CN115133228B - Lithium ion battery current collection structure - Google Patents
Lithium ion battery current collection structure Download PDFInfo
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- CN115133228B CN115133228B CN202210600375.6A CN202210600375A CN115133228B CN 115133228 B CN115133228 B CN 115133228B CN 202210600375 A CN202210600375 A CN 202210600375A CN 115133228 B CN115133228 B CN 115133228B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 112
- 238000004804 winding Methods 0.000 claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 238000004898 kneading Methods 0.000 abstract description 10
- 238000003466 welding Methods 0.000 description 17
- 239000003792 electrolyte Substances 0.000 description 14
- 238000003825 pressing Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920006380 polyphenylene oxide Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- -1 Polytetrafluoroethylene Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
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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
- H01M10/052—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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a lithium ion battery current collection structure, which relates to the field of new energy, and comprises the following components: the winding core is provided with tabs at two ends; the first current collecting assembly is arranged at one end of the winding core; the second current collecting assembly is arranged at the other end of the winding core, a supporting mechanism extends from the second current collecting assembly, the supporting mechanism is in contact with the first current collecting assembly, a first gas-liquid port is formed in the second current collecting assembly, and a second gas-liquid port is formed in the supporting mechanism; the battery pole lug kneading device comprises a first gas-liquid pipe, wherein one end of the first gas-liquid pipe is communicated with a first gas-liquid port, and the first gas-liquid port is communicated with a second gas-liquid port through the first gas-liquid pipe.
Description
Technical Field
The invention relates to the field of new energy, in particular to a lithium ion battery current collection structure.
Background
The common lithium ion battery is of three types, namely a cylindrical type, a square type and a soft package type, the cylindrical lithium ion battery has high energy density due to small redundant space inside the battery, and the cycle life is long due to relatively small expansion of a circular roll core. In cylindrical lithium ion battery, traditional utmost point ear generally all welds 1 ~ 2 on every pole piece, and these 1 ~ 2 utmost point ears are convoluteed at the pole piece and then require to be alignment relation just can the fifty percent discount welding, the cylinder of this kind of 1 ~ 2 utmost point ear structure still wide application in numerous fields such as digital, electric tool, electric automobile now, but, along with the demand to power is higher and higher, the traditional utmost point ear structure of cylinder battery can't satisfy the performance demand, the structure of full utmost point ear begins to appear in the cylinder battery.
The full pole ear of the cylindrical battery generally needs to be kneaded and flattened to form a plane before being welded, the traditional battery structure and instrument can not realize the process, although some newly developed semi-mature instruments can have kneading and flattening actions, the pole ear is not uniformly stressed due to the single kneading and translation action, the kneading and flattening plane of the pole ear is easy to warp, when the inward warping of the kneading and flattening plane of the pole ear leads to being too close to the diaphragm, the diaphragm is easy to melt, the short-circuit risk is large, in addition, the inward or outward warping of the kneading and flattening plane of the pole ear leads to the uneven contact between the kneading and flattening plane of the pole ear and the pole, and further leads to uneven welding.
The tab is flattened and may be torn and fall off due to excessive stress at a part of the tab during subsequent working, which may cause serious safety problems such as short circuit.
In addition, because the mass flow structure of full utmost point ear is bigger than the weight of traditional utmost point ear, often shakes the operating mode among the power battery service condition for the mass flow structure is used down for a long time and is dropped because unstable, so need strengthen the mechanical stability of mass flow structure.
Disclosure of Invention
The invention aims to provide a lithium ion battery structure, which enhances the structural stability of the lithium ion battery.
In order to achieve the above purpose, the invention provides the following technical scheme: a lithium ion battery current collection structure, comprising: the winding core is provided with tabs at two ends; the first current collecting assembly is arranged at one end of the winding core; the second collecting assembly is arranged at the other end of the winding core, a supporting mechanism extends from the second collecting assembly, the supporting mechanism is in contact with the first collecting assembly, a first gas-liquid port is formed in the second collecting assembly, and a second gas-liquid port is formed in the supporting mechanism; one end of the first gas-liquid pipe is communicated with the first gas-liquid port, and the first gas-liquid port is communicated with the second gas-liquid port through the first gas-liquid pipe.
Further, in the above lithium ion battery current collecting structure, the second current collecting assembly is provided with a vent hole and a third gas-liquid port, the third gas-liquid port faces the winding core, and the vent hole deviates from the winding core.
Further, in the above current collecting structure of the lithium ion battery, the second current collecting assembly includes a pressing disk and a supporting disk, the supporting disk is located between the pressing disk and the winding core, the tab extends into a space between the supporting disk and the pressing disk, and the supporting disk is connected with the pressing disk so as to clamp the tab.
Further, in the above-mentioned lithium ion battery current collecting structure, a cavity is provided on the support plate, the third gas-liquid port is provided on a side wall of the support plate close to the tab, the vent and the first gas-liquid port are provided on a side wall of the support plate far from the tab, and both the third gas-liquid port and the vent are communicated with the cavity.
Further, in the above-mentioned current collecting structure for a lithium ion battery, the supporting mechanism includes a second gas-liquid tube, one end of the second gas-liquid tube is connected to the supporting plate, the second gas-liquid tube is communicated with the cavity, the other end of the first gas-liquid tube extends into the second gas-liquid tube, and the second gas-liquid port is disposed on a side wall of the second gas-liquid tube.
Further, in the above current collecting structure for the lithium ion battery, the supporting mechanism further includes an insulating layer, the insulating layer is connected to the other end of the second gas-liquid pipe, and the insulating layer is abutted to the first current collecting assembly.
Further, in the current collecting structure of the lithium ion battery, a central axis of the first gas-liquid port is collinear with a central axis of the support plate.
Further, in the above described current collecting structure for a lithium ion battery, the support plate includes a main body portion and a guide portion, one end of the guide portion is connected to the main body portion, and the other end of the guide portion extends toward the winding core; the outer surface of the guide portion gradually shrinks from one end of the guide portion to the other end of the guide portion.
Further, in the above described current collecting structure for a lithium ion battery, the number of the third gas-liquid ports is plural, and the plural third gas-liquid ports are uniformly arranged on the guiding portion; the number of the vent holes is plural, and the plurality of vent holes are annularly arranged on the main body part.
Further, in the current collecting structure of the lithium ion battery, the first gas-liquid pipe is located in the cavity, and a central axis of the first gas-liquid pipe is collinear with a central axis of the support disc.
The invention can effectively prevent the lug from warping by the supporting plate and the pressing plate, quickly and efficiently rub and flatten the lug by the second gas-liquid pipe, the third gas-liquid port and the vent, and efficiently inject electrolyte by the second gas-liquid pipe, thereby remarkably improving the production efficiency of the battery.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional structural view of the support disk and second gas-liquid line of an embodiment of the invention.
FIG. 3 is a schematic front view of the support disk and second gas-liquid line configuration of an embodiment of the invention.
Fig. 4 is an enlarged view of fig. 1 at a.
Description of reference numerals: 1. a winding core; 2. a support disc; 201. a main body portion; 202. a guide section; 3. pressing the disc; 4. a second gas-liquid line; 5. vent, 6, third gas-liquid port; 7. a cavity; 8. a first gas-liquid port; 9. a central bore; 10. an insulating layer; 11. a first current collecting assembly; 12. a second gas-liquid port; 13. a first gas-liquid pipe; 14. a support mechanism; 15. a second current collecting assembly.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," "third," and "fourth," etc. may be used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of an individual component.
As shown in fig. 1 to 4, according to an embodiment of the present invention, there is provided a current collecting structure of a lithium ion battery, including: the winding core 1 is provided with tabs at two ends of the winding core 1; the first current collecting assembly 11 is arranged at one end of the winding core 1; the second current collecting assembly 15 is arranged at the other end of the winding core 1; the second collecting component 15 is extended with a supporting mechanism 14, the supporting mechanism 14 is in contact with the first collecting component 11, the second collecting component 15 is provided with a first gas-liquid port 8, the supporting mechanism 14 is provided with a second gas-liquid port 12, a first gas-liquid pipe 13, one end of the first gas-liquid pipe 13 is communicated with the first gas-liquid port 8, and the first gas-liquid port 8 is communicated with the second gas-liquid port through the first gas-liquid pipe 13.
Preferably, the second collecting component 15 is provided with a vent 5 and a third gas-liquid port 6, the third gas-liquid port 6 faces the winding core 1, and the vent 5 faces away from the winding core 1. Each part of the tab can be adsorbed on the first current collecting assembly 11 at one time through the third gas-liquid port 6 and the vent 5, so that the welding effect of the tab is improved.
Preferably, the second current collecting assembly 15 comprises a press-fit disc 3 and a supporting disc 2, the supporting disc 2 is located between the press-fit disc 3 and the winding core 1, a part of a tab extends between the supporting disc 2 and the press-fit disc 3, the supporting disc 2 is connected with the press-fit disc 3 to clamp the tab, and the connection mode of the current collecting disc and the press-fit disc 3 is welding. The supporting plate 2 plays a role of supporting the lug and the pressing plate 3 in the invention, and the pressing plate 3 is used for fixing the lug together with the supporting plate 2. The supporting mechanism 14 supports the supporting plate 2, so that the supporting plate 2 can better support the press-fit plate 3, and finally, the effective contact area during tab welding is large and the mechanical structure is stable through the supporting plate 2, the press-fit plate 3 and the supporting mechanism 14, and meanwhile, compared with the traditional mode that the position of the central hole 9 of the winding core 1 is empty and nothing is left, the mechanical support provided by the supporting mechanism 14 can resist the expansion in the circulating overcharge, the mechanical structure is more stable, and the circulating life is longer.
Preferably, be equipped with cavity 7 on the supporting disk 2, third gas-liquid mouth 6 locates a lateral wall that is close to utmost point ear on the supporting disk 2, blow vent 5 and first gas-liquid mouth 8 locate a lateral wall that keeps away from utmost point ear on the supporting disk 2, and blow vent 5 is close to the edge of supporting disk 2, third gas-liquid mouth 6 and blow vent 5 all communicate with cavity 7, the passageway of gas circulation and buffering can be regarded as to cavity 7 structure, realized blow vent 5, the gas circulation between third gas-liquid mouth 6 and the second gas-liquid mouth 12, when pouring into electrolyte into, cavity 7 can regard as the liquid storehouse of storing electrolyte again.
Preferably, the supporting mechanism 14 comprises a second gas-liquid pipe 4, one end of the second gas-liquid pipe 4 is connected with the supporting plate 2, the second gas-liquid pipe 4 is communicated with the cavity 7, the other end of the first gas-liquid pipe 13 extends into the second gas-liquid pipe 4, and the second gas-liquid port 12 is formed in the side wall of the second gas-liquid pipe 4. The supporting plate 2 plays a role of supporting the lug and the pressing plate 3 in the invention, and the pressing plate 3 is used for fixing the lug together with the supporting plate 2. The supporting mechanism 14 supports the supporting plate 2, so that the supporting plate 2 can better support the press-fit disc 3, and finally, the effective contact area during tab welding is large and the mechanical structure is stable through the supporting plate 2, the press-fit disc 3 and the supporting mechanism 14, and meanwhile, compared with the traditional core 1 with no structure at the center hole 9, the invention provides mechanical support through the supporting mechanism 14, can resist expansion during circulating overcharge, has more stable mechanical structure and longer circulating service life, and in addition, electrolyte injected into the first gas-liquid port can be guided through the first gas-liquid pipe 13 and is introduced into the second gas-liquid pipe 4, so that the electrolyte is prevented from splashing into the vent 5, and if the electrolyte flows out from the vent 5, the electrolyte capable of being used is less, and the electrolyte absorbed to the core 1 has poor consistency, so that the consistency of battery performance is poor, and in addition, the electrolyte directly contacts the tab and corrodes the tab to deteriorate the tab welding stability, so that the electrolyte can not flow out from the vent 5 through the first gas-liquid pipe 13.
Preferably, the supporting mechanism 14 further comprises an insulating layer 10, the insulating layer 10 is connected with the other end of the second gas-liquid pipe 4, the insulating layer 10 is abutted to the first current collecting assembly 11, and the insulating layer 10 has the characteristics of high temperature resistance and micro-elasticity. The insulating layer 10 is a member that prevents the current collecting structure of one electrode from forming a short circuit with the other electrode. Since the first current collecting member 11 and the second current collecting member 15 of the present invention have a large current during use and may melt a colloid material, the insulating layer 10 may be made of a high temperature resistant polymer material such as Polytetrafluoroethylene (PTFE), polyimide (PI), polyphenylene oxide (PPO/PPE), polyphenylene sulfide (PPS), or polyether ether ketone (PEEK). And because insulating layer 10 is little elasticity, can play the mechanics cushioning effect (similar to the spring principle), this kind of flexible coupling can avoid causing the destruction when bracing piece and anodal mass flow structure contact.
Preferably, the central axis of the first gas-liquid port 8 is collinear with the central axis of the support disk 2.
Preferably, the support plate 2 includes a main body 201 and a guide portion 202, one end of the guide portion 202 is connected to the main body 201, and the other end of the guide portion 202 extends toward the winding core 1; the outer surface of the guide portion 202 gradually shrinks from one end of the guide portion 202 to the other end of the guide portion 202, the guide portion 202 is convex, the convex guide portion 202 can guide the tab to extend upwards, and the bending angle of the tab can be controlled through the guide portion 202, so that the tab is bent at a smaller bending angle, the possibility of tab fracture is reduced, and the attaching effect of the tab and the guide portion 202 is improved.
Preferably, the number of the third gas-liquid ports is multiple, and the multiple third gas-liquid ports are uniformly arranged on the guide portion 202; the number of the vent holes 5 is plural, and the plurality of vent holes 5 are arranged in a ring shape in the main body 201.
Preferably, a first gas-liquid tube 13 is located within the cavity 7, the central axis of the first gas-liquid tube 13 being collinear with the central axis of the support disc 2.
The specific use of this structure is as follows: when kneading and flattening, the third gas-liquid port 6 sucks air to enable the lug to be tightly attached to the guide part 202 of the support disc 2, so that effective welding points between the lug and the guide part 202 of the support disc 2 are increased, the lug positioned at the innermost circle after welding is used for blocking all the third gas-liquid ports 6, and the lug at the outermost circle is not welded with the main body part 201 of the support disc 2, so that the vent 5 is not blocked, namely, only the vent 5 is left.
When the press-fit disc 3 is close to the support disc 2 until the press-fit disc 3 and the support disc 2 completely clamp the outer-most ring of lugs, air is blown from the first air-liquid port 8, the air escapes from the air vent 5, and the outer-most ring of lugs are blown to be tightly attached to the circular press-fit disc 3, so that welding is performed on the premise that the contact area between the outermost ring of lugs and the press-fit disc 3 is increased and effective welding points are increased; after the welding, air is sucked from the first air-liquid port 8, the negative pressure in the supporting disc 2 of the structure is strong, the lug clamped between the supporting disc 2 and the pressing disc 3 can be further close to the supporting disc 2, the welding is carried out under the condition that the effective welding points of the lug and the supporting disc 2 are increased, and the welding of the lug is finished in a mode of firstly sucking air, then blowing air and finally sucking air;
after the welding of utmost point ear is accomplished, pour into electrolyte into through first gas-liquid mouth 8, electrolyte enters into and discharges from second gas-liquid mouth 12 behind the supporting disk 2.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the injection speed of the electrolyte is increased through the second gas-liquid port 12 on the second gas-liquid pipe 4, and the influence of air on the performance of the electrolyte is reduced;
the welding effect of the lug, the supporting disc 2 and the pressing disc 3 is obviously improved by arranging the third gas-liquid port 6 and the vent 5;
the supporting plate 2 and the pressing plate 3 can effectively prevent the lug kneading plane from warping, and greatly reduce the possibility of warping after the lug kneading plane;
after the structure is installed, the overall mechanical structure of the battery is more stable through the second gas-liquid pipe, and the cycle life of the battery is prolonged;
the electrode lug can be more smoothly contacted with the second current collecting assembly 15 through the guide part 202, the phenomenon that the electrode lug is broken and falls off is avoided, the electrode lug is tightly contacted with the second current collecting assembly 15, the effective contact area is large, and therefore the impedance of the battery is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A lithium ion battery current collection structure, comprising:
the winding core is provided with tabs at two ends;
the first current collecting assembly is arranged at one end of the winding core;
the second collecting assembly is arranged at the other end of the winding core, a supporting mechanism extends from the second collecting assembly, the supporting mechanism is in contact with the first collecting assembly, a first gas-liquid port is formed in the second collecting assembly, and a second gas-liquid port is formed in the supporting mechanism;
one end of the first gas-liquid pipe is communicated with the first gas-liquid port, and the first gas-liquid port is communicated with the second gas-liquid port through the first gas-liquid pipe;
the second collecting component is provided with a vent hole and a third gas-liquid port, the third gas-liquid port faces the winding core, and the vent hole faces away from the winding core;
the second current collecting assembly comprises a press-fit disc and a supporting disc, the supporting disc is located between the press-fit disc and the winding core, the tab extends into the space between the supporting disc and the press-fit disc, and the supporting disc is connected with the press-fit disc so as to clamp the tab.
2. The lithium ion battery current collecting structure of claim 1, wherein a cavity is formed on the support plate, the third gas-liquid port is formed on a side wall of the support plate close to the tab, the vent and the first gas-liquid port are formed on a side wall of the support plate far away from the tab, and both the third gas-liquid port and the vent are communicated with the cavity.
3. The lithium ion battery current collecting structure according to claim 2, wherein the supporting mechanism includes a second gas-liquid tube, one end of the second gas-liquid tube is connected to the supporting plate, the second gas-liquid tube is communicated with the cavity, the other end of the first gas-liquid tube extends into the second gas-liquid tube, and the second gas-liquid port is formed in a side wall of the second gas-liquid tube.
4. The lithium ion battery current collecting structure according to claim 3, wherein the supporting mechanism further comprises an insulating layer, the insulating layer is connected with the other end of the second gas-liquid pipe, and the insulating layer abuts against the first current collecting assembly.
5. The current collecting structure for lithium ion battery according to claim 1, wherein the central axis of the first gas-liquid port is collinear with the central axis of the support disk.
6. The lithium ion battery current collecting structure according to claim 1, wherein the support disk comprises a main body portion and a guiding portion, one end of the guiding portion is connected with the main body portion, and the other end of the guiding portion extends towards the winding core;
the outer surface of the guide portion gradually shrinks from one end of the guide portion to the other end of the guide portion.
7. The lithium ion battery current collecting structure according to claim 6, wherein the number of the third gas-liquid ports is plural, and the plural third gas-liquid ports are uniformly arranged on the guide portion;
the number of the air vents is plural, and the plural air vents are annularly arranged on the main body.
8. The lithium ion battery current collecting structure according to claim 2, wherein the first gas-liquid pipe is located in the cavity, and a central axis of the first gas-liquid pipe is collinear with a central axis of the support disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600375.6A CN115133228B (en) | 2022-05-28 | 2022-05-28 | Lithium ion battery current collection structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600375.6A CN115133228B (en) | 2022-05-28 | 2022-05-28 | Lithium ion battery current collection structure |
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| Publication Number | Publication Date |
|---|---|
| CN115133228A CN115133228A (en) | 2022-09-30 |
| CN115133228B true CN115133228B (en) | 2023-03-10 |
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| CN202210600375.6A Active CN115133228B (en) | 2022-05-28 | 2022-05-28 | Lithium ion battery current collection structure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN214378767U (en) * | 2021-02-20 | 2021-10-08 | 成都市银隆新能源有限公司 | Cylindrical battery |
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| JP3445171B2 (en) * | 1998-11-04 | 2003-09-08 | 日本碍子株式会社 | Lithium secondary battery |
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| KR102397857B1 (en) * | 2015-07-15 | 2022-05-12 | 삼성에스디아이 주식회사 | Rechargeable battery and rechargeable battery module using the same |
| KR102659830B1 (en) * | 2018-01-09 | 2024-04-23 | 삼성에스디아이 주식회사 | Secondary battery And Fabricating Method Thereof |
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| JPH11162521A (en) * | 1997-11-28 | 1999-06-18 | Sanyo Electric Co Ltd | Cylindrical lithium secondary battery |
| CN203674314U (en) * | 2013-12-24 | 2014-06-25 | 益阳科力远电池有限责任公司 | Current collecting device for circular battery |
| CN214378767U (en) * | 2021-02-20 | 2021-10-08 | 成都市银隆新能源有限公司 | Cylindrical battery |
| CN113851737A (en) * | 2021-08-26 | 2021-12-28 | 合肥国轩高科动力能源有限公司 | Manufacturing method of cylindrical lithium ion battery |
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