CN111261928A - Soft package button type lithium ion battery cell assembly and button battery - Google Patents
Soft package button type lithium ion battery cell assembly and button battery Download PDFInfo
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- CN111261928A CN111261928A CN202010247626.8A CN202010247626A CN111261928A CN 111261928 A CN111261928 A CN 111261928A CN 202010247626 A CN202010247626 A CN 202010247626A CN 111261928 A CN111261928 A CN 111261928A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 51
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 239000002985 plastic film Substances 0.000 claims description 23
- 229920006255 plastic film Polymers 0.000 claims description 23
- 239000002775 capsule Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 3
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 3
- 239000003575 carbonaceous material Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002102 lithium manganese oxide Inorganic materials 0.000 claims description 2
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 8
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 10
- 239000008358 core component Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009461 vacuum packaging Methods 0.000 description 2
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012793 heat-sealing layer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
-
- 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
- H01M50/538—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
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a soft-package button type battery core assembly for a lithium ion battery, which comprises: the positive plate, the negative plate, the positive tab, the negative tab and the diaphragm; the positive plate and the negative plate are laminated and then wound into a cylindrical battery cell, and the diaphragm is arranged between the positive plate and the negative plate; the cylindrical battery cell is provided with a bottom surface, a top surface and a side surface, and the positive lug is led out from a first position on the top surface and extends towards a first preset direction relative to the cylindrical battery cell; the negative electrode lug is led out from a second position on the top surface and extends towards a second preset direction relative to the cylindrical battery cell; the first position and the second position are spaced by a needle rolling position, and the first preset direction is parallel to and opposite to the second preset direction. Above-mentioned electric core subassembly is at battery during operation, can disperse the focus of electric current to the positive and negative two sides of electric core or front and back both sides, is favorable to battery heat dissipation and stable cycle performance.
Description
Technical Field
The application relates to the technical field of soft package button cells, in particular to a cell assembly for a soft package button lithium ion battery and a button cell.
Background
The soft package button lithium ion battery is a button lithium battery with a battery shell formed by aluminum plastic films and heat-sealed, is different from a steel shell lithium ion battery, and has the main difference of a soft package shell. The button cell is also called as a button cell, wherein one main purpose of the soft-package button lithium ion battery is to supply power for Bluetooth mobile equipment, and electrodes used in a battery cell of the soft-package button lithium ion battery comprise a pole piece and a pole lug; the tab is a metal conductor connecting the pole piece and leading out the positive and negative electrodes from the battery core, and in popular terms, the tab is a contact point when the battery is charged and discharged. At present, positive and negative electrode lugs of a soft-package button type lithium ion battery are usually led out from the similar positions of a battery cell, so that the directions of the electrode lugs are conveniently controlled in the process of winding a pole piece into the battery cell, and the positive and negative electrode lugs are distributed on the same side of the battery cell and extend outwards in the same direction. However, the tabs distributed on the same side lead to poor heat dissipation performance of the soft-packaged button lithium ion battery, and particularly, when a large current is discharged, heat is concentrated in a local area of the battery cell, which is not beneficial to the service life of the battery and the maintenance of stable cycle performance.
Disclosure of Invention
The invention provides a cell assembly for a soft-package button type lithium ion battery and the button type lithium ion battery, which are used for solving or partially solving the technical problem that the heat dissipation and the cycle performance of the battery are influenced because positive and negative lugs of the existing soft-package button type lithium ion battery are distributed on the same side of the cell and extend in the same direction.
In order to solve the technical problem, the invention provides a soft-package button type battery core assembly for a lithium ion battery, which comprises: the positive plate, the negative plate, the positive tab, the negative tab and the diaphragm;
the positive plate and the negative plate are laminated and then wound into a cylindrical battery cell, and the diaphragm is arranged between the positive plate and the negative plate; the positive tab is fixedly connected to the positive plate, and the negative tab is fixedly connected to the negative plate;
the cylindrical battery cell is provided with a bottom surface, a top surface and a side surface, and the positive lug is led out from a first position on the top surface and extends towards a first preset direction relative to the cylindrical battery cell; the negative electrode lug is led out from a second position on the top surface and extends towards a second preset direction relative to the cylindrical battery cell; the first position and the second position are spaced by a needle rolling position, and the first preset direction is parallel to and opposite to the second preset direction.
Optionally, the bottom or top surface is in the axial cross-sectional shape of the capsule; the length of the bottom surface is within 20mm, and the width is smaller than the length; the height of the side surface is within 10 mm.
Optionally, the positive plate is a strip-shaped pole piece with a length of L, and the positive tab is fixedly connected to the pole piece in an area ranging from L/3 to 2L/3; the connection mode of the negative plate and the negative tab is the same as that of the positive plate and the positive tab.
Optionally, the width specification of the positive electrode tab or the negative electrode tab is 1.0 mm-2.0 mm.
Optionally, the material of the positive plate is one of lithium cobaltate, ternary lithium nickel cobalt manganese oxide and lithium manganese oxide.
Optionally, the negative electrode plate is made of one of lithium titanate, graphite and silicon carbon material.
Based on the same inventive concept of the foregoing technical solution, the present invention also provides a soft-package button lithium ion battery, including: the aluminum-plastic film shell, the electrolyte and the electric core component according to any one of the above technical schemes;
the aluminum-plastic film shell is a hollow capsule structure matched with the shape of the battery core, is sleeved on the battery core assembly in a heat sealing mode, and is filled with electrolyte;
the tab penetrates through the heat seal layer of the aluminum plastic film shell and extends to the outside of the soft-package button type lithium ion battery; the tab is also provided with tab glue.
Optionally, the positive tab and the negative tab are bent and then extend to the outside of the soft-package button-type lithium ion battery from the side of the soft-package button-type lithium ion battery through the heat seal layer.
Optionally, the nominal capacity of the soft-package button type lithium ion battery is 25 mAh-120 mAh.
Based on the same inventive concept of the foregoing technical solution, the present invention further provides an electronic device comprising the soft-pack button lithium ion battery according to claim 7.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a cell assembly for a soft-package button type lithium ion battery, which is characterized in that a positive electrode lug and a negative electrode lug are distributed on the front side or the back side or the front side and the back side of the battery cell and extend outwards in the reverse direction by controlling the leading-out position and the extending direction of the electrode lug on the battery cell. The electric core component with the structure can disperse the current concentration points to the positive and negative surfaces or the front and back sides of the electric core when the button cell works, can not lead to the concentrated production of overheating of the battery at a certain area current, and is favorable for the heat dissipation and the stable circulation performance of the battery.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic view showing that tabs are led out from two opposite sides of an electric core assembly according to one embodiment of the present invention;
fig. 2 shows a right side view of the tab from two opposite sides of the electric core assembly according to one embodiment of the present invention;
fig. 3 shows a schematic diagram of a tab of a soft-package button type lithium ion battery led out from the same side according to an embodiment of the invention;
fig. 4 shows a schematic view of a tab attached to a central region of a pole piece according to one embodiment of the invention;
fig. 5 shows a top view of a soft pack button lithium ion battery according to one embodiment of the invention;
fig. 6 shows a left side view of a soft pack button lithium ion battery according to one embodiment of the invention;
fig. 7 shows a front view of a soft pack button lithium ion battery according to one embodiment of the invention;
description of reference numerals:
1. an electrical core assembly; 11. a positive plate; 12. a negative plate; 13. a diaphragm; 14. a positive tab; 15. a negative tab; 16. gluing a tab; 2. needle rolling positions; 3. an aluminum plastic film shell; 4. and (4) heat sealing the layer.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
In order to solve the technical problems that the heat dissipation of the battery is affected by the fact that the positive and negative electrode lugs of the current soft-package button type lithium ion battery are distributed on the same side of the battery core and extend in the same direction, and particularly, when heavy current discharges, the heat is concentrated in the local area of the battery core to affect the service life and the cycle performance of the battery, in an optional embodiment, as shown in fig. 1 to 2, a battery assembly 1 for the soft-package button type lithium ion battery is disclosed, and comprises: positive plate 11, negative plate 12, positive tab 14, negative tab 15 and diaphragm 13; the positive plate 11 and the negative plate 12 are laminated and then wound into a cylindrical battery cell, and the diaphragm 13 is arranged between the positive plate 11 and the negative plate 12; the positive tab 14 is fixedly connected to the positive plate 11, and the negative tab 15 is fixedly connected to the negative plate 12; the cylindrical battery cell is provided with a bottom surface, a top surface and a side surface, and the positive tab 14 is led out from a first position on the top surface and extends towards a first preset direction relative to the cylindrical battery cell; the negative electrode tab 15 is led out from a second position on the top surface and extends towards a second preset direction relative to the cylindrical battery cell; the needle rolling position 2 is arranged between the first position and the second position at intervals, and the first preset direction is parallel to and opposite to the second preset direction.
Specifically, a tab leading-out manner commonly used at present is shown in fig. 3, where a positive tab and a negative tab are led out from a position close to the top surface of a battery cell and extend outward from the same side of the battery cell. This necessarily results in the current and heat being concentrated in localized areas of the cell as the electrodes are discharged. In the core assembly 1 provided in this embodiment, by controlling the connection position and the leading-out direction of the tab on the winding core, the distance between the leading-out positions of the positive tab 14 and the negative tab 15 on the top surface of the core is increased, that is, the linear distance between the first position and the second position is increased; on the other hand, the positive tab 14 and the negative tab 15 extend outward in opposite directions relative to the battery cell, that is, the positive tab and the negative tab extend outward in opposite directions relative to the front side and the back side or the front side and the back side of the battery cell, so that the positive tab and the negative tab are distributed on the front side and the back side of the battery cell, and thus, a current concentration point during discharging is not in a local area of the battery. Alternatively, the positive tab 14 is welded to the positive tab 11 and the negative tab 15 is welded to the negative tab 12.
The battery core provided by the embodiment is manufactured, the required orientation of the tab needs to be set during tab spot welding, the leading-out direction of the exposed end of the tab is specified, and then in the process of winding the battery core, the leading-out positions of the anode tab 14 and the cathode tab 15 on the top surface of the wound battery core assembly 1 are controlled, so that the tab is distributed on the front side and the back side or the front side and the back side of the battery core assembly 1 during winding. In an alternative mode, as shown in fig. 1, when winding the pole piece, the positive electrode is defined to face left, and the negative electrode is defined to face right, so that the positive electrode and the negative electrode are respectively located at the upper side and the lower side of the deformed winding needle position 2 (or winding needle hole), and respectively extend outwards from the front side and the back side of the battery cell.
Optionally, the electric core assembly 1 provided in this embodiment is in a shape of a pharmaceutical capsule, that is, the bottom surface or the top surface of the electric core assembly 1 is in an axial cross-sectional shape of the capsule; the length of the bottom surface is within 20mm, and the width is smaller than the length; the height of the side surface is within 10 mm.
Winding the electric core into a capsule shape is to increase the structural diversity of the button cell finally manufactured so as to adapt to the shape and endurance requirements of the bluetooth mobile device which is continuously developed, in this embodiment, as shown in fig. 1, the electric core assembly 1 is a cylindrical electric core shaped like a medicine capsule, specifically, the cylindrical electric core has a bottom surface, a top surface and a side surface, wherein the bottom surface or the top surface is in the shape of an axial section of the capsule (that is, the rectangle and the rectangle are connected in an arc shape in the width direction and are in an annular shape like a runway), and the side surface has a certain height. The capsule axial direction here means a direction parallel to the capsule long axis. And in the winding process, the positive plate 11 and the negative plate 12 are always separated by the diaphragm 13, and the middle part of the columnar battery core is a deformed winding needle position 2 space. The cylindrical battery core is used for carrying out the manufacturing processes of the button cell such as heat sealing, liquid injection and formation, the capsule-shaped soft package button lithium ion battery with the appearance similar to that of a common medicine capsule can be finally obtained, the shape requirement of continuously developed Bluetooth mobile equipment (such as a Bluetooth earphone) on the battery can be met, and the equivalent electric storage quantity of the button cell with the common cylindrical specification can also be provided.
Optionally, the total length of the bottom surface of the capsule-shaped battery cell is 5-20 mm; the optional width range is 5-20 mm, and the preferred width range is 5-10 mm; optional height scope is 2.5 ~ 10mm, and preferred height scope is 2.5mm ~ 5mm, so, can adapt to the shape and size of different bluetooth mobile devices, can provide sufficient electric quantity storage for the bluetooth mobile device again.
On the other hand, research shows that after the capsule-shaped cylindrical battery cell is manufactured into a finished button battery product, the internal resistance of the capsule-shaped cylindrical battery cell is also larger than that of a conventional cylindrical button battery, so that the battery generates heat more remarkably in a large-current discharge state.
Optionally, the material of the positive plate 11 is lithium cobaltate (LiCoO)2) And ternary lithium nickel cobalt manganese oxide (LiNi)1-x-yCoxMnyO2Wherein x + y<1) Lithium manganate (LiMn)2O4) One of (1); optionally, the negative electrode plate 12 is made of one of lithium titanate, graphite and silicon carbon material; optionally, the material of the diaphragm 13 is one of polyethylene, polypropylene, and a coating diaphragm.
Optionally, the width of the positive tab 14 or the negative tab 15 is 1.0mm to 2.0 mm.
Because the connection position or the leading-out position of the pole lugs in the electrode assembly is adjusted, the structure and the related size of the pole pieces need to be correspondingly adjusted when the battery cell is manufactured, and the purpose of mutually matching the sizes of the positive pole piece and the negative pole piece is achieved; after the positive and negative pole pieces 12 and the diaphragm 13 are wound into the cell, the positive tab 14 and the negative tab 15 are both led out from the top surface of the cell assembly 1, so that the tab needs to be bent, fixed and positioned after the battery is wound so as to be installed in the aluminum plastic film shell 3 for heat sealing and packaging, and an optional bending mode is to bend the tab for 90 degrees three times and extend horizontally outwards from the side surface of the wound cell.
Specifically, the following method can be adopted to manufacture the electric core assembly provided by the embodiment:
s1: stacking the positive electrode sheet 11, the separator 13, and the negative electrode sheet 12 in this order;
s2: winding the positive plate 11, the diaphragm 13 and the negative plate 12 on a cylindrical winding needle with the diameter larger than 3.0mm to obtain a cylindrical winding core;
s3: and (4) performing flat pressing and shaping on the winding core to obtain the electric core component 1.
Specifically, the above method is to wind the stacked positive electrode sheet 11, separator 13, and negative electrode sheet 12 into a standard cylindrical winding core by using a cylindrical winding needle having a large diameter on a winding machine, and then to flat-press the circular winding core by using a hot flat press having a customized structure to form a capsule-type core assembly. The cylindrical winding needle with the diameter larger than 3.0mm is used for leaving a large enough winding needle position 2 space in the cylindrical winding core so as to enable the cylindrical winding core to be smoothly deformed into a capsule shape when flat pressing and shaping are carried out conveniently.
This embodiment provides a soft packet of knot formula battery core subassembly for lithium ion battery, through leading-out position and extending direction of control utmost point ear on electric core, makes anodal ear and negative pole ear distribute in the positive and negative or front and back both sides of electric core, and the reverse outside extension. The electric core component with the structure can disperse current concentration points to the front and back surfaces or the front and back sides of the electric core when the button cell works, so that the battery cannot be overheated due to current concentration in a certain area, and the heat dissipation and the stable cycle performance of the battery are facilitated; on the other hand, the capsule-shaped electric core component expands the shape requirement of the developing Bluetooth mobile equipment (such as a Bluetooth headset) on the battery, and can provide the cruising ability equivalent to that of a button battery with a common cylindrical specification.
In order to further improve the heat dissipation and cycle performance of the battery in the high-current discharge state after the capsule-shaped battery core in the above embodiment is manufactured into the soft-package button battery. Based on the same inventive concept of the previous embodiment, in another alternative embodiment, as shown in fig. 4, the positive plate 11 of the cell assembly 1 is a strip-shaped pole piece with a length L, and the positive tab 14 is fixedly connected to the pole piece in the range of L/3 to 2L/3; negative electrode tab 12 and negative electrode tab 15 are connected in the same manner as positive electrode tab 11 and positive electrode tab 14.
The electrode assembly provided by the embodiment is used for reducing the internal resistance of the capsule-shaped soft-package button type lithium ion battery, so that the purpose of reducing the heat generation of the battery is achieved. In order to facilitate manufacturing of the conventional battery core of the button battery, a tab is connected to the edge area of the end part of the pole piece. However, research shows that the transmission path of electrons in the pole pieces is increased significantly, and therefore the specific connection position of the tab on the corresponding pole piece significantly affects the ohmic internal resistance of the soft-package button-type lithium ion battery. In the present embodiment, the tab is connected to the middle region of the corresponding pole piece, as shown in fig. 1, the pole piece is a strip-shaped pole piece with a length of L before winding; the connection position of the pole lug is in an area which is L/3-2L/3 away from one end of the pole piece. Therefore, the electronic transmission path in the discharging process can be shortened, meanwhile, as the lug is connected to the middle area, the electronic transmission is simultaneously carried out on two sides of the lug, and compared with the lug which is connected to the end part of the pole piece and is in single-side electronic transmission, the electronic transmission path is also increased, so that the ohmic resistance in a battery loop can be obviously reduced. Experimental data show that by adopting the electrode structure, the ohmic internal resistance of the soft-package button type lithium ion battery can be reduced by 75 percent, which is equivalent to one fourth of the scheme of connecting a tab to the end part of a pole piece originally, and the discharge rate of the soft-package button type lithium ion battery is remarkably improved; meanwhile, the heat emission of the button cell is reduced, the charge and discharge efficiency of the cell is improved, and the service life of the cell is prolonged. Preferably, the pole lug is connected to the middle position of the corresponding pole piece in the length direction, namely the pole lug is fixedly connected to the L/2 position of the pole piece, and the effects of reducing internal resistance and improving discharge rate are optimal.
In the above group of embodiments, the electric core assembly in the form of capsule is described, and based on the same inventive concept, in other alternative embodiments, as shown in fig. 5 to 7, there is provided a soft-packing button type lithium ion battery, including: an aluminum plastic film shell 3, electrolyte and any one of the above-mentioned embodiments of the core assembly 1;
the aluminum-plastic film shell 3 is a hollow capsule structure matched with the shape of the battery core, is sleeved on the battery core assembly 1 in a heat sealing mode, and is filled with electrolyte; the tab penetrates through the heat seal layer 4 of the aluminum plastic film shell 3 and extends to the outside of the soft-package button type lithium ion battery; the tab is also provided with tab glue 16.
Optionally, the positive tab 14 and the negative tab 15 extend from the side surface of the soft-package button-type lithium ion battery to the outside of the soft-package button-type lithium ion battery through the heat seal layer 4 after being bent.
Optionally, the nominal capacity of the soft-package button type lithium ion battery is 25 mAh-120 mAh; optionally, the rated voltage is 3.6V to 3.8V, and specific values may be 3.6V, 3.7V and 3.8V.
The capsule-shaped soft-package button lithium ion battery provided in the embodiment can be prepared by the following method:
s4: punching the aluminum-plastic film into a capsule-shaped hollow shell matched with the shape of the battery cell to obtain an aluminum-plastic film shell 3;
s5: placing the battery core in an aluminum plastic film shell 3 for heat sealing molding to obtain a preformed product of the button cell in a capsule shape;
s6: and sequentially carrying out liquid injection, formation, vacuum packaging, activation, trimming and edge folding on the button cell preform to obtain the button cell.
Specifically, S4 is a procedure for molding the aluminum-plastic film, and the customized capsule-type mold is used to punch the aluminum-plastic film into the capsule-type casing with the predetermined specification. The plastic-aluminum film is also called as a punching pit, and a Pocket capable of being filled into a capsule-shaped battery cell is formed after cutting and forming. Optionally, double pits are punched when the aluminum-plastic film is punched, so that the phenomenon that the deformation amount is too large due to punching of a single pit is avoided, and the aluminum-plastic film shell is broken due to the fact that the deformation limit of the aluminum-plastic film is broken. The cell is prepared by using a double-pit punched aluminum-plastic film shell, wherein a heat sealing layer of an aluminum-plastic film is positioned in the middle of the side edge of the capsule-shaped button cell.
S5 is a heat sealing procedure of the battery, after the capsule-shaped battery core is placed in a Pocket bag, an arc heat sealing machine matched with the capsule structure is adopted for heat sealing and forming; specifically, top sealing and side sealing are carried out, and a PP material in the tab glue is melted and bonded with a PP layer of the aluminum plastic film during packaging, so that an effective packaging structure is formed.
And then, entering the process of S6, after injecting electrolyte, forming, vacuum packaging and activating the battery, cutting the activated battery into an arc shape by using an arc edge cutter matched with the capsule structure, and then folding and forming the battery after edge cutting by using a folding machine with the shape of a capsule to finally obtain the capsule-shaped lithium ion button battery product.
Based on the same inventive concept of the foregoing embodiment, in other optional embodiments, there is further provided an electronic device, including the soft package button lithium ion battery in the foregoing technical solution. Alternatively, the electronic device may be a bluetooth mobile device, such as a bluetooth headset.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a cell assembly for a soft-package button type lithium ion battery, which is characterized in that a positive electrode lug and a negative electrode lug are distributed on the front side or the back side or the front side and the back side of the battery cell and extend outwards in the reverse direction by controlling the leading-out position and the extending direction of the electrode lug on the battery cell. The electric core component with the structure can disperse current concentration points to the front and back surfaces or the front and back sides of the electric core when the button cell works, so that the battery cannot be overheated due to current concentration in a certain area, and the heat dissipation and the stable cycle performance of the battery are facilitated;
on the other hand, the capsule-shaped electric core component expands the shape requirement of the developing Bluetooth mobile equipment (such as a Bluetooth headset) on the battery, and can provide the cruising ability equivalent to that of a button battery with a common cylindrical specification.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. The utility model provides a soft packet of knot formula battery core subassembly for lithium ion battery which characterized in that, the battery core subassembly includes: the positive plate, the negative plate, the positive tab, the negative tab and the diaphragm;
the positive plate and the negative plate are laminated and then wound into a cylindrical battery cell, and the diaphragm is arranged between the positive plate and the negative plate; the positive tab is fixedly connected to the positive plate, and the negative tab is fixedly connected to the negative plate;
the cylindrical battery cell is provided with a bottom surface, a top surface and a side surface, and the positive tab is led out from a first position on the top surface and extends towards a first preset direction relative to the cylindrical battery cell; the negative electrode tab is led out from a second position on the top surface and extends towards a second preset direction relative to the cylindrical battery cell; the first position and the second position are spaced by a needle rolling position, and the first preset direction is parallel to and opposite to the second preset direction.
2. The electric core assembly according to claim 1, wherein said bottom surface or said top surface is in the shape of an axial cross-section of a capsule; the length of the bottom surface is within 20mm, and the width of the bottom surface is smaller than the length; the height of the side surface is within 10 mm.
3. The electric core assembly according to claim 1, wherein said positive plate is a strip-shaped pole piece with a length L, and said positive tab is fixedly connected to said pole piece in a region ranging from L/3 to 2L/3; the connection mode of the negative plate and the negative tab is the same as that of the positive plate and the positive tab.
4. The current core assembly of claim 1, wherein said positive tab or said negative tab has a width dimension of 1.0mm to 2.0 mm.
5. The battery pack of claim 1, wherein the positive plate is made of one of lithium cobaltate, ternary lithium nickel cobalt manganese oxide and lithium manganese oxide.
6. The battery pack of claim 1, wherein the negative plate is made of one of lithium titanate, graphite and silicon carbon material.
7. The utility model provides a soft packet of knot formula lithium ion battery which characterized in that includes: an aluminum plastic film shell, an electrolyte and the electric core assembly of any one of claims 1 to 6;
the aluminum-plastic film shell is of a hollow capsule structure matched with the shape of the battery cell, is sleeved on the battery cell assembly in a heat sealing mode, and is filled with the electrolyte;
the tab penetrates through the heat seal layer of the aluminum plastic film shell and extends to the outside of the soft-package button type lithium ion battery; and the tab is also provided with tab glue.
8. The soft-package button lithium ion battery of claim 7, wherein the positive tab and the negative tab are bent and extend from the side of the soft-package button lithium ion battery to the outside of the soft-package button lithium ion battery through the heat seal layer.
9. The soft-pack button lithium ion battery of claim 7, wherein the nominal capacity of the soft-pack button lithium ion battery is 25mAh to 120 mAh.
10. An electronic device comprising the soft pack button lithium ion battery of claim 7.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201673972U (en) * | 2010-04-30 | 2010-12-15 | 中山市电赢科技有限公司 | High-power lithium-polymer battery structure |
| JP2018181606A (en) * | 2017-04-13 | 2018-11-15 | セイコーインスツル株式会社 | Electrochemical cell |
| CN209282328U (en) * | 2018-12-28 | 2019-08-20 | 东莞市美尼电池有限公司 | A kind of chargeable button-shaped soft bag lithium ionic cell |
| CN110379990A (en) * | 2019-06-20 | 2019-10-25 | 金能电池(东莞)有限公司 | A kind of button cell without soldering polar ear |
| CN110767935A (en) * | 2019-12-04 | 2020-02-07 | 东莞小锂新能源科技有限公司 | Lithium ion battery with elliptical structure and preparation method thereof |
| CN110783615A (en) * | 2019-08-06 | 2020-02-11 | 松栢投资有限公司 | Manufacturing method of soft package button type lithium battery and soft package button type lithium battery |
| CN211957812U (en) * | 2020-03-31 | 2020-11-17 | 惠州市竤泰科技有限公司 | Soft-package button type lithium ion battery, battery core assembly thereof and electronic equipment |
-
2020
- 2020-03-31 CN CN202010247626.8A patent/CN111261928A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201673972U (en) * | 2010-04-30 | 2010-12-15 | 中山市电赢科技有限公司 | High-power lithium-polymer battery structure |
| JP2018181606A (en) * | 2017-04-13 | 2018-11-15 | セイコーインスツル株式会社 | Electrochemical cell |
| CN209282328U (en) * | 2018-12-28 | 2019-08-20 | 东莞市美尼电池有限公司 | A kind of chargeable button-shaped soft bag lithium ionic cell |
| CN110379990A (en) * | 2019-06-20 | 2019-10-25 | 金能电池(东莞)有限公司 | A kind of button cell without soldering polar ear |
| CN110783615A (en) * | 2019-08-06 | 2020-02-11 | 松栢投资有限公司 | Manufacturing method of soft package button type lithium battery and soft package button type lithium battery |
| CN110767935A (en) * | 2019-12-04 | 2020-02-07 | 东莞小锂新能源科技有限公司 | Lithium ion battery with elliptical structure and preparation method thereof |
| CN211957812U (en) * | 2020-03-31 | 2020-11-17 | 惠州市竤泰科技有限公司 | Soft-package button type lithium ion battery, battery core assembly thereof and electronic equipment |
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