CN216850131U - Battery core and power battery - Google Patents
Battery core and power battery Download PDFInfo
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- CN216850131U CN216850131U CN202121404325.8U CN202121404325U CN216850131U CN 216850131 U CN216850131 U CN 216850131U CN 202121404325 U CN202121404325 U CN 202121404325U CN 216850131 U CN216850131 U CN 216850131U
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The embodiment of the application provides an electric core and a power battery, wherein, the outer surface of the electric core shell, the outer surface of the top cover and the outer surface of the connecting part are provided with integrated solid-state insulating films so as to be used for improving the safety of the electric core and the power battery. The electric core in this application embodiment includes: the battery cell comprises a battery cell shell, an anode terminal, a cathode terminal and a top cover, wherein the anode terminal and the cathode terminal are arranged on the outer surface of the top cover, the top cover is connected with the battery cell shell through a connecting part to form a closed inner space, the inner space is used for bearing the battery cell, and the battery cell further comprises an integrated solid-state insulating film coated on the outer surface of the battery cell shell, the outer surface of the top cover and the outer surface of the connecting part.
Description
Technical Field
The application relates to the technical field of power batteries, in particular to an electric core and a power battery.
Background
With the vigorous development of new energy automobile industry, the usage amount of power batteries is larger and larger, the electrical safety becomes very important, and an insulating layer needs to be formed on the surface of a large number of power batteries. Taking a square battery monomer which is mainstream in the market at present as an example, the outer surface of the battery is coated with an insulating film which is adhered by pressure sensitive adhesive.
However, such an insulating film is liable to be scratched, the lap joint cannot be completely sealed, the film attaching efficiency is low, the adhesion reliability is poor, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an electric core and a power battery, wherein, the outer surface of the electric core shell, the outer surface of the top cover and the outer surface of the connecting part are provided with integrated solid-state insulating films so as to be used for improving the safety of the electric core and the power battery.
A first aspect of an embodiment of the present application provides an electrical core, including:
the battery cell comprises a battery cell shell, an anode terminal, a cathode terminal and a top cover, wherein the anode terminal and the cathode terminal are arranged on the outer surface of the top cover, the top cover is connected with the battery cell shell through a connecting part to form a closed inner space, the inner space is used for bearing the battery cell, and the battery cell further comprises an integrated solid-state insulating film coated on the outer surface of the battery cell shell, the outer surface of the top cover and the outer surface of the connecting part.
Preferably, the solid insulating film is formed by spraying a multi-component liquid material onto the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part by using a multi-nozzle spraying device, wherein the cell is in an activated charged state or an inactivated charged state.
Preferably, the multi-nozzle spraying device comprises a plurality of independent nozzle structures, and each component in the multi-component liquid material is sprayed through a corresponding independent nozzle structure in the multi-nozzle spraying device, so that the multi-component liquid material forms a uniform integrated solid insulating film on the outer surface of the cell shell, the outer surface of the top cover and the outer surface of the connecting part, wherein the multi-component liquid material comprises at least one component of epoxy resin, polyurethane, acrylate and silicone resin and a curing agent.
Preferably, each component in the multi-component liquid material is sprayed to the air on the outer surface of the cell casing by the multi-nozzle spraying device through a corresponding independent nozzle structure to be mixed, so that the mixed components are sprayed to the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part.
Preferably, the viscosity of each component in the multi-component liquid material is 20 to 3000mpa.s, and the density of each component in the multi-component liquid material is 0.5 to 2.5 g/ml.
Preferably, the resistance value of the solid insulating film is not less than 100M Ω/mm.
A second aspect of the embodiments of the present application provides a power battery, which includes a plurality of battery cells provided in the first aspect of the embodiments of the present application, and a carrying device for carrying the plurality of battery cells.
Preferably, the carrying device includes a heat dissipation plate disposed at a bottom side of the plurality of battery cells, and a plurality of end plates and side plates disposed at side surfaces of the plurality of battery cells.
Preferably, at least one of inner and outer surfaces of the heat radiating plate, the end plate and the side plate is coated with a solid insulating film.
According to the technical scheme, the embodiment of the application has the following advantages:
an embodiment of the present application provides an electric core, and the electric core includes: the battery cell comprises a battery cell shell, an anode terminal, a cathode terminal and a top cover, wherein the anode terminal and the cathode terminal are arranged on the outer surface of the top cover, the top cover is connected with the battery cell shell through a connecting part to form a closed inner space, the inner space is used for bearing the battery cell, and the battery cell further comprises an integrated solid-state insulating film coated on the outer surface of the battery cell shell, the outer surface of the top cover and the outer surface of the connecting part. Because the electric core in this application embodiment is provided with integral type solid state insulation film at electric core shell surface, top cap surface and connecting portion surface, because this solid state insulation film's integral type characteristic to guaranteed the good integrality and the leakproofness of solid state insulation film, and this solid state insulation film is good with the cohesiveness of electric core shell surface, top cap surface and connecting portion surface, thereby promoted solid state insulation film's wearability, also promoted the security of electric core.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a battery cell in an embodiment of the present application;
FIG. 2 is a schematic view of an embodiment of a solid insulation film coating process in an embodiment of the present application;
FIG. 3 is a schematic view of a two nozzle spray coating device according to an embodiment of the present application;
FIG. 4 is a schematic view of another embodiment of a solid insulation film coating process in the embodiment of the present application;
fig. 5 is a schematic diagram of an embodiment of a power battery in the embodiment of the present application.
Detailed Description
The embodiment of the application provides an electric core and a power battery, wherein, the outer surface of the electric core shell, the outer surface of the top cover and the outer surface of the connecting part are provided with integrated solid-state insulating films so as to be used for improving the safety of the electric core and the power battery.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, in order to improve the safety of a power battery, a layer of insulating film bonded by a pressure-sensitive adhesive is coated on the outer surface of a battery cell or the power battery, but the insulating film is easy to scratch, a lap joint port cannot realize full sealing, the film sticking efficiency is low, the bonding reliability is poor, and the like.
Based on the above problem, this application has provided an electricity core and power battery for set up integral type solid state insulation film at electricity core shell surface, top cap surface and connecting portion surface, in order to be used for promoting electric core and power battery's security.
For convenience of understanding, the following describes a battery cell in the present application, and referring to fig. 1, an embodiment of a battery cell in the embodiment of the present application includes:
the battery cell comprises a battery cell shell 101, a positive terminal 102, a negative terminal 103 and a top cover 104, wherein the positive terminal 102 and the negative terminal 103 are arranged on the outer surface of the top cover 104, the top cover 104 is connected with the battery cell shell 101 through a connecting part to form a closed inner space, the inner space is used for bearing the battery cell, and the battery cell further comprises an integrated solid insulating film coated on the outer surface of the battery cell shell, the outer surface of the top cover and the outer surface of the connecting part.
In practical applications, the connection portion between the top cover 104 and the cell casing 101 may be a welded portion formed by welding.
Different from the prior art, the outer surface of a power battery or a battery core is coated with a layer of insulating film which is bonded by pressure-sensitive adhesive, so that the insulating film is easy to scratch, the lap joint port cannot realize full sealing, and the bonding reliability is poor.
This application is at the cell shell surface, the surface of top cap surface and connecting portion is provided with integral type solid state insulation film, because solid state insulation film's integral type characteristic, make this solid state insulation film have good integrality and leakproofness, do not exist promptly because the problem of lacerating easily because the overlap joint, further because solid state insulation film and cell shell surface, the surface cohesiveness of top cap surface and connecting portion is good, thereby lead to the problem that solid state insulation film can not appear droing, the insulating nature and the security of electric core have been guaranteed.
It should be noted that the battery core in the embodiment of the present application refers to a basic component unit of a power battery, and the power battery is generally formed by connecting a plurality of battery cores through a specific circuit connection manner.
Referring to fig. 2, a solid insulation film coating process is described below based on the embodiment shown in fig. 1, and an embodiment of the solid insulation film coating process in the embodiment of the present application includes:
201. and spraying a multi-component liquid material to the outer surface of the cell shell, the outer surface of the top cover and the outer surface of the connecting part by using a multi-nozzle spraying device, wherein the cell is in an activated charged state or an inactivated charged state.
For the sake of illustration, fig. 3 shows a schematic view of a two-nozzle spray device, 301 and 302 in fig. 3 respectively show a first nozzle and a second nozzle, and 2 nozzles are respectively connected to respective component carriers, wherein the first nozzle 301 is connected to the component carrier of the first component, the second nozzle 302 is connected to the component carrier of the second component, and the first component and the second component are respectively sprayed out through the respective nozzles by a pressure device (not shown).
In order to prevent the multi-component liquid material from generating chemical reaction in the same nozzle structure, and thus prevent each component from being sprayed into a uniform solid insulating film on the outer surface of the cell casing, the outer surface of the top cover, and the outer surface of the connecting portion, the embodiment of the present application employs a multi-nozzle spraying apparatus to spray the multi-component liquid material onto the outer surface of the cell casing, the outer surface of the top cover, and the outer surface of the connecting portion, wherein the multi-nozzle spraying apparatus includes a plurality of independent nozzle structures (for convenience of description, fig. 3 shows a schematic diagram of a two-nozzle spraying apparatus, in practical applications, the multi-nozzle spraying apparatus may include 3, 4, or 5 nozzles, and is not specifically limited herein), and each component in the multi-component liquid material is sprayed through a corresponding independent nozzle structure in the multi-nozzle spraying apparatus, so as to avoid early contact and early reaction of each component, so as to avoid influencing the formation of uniform insulating films on the outer surface of the cell shell, the outer surface of the top cover and the outer surface of the connecting part by the multi-component liquid material.
Specifically, the multi-component liquid material herein includes, but is not limited to, at least one component of epoxy, polyurethane, acrylate, and silicone, and a curing agent.
Wherein, the epoxy resin has the following advantages:
1. high bonding strength: the bonding strength of epoxy resin glue is the front in synthetic adhesives.
2. The curing shrinkage is small, and the shrinkage of the epoxy resin adhesive in the adhesive is minimum. For example: phenolic resin glue: 8 to 10 percent; organic silicon resin adhesive: 6-8%, polyester resin glue: 4 to 8 percent; epoxy resin glue: 1-3%, if the modified epoxy resin adhesive has a shrinkage rate of 0.1-0.3%, and a thermal expansion coefficient of 6.0 × 10-5/℃。
3. The chemical resistance is good: the ether group, the benzene ring and the aliphatic hydroxyl group in the curing system are not easy to be corroded by acid and alkali. In seawater and stoneOil, kerosene, 10% H2SO4、10％HCl、10％HAc、10％NH3、10％H3PO4And 30% Na2CO3Can be used for two years; and at 50% H2SO4And 10% HNO3Soaking at normal temperature for half a year; the performance of the product is kept unchanged after 10 percent NaOH (100 ℃) is soaked for one month.
4. Excellent electrical insulation: the breakdown voltage of the epoxy resin may be greater than 35 kv/mm.
5. The heat resistance of the epoxy cured product is generally 80 to 100 ℃. The heat resistant varieties of epoxy resins can reach 200 ℃ or higher.
6. The manufacturability is good. The epoxy resin generates substantially no low-molecular volatiles when cured, and can be molded by low-pressure molding or contact molding. Can be matched with various curing agents to manufacture environment-friendly coatings such as solvent-free, high-solid, powder coatings, water-based coatings and the like.
The high adhesive strength of the epoxy resin ensures that the insulating film is not easy to fall off and has good wear resistance after being formed, in addition, the electrical insulation property of the epoxy resin is excellent, the insulation property and the safety of the solid insulating film are further ensured, and the heat resistance and the chemical resistance of the epoxy resin also further ensure the integrity and the wear resistance of the insulating film after being formed.
Among them, polyurethane has the following advantages:
1. excellent wear resistance, low-temperature flexibility and wider adjustable range of performance;
2. the mechanical strength is high, the adhesion is good, the elasticity is good, and the recovery is excellent, so that the method is suitable for dynamic seams;
3, the oil resistance is excellent, the biological aging resistance is good, and the price is moderate;
4. the cured adhesive layer has the advantages of high hardness, high transparency, high brightness, capability of being pressurized and quickly cured at room temperature, good heat resistance and excellent electrical property.
5. The oil resistance and the cold resistance are good.
Because of the excellent wear resistance and oil resistance of the polyurethane, the insulating film has stronger pollution resistance in the use process, and the service life of the insulating film is further ensured by better heat resistance and cold resistance.
Among them, acrylates have the following advantages:
1. and rapidly cured at room temperature, typically from a few minutes to tens of minutes.
2. Can be cured at low temperature, even below 0 ℃.
3. The adhesive is suitable for bonding most of metal and non-metal materials.
4. The surface treatment requirements of the materials to be bonded are not strict, and even oil-surface bonding can be realized.
5. The mixing ratio of the two components is not critical.
6. The bonding strength is high.
Because the acrylate has the characteristics of low-temperature curing, high bonding strength and loose requirements on the surface treatment of the bonding material, the forming speed and the forming rate of the insulating film are accelerated when the insulating film is sprayed on the outer surface of the power battery.
Among them, silicone resin has the following advantages:
1. as a thermosetting polysiloxane polymer with a highly crosslinked structure, the thermosetting polysiloxane polymer has the dual characteristics of organic resin and inorganic materials, has unique physical and chemical properties, and has good electrical insulation property, temperature resistance and waterproof effect.
2. The silicon resin has better weather resistance than common organic resin. Therefore, the material is ideal for protecting the surface layer by heat-resistant, heat-resistant and moisture-proof treatment.
Because the silicone resin has good electrical insulation, temperature resistance and waterproof effect, the anti-pollution performance of the insulation film is enhanced.
In addition, in order to ensure that the epoxy resin, the polyurethane, the acrylate and the silicon resin are solidified to form a film on the surface of the power battery, the multi-component liquid material further comprises a curing agent, so that the multi-component liquid material can be solidified to form a film when being sprayed to the outer surface of the power battery.
Further, in order to ensure the adhesiveness, thickness and insulation of the solid insulation film, in the embodiment of the present application, it is preferable that the viscosity of the components in the multi-component liquid material is set to 20 to 3000mpa.s, and the density of each component in the multi-component liquid material is 0.5 to 2.5g/ml, so that after each component is sprayed on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part, a dense insulation film can be formed.
In addition, in order to ensure the insulating property of the insulating film, it is preferable that the resistance value of the solid insulating film in the embodiment of the present application is not less than 100M Ω/mm.
According to the embodiment of the application, each component in the multi-component liquid material is sprayed through the corresponding independent nozzle structure, so that the components are mixed outside the nozzle structure and then sprayed to the outer surface of the battery cell shell, the outer surface of the top cover and the outer surface of the connecting part, the advanced contact and the advanced reaction of the multi-component liquid material are avoided, and the uniformity of the insulating film is ensured.
In addition, solid-state insulating film in this application is at the in-process of spraying to the surface of electricity core shell, top cap surface and connecting portion, the electricity core is in the active state that the equipment is accomplished and electrified, or is in the inactive state that the equipment is accomplished and not electrified, thereby avoided spraying solid-state insulating film earlier to the surface of electricity core shell surface, top cap surface and connecting portion, the redundant problem of technology that the equipment electricity core caused, also the coating process of solid-state insulating film in this application can simplify operation process, and insulating film's homogeneity, integrality and adhesion are good after the shaping, insulating nature and security that insulating film has further been guaranteed.
Based on the embodiment shown in fig. 2, in order to sufficiently mix the multi-component liquid material to ensure the uniformity of the insulating film when the multi-component material is sprayed on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting portion, the following steps may be further performed, and referring to fig. 4, another embodiment of a coating process of a solid insulating film in the embodiment of the present application includes:
401. and spraying each component in the multi-component liquid material to the air on the outer surface of the battery cell shell through the corresponding independent nozzle structure by using the multi-nozzle spraying device, and mixing, so that the mixed multiple components are sprayed to the outer surface of the battery cell shell, the outer surface of the top cover and the outer surface of the connecting part.
In the embodiment shown in fig. 2, each component may be sprayed to the outer surface of the cell casing, the outer surface of the top cover, and the outer surface of the connecting portion by using each independent nozzle in the multi-nozzle spraying device, so that each component is mixed and reacted on the outer surface of the cell casing, the outer surface of the top cover, and the outer surface of the connecting portion, and then cured into a uniform insulating film.
However, in order to ensure the uniformity of the insulating film, each component in the multi-component liquid material may be sprayed to the air on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part through the corresponding independent nozzle structure by using the multi-nozzle spraying device (preferably, each component may be sprayed to the air on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part simultaneously to ensure the mixing reaction effect of each component), further, the pressure inside each nozzle may be adjusted to make each component sprayed by each independent nozzle structure to be atomized and fully mixed in the air, and then sprayed to the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part, so that the fully reacted multi-component liquid material forms a layer of uniform and dense insulating film on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting part, thereby more effectively guaranteed the homogeneity and the insulating nature of film, and even insulating film can prevent the film because the thickness inconsistent and the damage problem that appears when the atress is inhomogeneous that leads to, has also promoted insulating film's life.
Next, a power battery in an embodiment of the present application is described, referring to fig. 5, where an embodiment of the power battery in the embodiment of the present application includes:
a plurality of battery cells 501 and a carrying device for carrying a plurality of battery cells, where for the description of the battery cells 501, reference may be made to the embodiments described in fig. 1 to fig. 4 in this application, and details are not repeated here.
The carrying device may be a rectangular frame, a square frame, a polygonal frame, or any other shape frame, as long as it can carry a plurality of battery cells and make the plurality of battery cells in a fixed state in the carrying device during use, and the shape and material (such as aluminum material, stainless steel material, or aluminum alloy material) of the carrying device are not specifically limited herein.
As an optional embodiment, the carrying device in the embodiment of the present application is a rectangular frame, and specifically includes a heat dissipation plate 502 disposed at a bottom side of a plurality of battery cells, and a plurality of end plates 503 and a plurality of side plates 504 disposed at side surfaces of the plurality of battery cells, so as to ensure good heat dissipation of the battery cells and stability of the battery cells in the carrying device.
As an optional embodiment, a solid insulating film may be further coated on at least one of the inner and outer surfaces of the heat dissipation plate, the end plate, and the side plate to ensure insulation and safety between the battery cell and the diffusion plate, the end plate, and the side plate, where a coating process of the solid insulating film on the surface of the heat dissipation plate, the end plate, or the side plate is similar to a coating process of the solid insulating film on the outer surface of the battery cell case, the outer surface of the top cover, and the outer surface of the connection portion in the embodiment of the present application, and is not described herein again.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. The utility model provides an electric core, its characterized in that, electric core includes cell shell, positive terminal, negative terminal and top cap, wherein, positive terminal with negative terminal set up in the surface of top cap, the top cap with cell shell passes through connecting portion and connects to form confined inner space, inner space is used for bearing electric core, electric core still including the coating in cell shell surface, top cap surface and the integral type solid state insulation film of connecting portion surface.
2. The cell of claim 1, wherein the solid insulating film is formed by spraying a multi-component liquid material onto the outer surface of the cell casing, the outer surface of the top cap, and the outer surface of the connecting portion using a multi-nozzle spraying device, and wherein the cell is in an activated charged state or an inactivated charged state.
3. The battery cell of claim 2, wherein the multi-nozzle spraying device comprises a plurality of independent nozzle structures, and each component of the multi-component liquid material is sprayed through a corresponding independent nozzle structure of the multi-nozzle spraying device, so that the multi-component liquid material forms a uniform and integrated solid insulating film on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting portion, wherein the multi-component liquid material comprises one component of epoxy resin, polyurethane, acrylate and silicone resin and a curing agent.
4. The cell of claim 3, wherein the solid insulating film is formed by spraying each of the multi-component liquid materials through respective individual nozzle structures by the multi-nozzle spraying device into the air on the outer surface of the cell casing, so that the mixed components are sprayed on the outer surface of the cell casing, the outer surface of the top cover and the outer surface of the connecting portion.
5. The electrical core of claim 2, wherein the viscosity of each component of the multi-component liquid material is 20-3000mpa.s, and the density of each component of the multi-component liquid material is 0.5-2.5 g/ml.
6. The electrical core of any one of claims 1 to 5, wherein the electrical resistance of the solid state insulating film is not less than 100M Ω/mm.
7. A power battery, characterized by comprising a plurality of cells according to any one of claims 1 to 6 and a carrier device carrying the plurality of cells.
8. The power battery of claim 7, wherein the carrying device comprises a heat dissipation plate disposed on a bottom side of the plurality of cells, and a plurality of end plates and a plurality of side plates disposed on side surfaces of the plurality of cells.
9. The power cell according to claim 8, wherein at least one of the inner and outer surfaces of the heat dissipation plate, the end plate, and the side plate is coated with a solid insulating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121404325.8U CN216850131U (en) | 2021-06-23 | 2021-06-23 | Battery core and power battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121404325.8U CN216850131U (en) | 2021-06-23 | 2021-06-23 | Battery core and power battery |
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| CN216850131U true CN216850131U (en) | 2022-06-28 |
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| CN202121404325.8U Active CN216850131U (en) | 2021-06-23 | 2021-06-23 | Battery core and power battery |
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