CN114792868A - Cylindrical battery, preparation method thereof and battery pack - Google Patents
Cylindrical battery, preparation method thereof and battery pack Download PDFInfo
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- CN114792868A CN114792868A CN202210415344.3A CN202210415344A CN114792868A CN 114792868 A CN114792868 A CN 114792868A CN 202210415344 A CN202210415344 A CN 202210415344A CN 114792868 A CN114792868 A CN 114792868A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 39
- 238000003466 welding Methods 0.000 claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 description 11
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002322 conducting polymer Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
Classifications
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
- H01M10/05—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
- 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
- H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- 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
Abstract
The invention provides a cylindrical battery, a preparation method thereof and a battery pack, wherein the cylindrical battery comprises an electrode assembly and a battery pack, wherein the electrode assembly comprises a winding core and electrode lugs, and the electrode lugs comprise a first electrode lug and a second electrode lug which are formed by respectively extending along two ends of the winding core and have opposite polarities; at least one part of the drainage piece is arranged in an accommodating space formed by the inner diameter of the winding core along the lug outlet direction; the shell assembly is used for containing the electrode assembly and the drainage piece and comprises a shell and an electrode terminal which is arranged at one end of the shell and is close to the first pole lug, and the shell and the electrode terminal are arranged in an insulating way; the first pole lug is electrically connected with the shell at the end where the electrode terminal is located, the second pole lug is electrically connected with the electrode terminal through the drainage piece, and the second pole lug and the shell are arranged in an insulating mode. Compared with the prior art, the novel current path is opened up through the setting of drainage piece to this cylinder battery, has solved present cylinder battery because of both ends go out utmost point ear lead to with the loaded down with trivial details problem of busbar welding.
Description
Technical Field
The invention relates to the field of secondary batteries, in particular to a cylindrical battery, a preparation method thereof and a battery pack.
Background
With the development of the times, people use lithium ion batteries more and more frequently, and the requirements are higher and higher. Particularly, the development of new energy automobiles is more rapid in recent years, and the requirements of high energy density and high safety performance are further put forward for lithium batteries. In present cylinder lithium cell, positive negative pole ear sets up respectively in the both ends of cylinder electricity core to draw forth from both ends, nevertheless design and the welding of later stage module busbar are not favorable to this kind of structure that both ends go out utmost point ear, have increased the loaded down with trivial details and the degree of difficulty of preparation, have restricted the equipment of cylinder battery greatly and have used.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One of the objects of the present invention is: the cylindrical battery is provided to solve the problem that the welding between the cylindrical battery and a bus bar is complicated due to the fact that tabs are formed at two ends of the conventional cylindrical battery, welding procedures are reduced through the design that a positive tab and a negative tab are formed at one end, and the design of the bus bar is simplified.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cylindrical battery comprising:
the electrode assembly comprises a winding core and tabs, wherein the tabs comprise a first tab and a second tab which are formed by respectively extending along two ends of the winding core and have opposite polarities;
at least one part of the drainage piece is arranged in an accommodating space formed by the inner diameter of the winding core along the pole lug outlet direction;
the shell assembly is used for containing the electrode assembly and the drainage piece and comprises a shell and an electrode terminal which is arranged at one end of the shell and is close to the first tab, and the shell and the electrode terminal are arranged in an insulating way;
the first lug is electrically connected with the shell at the end where the electrode terminal is located, the second lug is electrically connected with the electrode terminal through the drainage piece, and the second lug and the shell are arranged in an insulating mode.
Preferably, the drainage member includes a first portion disposed in the receiving space and a second portion extending in a thickness direction of at least one end of the first portion; the first portion is electrically connected to the electrode terminal; the second portion is electrically connected to the second pole ear.
Preferably, the first portion and the second portion are each independently made of at least one metal of aluminum, copper, and nickel.
Preferably, the first portion and the second portion are formed in a cross-sectional view in a tab-outlet direction
At least one of (a).
Preferably, the second portion and the first portion are integrally formed, the end portion of the first portion is cut into two parts along the tab outlet direction and then bent reversely along the thickness direction of the first portion to form the second portion, and at least one part of the second portion covers the surface of the second tab and is welded with the second tab.
Preferably, the first portion is provided with a plurality of through holes.
Preferably, the outer surface of the first portion is further covered with an insulating polymer layer.
Preferably, the housing comprises a wall and a cover plate for sealing an opening in the wall at the end of the second pole ear.
Preferably, an insulating layer is arranged on one side, close to the second tab, of the cover plate.
Preferably, the cylindrical battery further comprises a current collecting disc arranged between the first pole lug and the shell, the first pole lug passes through the current collecting disc and is electrically connected with the shell, and the current collecting disc and the drainage piece are arranged in an insulating mode.
Preferably, the first tab is a positive tab, the second tab is a negative tab, and the shell is an aluminum shell; or the first pole lug is a negative pole lug, the second pole lug is a positive pole lug, and the shell is a steel shell.
Another object of the present invention is to provide a method for manufacturing the cylindrical battery, comprising the steps of:
s1, placing the electrode assembly in the shell assembly, and welding a first tab on the electrode assembly with a shell at one end where the electrode terminal is located;
s2, extending the drainage piece into an accommodating space formed by the inner diameter of the winding core along the tab outlet direction, welding one end of the drainage piece with the electrode terminal, and welding the other end of the drainage piece with the second tab;
and S3, sealing the end part where the second tab is located, and keeping the second tab and the shell in an insulation mode to finish the preparation of the cylindrical battery.
The invention also aims to provide a battery pack which comprises any one of the cylindrical batteries.
Compared with the prior art, the invention has the beneficial effects that: according to the cylindrical battery provided by the invention, a new current path is opened up through the arrangement of the drainage piece, and the electrical property of the second pole lug can be led out from one end where the first pole lug is located after the current path is electrically connected with the second pole lug, so that the cylindrical battery with one end provided with the pole lug is formed, the problem that the conventional cylindrical battery is fussy to weld with a bus bar due to the fact that the pole lugs are led out from two ends is solved, the welding process is reduced, and the design of the bus bar is simplified.
Drawings
Fig. 1 is a schematic view of a cylindrical battery according to the present invention.
Fig. 2 is a second schematic structural diagram of the cylindrical battery of the present invention.
Fig. 3 is a schematic structural view of the drainage member of the present invention.
Fig. 4 is a second schematic structural view of the drainage member of the present invention.
Fig. 5 is a third schematic view of the drainage member of the present invention.
In the figure: 11-a winding core; 12-a first tab; 13-a second tab; 2-a drainage member; 21-a first section; 22-a second portion; 3-a shell; 31-a shell wall; 32-a cover plate; 4-an electrode terminal; 5-an insulating layer; 6-collecting plate.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to specific embodiments and drawings of the specification, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but 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 therefore, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" 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" or "second" 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 specifically defined otherwise.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "secured" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
The invention aims to provide a battery pack which is formed by combining a plurality of single batteries.
As shown in fig. 1, the single battery is a cylindrical battery, and includes an electrode assembly, a current guiding member 2, and a housing assembly.
The electrode assembly is contained in the shell assembly and comprises a winding core 11 and electrode lugs, wherein the electrode lugs comprise a first electrode lug 12 and a second electrode lug 13 which are formed by respectively extending two ends of the winding core 11 and have opposite polarities. The tabs can be full tabs, and are arranged at two ends of the cell main body after being kneaded flat, wherein one end of the tabs is a first tab 12, and the other end of the tabs is a second tab 13. The electrode lugs can also be multi-electrode lugs, and the electrode lugs of the same polarity are electrically connected with each other and flattened to form a first electrode lug 12 and a second electrode lug 13 respectively. Wherein the electrical connection may be a weld, including ultrasonic, laser, or resistance welding.
The winding core 11 includes a positive electrode plate, a negative electrode plate, and a diaphragm spaced between the positive electrode plate and the negative electrode plate, and is formed by winding, and the winding can be cylindrical or polygonal. The positive pole piece is provided with a positive pole lug, and the positive pole lug can be made of aluminum foil; and the negative pole tab led out from the negative pole piece can be made of copper foil or nickel-to-copper. Specifically, the first tab 12 may be a positive tab or a negative tab, and the second tab 13 may be a negative tab or a positive tab.
And a housing assembly for housing the electrode assembly, which includes a case 3 and an electrode terminal 4 disposed at one end of the case 3 and adjacent to the first tab 12, the case 3 being disposed in an insulated manner from the electrode terminal 4. The electrode assembly is accommodated in the housing assembly and is electrically connected with the first tab 12 and the second tab 13 through the housing 3 and the electrode terminal 4 of the housing assembly, respectively, so that the positive and negative electrodes of the battery are led out.
Specifically, the electrode terminal 4 may be a negative electrode post, or a positive electrode post, and when the electrode terminal is a negative electrode post, the electrode terminal is electrically connected to a negative electrode tab, and the housing 3 serves as a positive electrode terminal to lead out electrical property; when it is a positive electrode terminal, it is electrically connected to the positive electrode tab, and the housing 3 is electrically led out as a negative electrode terminal. The electrical connection may be a weld, including ultrasonic, laser, or resistance. The electrode terminal 4 and the case 3 may be insulated by providing an insulating gasket at the interface therebetween. The shape of the insulating seal ring can be adjusted in accordance with the shapes of the housing 3 and the electrode terminal 4.
And the shape of the shell 3 may be cylindrical, and the shapes of the two may be adapted to be assembled when the shape of the winding core 11 corresponds to the cylindrical shape. And when the shape of rolling up core 11 was the polygon, casing 3 also can still set up to be cylindrical, can produce the gas inflation after rolling up core 11 and discharging this moment, and still have the headspace between rolling up core 11 and the casing 3, can allow electrode assembly to take place the inflation on the one hand, and on the other hand can also play the effect of avoiding electrode assembly's periphery to receive casing 3 extrusion.
In addition, the cylindrical battery also comprises a drainage piece 2, and at least one part of the drainage piece 2 is arranged in an accommodating space formed by the inner diameter of the winding core 11 along the pole lug outlet direction; the electrode terminal 4 is located one end, first utmost point ear 12 with this end the casing 3 electricity is connected, second utmost point ear 13 passes through drainage piece 2 with the electrode terminal 4 electricity is connected, just second utmost point ear 13 with the insulating setting of casing 3. The tab outlet direction is the Z direction in fig. 1.
The setting through drainage piece 2 makes its utmost point ear electricity be connected with one end to draw the other end with the electrical property of this end, realized from this that with end play utmost point ear, solved present cylindrical battery because of both ends play utmost point ear lead to with the loaded down with trivial details problem of busbar welding.
In addition, the invention also cancels the welding of the anode tab and the connecting sheet or the welding of the cathode tab and the connecting sheet by introducing the drainage piece 2, and then reduces the welding position/welding times by the welding process of the connecting sheet and the end plate, thereby reducing the influence of welding slag on the product performance. In addition, this drainage piece 2 can also play the effect of rolling up 11 internal support of core, optimizes the project organization of electric core.
When the second tab 13 is an anode tab, the drainage member 2 is connected with the second tab to lead out the anode end and electrically connect the anode end with the electrode terminal 4, the corresponding electrode terminal 4 is an anode pole, the first tab 12 is a cathode tab, the shell 3 is a cathode end, and the shell 3 can be made of steel. And when the second tab 13 is a negative electrode tab, the drainage piece 2 is connected with the negative electrode tab to lead out the negative electrode end to be electrically connected with the electrode terminal 4, the corresponding electrode terminal 4 is a negative electrode pole, the first tab 12 is a positive electrode tab, the shell 3 is a positive electrode end, and the shell 3 can be prepared from aluminum materials. The electrical connection may be a weld, a thread or a rivet, including an ultrasonic weld, a laser weld or an electric resistance weld.
In some embodiments, the drainage member 2 includes a first portion 21 disposed in the receiving space and a second portion 22 formed to extend in a thickness direction of at least one end portion of the first portion 21; the first portion 21 is electrically connected to the electrode terminal 4; the second portion 22 is electrically connected to the second tab 13, wherein the thickness direction of the first portion is the X direction in fig. 1. Through the structural arrangement of the first part 21 and the second part 22, the second electrode lug 13 is electrically connected with the electrode terminal 4 well, and the positive electrode lug and the negative electrode lug are effectively led out from the same end. Preferably, the first part 21 can be arranged at the winding center of the winding core 11, so that on one hand, the effect of leading out current at one end is achieved, the arrangement that lugs at two ends need to be welded by means of connecting sheets is eliminated, the number of times of welding marks is reduced, and further, the influence of welding slag on the performance of products is reduced; on the other hand, the electrode assembly can also play a role of a bracket inside the winding core 11, and the design structure of the electrode assembly is optimized.
In some embodiments, the first portion 21 and the second portion 22 are formed in a cross-sectional view in the tab outlet direction
At least one of them can be shown in fig. 3 to 5. Wherein the vertical rod is a first part 21 arranged in the winding core 11 along the pole ear outlet directionThe projection of the receiving space formed by the diameter on the bottom of the housing 3 may be circular, polygonal or elliptical, and the like, and preferably penetrates through the receiving space along the tab extending direction, so as to better electrically connect with the electrode terminal 4 and extend the second portion 22. The cross bar is referred to as a second portion 22, the second portion 22 can be obtained by bending, folding, bending or splitting the middle portion of the first portion 21 into two parts, and at least one part of the second portion is disposed on the surface of the second tab 13 to facilitate welding with the second tab 13, preferably laser welding. The second portion 22 may be connected to the first portion 21 by welding, and after welding, at least a part of the same second portion 22 is disposed on the surface of the second tab 13 to facilitate welding with the second tab 13, preferably by laser welding.
Preferably, the first portion 21 and the second portion 22 are formed in a cross-sectional view in a tab extending direction
As shown in fig. 4-5, at this time, the contact area between the second portion 22 and the second tab 13 is larger, the welding surface between the second portion and the second tab is also larger, the electrical connection performance is better, the overcurrent capability is also stronger, and the power battery can meet the requirement of high overcurrent capability of the power battery. More preferably, the second portion 22 and the first portion 21 are integrally formed, an end of the first portion 21 is cut into two parts along the tab-outlet direction and then bent in the opposite direction along the thickness direction (X direction) of the first portion 21 to form the second portion 22, and cross-sectional views of the first portion 21 and the second portion 22 formed in the tab-outlet direction are the same
At least a portion of the second portion 22 covers the surface of the second tab 13 and is welded to the second tab 13. Specifically, the length of the second portion 22 in the X direction after being bent is designed in advance, then the length of the first portion 21 is added according to the length, and then the first portion 21 is cut to the length from the middle position of the end of the first portion 21 along the tab-extending direction to obtain two separated portions, and the two portions are bent in the opposite direction along the thickness direction (X direction) of the first portion 21 to obtain the second portion 22.
In some embodiments, the first portion 21 may be made of at least one metal of aluminum, copper, and nickel, and in particular, when the drainage member 2 is used for leading out the positive terminal, the first portion 21 may be made of aluminum or aluminum alloy; when the current lead 2 is used to lead out the negative terminal, the first portion 21 may be made of copper, nickel, a copper alloy, or a nickel alloy. In some embodiments, the first portion 21 may be a solid structure, which has better supporting force and better flow passing capacity. In other embodiments, the first portion 21 may also be a hollow structure, and the hollow structure specifically includes at least one through hole, so that when the electrolyte soaks the winding core 11, the through hole can store excess electrolyte, and after a part of electrolyte is consumed in a subsequent cycle, the electrolyte stored in the through hole can be timely replenished, thereby ensuring the cycle performance of the battery. The hollow structure of the preferred first portion 21 is composed of a plurality of through holes, and the specific through holes may be vertically arranged in the first portion 21 along the Z direction, or transversely arranged in the first portion 21 along the X direction, or arranged in the first portion 21 along other directions, or arranged in the first portion 21 in a honeycomb shape. Further preferably, the through hole extends from the side wall of the first portion 21 to the inside of the first portion, or the whole first portion 21 is designed to be porous like a sponge structure, so that on one hand, the electrolyte is more favorably soaked, and the electrolyte is stored in the battery in advance; on the other hand, the weight of the battery can be reduced, and the portable type is better.
In some embodiments, the outer surface of the first portion 21 is also covered with an insulating polymer layer. The polymer in this insulating polymer layer can be for absorbing the polymer of electrolyte, has avoided the situation of first portion 21 with the contact short circuit of rolling up core 11 inner wall on the one hand, and on the other hand also can play the purpose of saving electrolyte in advance, treats after the multicycle charge-discharge, when electrolyte is consumed and reduces, can in time release the electrolyte of saving in advance, and then effectively promote the cyclicity ability of battery. In addition, the polymer in the insulating polymer layer can also be a heat-conducting polymer, so that the situation of short circuit caused by contact between the first part 21 and the inner wall of the winding core 11 is avoided, and the heat of the battery can be conducted out of the battery when the battery generates heat, thereby ensuring the use safety of the battery. The above-mentioned polymers are those which are disclosed in the prior art and have the above-mentioned functions, and are not described herein again.
In some embodiments, the second portion 22 is made of at least one metal of aluminum, copper, and nickel. Specifically, when the drainage member 2 is used to lead out the positive terminal, the second portion 22 may be made of aluminum or aluminum alloy; when the current lead 2 is used to lead out the negative terminal, the second portion 22 may be made of copper, nickel, a copper alloy, or a nickel alloy. The second portion 22 is preferably made of a flexible metal material so as to be bent, folded, etc. over the surface of the second tab 13. The second portion 22 may be provided with a length of 30-95% of the diameter of the winding core 11. Specifically, the concentration of the surfactant is 30-50%, 50-60%, 60-70%, 70-80% or 80-95%. The overlapping area of the second portion 22 and the second tab 13 can be 50-99% of the area of the second portion 22.
In some embodiments, the housing 3 includes a wall 31 and a cover plate 32, and the cover plate 32 is used for sealing an opening of the wall 31 at the end of the second pole ear 13, and may be welded to the wall 31 for sealing. In addition, the cover plate 32 penetrates through at least one liquid injection hole along the pole lug outlet direction, and liquid injection is carried out through the liquid injection hole, namely the liquid injection is carried out from the bottom of the inverted cylindrical battery, so that the situation that the electrolyte is gathered at the second part 22 of the drainage piece 2 at the bottom when injected and cannot fully infiltrate the winding core 11 can be avoided.
Preferably, an insulating layer 5 is disposed on one side of the cover plate 32 close to the second tab 13. The insulating layer 5 is arranged to avoid the problem that the second part 22 of the drainage member 2 is contacted with the cover plate 32 to cause short circuit, thereby further ensuring the use safety of the battery. Correspondingly, the liquid injection hole is communicated with the insulating layer 5, and the liquid injection hole is sealed through the rubber plug after liquid injection, so that the sealing performance of the battery is ensured.
In some embodiments, as shown in fig. 2, the cylindrical battery further includes a current collecting disk 6 disposed between the first tab 12 and the casing 3, the first tab 12 is electrically connected to the casing 3 through the current collecting disk 6, and the current collecting disk 6 is disposed in an insulating manner from the current guiding member 2. The current collecting plate 6 is used for guiding the first tab 12 to be electrically connected with the shell 3 more tightly, so that the electrons move more smoothly, and the internal resistance is reduced. Specifically, the current collecting plate 6 is provided with a through hole corresponding to the first portion 21, the first portion 21 passes through the through hole to be electrically connected with the electrode terminal 4, and an insulating assembly is arranged on the wall of the through hole to prevent the current collecting plate 6 from contacting and short-circuiting the first portion 21. At least one part of the current collecting disc 6 is covered on the surface of the first tab 12, and the length of the current collecting disc 6 can be 30-95% of the diameter of the winding core 11. Specifically, the content of the organic solvent is 30 to 50%, 50 to 60%, 60 to 70%, 70 to 80%, or 80 to 95%. The overlapping area of the first portion 21 and the first tab 12 may be 50 to 90% of the flattened area of the first tab 12.
Specifically, one of the specific embodiments of the cylindrical battery of the present invention is:
a cylindrical battery comprises an electrode assembly, a drainage member 2 and a shell assembly; the electrode assembly comprises a winding core 11 and tabs, the tabs comprise a positive tab and a negative tab which are respectively formed by extending along two ends of the winding core 11, and the inner diameter of the winding core 11 forms an accommodating space; the current guide member 2 comprises a first part 21 arranged in the accommodating space and a second part 22 formed by extending along the thickness direction of one end part of the first part 21, the second part 22 is covered on the surface of the negative pole lug and welded with the surface of the negative pole lug, the outer surface of the first part 21 is covered with an insulating polymer layer, and the second part 22 and the first part 21 are integrally formed; the shell assembly is used for containing the electrode assembly and the drainage piece 2 and comprises an aluminum shell 3 and an electrode terminal 4 (namely a negative pole column) which is arranged at one end of the aluminum shell 3 and close to a positive pole lug, wherein the electrode terminal 4 is electrically connected with one end of the first part 21 far away from the second part 22 so as to lead out negative electricity from the electrode terminal 4, the aluminum shell 3 which is positioned at the same end with the electrode terminal 4 is welded with the positive pole lug and is led out as a positive pole end, and the aluminum shell 3 and the electrode terminal 4 are arranged in an insulating way, so that the positive pole and the negative pole are led out from the same end of the cylindrical battery. In addition, this aluminum shell 3 still includes conchal wall 31 and apron 32, and apron 32 is used for sealing the conchal wall 31's of the tip that the negative pole utmost point ear is located opening, and the apron 32 is close to the one side of negative pole utmost point ear and is provided with insulating layer 5 to guarantee the insulating nature of positive negative pole.
The preparation method of the cylindrical battery with the pole as the cathode and the aluminum shell 3 as the anode comprises the following steps:
step 1: the aluminum shell 3, the drainage piece 2 and the cathode column are processed according to the required size for production, wherein the aluminum shell 3, the drainage piece 2 and the cathode column are subjected to sealing and insulating treatment;
step 2: preparing a cylindrical roll core 11, flattening a positive electrode tab and a negative electrode tab of the cylindrical roll core, directly inserting a positive electrode from the bottom into the top to be in contact with the top of the aluminum shell, and performing spot bottom welding on the positive electrode tab and the aluminum shell to obtain an aluminum shell body 3 serving as a positive electrode;
and step 3: cutting one end of the drainage piece 2 from the middle part and bending to form a second part 22 and welding with the direct point bottom of a negative pole lug, wherein one end of the first part 21, which is far away from the second part 22, is welded with a negative pole column, and the negative pole column is used as a negative pole; the drainage piece 2 can be used as a support piece to participate in winding when the winding core 11 is produced, or the drainage piece 2 can be inserted into the accommodating space after the step 2 is completed, and then the drainage piece is cut to form the second part 22;
and 4, step 4: and sealing the opening of the shell wall 31 by using a cover plate 32, wherein an insulating layer 5 is arranged on one side of the cover plate 32 close to the second tab 13, the insulating layer 5 can be an additional insulating baffle or the insulating layer 5 coated on the surface of the cover plate 32, and after the insulating treatment of the cover plate 32 and the negative pole is carried out, the cover plate 32 and the aluminum shell are welded in a laser sealing manner to finish the preparation of the cylindrical battery.
The second embodiment of the cylindrical battery of the present invention is:
a cylindrical battery comprises an electrode assembly, a drainage member 2 and a shell assembly; the electrode assembly comprises a winding core 11 and tabs, the tabs comprise a positive tab and a negative tab which are respectively formed by extending along two ends of the winding core 11, and the inner diameter of the winding core 11 forms an accommodating space; the drainage piece 2 comprises a first part 21 arranged in the accommodating space and a second part 22 formed by extending along the thickness direction of one end part of the first part 21, the second part 22 covers the surface of the positive pole lug and is welded with the surface of the positive pole lug, the outer surface of the first part 21 is covered with an insulating polymer layer, and the second part 22 and the first part 21 are integrally formed; the shell assembly is used for containing the electrode assembly and the drainage piece 2 and comprises a steel shell 3 and an electrode terminal 4 (namely a positive pole) which is arranged at one end of the steel shell 3 and close to a negative pole lug, wherein the electrode terminal 4 is electrically connected with one end of the first part 21 far away from the second part 22 so as to lead out positive electrical property from the electrode terminal 4, the steel shell 3 which is positioned at the same end with the electrode terminal 4 is welded with the negative pole lug and is led out as a negative pole end, and the steel shell 3 and the electrode terminal 4 are arranged in an insulating way, so that the positive pole and the negative pole are led out from the same end of the cylindrical battery. In addition, the steel shell housing 3 further comprises a housing wall 31 and a cover plate 32, the cover plate 32 is used for sealing an opening of the housing wall 31 at the end part where the positive electrode tab is located, and an insulating layer 5 is arranged on one side of the cover plate 32 close to the positive electrode tab to ensure the insulation of the positive electrode and the negative electrode.
The preparation method of the cylindrical battery with the pole as the anode and the steel shell 3 as the cathode comprises the following steps:
step 1: the steel shell 3, the drainage piece 2 and the positive pole are processed according to the required size for production, wherein the steel shell 3, the drainage piece 2 and the positive pole are subjected to sealing and insulating treatment;
step 2: preparing a cylindrical winding core 11, flattening a positive electrode tab and a negative electrode tab of the cylindrical winding core, then directly inserting a negative electrode from the bottom into the top to be contacted with the top of the steel shell, and performing spot bottom welding on the negative electrode tab and the steel shell, wherein the steel shell 3 is used as a negative electrode;
and step 3: cutting one end of the drainage piece 2 from the middle part and bending to form a second part 22 and directly welding the second part 22 with the anode tab at the bottom, welding one end of the first part 21 far away from the second part 22 with the anode column, and using the anode column as the anode; the drainage piece 2 can be used as a support piece to participate in winding when the winding core 11 is produced, or the drainage piece 2 can be inserted into the accommodating space after the step 2 is completed, and then the drainage piece is cut to form the second part 22;
and 4, step 4: the opening of the shell wall 31 is sealed by adopting a cover plate 32, wherein an insulating layer 5 is arranged on one side of the cover plate 32 close to the positive pole lug, the insulating layer 5 can be an additional insulating baffle plate, or the insulating layer 5 is coated on the surface of the cover plate 32, and after the cover plate 32 and the positive pole are subjected to insulating treatment, the cover plate 32 and the steel shell are subjected to laser sealing welding to finish the preparation of the cylindrical battery.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art to which the invention pertains based upon the disclosure and teachings of the above specification. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (13)
1. A cylindrical battery, comprising:
the electrode assembly comprises a winding core and tabs, wherein the tabs comprise a first tab and a second tab which are formed by respectively extending along two ends of the winding core and have opposite polarities;
at least one part of the drainage piece is arranged in an accommodating space formed by the inner diameter of the winding core along the pole lug outlet direction;
the shell assembly is used for containing the electrode assembly and the drainage piece and comprises a shell and an electrode terminal which is arranged at one end of the shell and is close to the first tab, and the shell and the electrode terminal are arranged in an insulating way;
the electrode terminal comprises a shell, a drainage piece, a first lug, a second lug, a first electrode and a second electrode, wherein the first lug is electrically connected with the shell at one end where the electrode terminal is located, the second lug is electrically connected with the electrode terminal through the drainage piece, and the second lug is arranged in an insulating mode with the shell.
2. The cylindrical battery according to claim 1, wherein the drain member includes a first portion provided in the housing space and a second portion formed to extend in a thickness direction of at least one end portion of the first portion; the first portion is electrically connected to the electrode terminal; the second portion is electrically connected to the second pole ear.
3. The cylindrical battery according to claim 2, wherein the first portion and the second portion are each independently made of at least one metal of aluminum, copper, and nickel.
4. The cylindrical battery as claimed in claim 2, wherein the first portion and the second portion form a cross-sectional view in the tab-exiting direction that is at least one of "+", "+".
5. The cylindrical battery according to claim 4, wherein the second portion is integrally formed with the first portion, the end of the first portion is cut into two parts along the tab-protruding direction and then bent in the opposite direction along the thickness direction of the first portion to form the second portion, and at least a part of the second portion covers the surface of the second tab and is welded to the second tab.
6. The cylindrical battery according to any one of claims 2 to 5, wherein the first portion is provided with a plurality of through holes.
7. The cylindrical battery of claim 6, wherein the outer surface of the first portion is further covered with an insulating polymer layer.
8. The cylindrical battery according to any one of claims 2 to 5 wherein the housing comprises a wall and a cover plate for sealing an opening in the wall at the end of the second tab.
9. The cylindrical battery as claimed in claim 8, wherein an insulating layer is provided on one side of the cap plate adjacent to the second tab.
10. The cylindrical battery according to claim 1 further comprising a current collecting disc disposed between the first tab and the housing, wherein the first tab is electrically connected to the housing through the current collecting disc, and wherein the current collecting disc is disposed in an insulating manner from the current conducting member.
11. The cylindrical battery according to claim 1, wherein the first tab is a positive tab, the second tab is a negative tab, and the casing is an aluminum casing; or the first pole lug is a negative pole lug, the second pole lug is a positive pole lug, and the shell is a steel shell.
12. A method of manufacturing a cylindrical battery according to any one of claims 1 to 11, comprising the steps of:
s1, placing the electrode assembly in the shell assembly, and welding a first tab on the electrode assembly with a shell at one end where the electrode terminal is located;
s2, extending the drainage piece into an accommodating space formed by the inner diameter of the winding core along the tab outlet direction, welding one end of the drainage piece with the electrode terminal, and welding the other end of the drainage piece with the second tab;
and S3, sealing the end part where the second pole lug is located, and keeping the second pole lug and the shell in an insulation mode to finish the preparation of the cylindrical battery.
13. A battery pack comprising the cylindrical battery according to any one of claims 1 to 11.
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| CN202210415344.3A CN114792868A (en) | 2022-04-20 | 2022-04-20 | Cylindrical battery, preparation method thereof and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210415344.3A CN114792868A (en) | 2022-04-20 | 2022-04-20 | Cylindrical battery, preparation method thereof and battery pack |
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