CN210120158U - Battery cover plate structure and lithium ion battery based on nanometer is moulded plastics - Google Patents
Battery cover plate structure and lithium ion battery based on nanometer is moulded plastics Download PDFInfo
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- CN210120158U CN210120158U CN201921122996.8U CN201921122996U CN210120158U CN 210120158 U CN210120158 U CN 210120158U CN 201921122996 U CN201921122996 U CN 201921122996U CN 210120158 U CN210120158 U CN 210120158U
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- cover plate
- injection molding
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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 battery cover plate structure and a lithium ion battery based on nano injection molding, wherein the battery cover plate structure comprises a cover plate and a connecting sheet, and a plurality of nano holes are formed on the surface of the connecting sheet and the surface of the cover plate facing the connecting sheet; the cover plate and the connecting sheet are fixedly connected through an injection molding piece, and the injection molding piece permeates into the nano holes. The utility model discloses an in the plastic that moulds plastics can permeate the nanopore, promote the cohesion between connection piece and the apron, the gas tightness of guarantee connection piece and apron junction is good. 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. Further, in the conventional technology, if the connecting sheet needs to be subjected to friction welding processing for the composite structure, the bonding force of the composite structure can be improved through injection molding plastic, friction welding is not needed, and the cost is saved and the fracture risk of the connecting sheet can be avoided.
Description
Technical Field
The utility model relates to a battery field especially relates to a battery cover plate structure and lithium ion battery based on nanometer is moulded plastics.
Background
In the battery cover plate structure of the power battery in the new energy automobile industry at present, the connecting sheet and the cover plate are generally assembled. The friction welding processing is mainly used when the connecting piece is of a composite structure, for example, a copper sheet and an aluminum sheet are formed into a copper-aluminum composite connecting piece through friction welding. Then assembling a lower plastic part formed by injection molding of a sealing ring made of fluororubber and a PP (polypropylene) material on the positive/negative connecting sheet; 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 a sealing ring and lower plastic by utilizing a PPS injection molding process, and ensuring that the cover plate is combined with a plurality of parts to form the battery cover plate.
The current structure has certain risk, because whole spare part is more, each spare part manufacturing procedure is complicated, relates to the quality control of numerous processing and finished product equipment links, and the uniformity percent of pass of whole finished product is low, and friction welding can not 100% effective welding in addition, has the fracture risk, is the problem that whole friction welding trade is difficult to solve at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a battery cover plate structure and lithium ion battery based on nanometer is moulded plastics solves the problem that the battery apron qualification rate is low.
To achieve the purpose, the utility model adopts the following technical proposal:
a battery cover plate structure based on nano injection molding comprises a cover plate and a connecting plate, wherein a plurality of nano holes are formed in the surface of the connecting plate and the surface of the cover plate facing the connecting plate; the cover plate and the connecting sheet are fixedly connected through an injection molding piece, and the injection molding piece permeates into the nano holes.
As an alternative of the present invention, the pore diameter of the nano-pores is 70-120nm, and the pore depth is 2-5 μm.
As an alternative of the utility model, the injection molding is PPS injection molding or PBT injection molding.
As an alternative of the utility model, the battery cover plate structure includes two connection pieces, two the connection piece is anodal connection piece and negative pole connection piece respectively, be equipped with on the battery apron and supply anodal connection piece male anodal hole and supply negative pole connection piece male negative pole hole.
As an alternative of the utility model, the positive connection piece is anodal aluminium connection piece, the negative pole connection piece is negative pole copper aluminium composite connection piece, the battery apron is battery aluminium apron.
As an alternative of the utility model, negative pole copper aluminium composite connection piece is including interconnect's negative pole copper connection piece and negative pole aluminium connection piece, negative pole copper connection piece and negative pole aluminium connection piece pass through injection molding fixed connection.
A lithium ion battery comprising a battery cover plate structure as described above.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses set up the nanopore on connection piece and apron, the rethread plastic of moulding plastics makes connection piece and apron fixed connection, and the plastic of moulding plastics can permeate the nanopore in, promotes the cohesion between connection piece and the apron to the gas tightness of guarantee connection piece and apron junction is good, and it is less than 10 to prove through the test that the gas tightness test leakage rate of battery cover plate structure is less than-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. Further, in the conventional technology, if the connecting sheet needs to be subjected to friction welding processing for the composite structure, the bonding force of the composite structure can be improved through injection molding plastic, friction welding is not needed, and the cost is saved and the fracture risk of the connecting sheet can be avoided.
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 battery cover plate structure provided in embodiment 1 of the present invention.
Fig. 2 is another schematic view of a battery cover plate structure provided in embodiment 1 of the present invention.
Fig. 3 is another schematic view of a battery cover plate structure provided in embodiment 1 of the present invention.
Fig. 4 is another schematic view of a battery cover plate structure provided in embodiment 1 of the present invention.
Illustration of the drawings: 1. a cover plate; 2. connecting sheets; 21. a negative electrode connecting sheet; 22. a positive electrode connecting sheet; 211. A negative aluminum connecting sheet; 212. a negative copper connecting sheet; 3. an injection molded part; 4. an explosion-proof valve; 5. 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, embodiment 1 provides a battery cover plate structure based on nano injection molding.
The battery cover plate structure comprises a cover plate 1 and a connecting plate 2, wherein a plurality of nano holes are formed in the surface of the connecting plate 2 and the surface of the cover plate 1 facing the connecting plate 2; the cover plate 1 and the connecting sheet 2 are fixedly connected through an injection molding piece 3, and the injection molding piece 3 permeates into the nano holes.
After the air tightness test, the leakage rate of the air tightness test of the battery cover plate structure is less than 10-7(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 cover plate 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 normally). 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 cover plate structure for detection, and finishing the detection.
This embodiment 1 sets up the nanopore on connection piece 2 and apron 1, and the plastic of rethread moulding plastics makes connection piece 2 and apron 1 fixed connection, and the plastic of moulding plastics can promote the cohesion between connection piece 2 and the apron 1 in can permeating the nanopore to the gas tightness of guarantee connection piece 2 and the 1 junction of apron is good.
Specifically, the center of injection molding 3 is equipped with the step face, and the design of step face can satisfy the electrical property requirement (electrically conductive and insulating nature) of positive negative pole on the one hand, and on the other hand welds electric core on the battery cover plate structure after, the module is assembled into with the battery to the rear end technology needs, makes things convenient for automation equipment clamp to get and welds during the equipment.
In the embodiment, the pore diameter of the nano-pore is 70-120nm, and the pore depth is 2-5 μm. The nano holes are densely distributed on the cover plate 1 and the connecting plate 2, and the distance between every two adjacent nano holes is 60-90 nm. In this embodiment, the injection molded part 3 is an insulating injection molded part, and the insulating injection molded part is preferably a PPS (polyphenylene sulfide) injection molded part. PPS can satisfy battery apron electric conduction and insulating nature requirement. In this case, a PBT (polybutylene terephthalate) injection molding can also be used.
In this embodiment, the battery cover plate structure includes two connecting sheets 2, the two connecting sheets 2 are a positive connecting sheet 22 and a negative connecting sheet 21, and the battery cover plate 1 is provided with a positive hole for inserting the positive connecting sheet 22 and a negative hole for inserting the negative connecting sheet 21.
Specifically, the positive connecting piece 22 is a positive aluminum connecting piece 2, the negative connecting piece 21 is a negative copper aluminum composite connecting piece, and the battery cover plate 1 is a battery aluminum cover plate.
The copper-aluminum compounding manner of the negative copper-aluminum composite connecting piece is not limited, and the negative copper-aluminum composite connecting piece can be an integrated copper-aluminum composite belt directly prepared by a chemical process, or a negative copper connecting piece 212 and a negative aluminum connecting piece 211 which are fixedly connected with each other. Further, the fixing connection mode between the negative copper connecting piece 212 and the negative aluminum connecting piece 211 is not limited, and may be mutual fastening connection or laser welding, etc.
The negative copper connecting piece 212 and the negative aluminum connecting piece 211 are connected in a buckled mode in a specific structure as shown in fig. 3, a first hook is formed at one end, facing the negative aluminum connecting piece 211, of the negative copper connecting piece 212, a second hook is formed at one end, facing the negative copper connecting piece 212, of the negative aluminum connecting piece 211, the hook portion of the first hook is embedded into a groove of the second hook, and the hook portion of the second hook is embedded into a groove of the first hook. At the interconnection position of the negative copper connecting sheet 212 and the negative aluminum connecting sheet 211, a part of the negative copper connecting sheet 212 is sunk towards the negative aluminum connecting sheet 211 in a riveting mode, and a part of the negative aluminum connecting sheet 211 is sunk towards the negative copper connecting sheet 212, so that the connection stability between the negative copper connecting sheet and the negative aluminum connecting sheet is further enhanced.
For the negative copper connecting sheet 212 and the negative aluminum connecting sheet 211 which are fixedly connected with each other, the injection molding piece 3 can further enhance the bonding strength between the two, and the negative copper aluminum composite connecting sheet is prevented from being broken.
The specific structure of the laser welding of the negative copper connecting piece 212 and the negative aluminum connecting piece 211 is as shown in fig. 4, wherein a first welding part is formed at one end of the negative copper connecting piece 212 facing the negative aluminum connecting piece 211, and a second welding part is formed at one end of the negative aluminum connecting piece 211 facing the negative copper connecting piece 212. And one surface of the first welding part facing the second welding part and one surface of the second welding part facing the first welding part are welded by laser. Because copper and aluminum are made of metal materials, the reflectivity is high, and laser welding is difficult to adopt. The nano holes are formed in the surfaces of the negative copper connecting piece 212 and the negative aluminum connecting piece 211, so that the injection molding piece can be conveniently infiltrated, a frosted surface is formed, and laser welding is facilitated.
In this embodiment, the battery cover plate 1 is further provided with an explosion-proof valve 4 and a liquid injection hole 5, and the explosion-proof valve 4 and the liquid injection hole 5 are located between the positive connection piece 22 and the negative connection piece 21.
This embodiment 1 sets up the nanopore on connection piece 2 and apron 1, and the plastic of rethread moulding plastics makes connection piece 2 and apron 1 fixed connection, and the plastic of moulding plastics can infiltrate in the nanopore, promotes the cohesion between connection piece 2 and the apron 1 to the gas tightness of guarantee connection piece 2 and apron 1 junction is good, and it is less than 10 to prove through the test that the gas tightness test leakage rate of battery cover plate structure is less than-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. Further, in the conventional technology, if the connecting sheet 2 needs to be processed by friction welding for a composite structure, the bonding force of the composite structure such as the copper sheet and the aluminum sheet can be improved by injection molding plastic, friction welding is not needed, and the cost is saved and the fracture risk of the connecting sheet 2 can be avoided. Furthermore, the injection molding plastic is an insulating material, so that the risk of electric conduction is avoided.
Example 2
This embodiment 2 provides a method for manufacturing a battery cover plate structure based on nano injection molding, which can manufacture the battery cover plate structure in embodiment 1.
The preparation method comprises the following steps:
s1, forming a plurality of nano holes on the surface of the connecting sheet 2 and the surface of the cover plate 1 facing the connecting sheet 2;
s2, inserting the connecting sheet 2 with the surface provided with the nano holes into the battery cover plate 1;
s3, injecting plastic at the joint of the connecting sheet 2 and the battery cover plate 1 to form an injection molding piece 3, so that the connecting sheet 2 and the battery cover plate 1 are fixedly connected.
The size and distribution density of the nano-pores, the material of the injection molding plastic, and the like are described in detail in embodiment 1, and are not described herein again.
The opening of the nanopores in step S1 is performed by chemical etching, which specifically includes the steps of:
s11, cleaning the surface of the connecting sheet 2/cover plate 1 by using a cleaning solution;
s12, placing the connecting sheet 2/cover plate 1 into alkali liquor for treatment, and then placing the connecting sheet into acid liquor containing sulfuric acid for treatment;
s13, taking a graphite plate as a cathode and the connecting piece 2/cover plate 1 as an anode, putting the graphite plate and the connecting piece 2/cover plate 1 into electrolyte containing sulfuric acid and phosphoric acid, and performing direct current electrolysis to form an oxide film on the surface of the connecting piece 2/cover plate 1; the oxide film contains nano-pores, and the pore diameter of the nano-pores is 70-120 nm;
s14, the connecting sheet 2/cover plate 1 with the oxide film is soaked in the nano coating solution, and then protection treatment is carried out in 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.
The process of injection molding the plastic in the step S3 has no special requirements, and the injection molding process parameters are as follows:
1. temperature of the die: 130 ℃ and 150 DEG C
2. Barrel temperature: a first stage: 290 ℃ and 300 ℃; and a second stage: 300 ℃ and 320 ℃; a third stage: 310 ℃ and 330 ℃; a fourth stage: 310 ℃ and 330 ℃.
3. Nozzle temperature: 310 ℃ and 330 ℃.
3. Injection molding pressure: 80-150MPa (60-95%).
4. Injection molding speed: medium speed-high speed (40-150 mm/sec).
5. Injection molding time: for 20 seconds.
Example 3
This embodiment 3 provides a lithium ion battery, which includes the battery cover plate structure described in embodiment 1 and the battery cover plate structure manufactured by the manufacturing method described in embodiment 2.
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 (8)
1. A battery cover plate structure based on nano injection molding is characterized by comprising a cover plate and a connecting plate, wherein a plurality of nano holes are formed in the surface of the connecting plate and the surface of the cover plate facing the connecting plate; the cover plate and the connecting sheet are fixedly connected through an injection molding piece, and the injection molding piece permeates into the nano holes.
2. The battery cover plate structure based on nano injection molding according to claim 1, wherein the nano holes have a pore diameter of 70-120nm and a pore depth of 2-5 μm.
3. The nano injection molding based battery cover plate structure of claim 1, wherein the injection molding is a PPS injection molding or a PBT injection molding.
4. The battery cover plate structure based on nanometer injection molding according to claim 1, wherein the battery cover plate structure comprises two connecting pieces, the two connecting pieces are a positive connecting piece and a negative connecting piece respectively, and the battery cover plate is provided with a positive hole for inserting the positive connecting piece and a negative hole for inserting the negative connecting piece.
5. The battery cover plate structure based on nanometer injection molding according to claim 4, wherein the positive connecting piece is a positive aluminum connecting piece, the negative connecting piece is a negative copper aluminum composite connecting piece, and the battery cover plate is a battery aluminum cover plate.
6. The battery cover plate structure based on nanometer injection molding according to claim 5, wherein the negative copper-aluminum composite connecting sheet comprises a negative copper connecting sheet and a negative aluminum connecting sheet which are connected with each other, and the negative copper connecting sheet and the negative aluminum connecting sheet are fixedly connected through the injection molding piece.
7. The battery cover plate structure based on nanometer injection molding according to claim 6, wherein the battery 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 positioned between the positive connecting sheet and the negative connecting sheet.
8. A lithium ion battery comprising a battery cover plate structure according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921122996.8U CN210120158U (en) | 2019-07-17 | 2019-07-17 | Battery cover plate structure and lithium ion battery based on nanometer is moulded plastics |
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| CN201921122996.8U CN210120158U (en) | 2019-07-17 | 2019-07-17 | Battery cover plate structure and lithium ion battery based on nanometer is moulded plastics |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246992A (en) * | 2019-07-17 | 2019-09-17 | 池州市骏智机电科技有限公司 | A kind of battery cover plate structure and preparation method thereof based on nanometer injection molding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246992A (en) * | 2019-07-17 | 2019-09-17 | 池州市骏智机电科技有限公司 | A kind of battery cover plate structure and preparation method thereof based on nanometer injection molding |
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