CN204857840U - Power battery connection piece and have its power battery package and vehicle - Google Patents
Power battery connection piece and have its power battery package and vehicle Download PDFInfo
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- CN204857840U CN204857840U CN201520582651.6U CN201520582651U CN204857840U CN 204857840 U CN204857840 U CN 204857840U CN 201520582651 U CN201520582651 U CN 201520582651U CN 204857840 U CN204857840 U CN 204857840U
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- electrokinetic cell
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- brace
- power battery
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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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Abstract
The utility model discloses a power battery connection piece and have its power battery package and vehicle. The power battery connection piece includes: at least, the two -layer parallelly connected just connexon piece of parallel range upon range of setting each other, wherein, a connexon piece is used for the welding, and all the other connexon pieces are equipped with the solder joint in counter electrode's position department and dodge hole (111). The utility model provides a power battery connection piece is provided with the connexon piece of at least two -layer mutual parallel connection and parallel range upon range of setting, with the thickness that increases the power battery connection piece, thereby guarantee to improve the current -carrying capacity of battery system major loop under the prerequisite that the width is unchangeable of connection piece, and only be in the same place a connexon piece and corresponding battery cell's utmost point post welding, the welding thickness of messenger power battery connection piece is the welding thickness of individual layer connexon piece, in order to guarantee laser welding stability of quality, improve the yields simultaneously.
Description
Technical field
The utility model relates to new energy resources system technical field, particularly relates to a kind of electrokinetic cell brace and has its electrokinetic cell bag and vehicle.
Background technology
Usually electrokinetic cell brace is adopted to connect in electric automobile power battery bag during cell connection in series-parallel, electrokinetic cell brace is connected with the mode by laser welding between cell, but, need to ensure the ampacity of battery system major loop and the quality of laser welding.Wherein, the ampacity of battery system major loop is determined by the cross-sectional area (i.e. the width of the thickness X electrokinetic cell brace of electrokinetic cell brace) of electrokinetic cell brace.The quality of laser welding is determined by the thickness of electrokinetic cell brace, and the thickness of electrokinetic cell brace is too large, be then unfavorable for welding.
Electrokinetic cell brace of the prior art adopts the sheet that is flexible coupling usually, and the sheet that is flexible coupling is by the machine-shaping in a welding manner of multiple layer metal foil.When needing to improve the ampacity of battery system major loop under the constant prerequisite of the width of sheet of ensureing to be flexible coupling, need the thickness increasing the sheet that is flexible coupling, but the too high meeting of sheet thickness that is flexible coupling causes the quality of laser welding unstable, also can reduce yields simultaneously.
Therefore, wish a kind of technical scheme to overcome or at least alleviate at least one above-mentioned defect of prior art.
Utility model content
The purpose of this utility model is at least one the above-mentioned defect providing a kind of electrokinetic cell brace to overcome or at least alleviate prior art.
For achieving the above object, the utility model provides a kind of electrokinetic cell brace.Described electrokinetic cell brace comprises: at least two-layer parallel with one another and connection sub-pieces of parallel stacked setting, and wherein, one connects sub-pieces and is used for welding, and all the other connect sub-pieces and are provided with solder joint in the position of counter electrode and dodge hole.Be understandable that, the meaning of " parallel connection " refers to: between two solder joints of the connection sub-pieces of for welding, form current path in parallel, wherein, a current path directly leads to another solder joint from a solder joint for connecting in sub-pieces at described one; Remaining current path each corresponding one or flow through one remaining connect sub-pieces.
Preferably, described at least two-layer connection sub-pieces is provided with buffer structure.
Preferably, described buffer structure is arranged on the middle part of described connection sub-pieces.
Preferably, described buffer structure is arcuate structure or V-arrangement bending structure.
Preferably, described V-arrangement bending structure protrudes to the direction away from electrokinetic cell.
Preferably, the quantity of described at least two-layer connection sub-pieces is two-layer, comprise the first connection sub-pieces and be connected sub-pieces with second, wherein, described first connects sub-pieces comprises interconnective first connecting portion and the second connecting portion, and described second connects sub-pieces comprises interconnective first weld part and the second weld part.
Preferably, described first connecting portion and the second connecting portion are interconnected by the first buffer structure, and the first weld part and the second weld part are interconnected by the second buffer structure.
Preferably, described first connecting portion and the first weld part, described second connecting portion and the second weld part, be interconnected at the same side place of described electrokinetic cell brace.
Preferably, each sub-pieces that connects has identical thickness, and one-body molded.
The utility model also provides a kind of electrokinetic cell bag, and multiple cell drawn together by described electrokinetic cell handbag, and wherein at least two cells are electrically connected to each other by electrokinetic cell brace as above.
The utility model also provides a kind of vehicle, and wherein, described vehicle comprises electrokinetic cell bag as above.
Electrokinetic cell brace in the utility model is provided with at least two-layer connection parallel with one another and the connection sub-pieces of parallel stacked setting, to increase the thickness of electrokinetic cell brace, thus ensure the ampacity improving battery system major loop under the prerequisite that the width of brace is constant, and only the pole that connects sub-pieces and corresponding cell is welded together, the throat thickness of electrokinetic cell brace is made to be the thickness that individual layer connects sub-pieces, to ensure Laser Welding Quality stability, improve yields simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of the electrokinetic cell brace according to the utility model first embodiment.
Fig. 2 is the vertical view of the brace of electrokinetic cell shown in Fig. 1.
Fig. 3 is the schematic diagram of the electrokinetic cell brace according to the utility model second embodiment.
Fig. 4 is the schematic diagram of the electrokinetic cell brace according to the utility model the 3rd embodiment.
Reference numeral:
| 11 | First connecting portion | 1’ | First sub-connection sheet |
| 12 | Second connecting portion | 11’ | Solder joint dodges hole |
| 111 | Solder joint dodges hole | 2’ | Second sub-connection sheet |
| 21 | First weld part | 3’ | 3rd sub-connection sheet |
| 22 | Second weld part | 31’ | Bond pad locations |
| 221 | Bond pad locations | 41’ | First circular sliding slopes limit |
| 31 | First buffer structure | 42’ | Second circular sliding slopes limit |
| 32 | Second buffer structure | 1a | Brace |
| 41 | First circular sliding slopes limit | 11a | Solder joint dodges hole |
| 42 | Second circular sliding slopes limit | 12a | Bond pad locations |
Embodiment
The object implemented for making the utility model, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, are further described in more detail the technical scheme in the utility model embodiment.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the utility model part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the restriction to the utility model protection range can not be interpreted as.
At least two-layer parallel with one another and parallel stacked connection sub-pieces is comprised according to the electrokinetic cell brace in the utility model.One connects sub-pieces (normally bottom connection sub-pieces) for welding, and the position of all the other connection sub-pieces counter electrodes is provided with solder joint and dodges hole.Above-mentioned electrokinetic cell brace is by being provided with at least two-layer connection parallel with one another and the connection sub-pieces of parallel stacked setting, to increase the thickness of electrokinetic cell brace, thus ensure the ampacity improving battery system major loop under the prerequisite that the width of brace is constant, and the pole only bottom being connected sub-pieces and corresponding cell welds together, the throat thickness of electrokinetic cell brace is made to be the throat thickness that individual layer connects sub-pieces, to ensure Laser Welding Quality stability, improve yields simultaneously.
Electrokinetic cell brace comprises at least two-layer connection sub-pieces, and that is, the quantity of the connection sub-pieces in electrokinetic cell brace is at least two-layer.Such as, the quantity connecting sub-pieces can be two-layer, three layers or other multilayer.It is to be noted, the connection parallel with one another of two-layer connection sub-pieces and parallel stacked setting, to increase the thickness of electrokinetic cell brace, thus ensure the ampacity increasing battery system major loop under the prerequisite that the width (namely referring to the length of the vertical edge of the connection sub-pieces shown in Fig. 2) connecting sub-pieces is constant.Also it is pointed out that only bottom being connected sub-pieces is connected with the pole of cell, make the throat thickness of electrokinetic cell brace be the throat thickness that individual layer connects sub-pieces, to ensure Laser Welding Quality stability, improve yields simultaneously.
In the preferred embodiment of shown in Fig. 1, the quantity of the connection sub-pieces in electrokinetic cell brace is two-layer, is respectively the first connection sub-pieces and is connected sub-pieces with second.That is, electrokinetic cell brace adopts double-decker, when with the sheet (i.e. electrokinetic cell brace and be flexible coupling sheet when throat thickness is consistent) under same weld quality that is flexible coupling of the prior art, throat thickness due to electrokinetic cell brace is the throat thickness that individual layer connects sub-pieces, thus enable the double-deck electrokinetic cell brace of employing effectively improve the ampacity of battery system major loop, make the ampacity of electrokinetic cell brace be the twice of ampacity of sheet of being flexible coupling in prior art.Advantageously, the first connection sub-pieces is connected sub-pieces exterior contour with second is identical, effectively can reduce development cost, and make the outward appearance neat appearance of electrokinetic cell brace when making.Be understandable that, the first connection sub-pieces is connected sub-pieces and also can be set to have different exterior contours according to actual needs with second.
Particularly, second shown in Fig. 1 with Fig. 2 is connected sub-pieces and comprises interconnective first weld part 21 and the second weld part 22.First weld part 21 and the second weld part 22 are provided with bond pad locations 221, and bond pad locations 221 is for accommodating, and the pole that solder joint is used for second connects sub-pieces and cell welds together, thus ensures to connect effect and On current.It is pointed out that the quantity of bond pad locations 221 is at least two, because the second connection sub-pieces at least welds with the pole of two cells the effect just playing On current.And in the present embodiment one preferred embodiment, welding manner adopts penetration welding method.
Shown in Fig. 1 first connects sub-pieces and comprises interconnective first connecting portion 11 and the second connecting portion 12, and on the first connecting portion 11 and the second connecting portion 12, be provided with solder joint dodge hole 111, solder joint dodges hole 111 for providing space for the second welding connecting the pole of sub-pieces and cell, weld to facilitate, effectively can alleviate the weight of electrokinetic cell brace simultaneously.It is pointed out that center that two solder joints dodge hole 111 respectively corresponding two bond pad locations 221 arrange, to facilitate the second connection sub-pieces to weld with the pole of cell, ensure the quality of just welding and rate of finished products simultaneously.Be understandable that, solder joint is dodged the quantity in hole 111, perforate size and offered position can be needed according to welding and the situation such as actual setting position of bond pad locations 221 is arranged, and the size that such as solder joint dodges hole 111 just needs to be greater than solder joint institute and forms the Outside Dimensions that weldering encloses.
Wherein, the first connecting portion 11 is connected with the first weld part 21, and the second connecting portion 12 is connected with the second weld part 22, thus the electrokinetic cell brace On current enabling it form and increase the ampacity of electrokinetic cell brace.
See Fig. 1, the first connecting portion 11, second connecting portion 12 is connected with the first weld part 21, second weld part 22 respectively in the same side of electrokinetic cell brace.First connecting portion 11 is connected by the first circular sliding slopes limit 41 with the first weld part 21, and the second connecting portion 12 is connected by the second circular sliding slopes limit 42 with the second weld part 22.Interrupt, to limit parallel better between first circular sliding slopes limit 41 and the second circular sliding slopes limit 42.First connection sub-pieces and second is connected between sub-pieces and is connected with the second circular sliding slopes limit 42 transition by the first circular sliding slopes limit 41, enable parallel current path conducting and increase ampacity, make the first connection sub-pieces, second connect the bearing capacity of the electrokinetic cell brace of sub-pieces and the first circular sliding slopes limit 41 and the second circular sliding slopes limit 42 composition is strong, intensity is high and without right angle to prevent scratch operating personnel simultaneously.Be understandable that, the first connecting portion 11, second connecting portion 12 also can carry out transition with the first weld part 21, second weld part 22 by the fillet with other shape respectively in the same side and be connected.
Advantageously, the distance between adjacent connection sub-pieces equals the thickness connecting sub-pieces.That is, in a preferred embodiment, first distance (i.e. the height on the first circular sliding slopes limit 41 or the second circular sliding slopes limit 42) connected between sub-pieces and the second connection sub-pieces equals the thickness that the first connection sub-pieces or second connects sub-pieces, thus make the height on the first circular sliding slopes limit 41 and the second circular sliding slopes limit 42 moderate, easily carry out bending forming.And the excessive height on the first circular sliding slopes limit 41 and the second circular sliding slopes limit 42, then take up room comparatively large, the height on the first circular sliding slopes limit 41 and the second circular sliding slopes limit 42 is too low, be then unfavorable for bending.Be understandable that, the height on the first circular sliding slopes limit 41 and the second circular sliding slopes limit 42 can be arranged according to actual needs.
Advantageously, the first connecting portion 11 and the second connecting portion 12 are interconnected by the first buffer structure 31, and the first weld part 21 and the second weld part 22 are interconnected by the second buffer structure 32.In a preferred embodiment, the first buffer structure 31 and the second buffer structure 32 are all arranged on two solder joints and dodge between hole 111.Because battery in use can expand, thus the solder joint that can connect the pole of sub-pieces and cell to second produces power, make the first buffer structure 31 and the second buffer structure 32 that deformation occurs simultaneously, and the power that the first buffer structure 31 and self a deformation of the second buffer structure 32 produce the second solder joint being connected the pole of sub-pieces and cell when can reduce cell expansion, thus effectively ensure reliability and the fail safe of battery.Meanwhile, due to issuable welding deformation during welding, the first buffer structure 31 and the second buffer structure 32 can reduce the impact that welding deformation brings, and improve the welding quality of electrokinetic cell brace.Meanwhile, the tolerance of production can be reduced again to a certain extent, be conducive to reducing costs.Be understandable that, the setting position of the first buffer structure 31 and the second buffer structure 32 can need to arrange according to reality buffering.
In the preferred embodiment of shown in Fig. 1, first buffer structure 31 and the second buffer structure 32 preferably adopt V-arrangement bending structure 4, to facilitate bending forming, and can deformation be produced under the effect of external force, power during to reduce cell expansion, the second solder joint connecting the pole of sub-pieces and cell produced.Be understandable that, the first buffer structure 31 and the second buffer structure 32 also can adopt the bending structure of other arbitrary shape, such as, and U-shaped, the shape such as square.It is pointed out that V-arrangement bending structure 4 can be made by the mode such as mechanical deflection or punching press.
In a preferred embodiment, the projected direction of V-arrangement bending structure is connect sub-pieces from second to point to the direction that first connects sub-pieces.That is, V-arrangement bending structure 4 connects sub-pieces by first to be connected sub-pieces with second and therefrom upwards to bend and formed in portion.Be understandable that, the projected direction of V-arrangement bending structure also can be connect sub-pieces from first to point to the direction that second connects sub-pieces.
Advantageously, each connection sub-pieces in electrokinetic cell brace has identical thickness, and one-body molded.That is, it is shaping that the first connection sub-pieces, the second connection sub-pieces, the first buffer structure 31, second buffer structure 32 and the first circular sliding slopes limit 41 and the second circular sliding slopes limit 42 are integrated metal plate punching, electrokinetic cell brace made simple and convenient.Particularly, the processing mode of electrokinetic cell brace is followed successively by die sinking production, aluminium sheet blanking, cuts out plate, punching press and bending and molding.
It is to be noted, the direction of two current flowings in electrokinetic cell brace as denoted by the arrows in fig. 2, particularly, electric current corresponding to hollow arrow directly flows to the solder joint on the second connecting portion 12 from the solder joint the second weld part 22, electric current corresponding to open type arrow first flows to the second circular sliding slopes limit 42, first weld part 21, first buffer structure 31, first connecting portion 11 and the first circular sliding slopes limit 41 successively from the solder joint the second weld part 22, then flows to the solder joint on the second connecting portion 12.
In the second embodiment shown in Fig. 3, electrokinetic cell comprises the first connection sub-pieces 1 ', second and connects sub-pieces 2 ' and the 3rd connection sub-pieces 3 '.Connect in sub-pieces 3 ' the 3rd and be provided with bond pad locations 31 ', bond pad locations 31 ' is for accommodating solder joint, and the pole that solder joint is used for the 3rd connects sub-pieces 3 ' and cell welds together.First connects sub-pieces 1 ' is connected with second and sub-pieces 2 ' all offers solder joint dodges hole 11 ', welds the 3rd connection sub-pieces 3 ' to facilitate with the pole of cell.This embodiment adopts three-decker, and the throat thickness of electrokinetic cell brace is the throat thickness that individual layer connects sub-pieces, thus enable the electrokinetic cell brace of employing three-decker effectively improve the ampacity of battery system major loop, make the ampacity of electrokinetic cell brace be three times of ampacity of sheet of being flexible coupling in prior art, and the direction of three current flowings as indicated by the arrows in fig. 3.
In the 3rd embodiment shown in Fig. 4, electrokinetic cell bag bends docking by a brace 1a and forms.Brace is provided with bond pad locations 12a, and bond pad locations 12a is used for accommodating solder joint, and solder joint is used for the pole of brace 1a and cell to weld together.Brace 1a also offers solder joint and dodge hole 11a, weld to facilitate.Article two, the direction of current flowing as shown by the arrows in figure 4.
The utility model also provides a kind of electrokinetic cell bag, and electrokinetic cell comprises multiple cell, and wherein, at least two cells are interconnected by electrokinetic cell brace as above.Wherein, the pole that the only bottom in electrokinetic cell brace connects sub-pieces and corresponding cell welds together.As mentioned above, in the present embodiment, only connect sub-pieces by second to weld with the pole of cell, the throat thickness of electrokinetic cell brace is made to be individual layer throat thickness, and the throat thickness of electrokinetic cell brace more thin being more conducive to welds, thus ensure the stability of welding quality, improve yields.Thus, electrokinetic cell brace in the utility model welds with the pole of cell by adopting individual layer brace, compare when having same thickness (each gross thickness connecting sub-pieces namely in electrokinetic cell brace is identical with the gross thickness of the sheet that is flexible coupling) with the sheet that is flexible coupling of the prior art, the welding quality of the electrokinetic cell brace in the utility model is better, and welding yields is higher.
The utility model also provides a kind of vehicle, and described vehicle comprises electrokinetic cell bag as above.
Electrokinetic cell brace in the utility model is provided with at least two-layer connection parallel with one another and the connection sub-pieces of parallel stacked setting, to increase the thickness of electrokinetic cell brace, thus ensure the ampacity improving battery system major loop under the prerequisite that the width of brace is constant, and the pole only bottom being connected sub-pieces and corresponding cell welds together, the throat thickness of electrokinetic cell brace is made to be the throat thickness that individual layer connects sub-pieces, to ensure Laser Welding Quality stability, improve yields simultaneously.
Finally it is to be noted: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit.Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (11)
1. an electrokinetic cell brace, it is characterized in that, comprising: at least two-layer parallel with one another and connection sub-pieces of parallel stacked setting, wherein, one connects sub-pieces and is used for welding, and all the other connection sub-pieces are provided with solder joint and dodge hole (111) in the position of counter electrode.
2. electrokinetic cell brace as claimed in claim 1, it is characterized in that, described at least two-layer connection sub-pieces is provided with buffer structure.
3. electrokinetic cell brace as claimed in claim 2, it is characterized in that, described buffer structure is arranged on the middle part of described connection sub-pieces.
4. electrokinetic cell brace as claimed in claim 2, it is characterized in that, described buffer structure is arcuate structure or V-arrangement bending structure.
5. electrokinetic cell brace as claimed in claim 4, it is characterized in that, described V-arrangement bending structure protrudes to the direction away from electrokinetic cell.
6. electrokinetic cell brace as claimed in claim 1, it is characterized in that, the quantity of described at least two-layer connection sub-pieces is two-layer, comprise the first connection sub-pieces and be connected sub-pieces with second, wherein, described first connects sub-pieces comprises interconnective first connecting portion (11) and the second connecting portion (12), and described second connects sub-pieces comprises interconnective first weld part (21) and the second weld part (22).
7. electrokinetic cell brace as claimed in claim 6, it is characterized in that, described first connecting portion (11) and the second connecting portion (12) are interconnected by the first buffer structure (31), and the first weld part (21) and the second weld part (22) are interconnected by the second buffer structure (32).
8. electrokinetic cell brace as claimed in claim 7, it is characterized in that, described first connecting portion (11) and the first weld part (21), described second connecting portion (12) and the second weld part (22), be interconnected at the same side place of described electrokinetic cell brace.
9. electrokinetic cell brace as described in claim 8, is characterized in that, each sub-pieces that connects has identical thickness, and one-body molded.
10. an electrokinetic cell bag, is characterized in that, comprises multiple cell, and wherein at least two cells are electrically connected to each other by the electrokinetic cell brace such as according to any one of claim 1-8.
11. 1 kinds of vehicles, is characterized in that, comprise electrokinetic cell bag as claimed in claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520582651.6U CN204857840U (en) | 2015-08-05 | 2015-08-05 | Power battery connection piece and have its power battery package and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520582651.6U CN204857840U (en) | 2015-08-05 | 2015-08-05 | Power battery connection piece and have its power battery package and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN204857840U true CN204857840U (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520582651.6U Active CN204857840U (en) | 2015-08-05 | 2015-08-05 | Power battery connection piece and have its power battery package and vehicle |
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| CN (1) | CN204857840U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531948A (en) * | 2016-10-19 | 2017-03-22 | 广东亿纬赛恩斯新能源系统有限公司 | A battery pack connecting plate welding structure and welding process |
| WO2021088667A1 (en) * | 2019-11-04 | 2021-05-14 | 宁德时代新能源科技股份有限公司 | Electrical connection piece, battery module, battery set and apparatus |
-
2015
- 2015-08-05 CN CN201520582651.6U patent/CN204857840U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531948A (en) * | 2016-10-19 | 2017-03-22 | 广东亿纬赛恩斯新能源系统有限公司 | A battery pack connecting plate welding structure and welding process |
| WO2021088667A1 (en) * | 2019-11-04 | 2021-05-14 | 宁德时代新能源科技股份有限公司 | Electrical connection piece, battery module, battery set and apparatus |
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