CN113410512A - Cylindrical solid-state battery - Google Patents
Cylindrical solid-state battery Download PDFInfo
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- CN113410512A CN113410512A CN202110817896.2A CN202110817896A CN113410512A CN 113410512 A CN113410512 A CN 113410512A CN 202110817896 A CN202110817896 A CN 202110817896A CN 113410512 A CN113410512 A CN 113410512A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- 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
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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a cylindrical solid-state battery, which comprises a cylindrical solid-state battery pole group body consisting of a positive pole, a negative pole and a solid electrolyte and a cylindrical elastic center needle at the core part of a battery core, and is characterized in that: the cylindrical battery is a cylindrical solid-state battery, the cylindrical center needle is a cylindrical elastic center needle made of elastic foam materials, and the cylindrical elastic center needle and the battery pole group form a complementary volume expansion and contraction breathing type battery cell working mode. Has the advantages that: the cylindrical solid-state battery adopts a cylindrical center needle, the center needle has a wider compression deformation range, the compression strength of the center needle is smaller than the expansion stress inside the solid-state battery, and the inward volume expansion of the battery core is absorbed, so that a breathing type battery core working mechanism is constructed, the internal volume of the battery core is maintained unchanged, and the battery core performance degradation caused by the volume change of the battery core is prevented.
Description
The application is a divisional application of a patent application named cylindrical solid-state battery, and the application date of the original application is 09 and 26 in 2018, and the application number is 201811118673.1.
Technical Field
The invention belongs to the field of lithium batteries, and particularly relates to a cylindrical solid-state battery.
Background
The solid-state battery is used as a battery with intrinsic safety property, can inhibit the occurrence of side reactions in the battery by utilizing the chemical inertia and high-strength mechanical characteristics of solid electrolyte, and can inhibit the formation of lithium dendrites, thereby optimizing and improving the safety of the lithium battery and providing a solution for the application of lithium metal in the lithium ion battery. However, in the working process of the solid-state lithium battery, a large volume change occurs, the charging type volume expands, and the volume shrinks during discharging, the volume change can cause interface damage, and particularly for a cylindrical solid-state battery with a fixed model, the radial volume change of the pole group causes severe deformation of the electrode, so that the performance of the cylindrical solid-state lithium battery is attenuated. 18650 high-capacity battery is usually increased the center needle, and the main purpose is to prevent pole piece inflation to the hole extrusion of utmost point group, leads to the inner circle to produce the deformation collapse. General center needle is stainless steel material, belongs to the electric conductive property material, and the battery receives the weight extrusion exogenic action to lead to when the battery, and the battery inner circle can produce the damage, can switch on with center needle, produces the short circuit (especially central utmost point ear structure), arouses the potential safety hazard. The surface of the central needle is coated with an insulating layer, such as polytetrafluoroethylene, so that the insulating effect can be achieved, and the short circuit risk of the battery caused by external damage is reduced. However, the insulating layer used in the prior art is easy to fall off from the surface of the central needle when the battery is extruded, and the protective effect of the insulating layer is reduced. The patent publication No. CN206834274U discloses a center pin of a cylindrical lithium ion battery, which comprises a center pin body and is characterized in that the surface of the center pin body is wrapped by an asphalt glue layer, the surface of the center pin body is provided with a protrusion, the contact surface of the asphalt glue layer and the center pin body is provided with a groove, the protrusion is embedded into the groove, and the protrusion is seamlessly connected with the groove. The main body of the central needle of the cylindrical lithium ion battery is generally a stainless steel tube, the conductivity of the stainless steel has potential safety hazards, and the central needle can become a conductor when the battery is in extreme damage conditions (such as needling, hot box, extrusion and the like), so that the positive and negative pole pieces are short-circuited. Patent publication No. CN201752020U discloses a center needle of a cylindrical lithium ion battery, which comprises a center needle main body and is characterized in that: and the surface of the central needle body is coated with an insulating layer. The surface is attached with a layer of PTFE (polytetrafluoroethylene), the strength of the stainless steel pipe plays a supporting role, and the PTFE protective film has the functions of insulation and high temperature resistance. The safety of the cylindrical lithium ion battery is improved, and the central needle can be guaranteed to have enough supporting strength.
The utility model discloses add the center needle among the technical cylinder lithium cell and mainly solved the support intensity problem of lithium cell. The technical problem that interface damage caused by volume change of a lithium battery is caused by volume expansion and volume contraction during discharging of the lithium battery, particularly a solid battery, is not really solved.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned technical deficiencies, and to provide a cylindrical solid-state battery capable of preventing the performance of the battery cell from being deteriorated due to the volume expansion and contraction during the charging and discharging processes, wherein the cylindrical center pin having high elasticity can absorb the inward volume expansion of the battery cell, so as to avoid the damage of the battery cell structure due to the volume expansion and contraction during the charging and discharging processes of the cylindrical solid-state battery, thereby ensuring the performance stability of the cylindrical solid-state battery.
In order to achieve the purpose, the invention adopts the following technical scheme: a cylindrical solid-state battery comprises a cylindrical solid-state battery pole group body consisting of a positive pole, a negative pole and a solid electrolyte, and a cylindrical central needle at the center of a battery core of the cylindrical solid-state battery, wherein the cylindrical central needle is made of an elastic foam material and is of a complete cylindrical structure;
the cylindrical elastic center needle and the battery pole group form a complementary volume expansion and contraction respiratory battery cell working mode; the breathing type battery cell has a working mode that when the negative electrode expands, the cylindrical elastic center pin shrinks volumetrically; when the negative electrode shrinks, the volume of the cylindrical elastic central needle is recovered;
the diameter of the cylindrical elastic center needle is 0.5-10 mm, and the length of the cylindrical elastic center needle is the same as the height of the battery pole group body.
Optionally, the resilient foam material comprises at least one of plastic, rubber, one-component thermoplastic elastomeric polymer; the elastic foam material comprises the following components in percentage by weight: 1 to 50 percent of plastic, 20 to 70 percent of rubber and 20 to 70 percent of single-component thermoplastic elastic polymer.
Optionally, the plastic in the resilient foam material is polypropylene, polyethylene or nylon; the rubber is ethylene propylene diene M rubber, nitrile rubber or silicon rubber natural or synthetic rubber; the single-component thermoplastic elastomer is styrene block copolymer and its mixture, thermoplastic polyurethane or thermoplastic polyester elastomer.
Optionally, the compression deformation of the cylindrical elastic center needle is 5% to epsilon 80%.
Optionally, the cylindrical elastic central needle can withstand a compressive strength (σ) in the range of 0.1MPa ≦ σ ≦ 20MPa, σ always less than the battery can rupture strength.
Optionally, the cylindrical solid-state battery pole group body formed by the solid-state electrolyte is of a winding structure.
Optionally, the cylindrical center needle fabrication material is a high elasticity foam thermoplastic vulcanizate (TPV), wherein the plastic portion is nylon and the rubber portion is ethylene propylene diene M-class rubber EPDM; the TPV/EPDM mass ratio is 6: 4.
optionally, the cylindrical center needle diameter is 1.5 mm and the cylindrical center needle length is 46 mm.
Optionally, the cylindrical center needle fabrication material is a high elasticity foam thermoplastic vulcanizate (TPV), wherein the plastic portion is nylon and the rubber portion is ethylene propylene diene M-class rubber EPDM; the TPV/EPDM mass ratio is 6.5: 3.5.
optionally, the cylindrical center needle has a diameter of 2 mm and a length of 61 mm.
Has the advantages that: compared with the prior art, the cylindrical center needle has a wider compression deformation range, the compression strength of the cylindrical center needle is smaller than the expansion stress in the solid-state battery, the inward volume expansion of the battery core is absorbed, and the cylindrical center needle is used for constructing a respiratory battery core working mechanism and maintaining the internal volume of the battery core unchanged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a cylindrical solid-state battery;
FIG. 2 is a schematic representation of the foam microstructure of a cylindrical center pin.
In the figure:
1-cylindrical solid battery pole group body, 2-cylindrical elastic central needle.
Detailed Description
The following detailed description of the preferred embodiments will be made in conjunction with the accompanying drawings.
Referring to the attached drawings in detail, the cylindrical solid-state battery comprises a cylindrical solid-state battery pole group body 1 formed by a positive electrode, a negative electrode and a solid electrolyte and a cylindrical central needle in the center of a battery core, wherein the cylindrical central needle is a cylindrical elastic central needle 2 made of elastic foam materials, and the cylindrical elastic central needle and the battery pole group form a complementary volume expansion and contraction breathing type battery core working mode.
The diameter of the cylindrical elastic center needle is 0.5-10 mm, and the length of the cylindrical elastic center needle is designed according to the specific size of the battery cell and is generally the same as the height of the pole group. The elastic foam material comprises one or more mixed materials of plastic, rubber and single-component thermoplastic elastic polymer. The plastic in the elastic foam material is polypropylene, polyethylene or nylon; the rubber is ethylene propylene diene M rubber, nitrile rubber or silicon rubber natural or synthetic rubber; the single-component thermoplastic elastomer is styrene block copolymer and its mixture, thermoplastic polyurethane or thermoplastic polyester elastomer. The mixed material comprises, by weight, 1-50% of plastic, 20-70% of rubber and 20-70% of single-component thermoplastic elastic polymer. The compression deformation of the cylindrical elastic center needle is more than or equal to 5% and less than or equal to 80%. The cylindrical elastic center pin can withstand a compressive strength (sigma) in the range of 0.1MPa to 20MPa, sigma always being less than the rupture strength of the battery can. It should be noted that, in practical applications, within the normal compression deformation range of the cylindrical elastic center pin, σ should always be smaller than the rupture strength of the battery case, so as to ensure that the cylindrical elastic center pin contracts in volume when being subjected to the pressure from the case to the inside of the battery cell, so that the cylindrical elastic center pin absorbs the inward volume expansion of the battery cell.
Example 1
A cylindrical solid state battery (14500) includes a cylindrical wound solid state lithium ion battery pole set and a cylindrical solid state battery center pin. The central needle is a cylindrical elastic central needle and can be used for a cylindrical battery core, the manufacturing material of the central needle is high-elasticity foam thermoplastic vulcanized rubber (TPV), wherein the plastic part is nylon, the rubber part is ethylene propylene diene M rubber EPDM, and the mass ratio of TPV to EPDM is 6: 4. The diameter of the cylindrical center needle is 1.5 mm, the length of the center needle is 46 mm, the center needle of the solid-state lithium ion battery has a wider compression deformation range, the compression strength of the center needle is smaller than the expansion stress inside the solid-state battery, the inward volume expansion of the battery core is absorbed, and the center needle is used for constructing a breathing type solid-state battery core working mechanism and maintaining the internal volume of the battery core unchanged.
The central needle of the solid-state lithium ion battery has high elasticity and a wider compression deformation (epsilon) range, and has the compression strength (sigma) matched with the internal expansion stress of the battery core, wherein the sigma is always smaller than the rupture strength (3MPa) of the battery shell (aluminum alloy shell). The correspondence between compression set (m%) and compression strength (σ m) is shown in table 1:
table 1, compression set and compression strength correspondence:
example 2
A cylindrical solid-state battery (18650) includes a cylindrical wound solid-state lithium ion battery pole set and a cylindrical solid-state battery center pin. A cylindrical elastic center pin can be used for a cylindrical battery core and is made of high-elasticity foam thermoplastic vulcanized rubber (TPV), wherein the plastic part is nylon, and the rubber part is ethylene propylene diene M rubber EPDM. The TPV/EPDM mass ratio was 6.5: 3.5. The diameter of the cylindrical center needle is 2 millimeters, the length of the center needle is 61 millimeters, the center needle of the solid-state lithium ion battery has a wider compression deformation range, the compression strength of the center needle is smaller than the expansion stress inside the solid-state battery, and the inward volume expansion of the battery core is absorbed, so that a breathing type solid-state battery core working mechanism is constructed, and the internal volume of the battery core is kept unchanged.
The central needle of the solid-state lithium ion battery has high elasticity and a wide range of compression deformation (epsilon), and has compression strength (sigma) matched with the internal expansion stress of the battery core, wherein the sigma is always smaller than the rupture strength (3MPa) of a battery shell (aluminum alloy shell). The correspondence between compression set (m%) and compression strength (σ m) is shown in table 2:
table 2, compression set and compression strength correspondence:
example 3
A cylindrical solid state battery (21700) includes a cylindrical wound solid state lithium ion battery pole set and a cylindrical solid state battery center pin. A cylindrical elastic center pin can be used for a cylindrical battery core and is made of high-elasticity foam thermoplastic vulcanized rubber (TPV), wherein the plastic part is nylon, and the rubber part is ethylene propylene diene M rubber EPDM. The TPV/EPDM mass ratio was 6.5: 3.5. The diameter of the cylindrical center needle is 2 millimeters, the length of the center needle is 66 millimeters, the center needle of the solid-state lithium ion battery has a wider compression deformation range, the compression strength of the center needle is smaller than the expansion stress inside the solid-state battery, and the inward volume expansion of the battery core is absorbed, so that a breathing type solid-state battery core working mechanism is constructed, and the internal volume of the battery core is kept unchanged. A center pin for a solid-state lithium-ion battery has high elasticity and a wide range of compression set (epsilon), and has a compressive strength (sigma) matching the internal expansion stress of a battery cell, wherein sigma is always smaller than the rupture strength (3MPa) of a battery shell (aluminum alloy shell). The correspondence between compression set (m%) and compression strength (σ m) is shown in table 3:
3. the corresponding relation between compression set and compression strength is as follows:
example 4
A cylindrical solid state battery (26650) includes a cylindrical wound solid state lithium ion battery pole set and a cylindrical solid state battery center pin. A cylindrical elastic center pin can be used for a cylindrical battery core and is made of high-elasticity foam thermoplastic vulcanized rubber (TPV), wherein the plastic part is nylon, and the rubber part is ethylene propylene diene M rubber EPDM. The TPV/EPDM mass ratio was 7: 3. The diameter of the cylindrical center needle is 5 millimeters, the length of the center needle is 61 millimeters, the center needle of the solid-state lithium ion battery has a wider compression deformation range, the compression strength of the center needle is smaller than the expansion stress inside the solid-state battery, and the inward volume expansion of the battery core is absorbed, so that a breathing type solid-state battery core working mechanism is constructed, and the internal volume of the battery core is kept unchanged. A center pin for a solid-state lithium-ion battery has high elasticity and a wide range of compression set (epsilon), and has a compressive strength (sigma) matching the internal expansion stress of a battery cell, wherein sigma is always smaller than the rupture strength (3MPa) of a battery shell (aluminum alloy shell). The correspondence between compression set (m%) and compression strength (σ m) is shown in table 4:
table 4, compression set and compression strength correspondence:
the above detailed description of the cylindrical solid-state battery with reference to the embodiments is illustrative and not restrictive, and several embodiments may be enumerated within the scope thereof, so that changes and modifications may be made without departing from the spirit of the present invention.
Claims (10)
1. A cylindrical solid-state battery comprises a cylindrical solid-state battery pole group body consisting of a positive pole, a negative pole and a solid electrolyte and a cylindrical central needle at the center of a battery core of the cylindrical solid-state battery, and is characterized in that the cylindrical central needle is made of an elastic foam material and is of a complete cylindrical structure;
the cylindrical elastic center needle and the battery pole group form a complementary volume expansion and contraction respiratory battery cell working mode; the breathing type battery cell has a working mode that when the negative electrode expands, the cylindrical elastic center pin shrinks volumetrically; when the negative electrode shrinks, the volume of the cylindrical elastic central needle is recovered;
the diameter of the cylindrical elastic center needle is 0.5-10 mm, and the length of the cylindrical elastic center needle is the same as the height of the battery pole group body.
2. The cylindrical solid-state battery according to claim 1, wherein the elastic foam material comprises at least one of plastic, rubber, one-component thermoplastic elastomeric polymer; the elastic foam material comprises the following components in percentage by weight: 1 to 50 percent of plastic, 20 to 70 percent of rubber and 20 to 70 percent of single-component thermoplastic elastic polymer.
3. The cylindrical solid-state battery according to claim 1, wherein the plastic in the resilient foam material is polypropylene, polyethylene, or nylon; the rubber is ethylene propylene diene M rubber, nitrile rubber or silicon rubber natural or synthetic rubber; the single-component thermoplastic elastomer is styrene block copolymer and its mixture, thermoplastic polyurethane or thermoplastic polyester elastomer.
4. The cylindrical solid-state battery according to claim 1, wherein the compression set of the cylindrical elastic center pin is 5% to e 80%.
5. The cylindrical solid-state battery according to claim 4, wherein the cylindrical elastic central needle can withstand a compressive strength (σ) in the range of 0.1MPa ≦ σ ≦ 20MPa, σ always smaller than the battery can rupture strength.
6. The cylindrical solid-state battery according to claim 1, wherein the cylindrical solid-state battery pole group body composed of the solid-state electrolyte is of a wound structure.
7. The cylindrical solid-state battery according to claim 6, wherein the cylindrical center pin making material is a highly elastic foam thermoplastic vulcanizate (TPV) in which the plastic part is nylon and the rubber part is ethylene propylene diene M-type rubber EPDM; the TPV/EPDM mass ratio is 6: 4.
8. the cylindrical solid-state battery according to claim 7, wherein the cylindrical center pin has a diameter of 1.5 mm and a length of 46 mm.
9. The cylindrical solid-state battery according to claim 6, wherein the cylindrical center pin making material is a highly elastic foam thermoplastic vulcanizate (TPV) in which the plastic part is nylon and the rubber part is ethylene propylene diene M-type rubber EPDM; the TPV/EPDM mass ratio is 6.5: 3.5.
10. the cylindrical solid-state battery according to claim 9, wherein the cylindrical center pin has a diameter of 2 mm and a length of 61 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110817896.2A CN113410512A (en) | 2018-09-26 | 2018-09-26 | Cylindrical solid-state battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110817896.2A CN113410512A (en) | 2018-09-26 | 2018-09-26 | Cylindrical solid-state battery |
| CN201811118673.1A CN109390623A (en) | 2018-09-26 | 2018-09-26 | Cylindrical solid state battery |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811118673.1A Division CN109390623A (en) | 2018-09-26 | 2018-09-26 | Cylindrical solid state battery |
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| CN113410512A true CN113410512A (en) | 2021-09-17 |
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| CN201811118673.1A Pending CN109390623A (en) | 2018-09-26 | 2018-09-26 | Cylindrical solid state battery |
| CN202110817896.2A Pending CN113410512A (en) | 2018-09-26 | 2018-09-26 | Cylindrical solid-state battery |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201773908U (en) * | 2010-09-07 | 2011-03-23 | 合肥国轩高科动力能源有限公司 | Compressible cylindrical lithium ion battery central support tube |
| CN107425176A (en) * | 2017-07-07 | 2017-12-01 | 福建猛狮新能源科技有限公司 | A kind of all-solid lithium-ion battery and preparation method thereof |
-
2018
- 2018-09-26 CN CN201811118673.1A patent/CN109390623A/en active Pending
- 2018-09-26 CN CN202110817896.2A patent/CN113410512A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201773908U (en) * | 2010-09-07 | 2011-03-23 | 合肥国轩高科动力能源有限公司 | Compressible cylindrical lithium ion battery central support tube |
| CN107425176A (en) * | 2017-07-07 | 2017-12-01 | 福建猛狮新能源科技有限公司 | A kind of all-solid lithium-ion battery and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| ANILK.BHOWMICK，（美）HOWARDL.STEPHESNS: "《弹性体手册 第2版》", 31 January 2005, 中国石化出版社 * |
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