CN109904380A - A kind of circle high power lithium ion cell structure and preparation method thereof - Google Patents
A kind of circle high power lithium ion cell structure and preparation method thereof Download PDFInfo
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- CN109904380A CN109904380A CN201910230589.7A CN201910230589A CN109904380A CN 109904380 A CN109904380 A CN 109904380A CN 201910230589 A CN201910230589 A CN 201910230589A CN 109904380 A CN109904380 A CN 109904380A
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The present invention relates to a kind of round high power lithium ion cell structures and preparation method thereof.Anode and cathode terminals by being all made of " full extreme ear structure " by the present invention, to carry out the storage and release of battery core internal energy, and between anode and cathode terminals and shell, it has been all made of " face domain laser welding " (electric welding of unconventional lithium ion battery), has effectively held stream (electric current transmitting) ability between battery plus-negative plate terminal, shell to ensure.In addition, the side that negative terminal is combined with battery case is provided with " protrusion ", play the role of blocking slag, the slag generated in laser beam welding can be avoided to be splashed in terminal plane, effectively further to ensure the reliability of outside batteries connection relationship.Compared to traditional cylindrical lithium ion battery, without increasing the number of fitting parts of extra quantity when the implementation of the method for the present invention, structurally reasonable, simple process is conducive to the large-scale promotion application in commercially producing.
Description
Technical field
The present invention relates to technical field of lithium ion, especially a kind of round high power lithium ion cell structure and its system
Preparation Method.
Background technique
As the key core building block of New Energy Industry, lithium ion battery because its energy density height, memory-less effect,
It has extended cycle life, the advantages such as voltage range is wide, becomes battery of new generation high in technological content now, that purposes is wide, claimed by people
Be " most promising energy storage device ".Especially its energy density performance for can reach 300Wh/kg or more, will greatly prolong
" course continuation mileage " of long energy-storage system, further satisfaction " course continuation mileage " and the balancing effect between " charging time " are promoted " green
The convenience that color ", " intelligence " are gone on a journey.Currently, the development of lithium ion battery is concentrated mainly on three state, China, Japan and Korea, especially
China, in country under the support energetically of electric car policy, lithium ion battery industry chain is rapidly promoted with industrialization level, shape
At the market structure with World Developed Countries " three points of world ".In general, lithium ion battery has square metal shell, cylindrical gold
Belong to three kinds of shell, flexible package aluminum plastic film packaged forms.Due to cylinder row shell have high degree of automation, good product consistency,
Various advantages such as production cost is low, have become the Typical Representative in motive-power battery field, have also made Just because of this
New-energy automobile factory using headed by tesla, the U.S. selects cylinder row shell lithium battery as electrical source of power.
Currently, since the principal concern of lithium ion battery industry all concentrates on being promoted the energy density side of lithium battery product
Face, and to the concern in terms of the improvement of lithium battery product power density (namely high power, heavy-current discharge performance) and study still
There are shortcomings, and result in lithium ion battery and battery-heating, on fire, course continuation mileage easily occur not in actually charging application process
Foot, safety accidents problem even on fire from explosion etc. are not improved and are solved.Such as application No. is CN201521141644.9
The referred to as patent of " a kind of lithium battery cap and lithium battery ", the negative terminal of battery between interior of shell, with shell,
Being electrically connected between positive terminal and positive nut cap is all a connection, and electric current transmitting is transmitted by point-to-point contact, thus can not
Adapt to the conveying of high current.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the above-mentioned prior art, the present invention provides a kind of ultra high power cylindrical lithium ion cells
Pool structure and preparation method thereof can effectively solve the problem that lithium ion battery in the fever of heavy-current discharge process, course continuation mileage deficiency, longevity
Order it is short, even explosion on fire the problems such as.The structurally reasonable of lithium ion battery of the present invention, its preparation process are simple, are conducive in work
Industry metaplasia is promoted and applied in producing.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
The present invention provides a kind of round high power lithium ion cell structures comprising:
Battery case, positive terminal, positive nut cap, negative terminal, battery core, positive insulating trip；
Wherein, the cylindrical steel that the shape of the battery case is integrally formed, the outer diameter of the battery case are 18-
40mm, the inside of the battery case be it is hollow, the top of the battery case has opening, and the bottom of the battery case is set
It is equipped with circle protection protrusion, the diameter of the protection protrusion is 13-25mm, width 2-3mm, is highly 0.2-0.3mm；Institute
It states battery case bottom and is located at the Laser Welding contact that the position in protection protrusion outside is 0.1-1mm equipped with a loop diameter,
The position that the battery case bottom is located at protection protrusion inside is provided with the laser welding that a loop diameter is 0.1-0.5mm
Point；
Wherein, the positive terminal generally " dumbbell shape " structure, the one end connecting with battery core side of the positive electrode are circular piece
Body, diameter 12-26mm, it is 2-6mm circular hollow slot that centre, which is equipped with a diameter,；
The other end that the positive terminal connect with positive nut cap is width 8-22mm, the polygon of length 5-10mm or
Fillet rectangle or ellipse；The both ends of the positive terminal are connected with elongated sheet body, the elongated sheet body of positive terminal
Length is 10-15mm；Positive terminal with a thickness of 0.1-0.3mm；
The rounded sheet body of negative terminal, outer diameter 15-29mm, being equipped with width in negative terminal surface is 3.5-5mm
Contact projection, the two sides of contact projection are platform part；The height of the negative terminal is 0.2-0.6mm, middle part is equipped with one
Diameter is the hollow circle of 2-5mm；The negative terminal platform part with a thickness of 0.1-0.3mm；
The battery core is single battery core, and is the exposed battery core of both ends collector；
The battery core negative side is electrically connected with battery case bottom by the negative terminal, and wherein: the negative pole end
Son is electrically connected with contact projection with the battery core negative side, is electrically connected with its platform part with the battery case bottom；
The battery core side of the positive electrode is electrically connected with the positive nut cap by the positive terminal, and the anode insulating trip is set to
Insulation system is formed between the positive terminal and the battery case.
In a preferred embodiment of the present invention, the positive and negative pole surface parallel deviation of the battery core is less than or equal to 0.2mm.
In a preferred embodiment of the present invention, the hollow type gasket that the positive insulating trip is thickness 0.05-0.2mm,
And vertically there is the extension side of 2-4mm in edge.
In a preferred embodiment of the present invention, (including battery case and the cathode of the electrical joint between the component
Between terminal, between positive terminal and positive nut cap, between anode and cathode terminals and battery core positive and negative anodes) it is all made of Laser Welding in succession
It connects.
In a preferred embodiment of the present invention, the positive terminal is made of high-purity aluminium flake, and negative terminal is using high
Pure nickel piece is made.
In a preferred embodiment of the present invention, the positive insulating trip uses polytetrafluoroethylene (PTFE) material.
In a preferred embodiment of the present invention, the hollow portion (battery of the battery case, positive terminal, negative terminal
The top opening of shell, the circular hollow slot of positive terminal, negative terminal hollow circle) position along the respective center of circle be in center line pair
Claim, to ensure product quality.
In a preferred embodiment of the present invention, the positive nut cap base diameter is 6.5-12.5mm；
The present invention also provides a kind of round high power lithium ion cell preparation methods comprising step:
The seamless non-porous cylindrical cell external case in bottom is made in S1, selection steel, punching press, while in the bottom of battery case
It is stamped and formed out the protection protrusion, the battery case as described in above-mentioned any embodiment is made；
S2, positive terminal and negative terminal as described in above-mentioned any embodiment are stamped and formed out；
S3, negative terminal is placed and secured in battery core negative side, is recessed by the back side of contact projection and determines Laser Welding
Integrate with mark, carries out laser welding along the edge of the recess of the contact projection back side using laser, then places positive terminal
In battery core side of the positive electrode, the one end for being connect the positive terminal with battery core using laser and the battery core side of the positive electrode are using Laser Welding
It connects；
S4, the above-mentioned battery core connected is put into battery case, it is convex by protecting after fixing battery core and battery case
It rises and determines laser welding track, the laser welding point using laser along the interior outside of the protection protrusion carries out laser welding, makes
Battery case is electrically connected with negative terminal realization；
S5, the other end of the positive terminal and positive nut cap progress laser welding are fixed.
Preferably, the laser welding is to carry out laser welding using surface-to-surface, that is, uses intensive laser welding spot welding
It connects, with formation " connection of face domain ".
Preferably, the position that the negative terminal and battery case bottom are correspondingly connected with is equipped with and prevents in laser beam welding
It generates slag and is splashed to the protrusion in negative terminal plane, further to ensure the reliability and accuracy of connection relationship.
Preferably, the connection of different inter-modules is using laser welding in step S3-S5.The laser welding is
Laser welding is carried out using surface-to-surface, i.e., is welded using intensive laser welding point, with formation " connection of face domain ", the company of raising
Effectively hold stream ability in socket part position.
(3) beneficial effect
The beneficial effects of the present invention are:
A kind of round high power lithium ion cell structure of the invention and preparation method thereof, is all made of by anode and cathode terminals
" structure of Quan Jier ", the storage and release of the energy inside Lai Jinhang battery core.Especially negative terminal and battery case it
Between connected using tab formula, ensured and effectively held stream ability between negative terminal and casing part.
Further, all electrical joints (especially between negative terminal and battery case) use " face domain laser
Welding " (rather than electric welding of conventional lithium ion battery), to further ensure between negative terminal and casing part
Effectively hold stream (electric current transmitting) ability.
It is produced in addition, " boss " of negative terminal and outer casing bottom connecting portion can be effectively prevented from laser beam welding
Raw slag is splashed on negative terminal region, and then can further ensure the reliability of the connection relationship of outside batteries.
In laser beam welding, the protection protrusion of battery case bottom also helps the track for being accurately determined laser welding.
Compared to traditional cylindrical lithium ion battery, method of the invention implement without increase extra quantity with number of packages
Amount, battery reasonable integral structure, simple process are conducive to the large-scale promotion application in commercially producing.
Detailed description of the invention
Fig. 1 is the main view, bottom view and its negative pole end of one specific embodiment shell of lithium ion battery of the invention
Partial enlarged view；
Fig. 2 is one specific embodiment positive terminal of lithium ion battery of the invention；
Fig. 3 A- Fig. 3 B be one specific embodiment negative terminal of ultra high power lithium ion battery of the invention top view and
Sectional view；
Fig. 4 A- Fig. 4 B is the top view and sectional view of the positive insulating trip of ultra high power lithium ion battery of the invention；
Fig. 5 is the exposed single battery core schematic diagram of the both ends collector of ultra high power lithium ion battery of the invention；
Top view, the side section of positive nut cap (after combining positive insulating trip) top surface are followed successively by as shown in Fig. 6 A, 6B, 6C
The bottom view of figure and bottom surface.
Fig. 7 is the welding position schematic diagram of ultra high power lithium ion battery positive terminal and battery core of the invention；
Fig. 8 is the welding position schematic diagram of ultra high power lithium ion battery positive terminal and positive nut cap of the invention；
Fig. 9 is the welding position schematic diagram of ultra high power negative electrode for lithium ion battery terminal and shell cathode of the invention；
Figure 10 is the welding position schematic diagram of ultra high power negative electrode for lithium ion battery terminal and battery core of the invention；
Figure 11 A, Figure 11 B are the structural schematic diagram after ultra high power lithium ion battery welding combination of the invention.
[description of symbols]
10: battery case；11: protection protrusion；20: positive terminal；21: positive nut cap；
22: positive insulating trip；221: extending side；220: circular hole；200A hollow groove；30: negative terminal；31: negative with battery core
The contact projection of pole side connection；32: hollow circle；20C: elongated sheet body；40: battery core；400: positive terminal and battery core anode weld
Area；410: negative terminal and battery case cathode welding section；420: negative terminal and battery core cathode welding section.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Referring to Fig. 1-Fig. 6, a kind of lithium ion battery of the invention, mainly to high-power cylindrical lithium ion battery
The improvement of positive and negative electrode terminal (20,30) deriving structure, lithium ion battery structure of the invention mainly include battery case 10,
Positive terminal 20, positive nut cap 21, negative terminal 30, battery core 40, positive insulating trip 22.
Wherein, as shown in Figure 1, the cylindrical steel that the shape of battery case 10 described in this specific embodiment is integrally formed
Shell, the outer diameter of the battery case are 18-40mm, and the inside of the battery case 10 is hollow, the top tool of battery case 10
There is an opening, the bottom of the battery case 10 is provided with circle protection protrusion 11, and the outside diameter of the protection protrusion 11 is
The width of 13-25mm, protection protrusion 11 are 2-3mm, are highly 0.2-0.3mm.In this embodiment, 10 bottom of battery case
The chamfering that portion protects raised 11 end face two sides and 10 edge of battery case to have about 45 degree, a length of 0.5-3mm of bevel edge.
The position that battery case 10 is located at 11 outside of protection protrusion is provided with the Laser Welding contact that a loop diameter is 0.1-1mm, electricity
The position that pond shell 10 is located at 11 inside of protection protrusion is again provided with a circle Laser Welding contact, and laser welding spot diameter is
0.1-0.5mm。
Wherein, as shown in Fig. 2, generally " dumbbell shape " structure of the positive terminal 20, one end 20A being connect with battery core
Outer diameter be 12-26mm, among it have a circular hollow groove 200A, diameter 4-6mm, in this specific embodiment
In, hollow groove 200A is set as through-hole.One end 20B that positive terminal 20 is connected with positive nut cap 21 is width 8-22mm, length
The polygon or track type of 5-10mm are spent, centre can set the circular hole 200B of 2-5mm.Between both ends 20A, 20B of positive terminal 20
It is connected with elongated sheet body 20C, the length is 10-15mm, the positive terminal is with a thickness of 0.1-0.3mm.The positive terminal 20
It can be bent or be folded by the elongated sheet body 20C.
Be followed successively by as shown in Fig. 6 A, 6B, 6C positive nut cap 21 (after combining positive insulating trip 22) top surface top view,
The bottom view of sectional side view and bottom surface.Positive 21 base diameter of nut cap is 6.5-12.5mm, has and carries out with positive terminal 20
The interconnecting piece of electric connection, and for the lug boss of anode output, related anode nut cap 21 can be according to prior art specification
Design.
As shown in Fig. 3 A- Fig. 3 B, the negative terminal 30 is rounded sheet body, and the outer diameter of the negative terminal 30 is 15-
29mm, surface are equipped with the contact projection 31 that width is 3.5-5mm, relatively, the position definition of non-protrusion on negative terminal 30
For platform part.The whole height of negative terminal 30 be 0.2-0.6mm, among 30 surface of negative terminal exist a diameter be 2-
The hollow circle 32 (grout hole of corresponding battery core) of 5mm.Preferably, negative terminal 30 is with a thickness of 0.1-0.3mm.In some specific realities
It applies in example, high-purity aluminium flake can be used in positive terminal 20, and high-purity nickel sheet can be selected in negative terminal 30.
It as shown in figure 5, battery core 40 is single battery core, and is the exposed battery core of both ends collector, the battery core positive and negative anodes side table
Face parallel deviation is less than or equal to 0.2mm.
As shown in figs. 4 a-4b, the hollow type (there is circular hole 220 in centre) that positive insulating trip 22 is thickness 0.05-0.2mm pads
Piece, and vertically there is the extension side 221 of 2-4mm in edge.In this specific embodiment, which is adopted
Use polytetrafluoroethylene (PTFE) material.
In order to ensure the quality of product, in this embodiment, the opening of the battery case 10, positive terminal 20,
The hollow part of negative terminal 30 need to be in center line symmetrical setting along the respective center of circle, and the electrical connection between any two different components
It is using " face domain " laser welding.
The present invention also provides a kind of preparation methods of the round high power lithium ion cell of above structure, including walk as follows
It is rapid:
(1), steel are selected, the seamless non-porous cylindrical cell external case 10 in bottom is made in punching press；
(2), protection protrusion 11 is stamped and formed out in the bottom of battery case 10；
(3), punching press positive terminal 20, negative terminal 30；
(4), negative terminal 30 is placed and secured in 40 negative side of battery core, at this time the upper surface of contact projection 31 and electricity
It is closely abutted between the negative side of core 40, is herein position to be welded, it is then negative along negative terminal 30 and battery core 40 using laser
Laser welding is carried out at the outer side seam gap of pole side, then positive terminal 20 is placed in the side of the positive electrode of battery core 40, using same
Welding manner, the plus plate current-collecting body of one end 20A of positive terminal 20 and battery core 40 is used into laser welding.Referring to Figure 10's
Schematic diagram.
Wherein the back side of the contact projection 31 of negative terminal 30 is corresponding depressed area, which facilitates laser
The track of welding is precisely located when welding.
(5), and then, the above-mentioned battery core 40 connected is put into battery case 10, fixes battery core 40 and shell 10
Afterwards, at this point, the platform part of negative terminal 30 is contacted with the bottom of battery case 10, battery case 10 is acted on using laser equipment
The laser welding point of raised 11 medial and lateral of the protection of bottom is welded, so that battery case 10 and negative terminal 30 are connected, it can
Referring to the welding position schematic diagram of Fig. 9.
The protection protrusion 11 of battery case 10 and the contact projection 31 of negative terminal 30, the two are not required in complete correspondence, only
Need between negative terminal 30 and battery case 10 there are contact surfaces can be (referring to the assembling figure of Figure 11 A and Figure 11 B).Because of negative pole end
The area of son 30 and the contact site of battery case 10 is greater than the area that battery case 10 protects 11 outside left of boss, at this point,
Contact from external observation to protection protrusion 11 seat, be accurately positioned welding track, and by setting laser welding track,
It can realize laser welding.
Protection boss 11 is set in 10 bottom outside of battery case, accurate positioning when helping to carry out laser welding from outside
The track of laser welding.Negative terminal 30 is the molding of metal material integrated punching, has certain elasticity, be installed to battery core 40 with
When between battery case 10, by certain tooling, 31 two sides of contact projection 31 and contact projection of negative terminal 30 can be made
Platform part can be in then to contact laser welding apparatus, realize battery core negative side and cathode tight against contacting with battery core 40, battery case 10
It welds in the face domain of surface-to-surface contact between terminal 30, negative terminal 30 and battery case 10.
(6), finally, the other end 20B of positive terminal 20 to be fixed and swash with positive nut cap 21, positive insulating trip 22
Photocoagulation.Positive insulating trip 22 separates battery case 10 and positive terminal 20, avoids battery short circuit.
1A- Figure 11 B referring to Figure 1, for schematic diagram after each component welding combination of ultra high power lithium ion battery of the invention.
Stain or shadow part are welding track in figure.
It is that non-biography is replaced using " face domain laser welding " for the laser welding in this specific embodiment referring to Fig. 7-Figure 10
The electric welding (generally spot welding) of the lithium ion battery of system.So-called face domain laser welding is exactly that laser welding, tool are carried out with surface-to-surface
Very intensive laser welding spot welding can be used in body, with the connection of forming face domain.
In Fig. 7-10, label 400 is one end 20A of positive terminal 20 and the Mian Yu laser welding area of battery core 40, label
410 be one end 20B of positive terminal 20 and the Mian Yu laser welding area of positive nut cap 21, and label 430 is negative terminal 30 and electricity
The Mian Yu laser welding area of 10 bottom of pond shell, label 420 are the face domain Laser Welding of the negative side of negative terminal 30 and battery core 40
Meet area.
A kind of lithium ion battery structure proposed by the invention and preparation method thereof is suitably adapted for the lithium of all cylindrical bodies
Battery, especially high power lithium ion cell, such as 186 and 237 series.
Claims (10)
1. a kind of circle high power lithium ion cell structure, characterized in that it comprises:
Battery case, positive terminal, positive nut cap, negative terminal, battery core, positive insulating trip；
Wherein, the cylindrical steel that the shape of the battery case is integrally formed, the outer diameter of the battery case are 18-
40mm, the inside of the battery case be it is hollow, the top of the battery case has opening, and the bottom of the battery case is set
It is equipped with circle protection protrusion, the diameter of the protection protrusion is 13-25mm, width 2-3mm, is highly 0.2-0.3mm；Institute
It states battery case bottom and is located at the Laser Welding contact that the position in protection protrusion outside is 0.1-1mm equipped with a loop diameter,
The position that the battery case bottom is located at protection protrusion inside is provided with the laser welding that a loop diameter is 0.1-0.5mm
Point；
Wherein, the positive terminal generally " dumbbell shape " structure, the one end connecting with battery core side of the positive electrode are round sheet body, directly
Diameter is 12-26mm, and it is 2-6mm circular hollow slot that centre, which is equipped with a diameter,；
The other end that the positive terminal is connect with positive nut cap is that width 8-22mm, the polygon of length 5-10mm or fillet are long
It is rectangular or oval；The both ends of the positive terminal are connected with elongated sheet body, and the length of the elongated sheet body of positive terminal is
10-15mm；Positive terminal with a thickness of 0.1-0.3mm；
The rounded sheet body of negative terminal, outer diameter 15-29mm, being equipped with width in negative terminal surface is connecing for 3.5-5mm
Touching protrusion, the two sides of contact projection are platform part；The height of the negative terminal is 0.2-0.6mm, middle part is equipped with a diameter
For the hollow circle of 2-5mm；The negative terminal platform part with a thickness of 0.1-0.3mm；
The battery core is single battery core, and is the exposed battery core of both ends collector；
The battery core negative side is electrically connected with battery case bottom by the negative terminal, and wherein: the negative terminal with
Contact projection is electrically connected with the battery core negative side, is electrically connected with its platform part with the battery case bottom；
The battery core side of the positive electrode is electrically connected with the positive nut cap by the positive terminal, and the anode insulating trip is set to described
Insulation system is formed between positive terminal and the battery case.
2. circle high power lithium ion cell structure according to claim 1, it is characterised in that: the battery core positive and negative anodes table
Face parallel deviation is less than or equal to 0.2mm.
3. circle high power lithium ion cell structure according to claim 1, it is characterised in that: the anode insulating trip is
The hollow type gasket of thickness 0.05-0.2mm, and vertically there is the extension side of 2-4mm in edge.
4. circle high power lithium ion cell structure according to claim 1, it is characterised in that: form the electrical connection
Position is all made of laser welding connection.
5. any circle high power lithium ion cell structure described in -4 according to claim 1, it is characterised in that: the anode
Terminal is made of high-purity aluminium flake, and negative terminal is made of high-purity nickel sheet.
6. any circle high power lithium ion cell structure described in -4 according to claim 1, it is characterised in that: the anode
Insulating trip uses polytetrafluoroethylene (PTFE) material.
7. any circle high power lithium ion cell structure described in -4 according to claim 1, it is characterised in that: the battery
Shell, positive terminal, the hollow part of negative terminal are symmetrical in center line along the respective center of circle.
8. a kind of circle high power lithium ion cell preparation method, which is characterized in that itself comprising steps of
The seamless non-porous cylindrical cell external case in bottom is made in S1, selection steel, punching press, while in the bottom punching press of battery case
The protection protrusion is formed, such as the described in any item battery cases of claim 1-7 are made；
S2, it is stamped and formed out such as the described in any item positive terminals of claim 1-7 and negative terminal；
S3, negative terminal is placed and secured in battery core negative side, is recessed by the back side of contact projection and determines that Laser Welding integrates with
Mark carries out laser welding along the edge of the recess of the contact projection back side using laser, positive terminal is then placed on electricity
Core side of the positive electrode, the one end for being connect the positive terminal with battery core using laser and the battery core side of the positive electrode are using laser welding；
S4, the above-mentioned battery core connected is put into battery case, after fixing battery core and battery case, really by protection protrusion
Determine laser welding track, the laser welding point using laser along the interior outside of the protection protrusion carries out laser welding, makes battery
Shell is electrically connected with negative terminal realization；
S5, the other end of the positive terminal and positive nut cap progress laser welding are fixed.
9. a kind of round high power lithium ion cell preparation method according to claim 8, which is characterized in that the Laser Welding
Connecing is that laser welding is carried out using surface-to-surface, i.e., is spot welded using intensive laser welding, with formation " connection of face domain ".
10. a kind of round high power lithium ion cell preparation method according to claim 8, which is characterized in that the cathode
The position that terminal and battery case bottom are correspondingly connected with, which is equipped with, prevents from generating the boss that slag splashes in laser beam welding, with into
The reliability and accuracy of one step guarantee connection relationship.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112670558A (en) * | 2020-12-25 | 2021-04-16 | 中山市众旺德新能源科技有限公司 | Miniature lithium ion battery and preparation method thereof |
| CN114639863A (en) * | 2022-03-28 | 2022-06-17 | 远景动力技术(江苏)有限公司 | Cylindrical battery and method for manufacturing the same |
| CN115295948A (en) * | 2022-09-09 | 2022-11-04 | 北京胜能能源科技有限公司 | Dumbbell battery, battery module and vehicle |
| WO2022242744A1 (en) * | 2021-05-21 | 2022-11-24 | 湖北亿纬动力有限公司 | Battery |
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| CN205248358U (en) * | 2015-11-11 | 2016-05-18 | 浙江兴海能源科技有限公司 | Structure is drawn forth to lithium ion battery cathode terminal |
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| CN112670558A (en) * | 2020-12-25 | 2021-04-16 | 中山市众旺德新能源科技有限公司 | Miniature lithium ion battery and preparation method thereof |
| CN112670558B (en) * | 2020-12-25 | 2022-11-04 | 中山市众旺德新能源科技有限公司 | Miniature lithium ion battery and preparation method thereof |
| WO2022242744A1 (en) * | 2021-05-21 | 2022-11-24 | 湖北亿纬动力有限公司 | Battery |
| CN114639863A (en) * | 2022-03-28 | 2022-06-17 | 远景动力技术(江苏)有限公司 | Cylindrical battery and method for manufacturing the same |
| CN114639863B (en) * | 2022-03-28 | 2023-07-28 | 远景动力技术(江苏)有限公司 | Cylindrical battery and method for manufacturing the same |
| CN115295948A (en) * | 2022-09-09 | 2022-11-04 | 北京胜能能源科技有限公司 | Dumbbell battery, battery module and vehicle |
| CN115295948B (en) * | 2022-09-09 | 2024-03-29 | 北京胜能能源科技有限公司 | Dumbbell battery, battery module and vehicle |
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Application publication date: 20190618 |