CN111370601A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
- Publication number
- CN111370601A CN111370601A CN202010289768.0A CN202010289768A CN111370601A CN 111370601 A CN111370601 A CN 111370601A CN 202010289768 A CN202010289768 A CN 202010289768A CN 111370601 A CN111370601 A CN 111370601A
- Authority
- CN
- China
- Prior art keywords
- cover plate
- plate body
- lithium ion
- ion battery
- adhesive layer
- Prior art date
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 36
- 239000003292 glue Substances 0.000 claims abstract description 30
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000012790 adhesive layer Substances 0.000 claims description 41
- 239000010410 layer Substances 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 description 11
- 238000009434 installation Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—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
- H01M50/147—Lids or covers
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
-
- 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
-
- 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
-
- 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 discloses a lithium ion battery, which comprises a battery cell, a shell and a cover plate component, wherein the shell is provided with a containing cavity with one open end and the other closed end, the battery cell is arranged in the containing cavity, the cover plate component comprises a cover plate body and a connecting piece arranged on the cover plate body, the connecting piece is in a T-shaped structure, the connecting piece comprises a limiting part and a first connecting part connected with the limiting part, the first connecting part is of a cylindrical structure, the limiting part is arranged at one end of the first connecting part, the size of the limiting part is larger than that of the first connecting part, the cover plate body is provided with a mounting hole along the thickness direction in a penetrating way, the limiting part is arranged on one side surface of the cover plate body deviating from the battery core, the first connecting part is inserted in the mounting hole, the battery cell comprises a positive electrode lug and a negative electrode lug, the negative electrode lug is electrically connected with the first connecting part, the positive electrode lug is electrically connected with the cover plate body or the shell, and an insulating glue layer is bonded between the cover plate body and the connecting piece. The lithium ion battery has high space utilization rate and small size.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium ion battery.
Background
A button cell (button cell) is a cell having an external dimension like a small button, and generally has a larger diameter and a thinner thickness. Among traditional lithium ion button cell, generally including apron subassembly, casing and the setting electric core inside the casing, the apron subassembly is used for the open end of shutoff casing, and the apron subassembly includes apron body and the connecting piece of riveting "worker" style of calligraphy on the apron body. When the cover plate component of the lithium ion battery piece with the structure is plugged at the opening end of the shell, the end part of the connecting piece occupies a larger space in the battery due to the I-shaped structure of the connecting piece, and the size of the lithium ion battery is not favorably reduced.
Disclosure of Invention
The invention aims to: provided is a lithium ion battery which has a high space utilization rate and a small size.
In order to achieve the purpose, the invention adopts the following technical scheme:
the lithium ion battery comprises a battery cell, a shell and a cover plate assembly, wherein the shell is provided with a containing cavity with one open end and the other closed end, the battery cell is arranged in the containing cavity, the cover plate assembly comprises a cover plate body and a connecting piece arranged on the cover plate body, the connecting piece is of a T-shaped structure and comprises a limiting part and a first connecting part connected with the limiting part, the first connecting part is of a cylindrical structure and is arranged at one end of the first connecting part, the size of the limiting part is larger than that of the first connecting part, a mounting hole is formed in the cover plate body in a penetrating mode along the thickness direction of the cover plate body, the limiting part is arranged on one side face, away from the battery cell, of the cover plate body, the first connecting part is inserted in the mounting hole, the battery cell comprises a positive electrode lug and a negative electrode lug, and the negative electrode lug is electrically connected with the first connecting part, the positive lug is electrically connected with the cover plate body or the shell, and the cover plate body is bonded with the connecting piece through an insulating adhesive layer.
As a preferred technical solution of the lithium ion battery, the cover plate body is a metal plate, the cover plate body is made of the same material as the shell, and the positive tab is electrically connected to the cover plate body.
As a preferable technical solution of the lithium ion battery, an installation groove is concavely provided on the outer surface of the cover plate body and on the peripheral portion of the installation hole, and the limiting portion is provided in the installation groove.
As a preferred technical scheme of the lithium ion battery, the insulation adhesive layer includes a first insulation adhesive layer, and the first insulation adhesive layer is bonded between the limiting portion and the bottom of the mounting groove.
As a preferable technical solution of the lithium ion battery, the insulating adhesive layer includes a second insulating adhesive layer, and the second insulating adhesive layer is bonded between the first connecting portion and the inner side wall of the mounting hole.
As a preferable technical solution of the lithium ion battery, a depth of the mounting groove is greater than or equal to a sum of thicknesses of the first insulating glue layer and the limiting portion.
As an optimal technical scheme of the lithium ion battery, the bottom of the mounting groove, the inner side wall of the mounting hole, the limiting portion, one side face bonded with the insulating adhesive layer and one side face bonded with the insulating adhesive layer are all concavely provided with a containing groove, and the insulating adhesive layer is contained in the containing groove.
As a preferred technical scheme of lithium ion battery, the bottom of mounting groove the inside wall of mounting hole spacing portion with the side that the insulating glue layer bonded and first connecting portion with the side that the insulating glue layer bonded all is provided with wave structure, wave structure is including convex arc portion and concave arc portion, convex arc portion with concave arc portion cross connection, adjacent two convex arc portion is formed with the holding tank.
As a preferred technical solution of the lithium ion battery, a positioning step is annularly arranged on a side surface of the cover plate body in the thickness direction, the positioning step includes a first step surface and a second step surface vertically connected to the first step surface, the second step surface is located at an upper end of the first step surface, the first step surface abuts against an inner side wall of the housing, and the second step surface abuts against an opening end of the housing.
As a preferred technical solution of the lithium ion battery, the battery cell includes a positive plate, a diaphragm and a negative plate, and the battery cell is formed by sequentially stacking and winding the negative plate, the diaphragm and the positive plate, or the battery cell is formed by sequentially stacking the negative plate, the diaphragm and the positive plate.
The invention has the beneficial effects that: the connecting piece includes spacing portion and first connecting portion, and first connecting portion are the cylinder structure, and the size of spacing portion is greater than the size of first connecting portion, is different from the structure of the connecting piece in the traditional battery, and first connecting portion can be pegged graft in the mounting hole and be connected with the negative pole ear, can reduce the space that the connecting piece occupied and hold intracavity portion, and the increase holds the space utilization in chamber, is favorable to reducing the battery size. The cover plate body is connected with the connecting piece through the connecting piece, the insulating glue layer is bonded between the cover plate body and the connecting piece, the insulating glue layer has good electrical insulating performance and has the characteristic of high viscosity at normal temperature, the cover plate body is insulated from the connecting piece, the insulating glue layer is bonded with the connecting piece and the cover plate body at the same time, the risk that the connecting piece is separated from a mounting hole due to increase of air pressure inside a battery is avoided, and the risk that liquid leakage of the battery is caused due to the existence of gaps between the connecting piece and the cover plate body is avoided.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic perspective view of a lithium ion battery according to an embodiment.
Fig. 2 is an exploded structural view of a lithium ion battery according to an embodiment.
Fig. 3 is a cross-sectional view of a lithium ion battery according to an embodiment.
Fig. 4 is a schematic structural view of a connector according to another embodiment.
Fig. 5 is a cross-sectional view of another embodiment of a lithium ion battery.
In the figure:
1. a housing; 2. a cover plate assembly; 21. a connecting member; 211. a limiting part; 212. a first connection portion; 22. a cover plate body; 23. mounting grooves; 24. a blocking member; 25. a liquid injection hole; 26. a first step surface; 27. an insulating glue layer; 271. a first insulating glue layer; 272. a second insulating glue layer; 28. mounting holes; 29. a second step surface; 3. an electric core; 31. a positive tab; 32. a negative tab; 33. a second connecting portion; 34. a third connecting portion; 35. a negative plate; 36. a diaphragm; 37. a positive plate; 4. a first insulating plate; 41. electrolyte circulation holes; 5. a second insulating plate; 6. a convex arc portion; 7. a concave arc portion; 8. and (6) accommodating the tank.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably 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 specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1 to 5, the present invention provides a lithium ion battery, which includes a battery cell 3, a casing 1 and a cover plate assembly 2, where the casing 1 has a containing cavity with one open end and the other closed end, and the battery cell 3 is disposed in the containing cavity. The cover plate assembly 2 comprises a cover plate body 22 and a connecting piece 21 arranged on the cover plate body 22, the connecting piece 21 is of a T-shaped structure, and the connecting piece 21 comprises a limiting portion 211 and a first connecting portion 212 connected with the limiting portion 211. First connecting portion 212 is the cylinder structure, spacing portion 211 sets up the one end of first connecting portion 212, just spacing portion 211's size is greater than first connecting portion 212's size. The utility model discloses a battery cover plate, including apron body 22, spacing portion 211, first connecting portion 212, first connecting portion 31 and negative pole ear 32, first connecting portion 212 is pegged graft in the mounting hole 28, electric core 3 is including positive ear 31 and negative pole ear 32, negative pole ear 32 with first connecting portion 212 electricity is connected, positive ear 31 with apron body 22 or casing 1 electricity are connected, apron body 22 with it has insulating glue layer 27 to bond between the connecting piece 21. Specifically, the material of the connecting member 21 is nickel.
Connecting piece 21 includes spacing portion 211 and first connecting portion 212, first connecting portion 212 is the cylindrical structure, and the size of spacing portion 211 is greater than the size of first connecting portion 212, is different from the structure of connecting piece 21 in the traditional battery, first connecting portion 212 in this application is pegged graft in mounting hole 28 and is connected with negative pole ear 32, can reduce connecting piece 21 and occupy the space that holds intracavity portion, the increase holds the space utilization in chamber, be favorable to dwindling the battery size. It has insulating glue film 27 to bond between apron body 22 and the connecting piece 21, and insulating glue has good electrical insulation performance and has the high viscosity characteristics at normal atmospheric temperature, has both guaranteed that apron body 22 is insulating with connecting piece 21, has guaranteed insulating glue film 27 again and has bonded with connecting piece 21 and apron body 22 simultaneously, avoids the inside atmospheric pressure of battery to increase and leads to the risk that connecting piece 21 breaks away from in the mounting hole 28 to avoided having the gap and lead to the risk of battery weeping between connecting piece 21 and apron body 22.
In this embodiment, the cover plate body 22 is a metal plate, the cover plate body 22 is made of the same material as that of the casing 1, the positive tab 31 is electrically connected to the cover plate body 22, and the cover plate body 22 is made of the same material as that of the casing 1, so that the positive tab 31 is electrically connected to the cover plate body 22, and the casing 1 and the cover plate body 22 can both be positive connection terminals of the lithium ion battery. Specifically, the cover plate body 22 and the housing 1 are both made of aluminum.
In order to avoid the protrusion of the connecting member 21 from the upper surface of the cover plate body 22, in the present embodiment, an installation groove 23 is concavely provided on the outer surface of the cover plate body 22 and on the periphery of the installation hole 28, and the limiting portion 211 is disposed in the installation groove 23.
In one embodiment, the insulation adhesive layer 27 includes a first insulation adhesive layer 271, and the first insulation adhesive layer 271 is adhered between the limiting portion 211 and the bottom of the mounting groove 23. The arrangement of the first insulation glue layer 271 ensures that the bottom installation of the limiting part 211 and the installation groove 23 has good adhesion and insulation.
In this embodiment, the depth of the mounting groove 23 is greater than or equal to the sum of the thicknesses of the first insulating adhesive layer 271 and the limiting portion 211, so that the limiting portion 211 can be prevented from protruding out of the cover plate body 22, the size of the battery can be further reduced, and the attractiveness of the battery can be improved.
In order to place the limiting portion 211 in the mounting groove 23 conveniently, the size of the limiting portion 211 is smaller than that of the mounting groove 23, and after the connecting piece 21 is mounted in place, a gap is formed between the limiting portion 211 and the inner side wall of the mounting groove 23.
Improve the bonding strength of first insulation glue film 271 between the bottom of spacing portion 211 and mounting groove 23, can also with first insulation glue film 271 orientation the direction of the inside wall of mounting groove 23 extends, and first insulation glue film 271 is kept away from the one end of spacing portion 211 bonds with the inside wall of mounting groove 23.
In another embodiment, the insulating adhesive layer 27 includes a second insulating adhesive layer 272, and the second insulating adhesive layer 272 is adhered between the first connecting portion 212 and the inner sidewall of the mounting hole 28. The second insulating adhesive layer 272 ensures adhesion and insulation between the inner sidewall of the adhesive mounting hole 28 and the first connecting portion 212. Specifically, the first insulating adhesive layer 271 and the second insulating adhesive layer 272 are integrally formed.
As a preferred embodiment, a third insulating adhesive layer (not shown in the figure) is disposed on the upper surface of the first insulating adhesive layer 271 and located between the limiting portion 211 and the inner side wall of the mounting groove 23, and the upper surface of the third insulating adhesive layer is flush with the upper surface of the limiting portion 211, or the upper surface of the third insulating adhesive layer is flush with the upper surface of the cover plate body 22, or the upper surface of the third insulating adhesive layer is flush with the upper surface of the limiting portion 211 and the upper surface of the cover plate body 22 at the same time.
In this embodiment, the bottom of mounting groove 23 the inside wall of mounting hole 28 spacing portion 211 with a side that insulating glue layer 27 bonded and first connecting portion 212 with a side that insulating glue layer 27 bonded all is concave to be equipped with holding tank 8, hold in holding tank 8 insulating glue layer 27, the inside wall of accessible holding tank 8 increases the bonding area of insulating glue layer 27 and connecting piece 21 and apron body 22.
An embodiment, the bottom of mounting groove 23 the inside wall of mounting hole 28 spacing portion 211 with a side that insulating glue layer 27 bonded and first connecting portion 212 with a side that insulating glue layer 27 bonded all is provided with wave structure, wave structure is including convex arc portion 6 and concave arc portion 7, convex arc portion 6 with concave arc portion 7 cross-connects, adjacent two convex arc portion 6 is formed with holding tank 8. Specifically, in this embodiment, the convex arc portions 6 are all arranged to protrude toward the direction facing the insulating adhesive layer 27, and the concave arc portions 7 are all arranged to be concave toward the direction facing away from the insulating adhesive layer 27. Because the wave structure includes because convex arc portion 6 and concave arc portion 7, to a great extent has increased the bonding area between insulating glue layer 27 and connecting piece 21 and the apron body 22, has improved the joint strength between connecting piece 21 and the apron body 22.
In another embodiment, a groove may be directly formed at the bottom of the mounting groove 23, the inner sidewall of the mounting hole 28, a side surface of the limiting portion 211 bonded to the insulating adhesive layer 27, and a side surface of the first connecting portion 212 bonded to the insulating adhesive layer 27 to serve as the receiving groove 8.
Of course, in other embodiments, the bottom of the mounting groove 23, the inner sidewall of the mounting hole 28, one side of the limiting portion 211 bonded to the insulating adhesive layer 27, and one side of the first connecting portion 212 bonded to the insulating adhesive layer 27 may be set to be planar structures, and in specific operation, the shape and structure of the bottom of the mounting groove 23, the inner sidewall of the mounting hole 28, one side of the limiting portion 211 bonded to the insulating adhesive layer 27, and one side of the first connecting portion 212 bonded to the insulating adhesive layer 27 may be flexibly designed according to actual needs.
In this embodiment, the thickness of the position where the second connection portion 33 is welded to the first connection portion 212 is greater than the thickness of the remaining positions of the second connection portion, so as to form a reinforced portion. The reinforcement is provided to prevent the negative electrode tab 32 from being damaged when the negative electrode tab 32 is welded to the first connector 21, mainly to increase the thickness of the welded portion between the negative electrode tab 32 and the first connector 212.
The side of apron body 22 in its thickness direction encircles and is equipped with the location step, the location step include first step face 26 with the second step face 29 of first step face 26 vertical connection, second step face 29 is located the upper end of first step face 26, first step face 26 with the inside wall butt of casing 1, second step face 29 butt is in the open end of casing 1. Because the second step surface 29 abuts against the opening end of the shell 1, when the lithium ion battery is assembled, the cover plate body 22 can be positioned at the opening end, the assembly is convenient, and because the first step surface 26 abuts against the inner side wall of the shell 1, the connection area of the cover plate body 22 and the shell 1 can be increased.
In this embodiment, the cover plate body 22 is provided with a liquid injection hole 25 extending through the thickness direction thereof, and the liquid injection hole 25 is blocked by a blocking member 24. During specific operation, electrolyte can be injected into the accommodating cavity through the electrolyte injection hole 25, and after the electrolyte injection is finished, the electrolyte injection hole 25 is plugged through the plugging piece 24 to prevent leakage.
In an embodiment, a first insulating plate 4 and a second insulating plate 5 are respectively disposed between the battery cell 3 and the cover plate body 22 and between the battery cell 3 and the bottom of the casing 1, the first insulating plate 4 is provided with at least two electrolyte circulation holes 41 along a thickness direction thereof, and all the electrolyte circulation holes 41 are distributed at intervals. Set up electrolyte circulation hole 41 on first insulating plate 4, after annotating liquid hole 25 and pour into electrolyte, accessible electrolyte circulation hole 41 flows to electric core 3, is favorable to electric core 3 infiltration electrolyte. Set up second insulation board 5 between the bottom of electric core 3 and casing 1, avoid the bottom direct contact of electric core 3 and casing 1, prevent electric core 3 short circuit.
In one embodiment, the positive tab 31 and the negative tab 32 are respectively led out from the same end of the battery cell 3, and the positive tab 31 and the negative tab 32 are respectively connected to the cover plate assembly 2 after passing through the first insulating plate 4. In order to facilitate the positive tab 31 and the negative tab 32 to penetrate through the first insulating plate 4, an avoiding hole (not shown in the figure) may be respectively formed in the first insulating plate 4, and the positive tab 31 and the negative tab 32 penetrate through the avoiding hole to be connected with the cover plate assembly 2.
In another embodiment, the positive electrode tabs 31 may be led out from the opposite ends of the battery cell 3 respectively from the negative electrode tabs 32 and the battery cell 3. Preferably, the negative tab 32 is led out from the upper end of the battery cell 3, and the positive tab 31 is led out from the lower end of the battery cell 3. The negative electrode tab 32 is connected to the first connection portion 212 through the first insulating plate 4, and the positive electrode is electrically connected to the bottom of the case 1 through the second insulating plate 5. The first insulating plate 4 and the second insulating plate 5 are respectively provided with an avoidance hole corresponding to the negative tab 32 and the positive tab 31, and the negative tab 32 and the positive tab 31 penetrate through the corresponding avoidance holes to be respectively electrically connected with the first connecting portion 212 and the housing 1.
In actual design, positive tab 31 and negative tab 32 may be drawn from any position of cell 3, as long as negative tab 32 is electrically connected to first connection portion 212 and positive tab 31 is electrically connected to cover plate body 22 or case 1.
The battery cell 3 comprises a positive plate 37, a diaphragm 36 and a negative plate 35, the positive tab 31 is connected with the positive plate 37, and the negative tab 32 is connected with the negative plate 35.
In an embodiment, the battery cell 3 is formed by sequentially stacking and winding the negative electrode sheet 35, the separator 36, and the positive electrode sheet 37, and the battery cell 3 with such a structure is a winding battery cell 3.
In another embodiment, the battery cell 3 or the battery cell 3 is formed by sequentially stacking the negative electrode sheet 35, the separator 36 and the positive electrode sheet 37, and the battery cell 3 with such a structure is a laminated battery cell 3.
In this embodiment, the housing 1 is a cylinder structure, and the cross section of the cover plate body 22 is circular. In general, the welding area of the cover plate body 22 is small (the diameter of the cover plate body 22 is generally 8mm to 10mm), and when the negative electrode tab 32 is positioned, the connecting member 21 may be arranged offset from the axial line of the casing 1 to avoid short circuit of the battery cell 3 caused by contact between the negative electrode tab 32 and the connecting member 21.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A lithium ion battery is characterized by comprising an electric core, a shell and a cover plate assembly, wherein the shell is provided with a containing cavity with an opening at one end and a closed end at the other end, the electric core is arranged in the containing cavity, the cover plate assembly comprises a cover plate body and a connecting piece arranged on the cover plate body, the connecting piece is of a T-shaped structure and comprises a limiting part and a first connecting part connected with the limiting part, the first connecting part is of a cylindrical structure and is arranged at one end of the first connecting part, the size of the limiting part is larger than that of the first connecting part, a mounting hole is formed in the cover plate body in a penetrating manner along the thickness direction of the cover plate body, the limiting part is arranged on one side surface of the cover plate body, which is far away from the electric core, the first connecting part is inserted in the mounting hole, and the electric core comprises a positive electrode lug and a negative, the negative pole ear is electrically connected with the first connecting part, the positive pole ear is electrically connected with the cover plate body or the shell, and an insulating glue layer is bonded between the cover plate body and the connecting piece.
2. The lithium ion battery of claim 1, wherein the cover plate body is a metal plate, the cover plate body is made of the same material as the housing, and the positive tab is electrically connected to the cover plate body.
3. The lithium ion battery of claim 1, wherein a mounting groove is concavely formed on the outer surface of the cover plate body and on the periphery of the mounting hole, and the limiting portion is disposed in the mounting groove.
4. The lithium ion battery of claim 3, wherein the insulation adhesive layer comprises a first insulation adhesive layer, and the first insulation adhesive layer is bonded between the limiting portion and the bottom of the mounting groove.
5. The lithium ion battery of claim 4, wherein the insulating glue layer comprises a second insulating glue layer, and the second insulating glue layer is adhered between the first connecting portion and the inner side wall of the mounting hole.
6. The lithium ion battery of claim 4, wherein the depth of the mounting groove is greater than or equal to the sum of the thicknesses of the first insulation glue layer and the limiting part.
7. The lithium ion battery of claim 5, wherein a bottom of the mounting groove, an inner side wall of the mounting hole, a side surface of the limiting portion bonded to the insulating adhesive layer, and a side surface of the first connecting portion bonded to the insulating adhesive layer are all concavely provided with accommodating grooves, and the insulating adhesive layer is accommodated in the accommodating grooves.
8. The lithium ion battery of claim 7, wherein the bottom of the mounting groove, the inner side wall of the mounting hole, one side surface of the limiting portion bonded to the insulating adhesive layer, and one side surface of the first connecting portion bonded to the insulating adhesive layer are all provided with a wave structure, the wave structure comprises convex arc portions and concave arc portions, the convex arc portions and the concave arc portions are sequentially connected in a staggered manner, and the accommodating groove is formed between every two adjacent convex arc portions.
9. The lithium ion battery of claim 1, wherein the cover plate body is provided with a positioning step around a side surface in a thickness direction thereof, the positioning step includes a first step surface and a second step surface vertically connected to the first step surface, the second step surface is located at an upper end of the first step surface, the first step surface abuts against an inner side wall of the casing, and the second step surface abuts against an opening end of the casing.
10. The lithium ion battery of any one of claims 1 to 9, wherein the cell comprises a positive plate, a diaphragm and a negative plate, and the cell is formed by stacking and winding the negative plate, the diaphragm and the positive plate in sequence, or the cell is formed by stacking the negative plate, the diaphragm and the positive plate in sequence.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010289768.0A CN111370601A (en) | 2020-04-14 | 2020-04-14 | Lithium ion battery |
| PCT/CN2020/086346 WO2021208127A1 (en) | 2020-04-14 | 2020-04-23 | Lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010289768.0A CN111370601A (en) | 2020-04-14 | 2020-04-14 | Lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111370601A true CN111370601A (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010289768.0A Pending CN111370601A (en) | 2020-04-14 | 2020-04-14 | Lithium ion battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111370601A (en) |
| WO (1) | WO2021208127A1 (en) |
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| CN113363677A (en) * | 2021-04-30 | 2021-09-07 | 蜂巢能源科技(无锡)有限公司 | Lithium battery and preparation method thereof |
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| CN114284570A (en) * | 2021-12-28 | 2022-04-05 | 宁德新能源科技有限公司 | Battery cell, battery and electric equipment |
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| JPH09129197A (en) * | 1995-10-31 | 1997-05-16 | Matsushita Electric Ind Co Ltd | Sealed battery |
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| CN101662043B (en) * | 2008-08-27 | 2013-03-13 | 深圳市比克电池有限公司 | Lithium ion battery |
| CN101867049B (en) * | 2010-06-17 | 2013-01-23 | 惠州亿纬锂能股份有限公司 | Lithium battery |
| CN106549119A (en) * | 2015-09-18 | 2017-03-29 | 天津邦利化工科技有限公司 | New type of safe column type lithium cell negative cover |
| CN107732042B (en) * | 2017-09-26 | 2021-02-05 | 惠州市亿纬新能源研究院 | Nut cap and lithium battery comprising same |
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- 2020-04-23 WO PCT/CN2020/086346 patent/WO2021208127A1/en active Application Filing
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