CN116315522B - Liquid absorption structure of battery, preparation method of liquid absorption structure, battery and power utilization device - Google Patents
Liquid absorption structure of battery, preparation method of liquid absorption structure, battery and power utilization device Download PDFInfo
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- CN116315522B CN116315522B CN202310563869.6A CN202310563869A CN116315522B CN 116315522 B CN116315522 B CN 116315522B CN 202310563869 A CN202310563869 A CN 202310563869A CN 116315522 B CN116315522 B CN 116315522B
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- battery
- positioning column
- liquid absorbing
- base body
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- 239000007788 liquid Substances 0.000 title claims abstract description 136
- 238000010521 absorption reaction Methods 0.000 title abstract description 16
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 230000003139 buffering effect Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 2
- 239000003792 electrolyte Substances 0.000 abstract description 30
- 230000000694 effects Effects 0.000 abstract description 11
- 230000008595 infiltration Effects 0.000 abstract description 6
- 238000001764 infiltration Methods 0.000 abstract description 6
- 230000035515 penetration Effects 0.000 abstract description 2
- 238000003466 welding Methods 0.000 description 9
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005213 imbibition Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H01M50/70—Arrangements for stirring or circulating the electrolyte
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The application belongs to the technical field of batteries, and particularly relates to a liquid absorption structure of a battery, which comprises a positioning column and a base body, wherein one end of the positioning column is connected to the base body, the other end of the positioning column is a free end, at least one liquid absorption piece is arranged on the periphery between the opposite ends of the positioning column and extends towards the opposite ends of the positioning column, the liquid absorption piece is embedded into the periphery of the positioning column or at least partially exposed out of the periphery of the positioning column, the base body is provided with at least one through hole, and at least part of a single liquid absorption piece penetrates through a single hole. The application enhances the penetration of electrolyte, improves the infiltration effect of the upper isolating film and the positive and negative pole pieces in the battery core, prolongs the service life of the battery, and can improve the space utilization rate of the battery and effectively improve the energy density of the battery by fully utilizing the internal space of the battery. In addition, the application also discloses a battery, an electric device and a preparation method of the liquid absorption structure of the battery.
Description
Technical Field
The application belongs to the technical field of batteries, and particularly relates to a liquid absorption structure of a battery, a preparation method of the liquid absorption structure, the battery and an electric device.
Background
The lithium ion battery has the advantages of light weight, high capacity, long service life, low self-discharge rate, no memory effect, no pollution and the like, and along with the development of modern society, the enhancement of people's environmental awareness and the increasingly development of new energy industries, more and more devices select the lithium ion battery as a power supply, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, so that a wide space is provided for the application and development of the lithium ion battery.
However, in the existing cylindrical battery, the cylindrical battery cell, especially the longer battery cell, is difficult to absorb the electrolyte accumulated at the bottom of the case due to the concentration of the electrolyte at the bottom of the case, and the wettability of the separator and the positive and negative electrode plates in the battery cell is poor, so that the electrical performance and the cycle life of the battery can be seriously affected. For this reason, a new solution is needed to solve the above problems.
Disclosure of Invention
One of the objects of the present application is: aiming at the defects of the prior art, the liquid absorption structure of the battery is provided, the permeation of electrolyte can be enhanced, the effects of upper isolating film and positive and negative pole piece infiltration in the battery core are improved, the service life of the battery is prolonged, the internal space of the battery can be fully utilized, the space utilization rate of the battery is improved, and the energy density of the battery is effectively improved.
In order to achieve the above purpose, the present application adopts the following technical scheme: a liquid-absorbing structure of a battery, comprising:
positioning columns;
the positioning device comprises a seat body, wherein one end of the positioning column is connected to the seat body, and the other end of the positioning column is a free end;
at least one liquid absorbing piece is arranged on the periphery side between the opposite ends of the positioning column, and extends towards the opposite ends of the positioning column;
the liquid absorbing piece is embedded into the peripheral side of the positioning column or at least partially exposed out of the peripheral side of the positioning column;
the base body is provided with at least one penetrating hole, and at least part of each liquid absorbing piece penetrates through each hole.
Preferably, the liquid absorbing piece comprises a first liquid absorbing section and a second liquid absorbing section which are integrally connected or arranged in a split mode, the first liquid absorbing section penetrates through the hole and extends out of two openings of the hole respectively, the second liquid absorbing section extends from the free end to the base body, and the first liquid absorbing section and the second liquid absorbing section can improve flowing efficiency of electrolyte.
Preferably, the first liquid absorbing sections and the holes are in one-to-one correspondence, and the holes are distributed on the base body at intervals so as to absorb electrolyte accumulated at the bottom of the shell more comprehensively.
Preferably, the plurality of holes are symmetrically or asymmetrically arranged along the central line of the positioning column, so as to ensure that each first liquid absorbing section is reasonably distributed on the seat body.
Preferably, the circumference side of reference column is provided with one or more spacing groove, the second imbibition section set up in the spacing groove, the second imbibition section inlay locate the spacing groove or at least part expose in the spacing groove, in order to improve the installation fastness of second imbibition section.
Preferably, the positioning column is provided with a fixing part corresponding to the limiting groove, the second liquid suction section is arranged on the fixing part, the fixing part can be flush with the periphery of the positioning column, and the fixing part plays a role in limiting and fixing or fastening the second liquid suction section so as to prevent the second liquid suction section from falling out of the limiting groove.
Preferably, the positioning column extends from the surface of the base along a first direction, the free end is provided with a first through groove extending along the first direction, the base is provided with a second through groove communicated with the first through groove, and the first through groove and the second through groove are used for realizing free flow of electrolyte.
Preferably, a plurality of permeation holes communicated with the first through groove are formed in the peripheral side of the positioning column, the permeation holes are used for realizing the exudation of the electrolyte, and the permeation holes are distributed on the peripheral side of the positioning column at intervals, wherein the permeation holes can be arranged in an array mode, so that the exudation efficiency of the electrolyte is improved.
Preferably, one surface of the base body, which is opposite to the positioning column, is provided with a plurality of protruding buffer parts, and the protruding buffer parts are distributed on the base body at intervals, wherein the protruding buffer parts can improve the structural strength of the base body.
Preferably, a groove is formed between two adjacent convex buffering portions, wherein the groove can more effectively avoid electrolyte accumulating on one surface of the seat body, which is opposite to the positioning column, so that gaps are formed between a plurality of convex buffering portions, and the flowing speed of the electrolyte is increased.
Preferably, a surface of the base facing the positioning column is a plane, the positioning column is perpendicular to the plane, a surface of the base facing the positioning column is used for being attached to one end of the battery cell without positive and negative lugs, and the positioning column is used for being inserted into a central hole of the battery cell.
Preferably, the positioning post, the first through groove and the second through groove are all arranged relative to the center of the plane.
Preferably, the positioning column is cylindrical, the seat body is disc-shaped, the plurality of protruding buffer parts are distributed on the seat body at equal intervals, and the number of the protruding buffer parts is at least three.
Another object of the present application is to provide a battery comprising: a wicking structure as described above; a housing;
the battery cell is accommodated in the shell and is provided with a through hole penetrating along the height direction;
the base set up in between the electric core with the diapire of casing, the reference column with the imbibition piece all install in the through-hole, the one end butt of electric core in the hole.
Preferably, the shell is connected with a cap, one end of the shell is provided with an opening, the cap is buckled on the opening, one end of the positioning column away from the base is abutted with the cap, and the base is abutted with the peripheral wall of the shell.
The third object of the present application is to: there is provided an electrical device comprising a battery as described above.
The application provides a preparation method of a liquid absorption structure of a battery, which comprises the following steps:
s1, forming at least one through hole on the surface of a seat body, connecting one end of a positioning column to the seat body, and mounting at least one liquid suction piece on the periphery between two opposite ends of the positioning column;
s2, embedding the liquid absorbing piece into the peripheral side of the positioning column or enabling at least part of the liquid absorbing piece to be exposed out of the peripheral side of the positioning column, and enabling the liquid absorbing piece to extend towards the opposite ends of the positioning column;
s3, enabling at least part of the liquid absorbing piece to pass through the hole.
The application has the beneficial effects that:
1) The liquid suction structure comprises a positioning column and a base body, wherein one end of the positioning column is connected to the base body, the other end of the positioning column is a free end, at least one liquid suction piece is arranged on the periphery between the two opposite ends of the positioning column, the positioning column can be inserted into a battery core, the liquid suction piece extends towards the two opposite ends of the positioning column, so that the liquid suction piece can suck electrolyte in the battery core to promote the electrolyte to circularly flow in the battery core, the permeation effect of the electrolyte can be enhanced by installing at least one liquid suction piece on the periphery of the positioning column, the effect of improving the infiltration effect of an upper isolating film and positive and negative pole pieces in the battery core is achieved, and the service life of the battery is remarkably prolonged;
2) The liquid absorbing piece can be embedded into the peripheral side of the positioning column or at least partially exposed out of the peripheral side of the positioning column, meanwhile, the base body is provided with at least one penetrating hole, at least part of a single liquid absorbing piece penetrates through the single hole, and when the base body is close to or abutted against the bottom of the battery shell, the liquid absorbing piece can absorb electrolyte accumulated on the bottom of the battery shell, so that the liquid absorbing structure can fully utilize the internal space of the battery, the space utilization rate of the battery is improved, the penetrating effect of the electrolyte in the battery is better, and the energy density of the battery can be remarkably and effectively improved.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present application.
Fig. 2 is a schematic structural view of a liquid absorbing member according to a first embodiment of the present application.
Fig. 3 is a schematic structural diagram of a positioning post and a base according to a first embodiment of the present application.
Fig. 4 is a schematic structural diagram of a positioning post and a base according to another view angle of the first embodiment of the present application.
Fig. 5 is a schematic structural diagram of a positioning post and a base according to a second embodiment of the present application.
Fig. 6 is a second schematic structural diagram of a positioning post and a base according to a second embodiment of the present application.
Fig. 7 is an assembly schematic diagram of a positioning post, a base and a battery cell according to a third embodiment of the present application.
Fig. 8 is a schematic structural diagram of a third embodiment of the present application.
Wherein reference numerals are as follows:
1. positioning columns; 1a, free end; 10. a first through groove; 11. a penetration hole; 12. a limit groove; 13. a fixing part;
2. a base; 20. a second through slot; 21. a hole; 22. a convex buffer part;
3. a liquid absorbing member; 31. a first liquid intake section; 32. a second liquid suction section;
4. a housing; 5. a battery cell; 6. capping;
t1, a first direction; t2, the height direction of the battery cell.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The present inventors have found that the conventional cylindrical battery has at least the following drawbacks: 1) For a cylindrical battery cell, particularly a longer battery cell, electrolyte concentrated at the bottom of the shell is difficult to absorb due to concentration of the electrolyte at the bottom of the shell, and the wettability of an isolating film and positive and negative plates in the battery cell is poor, so that the electrical performance and the cycle life of the battery can be seriously influenced; 2) When the battery core moves in the battery shell, the electrode lug can be pulled to cause local fracture of the electrode lug, so that unknown hidden dangers such as unstable overcurrent and large temperature rise of the battery are generated; 3) The gap between the battery core and the battery shell easily causes slight shaking, movement or collision of the battery core in the battery shell when the battery is in loading vibration, and the battery core can be damaged, so that the problem of electrical performance is caused; 4) The safety performance and the immersion efficiency of the battery cell in the battery shell cannot be effectively considered. Accordingly, the inventors have originally developed a battery with a liquid absorbing structure to solve the above-described problems.
The present application will be described in further detail with reference to fig. 1 to 8, but is not limited thereto.
Embodiment one
A first embodiment will be described with reference to fig. 1 to 4.
A liquid-absorbing structure of a battery, comprising:
a positioning column 1;
the device comprises a base body 2, wherein one end of a positioning column 1 is connected to the base body 2, and the other end of the positioning column 1 is a free end 1a;
the circumference side between the opposite ends of the positioning column 1 is provided with a liquid absorbing piece 3, the liquid absorbing piece 3 extends towards the opposite ends of the positioning column 1, the liquid absorbing piece 3 is embedded into the circumference side of the positioning column 1 or at least partially exposed out of the circumference side of the positioning column 1, the base 2 is provided with at least one through hole 21, at least part of the liquid absorbing piece 3 penetrates through the single hole 21, when the positioning column 1 is inserted into a battery core, the liquid absorbing piece 3 can absorb electrolyte in the battery core to promote the electrolyte to circularly flow in the battery core, and the end part of the liquid absorbing piece 3 can be abutted with the base 2 together, so that the liquid absorbing piece 3 can absorb electrolyte gathered at the bottom of the battery shell to promote the permeation effect of the electrolyte in the battery, and therefore, the liquid absorbing structure can improve the effects of upper isolating film and positive and negative pole pieces in the battery core, and effectively solve the technical problems of poor electrical performance and cycle life of the battery.
Further, in the present embodiment, referring to fig. 2, the liquid absorbing member 3 includes a first liquid absorbing section 31 and a second liquid absorbing section 32 which are integrally connected or separately provided, the first liquid absorbing section 31 passes through the hole 21 and respectively protrudes from two openings of the hole 21, and the second liquid absorbing section 32 extends from the free end 1a of the positioning column 1 to the base 2. The first liquid absorbing sections 31 are provided with a plurality of first liquid absorbing sections 31, the first liquid absorbing sections 31 are of a first liquid absorbing backflow structure, at least part of the first liquid absorbing sections 31 or the part of the first liquid absorbing sections 31 extending out of one surface of the base body 2, which is opposite to the positioning column 1, can be in a sucker shape, and the first liquid absorbing sections 31 are used for absorbing and draining electrolyte of one surface of the base body 2, which is opposite to the positioning column 1, to one surface of the base body 2, which is opposite to the positioning column 1. The second liquid absorbing section 32 can be one, and the second liquid absorbing section 32 is a secondary liquid absorbing reflux structure which can be spirally lifted to the top of the battery core along the surface of the positioning column 1 and can be attached to the isolating film of the central hole of the battery core.
Preferably, a part of the plurality of first liquid absorbing sections 31 is integrally connected with one end of one second liquid absorbing section 32, and the plurality of first liquid absorbing sections 31 are distributed on the base 2 at intervals.
Preferably, referring to fig. 3 and fig. 4, the base 2 has a plurality of through holes 21, the plurality of first liquid absorbing sections 31 are in one-to-one correspondence with the plurality of holes 21, and the plurality of holes 21 are distributed on the base 2 at intervals, wherein the number of holes 21 may be 8-12, so as to improve the flow efficiency of the electrolyte.
Preferably, the plurality of holes 21 are symmetrically or asymmetrically arranged along the central line of the positioning column 1, so as to ensure that the respective first liquid absorbing segments 31 are reasonably distributed in the base 2.
Preferably, the positioning column 1 extends from the surface of the base 2 along the first direction T1, the free end 1a of the positioning column 1 is provided with a first through groove 10 extending along the first direction T1, the base 2 is provided with a second through groove 20 communicated with the first through groove 10, and the first through groove 10 and the second through groove 20 are connected for realizing free flow of electrolyte.
Specifically, reference column 1 and pedestal 2 integrated into one piece or detachable connection, the diameter of pedestal 2 can be greater than the diameter of coiling electric core for pedestal 2 can offset with battery case's perisporium, and when coiling electric core takes place radial vibrations, the impact between coiling electric core and the shell wall can be born to the edge of pedestal 2, has avoided the electric core to appear slightly rocking, the drunkenness or the circumstances of collision in battery case's inside.
After the battery assembly is completed, the central hole of the winding battery core can be fixed by the structure formed by the connection of the positioning column 1 and the base body 2, and when the battery core jumps, the base body 2 and the positioning column 1 which props against the electrode column surface or the welding area in the middle of the current collecting disc limit the battery core, so that the welding position of the electrode lug is effectively avoided.
Preferably, the circumferential side of the positioning column 1 is provided with a plurality of permeation holes 11 communicated with the first through groove 10, and the plurality of permeation holes 11 are distributed on the circumferential side of the positioning column 1 at intervals, wherein the permeation holes 11 can be arranged corresponding to the second liquid suction section 32 so as to improve the exudation efficiency of the electrolyte.
Preferably, the surface of the base 2 facing away from the positioning column 1 is provided with a plurality of convex buffer parts 22, the plurality of convex buffer parts 22 are distributed on the base 2 at intervals, and the plurality of convex buffer parts 22 can further prevent the battery cell from being damaged, so that the immersion efficiency and the safety performance of the battery cell in the battery shell can be considered.
Preferably, a groove is formed between two adjacent convex buffering portions 22, wherein the plurality of convex buffering portions 22 can improve the structural strength of the seat body 2, and the groove can more effectively prevent electrolyte from accumulating on one surface of the seat body 2, which is opposite to the positioning column 1, so that gaps are formed between the plurality of convex buffering portions 22, and the flowing speed of the electrolyte is increased.
Preferably, the plurality of protruding buffer portions 22 are distributed on the base 2 at equal intervals, each protruding buffer portion 22 protrudes outside the surface of the base 2, at least part of the protruding buffer portions 22 can be provided with an arc structure, protruding buffer portions 22 can be arranged between adjacent holes 21 and at the edge of the base 2, and the base 2 can be disc-shaped.
Preferably, the plurality of holes 21 of the base 2 are divided into an outer ring hole and an inner ring hole, the first liquid absorbing section 31 disposed in each outer ring hole is not connected to the second liquid absorbing section 32, and the first liquid absorbing section 31 disposed in each inner ring hole is connected to the second liquid absorbing section 32.
Preferably, a surface of the base 2 facing the positioning column 1 is a plane, the positioning column 1 is perpendicular to the plane, and the first direction T1 is perpendicular to a surface of the base 2 facing the positioning column 1.
Preferably, the positioning column 1, the first through groove 10 and the second through groove 20 are arranged opposite to the center of the plane, wherein the diameters of the first through groove 10 and the second through groove 20 are equal or unequal.
In some embodiments, the liquid absorbing member 3 has a plurality of second liquid absorbing segments 32, and the plurality of second liquid absorbing segments 32 are connected to or disposed at intervals on the circumferential side of the positioning column 1.
Preferably, the positioning column 1 and the seat body 2 are made of plastic materials, and the liquid absorbing piece 3 can be made of hydrophilic high polymer.
The inventor obtains that the capacity retention rate of the battery without the liquid absorbing piece 3 in 1000 cycles is 79.9% -86.1% through a specific battery cycle experiment, and the capacity retention rate of the battery with the liquid absorbing piece 3 in the embodiment in 1000 cycles is 98.2% -98.7%, which fully shows that the primary liquid absorbing backflow structure is connected with the bottom of the shell and the isolating membrane at the bottom of the battery core, and can serve as a current conductor to suck electrolyte at the bottom of the shell back to the isolating membrane at the bottom of the battery core and positive and negative pole pieces for absorption; one end of the secondary imbibition reflux structure is connected with the bottom of the shell, the other end extends to the top position of the battery cell along the surface of the positioning column 1, and the battery cell central hole isolation film and the positive and negative pole pieces are attached, so that the imbibition structure can remarkably improve the infiltration effect of the upper isolation film and the positive and negative pole pieces in the battery cell, and the service life and the cycle performance of the battery are improved.
Second embodiment
Unlike the first embodiment, referring to fig. 5, the positioning column 1 is provided with one or more limiting grooves 12 on the peripheral side, and the second liquid absorbing section 32 is disposed in the limiting groove 12, where the limiting groove 12 may be a groove, and the function of the limiting groove 12 is to make at least part of the second liquid absorbing section 32 be embedded in the limiting groove 12 to fix the second liquid absorbing section 32. In addition, the second liquid suction section 32 is arranged in the limiting groove 12, so that the space occupied by the liquid suction structure on the battery can be reduced, and the space utilization rate of the battery is effectively improved.
Preferably, the positioning column 1 has a fixing portion 13 corresponding to the limiting groove 12, the fixing portion 13 is located on a side wall of the limiting groove 12, and the second liquid absorbing section 32 is disposed on the fixing portion 13.
Referring to fig. 6, the fixing portion 13 may be a fastening structure with at least two fastening pieces, and the at least two fastening pieces are installed on the side wall of the limiting groove 12 in a staggered manner, so that the second liquid absorbing section 32 can pass through the two fastening pieces in a front-back staggered manner, and the two fastening pieces fasten the second liquid absorbing section 32, so as to avoid the second liquid absorbing section 32 falling out from the limiting groove 12.
Other structures of this embodiment are the same as those of the first embodiment, and will not be described here again.
Embodiment III
A battery, see fig. 7 and 8, comprising the wicking structure of either embodiment one or embodiment two; a housing 4;
the battery cell 5 is accommodated in the shell 4, and the battery cell 5 is provided with a through hole penetrating along the height direction T2;
the pedestal 2 is arranged between the battery cell 5 and the bottom wall of the shell 4, the positioning column 1 and the liquid absorbing piece 3 are both arranged in the through hole, and one end of the battery cell 5 is abutted to the hole 21 of the pedestal 2.
Preferably, the casing 4 is connected with the block 6, and the same side of electric core 5 goes out the utmost point ear, and the free end 1a of reference column 1 and the utmost point ear of electric core 5 all are close to block 6 setting, and the one end of casing 4 has the opening, and block 6 lock is in the opening, and the one end that reference column 1 was kept away from pedestal 2 and block 6 butt, and pedestal 2 and the perisporium butt of casing 4. The cap 6 comprises a pole column and a current collecting disc, and one end of the positioning column 1, which is far away from the base body 2, is abutted to a middle welding area of the pole column surface or the current collecting disc.
Preferably, the diameter of the base 2 is 0.1 mm-0.5 mm larger than the diameter of the battery cell 5.
The battery may be a lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like.
The method for assembling the battery comprises the following steps: 1. firstly, carrying out combined winding of the battery cells 5; 2. the positive and negative lugs at the top of the battery cell 5 are respectively connected with the positive and negative current collecting discs through welding; 3. the first liquid absorbing sections 31 of the liquid absorbing piece 3 respectively penetrate through the holes 21 of the base body 2, and the second liquid absorbing sections 32 of the liquid absorbing piece 3 are wound and fixed on the periphery side of the positioning column 1; 4. the positioning column 1 is matched with a through hole (namely a central hole) of the battery cell 5, one end of the positioning column 1 faces to one side of the positive and negative electrode lug, and the base body 2 is attached to one end of the battery cell 5 without the positive and negative electrode lug; 5. the lower part of the seat body 2 is attached to the bottom of the shell 4; one end of the positive or negative current collecting disc is fixed with the cap 6, then the cap 6 and the opening of the shell are welded by laser, and the positioning column 1 is propped against the pole cylindrical surface or the middle welding area of the current collecting disc; 6. resistance welding or torque welding, namely welding a welding area in the middle of the current collecting disc with the pole; 7. and finally, injecting liquid and sealing.
Fourth embodiment
An electric device comprises a battery of the third embodiment, wherein the electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space shuttles, spacecraft, and the like; the electric toy includes fixed or mobile electric toys such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers. The embodiment of the application does not limit the electric device in particular.
Fifth embodiment
A preparation method of a liquid absorption structure of a battery comprises the following steps:
s1, forming at least one through hole 21 on the surface of a seat body 2, connecting one end of a positioning column 1 to the seat body 2, and mounting at least one liquid absorbing piece 3 on the periphery between two opposite ends of the positioning column 1;
s2, embedding the liquid absorbing piece 3 into the peripheral side of the positioning column 1 or exposing at least part of the liquid absorbing piece 3 to the peripheral side of the positioning column 1, and enabling the liquid absorbing piece 3 to extend towards the opposite ends of the positioning column 1;
and S3, enabling at least part of the liquid absorbing piece 3 to pass through the hole 21.
The liquid absorption structure can enhance the infiltration of electrolyte, improve the infiltration effect of the upper isolating film and the positive and negative pole pieces in the battery core, prolong the service life of the battery, and can improve the space utilization rate of the battery and effectively improve the energy density of the battery by fully utilizing the internal space of the battery.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the application pertains from the foregoing disclosure and teachings. Therefore, the present application is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present application in any way.
Claims (12)
1. A liquid absorbing structure of a battery, comprising:
a positioning column (1);
the positioning device comprises a base body (2), wherein one end of a positioning column (1) is connected to the base body (2), and the other end of the positioning column (1) is a free end (1 a);
at least one liquid absorbing piece (3) is arranged on the periphery side between the opposite ends of the positioning column (1), and the liquid absorbing piece (3) extends towards the opposite ends of the positioning column (1);
the liquid absorbing piece (3) is embedded into the peripheral side of the positioning column (1) or at least partially exposed out of the peripheral side of the positioning column (1);
the base body (2) is provided with at least one through hole (21), and at least part of each liquid absorbing piece (3) penetrates through each hole (21).
2. A liquid absorbing structure for a battery as defined in claim 1, wherein: the liquid absorbing piece (3) comprises a first liquid absorbing section (31) and a second liquid absorbing section (32) which are integrally connected or arranged in a split mode, the first liquid absorbing section (31) penetrates through the hole (21) and respectively extends out of two holes of the hole (21), and the second liquid absorbing section (32) extends from the free end (1 a) to the base body (2).
3. A liquid absorbing structure for a battery as defined in claim 2, wherein: the plurality of first liquid absorbing sections (31) are in one-to-one correspondence with the plurality of holes (21), and the plurality of holes (21) are distributed on the base body (2) at intervals.
4. A liquid absorbing structure for a battery as defined in claim 2, wherein: one or more limiting grooves (12) are formed in the periphery of the positioning column (1), and the second liquid suction section (32) is arranged in the limiting grooves (12).
5. A liquid absorbing structure for a battery as defined in claim 4, wherein: the positioning column (1) is provided with a fixing part (13) corresponding to the limiting groove (12), and the second liquid suction section (32) is arranged on the fixing part (13).
6. The liquid absorbing structure of a battery according to any one of claims 1 to 5, wherein: the positioning column (1) extends from the surface of the base body (2) along a first direction (T1), the free end (1 a) is provided with a first through groove (10) extending along the first direction (T1), and the base body (2) is provided with a second through groove (20) communicated with the first through groove (10).
7. A liquid absorbing structure for a battery as defined in claim 6, wherein: a plurality of transmission holes (11) communicated with the first through grooves (10) are formed in the periphery of the positioning column (1), and the transmission holes (11) are distributed on the periphery of the positioning column (1) at intervals.
8. The liquid absorbing structure of a battery according to any one of claims 1 to 5, wherein: the surface of the base body (2) facing away from the positioning column (1) is provided with a plurality of convex buffering parts (22), and the convex buffering parts (22) are distributed on the base body (2) at intervals.
9. A battery, comprising: a liquid absorbing structure according to any one of claims 1 to 8; and
a housing (4);
the battery cell (5) is accommodated in the shell (4), and the battery cell (5) is provided with a through hole penetrating along the height direction (T2) of the battery cell;
the base body (2) is arranged between the battery cell (5) and the bottom wall of the shell (4), the positioning column (1) and the liquid absorbing piece (3) are both arranged in the through hole, and one end of the battery cell (5) is abutted to the hole (21).
10. The battery of claim 9, wherein: the shell (4) is connected with a cap (6), one end of the shell (4) is provided with an opening, the cap (6) is buckled on the opening, one end of the positioning column (1) away from the base (2) is abutted with the cap (6), and the base (2) is abutted with the peripheral wall of the shell (4).
11. An electrical device comprising a battery as claimed in any one of claims 9 to 10.
12. A method for preparing a liquid-absorbing structure of a battery, comprising the steps of:
s1, forming at least one through hole (21) on the surface of a seat body (2), connecting one end of a positioning column (1) to the seat body (2), and mounting at least one liquid suction piece (3) on the periphery between two opposite ends of the positioning column (1);
s2, embedding the liquid absorbing piece (3) into the peripheral side of the positioning column (1) or exposing at least part of the liquid absorbing piece (3) to the peripheral side of the positioning column (1), and enabling the liquid absorbing piece (3) to extend towards the opposite ends of the positioning column (1);
s3, at least part of the liquid absorbing piece (3) passes through the hole (21).
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| CN116315522A (en) | 2023-06-23 |
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