CN115295890A - Roll core, battery with hollow structure, assembly method and electric device - Google Patents

Roll core, battery with hollow structure, assembly method and electric device Download PDF

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Publication number
CN115295890A
CN115295890A CN202211132994.3A CN202211132994A CN115295890A CN 115295890 A CN115295890 A CN 115295890A CN 202211132994 A CN202211132994 A CN 202211132994A CN 115295890 A CN115295890 A CN 115295890A
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China
Prior art keywords
inner tube
positive
winding core
battery
negative
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CN202211132994.3A
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Chinese (zh)
Inventor
尚随军
王林
胡先刚
吴刚
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Suzhou Youlionbattery Inc
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Suzhou Youlionbattery Inc
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Priority to CN202211132994.3A priority Critical patent/CN115295890A/en
Publication of CN115295890A publication Critical patent/CN115295890A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6566—Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a winding core, a battery with a hollow structure, an assembly method and an electric device, wherein a hollow cavity formed along the length direction is arranged in the winding core, and an inner pipe assembly is arranged in the hollow cavity; the positive plate is divided into a positive coating area and a positive empty foil area, the surface of the negative plate is divided into a negative coating area and a negative empty foil area, and the diaphragm covers the positive coating area and the negative coating area; and during winding, the positive electrode empty foil area and the negative electrode empty foil area are respectively positioned at two sides of the winding direction, and the positive electrode lug and the negative electrode lug which are positioned at two ends of the winding core are respectively formed after winding. After the inner tube subassembly inserted the cavity, can play the supporting role to rolling up the core, effectively prevent to roll up the core and collapse in the use, increased the heat radiating area who rolls up core inside, the heat of rolling up core inside is transmitted fast effectively to multiple cooling methods such as cooperation natural cooling, forced air cooling or liquid cooling, is applicable to big multiplying power charge-discharge more.

Description

Roll core, battery with hollow structure, assembly method and electric device
Technical Field
The invention belongs to the technical field of batteries, and relates to a winding core, a battery with a hollow structure, an assembly method and an electric device.
Background
The lithium ion battery has the advantages of environmental protection, high energy density, high output voltage, small self-discharge and the like, and is widely applied to various scenes of life, such as mobile phones, notebooks, automobiles and the like. With the development of the times, people have higher and higher requirements on lithium ion batteries, and especially, the requirements on power, energy density and safety performance of the lithium ion batteries are more urgent.
The cylindrical battery roll core is formed by winding a diaphragm and a pole piece around a roll needle with a certain diameter, the diameter of the roll needle is correspondingly increased along with the increase of the size of the cylindrical battery, after the roll is finished, the roll needle is drawn out from the middle of the roll core to form a hollow area at the position of the original roll needle, the hollow area and the flat end faces of the lugs at two ends are kneaded to form a certain airtight heat-conduction-free space, and the overcurrent row and the lugs are welded and fixed and are connected with the cover plate.
The cylindrical battery has higher safety performance in the whole life cycle due to the characteristics of battery thermal runaway propagation blocking, good sealing performance and high product consistency. The traditional 18650 and 21700 cylindrical batteries mostly adopt the single-pole lug and double-pole lug processes, the power and energy density of the battery are low, the internal resistance is large, and the full-lug large cylindrical battery is an effective way for solving the problem. Along with the increase of the size of the cylindrical battery, the heat in the battery is difficult to diffuse to the surface of the battery, especially along with the increasing demand of the battery market for quick charging, the charging multiplying power is also increased, and the larger the charging multiplying power is, the higher the temperature rise of the battery is meant. Therefore, how to rapidly discharge the heat inside the battery is an urgent problem to be solved.
At present, prior art utilizes the battery to roll up a core metal casing and dispels the heat to the air to the realization rolls up the inside temperature of core in reducing the battery use, but the metal casing heat dissipation that relies on the battery alone has caused the inside temperature imbalance of battery, especially to rolling up core formula cylinder battery, owing to roll up the core formation cavity region after the needle is taken out, cylinder battery machine-shaping back, the inside negative pressure state that is in of battery, the cavity region does not have effective heat conduction material, kneads the space that the flat terminal surface formed and has certain leakproofness with both ends utmost point ear. In the cylindrical battery charge-discharge process, the inside position to central cavity position from being close to the casing of battery, different regions are because material coefficient of heat conductivity is different, and the difference of heat transfer speed is great, and temperature ladder distributes, and it is higher more close to the regional temperature in center, and this region gathers a large amount of heats and can't derive fast in charge-discharge process, forms central thermal field, and intermediate position pole piece degradation is serious.
And prior art does not have very effectual solution yet to the unbalanced phenomenon of the inside temperature of roll core in the battery use, and the unbalanced phenomenon of the inside temperature of battery can make the battery have the potential safety hazard of burning, explosion to accelerate battery performance degradation, reduced the uniformity of battery, and then influence the life of whole group battery. Therefore, it is necessary to improve the internal structure of the conventional jelly-roll type cylindrical battery to solve the problem of the unbalance of the internal temperature of the battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a winding core, a battery with a hollow structure, an assembly method and an electric device.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a winding core, which is formed by sequentially laminating and winding a positive plate, a diaphragm and a negative plate, wherein a hollow cavity formed along the length direction is arranged in the winding core, and an inner pipe assembly is arranged in the hollow cavity;
the positive plate is divided into a positive coating area and a positive empty foil area, the surface of the negative plate is divided into a negative coating area and a negative empty foil area, and the diaphragm covers the positive coating area and the negative coating area; and during winding, the positive electrode empty foil area and the negative electrode empty foil area are respectively positioned at two sides of the winding direction, and a positive electrode lug and a negative electrode lug which are positioned at two ends of the winding core are respectively formed after winding.
The inner pipe assembly is arranged in the hollow cavity of the winding core, and the winding core has the advantages that:
(1) After the inner pipe assembly is inserted into the hollow cavity, the support effect on the winding core can be achieved, the winding core is effectively prevented from collapsing in the using process, and the cycle life and the safety performance of the winding core are prolonged;
(2) The inner pipe assembly is of a hollow structure, so that the heat dissipation area inside the winding core is increased, after the battery is assembled, the inside of the winding core can be directly connected with the battery shell through the inner pipe assembly, and the heat inside the winding core can be quickly and effectively transferred by matching with various cooling modes such as natural cooling, air cooling or liquid cooling, and the like, so that the inner pipe assembly is more suitable for high-rate charge and discharge;
(3) The invention improves the heat conduction capability of the whole winding core by arranging the inner tube assembly, quickly dissipates the heat of the central area to keep heat balance, improves the stability of the battery in long-term use, optimizes the cycle performance of the battery, can reduce the design pressure of the winding core system to a certain extent and relaxes the design requirement of the system; the inner pipe assembly is simple and practical in structure, the whole winding core is axially penetrated from the winding core, the temperature inside the winding core is uniformly balanced while heat is dissipated, and the phenomenon that too much heat is accumulated in the winding core to cause fire and explosion is effectively avoided;
(4) The inner pipe assembly is inserted into the hollow cavity of the winding core, so that the electrolyte is prevented from being accumulated in the hollow cavity of the winding core, and the performance attenuation caused by the reduction of the concentration of the internal electrolyte in the long-term use process of the winding core is avoided;
(5) According to the invention, the negative plate is provided with the negative empty foil area, the positive plate is provided with the positive empty foil area, namely, partial areas of the negative plate and the positive plate are not coated with the battery slurry, so that the battery slurry can not completely obstruct the heat dissipation of the positive plate and the negative plate, the heat dissipation rate of the positive plate and the negative plate is further improved, the heat of a winding core during working or short circuit is prevented from being concentrated in the positive plate or the negative plate, the problem that the positive plate or the negative plate is burnt due to overheating is avoided, and the service life of the lithium battery is prolonged.
It should be noted that the material of the inner tube assembly is not specifically required or limited, and a metal material with a high thermal conductivity, such as copper, aluminum, iron, or zinc, is preferably used in the present invention, so that the heat dissipation performance is good, and the heat can be quickly conducted to the battery case.
The inner tube assembly is a tubular structure with openings at two ends and axial through, and the inner space of the inner tube assembly can be freely penetrated by air so as to realize heat dissipation inside the winding core; certainly, the liquid cooling heat dissipation device can also be used as a liquid cooling channel to use liquid cooling heat dissipation, and compared with air cooling heat dissipation, the liquid cooling heat dissipation effect is better. The structure of the invention can be further improved on the basis of the tubular structure, thereby further improving the heat dissipation effect, for example, the outer surface of the tubular structure is provided with a plurality of bulges, the heat dissipation surface area is increased, and the heat dissipation effect is improved.
It should be noted that the cross-sectional shape of the inner pipe assembly of the present invention is not particularly limited and may be circular or polygonal. The winding core provided by the invention is drawn out after the winding needle is wound, and the inner pipe assembly is inserted into the hollow cavity formed in the winding core, so that the sectional area of the inner pipe assembly is slightly smaller than that of the hollow cavity for smooth insertion.
As a preferred technical solution of the present invention, the inner tube assembly includes an inner tube and a base, the inner tube and the base are disposed along a length direction of the hollow cavity, the base is located at one end of the negative electrode tab of the inner tube, the inner tube is perpendicular to the base, a negative heat dissipation hole is disposed at a center of the base, a negative opening end of the inner tube corresponds to the negative heat dissipation hole, and the negative opening end of the inner tube is communicated with the outside through the negative heat dissipation hole.
The surface of the base is tightly attached to the end face of the negative electrode lug and is fixedly welded with the negative electrode lug.
As a preferable technical solution of the present invention, the inner tube is wrapped with a first insulating layer at an end close to the positive tab.
And the periphery of the positive lug is wrapped with a second insulating layer.
According to the invention, the periphery of one end of the inner tube, which is close to the positive lug, is wrapped with the first insulating layer, the insulating layer is optionally coated by adopting a spin-coating method, one end of the inner tube is immersed into the liquid insulating material and rotates at a high speed, so that the liquid insulating material can be uniformly attached to one end of the inner tube, and then the insulating layer material is tightly attached to the outer surface of the inner tube through high-temperature curing.
It should be noted that the material of the first insulating layer and the second insulating layer is not particularly required or selected in the present invention, and preferably, polytetrafluoroethylene is used as the insulating material. The polytetrafluoroethylene has excellent corrosion resistance, does not generate chemical reaction in electrolyte at all, can still be stably attached to the surface of the inner tube when the temperature in the battery is sharply increased, and prevents the inner tube from directly contacting with a battery pole piece, thereby preventing the short circuit in the winding core.
In a second aspect, the invention provides a battery with a hollow structure, the battery comprises a shell and a top cover positioned at an opening at one end of the shell, the winding core with the hollow structure in the first aspect is placed in the shell, and the opening ends at two sides of the inner tube assembly are communicated with the outside.
The battery has an axially-through hollow structure, both ends and the inside of the inner tube assembly are communicated with the outside, and heat in the middle area of the winding core can be respectively dissipated from both ends of the inner tube assembly. Therefore, the hollow structure is actually formed by the shell and the inner pipe assembly, an annular cavity is formed between the inner pipe assembly and the shell, the winding core is accommodated in the annular cavity, and the inner peripheral surface of the inner pipe assembly is also used as a heat dissipation surface of the shell, so that the surface area of the battery is increased, and the heat dissipation of the winding core is facilitated. In addition, at the charge-discharge in-process, roll up core central point and put the most difficult region of heat dissipation, the temperature is the highest, can be so that roll up core central point and regional direct and external environment intercommunication through the inner tube subassembly, can take out the radiating heat in core central point region when the air current passes the inner tube subassembly to effectively reduce the inside temperature of battery, improved the uniformity of rolling up core temperature.
As a preferred technical solution of the present invention, the top cover includes a cap and a cover plate of an annular structure disposed around the outer periphery of the cap, the center of the cap is provided with an anode heat dissipation hole, the anode opening end of the inner tube corresponds to the anode heat dissipation hole, and the anode opening end of the inner tube is communicated with the outside through the anode heat dissipation hole.
And a sealing ring is arranged between the cover plate at the outer edge of the cover cap and the cover plate.
In the invention, the top cover consists of a cap, a cover plate and a sealing ring, the periphery of the cover plate is welded and fixed with the outer edge of the open end of the shell, and the cap is connected with the cover plate in a sealing way through the sealing ring. In order to ensure the connection tightness between the cover plate and the shell, the structure of the cover plate is optimally designed, an annular groove is arranged on the outer edge of the cover plate along the circumferential direction, and the annular groove is connected with the edge of an opening at one end of the shell and is fixed by laser welding.
The shell is a steel shell.
It should be noted that the internal structure of the battery provided by the invention is designed for a steel-shell cylindrical battery. The lithium battery shell mainly comprises three types, namely a steel shell, an aluminum shell and an aluminum-plastic film, wherein the aluminum-plastic film is not widely applied to the cylindrical lithium ion battery due to the problems of high cost, difficult packaging and the like. The steel shell is widely applied to cylindrical lithium ion batteries because of high mechanical strength and low manufacturing cost. However, the steel shell is easy to rust, a layer of nickel is usually plated on the surface of the steel shell for rust prevention, and the nickel has certain toxicity and is harmful to human bodies. And in order to prevent electrochemical corrosion of steel at high potentials, the steel casing of lithium batteries is often designed to be negatively charged. The aluminum shell has the advantages of corrosion resistance, light weight, good processing performance and the like, so that the aluminum shell tends to gradually replace a steel shell; however, aluminum is mechanically weak and easily deformable, requiring more protection against collisions than steel can batteries, and in addition, the aluminum housing of lithium batteries is often designed to be positively charged in order to prevent electrochemical corrosion of aluminum at low potentials. By combining the above, the internal structure design and the preparation process of the steel-shell battery and the aluminum-shell battery have great difference. The application provides a battery inner structure includes the connected mode between roll core and the casing to and assembly method etc. is particularly useful for the steel-shelled battery.
As a preferable technical scheme, one end of the positive lug of the winding core is provided with a current collecting disc, the positive lug is welded and fixed with the current collecting disc after being bent or kneaded, and the current collecting disc is welded and fixed with the cover cap.
In the invention, the positive lug at one end of the winding core is welded and connected with the current collecting disc after being bent or flattened, so that the purpose is to eliminate the gap formed by winding the positive lug so as to improve the conductivity of the positive lug, and in addition, the positive lug can play a role of fixing the winding core, and the winding core can be prevented from displacement after the battery is in severe collision, thereby improving the safety performance of the battery. The positive pole lug is welded with the current collecting disc after being bent or flattened, so that the welding area of the pole lug can be increased, and the rate performance of the battery is improved.
The base of the inner tube assembly is fixedly welded with the opening at one end of the shell, the base of the inner tube assembly serves as the bottom cover of the battery, and the open end of the negative electrode of the inner tube is communicated with the outside through the negative heat dissipation hole.
And an annular insulating pad is arranged on the outer edge of the surface of the current collecting disc.
As a preferred technical scheme of the invention, the surface of the current collecting disc is provided with at least two sunken sink grooves along the circumferential direction, and the bottom surfaces of the sink grooves are welding areas; the sinking grooves are of fan-shaped structures, and a raised reinforcing rib is formed between every two adjacent sinking grooves.
The central part of the current collecting disc is provided with a positioning hole, the reinforcing ribs are distributed in a radial shape by taking the positioning hole as the center, the position of the positioning hole corresponds to the position of an opening at one end of the inner tube, and the opening at the positive electrode end of the inner tube is communicated with the outside through the positioning hole and the positive heat dissipation hole in sequence.
The aperture of the positioning hole is larger than the diameter of the inner tube.
In the invention, the center of the current collecting disc is provided with a positioning hole, the aperture of the positioning hole is slightly larger than the diameter of the inner tube, and the opening at the positive electrode end of the inner tube is communicated with the outside through the positioning hole for heat dissipation. Be equipped with the sunken groove that a plurality of is the integrative stamping forming of circumference equipartition on the current collection dish, sunken tank bottom surface is as welding area and positive lug welded fastening, form the strengthening rib between the adjacent sunken groove, the electrolyte opening has still been seted up on the strengthening rib, the outer fringe of current collection dish still is equipped with the portion of bending of turning over the book downwards, the portion lower surface of bending and sunken tank bottom surface are in the coplanar, sunken tank bottom surface and the positive lug of book core rub the terminal surface after the wrinkle through laser pulse welding, it is equipped with the notes liquid hole with strengthening rib corresponding position department in the portion of bending, pour into electrolyte into in the casing through annotating the liquid hole.
On the basis of ensuring the heat dissipation effect of the winding core and the temperature balance, in order to further improve the safety of the battery in the using process, the structure of the inner tube is optimized and improved, the two ends of the inner tube are sealed, a pressure release valve is arranged at one end close to the positive lug, and meanwhile, the inner tube is filled with a phase change material. When the temperature in the battery is too high, the phase-change material can absorb redundant heat, and heat absorption can be realized while heat dissipation is realized. When lithium ion battery takes place to cross to charge, cross to put, bear high temperature, receive acupuncture or when extrudeing, battery inside temperature and pressure rise suddenly, the inside heat that produces of battery has surpassed phase change material's heat absorption limit, internal pressure sharply increases, phase change material can be heated and take place to decompose this moment, and produce a large amount of incombustible gases in the short time, and then break through the relief valve that sets up at inner tube one end, make inner tube and external intercommunication, the gas in the inner tube can be discharged, the probability that the battery takes place further detonation has been reduced. In addition, because the battery is of a hollow structure, even if the inner pipe is communicated with the outside, the internal structure of the battery is not influenced, and the battery can still be normally used.
In addition, because the electrolyte can not enter the inner tube, the phase-change material is filled in the inner tube, so that the direct contact between the phase-change material and the electrolyte is avoided, and the working efficiency of the battery is prevented from being influenced by the chemical reaction between the phase-change material and the electrolyte. The phase-change material is filled in the inner tube, the inner space of the inner tube is effectively utilized, the volume of the battery is not remarkably increased, and the balance of the internal temperature and the internal pressure of the battery is effectively realized.
In a third aspect, the present invention provides an assembling method of the battery having a hollow structure according to the second aspect, the assembling method including:
firstly, inserting an inner pipe assembly into a hollow cavity of a winding core; then the material is put into a shell, a positive tab of a winding core is welded with a top cover, a negative tab of the winding core is connected with the bottom surface of the shell, and the open ends at the two sides of the inner tube component are communicated with the outside; and finally, welding and fixing the top cover and the open end of the shell, and injecting electrolyte into the shell to obtain the battery.
As a preferred technical solution of the present invention, the assembling method specifically includes the steps of:
(1) The positive plate, the diaphragm and the negative plate are stacked and wound to form a winding core with a hollow cavity, and the positive lug at one end of the winding core is bent or kneaded to be flat;
(2) Inserting the inner tube into the hollow cavity of the winding core, so that the negative electrode lug is tightly attached to the base and welded and fixed to form a winding core assembly consisting of the winding core, the inner tube and the base;
(3) The winding core assembly is arranged in a shell, the outer edge of an opening at one end of the shell is fixedly welded with the outer edge of the base, and the opening end of the negative electrode of the inner tube is communicated with the outside through a negative electrode heat dissipation hole in the base;
(4) Welding the positive lug of the winding core with the current collecting disc, paving an insulating pad on the outer edge of the surface of the current collecting disc, mechanically grooving the open end of the shell, and injecting electrolyte into the shell;
(5) Welding the current collecting disc to the cap, wherein the open end of the anode of the inner tube is communicated with the outside through the positioning hole of the current collecting disc and the anode heat dissipation hole on the cap;
(6) The top cover is arranged in the shell rolling groove, and the open end of the positive pole of the inner tube, the top cover and the shell rolling groove are fixedly sealed through mechanical extrusion to form the battery with a hollow structure.
In a fourth aspect, the present invention provides an electric device including the battery having a hollow structure according to the second aspect.
Compared with the prior art, the invention has the beneficial effects that:
(1) After the inner pipe assembly is inserted into the hollow cavity, the support effect on the winding core can be achieved, the winding core is effectively prevented from collapsing in the using process, and the cycle life and the safety performance of the winding core are prolonged;
(2) The inner pipe assembly is of a hollow structure, so that the heat dissipation area inside the winding core is increased, after the battery is assembled, the inside of the winding core can be directly connected with the battery shell through the inner pipe assembly, and the heat inside the winding core can be quickly and effectively transferred by matching with various cooling modes such as natural cooling, air cooling or liquid cooling, and the like, so that the inner pipe assembly is more suitable for high-rate charge and discharge;
(3) The invention improves the heat conduction capability of the whole winding core by arranging the inner tube assembly, quickly dissipates the heat of the central area to keep heat balance, improves the stability of the battery in long-term use, optimizes the cycle performance of the battery, can reduce the design pressure of the winding core system to a certain extent and relaxes the design requirement of the system; the inner pipe assembly is simple and practical in structure, the whole winding core is axially penetrated from the winding core, the temperature inside the winding core is uniformly balanced while heat is dissipated, and the phenomenon that too much heat is accumulated in the winding core to cause fire and explosion is effectively avoided;
(4) The inner pipe assembly is inserted into the hollow cavity of the winding core, so that the electrolyte is prevented from being accumulated in the hollow cavity of the winding core, and the performance attenuation caused by the reduction of the concentration of the internal electrolyte in the long-term use process of the winding core is avoided;
(5) According to the invention, the negative plate is provided with the negative empty foil area, the positive plate is provided with the positive empty foil area, namely, partial areas of the negative plate and the positive plate are not coated with the battery slurry, so that the battery slurry can not completely obstruct the heat dissipation of the positive plate and the negative plate, the heat dissipation rate of the positive plate and the negative plate is further improved, the heat of a winding core during working or short circuit is prevented from being concentrated in the positive plate or the negative plate, the problem that the positive plate or the negative plate is burnt due to overheating is avoided, and the service life of the lithium battery is prolonged.
Drawings
FIG. 1 is a front view of a battery according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of the appearance of a battery according to an embodiment of the present invention;
FIG. 3 is an exploded view of a battery according to an embodiment of the present invention;
FIG. 4 is a top view of a battery according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a battery according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a heat dissipation direction of a battery according to an embodiment of the present invention;
FIG. 7 is a schematic view of an inner tube assembly according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of an inner tube assembly provided in accordance with an embodiment of the present invention;
FIG. 9 is a schematic structural view of a collecting plate and a cap according to an embodiment of the present invention;
wherein, 1-shell; 2-a top cover; 3-an inner tube assembly; 4-capping; 5-sealing ring; 6-cover plate; 7-an insulating pad; 8-a collector tray; 9-a second insulating layer; 10-a winding core; 11-an inner tube; 12-a base; 13-a first insulating layer; 14-sinking a tank; 15-reinforcing ribs.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments.
In one embodiment, the present invention provides a winding core 10, wherein the winding core 10 is formed by sequentially laminating a positive electrode sheet, a separator and a negative electrode sheet and then winding, a hollow cavity formed along a length direction is provided inside the winding core 10, and an inner tube assembly 3 (shown in fig. 5) is provided inside the hollow cavity;
the positive plate is divided into a positive coating area and a positive empty foil area, the surface of the negative plate is divided into a negative coating area and a negative empty foil area, and the diaphragm covers the positive coating area and the negative coating area; during winding, the positive electrode empty foil area and the negative electrode empty foil area are respectively positioned at two sides of the winding direction, and a positive electrode lug and a negative electrode lug which are positioned at two ends of the winding core 10 are respectively formed after winding.
The inner pipe assembly 3 is arranged in the hollow cavity of the winding core 10, and the winding core has the advantages that:
(1) After the inner pipe assembly 3 is inserted into the hollow cavity, the support effect on the roll core 10 can be achieved, the roll core 10 is effectively prevented from collapsing in the using process, and the cycle life and the safety performance of the roll core 10 are prolonged;
(2) The inner tube assembly 3 provided by the invention is of a hollow structure, so that the heat dissipation area inside the winding core 10 is increased, after the battery is assembled, the inside of the winding core 10 can be directly connected with the battery shell 1 through the inner tube assembly 3, and the heat inside the winding core 10 is quickly and effectively transferred by matching with various cooling modes such as natural cooling, air cooling or liquid cooling, so that the inner tube assembly is more suitable for high-rate charge and discharge;
(3) The invention improves the heat conduction capability of the whole winding core 10 by arranging the inner tube component 3, quickly radiates the heat in the central area to keep the heat balance, improves the stability of the battery in long-term use, optimizes the cycle performance of the battery, can reduce the design pressure of the winding core 10 system to a certain extent, and relaxes the design requirement of the system; the inner pipe assembly 3 is simple and practical in structure, axially penetrates through the whole winding core 10 from the winding core 10, so that the temperature inside the winding core 10 is uniformly balanced while heat is dissipated, and the phenomenon that too much heat is accumulated in the winding core 10 to cause fire and explosion is effectively avoided;
(4) The inner tube assembly 3 is inserted into the hollow cavity of the winding core 10, so that the electrolyte is prevented from being accumulated in the hollow cavity of the winding core 10, and performance attenuation caused by the reduction of the concentration of the internal electrolyte in the long-term use process of the winding core 10 is avoided;
(5) In the invention, the negative plate is provided with the negative empty foil area, the positive plate is provided with the positive empty foil area, namely, partial areas of the negative plate and the positive plate are not coated with the battery slurry, so that the battery slurry can not completely obstruct the heat dissipation of the positive plate and the negative plate, the heat dissipation rate of the positive plate and the negative plate is further improved, the heat of the winding core 10 in working or short circuit is prevented from being concentrated in the positive plate or the negative plate, the problem that the positive plate or the negative plate is burnt due to overheating is avoided, and the service life of the lithium battery is prolonged.
It should be noted that, the material of the inner tube assembly 3 of the present invention is not particularly limited, and a metal material with a high thermal conductivity, such as copper, aluminum, iron, or zinc, is preferably used, so that the heat dissipation performance is good, and the heat can be quickly conducted to the battery case 1.
It should be noted that the main body of the inner tube assembly 3 is a tubular structure with openings at both ends and axial through, and the inner space of the inner tube assembly can be freely penetrated by air so as to realize heat dissipation inside the winding core 10; certainly, the liquid cooling heat dissipation device can also be used as a liquid cooling channel to use liquid cooling heat dissipation, and compared with air cooling heat dissipation, the liquid cooling heat dissipation effect is better. The structure of the invention can be further improved on the basis of the tubular structure, thereby further improving the heat dissipation effect, for example, the outer surface of the tubular structure is provided with a plurality of bulges, the heat dissipation surface area is increased, and the heat dissipation effect is improved.
It should be noted that the cross-sectional shape of the inner pipe assembly 3 according to the present invention is not particularly limited and may be circular or polygonal. Because the winding core 10 provided by the invention is drawn out after the winding needle is wound, and the inner tube component 3 is inserted into the hollow cavity formed in the winding core 10, the sectional area of the inner tube component 3 is slightly smaller than that of the hollow cavity for smooth insertion.
Further, as shown in fig. 7 and 8, the inner tube assembly 3 includes an inner tube 11 and a base 12 disposed along the length direction of the hollow cavity, the base 12 is located at one end of the negative electrode tab of the inner tube 11, the inner tube 11 is perpendicular to the base 12, a negative heat dissipation hole is disposed at the center of the base 12, a negative opening end of the inner tube 11 corresponds to the position of the negative heat dissipation hole, and the negative opening end of the inner tube 11 is communicated with the outside through the negative heat dissipation hole.
The surface of the base 12 is tightly attached to the end face of the negative electrode tab and is fixedly welded with the negative electrode tab.
Further, the periphery of one end of the inner tube 11 close to the positive lug is wrapped with a first insulating layer 13.
And the periphery of the positive lug is wrapped with a second insulating layer 9.
In the invention, the periphery of one end of the inner tube 11 close to the anode tab is wrapped with a first insulating layer 13, the insulating layer is optionally coated by adopting a spin coating method, one end of the inner tube 11 is immersed into a liquid insulating material and rotates at a high speed, so that the liquid insulating material can be uniformly attached to one end of the inner tube 11, and then the insulating layer material is tightly attached to the outer surface of the inner tube 11 through high-temperature curing.
It should be noted that the material of the first insulating layer 13 and the second insulating layer 9 is not particularly required or selected in the present invention, and preferably, polytetrafluoroethylene is used as the insulating material. The poly tetrachloroethylene has excellent corrosion resistance, does not generate chemical reaction in electrolyte at all, can still be stably attached to the surface of the inner tube 11 when the temperature in the battery is sharply increased, and prevents the inner tube 11 from directly contacting with a battery pole piece, thereby preventing the short circuit in the winding core 10.
In another embodiment, the present invention provides a battery having a hollow structure, as shown in fig. 1, 2, 3 and 4, the battery comprises a case 1 and a top cover 2 at an opening of one end of the case 1, a winding core 10 having a hollow structure provided in the above embodiment is placed in the case 1, and both open ends of the inner tube assembly 3 are in communication with the outside.
The battery of the invention has an axially through hollow structure, both ends and the inside of the inner tube assembly 3 are communicated with the outside, and the heat in the middle area of the winding core can be respectively radiated from both ends of the inner tube assembly 3 (as shown in fig. 6). Therefore, the hollow structure of the invention is actually a hollow structure formed by the shell 1 and the inner tube assembly 3, an annular cavity is formed between the inner tube assembly 3 and the shell 1, the winding core 10 is accommodated in the annular cavity, and the inner circumferential surface of the inner tube assembly 3 also serves as a heat dissipation surface of the shell 1, so that the surface area of the battery is increased, and the heat dissipation of the winding core 10 is facilitated. In addition, at the charge-discharge in-process, roll up core 10 central point and put the most difficult region of heat dissipation, the temperature is the highest, can be so that roll up core 10 central point and direct and external environment intercommunication through inner tube subassembly 3, can take out the radiating heat in core 10 central point region when the air current passes inner tube subassembly 3 to effectively reduced the inside temperature of battery, improved the uniformity of rolling up core 10 temperature.
Further, as shown in fig. 4, the top cap 2 includes a cap 4 and a cover plate 6 of an annular structure disposed around the periphery of the cap 4, a positive heat dissipation hole is opened at the center of the cap 4, a positive opening end of the inner tube 11 corresponds to the positive heat dissipation hole, and the positive opening end of the inner tube 11 is communicated with the outside through the positive heat dissipation hole.
As shown in fig. 3, a sealing ring 5 is disposed between the cover plate 6 and the outer edge of the cap 4.
In the invention, the top cover 2 consists of a cover cap 4, a cover plate 6 and a sealing ring 5, the periphery of the cover plate 6 is fixedly welded with the outer edge of the open end of the shell 1, and the cover cap 4 is hermetically connected with the cover plate 6 through the sealing ring 5. In order to ensure the connection tightness between the cover plate 6 and the shell 1, the structure of the cover plate 6 is optimally designed, an annular groove is arranged on the outer edge of the cover plate 6 along the circumferential direction, and the annular groove is connected with the edge of an opening at one end of the shell 1 and is fixed by laser welding.
Further, the shell 1 is a steel shell.
It should be noted that the internal structure of the battery provided by the invention is designed for a steel-shell cylindrical battery. The shell of the lithium battery mainly comprises a steel shell, an aluminum shell and an aluminum-plastic film, wherein the aluminum-plastic film is not widely applied to the cylindrical lithium ion battery due to the problems of high cost, difficult packaging and the like. The steel shell is widely applied to cylindrical lithium ion batteries because of high mechanical strength and low manufacturing cost. However, the steel shell is easy to rust, and a layer of nickel is usually plated on the surface of the steel shell for rust prevention, and the nickel has certain toxicity and is harmful to human bodies. And in order to prevent electrochemical corrosion of steel at high potentials, the steel casing of lithium batteries is often designed to be negatively charged. The aluminum shell has the advantages of corrosion resistance, light weight, good processing performance and the like, so that the aluminum shell tends to gradually replace a steel shell; however, aluminum is mechanically weak and easily deformed, requiring more protection against impact than steel-shelled batteries, and in addition, the aluminum housing of lithium batteries is often designed to be positively charged in order to prevent electrochemical corrosion of aluminum at low potentials. By combining the above, the internal structure design and the preparation process of the steel-shell battery and the aluminum-shell battery have great difference. The internal structure of the battery comprises a connection mode between the winding core 10 and the shell 1, an assembly method and the like, and is particularly suitable for steel shell batteries.
Further, as shown in fig. 3, a current collecting disc 8 is arranged at one end of the positive tab of the winding core 10, the positive tab is bent or flattened and then welded and fixed with the current collecting disc 8, and the current collecting disc 8 is welded and fixed with the cap 4.
In the invention, the positive tab at one end of the winding core 10 is welded and connected with the current collecting disc 8 after being bent or flattened, so as to eliminate the gap formed by winding the positive tab, thereby improving the conductivity of the positive tab, and in addition, the positive tab can play a role in fixing the winding core 10, and the winding core 10 can be prevented from displacement after the battery is in violent collision, thereby improving the safety performance of the battery. The positive pole lug is welded with the current collecting disc 8 after being bent or flattened, so that the welding area of the pole lug can be increased, and the rate performance of the battery is improved.
The base 12 of the inner tube component 3 is welded and fixed with the opening at one end of the shell 1, the base 12 of the inner tube component 3 is used as the bottom cover of the battery, and the opening end of the negative pole of the inner tube 11 is communicated with the outside through the negative pole heat dissipation hole.
And the outer edge of the surface of the current collecting disc 8 is provided with an annular insulating pad 7.
Further, as shown in fig. 9, at least two concave sinking grooves 14 are formed in the surface of the collecting tray 8 along the circumferential direction, and the bottom surfaces of the sinking grooves 14 are welding areas; the sinking grooves 14 are of fan-shaped structures, and a raised reinforcing rib 15 is formed between every two adjacent sinking grooves 14.
The central part of the current collecting disc 8 is provided with a positioning hole, the reinforcing ribs 15 are radially distributed by taking the positioning hole as the center, the position of the positioning hole corresponds to the position of the opening at one end of the inner tube 11, and the opening at the positive end of the inner tube 11 is communicated with the outside through the positioning hole and the positive heat dissipation hole in sequence.
The diameter of the positioning hole is larger than the diameter of the inner tube 11.
In the invention, the center of the current collecting disc 8 is provided with a positioning hole, the aperture of the positioning hole is slightly larger than the diameter of the inner tube 11, and the opening of the positive electrode end of the inner tube 11 is communicated with the outside through the positioning hole for heat dissipation. The current collecting disc 8 is provided with a plurality of concave sinking grooves 14 which are circumferentially and uniformly distributed and integrally formed in a stamping mode, the bottom surfaces of the sinking grooves 14 serve as welding areas to be welded and fixed with the positive lugs, reinforcing ribs 15 are formed between the adjacent sinking grooves 14, electrolyte circulation holes are formed in the reinforcing ribs 15, bending portions which are turned downwards are further arranged on the outer edge of the current collecting disc 8, the lower surfaces of the bending portions and the bottom surfaces of the sinking grooves 14 are in the same plane, the bottom surfaces of the sinking grooves 14 and the end faces of the positive lugs of the winding cores 10 after being crumpled are welded through laser pulses, liquid injection holes are formed in the bending portions, the positions of the bending portions correspond to the reinforcing ribs 15, and electrolyte is injected into the shell 1 through the liquid injection holes.
On the basis of ensuring the heat dissipation effect and the temperature balance of the winding core 10, in order to further improve the safety of the battery in the using process, the structure of the inner tube 11 is optimized and improved, the two ends of the inner tube 11 are sealed, a pressure release valve is arranged at one end close to the positive lug, and meanwhile, the inner tube 11 is filled with a phase-change material. When the temperature in the battery is too high, the phase-change material can absorb redundant heat, and heat absorption can be realized while heat dissipation is realized. When lithium ion battery takes place to overcharge, overdischarge, bear high temperature, receive acupuncture or extrusion, battery inside temperature and pressure rise suddenly, the inside heat that produces of battery has surpassed phase change material's heat absorption limit, internal pressure sharply increases, phase change material can be heated and take place to decompose this moment, and produce a large amount of non-combustible gas in the short time, and then break through the relief valve that sets up in inner tube 11 one end, make inner tube 11 and external intercommunication, the gas in the inner tube 11 can discharge, the probability that the battery takes place further detonation has been reduced. In addition, since the battery is a hollow structure, even if the inner tube 11 is communicated with the outside, the internal structure of the battery is not affected, and the battery can still be used normally.
In addition, because the electrolyte can not enter the inner tube 11, the phase-change material is filled in the inner tube 11, so that the phase-change material is prevented from being in direct contact with the electrolyte, and the chemical reaction between the phase-change material and the electrolyte is prevented from affecting the working efficiency of the battery. The phase change material is filled in the inner tube 11, and the internal space of the inner tube 11 is effectively utilized, so that the balance of the internal temperature and the internal pressure of the battery is effectively realized while the volume of the battery is not remarkably increased.
In another embodiment, the present invention provides an assembling method of a battery having a hollow structure, the assembling method including:
firstly, inserting the inner tube assembly 3 into the hollow cavity of the winding core 10; then the materials are put into a shell 1, a positive tab of a winding core 10 is welded with a top cover 2, a negative tab of the winding core 10 is connected with the bottom surface of the shell 1, and the open ends of the two sides of an inner tube component 3 are communicated with the outside; and finally, welding and fixing the top cover 2 and the open end of the shell 1, and injecting electrolyte into the shell 1 to obtain the battery.
Further, the assembling method specifically comprises the following steps:
(1) The positive plate, the diaphragm and the negative plate are stacked and wound to form a winding core 10 with a hollow cavity, and the positive tab at one end of the winding core 10 is bent or kneaded to be flat;
(2) Inserting the inner tube 11 into the hollow cavity of the winding core 10, so that the negative electrode tab is tightly attached to the base 12 and welded and fixed, and a winding core 10 assembly composed of the winding core 10, the inner tube 11 and the base 12 is formed;
(3) The winding core 10 assembly is arranged in a shell 1, the outer edge of an opening at one end of the shell 1 is welded and fixed with the outer edge of a base 12, and the opening end of a negative electrode of an inner tube 11 is communicated with the outside through a negative electrode heat dissipation hole on the base 12;
(4) Welding the positive lug of the winding core 10 with the current collecting disc 8, paving the insulating pad 7 on the outer edge of the surface of the current collecting disc 8, performing mechanical slot rolling on the open end of the shell 1, and injecting electrolyte into the shell 1;
(5) Welding the current collecting disc 8 to the cap 4, wherein the open end of the anode of the inner tube 11 is communicated with the outside through a positioning hole of the current collecting disc 8 and an anode heat dissipation hole on the cap 4;
(6) The top cover 2 is arranged on the rolling groove of the shell 1, and the open end of the positive electrode of the inner tube 11, the top cover 2 and the rolling groove of the shell 1 are fixedly sealed through mechanical extrusion, so that the battery with a hollow structure is formed.
In another embodiment, the present invention provides an electric device including the battery having a hollow structure provided in the above embodiment.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. A winding core is formed by sequentially laminating a positive plate, a diaphragm and a negative plate and then winding the positive plate, the diaphragm and the negative plate, and is characterized in that a hollow cavity formed along the length direction is formed inside the winding core, and an inner pipe assembly is arranged in the hollow cavity;
the positive plate is divided into a positive coating area and a positive empty foil area, the surface of the negative plate is divided into a negative coating area and a negative empty foil area, and the diaphragm covers the positive coating area and the negative coating area; and during winding, the positive electrode empty foil area and the negative electrode empty foil area are respectively positioned at two sides of the winding direction, and the positive electrode lug and the negative electrode lug which are positioned at two ends of the winding core are respectively formed after winding.
2. The winding core according to claim 1, wherein the inner tube assembly comprises an inner tube and a base, the inner tube and the base are arranged along the length direction of the hollow cavity, the base is located at one end of the negative electrode lug of the inner tube, the inner tube is perpendicular to the base, a negative heat dissipation hole is formed in the center of the base, the open end of the negative electrode of the inner tube corresponds to the position of the negative heat dissipation hole, and the open end of the negative electrode of the inner tube is communicated with the outside through the negative heat dissipation hole;
the surface of the base is tightly attached to the end face of the negative electrode lug and is fixedly welded with the negative electrode lug.
3. The winding core according to claim 2, wherein the periphery of one end, close to the positive tab, of the inner tube is wrapped with a first insulating layer;
and the periphery of the positive lug is wrapped with a second insulating layer.
4. A battery having a hollow structure, comprising a case and a top cover at an opening of one end of the case, wherein the winding core having a hollow structure of any one of claims 1 to 3 is placed in the case, and both open ends of the inner tube assembly are in communication with the outside.
5. The battery with a hollow structure as claimed in claim 4, wherein the top cap includes a cap and a cover plate with an annular structure surrounding the outer periphery of the cap, the cap has a positive heat dissipation hole at the center, the positive opening end of the inner tube corresponds to the positive heat dissipation hole, and the positive opening end of the inner tube is communicated with the outside through the positive heat dissipation hole;
a sealing ring is arranged between the cover plate and the cover plate at the outer edge of the cover cap;
the shell is a steel shell.
6. The battery with the hollow structure according to claim 5, wherein a current collecting disc is arranged at one end of the positive tab of the winding core, the positive tab is welded and fixed with the current collecting disc after being bent or flattened, and the current collecting disc is welded and fixed with the cap;
the base of the inner tube assembly is welded and fixed with the opening at one end of the shell, the base of the inner tube assembly is used as the bottom cover of the battery, and the negative electrode opening end of the inner tube is communicated with the outside through the negative electrode heat dissipation hole;
and an annular insulating pad is arranged on the outer edge of the surface of the current collecting disc.
7. The battery with a hollow structure as claimed in claim 6, wherein the surface of the current collecting tray is provided with at least two depressed sunken grooves along the circumferential direction, and the bottom surfaces of the depressed grooves are welding areas; the sinking grooves are of fan-shaped structures, and a raised reinforcing rib is formed between every two adjacent sinking grooves;
a positioning hole is formed in the center of the current collecting disc, the reinforcing ribs are distributed in a radial shape by taking the positioning hole as the center, the position of the positioning hole corresponds to the position of an opening at one end of the inner tube, and an opening at the positive electrode end of the inner tube is communicated with the outside through the positioning hole and the positive heat dissipation hole in sequence;
the aperture of the positioning hole is larger than the diameter of the inner tube.
8. An assembling method of a battery having a hollow structure according to any one of claims 4 to 7, comprising:
firstly, inserting an inner pipe assembly into a hollow cavity of a winding core; then the tube assembly is arranged in a shell, a positive tab of a winding core is welded with a top cover, a negative tab of the winding core is connected with the bottom surface of the shell, and the open ends of the two sides of the inner tube assembly are communicated with the outside; and finally, welding and fixing the top cover and the open end of the shell, and injecting electrolyte into the shell to obtain the battery.
9. The assembly method according to claim 8, characterized in that it comprises in particular the steps of:
(1) The positive plate, the diaphragm and the negative plate are stacked and wound to form a winding core with a hollow cavity, and the positive lug at one end of the winding core is bent or kneaded to be flat;
(2) Inserting the inner tube into the hollow cavity of the winding core, so that the negative electrode lug is tightly attached to the base and welded and fixed to form a winding core assembly consisting of the winding core, the inner tube and the base;
(3) The winding core assembly is arranged in a shell, the outer edge of an opening at one end of the shell is welded and fixed with the outer edge of the base, and the opening end of the negative electrode of the inner tube is communicated with the outside through a negative heat dissipation hole on the base;
(4) Welding the positive lug of the winding core with the current collecting disc, paving an insulating pad on the outer edge of the surface of the current collecting disc, mechanically grooving the open end of the shell, and injecting electrolyte into the shell;
(5) Welding the current collecting disc to the cap, wherein the open end of the anode of the inner tube is communicated with the outside through the positioning hole of the current collecting disc and the anode heat dissipation hole on the cap;
(6) The top cover is arranged in the shell rolling groove, and the open end of the positive electrode of the inner tube, the top cover and the shell rolling groove are fixedly sealed through mechanical extrusion to form the battery with a hollow structure.
10. An electric device characterized by comprising the battery having a hollow structure according to any one of claims 4 to 7.
CN202211132994.3A 2022-09-16 2022-09-16 Roll core, battery with hollow structure, assembly method and electric device Pending CN115295890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211132994.3A CN115295890A (en) 2022-09-16 2022-09-16 Roll core, battery with hollow structure, assembly method and electric device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211132994.3A CN115295890A (en) 2022-09-16 2022-09-16 Roll core, battery with hollow structure, assembly method and electric device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115863891A (en) * 2023-01-05 2023-03-28 湖南德赛电池有限公司 Battery case and battery
CN117855702A (en) * 2024-03-07 2024-04-09 德信东源智能科技(北京)有限公司 Hollow structure lithium battery

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115863891A (en) * 2023-01-05 2023-03-28 湖南德赛电池有限公司 Battery case and battery
CN115863891B (en) * 2023-01-05 2023-08-15 湖南德赛电池有限公司 Battery case and battery
CN117855702A (en) * 2024-03-07 2024-04-09 德信东源智能科技(北京)有限公司 Hollow structure lithium battery
CN117855702B (en) * 2024-03-07 2024-05-07 德信东源智能科技(北京)有限公司 Hollow structure lithium battery

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