CN112701388A - Electrode shell of steel shell button cell, steel shell button cell comprising electrode shell and application of steel shell button cell - Google Patents
Electrode shell of steel shell button cell, steel shell button cell comprising electrode shell and application of steel shell button cell Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims abstract description 35
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 32
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 22
- 239000011733 molybdenum Substances 0.000 claims abstract description 22
- 239000011651 chromium Substances 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 6
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 6
- 239000011777 magnesium Substances 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims abstract description 6
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 6
- 239000010936 titanium Substances 0.000 claims abstract description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 6
- 239000010937 tungsten Substances 0.000 claims abstract description 6
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 239000011701 zinc Substances 0.000 claims abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000011135 tin Substances 0.000 claims abstract description 4
- 239000011572 manganese Substances 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 230000014759 maintenance of location Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 238000004383 yellowing Methods 0.000 description 3
- 238000007792 addition Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 241001025261 Neoraja caerulea Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development 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
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
Abstract
The invention provides an electrode shell of a steel shell button cell, wherein steel of the electrode shell adopts 304 steel components as a matrix, and doped elements are added on the basis, wherein the doped elements comprise any one or at least two of chromium, zinc, cadmium, molybdenum, manganese, tin, nickel, tungsten, zirconium, titanium, magnesium or aluminum; the doped elements account for 0.01-10 wt% of the total mass of the 304 steel components, so that the problem of corrosivity caused by electrolyte in the cell of the steel shell button cell is solved, the K value, the yield and the appearance of the cell can be improved, and the high-low temperature storage performance and the charge-discharge cycle performance of the cell are improved.
Description
Technical Field
The invention relates to the technical field of earphone batteries, in particular to an electrode shell of a steel shell button cell, the steel shell button cell comprising the electrode shell and application of the steel shell button cell.
Background
At present, the market of the Bluetooth headset is developed rapidly, the variety of the Bluetooth headset is various, and the TWS Bluetooth headset with big heat is more beneficial to a plurality of users. The TWS bluetooth headset (True Wireless Stereo) technology is developed based on the development of chip technology, and specifically, a mobile phone is connected to a master speaker, and then the master speaker is connected to a slave speaker in a bluetooth Wireless manner, so that the bluetooth left and right channels are wirelessly separated for use. Because the two ear-hooks of the TWS Bluetooth headset do not need to be connected with wires, the left and right earphones form a stereo system through the Bluetooth, and the experience of listening to songs, talking and wearing is greatly improved. Except that the problem that a patch cord is needed after a 3.5mm interface of the mobile phone is cancelled can be avoided, and meanwhile, dual-purpose operation of one set becomes possible, for example, a part of TWS earphones can wake up an AI voice assistant by double-clicking a left ear earphone, and can switch music and other operations by double-clicking a right ear earphone.
However, the TWS headset also has a great technical challenge because a connection line with the mobile phone and a connection line between the two headsets are removed, and the two headsets form a stereo system through bluetooth, wherein the most critical problem is that the TWS headset has a small overall size, and a battery equipped with the TWS headset has a small storage capacity, so that the headset has a short service life, and needs to be charged frequently and cannot be in standby for a long time.
There has been some research on how to improve the battery of TWS headphones.
CN110784794A discloses a magnetically attracted charging TWS headset for sports, comprising: the earphone comprises an earphone body, a charging wire, a battery pack and a connector; the headset body comprises a pair of left and right TWS headsets suitable for being worn by the left ear and the right ear; the charging wires are a pair of flexible connecting wires which are adaptive to the earphone body, one end of each charging wire is connected with the earphone body, and the other end of each charging wire is connected with one end of the battery pack; the other end of the battery component is connected with the connector, and the left battery component and the right battery component are connected into an integral structure through the connector; the battery pack comprises a magnetic attraction type rechargeable battery for charging the earphone body in the use process.
CN208987144U discloses a TWS earphone battery box, which comprises an upper cover, a lower cover and an integrated hinge, wherein one end of the hinge is fixed at the joint of the upper cover, and the other end of the hinge is pivoted at the joint of the lower cover by a horizontal shaft; when the TWS earphone battery box is covered, the hinge is hidden in the shell formed by the upper cover and the lower cover, so that the service life of the TWS earphone battery box can be prolonged, but the production process of the battery box needs to be changed. The battery case is unaware of the influence of the electrode case on the charge and discharge cycle characteristics and internal resistance of the battery.
CN208590090U discloses a TWS earphone charging box, which comprises an upper cover, a lower cover connected with the upper cover, and an earphone receiving cavity fixed in the lower cover; the battery support assembly is accommodated in a space position between the two TWS earphone handles and is positioned in the middle of the earphone accommodating cavity, and the expansion assembly is accommodated at the bottom position of the earphone accommodating cavity; the battery bracket component comprises a battery bracket, batteries and a circuit board, wherein the batteries and the circuit board are respectively arranged on two sides of the battery bracket, a through groove is formed in the middle of the bracket, and the batteries and the circuit board are connected through a soft board penetrating through the through groove. The charging case is not aware of the influence of the electrode case on the charge-discharge cycle performance and internal resistance of the battery.
Therefore, it is necessary to develop a new TWS earphone battery to solve the problems of the existing TWS earphone that the internal resistance increases and the charge-discharge cycle performance decreases in storage and high-temperature environments.
Disclosure of Invention
In view of the problems in the prior art, the invention provides the electrode shell of the steel shell button cell, and other elements are doped into the 304 steel component of the electrode shell, so that the problems of blackening and yellowing of the electrode shell are solved, the problem of corrosivity caused by electrolyte in a cell of the TWS earphone button cell is relieved, the cell performance and the charge-discharge cycle performance are improved, and the application prospect is wide.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an electrode shell of a steel-shell button cell, wherein the electrode shell is made of steel; the steel comprises a 304 steel component and doped elements; the doped element comprises any one or at least two elements of chromium, zinc, cadmium, molybdenum, manganese, tin, nickel, tungsten, zirconium, titanium, magnesium or aluminum; the single element in the doped elements accounts for 0.01-10 wt% of the total mass of the 304 steel components.
According to the electrode shell of the steel shell button cell provided by the invention, any one or at least two elements of chromium, zinc, cadmium, molybdenum, manganese, tin, nickel, tungsten, zirconium, titanium, magnesium or aluminum are doped into the steel shell electrode shell, and the doping amount of the elements is controlled to be 0.01-10 wt% of the total mass of 304 steel components, so that the problems of blackening and yellowing of the electrode shell are obviously improved, and the cell performance and the charge-discharge cycle performance are improved.
The amount of the element added to the electrode shell of the button cell for earphones is 0.01 to 10 wt% of the total mass of the 304 steel component, and may be, for example, 0.01 wt%, 1.12 wt%, 2.23 wt%, 3.34 wt%, 4.45 wt%, 5.56 wt%, 6.67 wt%, 7.78 wt%, 8.89 wt%, or 10 wt%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the doping element accounts for 0.5-8 wt% of the total mass of the steel 304 component, such as 0.5 wt%, 1.4 wt%, 2.2 wt%, 3 wt%, 3.9 wt%, 4.7 wt%, 5.5 wt%, 6.4 wt%, 7.2 wt% or 8 wt%, but not limited to the enumerated values, and other values not enumerated in this range are also applicable.
Preferably, the chromium is incorporated in an amount of 0.01 to 8.5 wt% based on the total weight of the steel 304 component, for example, 0.01 wt%, 0.96 wt%, 1.9 wt%, 2.84 wt%, 3.79 wt%, 4.73 wt%, 5.67 wt%, 6.62 wt%, 7.56 wt%, or 8.5 wt%, but not limited to the above-mentioned values, and other values not listed in the range are also applicable.
Preferably, the incorporated zinc is 0.01 to 8.5 wt% of the total mass of the steel 304 component, and may be, for example, 0.01 wt%, 0.96 wt%, 1.9 wt%, 2.84 wt%, 3.79 wt%, 4.73 wt%, 5.67 wt%, 6.62 wt%, 7.56 wt%, or 8.5 wt%, but not limited to the enumerated values, and other values not enumerated within the range are also applicable.
Preferably, the cadmium is incorporated in an amount of 0.01 to 6.5 wt% based on the total weight of the steel 304 component, for example, 0.01 wt%, 0.74 wt%, 1.46 wt%, 2.18 wt%, 2.9 wt%, 3.62 wt%, 4.34 wt%, 5.06 wt%, 5.78 wt%, or 6.5 wt%, but not limited to the above-mentioned values, and other values not listed in the range are also applicable.
Preferably, the molybdenum is incorporated in an amount of 0.01 to 9.5 wt% based on the total weight of the steel 304 component, for example, 0.01 wt%, 1.07 wt%, 2.12 wt%, 3.18 wt%, 4.23 wt%, 5.29 wt%, 6.34 wt%, 7.4 wt%, 8.45 wt%, or 9.5 wt%, but not limited to the above-mentioned values, and other values not listed in the range are also applicable.
Preferably, the manganese is incorporated in an amount of 0.01 to 7.6 wt% based on the total mass of the steel 304 component, for example, 0.01 wt%, 0.86 wt%, 1.7 wt%, 2.54 wt%, 3.39 wt%, 4.23 wt%, 5.07 wt%, 5.92 wt%, 6.76 wt%, or 7.6 wt%, but not limited to the above-mentioned values, and other values not listed in the range are also applicable.
Preferably, the doped tin is 0.5 to 7.8 wt% of the total mass of the 304 steel component, and may be, for example, 0.5 wt%, 1.4 wt%, 2.2 wt%, 3 wt%, 3.8 wt%, 4.6 wt%, 5.4 wt%, 6.2 wt%, 7 wt%, or 7.8 wt%, etc., but is not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the nickel content of the doped nickel is 0.01 to 9 wt% of the total weight of the steel 304 component, for example, 0.01 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8. wt%, or 9 wt%, etc., but not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the doped tungsten is 0.02 to 8.5 wt% of the total weight of the steel 304 component, such as 0.02 wt%, 0.97 wt%, 1.91 wt%, 2.85 wt%, 3.79 wt%, 4.74 wt%, 5.68 wt%, 6.62 wt%, 7.56 wt%, or 8.5 wt%, but not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the doped zirconium is 0.01 to 6.7 wt% of the total weight of the steel 304 component, such as 0.01 wt%, 0.76 wt%, 1.5 wt%, 2.24 wt%, 2.99 wt%, 3.73 wt%, 4.47 wt%, 5.22 wt%, 5.96 wt%, or 6.7 wt%, but not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the doped titanium accounts for 0.8-9.6 wt% of the total mass of the steel 304 component, and may be, for example, 0.8 wt%, 1.8 wt%, 2.8 wt%, 3.8 wt%, 4.8 wt%, 5.7 wt%, 6.7 wt%, 7.7 wt%, 8.7 wt%, or 9.6 wt%, but is not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the magnesium is incorporated in an amount of 0.5 to 3.5 wt% based on the total mass of the steel 304 component, for example, 0.5 wt%, 0.9 wt%, 1.2 wt%, 1.5 wt%, 1.9 wt%, 2.2 wt%, 2.5 wt%, 2.9 wt%, 3.2 wt%, or 3.5 wt%, but not limited to the above-mentioned values, and other values not listed in the range are also applicable.
Preferably, the doped aluminum accounts for 0.01 to 6.4 wt% of the total mass of the steel 304 component, and may be, for example, 0.01 wt%, 0.72 wt%, 1.43 wt%, 2.14 wt%, 2.85 wt%, 3.56 wt%, 4.27 wt%, 4.98 wt%, 5.69 wt%, or 6.4 wt%, but not limited to the enumerated values, and other values not enumerated within the range are also applicable.
Preferably, the doping element comprises any one of molybdenum, manganese or nickel or a combination of at least two thereof, preferably a combination of molybdenum and nickel.
Preferably, the doped nickel is 0.5 to 7 wt% of the total weight of the steel 304 component, such as 0.5 wt%, 1.3 wt%, 2 wt%, 2.7 wt%, 3.4 wt%, 4.2 wt%, 4.9 wt%, 5.6 wt%, 6.3 wt%, or 7 wt%, but not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the mass ratio of the doped nickel to the nickel in the 304 steel component is 0.05 to 0.7:1, and may be, for example, 0.05:1, 0.1:1, 0.15:1, 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, 0.45:1, 0.5:1, 0.55:1, 0.60:1, 0.65:1, or 0.70:1, but not limited to the recited values, and other values not recited in this range are equally applicable.
According to the invention, the corrosion of the electrode shell of the TWS earphone button cell caused by high potential in the processes of high-temperature circulation and high-temperature and high-humidity storage can be more effectively prevented by controlling the mass ratio of the doped nickel to the nickel in the original 304 steel component.
Preferably, the molybdenum is incorporated in an amount of 0.5 to 5 wt% based on the total weight of the steel 304 component, for example, 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, or 5 wt%, but not limited to the recited values, and other values not recited in this range are also applicable, preferably 1 to 4 wt%.
Preferably, the mass ratio of the doped nickel to the doped molybdenum is 1.0 to 2.5:1, and may be, for example, 1.0:1, 1.1:1, 1.2:1, 1.5:1, 1.8:1, 2.0:1, 2.2:1, or 2.5:1, but is not limited to the recited values, and other values not recited within this range are also applicable.
The invention better promotes the anti-corrosion effect of the nickel and the molybdenum in steel by further controlling the mass ratio of the nickel to the molybdenum, thereby more effectively preventing the electrode shell from blackening and yellowing when being applied to a TWS earphone button cell and further improving the cell performance in a high-temperature cycle process and a high-temperature and high-humidity storage process.
Preferably, the total of the nickel and molybdenum is 1-10 wt%, such as 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt% or 10 wt%, based on the total weight of the 304 steel component, but not limited to the recited values, and other values not recited in this range are also applicable.
According to the invention, the sum of the doped nickel and the doped molybdenum accounts for 1-10 wt% of the total weight of the 304 steel components, and the nickel and the molybdenum cooperate with each other to further improve the cycle performance of the battery and reduce the increase value of internal resistance at high temperature.
The 304 steel comprises the following components in percentage by mass: less than or equal to 0.08 percent of C, less than or equal to 2.0 percent of Mn, less than or equal to 0.045 percent of P, less than or equal to 0.030 percent of S, less than or equal to 1 percent of Si, 18.0 to 20.0 percent of Cr, 8.0 to 10.5 percent of Ni, less than or equal to 0.05 percent of other impurities, and the balance of iron.
The steel material 304 of the present invention may contain C of not more than 0.08%, for example, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, or 0.08%, etc., but is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
Mn is 2.0% or less, and may be, for example, 1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, but is not limited to the values listed, and other values not listed in the range are also applicable.
P.ltoreq.0.045%, for example, 0.020%, 0.023%, 0.026%, 0.029%, 0.032%, 0.034%, 0.037%, 0.04%, 0.043%, 0.045%, etc., but is not limited to the values listed, and other values not listed in this range are also applicable.
S is 0.030%, for example, 0.015%, 0.017%, 0.019%, 0.02%, 0.022%, 0.024%, 0.025%, 0.027%, 0.029%, or 0.03%, etc., but the values are not limited to those listed, and other values not listed in the range are also applicable.
Si is 1% or less, and may be, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%, but is not limited to the values listed, and other values not listed in the range are also applicable.
18.0 to 20.0% of Cr, for example, 18.0%, 18.3%, 18.5%, 18.7%, 18.9%, 19.2%, 19.4%, 19.6%, 19.8% or 20.0%, etc., but not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
Ni is 8.0 to 10.5%, and may be 8.0%, 8.3%, 8.6%, 8.9%, 9.2%, 9.4%, 9.7%, 10%, 10.3%, or 10.5%, for example, but not limited to the values listed, and other values not listed in the range are also applicable.
The content of the other impurities is 0.05% or less, and may be, for example, 0.01%, 0.02%, 0.03%, 0.04%, or 0.05%, but is not limited to the values listed, and other values not listed in the range are also applicable.
In a second aspect, the invention provides a button cell, wherein the electrode shell of the button cell in the first aspect is used as a positive electrode shell and/or a negative electrode shell.
The button cell provided by the invention adopts the electrode shell of the first aspect, so that the cycle performance and the cell performance of the cell are obviously improved.
In the button cell of the present invention, the corrosion-resistant electrode shell according to the first aspect is used as the positive electrode shell and/or the negative electrode shell, which can be used as both the positive electrode shell and the negative electrode shell or only one of the positive electrode shell and the negative electrode shell, preferably, the corrosion-resistant electrode shell according to the first aspect is used for both the positive electrode shell and the negative electrode shell
Preferably, the button cell is a lithium ion secondary battery.
Preferably, the button cell comprises a positive electrode, a negative electrode and a separator arranged between the positive electrode and the negative electrode.
The positive electrode comprises a positive electrode shell and a positive electrode active material filled between the positive electrode shell and the diaphragm;
the negative electrode includes a negative electrode can and a negative active material filled between the negative electrode can and the separator.
The positive electrode active material is not limited in the present invention, and any substance which can be used for the positive electrode active material and is well known to those skilled in the art can be used, and can be adjusted and optimized according to the actual situation, for example, a ternary material, lithium cobaltate, lithium manganate, lithium titanate, manganese dioxide, or the like can be used.
The negative electrode active material is not limited in the present invention, and any material known to those skilled in the art to be used for the negative electrode active material may be used, and may be adjusted and optimized according to the actual situation, for example, negative electrode graphite materials including natural graphite and artificial graphite, silicon negative electrode materials including silicon-oxygen negative electrode and silicon-carbon negative electrode, or lithium ribbon.
In a third aspect, the invention provides the use of said steel-shelled button cell in a bluetooth headset, preferably a TWS headset.
The battery of the Bluetooth headset has the characteristic of small volume, wherein the electrode shell of the button battery has small area and needs to be stored for a long time in the using process, the service life and the charging and discharging cycle performance of the battery of the Bluetooth headset can be obviously improved by adopting the steel shell button battery of the second aspect of the invention, and the steel shell button battery is applied to the TWS Bluetooth headset and effectively solves the problems of high internal resistance increase and cycle performance reduction of the battery in the storing process of the existing TWS Bluetooth headset.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the electrode shell of the steel-shell button cell provided by the invention can improve the K value, the yield and the appearance of a cell, and prevent the corrosion of the positive electrode shell caused by high potential in the processes of high-temperature circulation and high-temperature and high-humidity storage;
(2) the electrode shell of the steel-shell button cell provided by the invention reduces the increase of the internal resistance of the button cell at high temperature and improves the cycle performance of the button cell;
(3) the steel shell button cell provided by the invention has better high-temperature circulation and high-temperature and high-humidity storage performance, and can better meet the requirement of a TWS earphone on the cell.
Drawings
Fig. 1 is a graph of internal resistance change of button cells tested at 75 ℃ for 100h after the electrode shells in example 1 and comparative example 1 of the invention are applied.
Fig. 2 is a graph showing the variation of the capacity retention rate of the button cell after the electrode shell is applied in the environment of 45 ℃ in the case of the button cell in the embodiment 1 and the comparative example 1 of the invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The components of the 304 steel in the following examples and comparative examples are as follows by mass percent: 0.05 percent of C, 1 percent of Mn, 0.035 percent of P, 0.028 percent of S, 1 percent of Si, 18 percent of Cr, 9.8 percent of Ni, less than or equal to 0.05 percent of other impurities and the balance of iron.
First, an embodiment
Examples 1 to 13 and comparative examples 1 to 3
Embodiments 1 to 13 and comparative examples 1 to 3 provide an electrode case of a TWS earphone button cell, the electrode case being made of steel; the steel comprises a 304 steel component and doped elements; the doping elements and the doping amounts in examples 1 to 13 and comparative examples 1 to 3 are shown in Table 1.
TABLE 1
In table 1 "/" indicates that the element is not incorporated.
The electrode shell is simultaneously applied to a negative electrode shell and a positive electrode shell of the button cell, the diaphragm is a PP and PE composite diaphragm, the negative electrode active material is a graphite negative electrode material, and the positive electrode active material is a ternary material; and testing the internal resistance and the cycle performance by adopting an alternating-current internal resistance voltage tester and a blue-ray and Xinwei test cabinet.
Taking example 1 and comparative example 1 of the invention as an example, the internal resistance change chart of the button cell tested for 100h at 75 ℃ after the electrode shell is applied in example 1 and comparative example 1 is shown in fig. 1, and it can be seen from fig. 1 that the special improved steel doped with specific elements can obviously improve the internal resistance increase rate in the high-temperature storage process, mainly because the corrosion of the steel shell can be inhibited, and the occurrence of side reactions in the high-temperature storage process can be reduced.
Fig. 2 shows a graph of the capacity retention rate variation of the button cell after the electrode shell is applied in example 1 and comparative example 1, and it can be seen from fig. 2 that a special improved steel doped with a specific element can obviously improve the high-temperature cycle retention rate, mainly because the corrosion of the steel shell can be inhibited, and the occurrence of side reactions during the high-temperature storage process can be reduced.
The results of the internal resistance and cycle performance tests of the above examples and comparative examples are shown in table 2.
TABLE 2
From tables 1 and 2, the following points can be seen:
(1) from the comprehensive examples 1 to 13, the electrode shell of the steel-shell button cell provided by the invention is slightly adjusted on the basis of the original 304 stainless steel composition, and part of elements are doped, so that the increase of the internal resistance of the button cell at high temperature is remarkably reduced, the increase of the internal resistance is less than or equal to 85m omega after the button cell is stored for 100 hours at 75 ℃, the cycle performance of the button cell is improved, the capacity retention rate is more than or equal to 85 percent after the button cell is cycled for 500 times at 45 ℃, and the requirement of a TWS earphone on the cell can be better met;
(2) it can be seen from the combination of example 3 and comparative example 3 that, in example 3, the doping amount of a single element is strictly controlled within 10 wt%, compared with 12 wt% of the doping amount of nickel element in comparative example 3, the increase of internal resistance of the battery made of the electrode shell of the steel-shell button cell provided in example 3 after being stored for 100h at 75 ℃ is 50m Ω, the capacity retention rate is 92% after being cycled for 500 times at 45 ℃, and the increase of internal resistance of the battery in comparative example 3 after being stored for 100h at 75 ℃ is 117m Ω, and the capacity retention rate is only 76% after being cycled for 500 times at 45 ℃, thereby showing that the cycling and cell performance of the steel-shell button cell are significantly improved by controlling the addition amount of the single element within a specific range;
(3) it can be seen from the combination of examples 4 and 5 to 6 that, compared with the case where only one element of nickel and molybdenum is added in examples 5 to 6, the increase of internal resistance of the battery in example 4 after being stored for 100h at 75 ℃ is 51m Ω, and the capacity retention rate of the battery in example 4 after being cycled for 500 times at 45 ℃ is 96%, while the increase of internal resistance of the battery in examples 5 and 6 after being stored for 100h at 75 ℃ is 69m Ω, and the capacity retention rate of the battery in example 5 and 6 after being cycled for 500 times at 45 ℃ is 88% and 89%, respectively, which indicates that the performance of the battery is improved by simultaneously doping nickel and molybdenum and controlling the ratio thereof in a specific range.
In conclusion, the electrode shell of the steel-shell button cell solves the problem of corrosivity caused by electrolyte in the cell of the steel-shell button cell, increases the internal resistance by less than or equal to 85m omega after the electrode shell is stored for 100 hours at 75 ℃, improves the cycle performance of the button cell, maintains the capacity retention rate by more than or equal to 85 percent after the electrode shell is cycled for 500 times at 45 ℃, and improves the high-low temperature storage performance and the charge-discharge cycle performance of the cell.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. An electrode shell of a steel shell button cell is characterized in that the material of the electrode shell is steel;
the steel comprises a 304 steel component and doped elements;
the doped element comprises any one or at least two elements of chromium, zinc, cadmium, molybdenum, manganese, tin, nickel, tungsten, zirconium, titanium, magnesium or aluminum;
the single element in the doped elements accounts for 0.01-10 wt% of the total mass of the 304 steel components.
2. The electrode shell according to claim 1, wherein the doped element accounts for 0.5-8 wt% of the total mass of the 304 steel component.
3. The electrode shell according to claim 1 or 2, wherein the doped chromium accounts for 0.01-8.5 wt% of the total mass of the 304 steel component;
preferably, the doped zinc accounts for 0.01-8.5 wt% of the total mass of the 304 steel components;
preferably, the doped cadmium accounts for 0.01-6.5 wt% of the total weight of the 304 steel components;
preferably, the doped molybdenum accounts for 0.01-9.5 wt% of the total mass of the 304 steel component.
4. The electrode shell according to any one of claims 1 to 3, wherein the manganese is incorporated in an amount of 0.01 to 7.6 wt% based on the total mass of the 304 steel component;
preferably, the doped tin accounts for 0.5-7.8 wt% of the total mass of the 304 steel component;
preferably, the doped nickel accounts for 0.01-9 wt% of the total mass of the 304 steel components;
preferably, the doped tungsten accounts for 0.02-8.5 wt% of the total mass of the 304 steel components;
preferably, the doped zirconium accounts for 0.01-6.7 wt% of the total mass of the 304 steel component.
5. The electrode shell according to any one of claims 1 to 4, wherein the doped titanium accounts for 0.8 to 9.6 wt% of the total mass of the 304 steel component;
preferably, the doped magnesium accounts for 0.5-3.5 wt% of the total mass of the 304 steel component;
preferably, the doped aluminum accounts for 0.01-6.4 wt% of the total mass of the 304 steel component.
6. The electrode shell according to any one of claims 1 to 5, wherein the doping element comprises any one of molybdenum, manganese or nickel or a combination of at least two thereof, preferably a combination of molybdenum and nickel.
7. The electrode shell according to any one of claims 1 to 6, wherein the doped nickel accounts for 0.5 to 7 wt% of the total mass of the 304 steel component;
preferably, the mass ratio of the doped nickel to the nickel in the 304 steel component is 0.05-0.7: 1.
8. The electrode shell according to any one of claims 1 to 7, wherein the doped molybdenum accounts for 0.5 to 5 wt%, preferably 1 to 4 wt% of the total mass of the 304 steel component;
preferably, the mass ratio of the doped nickel to the doped molybdenum is 1.0-2.5: 1;
preferably, the sum of the doped nickel and the doped molybdenum accounts for 1-10 wt% of the total mass of the 304 steel component.
9. A steel-shell button cell, characterized in that the electrode shell of the steel-shell button cell according to any one of claims 1 to 8 is used as a positive electrode shell and/or a negative electrode shell.
10. Use of the steel-shelled button cell according to claim 9 in a bluetooth headset, preferably in a TWS headset.
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