CN215989030U - Secondary battery and shell thereof - Google Patents
Secondary battery and shell thereof Download PDFInfo
- Publication number
- CN215989030U CN215989030U CN202121750023.6U CN202121750023U CN215989030U CN 215989030 U CN215989030 U CN 215989030U CN 202121750023 U CN202121750023 U CN 202121750023U CN 215989030 U CN215989030 U CN 215989030U
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- welding part
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- 238000003466 welding Methods 0.000 claims abstract description 139
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 19
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009957 hemming Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses a secondary battery and a shell thereof. The housing includes: the first shell comprises a body part and a first welding part arranged on the edge or the surface of the body part; the second casing is connected with the first casing, and the external diameter of first casing is less than or equal to the internal diameter of second casing, and the second casing includes bottom and lateral wall, and the one end and the bottom of lateral wall are connected, and the other end of lateral wall is provided with the second welding part, and the welding of mutually supporting of second welding part and first welding part, the welding department are embedded integrated configuration. The edge or the surface of the first shell is provided with the first welding part and the opening of the second shell is provided with the second welding part, and the welding part of the first welding part and the second welding part is of an embedded combined structure, so that the first shell and the second shell are prevented from displacing during welding, the space is saved, and the process of cutting off flash is reduced.
Description
Technical Field
The utility model relates to the technical field of secondary battery manufacturing, in particular to a secondary battery and a shell thereof.
Background
Secondary batteries such as lithium ion batteries are widely used in electronic devices such as mobile phones and notebook computers because of their advantages such as high energy density and environmental friendliness. In recent years, in order to cope with environmental issues, gasoline price issues, and energy storage issues, the application of lithium ion batteries has been rapidly expanded to gasoline-electric hybrid vehicles, ships, and energy storage systems, and the like. A secondary battery generally includes a case, a cell, and a cap plate connected to the case. In order to avoid leakage of the electrolyte solution and protect the battery cell from damage, the battery cell needs to be accommodated in the casing, and then the casing and the cover plate need to be welded. There are the following problems: (1) the connection of the shell and the cover plate is in flat contact, and the cover plate and the shell are easy to displace during welding. (2) In order to facilitate welding, the shell and the cover plate are provided with longer flash structures, the flash is welded by laser, and the overlong flash is cut off after the flash is welded, so that the space is wasted in the former, and the working procedure is increased in the latter.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, an object of the present invention is to provide a secondary battery and a casing thereof, in which a first welding portion is disposed on an edge or a surface of a first case, a second welding portion is disposed at an opening of a second case, and a welding portion between the second welding portion and the first welding portion is an embedded combination structure, so that the first case and the second case are prevented from being displaced during welding, a space is saved, and a process of cutting off burrs is reduced.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the present invention provides a secondary battery case, including:
the first shell comprises a body part and a first welding part arranged on the edge or the surface of the body part;
the second casing, with first casing is connected, just the external diameter of first casing is less than or equal to the internal diameter of second casing, the second casing includes bottom and lateral wall, the one end of lateral wall with the bottom is connected, the other end of lateral wall is provided with the second welding part, the second welding part with the welding of mutually supporting of first welding part, the welding department is embedded integrated configuration.
Further, the second welding part and the side wall form an annular step structure or a flat structure.
Further, the first welding part and the body part form an annular boss structure, a curling structure or an annular step structure.
Further, the body portion includes a sheet metal structure. Through right the body portion carries out the panel beating, forms the sheet metal structure for the structural strength of first casing obtains promoting. Meanwhile, as the structural strength of the first shell is improved by the sheet metal structure, the structural strength of the first shell can not be reduced when the lighter and thinner material is used, and the material cost is saved.
Furthermore, the first welding part and the second welding part are in interference fit of 0-0.05mm or fit of 0-0.05mm in clearance. The first welding part and the second welding part are in interference fit of 0-0.05mm or fit of 0-0.05mm in clearance, and therefore the stability of fit can be guaranteed. The gap is 0-0.05mm, and the first shell can be embedded into the second shell better. The interference fit of 0-0.05mm can make the fit between the first shell and the second shell tighter.
Furthermore, the inner surfaces of the first shell and the second shell are provided with insulating glue layers. The inner surfaces of the first shell and the second shell are provided with the insulating glue layers, so that the positive pole lug of the battery cell is prevented from contacting with the first shell or the second shell, and the secondary battery is prevented from being short-circuited.
Further, first casing or/and the second casing is provided with explosion-proof valve, and explosion-proof valve is the laser nick, the laser nick includes single arc nick, double arc nick and S type nick, wherein, double arc nick is the relative double arc nick in arc top. First casing with/or the second casing is provided with explosion-proof valve, adopts laser to carry out the sculpture for the laser nick, and under specific internal pressure, the nick position can be broken through to guarantee secondary battery' S security, will the laser nick includes single arc nick, double arc nick and S type nick. The first shell or/and the second shell is/are provided with an explosion-proof valve, when the internal air pressure of the secondary battery rises to a specific air pressure value, the explosion-proof valve can be broken, gas is discharged, the internal air pressure and the external air pressure of the secondary battery are consistent, and the secondary battery is prevented from being cracked or burst due to the fact that the internal pressure of the secondary battery is too high and cannot be discharged. The first shell or/and the second shell are/is subjected to laser etching to form a single arc-shaped nick, a double arc-shaped nick and an S-shaped nick, the shapes are etched, and when the internal air pressure rises, the explosion-proof valve can be better broken.
Further, the thickness of the shell at the laser scoring position is 0.02-0.05mm, and the included angle of the laser scoring is 45-70 degrees. The above-mentioned scheme makes the shell in this position become weak, sets to above-mentioned contained angle simultaneously, when secondary battery's inside atmospheric pressure risees, explosion-proof valve can better burst.
Furthermore, the first shell or the second shell is provided with a pole, a liquid injection port and a metal nickel welding sheet. The metal nickel welding sheet is used as a cathode leading-out end and is welded on the shell by adopting laser, so that the metal nickel welding sheet is convenient to be electrically connected with a lead of an external circuit in a tin soldering mode
The utility model also provides a secondary battery which comprises the shell in the scheme and a battery cell which is accommodated in the shell and welded with the shell.
The utility model has the following beneficial effects: (1) set up first welding part and set up the second welding part at the opening part of second casing at the edge or the surface of first casing, first welding part and second welding part are mutually supported, and during the welding, slight pressure has just can guarantee the in close contact of two parts, can not produce the clearance, can not take place to shift yet and lead to the edge can not align yet, make the battery have good leakproofness. (2) Because the external diameter of the first shell is smaller than the internal diameter of the second shell, and the welding position is of an embedded combined structure, the working procedure of cutting off the flash after welding is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a housing according to embodiment 1 of the present invention;
FIG. 2 is an enlarged view of the weld of FIG. 1;
FIG. 3 is a schematic structural diagram of a housing according to embodiment 2 of the present invention;
FIG. 4 is an enlarged view of the weld of FIG. 3;
FIG. 5 is a schematic structural diagram of a housing according to embodiment 3 of the present invention;
FIG. 6 is an enlarged view of the weld of FIG. 5;
FIG. 7 is a schematic structural view of a housing according to embodiment 4 of the present invention;
FIG. 8 is an enlarged view of the weld of FIG. 7;
FIG. 9 is a schematic structural view of a housing according to embodiment 5 of the present invention;
FIG. 10 is an enlarged view of the weld of FIG. 9;
FIG. 11 is a schematic structural view of a housing according to embodiment 6 of the present invention;
FIG. 12 is an enlarged view of the weld of FIG. 11;
FIG. 13 is a schematic structural view of a housing according to embodiment 7 of the present invention;
FIG. 14 is an enlarged view of the weld of FIG. 13;
FIG. 15 is a perspective view of a second upwardly opening housing of the present invention;
FIG. 16 is a perspective view of a second housing of the present invention with the opening to the right;
FIG. 17 is a perspective view of a second housing of the present invention with the opening facing forward;
fig. 18 is a sectional view of a secondary battery in which a core of the present invention is a winding core;
fig. 19 is a sectional view of a secondary battery of the present invention in which cells are laminated;
FIG. 20 is a schematic view of the explosion-proof valve of the present invention with a single arcuate score;
FIG. 21 is a schematic view of the explosion-proof valve of the present invention with double arcuate scores;
FIG. 22 is a schematic view of an explosion-proof valve of the present invention with S-shaped scores;
FIG. 23 is a graph of laser scoring included angles of the present invention;
the labels in the figure are: a-a housing; 1-a first housing; 11-a body portion; 12-a first weld; 2-a second housing; 21-bottom; 22-a side wall; 23-a second weld; 3-an explosion-proof valve; 4-liquid injection port; 5-positive pole column; 51-a metal layer; 52-sealing ring; 6-metal nickel welding sheet; 7-an isolating membrane; 81-positive pole piece; 82-positive pole tab; 91-negative pole piece; 92-negative pole tab.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).
Example 1
As shown in fig. 1 to 2, a secondary battery case a includes a first case 1 and a second case 2.
The first shell 1 comprises a body part 11 and a first welding part 12 arranged on the edge of the body part 11, wherein the first welding part 12 and the body part 11 are integrally formed, the first welding part 12 and the body part 11 form a curling structure, and the thickness of the first shell 1 is 0.05mm-0.2 mm.
The second housing 2 includes a bottom 21 and a side wall 22, the side wall 22 and the bottom 21 are integrally formed, one end of the side wall 22 is connected to the bottom 21, a second welding portion 23 is disposed at the other end of the side wall 22, the second welding portion 23 and the side wall 22 are integrally formed, and the second welding portion 23 and the side wall 22 form an annular step structure. As shown in FIGS. 15 to 17, the opening of the second housing 2 may be oriented in any direction, including upward, rightward and forward, and the thickness of the second housing 2 is 0.05mm to 0.2 mm.
The first shell 1 covers the opening of the second shell 2, the outer diameter of the body part 11 is smaller than the inner diameter of the second welding part 23, and the outer diameter of the first welding part 12 and the inner diameter of the second welding part 23 are in clearance fit or interference fit of 0-0.05mm, so that the first welding part 12 is embedded in the second welding part 23, and the stability between the first shell 1 and the second shell 2 is ensured. The edge of the first shell 1 is arranged to be in a hemming structure, the opening of the second shell 2 is arranged to be in an annular step structure, the first shell 1 and the second shell 2 are guaranteed to be precisely positioned, and the first welding portion 12 and the second welding portion 23 are welded by laser, so that the battery has good sealing performance. The shape of the shell A comprises a square shape and a special shape (such as an L shape).
As shown in FIGS. 15 to 17, the pouring outlet 4 and the metallic nickel welded piece 6 are provided in the side wall 22 of the first casing 1 or the second casing 2. Annotate liquid mouth 4 and seal with sealed nail after annotating the liquid, remove sealed nail after the formation, the exhaust adopts laser welding to weld circular shape stainless steel piece on annotating liquid mouth 4, seals and annotates liquid mouth 4. The metal nickel welding sheet 6 is used as a cathode leading-out end and is welded on the shell by adopting laser, so that the metal nickel welding sheet is convenient to be electrically connected with a lead of an external circuit by tin soldering.
To first casing 1 or/and second casing 2 adopts laser to carry out the sculpture, is provided with explosion-proof valve 3, as shown in fig. 20 ~ 23, explosion-proof valve 3 is the laser nick, and the laser nick includes single arc nick, double arc nick and S type nick, and wherein, double arc nick is the double arc nick that the arc top is relative. The thickness of the shell at the laser nicking position is 0.02-0.05mm, and the included angle of the laser nicking is 45-70 degrees. When the internal pressure of the secondary battery is increased to a specific internal pressure, the nicked part can be broken, and the gas in the secondary battery is discharged, so that the gas in the secondary battery is recovered to be normal, and the safety of the battery is ensured.
As shown in fig. 18 to 19, the positive electrode tab 81, the negative electrode tab 91, and the separator 7 are wound or laminated to form a cell, and the positive electrode tab 82 and the negative electrode tab 92 are led out from the same end of the cell.
The positive electrode tab 82 and the negative electrode tab 92 are respectively an aluminum tape and a copper nickel plating tape (copper tape, nickel tape), and are welded on the empty foil of the corresponding pole piece by ultrasonic welding.
The positive electrode lug 82 of the battery core is welded through ultrasonic waves, resistance welding or laser welding is carried out on the positive electrode pole 5, the positive electrode pole 5 comprises a metal layer 51 (the material is one of aluminum, nickel and stainless steel) and a sealing ring 52 arranged between the metal layer 51 and the shell, the sealing ring 52 is made of an insulating material capable of preventing electrolyte corrosion, the sealing ring 52 is used for separating the metal layer 51 from the shell, the battery short circuit is avoided, and meanwhile the sealing ring is used for preventing electrolyte from leaking from the joint of the positive electrode pole 5 and the shell A. The negative electrode is directly welded inside the case by resistance welding or laser welding. And insulating the non-welding points of the aluminum strip, wherein the processing mode comprises hot-pressing PP glue, pasting insulating gummed paper and coating insulating glue.
The inner wall of the shell A formed by connecting the first shell 1 and the second shell 2 is sprayed with a thin layer of insulating material or covered by adhesive paper to form an insulating layer, so that the short circuit caused by the direct contact of the positive pole lug 82 with the stainless steel on the inner wall of the shell A is prevented.
The insulating material comprises polypropylene rubber, fluororubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene, butyl, curing glue, FPA and ceramic. And the second shell 2 is compounded with the side wall 22 of the second shell in a compound mode including riveting, injection molding, glue bonding, hot-press compounding (a battery tab manufacturing process), ultrasonic welding, spray molding curing, high-temperature curing agent, sintering and the like.
Example 2
As shown in fig. 3 to 4, unlike embodiment 1, the first welding portion 12 of the present embodiment is disposed on the surface of the first housing 1, and forms an annular boss structure with the first housing 1, where the annular boss is a laser welding metal sheet, a thermal compound insulator, or an injection molding insulator. The first housing 1 is covered on the second housing 2, and a sealed container is formed by laser welding, wherein the outer diameter of the body part 11 is equal to the outer diameter of the opening of the second housing 2, and the outer diameter of the first welding part 12 and the inner diameter of the second welding part 23 are in clearance fit of 0-0.05mm or interference fit of 0-0.05 mm. Form annular step convex structure through with first casing 1 and first welding part 12, the opening part of second casing 2 sets up to annular step structure simultaneously to make first welding part 12 embedded in second welding part 23, guarantee first casing 1 and second casing 2 precision positioning, first welding part 12 of laser welding and second welding part 23 make the battery have better leakproofness.
The rest is the same as the embodiment 1, and the description is omitted.
Example 3
As shown in fig. 5 to 6, unlike embodiment 1, the first welding portion 12 of the present embodiment is provided at the edge of the main body 11, and is integrally formed with the main body 11, and the main body 11 is bent in a trapezoidal shape toward one side to form a sheet metal structure. The outer diameter of the main body 11 is smaller than the inner diameter of the second welding part 23, the first welding part 12 is embedded in the second welding part 23, and the outer diameter of the first welding part 12 and the inner diameter of the second welding part 23 are in clearance fit or interference fit of 0-0.05 mm. The main body 11 is bent to form a sheet metal structure, so that the structural strength of the first housing 1 is enhanced and the first housing can bear a large external pressure. Because the first welding part 12 is embedded in the second welding part 23, the precise positioning of the first shell 1 and the second shell 2 is ensured, and the first welding part 12 and the second welding part 23 are welded by laser, so that the battery has better sealing property.
The rest is the same as the embodiment 1, and the description is omitted.
Example 4
As shown in fig. 7 to 8, different from embodiment 1, in this embodiment, the main body 11 is punched to form the first welding portion 12, the first welding portion 12 is disposed at the edge of the main body 11, is integrally formed with the main body 11, and forms an annular step structure with the main body 11, the outer diameter of the main body 11 is smaller than the inner diameter of the first welding portion 12, the outer diameter of the first welding portion is equal to the outer diameter of the second welding portion 23, and the first welding portion 12 and the second welding portion 23 are matched with each other, so that the first housing 1 is embedded in the second housing 2. Through setting up first welding part 12 into annular stair structure, second welding part 23 sets up into annular stair structure simultaneously for first casing 1 is embedded in second casing 2, guarantees first casing 1 and second casing 2 precision positioning, and first welding part 12 of laser welding and second welding part 23 make the battery have better leakproofness.
The rest is the same as the embodiment 1, and the description is omitted.
Example 5
As shown in fig. 9 to 10, unlike embodiment 1, in this embodiment, the main body 11 is pressed to form the first welding portion 12, and the first welding portion 12 is disposed at the edge of the main body 11, is integrally formed with the main body 11, and forms an annular step structure with the main body 11. The second welding portion 23 is configured as a flat structure, the outer diameter of the first welding portion 12 is equal to the outer diameter of the second welding portion 23, the outer diameter of the main body 11 is smaller than the outer diameter of the second welding portion 23, and the portion of the main body 11 not provided with the first welding portion 12 is embedded into the opening of the second housing 2. Through setting up first welding portion 12 into annular stair structure, second welding portion 23 sets up to the flat mouthful structure simultaneously, and first welding portion 12 and second welding portion 23 mutually support for first casing 1 is embedded in second casing 2, guarantees first casing 1 and second casing 2 precision positioning, and first welding portion 12 of laser welding and second welding portion 23 make the battery have better leakproofness.
The rest is the same as the embodiment 1, and the description is omitted.
Example 6
As shown in fig. 11 to 12, unlike embodiment 1, the first welding portion 12 of the present embodiment is provided at the edge of the main body 11, and is integrally formed with the main body 11, and the main body 11 is bent in a square shape toward one side to form a sheet metal structure. The second welding portion 23 is configured as a flat structure, the outer diameter of the main body portion 11 is smaller than the inner diameter of the second welding portion 23, the outer diameter of the first welding portion 12 is equal to the outer diameter of the second welding portion 23, the bent portion of the main body portion 11 protrudes into the inner cavity of the housing formed by connecting the first housing 1 and the second housing 2, and the main body portion 11 is embedded in the second housing 2. The main body 11 is bent to form a sheet metal structure, so that the structural strength of the first housing 1 is enhanced and the first housing can bear a large external pressure. Simultaneously second weld part 23 sets up to the plain end structure, and first weld part 12 mutually supports with second weld part 23 for first casing 1 is embedded in second casing 2, guarantees first casing 1 and second casing 2 precision positioning, and first weld part 12 of laser welding and second weld part 23 make the battery have better leakproofness.
Example 7
As shown in fig. 13 to 14, unlike embodiment 1, the first welding portion 12 of the present embodiment is disposed on the surface of the first housing 1, and forms an annular boss structure with the first housing 1, where the annular boss is a laser welding metal sheet, a thermal compound insulator, or an injection molding insulator. The second welding portion 23 is a flat structure, and the second welding portion 23 and the sidewall 22 are integrally formed. The first housing 1 is covered on the second housing 2, and a sealed container is formed by laser welding, wherein the outer diameter of the body part 11 is equal to the outer diameter of the opening of the second housing 2, and the outer diameter of the first welding part 12 and the inner diameter of the second welding part 23 are in clearance fit with each other by 0-0.05 mm. Through forming annular step convex structure with first casing 1 and first welding part 12 to make first welding part 12 embedded in second welding part 23, guarantee first casing 1 and second casing 2 precision positioning, first welding part 12 of laser welding and second welding part 23 make the battery have better leakproofness.
The rest is the same as the embodiment 1, and the description is omitted.
The above description is only an embodiment of the present invention, and does not limit the scope of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the inventive concept of the present invention.
Claims (10)
1. A secondary battery case, comprising:
the first shell comprises a body part and a first welding part arranged on the edge or the surface of the body part;
the second casing, with first casing is connected, just the external diameter of first casing is less than or equal to the internal diameter of second casing, the second casing includes bottom and lateral wall, the one end of lateral wall with the bottom is connected, the other end of lateral wall is provided with the second welding part, the second welding part with the welding of mutually supporting of first welding part, the welding department is embedded integrated configuration.
2. The housing of claim 1, wherein the second weld forms an annular step structure or a flat structure with the sidewall.
3. The housing of claim 1, wherein the first weld forms an annular boss structure, a bead structure, or an annular step structure with the body.
4. A housing according to claim 1, wherein the body portion comprises a sheet metal structure.
5. The housing of claim 1, wherein the first weld and the second weld are in an interference 0-0.05mm fit or a clearance 0-0.05mm fit.
6. The enclosure of claim 1, wherein the inner surfaces of the first shell and the second shell are provided with an insulating glue layer.
7. The housing of claim 1, wherein the first housing and/or the second housing is provided with an explosion-proof valve, the explosion-proof valve is a laser score, the laser score comprises a single arc score, a double arc score and an S-shaped score, wherein the double arc score is a double arc score opposite to an arc top.
8. The shell according to claim 7, wherein the thickness of the shell at the laser score is 0.02-0.05mm, and the included angle of the laser score is 45-70 °.
9. The casing of claim 1, wherein the first casing or the second casing is provided with a pole, a liquid injection port and a metal nickel welding sheet.
10. A secondary battery comprising the casing according to any one of claims 1 to 9 and a cell housed in the casing and welded to the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121750023.6U CN215989030U (en) | 2021-07-29 | 2021-07-29 | Secondary battery and shell thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118676495A (en) * | 2024-08-20 | 2024-09-20 | 蜂巢能源科技股份有限公司 | Battery cell shell and battery cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118676495A (en) * | 2024-08-20 | 2024-09-20 | 蜂巢能源科技股份有限公司 | Battery cell shell and battery cell |
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Effective date of registration: 20241016 Address after: 523000 No. 1 workshop of Tangxia Village Industrial Zone, Gao Gao town, Dongguan, Guangdong Patentee after: DONGGUAN LIWINON ENERGY TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 523000 Room 101, building 1, No. 1, tangsha Road, Gaopo Town, Dongguan City, Guangdong Province Patentee before: Dongguan lithium Microelectronics Technology Co.,Ltd. Country or region before: China |