CN219591464U - Cylindrical lithium metal secondary battery - Google Patents
Cylindrical lithium metal secondary battery Download PDFInfo
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- CN219591464U CN219591464U CN202222962861.0U CN202222962861U CN219591464U CN 219591464 U CN219591464 U CN 219591464U CN 202222962861 U CN202222962861 U CN 202222962861U CN 219591464 U CN219591464 U CN 219591464U
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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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Abstract
The utility model relates to the technical field of lithium batteries, in particular to a cylindrical lithium metal secondary battery. A cylindrical lithium metal secondary battery comprising: the battery cell comprises a shell, a battery cell electrode group arranged in the shell and electrolyte filled in the shell; the battery cell electrode group comprises a winding electrode group and electrode lugs arranged on the winding electrode group; the winding electrode group is formed by winding a positive electrode, a negative electrode and a diaphragm; the negative electrode is a metal lithium sheet, and the metal lithium sheet is used as a negative electrode current collector and a negative electrode active material. The cylindrical lithium metal secondary battery of the utility model takes the metal lithium sheet as the negative electrode, has the functions of active substances and current collectors, omits the common copper current collector, greatly reduces the thickness between the diaphragms of the winding electrode group, and greatly improves the energy density of the battery. And with the cylindrical battery structure, stable charge and discharge cycles are achieved without applying external pressure.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a cylindrical lithium metal secondary battery.
Background
The lithium ion battery stores energy and discharges by utilizing the concentration difference of lithium ions, and no metal lithium exists in the battery. And lithium metal batteries use lithium metal as an electrode to generate electric energy through corrosion or oxidation of the lithium metal. Since lithium metal has extremely high theoretical specific capacity, most negative reduction potential and extremely small density, the energy density of lithium metal batteries is far greater than other battery systems. The current lithium metal battery is mainly a disposable battery, and is discarded after use and cannot be charged, so that the lithium metal battery is also called a primary battery. A lithium metal secondary battery is a type of rechargeable lithium battery having lithium metal as a negative electrode, and includes various types according to a difference in a positive electrode material.
However, because of the volume expansion problem of lithium metal, the secondary lithium metal battery needs to operate under the condition that the external clamp provides pressure, which brings great inconvenience to the test and use of the battery.
In view of this, the present utility model has been made.
Disclosure of Invention
The utility model aims to provide a cylindrical lithium metal secondary battery so as to solve the technical problems of high use complexity, low safety, low energy density and the like of the lithium metal secondary battery in the prior art.
In order to achieve the above object of the present utility model, the following technical solutions are specifically adopted:
a cylindrical lithium metal secondary battery comprising: the battery cell comprises a shell, a battery cell electrode group arranged in the shell and electrolyte filled in the shell;
the battery cell electrode group comprises a winding electrode group and electrode lugs arranged on the winding electrode group;
the winding electrode group is formed by winding a positive electrode, a negative electrode and a diaphragm;
the negative electrode is a metal lithium sheet, and the metal lithium sheet is used as a negative electrode current collector and a negative electrode active material.
The cylindrical lithium metal secondary battery of the utility model takes the metal lithium sheet as the negative electrode, has the functions of active substances and current collectors, omits the common copper current collector, greatly reduces the thickness between the diaphragms of the winding electrode group, and greatly improves the energy density of the battery. And with the cylindrical battery structure, stable charge and discharge cycles are achieved without applying external pressure.
In one embodiment of the present utility model, the assembly coefficient of the cylindrical lithium metal secondary battery is 88.5% to 93.2%.
By adopting a certain assembly coefficient, the stability of the charge-discharge cycle of the cylindrical lithium metal secondary battery under the condition of no external pressure is further improved, the battery test and operation environment can be simplified, and the battery operation cost can be reduced.
In one embodiment of the present utility model, the material of the housing is steel.
The shell made of steel is harder in texture and higher in mechanical strength, and can provide pressure required by the operation of the cylindrical metal secondary battery by matching with corresponding assembly coefficients, so that an additional pressure providing device is not needed.
In one embodiment of the utility model, the metallic lithium sheet has a thickness of 50 μm or less.
The utility model takes the ultrathin metal lithium sheet as the negative electrode, which not only omits an extra current collector, but also greatly reduces the thickness between the diaphragms of the winding electrode group and greatly improves the energy density of the battery.
In one embodiment of the present utility model, the tab includes a positive tab and a negative tab; the positive electrode tab and the negative electrode tab are respectively connected to the positive electrode and the negative electrode.
In one embodiment of the present utility model, the positive electrode tab is an aluminum strip, and the negative electrode tab is a nickel strip.
In one embodiment of the present utility model, the positive electrode includes a positive electrode current collector and a positive electrode active material layer disposed on a surface of the positive electrode current collector. Further, the material of the positive electrode active material layer is formed by mixing an active material, a conductive agent and a binder.
In one embodiment of the present utility model, the positive electrode active material layer has an areal density of < 40mg/cm 2 。
In one embodiment of the present utility model, the positive electrode active material includes any one of lithium cobaltate, ternary material, and lithium iron phosphate material.
In one embodiment of the present utility model, the cylindrical lithium metal secondary battery is any one of 18650 cylindrical batteries, 14500 cylindrical batteries, and 21700 cylindrical batteries. Further, for the 18650 cylindrical battery, the weight energy density is more than or equal to 380Wh/kg, and the volume energy density is more than or equal to 850Wh/kL; the capacity is more than 4000mAh.
In one embodiment of the present utility model, the positive electrode tab and the negative electrode tab are provided with high temperature adhesive tapes.
In one embodiment of the present utility model, the cylindrical lithium metal secondary battery further includes a cap, which is provided over the case.
In one embodiment of the utility model, the positive electrode tab is welded to the cap; the negative electrode tab is welded and connected to the bottom of the inner side of the shell.
In one embodiment of the utility model, the separator is a porous polymer separator. Further, the thickness of the separator is 20 to 25 μm.
In one embodiment of the utility model, the electrolyte is a liquid organic electrolyte.
In one embodiment of the utility model, the top and bottom of the battery cell electrode group are respectively provided with an upper insulating gasket and a lower insulating gasket. Further, strip-shaped holes for penetrating the positive electrode lugs and the negative electrode lugs are respectively formed in the upper insulating gasket and the lower insulating gasket.
Compared with the prior art, the utility model has the beneficial effects that:
compared with a lithium metal primary battery, the cylindrical lithium metal secondary battery can be charged and discharged for many times, has higher load voltage, and has more advantages in the aspects of resource utilization and environmental protection; compared with a soft-package secondary lithium metal battery, the lithium metal secondary battery can provide required pressure, an external pressure device can be omitted, battery testing and operation environments are simplified, battery operation cost is reduced, and the like. Meanwhile, the ultrathin metal lithium sheet is used as an active material and a current collector, so that the common rest negative current collectors are omitted, and the lithium metal secondary battery has excellent capacity and energy density.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a cylindrical lithium metal secondary battery according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a battery cell electrode set according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a partial cross-sectional structure of a battery cell electrode set according to an embodiment of the present utility model;
fig. 4 is a charge and discharge curve of 18650 cylindrical lithium metal secondary battery provided in example 1 of the present utility model.
Reference numerals:
1-a housing; 2-a battery cell electrode group; 3-capping;
21-positive electrode; 22-negative electrode; 23-a membrane;
24-positive electrode lugs; 25-high temperature adhesive tape; 26-upper insulating spacers;
27-a lower insulating spacer; 211-positive current collector; 212-positive electrode active material layer.
Detailed Description
The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present utility model, and are intended to be illustrative of the present utility model only and should not be construed as limiting the scope of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic view of a cylindrical lithium metal secondary battery according to an embodiment of the present utility model; fig. 2 is a schematic structural diagram of a battery cell electrode set according to an embodiment of the present utility model; fig. 3 is a schematic diagram of a partial cross-sectional structure of a battery cell electrode set according to an embodiment of the present utility model. As shown in fig. 1, 2 and 3, the cylindrical lithium metal secondary battery provided in this embodiment includes:
the battery comprises a shell 1, a battery cell electrode group 2 arranged in the shell 1 and electrolyte filled in the shell 1;
the battery core electrode group 2 comprises a winding electrode group and electrode lugs arranged on the winding electrode group;
the winding electrode group is formed by winding a positive electrode 21, a negative electrode 22 and a separator 23;
the anode 22 is a metal lithium sheet that serves as an anode current collector and an anode active material.
The battery using the metal lithium sheet as the negative electrode has very high energy density, but as the battery charging and discharging cycle is carried out, the lithium negative electrode expands, so that the thickness of the lithium negative electrode is increased, the battery performance is rapidly attenuated, and therefore, external pressure is required to assist the operation of the battery, the aluminum plastic film of the soft-packed battery is softer, the restraining force is too small, and an additional clamp is required to provide the required pressure, so that the battery test or use process is too complex.
The cylindrical lithium metal secondary battery of the utility model takes the metal lithium sheet as the negative electrode, has the functions of active substances and current collectors, omits the common copper current collector, greatly reduces the thickness between the diaphragms of the winding electrode group, and greatly improves the energy density of the battery. And with the cylindrical battery structure, stable charge and discharge cycles are achieved without applying external pressure.
Further, the housing 1 may be open at least at one end. Further comprises: a cap 3 provided at the open end of the housing 1.
Further, the assembly coefficient of the cylindrical lithium metal secondary battery is 88.5% to 93.2%.
As in the various embodiments, the assembly coefficient of the cylindrical lithium metal secondary battery may be 88.5%, 89.5%, 90%, 90.5%, 91.5%, 92.5%, 93.2%, etc.
By adopting the assembly coefficient, the stability of the charge-discharge cycle of the cylindrical lithium metal secondary battery under the condition of no external pressure is further improved, the battery test and operation environment can be simplified, the battery operation cost can be reduced, and the like. And the capacity, the energy density and the like of the cylindrical lithium metal secondary battery are ensured.
In actual operation, the assembly coefficient is adjusted by adjusting the load, thickness, and length of the positive electrode active material layer 212 of the positive electrode 21, the thickness and length of the negative electrode 22, and the thickness and length of the separator 23. For example, when the thickness of the pole piece is determined, the assembly coefficient can be adjusted by adjusting the length of the pole piece, and vice versa. Specifically, the calculation formula of the assembly coefficient is: fitting coefficient = cross sectional area of the wound cell/inner cross sectional area of the housing.
Further, the housing 1 is made of steel. The shell 1 made of steel has harder texture and higher mechanical strength, and can provide the pressure required by the operation of the cylindrical metal secondary battery, and an additional device for providing the pressure is not needed.
The battery cell electrode group 2 is a cylindrical battery cell electrode group; the housing 1 is a cylindrical housing.
Further, the sidewall thickness of the case 1 may be the case thickness of a conventional cylindrical battery.
In actual operation, positive electrode 21 and negative electrode 22 are separated by separator 23 and wound to form a wound electrode group. For example, the wound electrode group is formed by sequentially stacking and winding the positive electrode 21, the separator 23, the negative electrode 22, and the separator 23.
Further, the thickness of the metal lithium sheet is less than or equal to 50 mu m. As in the various embodiments, the thickness of the metallic lithium sheet may be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc., without being limited thereto.
The lithium sheet with the thickness is matched with the corresponding assembly coefficient and the steel shell, so that the pressure provided by the battery steel shell can be regulated and controlled, and the stability in the charge and discharge operation process is ensured; and ensures manufacturability of the wound pole group.
Further, the positive electrode 21 includes a positive electrode current collector 211 and a positive electrode active material layer 212 provided on a surface of the positive electrode current collector 211. The positive electrode current collector 211 may be an aluminum foil current collector, for example.
Further, the material of the positive electrode active material layer 212 is formed by mixing an active material, a conductive agent, and a binder.
In actual operation, the positive electrode active material layer 212 may be formed by coating a positive electrode material on the surface of the positive electrode current collector 211 and drying. Wherein the active material may be formulated according to its composition. The active material may include any one of lithium cobaltate, ternary material such as a high nickel ternary material, and lithium iron phosphate material; the conductive agent may include any one of carbon black, conductive graphite, carbon nanotubes, and carbon fibers; the binder may be any one of polyvinylidene fluoride, polyamide resin, and sodium carboxymethyl cellulose.
The utility model does not limit the material of the positive electrode active material layer, and can be matched with a lithium metal negative electrode to form the positive electrode active material of the lithium metal secondary battery.
Further, the surface density of the positive electrode active material layer 212 is < 40mg/cm 2 . As in the various embodiments, the areal density of the positive electrode active material layer 212 may be 38mg/cm 2 、35mg/cm 2 、32mg/cm 2 、30mg/cm 2 、25mg/cm 2 、20mg/cm 2 、15mg/cm 2 Etc., not limited thereto.
The utility model adopts the positive electrode active material layer 212 with certain surface density and is matched with the metal lithium sheet with certain thickness, so that the strength of the steel shell 1 can support the pressure required by the operation of the cylindrical metal secondary battery, and the stability and the safety of the battery operation can be ensured.
Further, the cylindrical lithium metal secondary battery may be any one of 18650 cylindrical batteries, 14500 cylindrical batteries, and 21700 cylindrical batteries. For 18650 cylindrical batteries, the weight energy density is more than or equal to 380Wh/kg, and the volume energy density is more than or equal to 850Wh/kL; the capacity is more than 4000mAh.
Further, the tab includes a positive tab 24 and a negative tab (not shown), and the positive tab 24 and the negative tab are connected to the positive electrode 21 and the negative electrode 22, respectively.
As in practical operation, in order to ensure the connection stability of the positive electrode tab 24 and the negative electrode tab with the positive electrode 21 and the negative electrode 22, respectively, the positive electrode tab 24 and the negative electrode tab may be welded to the positive electrode 21 and the negative electrode 22, respectively.
Further, the positive electrode tab 24 may be an aluminum strip, and the negative electrode tab may be a nickel strip.
In actual operation, the dimensions of the positive electrode tab 24 and the negative electrode tab can be adjusted according to actual requirements.
Further, high temperature adhesive tapes 25 may be provided on the positive electrode tab 24 and the negative electrode tab. The high-temperature adhesive tape 25 is wound around the positive electrode tab 24 and the negative electrode tab, respectively.
Further, the positive electrode tab 24 is welded and connected to the cap 3; the negative electrode tab is welded and connected to the bottom of the inner side of the steel shell 1.
Further, the separator 23 is a porous polymer separator. The material of the separator 23 may be PP/PE/PP composite film or the like.
Further, the thickness of the separator is 20 to 25 μm. Such as 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, etc.
Further, the electrolyte is a liquid organic electrolyte. The electrolyte may be a carbonate-based electrolyte or the like.
Further, the top and bottom of the battery cell pole group 2 are respectively provided with an upper insulating spacer 26 and a lower insulating spacer 27. Further, strip-shaped holes for penetrating the positive electrode tab 24 and the negative electrode tab are respectively provided on the upper insulating spacer 26 and the lower insulating spacer 27.
In addition, in order to ensure the sealability of the cylindrical lithium metal secondary battery, a sealing ring can be arranged on the shell 1 or the cover cap 3, and a buckle or a groove can be respectively arranged on the shell 1 or the cover cap 3, so that better sealability is realized between the shell 1 and the cover cap 3.
Compared with a lithium metal primary battery, the cylindrical lithium metal secondary battery provided by the embodiment can be charged and discharged for multiple times, has higher load voltage, and has more advantages in the aspects of resource utilization and environmental protection; the device can provide required pressure, can omit an external pressure device, simplifies battery testing and operation environment, reduces battery operation cost and the like. Meanwhile, the metal lithium sheet is used as a negative electrode, and has the functions of an active substance and a current collector, so that a common copper current collector is omitted, the thickness between the diaphragms of the winding electrode group is greatly reduced, and the energy density and the capacity of the battery are greatly improved.
Taking 18650 cylindrical batteries as an example, the nominal voltage of the cylindrical lithium metal secondary battery is increased by 100-200 mV, the battery capacity can be increased to 4095mAh, the weight of the battery is reduced by approximately 20%, the weight energy density is greatly increased, and the 18650-4.1Ah battery reaches a new milestone in capacity, nominal voltage and energy density.
In addition, the embodiment of the utility model also provides an assembly mode of the cylindrical lithium metal secondary battery, which specifically comprises the following steps:
s1: welding the positive electrode 21 with the positive electrode tab 24, and welding the negative electrode 22 with the negative electrode tab;
s2: the positive electrode 21 welded with the positive electrode tab 24 and the negative electrode 22 welded with the negative electrode tab are separated by a diaphragm 23 and are wound to obtain a battery cell electrode group 2;
s3: the battery cell electrode group 2 is arranged in the steel shell 1 and is subjected to rolling groove and welding; and injecting the electrolyte, and packaging to obtain the cylindrical lithium metal secondary battery.
Example 1
The embodiment provides a 18650 cylindrical lithium metal secondary battery, which comprises a shell, a battery cell electrode group arranged in the shell and electrolyte filled in the shell;
the battery core electrode group comprises a winding electrode group and electrode lugs arranged on the winding electrode group;
the winding electrode group is formed by winding a positive electrode, a negative electrode and a diaphragm;
the negative electrode is a metal lithium sheet, and the metal lithium sheet is used as a negative electrode current collector and a negative electrode active material.
The preparation method of the battery comprises the following steps:
(1) Preparing a positive electrode plate: the positive electrode material (NCM 811), the binder (PVDF) and the conductive agent (Super-P) were dissolved in a mass ratio of 96:2:2Uniformly mixing the above materials to obtain slurry, coating the slurry on aluminum foil with a loading capacity of 35mg/cm 2 Drying, rolling and cutting to obtain a positive plate with the thickness of 120 mu m and the length of 950 mm; welding a positive electrode lug;
(2) Preparing a negative electrode plate: a metal lithium sheet with the thickness of 50 mu m is used as a negative electrode, and a negative electrode sheet with the length of 1000mm is obtained after cutting; connecting a negative electrode lug;
(3) Cutting a diaphragm with the length of 1050mm, wherein the diaphragm is a PP/PE/PP composite film;
(4) Separating the positive and negative plates by using a diaphragm, and winding to obtain a battery cell electrode group; calculating the assembly coefficient of the cell electrode group to be 90.5%;
(5) And assembling the battery core electrode into a battery steel shell, and obtaining the complete cylindrical lithium metal secondary battery through the steps of rolling groove, welding, liquid injection (carbonate-based electrolyte), packaging and the like.
The 18650 cylindrical battery of this example had a nominal voltage of 3.8V, a weight of 40g, a gravimetric energy density of 389Wh/kg and a volumetric energy density of 888Wh/L.
Fig. 4 is a charge and discharge curve of 18650 cylindrical lithium metal secondary battery provided in example 1.
Example 2
This embodiment is different from embodiment 1 in that: the fitting coefficients are different.
The length of the positive pole piece and the negative pole piece is adjusted in the embodiment, so that the assembly coefficient is 88.5%.
Example 3
This embodiment is different from embodiment 1 in that: the fitting coefficients are different.
The length of the positive pole piece and the negative pole piece is adjusted in the embodiment, so that the assembly coefficient is 93.2%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A cylindrical lithium metal secondary battery, comprising: the battery cell comprises a shell, a battery cell electrode group arranged in the shell and electrolyte filled in the shell;
the battery cell electrode group comprises a winding electrode group and electrode lugs arranged on the winding electrode group;
the winding electrode group is formed by winding a positive electrode, a negative electrode and a diaphragm;
the negative electrode is a metal lithium sheet, and the metal lithium sheet is used as a negative electrode current collector and a negative electrode active material.
2. The cylindrical lithium metal secondary battery according to claim 1, wherein the assembly coefficient of the cylindrical lithium metal secondary battery is 88.5% to 93.2%.
3. The cylindrical lithium metal secondary battery according to claim 1, wherein the material of the case is steel.
4. The cylindrical lithium metal secondary battery according to claim 1, wherein the thickness of the metallic lithium sheet is 50 μm or less.
5. The cylindrical lithium metal secondary battery according to claim 1, wherein the tab includes a positive electrode tab and a negative electrode tab; the positive electrode tab is an aluminum strip; the negative electrode tab is a nickel strap.
6. The cylindrical lithium metal secondary battery according to claim 3, wherein the positive electrode includes a positive electrode current collector and a positive electrode active material layer provided on a surface of the positive electrode current collector;
the positive electrode active material layer has an areal density of < 40mg/cm 2 。
7. The cylindrical lithium metal secondary battery according to claim 6, wherein the positive electrode active material is any one of lithium cobaltate, ternary material, and lithium iron phosphate material.
8. The cylindrical lithium metal secondary battery according to claim 1, wherein the cylindrical lithium metal secondary battery is any one of a 18650 cylindrical battery, a 14500 cylindrical battery, and a 21700 cylindrical battery.
9. The cylindrical lithium metal secondary battery according to claim 8, wherein the weight energy density of the cylindrical lithium metal secondary battery is equal to or more than 380Wh/kg, and the volume energy density is equal to or more than 850Wh/kL; the capacity is more than 4000mAh.
10. The cylindrical lithium metal secondary battery according to claim 1, wherein the separator is a porous polymer separator;
the thickness of the diaphragm is 20-25 mu m.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222962861.0U CN219591464U (en) | 2022-11-04 | 2022-11-04 | Cylindrical lithium metal secondary battery |
| PCT/CN2023/127975 WO2024093951A1 (en) | 2022-11-04 | 2023-10-30 | Cylindrical lithium metal secondary battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222962861.0U CN219591464U (en) | 2022-11-04 | 2022-11-04 | Cylindrical lithium metal secondary battery |
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| CN219591464U true CN219591464U (en) | 2023-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093951A1 (en) * | 2022-11-04 | 2024-05-10 | 北京恩力动力技术有限公司 | Cylindrical lithium metal secondary battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093951A1 (en) * | 2022-11-04 | 2024-05-10 | 北京恩力动力技术有限公司 | Cylindrical lithium metal secondary battery |
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