and the cell housing 100 are welded by laser, the situation of leaking in the laser occurs in the cell housing 100, the shielding section 112 cannot shield the laser, the electrode group 300 is burnt, and the sample 3# is disqualified.
Comparing samples 2#, 4#, 5#, 6#, except for the depth d=0.6 of the scarf joint section 111 of sample 4#, the other L2, b, c, R1 and R2 all meet the design requirement range except for the range that the dimension requirement L2-0.5 is less than or equal to d and less than or equal to L2+0.5, after the cover plate 200 and the cell shell 100 are subjected to laser welding, the problems of cold welding and hole explosion occur at the welding part due to the small depth d of the scarf joint section 111, and meanwhile, the end surface of the cover plate 200 at one side, which is far away from the installation space, protrudes out of the end part of the scarf joint section 111 of the cell shell 100 to exceed 0.5mm, welding is poor, helium leak detection rate does not meet the requirement, and sample 4# is disqualified;
comparing samples 2#, 5#, 6#, 7#, except for the depth d=1.8 of the scarf joint section 111 of the sample 7#, the range of the dimensional requirement L2-0.5 is not more than or equal to d and less than or equal to L2+0.5, and the other L2, b, c, R1 and R2 all meet the range of the design requirement, after the cover plate 200 and the cell shell 100 are welded by laser, the problems of cold welding and hole explosion occur at the welding part due to the fact that the depth d of the scarf joint section 111 is bigger, the end face of the cover plate 200 at the side deviating from the installation space is sunk into the end part of the scarf joint section 111 of the cell shell 100 by more than 0.5mm, welding is poor, helium leak detection rate does not meet the requirement, and the sample 7# is unqualified;
comparing samples 2#, 5#, 6#, 8#, except that the width b=0.3 of the first seam of sample 8#, the remaining L2, c, d, R1, R2 all satisfy the design requirement range, except that the dimension requirement b is not less than 0.2, and after the cover 200 is laser welded to the cell housing 100, the situation of leaking in the laser occurs at the four corners of the electrode group 300, which are corresponding to the positions of the fillets 130, inside the cell housing 100. Since the shielding section 112 is disposed on the first side plate 110, the inner wall surface of the second side plate 120 is a plane (no shielding section 112 is disposed) and the fillet 130 is used as a transition surface between the first side plate 110 and the second side plate 120, the shielding section 112 is not obvious, so that when the gap size of the first joint b is too large, laser is leaked in, and the sample 8# is failed;
comparing 2#, 5#, 6#, 9#, except that the radius R1 of the fillet 130 of sample 9# is not in the range of 1.5mm < R1 < 5mm in size requirement, the radius R2 of the bullnose 213 of sample 9# is not in the range of 0 < R1-R2 < 0.5mm in size requirement, and the rest L2, b, c, d all meet the range of design requirement, after the cover plate 200 and the cell housing 100 are welded by laser, the track is incoherent due to the undersize of the radius R1 of the fillet 130, the false welding and broken welding occur, the helium leak detection rate does not meet the requirement, and sample 9# is unqualified;
for sample # 10, the thickness l2=0.5 of the body 210, L2, is at the minimum boundary of the value range of l2+.0.5 mm. The width b=0.2 of the first joint, b is on the maximum boundary of the value range of 0.ltoreq.b.ltoreq.0.2, the rest c, d, R1 and R2 all meet the range of design requirements, when the cover plate 200 and the cell shell 100 are welded by laser, no laser leaks into the installation space of the cell shell 100, the pole group 300 is not damaged, the welding quality of the matching part of the cell shell 100 and the cover plate 200 is good, the welding strength is high, and the sample 10# is qualified;
aiming at a sample 11#, the radius R1=1.5 of the fillet 130 is positioned on the minimum boundary of the value range with the size requirement of 1.5 mm-less R1-less 5mm, d=L2+0.5 is positioned on the maximum boundary of the value range with the size of L2-0.5-less d-less L2+0.5, the rest L2, b, c and R2 all meet the range of design requirements, when the cover plate 200 and the cell shell 100 are welded by laser, the track is consistent during welding, the conditions of no cold welding and no broken welding are avoided, the welding quality of the matching part of the cell shell 100 and the cover plate 200 is good, the welding strength is higher, the helium leak detection rate meets the requirement, no laser leaks into the installation space of the cell shell 100, the electrode group 300 is not damaged, and the sample 11# is qualified;
for sample 12#, the projected width c=0.5 of the step surface of the shielding section 112 on the cover plate 200 along the height direction of the cell housing 100 is positioned on the maximum boundary of the value range of 2 b.ltoreq.c.ltoreq.0.5 mm, d=L2-0.5 is positioned on the minimum boundary of the value range of L2-0.5.ltoreq.d2+0.5, the radius R1=5 of the fillet 130 is positioned on the maximum boundary of the value range of 1.5mm.ltoreq.R1.ltoreq.5 mm, the radius R2=4.5 of the external fillet 213 is positioned on the maximum boundary of the value range of 0.ltoreq.R1-R2.5 mm, the rest L2 and b meet the range of design requirements, the track is consistent when the cover plate 200 and the cell housing 100 are welded by laser, no virtual helium and broken welding conditions exist when the cell housing 100 and the cover plate 200 are matched, the welding quality is good, the welding strength is high, the leak detection rate meets the requirement, and the leak detection requirement does not exist in the mounting space of the cell housing 100, and the sample 300 cannot be damaged by the leak in the mounting space of the cell housing 12.
In summary, when the battery cell satisfies the values of L2, b, c, d, R1 and R2 and the dimensional matching relationship between L2, b, c, d, R1 and R2 and other parameters, good welding quality and welding air tightness can be ensured, and no laser leaks into the installation space of the battery cell housing 100.
Referring to fig. 7, the battery cell in the present embodiment further includes a pole group 300, and the pole group 300 is disposed inside the battery cell housing 100. Through adopting the cooperation structure between foretell electric core casing 100 and the apron 200, guaranteed to have fine leakproofness between the apron 200 of electric core and the electric core casing 100, welding strength, welding quality between the apron 200 of electric core and the electric core casing 100 are higher simultaneously, are difficult for taking place to leak, and the utmost point post is difficult for burning in the welding process, and overall security is good.
As an alternative, only one side of the battery cell casing 100 is provided with an opening in this embodiment, that is, one ends of the first side plate 110 and the second side plate 120 of the battery cell casing 100, which deviate from the opening, are connected with a bottom plate, and one ends of the first side plate 110 and the second side plate 120 are assembled with the cover plate 200 by adopting the above-mentioned matching structure.
Of course, in other embodiments, the case where the two ends of the cell housing 100 have openings is also suitable, and two cover plates 200 are also provided at this time, one of which is a positive cover plate and the other is a negative cover plate, and the positive cover plate and the negative cover plate are assembled with the two openings respectively. The top end and the bottom end of the first side plate 110 of the battery cell casing 100 are respectively provided with an scarf joint section 111 and a shielding section 112, and the pole group accommodating section 113 is positioned in the middle, namely, the scarf joint section 111, the shielding section 112, the pole group accommodating section 113, the other shielding section 112 and the other scarf joint section 111 are sequentially connected along the height direction of the battery cell casing 100. The positive electrode cover plate is connected with one scarf joint section 111 of the cell housing 100, and the negative electrode cover plate is connected with the other scarf joint section 111 of the cell housing 100 by adopting the matching structure between the cell housing 100 and the cover plate 200.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A cell, comprising:
the battery cell comprises a battery cell shell, wherein at least one end of the battery cell shell is provided with an opening, and the inner wall surface of the battery cell shell comprises an embedding section, a shielding section and a pole group accommodating section;
the cover plate comprises a body embedded in the opening, four corners of the body are in interference fit with the scarf joint section, the rest part of the body is in clearance fit with the scarf joint section, and the body is in welded connection with the scarf joint section;
when the cover plate is assembled with the battery cell shell, the depth of the scarf joint section is d, and the thickness L2 of the body meets the following conditions: l2-0.5 is less than or equal to d and less than or equal to L2+0.5, and L2 is more than or equal to 0.5mm.
2. The cell of claim 1, wherein the scarf section has a wall thickness a that satisfies: a is more than or equal to 0.3mm and less than or equal to 1mm.
3. The cell of claim 2, wherein the wall thickness of the pole group receiving section is f, the shielding section has an inclined step surface, the width of the projection of the step surface on the cover plate along the height direction of the cell housing is c, a first joint is arranged between the scarf section and the body, and the width of the first joint is b;
wherein, c is more than or equal to 2b and less than or equal to 0.5mm;
the width b of the first seam satisfies: b is more than or equal to 0 and less than or equal to 0.2.
4. The battery cell according to claim 3, wherein the battery cell housing comprises two first side plates and two second side plates, the two first side plates and the two second side plates are arranged oppositely, the first side plates and the second side plates are connected in sequence, the same ends of the first side plates and the second side plates are surrounded to form the opening, the body comprises a first side edge and a second side edge, the first joint is arranged between the first side plate and the first side edge, the second joint is arranged between the second side plate and the second side edge, and the width of the second joint is g;
the width g of the second seam satisfies: g is more than or equal to 0 and less than or equal to 0.5mm.
5. The cell of claim 4, wherein the first side plate comprises an scarf section, a shielding section and a pole group accommodating section arranged in sequence, the scarf section being located on an inner wall surface of the first side plate near one end of the opening.
6. The cell of claim 4, wherein the first side plate and the second side plate are connected by a fillet transition, the fillet having a radius R1;
the first side edge and the second side edge are in transitional connection through a bullnose, and the radius of the bullnose is R2;
wherein the radius R1 of the fillet satisfies: r1 is more than or equal to 1.5mm and less than or equal to 5mm;
the radius R2 of the bullnose satisfies: R1-R2 is more than or equal to 0 and less than or equal to 0.5mm.
7. The battery cell according to claim 3, wherein a boss is further arranged on one side of the body facing the battery cell housing, the boss is circumferentially provided with a guide part, and the boss extends into the battery cell housing from the opening;
wherein the thickness of the cover plate is L1, the thickness of the boss is L3, l1=l2+l3;
the thickness L1 of the cover plate meets the following conditions: l1 is more than or equal to 0.7mm and less than or equal to 5mm;
the thickness L3 of the boss satisfies the following conditions: l3 is more than or equal to 0.2mm.
8. The cell of claim 7, wherein the guide portion is a chamfer surface mated with the step surface, the step surface having an included angle x with the extended surface of the scarf section;
the body comprises an outer end face and a side face, the side face is positioned in the circumferential direction of the outer end face and connected with the outer end face, the side face is matched with the scarf joint section, an included angle z is formed between the chamfer face and an extension face of the side face, and the included angle z is larger than or equal to the included angle x;
wherein, contained angle x satisfies: x is more than or equal to 30 degrees;
the included angle z satisfies the following conditions: z is less than or equal to 60 degrees.
9. The cell of claim 1, wherein the body and the scarf joint section have a weld width w and a penetration h;
wherein, the width of fusion w satisfies: w is more than or equal to 0.6mm;
the penetration h satisfies: h is more than or equal to 0.5mm and less than or equal to 1.0mm.
10. The cell of claim 1, further comprising a pole set disposed inside the cell housing.
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Cited By (1)
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| CN117895091A (en) * | 2024-03-14 | 2024-04-16 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electricity utilization device |
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