CN217158396U - Pole welding structure of square steel shell battery and battery - Google Patents
Pole welding structure of square steel shell battery and battery Download PDFInfo
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- CN217158396U CN217158396U CN202123412602.2U CN202123412602U CN217158396U CN 217158396 U CN217158396 U CN 217158396U CN 202123412602 U CN202123412602 U CN 202123412602U CN 217158396 U CN217158396 U CN 217158396U
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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
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Abstract
The utility model belongs to the technical field of battery production and manufacture, in particular to a pole welding structure of a square steel shell battery and a battery, which comprises a first pole (1); a second pole (2); the bottom of first utmost point post (1) be provided with through hole (3) or blind hole (4) that second utmost point post (2) match, second utmost point post (2) pass through hole (3) or blind hole (4) and with first utmost point post (1) fixed connection, the bottom of second utmost point post (2) is provided with extension (21), extension (21) and the utmost point ear fixed connection of battery. The utility model discloses utmost point ear is buckled impaired many times and is leaded to thin foil and fracture when can preventing the internal weld utmost point ear, helps improving the quality of battery, reduces the defective rate, promotes the benefit.
Description
Technical Field
The utility model belongs to the technical field of the battery production is made, concretely relates to utmost point post welded structure and battery of square steel-shelled battery.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. The material of the positive pole column of the small-sized steel shell square battery is metal aluminum, the positive pole column is riveted on the steel shell, and the pole lug of the battery cell is welded on the pole column in a laser welding mode.
The laser welding direction has two types of external welding and internal welding. The external welding is adopted, generally, the pole column needs to be thinned, so that the laser of the external welding can penetrate through the thin pole column to weld the pole lug on the pole column, the external welding can be realized by the method, but the sealing piece is welded outside the welding seal in the structure, the welding part of the pole lug welding position is prevented from being penetrated by welding to cause the liquid leakage failure of the battery, and the process cost and the material cost are increased by the method. The other mode is to adopt internal welding, from casing internal welding, and this kind of welding method utmost point post thickness can be done very thickly, and utmost point post is welded and is worn when can preventing to weld, but need use laser to weld utmost point post to utmost point post from inside earlier in the welding on, turns over again and turns over electric core and go into the shell, and utmost point ear crowd receives the pulling force easily in going into the shell, breaks off, leads to the electricity to connect inefficacy.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model lies in: to prior art's not enough, provide a utmost point post welded structure of square steel shell battery, utmost point ear is buckled impaired many times and is leaded to thin foil and fracture when can preventing the internal weld utmost point ear, helps improving the quality of battery, reduces the defective rate, promotes the benefit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a pole welding structure of a square steel shell battery comprises a first pole; a second pole; the bottom of first utmost point post be provided with through hole or blind hole that the second utmost point post matches, the second utmost point post passes the through hole or the blind hole and with first utmost point post fixed connection, the bottom of second utmost point post is provided with the extension, the utmost point ear fixed connection of extension and battery.
Preferably, the extension portion surrounds the bottom of the second pole, and the second pole and the extension portion form a T-shaped structure.
Preferably, the first pole column and the second pole column are fixedly connected through laser welding, and the welding mode is seam welding or penetration welding.
Preferably, the end face of the second pole is circular, square or rectangular, and the end face of the extension part is circular, oval, square or rectangular.
Preferably, the outer diameter of the second pole is equal to the inner diameter of the through hole or the blind hole.
Preferably, the outer wall of the first pole is provided with a concave portion, the concave portion surrounds the outer wall of the first pole, and the concave portion is used for embedding a sealing element connected with the side wall of the shell.
A second object of the present invention is to provide a battery, which comprises a cover plate; a housing provided with an opening; the battery cell is accommodated in the shell; and the pole welding structure of the square steel shell battery is fixedly connected with the side wall of the shell, the cover plate is fixed at the opening, and the cover plate is used for sealing the battery cell in the shell.
Preferably, the battery cell comprises a positive plate, an isolation film and a negative plate, the positive plate, the isolation film and the negative plate are formed by stacking or winding the battery cell, and a tab is arranged on the end face of the battery cell.
Preferably, the edge of the opening or the cover plate is provided with a step, and the shell and the cover plate are fixedly connected through laser welding.
Preferably, the casing lateral wall is provided with annotates the liquid mouth, annotate the liquid mouth and install the gasket, the apron is provided with explosion-proof nick.
The utility model has the advantages that the utility model comprises a first pole; a second pole; the bottom of first utmost point post be provided with through hole or blind hole that the second utmost point post matches, the second utmost point post passes the through hole or the blind hole and with first utmost point post fixed connection, the bottom of second utmost point post is provided with the extension, the utmost point ear fixed connection of extension and battery. Because the tab is welded on the pole by using laser from the inside in the welding of the existing structure, then the cell is turned over and inserted into the shell, the tab group is easy to be pulled and broken in the shell to cause electric connection failure, the pole is divided into two parts, the first pole is sleeved with a sealing insulating material, the middle of the first pole is provided with a through hole or a blind hole, the second pole can be placed into the through hole or the blind hole of the first pole, and the second pole and the tab group are convenient to be laser welded together by adding an extension part, namely the second pole and the tab group are laser welded together and then inserted into the shell to reduce the bending times of the tab, and the tab is not required to be turned over and inserted into the shell to prevent the thin foil material from being broken due to repeated bending and damage of the tab when the tab is welded inside, wherein the first pole and the second pole adopt an external laser welding mode, and the welding position is positioned at the top of the pole, and a sealing sheet is not welded outside the welding seal, so that the battery leakage failure caused by the welding penetration of the welding part at the lug welding position is prevented, and the production cost is reduced. The invention can prevent the tab from being broken due to the thin foil caused by repeated bending damage when the tab is welded inside, thereby being beneficial to improving the quality of the battery, reducing the reject ratio and improving the benefit.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is an exploded view of a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a battery according to an embodiment of the present invention.
Fig. 4 is a schematic view illustrating a connection between a cover plate and a housing according to a first embodiment of the present invention.
Fig. 5 is a schematic view of the connection between the cover plate and the housing according to the second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 7 is an exploded view of a third embodiment of the present invention.
Fig. 8 is a schematic diagram of a battery assembled according to a third embodiment of the present invention.
Fig. 9 is a schematic view of the connection between the cover plate and the housing according to the third embodiment of the present invention.
Fig. 10 is a schematic view of the connection between the cover plate and the housing according to the fourth embodiment of the present invention.
Fig. 11 is a schematic view illustrating an installation of the cover plate and the housing according to the first embodiment of the present invention.
Fig. 12 is an installation diagram of the cover plate and the housing according to the fifth embodiment of the present invention.
Fig. 13 is an installation diagram of a cover plate and a housing according to a sixth embodiment of the present invention.
Wherein the reference numerals are as follows:
1-a first pole; 11-a recess;
2-a second pole; 21-an extension;
3-a through hole;
4-blind holes;
5-a seal;
6-cover plate; 61-explosion-proof scoring;
7-a housing; 71-liquid injection port; 711-sealing slice; 72-a welding tab;
8-step.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
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.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to fig. 1 to 13, but the present invention is not limited thereto.
Implementation mode one
The first embodiment will be described with reference to the accompanying drawings 1 to 4
The pole welding structure of the square steel shell battery comprises a first pole 1; a second pole 2; the bottom of first utmost point post 1 is provided with the through hole 3 that matches with second utmost point post 2, and second utmost point post 2 passes through hole 3 and with first utmost point post 1 fixed connection, and the bottom of second utmost point post 2 is provided with extension 21, extension 21 and utmost point ear crowd fixed connection.
Because the tab is welded on the pole by using laser from the inside in the welding of the prior structure, then the cell is turned over and is put into the shell, the tab group is easy to be pulled and broken in the shell, which leads to electric connection failure, therefore, the pole is divided into two parts, the outer ring of the first pole 1 is sleeved with a sealing insulating material, the middle of the first pole 1 is provided with a through hole 3, the second pole 2 can be put into the through hole 3 of the first pole 1, and the extension part 21 is added, which is convenient for laser welding the second pole 2 and the tab group together, namely, the second pole 2 and the tab group are firstly laser welded together and then put into the shell, which reduces the bending times of the tab, and the tab is not required to be turned over and put into the shell, thereby preventing the tab from being damaged due to repeated bending and breaking of thin foil when the tab is welded internally, wherein, the first pole 1 and the second pole 2 adopt the external laser welding mode, the welding position is located the top of utmost point post, has saved and has welded a layer of gasket outside welding seal again to prevent that the welding position of utmost point ear welding department from appearing welding and wearing and leading to the battery weeping inefficacy, help reduction in production cost.
In the basis the utility model discloses an among the utmost point post welded structure of square steel shell battery, extension 21 encircles the bottom setting of second utmost point post 2, and second utmost point post 2 and extension 21 form T type structure. Specifically, the aluminum tab is laser welded on the second pole 2 with a T-shaped structure, and the welding point of the tab is the large end face of the T-shaped second pole 2.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, first utmost point post 1 and second utmost point post 2 pass through laser welding fixed connection, and the welding mode is seam welding or pierces through the welding.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, the terminal surface of second utmost point post 2 is circular, square or rectangle, and the terminal surface of extension 21 is circular, oval-shaped, square or rectangle. Specifically, the second pole 2 is divided into two parts, one part is arranged in the through hole 3 in a penetrating mode, the end face of the part is small and can be in a shape of a perfect circle, a square or a rectangle, preferably, the end face of the part is a perfect circle, the other part is exposed below the first pole 1, the end face of the part is large and can be in a shape of a perfect circle, a square or a rectangle.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, the external diameter of second utmost point post 2 equals the internal diameter of through hole 3, through precision finishing, can reduce clearance between the two, makes both closely assemble, simultaneously, adopts outside laser welding's mode, with first utmost point post 1 and the welding of second utmost point post 2 together, helps improving the welding effect.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, the outer wall of first utmost point post 1 is provided with concave part 11, and concave part 11 encircles the outer wall setting of first utmost point post 1, and concave part 11 is used for imbedding the sealing member 5 of being connected with 7 lateral walls of casing, and in this embodiment, concave part 11 plays and carries out spacing effect to sealing member 5, prevents that sealing member 5 from taking place the displacement or rocking, and wherein, the whole I-shaped structure that is in first utmost point post 1's outside. The sealing member 5 plays a role of insulating the first pole 1 and the cover plate 6, and simultaneously clamps the first pole 1 at the mounting opening of the cover plate 6.
A battery including a cap plate 6; a housing 7 provided with an opening; the battery cell is accommodated in the shell 7; and as above-mentioned square steel-shelled battery's utmost point post welded structure, utmost point post welded structure and casing 7 lateral wall fixed connection, apron 6 is fixed in the opening, and apron 6 is used for sealing electric core in casing 7.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, electric core includes positive plate, barrier film and negative pole piece, and positive plate, barrier film and negative pole piece form electric core through convoluteing, and the terminal surface of electric core is provided with utmost point ear. Specifically, the positive plate, the negative plate and the isolation film are wound into a roll core by winding, positive and negative electrode tabs are led out from the end face of the roll core, the positive and negative electrode tabs are respectively an aluminum strip and a nickel strip (copper strip and copper nickel-plated strip), the positive and negative electrode tabs are welded on the empty foil on the corresponding pole piece by ultrasonic welding, and the non-welding point of the aluminum strip is subjected to insulation treatment by adopting a treatment mode including but not limited to thermal composite PP glue, and insulation adhesive paper, coating insulation adhesive and the like.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, the edge of apron 6 is provided with step 8, through laser welding fixed connection between casing 7 and the apron 6. Specifically, the opening is provided with step 8, can arrange the location with apron 6, with laser with casing 7 and apron 6 welding together, wherein, the shape of step 8's cross-section can be designed for squarely, such as square, rectangle or other irregular shape, step 8 is established at apron 6 edge, step 8's thickness is less than the thickness of apron 6's body slightly, form the structure of similar step with apron 6's body, make apron 6's body directly imbed the opening, during the welding, apply pressure slightly, can guarantee two parts in close contact with, help reducing clearance between them, can not take place to shift yet and lead to the edge can not align, make the battery have good leakproofness.
According to the utility model discloses an among the utmost point post welded structure of square steel shell battery, casing 7 lateral wall is provided with annotates liquid mouth 71 and welding piece 72, annotates liquid mouth 71 and installs sealing piece 711, and apron 6 is provided with explosion-proof nick 61, and casing 7 is connected to welding piece 72, can regard as the negative pole. Wherein, apron 6 is earlier with a semicircle of laser etching, as explosion-proof nick 61, has explosion-proof effect, and when the battery safety problem appeared, produce a large amount of gas and lead to the internal pressure to sharply increase, and the nick here can be broken through to pressure, and discharge pressure plays the relief valve effect, prevents the further thermal runaway of battery. The lateral wall of the shell 7 is provided with a liquid injection port 71, the liquid injection port is sealed by a sealing nail, the sealing nail is removed after formation, air is exhausted, a laser welding mode is adopted, a round stainless steel sheet is welded on the liquid injection port 71 to play a role in sealing the liquid injection hole, and then the battery is prepared through standing after subsequent liquid injection, formation, capacity grading and OCV testing.
The utility model discloses a theory of operation is:
put into casing 7 with electric core, with the synchronous embedding of second utmost point post 2 in the through hole 3 of first utmost point post 1, wherein, first utmost point post 1 is hollow structure, with the anchor clamps centre gripping, guarantee first utmost point post 1 and the 2 in close contact with of second utmost point post, in casing 7 outsidely, with the welding of laser with the clearance department of first utmost point post 1 and second utmost point post 2 together, because of laser welding position fusion welding, can guarantee the welding effect, utmost point ear adopts the anchor clamps centre gripping to compress tightly on casing 7, also adopts outside laser welding's mode to weld on casing 7.
Second embodiment
The positive plate, the negative plate and the isolating film are stacked into a stacked core through lamination, and the positive and negative electrode tab groups are led out from the end face of the rolled core.
The positive and negative pole lug groups are respectively welded together to be used as lugs, or the positive pole lug group can be switched to an aluminum belt, and the copper lug group is switched to a nickel belt or a copper nickel plating belt. And (3) carrying out insulation treatment on non-welding points of the aluminum tabs, wherein the treatment mode comprises but is not limited to thermal compounding of PP glue, application of insulating adhesive paper, coating of insulating glue and the like.
The aluminum lug is welded on the second pole 2 of the T-shaped structure by laser, and the welding point of the lug is the large end face of the T-shaped second pole 2.
The outer ring of the first pole 1 is sleeved with a sealing insulating material, and the middle part is provided with a circular through hole 3. The second pole column 2 is a cylinder with a T-shaped structure and can be placed in the through hole 3 of the first pole column 1. The machining precision of the circular hole of the first pole column 1 and the small cylinder of the second cylinder 2 is controlled, the gap between the first pole column and the second pole column is reduced, the first pole column and the second pole column are tightly assembled, the mode of external laser welding is adopted, the first pole column and the second pole column are welded together, the welding effect is improved, the second pole column 2 and the pole lug group are welded together in a laser mode, then the pole lug is placed in a shell, the bending times of the pole lug are reduced, and the pole lug does not need to be turned over and placed in the shell.
Put into casing 7 with electric core, with the synchronous embedding of second utmost point post 2 in the through hole 3 of first utmost point post 1, wherein first utmost point post 1 is hollow structure, with the anchor clamps centre gripping, guarantees first utmost point post 1 and second utmost point post 2 in close contact with, and at casing 7 outsides, with the welding of laser with the clearance department of first utmost point post 1 and second utmost point post 2 together, because of laser welding position fusion welding, can guarantee the welding effect. The negative pole utmost point ear adopts anchor clamps centre gripping to compress tightly on the shell, also adopts outside laser welding's mode to weld on the casing.
Opening and 6 edges of apron all are provided with the step 8, fix a position with 6 collocation of apron, with laser with casing 7 and 6 welding of apron together, wherein, 6 semicircle of earlier with laser etching of apron, as explosion-proof nick 61, have explosion-proof effect, when the battery safety problem appears, produce a large amount of gas and lead to the internal pressure surge, the nick at here can be broken to pressure, discharge pressure plays the relief valve effect, prevents the further thermal runaway of battery.
Specifically, the edge of opening and apron 6 all is provided with step 8, and the shape of the cross-section of step 8 can be designed for squarely, like square, rectangle, triangle-shaped or other irregular shapes, the shape of the step 8 of opening and apron 6 mutually supports, is convenient for fix a position and laser welding, and the face of weld of apron 6 and casing 7 is the horizontal direction, and the welding seam also is the horizontal direction, can get rid of the influence of gravity, makes the welding seam even, and welding quality is good, promotes the welding effect.
The lateral wall of the shell 7 is provided with a liquid injection port 71, the liquid injection port is sealed by a sealing nail, the sealing nail is removed after formation, air is exhausted, a circular stainless steel sheet is welded on the liquid injection port 71 by laser welding, and a liquid injection hole is sealed.
And standing after subsequent liquid injection, forming, grading, testing OCV and the like to obtain the battery.
Third embodiment
The positive plate, the negative plate and the isolating film are wound into a winding core through winding, and the positive and negative electrode tabs are led out from the end face of the winding core.
The positive and negative electrode tabs are respectively aluminum strips and nickel strips (copper strips and copper nickel-plated strips), and are welded on the hollow foils on the corresponding pole pieces by ultrasonic welding. And (3) insulating non-welding points of the aluminum strip by using a method including but not limited to thermal compounding of PP glue, insulating gummed paper, coating of insulating glue and the like.
And welding the aluminum lug on the second pole 2 of the T-shaped structure by using laser, wherein the welding point of the lug is the large end surface of the T-shaped second pole 2.
The inside fretwork of first utmost point post 1, the fretwork position is the cylinder, need the welded inside bottom to be very thin, second cylinder 2 is the cylinder of T type structure, the inside fretwork department of first utmost point post 1 can be put into to the small cylinder of second cylinder 2, both closely cooperate, adopt two parts of outside laser welding, because inside is the small cylinder, there is certain thickness, weld the inner wall bottom of first cylinder 1 at most, do not worry to weld the department of seal and inside link up and the weeping, can be in the same place second utmost point post and utmost point ear crowd laser welding earlier, go into the shell again, reduce the number of times of buckling of utmost point ear, also need not turn over a income shell.
Put into casing 7 with electric core, in the blind hole 4 with the first utmost point post of 2 synchronous imbeds of second utmost point post 1, wherein first utmost point post 1 is inside hollow out construction, with the anchor clamps centre gripping, guarantee the little terminal surface of the second utmost point post 2 of T type structure and the 1 inner wall bottom in close contact with of first utmost point post, in the casing 7 outside, weld the inner wall bottom surface of first utmost point post 1 and the little terminal surface of second utmost point post 2 with laser, because first utmost point post 1 bottom can be done thinly, laser can pierce through, with first utmost point post 1 and 2 welding of second utmost point post together, because second utmost point post 2 is very thick, even first utmost point post 1 welds and pierces, can not weld second utmost point post 2 yet, thereby welded leakproofness has been guaranteed. The negative pole tab is clamped and pressed on the shell by a clamp and is welded on the shell 7 by external laser welding.
The opening of casing 7 sets up step 8, and apron 6 collocation location, is in the same place casing 7 and 6 welding of apron with laser, and wherein, apron 6 is earlier with semicircle of laser etching, as explosion-proof nick 61, has explosion-proof effect, when the battery safety problem appears, produces a large amount of gas and leads to the internal pressure surge, and the nick here can be broken through to pressure, and discharge pressure plays the relief valve effect, prevents the further thermal runaway of battery.
Specifically, the opening is provided with the step 8, the shape of the cross section of the step 8 can be designed to be square, such as square, rectangle or other irregular shapes, the step 8 is arranged at the edge of the opening, the thickness of the step 8 is slightly smaller than that of the side edge of the opening, and a structure similar to the step is formed with the edge of the opening, so that the cover plate 6 is directly embedded into the opening, when welding is carried out, slight pressure is applied, the two parts can be ensured to be in close contact, the gap between the two parts can be reduced, the phenomenon that the edge cannot be aligned due to displacement can not occur, and the battery has good sealing performance.
The lateral wall of the shell 7 is provided with a liquid injection port 71, the liquid injection port is sealed by a sealing nail, the sealing nail is removed after formation, air is exhausted, a circular stainless steel sheet is welded on the liquid injection port 71 by laser welding, and a liquid injection hole is sealed.
And standing after subsequent liquid injection, forming, grading, testing OCV and the like to obtain the battery.
Embodiment IV
The positive plate, the negative plate and the isolating film are stacked into a battery cell through lamination, and the positive and negative electrode tab groups are led out from the end face of the winding core.
The positive and negative pole lug groups are respectively welded together to be used as lugs, or the positive pole lug group can be switched to an aluminum belt, and the copper lug group is switched to a nickel belt or a copper nickel plating belt. And (3) carrying out insulation treatment on non-welding points of the aluminum tabs, wherein the treatment mode comprises but is not limited to thermal compounding of PP glue, application of insulating adhesive paper, coating of insulating glue and the like.
And welding the aluminum lug on the second pole 2 of the T-shaped structure by using laser, wherein the welding point of the lug is the large end surface of the T-shaped second pole 2.
The inside fretwork of first utmost point post 1, the fretwork position is the cylinder, need the welded inside bottom to be very thin, second cylinder 2 is the cylinder of T type structure, the inside fretwork department of first utmost point post 1 can be put into to the small cylinder of second cylinder 2, both closely cooperate, adopt two parts of outside laser welding, because inside is the small cylinder, there is certain thickness, weld the inner wall bottom of first cylinder 1 at most, do not worry to weld the department of seal and inside link up and the weeping, can be in the same place second utmost point post 2 and utmost point ear crowd laser welding earlier, go into the shell again, reduce the number of times of buckling of utmost point ear, also need not turn over a income shell.
Put into casing 7 with electric core, in the blind hole 4 with the first utmost point post of 2 synchronous imbeds of second utmost point post 1, wherein first utmost point post 1 is inside hollow out construction, with the anchor clamps centre gripping, guarantee the little terminal surface of the second utmost point post 2 of T type structure and the 1 inner wall bottom in close contact with of first utmost point post, in the casing 7 outside, weld the inner wall bottom surface of first utmost point post 1 and the little terminal surface of second utmost point post 2 with laser, because first utmost point post 1 bottom can be done thinly, laser can pierce through, with first utmost point post 1 and 2 welding of second utmost point post together, because second utmost point post 2 is very thick, even first utmost point post 1 welds and pierces, can not weld second utmost point post 2 yet, thereby welded leakproofness has been guaranteed. The negative pole tab is clamped and pressed on the shell by a clamp and is welded on the shell 7 by external laser welding.
The opening of casing 7 sets up step 8, and the location of 6 collocation of apron, with laser with casing 7 and 6 welding of apron together, wherein, apron 6 is earlier with semicircle of laser etching, as explosion-proof nick 61, has explosion-proof effect, when the battery safety problem appears, produces a large amount of gas and leads to the internal pressure surge, the nick here can be broken to pressure, discharge pressure plays the relief valve effect, prevents the further thermal runaway of battery.
Specifically, the cross-section of the step 8 is triangular in shape.
The lateral wall of the shell 7 is provided with a liquid injection port 71, the liquid injection port is sealed by a sealing nail, the sealing nail is removed after formation, air is exhausted, a circular stainless steel sheet is welded on the liquid injection port 71 by laser welding, and a liquid injection hole is sealed.
And standing after subsequent liquid injection, forming, grading, testing OCV and the like to obtain the battery.
Fifth embodiment
In the present embodiment, the cover plate 6 is positioned on one of the side walls of the case 7, and the cover plate 6 is provided with a post welding structure, a pouring port 71, and a welding piece 72.
Sixth embodiment
In the present embodiment, the cover plate 6 is located on one of the side walls of the case 7, the cover plate 6 has no component, and the post welding structure, the pour opening 71, and the welding piece 72 are all located on the other side wall of the case 7.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a utmost point post welded structure of square steel-shelled battery which characterized in that includes:
a first pole (1);
a second pole (2);
the bottom of first utmost point post (1) be provided with through hole (3) or blind hole (4) that second utmost point post (2) match, second utmost point post (2) pass through hole (3) or blind hole (4) and with first utmost point post (1) fixed connection, the bottom of second utmost point post (2) is provided with extension (21), extension (21) and the utmost point ear fixed connection of battery.
2. The pole welding structure of the square steel-shell battery of claim 1, characterized in that: the extension part (21) surrounds the bottom of the second pole column (2), and the second pole column (2) and the extension part (21) form a T-shaped structure.
3. The pole welding structure of the square steel-shell battery of claim 1, characterized in that: the first pole column (1) and the second pole column (2) are fixedly connected through laser welding, and the welding mode is seam welding or penetration welding.
4. The pole welding structure of the square steel-shell battery of claim 1, characterized in that: the terminal surface of second utmost point post (2) is circular, square or rectangle, the terminal surface of extension (21) is circular, oval-shaped, square or rectangle.
5. The pole welding structure of the square steel-shell battery of claim 1, characterized in that: the outer diameter of the second pole (2) is equal to the inner diameter of the through hole (3) or the blind hole (4).
6. The pole welding structure of the square steel-shell battery of claim 1, characterized in that: the outer wall of the first pole column (1) is provided with a concave portion (11), the concave portion (11) surrounds the outer wall of the first pole column (1), and the concave portion (11) is used for being embedded into a sealing piece (5) connected with the side wall of the shell (7).
7. A battery, comprising:
a cover plate (6);
a housing (7) provided with an opening;
the battery cell is accommodated in the shell (7); and
the post welding structure of the square steel shell battery as claimed in any one of claims 1 to 6, wherein the post welding structure is fixedly connected with the side wall of the casing (7), the cover plate (6) is fixed at the opening, and the cover plate (6) is used for sealing the battery cell in the casing (7).
8. A battery as in claim 7, wherein: the battery cell comprises a positive plate, an isolation film and a negative plate, wherein the positive plate, the isolation film and the negative plate are formed by stacking or winding the battery cell, and the end face of the battery cell is provided with a tab.
9. A battery as in claim 7, wherein: the edge of the opening or the cover plate (6) is provided with a step (8), and the shell (7) and the cover plate (6) are fixedly connected through laser welding.
10. A battery as in claim 7, wherein: casing (7) lateral wall is provided with annotates liquid mouth (71), annotate liquid mouth (71) and install sealing strip (711), apron (6) are provided with explosion-proof nick (61).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114552086A (en) * | 2021-11-11 | 2022-05-27 | 东莞锂微电子科技有限公司 | Pole welding structure of square steel shell battery and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114552086A (en) * | 2021-11-11 | 2022-05-27 | 东莞锂微电子科技有限公司 | Pole welding structure of square steel shell battery and battery |
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