CN110970581A - Light lithium battery shell and preparation method thereof - Google Patents
Light lithium battery shell and preparation method thereof Download PDFInfo
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- CN110970581A CN110970581A CN201911338491.XA CN201911338491A CN110970581A CN 110970581 A CN110970581 A CN 110970581A CN 201911338491 A CN201911338491 A CN 201911338491A CN 110970581 A CN110970581 A CN 110970581A
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a light lithium battery shell and a preparation method thereof, wherein the lithium battery shell comprises a shell body with an inner cavity for accommodating a lithium battery winding core, and an opening part of the shell body connected with a top cover is provided with a boss protruding outwards and used for providing welding strength guarantee; and a coating is arranged on the cavity wall of the inner cavity of the shell body. According to the light lithium battery shell and the preparation method thereof, the boss is arranged at the opening part connected with the top cover on the shell body, so that sufficient welding strength between the shell and the top cover can be ensured, the thickness of the shell wall of the shell can be further reduced, the safety strength of the shell is not influenced, the light weight requirement of the shell is met, the weight ratio of the shell in the lithium battery is reduced, the energy density of the lithium battery is further improved, the lithium battery can meet the market demand, and the light lithium battery shell is suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of lithium battery shells, in particular to a light lithium battery shell and a preparation method thereof.
Background
As one of clean energy sources, a lithium ion battery, referred to as a lithium battery for short, has many advantages of high voltage, long charging and discharging life, small environmental pollution, low self-discharging rate, and the like, and is widely applied to various electronic products, such as smart phones, notebook computers, digital cameras, portable small-sized electrical appliances, and the like.
At present, with the increasing demand of people for miniaturization of electronic products, lithium ion batteries are also required to be thinned correspondingly, and the demand for energy density of the lithium batteries is also higher and higher. Through optimizing the material system, positive negative pole material improves and electric core structural design optimizes the scheme such as, constantly promotes battery energy density, and in the aspect of the structure, as the important component of lithium cell, for example reduce the thickness of shell, the shell of lithium cell if can be under the circumstances of guaranteeing shell safe strength, the effectual weight that reduces the shell just can further promote the energy density of lithium cell for can more meet market demand. However, in practical situations, the shell of the lithium battery cannot be reduced continuously after being reduced to a certain degree, otherwise, the welding strength between the top cover and the shell is reduced, and the normal use of the lithium battery is affected.
In view of the above, there is a need to develop a light-weight lithium battery case.
Disclosure of Invention
The invention provides a light lithium battery shell and a preparation method thereof, aiming at solving the defects of the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a light-weight lithium battery case for packaging a lithium battery winding core, where the lithium battery case includes a case body having an inner cavity for accommodating the lithium battery winding core, and an opening portion of the case body, which is connected to a top cover, is provided with a boss protruding outward for ensuring welding strength;
and a coating is arranged on the cavity wall of the inner cavity of the shell body.
Further, in the light-weight lithium battery case, the thickness of the case wall of the case body is smaller than that of the boss;
the shell wall thickness of the shell body is 0.3-0.4 mm, and the thickness of the boss is 0.6-0.8 mm.
Further, among the lightweight lithium battery shell, be provided with a plurality of mortise on the chamber wall of the inner chamber of shell body, be provided with on the outer wall of coating with a plurality of tenon of mortise adaptation.
Further, in the light weight lithium battery case, the coating layer is composed of a mixture of linear low density polyethylene and silica.
Further, in the light weight lithium battery case, the coating layer is composed of a mixture of linear low density polyethylene, silica, and metallic lithium particles.
In a second aspect, an embodiment of the present invention provides a method for preparing a light-weight lithium battery case, where the lithium battery case is the lithium battery case described in the first aspect, and the method includes:
providing a housing body having a boss;
providing a molten coating material;
placing the housing body in a fixture;
pouring the molten coating material into an inner cavity of the housing body;
and pressing a die for assisting the molten coating material to form a coating into an inner cavity of the shell body, and cooling to obtain the lithium battery shell.
Further, in the method for manufacturing a light weight housing for a lithium battery, the step of providing a housing body having a boss includes:
providing an aluminum-manganese alloy material, and screening the material;
and stamping the screened aluminum-manganese alloy material by adopting a die with a boss to obtain the shell body with the boss.
Further, in the method for preparing a lightweight case for a lithium battery, the step of providing a coating material in a molten state includes:
mixing linear low-density polyethylene and silicon dioxide powder according to the mass ratio of 1:1 to obtain a mixture;
mixing and stirring the mixture;
and heating and melting the stirred mixture to obtain the molten coating material.
Further, in the method for preparing a lightweight case for a lithium battery, the step of providing a coating material in a molten state includes:
mixing linear low-density polyethylene and silicon dioxide powder according to the mass ratio of 1:1 to obtain a mixture;
adding a process oil to the mixture;
adding metallic lithium particles to the mixture;
mixing and stirring the mixture;
and heating and melting the stirred mixture to obtain the molten coating material.
Further, in the method for manufacturing the lightweight lithium battery case, after the step of pressing the mold for assisting the molding of the molten state coating material into the inner cavity of the case body, cooling and molding the lightweight lithium battery case, the method further comprises
And extracting the process oil in the coating to form the coating with holes.
According to the light lithium battery shell and the preparation method thereof provided by the embodiment of the invention, the boss is arranged at the opening part connected with the top cover on the shell body, so that the sufficient welding strength between the shell and the top cover can be ensured, the shell wall thickness of the shell can be further reduced, the safety strength of the shell is not influenced, the light weight requirement of the shell is met, the weight ratio of the shell in the lithium battery is reduced, the energy density of the lithium battery is further improved, the lithium battery shell can meet the market demand, and the light lithium battery shell is suitable for large-scale popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a light-weight lithium battery case provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a housing body according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a manufacturing method of a light-weight lithium battery case according to an embodiment of the present invention.
Reference numerals:
the shell comprises a shell body 1, a boss 2, a coating 3, mortise holes 4 and tenons 5.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the 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 invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
Referring to fig. 1 to 2, an embodiment of the invention provides a light-weight lithium battery shell for packaging a lithium battery roll core, the lithium battery shell includes a shell body 1 having an inner cavity for accommodating the lithium battery roll core, an opening portion of the shell body 1 connected to a top cover is provided with a boss 2 protruding outwards for providing welding strength guarantee;
and a coating 3 is arranged on the cavity wall of the inner cavity of the shell body 1.
Wherein the top cover is used for closing the inner cavity of the shell body 1.
The shell body 1 is mainly made of aluminum-manganese alloy with the trade mark of AL3003-H14 and mainly comprises Si, Fe, Cu, Mn, Zn, Al and the like.
In order to ensure that the top cover and the housing body 1 have sufficient welding strength after the housing body 1 is thinned, the embodiment designs the boss 2 at the opening part of the housing body 1 connected with the top cover.
Preferably, the thickness of the shell wall of the shell body 1 is smaller than that of the boss 2;
the shell wall thickness of the shell body 1 is 0.3-0.4 mm, and is thin enough, the thickness of the boss 2 is 0.6-0.8 mm, and the height of the boss 2 is 5-10 mm.
In order to fix the connection between the coating 3 and the shell body 1, a plurality of mortises 4 are formed in the cavity wall of the inner cavity of the shell body 1, and a plurality of tenons 5 matched with the mortises 4 are formed in the outer wall of the coating 3.
In this embodiment, the coating 3 has two types, the first type is composed of a mixture of linear low density polyethylene and silica, and the second type is composed of a mixture of linear low density polyethylene, silica and metallic lithium particles.
The linear low density polyethylene has the advantages of high strength, good toughness, high rigidity, good heat resistance, good cold resistance and the like, has good environmental stress crack resistance, impact strength, tear strength and the like, and can resist acid, alkali, organic solvents and the like.
Because lithium ion battery is in the use, especially under the very high condition of service life, probably take place lithium cell and roll up the rupture of core outer lane barrier film, lead to the condition of positive pole piece direct contact to lithium cell housing, in addition lithium cell is in order to prevent that the aluminum hull from corroding, generally will switch on housing and positive pole, will lead to the battery to take place the short circuit when so positive pole contacts the housing. The first coating 3 is added between the shell and the lithium battery winding core, so that the occurrence of internal short circuit in the case can be effectively avoided.
In addition, the capacity attenuation of the lithium ion battery mainly comes from the consumption of a lithium source, if a certain amount of metal lithium, namely the second coating 3, is added in the manufacturing process of the lithium ion battery, the second coating is continuously released in the using process to play a role in lithium supplement, the purposes of slowing down the capacity attenuation and improving the cycle performance of the battery can be achieved, meanwhile, the capacity exertion of the battery can be improved, namely, the energy density is improved, and the occurrence of internal short circuit can be avoided.
According to the light lithium battery shell provided by the embodiment of the invention, the boss is arranged at the opening part connected with the top cover on the shell body, so that the sufficient welding strength between the shell and the top cover can be ensured, the shell wall thickness of the shell can be further reduced, the safety strength of the shell is not influenced, the light weight requirement of the shell is met, the weight ratio of the shell in the lithium battery is reduced, the energy density of the lithium battery is further improved, the market demand can be met, and the light lithium battery shell is suitable for large-scale popularization and application.
Example two
Referring to fig. 2, a flow chart of a manufacturing method of a lightweight lithium battery case provided in an embodiment of the present invention is schematically shown, where the lithium battery case is the lithium battery case in the first embodiment. The method specifically comprises the following steps:
s201, providing a shell body with a boss.
Specifically, the step S201 further includes:
providing an aluminum-manganese alloy material, and screening the material;
and (3) stamping the screened aluminum-manganese alloy material by adopting a die with a boss (stamping and forming for N times, wherein the times are determined by specific models), so as to obtain the shell body with the boss.
Preferably, after the housing body with the boss is obtained, the process steps of deburring, polishing, cleaning and the like are required.
S202, providing the molten coating material.
It should be noted that there are two kinds of coatings in this embodiment, which correspond to different use requirements, and there are two kinds of corresponding molten coating materials, and the preparation process is divided into the following two cases:
in the first case, specifically, the step S202 further includes:
mixing linear low-density polyethylene and silicon dioxide powder according to the mass ratio of 1:1 to obtain a mixture, wherein the volume ratio of the silicon dioxide powder is 30-80%;
mixing and stirring the mixture for 30-60 min;
and heating and melting the stirred mixture at the heating temperature of 150-180 ℃ to obtain the molten coating material.
In the second case, specifically, the step S202 further includes:
mixing linear low-density polyethylene and silicon dioxide powder according to the mass ratio of 1:1 to obtain a mixture, wherein the volume ratio of the silicon dioxide powder is 30-80%;
adding process oil (special for a polyethylene partition) into the mixture, wherein the mass of the process oil accounts for 60-70% of the total mass;
adding metallic lithium particles to the mixture;
mixing and stirring the mixture for 30-60 min;
and heating and melting the stirred mixture at the heating temperature of 150-180 ℃ to obtain the molten coating material.
S203, placing the shell body in a clamp.
S204, pouring the molten coating material into an inner cavity of the shell body.
S205, pressing a die for assisting the molten state coating material to form the coating into an inner cavity of the shell body, and cooling to obtain the lithium battery shell.
In correspondence with the first case described above, it is preferable that after the step S205, the method further includes
And extracting the process oil in the coating to form the coating with holes.
Preferably, after the lithium battery shell is obtained, the process steps of demolding, trimming, cleaning and the like are required.
According to the preparation method of the light lithium battery shell provided by the embodiment of the invention, the boss is arranged at the opening part connected with the top cover on the shell body, so that the sufficient welding strength between the shell and the top cover can be ensured, the shell wall thickness of the shell can be further reduced, the safety strength of the shell is not influenced, the light weight requirement of the shell is met, the weight ratio of the shell in the lithium battery is reduced, the energy density of the lithium battery is further improved, the market demand can be met, and the preparation method is suitable for large-scale popularization and application.
The foregoing description of the embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same elements or features may also vary in many respects. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being "on" … … "," engaged with "… …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted.
Claims (10)
1. A light lithium battery shell is used for packaging a lithium battery winding core and is characterized by comprising a shell body, a welding head and a welding head, wherein the shell body is provided with an inner cavity for accommodating the lithium battery winding core;
and a coating is arranged on the cavity wall of the inner cavity of the shell body.
2. The light-weight lithium battery case of claim 1, wherein a wall thickness of the case body is smaller than a thickness of the boss;
the shell wall thickness of the shell body is 0.3-0.4 mm, and the thickness of the boss is 0.6-0.8 mm.
3. The light-weight lithium battery shell as claimed in claim 1, wherein a plurality of mortises are formed in the wall of the inner cavity of the shell body, and a plurality of tenons adapted to the plurality of mortises are formed in the outer wall of the coating layer.
4. The light weight lithium battery case of claim 1, wherein the coating is comprised of a mixture of linear low density polyethylene and silica.
5. The light weight lithium battery case of claim 1, wherein the coating is comprised of a mixture of linear low density polyethylene, silica, and metallic lithium particles.
6. A method for manufacturing a lithium battery case with reduced weight, the lithium battery case being the lithium battery case according to any one of claims 1 to 5, the method comprising:
providing a housing body having a boss;
providing a molten coating material;
placing the housing body in a fixture;
pouring the molten coating material into an inner cavity of the housing body;
and pressing a die for assisting the molten coating material to form a coating into an inner cavity of the shell body, and cooling to obtain the lithium battery shell.
7. The method of manufacturing a lithium battery lightweight case according to claim 6, wherein the step of providing a case body having a boss includes:
providing an aluminum-manganese alloy material, and screening the material;
and stamping the screened aluminum-manganese alloy material by adopting a die with a boss to obtain the shell body with the boss.
8. The method for preparing a lightweight housing for a lithium battery as claimed in claim 6, wherein the step of providing the coating material in a molten state comprises:
mixing linear low-density polyethylene and silicon dioxide powder according to the mass ratio of 1:1 to obtain a mixture;
mixing and stirring the mixture;
and heating and melting the stirred mixture to obtain the molten coating material.
9. The method for preparing a lightweight housing for a lithium battery as claimed in claim 6, wherein the step of providing the coating material in a molten state comprises:
mixing linear low-density polyethylene and silicon dioxide powder according to the mass ratio of 1:1 to obtain a mixture;
adding a process oil to the mixture;
adding metallic lithium particles to the mixture;
mixing and stirring the mixture;
and heating and melting the stirred mixture to obtain the molten coating material.
10. The method for preparing a lithium battery lightweight shell according to claim 9, further comprising the step of pressing a mold for assisting the molding of the molten coating material into the inner cavity of the shell body, cooling the mold, and molding the lithium battery shell
And extracting the process oil in the coating to form the coating with holes.
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| CN209029426U (en) * | 2018-11-02 | 2019-06-25 | 江苏塔菲尔新能源科技股份有限公司 | A kind of battery case and the lithium ion battery using the shell |
| CN209804718U (en) * | 2019-04-04 | 2019-12-17 | 河北化工医药职业技术学院 | Lithium battery shell |
| CN110379947A (en) * | 2019-07-24 | 2019-10-25 | 江苏塔菲尔新能源科技股份有限公司 | A kind of battery case and preparation method thereof and lithium ion battery and its mend lithium method |
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