CN110534688A - A kind of soft-package battery mould group and pole ear welding method - Google Patents
A kind of soft-package battery mould group and pole ear welding method Download PDFInfo
- Publication number
- CN110534688A CN110534688A CN201910812427.4A CN201910812427A CN110534688A CN 110534688 A CN110534688 A CN 110534688A CN 201910812427 A CN201910812427 A CN 201910812427A CN 110534688 A CN110534688 A CN 110534688A
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- Prior art keywords
- tab
- soft
- welding
- furcation
- mould group
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a kind of soft-package battery mould groups, including several battery core units and pinboard, the connection of the fixing end of battery core unit and tab, the free end of tab and the welding plate of pinboard connect, two tabs of adjacent battery core unit are connect with one piece of welding plate, and/or the free end of tab is composed of at least two furcations, there is the first interval notch between furcation, or interconnecting piece is provided between furcation, interconnecting piece and furcation are enclosed spacer holes and/or the second interval notch, two furcations of tab are connect with welding plate.In the soft-package battery mould group resistance welding procedures, two capillaries and each tab of the adjacent battery core in same welding plate are mutually pressed, and/or mutually press with tab furcation；Previous concomitant regimen is shunted without tab, the current reduction that latter scheme then shunts tab surface, it is ensured that on the basis of welding quality, is improved welding efficiency, is reduced the viscous needle probability of capillary and tab.
Description
Technical field
The present invention relates to lithium battery production technical fields, and in particular to a kind of soft-package battery mould group and pole ear welding method.
Background technique
The composition of soft-package battery includes the concatenated battery core unit of multi-disc, pinboard, side insulating trip, bottom insulation piece, top
Insulating cover, side plate, end plate, insulating part, total positive conductive Hard link, total negative conductive Hard link and EVA material.Wherein, adjacent Soft Roll
The contact surface of battery core is coated with heat conductive silica gel and is bonded；EVA is placed between the top of adjacent battery core；Tab and switching at the top of battery core
Plate connection；Pinboard top covering top insulating cover；Two sides insulating trip is pasted onto side plate interior sides by heat conductive silica gel；Side plate and end
Plate fastens soft pack cell by laser welding；Insulating part is connected by a snap with end plate；The top of insulating part is provided with
Conducting connecting part, conducting connecting part are used to be connected with total positive conductive Hard link, total negative conductive Hard link.
There are following technological deficiencies for above-mentioned soft-package battery mould group:
The first, by electric resistance welding between tab and pinboard, since tab is conductive material, when two capillary tops
When being pressed on tab, one part of current is conducted via tab itself, and another part electric current is conducted through pad on tab and pinboard
And nugget is formed on the contact surface.Since tab is single strip in the prior art, the electric current conducted via tab itself is big, from
And the welding current of tab pinboard is reduced, causing nugget to be formed, the time is long, welding efficiency is low, or melts because tab is heated
There are the bad problems such as viscous needle.In the prior art, a kind of tab is disclosed in CN201438480U, but above-mentioned tab is solved
Exist between solder joint when technical problem is ultrasonic bonding and interfere with each other, bonding area is insufficient between tab pole piece；Due to Soft Roll
Battery pole ear thickness is thin, and by pushing, active force is easily-deformable, therefore has enough contacts area between tab and busbar connector.
Second, end plate in the prior art is by buckle insulating part and positioned at the conduct piece connection on buckle insulating part top
Total positive conductive Hard link, total negative conductive Hard link, battery insulating part solid failure in vibration processes are caused to be conductively connected and be broken
Security risk；
Third, top insulating cover is usually that particular manufacturing craft molding is made in the prior art, in order to facilitate the connection of top insulating cover,
Shackle member, the high production cost and poor universality of insulating cover are preset on the face of base.
Summary of the invention
It is an object of the present invention to overcoming defect existing in the prior art, a kind of soft-package battery mould group, base are provided
In improved tab shape or the connection structure of tab pinboard, glue that needle probability is low, welding efficiency is high using electric resistance welding.
In order to realize above-mentioned technical effect, the technical solution of the present invention is as follows: a kind of soft-package battery mould group, including several electricity
The fixing end of core unit and pinboard, battery core unit and tab connects, and the free end of the tab and the welding plate of pinboard connect,
It is characterized in that, two tabs of the adjacent battery core unit are connect with one piece of welding plate, the two poles of the earth being connect with the welding plate
There is interval between ear；And/or the free end of tab is composed of at least two furcations, has the between the furcation
Interconnecting piece is provided between one interval notch or furcation, and the interconnecting piece and furcation are enclosed spacer holes and/or the
Two interval notches, two furcations of the tab are connect with the welding plate.
Preferred technical solution is, the free end of the tab combined by two consistent and parallel furcations of shape and
At the opening of the first interval notch or the second interval notch is located in the free end end edge of the tab.
Preferred technical solution is that the connecting plate includes substrate and welding plate, if the two sides of the substrate are arranged at intervals with
Dry convex block, welding plate are fixedly installed on adjacent projections and are formed by groove, have between the welding plate and the convex block and accommodate pole
The gap that ear passes through, the tab doubling of the adjacent battery core unit and connect with welding plate and/or the tab of forked folding
It is curved and connect with welding plate.
Preferred technical solution is that the convex block of the substrate two sides shifts to install at equal intervals.
Preferred technical solution be further include the two end plates being bonded with the soft-package battery unit positioned at outer layer, one
End plate described in block connect with total positive conductive Hard link and the pinboard, another piece of end plate and total negative conduction Hard link with
And the pinboard connection；It is provided with stepped hole on the end plate, pilot pin, the pilot pin packet are provided in the stepped hole
Include sequentially connected stud section, insulating segment and conductive lever section, the conductive lever section and total positive conductive Hard link or total
Negative conduction Hard link is connected, and the stud section is connect with the screw-internal thread fit of the stepped hole.
Preferred technical solution be further include flat top insulating cover, the top insulating cover and the end plate or
Pinboard is fixedly connected.
Preferred technical solution be further include buckle, be provided on the top insulating cover and the pinboard corresponding
Button hole, the button hole with snap fit attachment.
Preferred technical solution is, the buckle include cap portion, the main nail rod being connect with the cap portion and with the main nail
At least two elastic fins of bar connection, the acute angle of the main nail rod and elastic fin is towards the cap portion.
The second object of the present invention is to provide a kind of pole ear welding method of soft-package battery mould group, which is characterized in that base
In above-mentioned soft-package battery mould group, which comprises the following steps: in resistance welding process, root bead needle press setting
On the tab of the first battery core unit, another root bead needle press is arranged on the tab of the second battery core unit, first battery core
Between unit and the tab of the second battery core unit exist interval and be bonded with pinboard and/or two capillaries be arranged with it is described
On the furcation of welding plate fitting, the capillary is mutually pressed with furcation one-to-one correspondence.
The advantages and beneficial effects of the present invention are:
Each tab of two adjacent battery cores is connect with one piece of welding plate in the soft-package battery mould group and/or tab free end is by least
Two furcations are composed；In resistance welding procedures, two capillaries and each tab of the adjacent battery core in same welding plate are mutually pushed up
Pressure, and/or mutually pressed with tab furcation；Previous concomitant regimen is shunted without tab, and notch and spacer holes are spaced in latter scheme
Presence widened the distance of capillary electric current overcurrent inside the tab, the current reduction for shunting tab surface can improve warp
The electric current passed through by tab pinboard binding face improves welding efficiency, while reducing capillary on the basis of ensuring welding quality
With the viscous needle probability of tab.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of tab, pinboard and electric resistance welding equipment in the prior art；
Fig. 2 is the schematic perspective view of 1 soft-package battery mould group of embodiment；
Fig. 3 is the partial enlarged view of A in Fig. 2；
Fig. 4 is the expanded view of tab in embodiment 1；
Fig. 5 is the welding structure schematic diagram of tab, welding plate and electric resistance welding equipment in embodiment 1；
Fig. 6 is another welding structure schematic diagram of tab in embodiment 1, welding plate and electric resistance welding equipment；
Fig. 7 is the overlooking structure diagram of 1 soft-package battery mould group of embodiment；
Fig. 8 is the partial enlarged view of B in Fig. 8；
Fig. 9 is end plate, positioning column and total positive conductive hardwired structural schematic diagram；
Figure 10 is the structural schematic diagram of 2 soft-package battery mould group of embodiment；
Figure 11 is the structural schematic diagram of buckle, top insulating cover and pinboard；
Figure 12 is the expanded view of tab in embodiment 3；
Figure 13 is the welding structure schematic diagram of tab, welding plate and electric resistance welding equipment in embodiment 4；
In figure: 1, pinboard；11, welding plate；12, substrate；13, convex block；2, battery core unit；21, tab；3, end plate；4, it is always just leading
Electric Hard link；5, total negative conductive Hard link；6, stepped hole；7, pilot pin；71, stud section；72, insulating segment；73, conductive lever
Section；8, top insulating cover；9, it buckles；91, cap portion；92, main nail rod；93, elastic fin；10, button hole；
A, furcation；B, the first interval notch；C, interconnecting piece；D, spacer holes；E, gap；F, spot-welding equipment；F1, capillary.
Specific embodiment
With reference to the accompanying drawings and examples, further description of the specific embodiments of the present invention.Following embodiment is only
For clearly illustrating technical solution of the present invention, and not intended to limit the protection scope of the present invention.
Tab
The free end of tab has at least two furcations to be composed, and has the first interval notch or bifurcated between furcation
Interconnecting piece is provided between portion, interconnecting piece and furcation are enclosed spacer holes and/or the second interval notch.It is located at tab certainly
Can be mutually indepedent by the furcation held, it can also partially connect.Preferably, bifurcation is spaced notch two sides in first.Above-mentioned pole
Theoretically quantity is unlimited for the free end furcation of ear, but the increase of furcation quantity is unfavorable for tab and the connection of pinboard is steady
It is fixed, and can also directly result in the increase of spot welding number in tab welding.
The free end edge of tab includes two sides and free end end edge, the extending direction of two sides and the fixing end of tab
Direction to free end is consistent.The opening of first interval notch and the second interval notch can be located in side or end edge, can also position
In the angle of side end edge.
Further, the free end of tab is composed of two consistent and parallel furcations of shape, and the first interval
The opening of notch or the second interval notch is located in the free end end edge of the tab, i.e., the first interval notch or the second interval lack
The opening of mouth is not located at the side of tab.The shape of furcation is consistent, contributes to form adjoining dimensions or identical nugget, into
The performance and used life of one step raising battery pack.
Each tab of the adjacent battery core unit is connect with one piece of welding plate
Tab connection in soft-package battery mould group depends on the quantity of the series-parallel and soft-package battery unit of battery unit.When
It include concatenated n soft-package battery unit in soft-package battery mould group, positioned at one of them of two soft-package battery units of outer layer
Electrode needs to connect with the welding plate for being located at pinboard end and total positive conductive Hard link, total negative conductive Hard link, remaining is adjacent
It is connect after the tab doubling of soft-package battery unit with the same welding plate on pinboard.Adjacent two soft-package battery units series connection
When, the doubling tab with the welding of same welding plate is not homopolarity, i.e., one is positive pole ear, another is negative lug；Adjacent
When two soft-package battery unit parallel connections, it is all positive pole ear, cathode pole that the doubling tab with the welding of same welding plate, which is homopolarity,
Ear.
Since two tab spacing in same welding plate are smaller, two capillaries can press against same respectively when electric resistance welding
On two tabs in welding plate, and above-mentioned tab is preferably vertical bar shape in the prior art, two tabs in above-mentioned welding structure
Interval setting, i.e., two tabs in same welding plate do not overlap, therefore tab internal shunt is not present in welding current, with use
Dichotomous tab reduces its internal shunt and compares, and two capillaries of welding equipment are mutually pushed up with two tabs in same welding plate
Pressure, the nugget synthesis speed of such welding manner is faster.
As two kinds of concomitant regimens for reducing tab internal shunt, can be applied in a soft-package battery mould group simultaneously, i.e.,
Tab connect with total positive conductive Hard link, total negative conductive two component of Hard link is forked, remaining tab is vertical bar shape, two
The tab of vertical bar shape is connect in doubling shape with one piece of welding plate, two vertical bar shape tab interval settings, correspondingly, same battery modules
Production technology in, pole ear welding method may be two kinds.
Connecting plate
Connecting plate includes substrate and welding plate, and substrate two sides form gap, the welding plate, appearance that convex block, receiving tab successively pass through
Gap that tab of receiving passes through, convex block, pad reaches and limits to lower section cell polar ear between two substrates convex block in above structure
And avoid the technical effect of short circuit.Further, the convex block of substrate two sides shifts to install.
End plate and pilot pin
With the insulating part of the buckle fixation used in the prior art, the stud of pilot pin is threadedly coupled with stepped hole, specifically, rank
Terraced hole is at least divided into two sections, and the biggish aperture section in aperture and aperture are lesser and go deep into the thread segment inside end plate, thread segment with
Stud connection, aperture section is for accommodating the insulating segment and conductive lever section of pilot pin, the beneficial effect is that is be threadedly coupled is tight
Gu mode is more reliable, battery insulating part solid failure in vibration processes is avoided to cause to be conductively connected the security risk being broken.
Further, when end plate is metal material, stud is similarly metal material.
Pinboard, top insulating cover and buckle
Flat top insulating cover can directly be cut by plate and is made, without particular manufacturing craft molding or punching press preparation, production
It is at low cost and versatile.
Compared with detent prefabricated on insulating cover in the prior art, buckle it is versatile at low cost, suitable for not having to
The soft-package battery mould group of model has similar connective stability, in contrast, buckle compared with being threadedly coupled with gluing
Cost is lower.
As shown in Figure 1,11 furcation of tab is bonded setting with switching part, the two root bead needle f1 of welding equipment f are corresponded
Press against the surface of 11 furcation of tab.Dotted line and arrow indicate current direction in figure.
Embodiment 1
As illustrated in figs. 2 through 8,1 soft-package battery mould group of embodiment includes pinboard 1 and several concatenated battery core units 2, battery core list
Member 2 is connect with the fixing end of tab 21, and the free end of tab 21 is connect with the welding plate 11 of pinboard 1, the tab 21 in embodiment 1
Free end be composed of the consistent and parallel furcation a of two shapes, between furcation a have first interval notch b,
The opening of first interval notch b is located in the free end end edge of tab 21, and 21 bending of tab of forked is simultaneously connect with welding plate 11.
Connecting plate includes substrate 12 and welding plate 11 in embodiment 1, and the two sides of substrate 12 are arranged at intervals with several convex blocks 13, weldering
Plate 11 is fixedly installed on adjacent projections 13 and is formed by groove, has between welding plate 11 and convex block 13 and accommodates what tab 21 passed through
Gap e, 21 doubling of tab of adjacent battery core unit 2 are simultaneously connect with welding plate 11.
The convex block 13 of 12 two sides of substrate shifts to install at equal intervals.
Embodiment 2
As shown in figs. 9-11, embodiment 2 is based on embodiment 1, and difference is, further includes being bonded with two outer layer battery core units 2
End plate 3, an end plate 3 are connect with total positive conductive Hard link 4 and pinboard 1, another end plate 3 and total negative conductive Hard link 5
And pinboard 1 connects；It is provided with stepped hole 6 on end plate 3, pilot pin 7 is provided in stepped hole 6, pilot pin 7 includes successively connecting
Stud section 71, insulating segment 72 and the conductive lever section 73 connect, conductive lever section 73 and total positive conductive Hard link 4 are total negative conductive hard
Connection 5 is connected, and stud section 71 is connect with the screw-internal thread fit of stepped hole 6.
Embodiment 3 further includes flat top insulating cover 8, and top insulating cover 8 is connect by buckle 9 with pinboard 1, pushed up
Corresponding button hole 10 is provided on portion's insulating cover 8 and pinboard 1, button hole 10 and buckle 9 are cooperatively connected.Buckle 9 include cap portion 91,
The main nail rod 92 being connect with cap portion and at least two elastic fins 93 being connect with main nail rod 92, main nail rod 92 and elastic fin 93
Acute angle towards cap portion 91.
Embodiment 3
As shown in figure 12, embodiment 3 is based on embodiment 1, and difference is, is provided with interconnecting piece c between furcation a, interconnecting piece c with
Furcation a is enclosed spacer holes d, and two furcation a of tab 21 are connect with welding plate 11.
Embodiment 4
As shown in figure 13, embodiment 4 is based on embodiment 1, and difference is, two tabs 21 of adjacent battery core unit 2 are interruption-like
It is connect with one piece of welding plate 11, there is interval between two tabs 21 connecting with welding plate 11, i.e., two tabs 21 do not overlap.
Based on the extreme ear structure of embodiment 1, tab width is 10mm, and the furcation a width between tab two sides is
The width of 4.5mm, the first interval notch b of U-shaped are 1mm, and the voltage of notch depth 5.5mm, welding equipment are 4V, and pressure is
6N, two capillary interval 4mm form the nugget of identical size, and the weld interval of prior art tab is 2.5s, embodiment 1 and reality
The weld interval for applying example 4 is 1.5~1.75s, and welding efficiency promotes 30% or more.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. the fixing end of a kind of soft-package battery mould group, including several battery core units and pinboard, battery core unit and tab connects,
The free end of the tab and the welding plate of pinboard connect, which is characterized in that two tabs and one of the adjacent battery core unit
Welding plate described in block connects, and there is interval between two tabs connecting with the welding plate；And/or the free end of tab is by least two
Furcation is composed, and is had between the furcation and is provided with interconnecting piece between the first interval notch or furcation, described
Interconnecting piece and furcation are enclosed spacer holes and/or the second interval notch, two furcations of the tab and the welding plate connect
It connects.
2. soft-package battery mould group according to claim 1, which is characterized in that the free end of the tab is by two shapes one
Cause and parallel furcation be composed, it is described first interval notch or second interval notch opening be located at the tab from
By in the end edge of end.
3. soft-package battery mould group according to claim 1 or 2, which is characterized in that the connecting plate includes substrate and welding plate,
The two sides of the substrate are arranged at intervals with several convex blocks, and welding plate is fixedly installed on adjacent projections and is formed by groove, the weldering
Have between plate and the convex block and accommodate the gap that tab passes through, the tab doubling of the adjacent battery core unit simultaneously connects with welding plate
It connects and/or the tab bending of forked and is connect with welding plate.
4. soft-package battery mould group according to claim 3, which is characterized in that the convex block of the substrate two sides misplaces at equal intervals
Setting.
5. soft-package battery mould group according to claim 1, which is characterized in that further include and the Soft Roll electricity positioned at outer layer
The two end plates of pool unit fitting, one piece of end plate are connect with total positive conductive Hard link and the pinboard, another piece of institute
End plate is stated to connect with total negative conductive Hard link and the pinboard；Stepped hole is provided on the end plate, in the stepped hole
It is provided with pilot pin, the pilot pin includes sequentially connected stud section, insulating segment and conductive lever section, the conductive lever section
It is connected with total positive conductive Hard link or total negative conductive Hard link, the screw-internal thread fit of the stud section and the stepped hole connects
It connects.
6. soft-package battery mould group according to claim 1, which is characterized in that further include flat top insulating cover, institute
Top insulating cover is stated to be fixedly connected with the end plate or pinboard.
7. soft-package battery mould group according to claim 6, which is characterized in that further include buckle, the top insulating cover with
Be provided with corresponding button hole on the pinboard, the button hole with snap fit attachment.
8. soft-package battery mould group according to claim 7, which is characterized in that the buckle includes cap portion and the cap portion
The acute angle of the main nail rod of connection and at least two elastic fins connecting with the main nail rod, the main nail rod and elastic fin presss from both sides
Angle is towards the cap portion.
9. a kind of pole ear welding method of soft-package battery mould group, which is characterized in that based on the electricity of Soft Roll described in claim 1 or 8
Chi Mo group, which comprises the following steps: in resistance welding process, root bead needle press is arranged in the first battery core unit
Tab on, the press of another root bead needle is arranged on the tab of the second battery core unit, the first battery core unit and the second battery core
There is interval between the tab of unit and is bonded with pinboard and/or the bifurcated being bonded with the welding plate is arranged in two capillaries
In portion, the capillary is mutually pressed with furcation one-to-one correspondence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910812427.4A CN110534688A (en) | 2019-08-30 | 2019-08-30 | A kind of soft-package battery mould group and pole ear welding method |
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| CN201910812427.4A CN110534688A (en) | 2019-08-30 | 2019-08-30 | A kind of soft-package battery mould group and pole ear welding method |
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| CN107822288A (en) * | 2017-11-25 | 2018-03-23 | 珠海市奇润电子有限公司 | Tamper mess-tin with unidirectional cutting ferrule |
| CN109904358A (en) * | 2017-12-11 | 2019-06-18 | 中聚（杭州）新能源科技有限公司 | Applied to battery modules and its connection structure of installation fitting |
| CN207818681U (en) * | 2017-12-29 | 2018-09-04 | 中聚（杭州）新能源科技有限公司 | Battery modules end plate mounting structure and battery modules mounting structure |
| CN209119185U (en) * | 2018-11-23 | 2019-07-16 | 桑顿新能源科技有限公司 | High-energy density soft-package battery mould group |
| CN208923241U (en) * | 2018-11-30 | 2019-05-31 | 北京长城华冠汽车科技股份有限公司 | Battery modules and vehicle |
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