CN210120187U - Laser welding structure of battery top cap pole - Google Patents
Laser welding structure of battery top cap pole Download PDFInfo
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- CN210120187U CN210120187U CN201921121772.5U CN201921121772U CN210120187U CN 210120187 U CN210120187 U CN 210120187U CN 201921121772 U CN201921121772 U CN 201921121772U CN 210120187 U CN210120187 U CN 210120187U
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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 laser welding structure of a battery top cover pole, which is characterized by comprising a first pole, wherein the first pole comprises a fixedly connected pole A section and a pole B section; the end of the pole A section facing the pole B section is provided with an A welding part, and the end of the pole B section facing the pole A section is provided with a B welding part; one surface of the welding part A facing the welding part B is welded by laser on one surface of the welding part B facing the welding part A; a plurality of nano holes are formed in the surface, facing the welding part B, of the welding part A and the surface, facing the welding part A, of the welding part B, and frosted surfaces are formed. The utility model discloses set up the nanopore and form the frosting on the contact surface of A weld part and B weld part, avoided the reflection of light phenomenon that smooth surface leads to, the welding position is accurate. Compared with the mode of cutting the inclined plane for laser welding in the prior art, the method adopts plane welding, the area of the welding plane is not limited and can be set according to requirements, and the welding firmness is enhanced.
Description
Technical Field
The utility model relates to a battery field especially relates to a laser welding structure of battery top cap utmost point post.
Background
In the battery top cap structure of power battery in new energy automobile industry at present, the negative pole post generally adopts copper-aluminum composite post, and the existing copper-aluminum composite post mainly has two kinds of manufacturing processes: the first method is to directly utilize a chemical process to synthesize a copper-aluminum composite material, although the copper section and the aluminum section of the pole prepared by the chemical synthesis method are tightly connected, the synthesis process is complex, the cost is high and the yield is low; in the second, friction welding processing is utilized, and copper sheets and aluminum sheets are welded through friction to form copper-aluminum composite poles, but the friction welding cannot achieve 100% effective welding, so that the fracture risk exists, and the problem that the whole friction welding industry is difficult to solve at present is solved.
The laser welding has high efficiency and low fracture risk, and is an effective method for replacing friction welding. However, copper and aluminum belong to metal materials, and the reflectivity is high, so that laser welding is difficult to apply to the materials. Patent 201710090082.7 discloses a method for preventing reflection of light by slope treatment at the butt joint of copper and aluminum, but the copper and aluminum welding surface of the method is smaller, has an upper limit, and is difficult to further enlarge the copper and aluminum welding surface according to the requirement, so that the requirement of high copper and aluminum welding firmness cannot be met.
In addition, after the copper-aluminum composite pole is obtained, the pole and the cover plate generally adopt an assembly process. Assembling a sealing ring made of fluororubber and a lower plastic part made of PP plastic on the positive/negative pole column; the aluminum cover plate which is subjected to punch forming is assembled on the sealing ring and the lower plastic part, and the aluminum cover plate extrudes the sealing ring, so that the sealing ring generates a certain compression ratio to avoid air leakage; and finally, fixing the cover plate and various parts such as the sealing ring and lower plastic by utilizing a PPS plastic process, and ensuring that the cover plate and a plurality of parts are combined together to form the battery top cover. However, such an assembly structure has a certain risk, and because the number of integral parts is large, the machining and manufacturing procedures of each part are complex, the quality control of numerous machining and finished product assembly links is involved, and the consistency and the qualification rate of the integral finished product are low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a laser welding structure of battery top cap utmost point post solves the problem of copper aluminium welding difficulty.
To achieve the purpose, the utility model adopts the following technical proposal:
a laser welding structure of a battery top cover pole comprises a first pole, wherein the first pole comprises a pole A section and a pole B section which are fixedly connected; the end of the pole A section facing the pole B section is provided with an A welding part, and the end of the pole B section facing the pole A section is provided with a B welding part;
one surface of the welding part A facing the welding part B is subjected to laser welding; and one surface of the welding part A facing the welding part B and one surface of the welding part B facing the welding part A are both provided with a plurality of nano holes to form a frosted surface.
Optionally, the welding part a and the pole a section are connected through an inclined part a, and the surface of the welding part a and the surface of the pole a section are not in the same plane; the welding part B is connected with the section B of the pole column through the inclined part B, and the surface of the welding part B and the surface of the section B of the pole column are not on the same plane.
Optionally, the surfaces of the pole a section and the pole B section are located on the same plane.
Optionally, the first terminal is a negative pole, the terminal a section is a negative copper terminal, and the terminal B section is a negative aluminum terminal.
Optionally, the surfaces of the pole a section, the pole B section, the welding part a and the welding part B are all provided with a plurality of nano holes, the laser welding structure of the battery top cap pole further comprises a first plastic part, and the first plastic part permeates into the nano holes;
utmost point post A section, utmost point post B section, A welding part and B welding part are all through first plastic part fixed connection, first plastic part parcel A welding part B welding part utmost point post A section towards the part of A welding part with utmost point post B end towards the part of B welding part.
Optionally, the battery pack further comprises a cover plate, wherein a first pole column hole into which a first pole column is inserted is formed in the cover plate, and a plurality of nano holes are formed in the surface of the first pole column and the surface of the cover plate; the first pole column and the cover plate are fixedly connected through a first plastic part, and the first plastic part permeates into the nano hole;
the first plastic part is arranged between the cover plate and the first pole, and the first plastic part fills the first pole hole and wraps the part, facing the first pole, of the cover plate.
Optionally, the battery case further comprises a second pole, and the cover plate is provided with a second pole hole into which the second pole is inserted; the surface of the second pole is provided with a plurality of nano holes, the second pole and the cover plate are fixedly connected through a second plastic part, and the second plastic part permeates into the nano holes;
the second plastic part is arranged between the cover plate and the second pole column, and the second plastic part fills the second pole column hole and wraps the part, facing the second pole column, of the cover plate; the second pole is a positive pole.
Optionally, an explosion-proof valve and a liquid injection hole are arranged on the cover plate, and the explosion-proof valve and the liquid injection hole are located between the first pole column and the second pole column.
Optionally, a first plastic part convex part is formed by protruding the center of the top surface of the first plastic part, and a step surface is formed by the first plastic part convex part and the top surface of the first plastic part; the center of the top surface of the second plastic part protrudes to form a second plastic part convex part, and the second plastic part convex part and the top surface of the second plastic part form a step surface.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a laser welding structure of battery top cap utmost point post sets up the nanopore and forms the frosting on the contact surface of A weld part and B weld part, has avoided the reflection of light phenomenon that smooth surface leads to, and the welding position is accurate. Compared with the mode of cutting the inclined plane for laser welding in the prior art, the method adopts plane welding, the area of the welding plane is not limited and can be set according to requirements, and the welding firmness is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose.
Fig. 1 is a schematic view of a laser welding structure of a battery top cap terminal provided by an embodiment of the present invention.
Fig. 2 is another schematic view of a laser welding structure of a battery top cap terminal provided by an embodiment of the present invention.
Illustration of the drawings: 1. a cover plate; 2. a first pole column; 3. a second pole; 21. a pole A section; 22. a pole B section; 23. a, welding a part; 24. b, welding part; 25. a inclined part; 26. b, an inclined part; 41. A first plastic part; 42. a second plastic part; 5. an explosion-proof valve; 6. and a liquid injection hole.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 2, embodiment 1 provides a laser welding structure for a battery top cap terminal, including a first terminal 2, where the first terminal 2 includes a terminal a section 21 and a terminal B section 22 that are fixedly connected; an A welding part 23 is arranged at one end of the pole A section 21 facing the pole B section 22, and a B welding part 24 is arranged at one end of the pole B section 22 facing the pole A section 21;
a surface of the a-weld portion 23 facing the B-weld portion 24 is formed by laser welding a surface of the B-weld portion 24 facing the a-weld portion 23; the surface of the welding part A23 facing the welding part B24 and the surface of the welding part B24 facing the welding part A23 are both provided with a plurality of nano holes to form frosted surfaces.
Specifically, the first pole 2 is a negative pole, the pole a section 21 is a negative copper pole section, and the pole B section 22 is a negative aluminum pole section.
Copper and aluminum belong to metal materials, and have high reflectivity, so that laser welding is difficult to be applied to the materials. In this embodiment, form the frosting through set up the nanopore on the welding part, avoided the reflection of light phenomenon that smooth surface leads to, the welding position is accurate. Compared with the mode of cutting the inclined plane for laser welding in the prior art, the method adopts plane welding, the area of the welding plane is not limited and can be set according to requirements, and the welding firmness is enhanced.
In the present embodiment, the a-welding part 23 and the pole a-section 21 are connected by an a-inclined part 25, and the surface of the a-welding part 23 and the surface of the pole a-section 21 are not in the same plane; the B welding part 24 is connected with the pole B section 22 through a B inclined part 26, and the surface of the B welding part 24 and the surface of the pole B section 22 are not in the same plane. The surfaces of the pole A section 21 and the pole B section 22 are in the same plane.
Through the arrangement of the a inclined part 25 and the B inclined part 26, the a welding part 23 and the B welding part 24 can be in surface-to-surface contact, the plane welding is completed, and the surfaces of the pole A section 21 and the pole B section 22 can be in the same plane.
In this embodiment, the surfaces of the pole a section 21, the pole B section 22, the a welding part 23 and the B welding part 24 are all provided with a plurality of nano holes, the laser welding structure of the battery top cap pole further comprises a first plastic part 41, and the first plastic part 41 permeates into the nano holes.
Utmost point post A section 21, utmost point post B section 22, A welding part 23 and B welding part 24 all are through 41 fixed connection of first plastic part, 41 parcels of first plastic part A welding part 23B welding part 24 utmost point post A section 21 towards the part of A welding part 23 with utmost point post B end towards the part of B welding part 24.
The setting up of nanopore not only can form the frosting and avoid reflecting light, also can make the infiltration of plastic part, and then makes the surface bonding of plastic part and utmost point post inseparabler. The connection between the pole A section 21 and the pole B section 22, the A welding part 23 and the B welding part 24 is more stable through the plastic parts.
Copper and aluminum belong to metal materials, and have high reflectivity, so that laser welding is difficult to be applied to the materials. This embodiment 1 provides a laser welding structure of battery top cap utmost point post, sets up the nanopore formation frosting on the contact surface of A welding portion 23 and B welding portion 24, has avoided the reflection of light phenomenon that smooth surface leads to, and the welding position is accurate. Compared with the mode of cutting the inclined plane for laser welding in the prior art, the method adopts plane welding, the area of the welding plane is not limited and can be set according to requirements, and the welding firmness is enhanced. Further, the present embodiment ensures that the surfaces of the pole a section 21 and the pole B section 22 are in the same plane by providing the inclined portion. Furthermore, this embodiment still promotes utmost point post A section 21 and utmost point post B section 22's connection steadiness through the plastic part, and the setting of nanopore not only can form the frosting and avoid reflecting light, also can make the plastic part infiltration, and then makes the surface bonding of plastic part and utmost point post inseparabler.
Example 2
Example 2 was carried out on the basis of example 1.
Referring to fig. 2, the laser welding structure for a battery top cap post provided in this embodiment 2 further includes a cover plate 1, the cover plate 1 is provided with a first post hole for inserting the first post 2, and the surface of the first post 2 and the surface of the cover plate 1 are both provided with a plurality of nano holes. The first pole column 2 and the cover plate 1 are fixedly connected through a first plastic part 41, and the first plastic part 41 permeates into the nano holes. The first plastic part 41 is disposed between the cover plate 1 and the first pole post 2, and the first plastic part 41 fills the first pole post hole and wraps the portion of the cover plate 1 facing the first pole post 2.
In this embodiment, the laser welding structure of the battery top cap terminal further includes a second terminal 3, and the cover plate 1 is provided with a second terminal hole into which the second terminal 3 is inserted; the surface of the second pole column 3 is provided with a plurality of nano holes, the second pole column 3 and the cover plate 1 are fixedly connected through a second plastic part 42, and the second plastic part 42 permeates into the nano holes. The second plastic member is arranged between the cover plate 1 and the second pole column 3, and the second plastic member 42 fills the second pole column hole and wraps the part of the cover plate 1 facing the second pole column 3; the second pole 3 is a positive pole.
This embodiment sets up the nanopore through the surface at apron 1 and utmost point post, strengthens the firm in connection nature between apron 1 and the utmost point post, makes the gas tightness of battery top cap good.
Specifically, the cover plate 1 is provided with an explosion-proof valve 5 and a liquid injection hole 6, and the explosion-proof valve 5 and the liquid injection hole 6 are located between the first pole column 2 and the second pole column.
Further, the center of the top surface of the first plastic part 41 protrudes to form a first plastic part protrusion, and the first plastic part protrusion and the top surface of the first plastic part 41 form a step surface; the center of the top surface of the second plastic part 42 protrudes to form a second plastic part protrusion, and the second plastic part protrusion and the top surface of the second plastic part 42 form a step surface. The design of the step surface can meet the electrical performance requirements (electrical conductivity and insulativity) of the positive electrode and the negative electrode on one hand, and on the other hand, after the battery core is welded on the battery top cover structure, the battery needs to be assembled into a module by a rear-end process, so that automatic equipment can be conveniently clamped and welded during assembly.
After the air tightness test, it is found that the leakage rate of the laser welding structure of the battery top cap pole provided in this embodiment 2 is less than 10 in the air tightness test-7(Pa·m3) And s. The equipment that gas tightness test used examines the appearance for the helium that Anhui appearance science and technology resources ltd provided, and specific process and parameter are as follows:
the cell top cap structure was placed in a sealed fixture and the internal vacuum was drawn by a vacuum pump (set time 15s to 30pa end, within 6s normal). And then spraying helium to pressurize for 6s, performing helium detection for 12s, starting the helium detection when the helium pressure reaches a set value, opening the mold for 3s, and cleaning helium OK3s and NG5 s. And taking out the battery top cover structure for detection, and finishing the detection.
The laser welding structure of battery top cap utmost point post that embodiment 2 provided, the nanopore passes through chemical corrosion to set up on it, and chemical corrosion specifically includes the following step:
s11, cleaning the surface of the part to be provided with the nano holes by using a cleaning solution;
s12, placing the part to be provided with the nano-pores into alkali liquor for treatment, and then placing the part into acid liquor containing sulfuric acid for treatment;
s13, taking the graphite plate as a cathode and the part to be provided with the nano holes as an anode, putting the part to be provided with the nano holes into an electrolyte containing sulfuric acid and phosphoric acid, and carrying out direct current electrolysis to form an oxide film on the surface of the part to be provided with the nano holes; the oxide film contains nano-pores, and the pore diameter of the nano-pores is 70-120 nm;
s14, the part to be provided with the nanometer holes and provided with the oxide film is soaked in the nanometer coating solution, and then protection treatment is carried out on the polyalkenyl phosphate.
Specifically, the alkali liquor is a 50g/L sodium hydroxide solution, the acid liquor is a 70g/L sulfuric acid solution, and the nano solution comprises the following components in percentage by mass: 6% of water-based polyurethane, 1% of polyvinyl alcohol, 13% of diethyl phosphate and 80% of water.
This embodiment 1 sets up the nanopore on first utmost point post 2, second utmost point post 3 and apron 1, and the plastic of moulding plastics again makes utmost point post and 1 fixed connection of apron, and during the plastic part can permeate the nanopore, promote the cohesion between utmost point post and the apron 1 to the gas tightness of guarantee utmost point post and 1 junction of apron is good, proves through the test that the gas tightness test leakage rate of battery top cap structure is less than 10-7(Pa·m3) And/s, meeting the air tightness requirement of the battery. Compared with the prior art, the plastic part and the sealing ring are reduced, the qualification rate of finished products can be improved, and the cost is reduced.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The laser welding structure of the battery top cover pole is characterized by comprising a first pole, wherein the first pole comprises a pole A section and a pole B section which are fixedly connected; the end of the pole A section facing the pole B section is provided with an A welding part, and the end of the pole B section facing the pole A section is provided with a B welding part;
one surface of the welding part A facing the welding part B is subjected to laser welding; and one surface of the welding part A facing the welding part B and one surface of the welding part B facing the welding part A are both provided with a plurality of nano holes to form a frosted surface.
2. The laser welding structure of the battery top cap pole according to claim 1, wherein the A welding part is connected with the A section of the pole through an A inclined part, and the surface of the A welding part and the surface of the A section of the pole are not in the same plane; the welding part B is connected with the section B of the pole column through the inclined part B, and the surface of the welding part B and the surface of the section B of the pole column are not on the same plane.
3. The laser welding structure of a battery top cap terminal according to claim 1, wherein the surfaces of the terminal a section and the terminal B section are in the same plane.
4. The laser welding structure of the battery top cap pole according to claim 1, wherein the first pole is a negative pole, the pole A section is a negative copper pole section, and the pole B section is a negative aluminum pole section.
5. The laser welding structure of the battery top cap pole according to claim 1, wherein a plurality of nanopores are formed on the surfaces of the pole A section, the pole B section, the welding part A and the welding part B, the laser welding structure of the battery top cap pole further comprises a first plastic part, and the first plastic part is infiltrated into the nanopores;
utmost point post A section, utmost point post B section, A welding part and B welding part are all through first plastic part fixed connection, first plastic part parcel A welding part B welding part utmost point post A section towards the part of A welding part with utmost point post B end towards the part of B welding part.
6. The laser welding structure of the battery top cap pole according to claim 5, further comprising a cover plate, wherein the cover plate is provided with a first pole hole for inserting a first pole, and the surface of the first pole and the surface of the cover plate are both provided with a plurality of nano holes; the first pole column and the cover plate are fixedly connected through a first plastic part, and the first plastic part permeates into the nano hole;
the first plastic part is arranged between the cover plate and the first pole, and the first plastic part fills the first pole hole and wraps the part, facing the first pole, of the cover plate.
7. The laser welding structure of the battery top cap pole according to claim 6, further comprising a second pole, wherein the cover plate is provided with a second pole hole for the second pole to be inserted into; the surface of the second pole is provided with a plurality of nano holes, the second pole and the cover plate are fixedly connected through a second plastic part, and the second plastic part permeates into the nano holes;
the second plastic part is arranged between the cover plate and the second pole column, and the second plastic part fills the second pole column hole and wraps the part, facing the second pole column, of the cover plate; the second pole is a positive pole.
8. The laser welding structure of the battery top cap pole according to claim 7, wherein the cover plate is provided with an explosion-proof valve and a liquid injection hole, and the explosion-proof valve and the liquid injection hole are located between the first pole and the second pole.
9. The laser welding structure of a battery top cap post according to claim 7, wherein a first plastic part convex part is formed by protruding the center of the top surface of the first plastic part, and a step surface is formed by the first plastic part convex part and the top surface of the first plastic part; the center of the top surface of the second plastic part protrudes to form a second plastic part convex part, and the second plastic part convex part and the top surface of the second plastic part form a step surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921121772.5U CN210120187U (en) | 2019-07-17 | 2019-07-17 | Laser welding structure of battery top cap pole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921121772.5U CN210120187U (en) | 2019-07-17 | 2019-07-17 | Laser welding structure of battery top cap pole |
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| CN210120187U true CN210120187U (en) | 2020-02-28 |
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| CN201921121772.5U Active CN210120187U (en) | 2019-07-17 | 2019-07-17 | Laser welding structure of battery top cap pole |
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