CN112490491A - Novel flexible package lithium ion battery and manufacturing method thereof - Google Patents
Novel flexible package lithium ion battery and manufacturing method thereof Download PDFInfo
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- CN112490491A CN112490491A CN202011305114.9A CN202011305114A CN112490491A CN 112490491 A CN112490491 A CN 112490491A CN 202011305114 A CN202011305114 A CN 202011305114A CN 112490491 A CN112490491 A CN 112490491A
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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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- Manufacturing & Machinery (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a novel flexible package lithium ion battery and a manufacturing method thereof, the novel flexible package lithium ion battery comprises a roll core body, the roll core body is formed by stacking and winding a rectangular first diaphragm, a negative plate, a second diaphragm, a positive plate and a third diaphragm, the upper side of the roll core body is wrapped with a first aluminum-plastic film, the lower side of the roll core body is wrapped with a second aluminum-plastic film, the first aluminum-plastic film and the second aluminum-plastic film are connected through hot pressing and sealing to form a sealing edge, a plurality of tooth-shaped grooves formed through die stamping are arranged on the sealing edge, the rectangular positive plate vertically leads out a positive plate lug along the short edge and extends out of the sealing edge, the rectangular negative plate vertically leads out a negative plate lug along the short edge and extends out of the sealing edge, the joint of the positive plate and the positive plate lug is wrapped with a first plate lug glue, the joint of the negative plate and the negative plate lug is, the appearance is more pleasing to the eye, improves assembly efficiency and assembly yields, and unit energy density is high.
Description
Technical Field
The invention relates to the technical field of flexible package lithium ion batteries, in particular to a novel flexible package lithium ion battery and a manufacturing method thereof.
Background
The outer packing materials of the lithium battery are divided into a soft package and a hard package, and compared with hard packing materials such as a steel shell, an aluminum shell and the like, the soft packing material made of the multilayer film has the advantages of light weight, large capacity, high safety, free selection of packing shapes and the like.
The soft package lithium ion battery is small in size and can store more electric quantity, so that the use in daily life is very wide, the soft package lithium ion battery is light in weight and large in capacity, the soft package lithium ion battery can blow air at most and crack under the condition of potential safety hazard, explosion is not easy to occur, and the soft package lithium ion battery is generally arranged inside components and parts which are small in size, high in precision and strict in space limitation, such as a mouse, a mobile phone, a Bluetooth headset and the like.
However, in the prior art, the initial sealing edge in the radial state of the pouch battery needs to be bent to form a bent sealing edge in the axial state, and the bent sealing edge is wrapped on the side face of the pouch battery, wherein in the bending and wrapping process, the circumferential length of the initial sealing edge is reduced, so that a bent fold with a large size can be formed on the bent sealing edge, the sealing of the aluminum-plastic film is greatly stretched, the sealing performance of the sealing is affected, and the risk of liquid leakage is caused.
The soft package lithium ion battery manufactured by adopting the prior art has poor appearance and inconvenient installation, the sealing edge can rebound along the radial direction, the assembly efficiency is low, the assembly yield is low, the occupied installation space is large, and the unit energy density is low.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a novel flexible package lithium ion battery and a manufacturing method thereof, the flexible package lithium ion battery reasonably shrinks the sealing edge, has small influence on an aluminum plastic film, has good sealing performance, does not have the risk of liquid leakage, has more attractive appearance, tidy and regular sealing edge, well controls the diameter rebound of the sealing edge, improves the assembly efficiency and the assembly yield, and has small occupied space and high unit energy density.
In order to achieve the purpose, the invention provides a novel flexible package lithium ion battery, which comprises a roll core body, the winding core body is formed by stacking and winding a rectangular first diaphragm, a rectangular negative plate, a rectangular second diaphragm, a rectangular positive plate and a rectangular third diaphragm, the upper side of the winding core body is wrapped with a first aluminum-plastic film, the lower side is wrapped with a second aluminum-plastic film, the first aluminum-plastic film and the second aluminum-plastic film are connected by hot pressing and sealing to form a sealing edge, the sealing edge is provided with a plurality of tooth-shaped grooves which are punched and formed by a die, the rectangular positive plate is vertically led out a positive pole lug along the short edge and extends out of the sealing edge, the rectangular negative plate is vertically led out of a negative pole lug along the short edge and extends out of the sealed edge, the joint of the positive plate and the positive pole lug is coated with a first lug glue, and the joint of the negative plate and the negative pole lug is coated with a second lug glue.
Preferably, the positive electrode tab is an aluminum-to-nickel electrode tab, the negative electrode tab is a nickel electrode tab, the positive electrode tab is connected with the positive electrode plate through welding, riveting or punching, and the negative electrode tab is connected with the negative electrode plate through welding, riveting or punching.
Preferably, the width of the winding core body is set to be 3 to 8mm, and the length is set to be 50 to 500 mm.
Preferably, the positive electrode tab and the negative electrode tab respectively extend towards two sides of the winding core body and are bent to the same height to be tightly attached to the winding core body.
Preferably, the angle between the positive electrode tab and the negative electrode tab is between 0 and 180 degrees.
Preferably, the first aluminum-plastic film is provided with an arc chamfer, the included angle between the side edge of the first aluminum-plastic film and the axis of the winding core body is 0-60 degrees, the second aluminum-plastic film is provided with an arc chamfer, and the included angle between the side edge of the second aluminum-plastic film and the axis of the winding core body is 0-60 degrees.
Preferably, the sealing edge provided with the plurality of tooth-shaped grooves is bent towards the axial direction of the winding core body, and the included angle between the sealing edge and the axis of the winding core body is 0-45 degrees.
The invention also provides a manufacturing method for manufacturing the novel flexible package lithium ion battery, which comprises the following steps:
step S1: manufacturing a pole piece and welding a pole lug, cutting a rectangular positive pole piece and a rectangular negative pole piece, vertically welding the positive pole lug at one end of the positive pole piece, and vertically welding the negative pole lug at one end of the negative pole piece;
step S2: manufacturing a winding core body, wherein the winding core body is formed by stacking and winding a rectangular first diaphragm, a rectangular negative plate, a rectangular second diaphragm, a rectangular positive plate and a rectangular third diaphragm;
step S3: the tabs are bent, and the positive tab and the negative tab respectively extend towards two sides of the winding core body and are bent to the same height to be tightly attached to the winding core body;
step S4: sealing the aluminum-plastic film, namely placing the winding core body between the first aluminum-plastic film and the second aluminum-plastic film, and sealing and connecting the first aluminum-plastic film and the second aluminum-plastic film through hot-pressing sealing to form a sealing edge;
step S5: injecting, activating and resealing, injecting electrolyte into the roll core body, activating the roll core body, and resealing and packaging;
step S6: the sealing edge is punched and bent, the tooth-shaped grooves are punched on the sealing edge through a die, and the sealing edge provided with a plurality of tooth-shaped grooves is bent axially towards the winding core body.
Compared with the prior art, the invention has the beneficial effects that:
the sealing edge is provided with the plurality of tooth-shaped grooves formed by die punching, the sealing edge provided with the plurality of tooth-shaped grooves is bent towards the axial direction of the winding core body, so that the sealing edge is tightly attached to the winding core body, the sealing edge can be orderly contracted by the tooth-shaped grooves, the appearance of the winding core body is more attractive, the sealing edge is neat and regular, the sealing edge is well controlled to rebound along the radial direction, the assembly efficiency and the assembly yield are improved, meanwhile, the first aluminum plastic film and the second aluminum plastic film are stretched less, the influence on the sealing performance of the sealing edge is small, liquid leakage can be prevented, the uniform tooth-shaped grooves cannot occupy more space in the diameter direction of the battery core, the occupied space is small, the unit energy density is high, and the capacity of the battery is favorably improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a stack of winding core bodies of a novel flexible package lithium ion battery provided by the invention;
FIG. 2 is a schematic diagram of a novel flexible package lithium ion battery provided by the invention after bending an upper tab of a winding core body;
fig. 3 is a schematic view of the whole structure of the novel flexible package lithium ion battery provided by the invention after the roll body is sealed;
FIG. 4 is a sealed front view of a winding core body of a novel flexible package lithium ion battery provided by the invention;
fig. 5 is a schematic top view of a sealing edge of a novel flexible package lithium ion battery provided by the invention after being stamped by a die;
fig. 6 is a schematic structural diagram of the novel flexible package lithium ion battery provided by the invention after the winding core body is shaped and folded.
The figure includes:
1-winding core body, 13-first diaphragm, 12-negative pole piece, 14-second diaphragm, 11-positive pole piece, 15-third diaphragm, 41-first aluminum plastic film, 42-second aluminum plastic film, 5-sealing edge, 51-tooth-shaped groove, 21-positive pole lug, 22-negative pole lug, 31-first pole lug glue and 32-second pole lug glue.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Example one
Referring to fig. 1 to 6, the present invention provides a novel flexible package lithium ion battery, which includes a winding core body 1, as shown in fig. 1 and 2, the winding core body 1 is formed by stacking and winding a rectangular first diaphragm 13, a rectangular negative electrode sheet 12, a rectangular second diaphragm 14, a rectangular positive electrode sheet 11, and a rectangular third diaphragm 15, as shown in fig. 3 and 4, the upper side of the winding core body 1 is wrapped with a first aluminum-plastic film 41, the lower side is wrapped with a second aluminum-plastic film 42, the first aluminum-plastic film 41 and the second aluminum-plastic film 42 are connected by hot-pressing and sealing to form a sealing edge 5, as shown in fig. 5, the sealing edge 5 is provided with a plurality of tooth-shaped grooves 51 formed by die stamping, the sealing edge 5 provided with the plurality of tooth-shaped grooves 51 is bent axially toward the winding core body 1 to enable the sealing edge 5 to be tightly attached to the winding core body 1, the tooth-shaped grooves 51 are provided to enable the sealing, make roll up 1 outward appearance of core body more pleasing to the eye, the sealed limit 3 is neat and regular, also fine control sealed limit 3 along radial bounce-back, improve assembly efficiency and assembly yields, it is less simultaneously to stretch first plastic-aluminum membrane 41 and second plastic-aluminum membrane 42, it is little to the leakproofness influence of sealed limit 3, can prevent the weeping, even profile of tooth recess 51 can not occupy the more space of electric core diameter direction, occupation space is little, unit energy density is high, do benefit to the capacity that promotes the battery.
Rectangular positive plate 11 draws forth anodal utmost point ear 21 perpendicularly along the minor face and stretches out from sealed limit 5, rectangular negative pole piece 12 draws forth negative pole utmost point ear 22 perpendicularly along the minor face and stretches out from sealed limit 5, anodal plate 11 and anodal utmost point ear 21 junction cladding have first utmost point ear to glue 31, negative pole piece 12 and negative pole utmost point ear 22 junction cladding have second utmost point ear to glue 32, anodal utmost point ear 21 and negative pole utmost point ear 22 can syntropy also can be backward, as shown in fig. 3, anodal utmost point ear 21 and negative pole utmost point ear 22 are reverse, can select according to actual conditions, and this embodiment is not limited.
The positive electrode tab 21 is an aluminum-to-nickel electrode tab, the negative electrode tab 22 is a nickel electrode tab, the positive electrode tab 21 is connected with the positive electrode plate 11 through welding or riveting or punching, and the negative electrode tab 22 is connected with the negative electrode plate 12 through welding or riveting or punching.
The width of the roll core body 1 is set to 3-8 mm, and the length is set to 50-500 mm, which can be selected according to practical situation, but not limited by the embodiment.
The positive pole tab 21 and the negative pole tab 22 respectively extend towards the two sides of the roll core body 1 and are bent to the same height to be tightly attached to the roll core body 1, so that the volume of the lithium battery can be reduced, and the unit density of the lithium battery can be increased.
The angle between the positive electrode tab 21 and the negative electrode tab 22 is between 0 ° and 180 °, as shown in fig. 3 to 5, the angle between the positive electrode tab 21 and the negative electrode tab 22 is 180 °, which can be selected according to actual conditions, and is not limited in this embodiment.
The outer package is an aluminum-plastic film outer package, the weight of the whole lithium battery is effectively reduced, the first aluminum-plastic film 41 is provided with an arc chamfer, the included angle between the side edge of the first aluminum-plastic film 41 and the axis of the winding core body 1 is 0-60 degrees, the second aluminum-plastic film 42 is provided with an arc chamfer, and the included angle between the side edge of the second aluminum-plastic film 42 and the axis of the winding core body 1 is 0-60 degrees.
The sealing edge 5 provided with the plurality of tooth-shaped grooves 51 is bent towards the axial direction of the winding core body 1, the volume of the lithium battery can be reduced, the unit density of the lithium battery can be increased, the included angle between the sealing edge 5 and the axis of the winding core body 1 is 0-45 degrees, as shown in figure 6, the included angle between the sealing edge 5 and the axis of the winding core body 1 is 0 degree, so that the positive pole lug 21 and the negative pole lug 22 can have larger freedom degree to adapt to smaller precise components and parts, and the application is wider.
Example two
The second embodiment of the invention provides a manufacturing method for manufacturing a novel flexible package lithium ion battery, which comprises the following steps:
step S1: manufacturing a pole piece and welding a pole lug, cutting a rectangular positive pole piece 11 and a rectangular negative pole piece 12, vertically welding a positive pole lug 21 at one end of the positive pole piece 11, and vertically welding a negative pole lug 22 at one end of the negative pole piece 12;
step S2: manufacturing a winding core body 1, wherein the winding core body 1 is formed by stacking and winding a rectangular first diaphragm 13, a rectangular negative plate 12, a rectangular second diaphragm 14, a rectangular positive plate 11 and a rectangular third diaphragm 15;
step S3: the tabs are bent, and the positive tab 21 and the negative tab 22 respectively extend towards two sides of the winding core body 1 and are bent to the same height to be tightly attached to the winding core body 1;
step S4: sealing the aluminum-plastic film, namely placing the winding core body 1 between the first aluminum-plastic film 41 and the second aluminum-plastic film 42, and sealing and connecting the first aluminum-plastic film 41 and the second aluminum-plastic film 42 through hot-pressing sealing to form a sealing edge 5;
step S5: injecting, activating and resealing, injecting electrolyte into the interior of the roll core body 1, activating the roll core body 1, and resealing and packaging;
step S6: and stamping and bending the sealing edge, namely stamping the tooth-shaped grooves 51 on the sealing edge 5 through a die, and axially bending the sealing edge 5 provided with a plurality of tooth-shaped grooves 51 towards the winding core body 1.
The manufacturing method is simple to operate, greatly improves the manufacturing efficiency of the lithium battery, and improves the production quality of the lithium battery.
In conclusion, the beneficial effects of the invention are as follows:
according to the invention, the sealing edge 5 is provided with the plurality of tooth-shaped grooves 51 formed by die punch forming, the sealing edge 5 provided with the plurality of tooth-shaped grooves 51 is bent towards the roll core body 1 in the axial direction, so that the sealing edge 5 is tightly attached to the roll core body 1, the sealing edge 5 can be orderly contracted by the tooth-shaped grooves 51, the appearance of the roll core body 1 is more attractive, the sealing edge 5 is tidy and regular, the radial rebound of the sealing edge 5 is well controlled, the assembly efficiency and the assembly yield are improved, meanwhile, the first aluminum plastic film 41 and the second aluminum plastic film 42 are stretched less, the influence on the sealing property of the sealing edge 5 is small, liquid leakage can be prevented, the uniform tooth-shaped grooves 51 cannot occupy more spaces in the diameter direction of the battery cell, the occupied space is small, the unit energy density is high, and the capacity of the.
Claims (8)
1. The novel flexible package lithium ion battery is characterized by comprising a winding core body (1), wherein the winding core body (1) is formed by stacking and winding a rectangular first diaphragm (13), a rectangular negative plate (12), a second diaphragm (14), a positive plate (11) and a third diaphragm (15), a first aluminum plastic film (41) is wrapped on the upper side of the winding core body (1), a second aluminum plastic film (42) is wrapped on the lower side of the winding core body, a sealing edge (5) is formed between the first aluminum plastic film (41) and the second aluminum plastic film (42) through hot-pressing sealing connection, a plurality of tooth-shaped grooves (51) formed through die stamping are formed in the sealing edge (5), a positive electrode tab (21) is vertically led out along a short edge of the rectangular positive plate (11) and is led out from the sealing edge (5), a negative electrode tab (22) is led out along a vertical short edge of the rectangular negative plate (12) and is led out from the sealing edge (5), the positive plate (11) and the positive pole lug (21) are coated with a first lug glue (31), and the negative plate (12) and the negative pole lug (22) are coated with a second lug glue (32).
2. The novel flexible package lithium ion battery according to claim 1, wherein the positive electrode tab (21) is an aluminum-to-nickel tab, the negative electrode tab (22) is a nickel tab, the positive electrode tab (21) is connected with the positive electrode tab (11) by welding, riveting or punching, and the negative electrode tab (22) is connected with the negative electrode tab (12) by welding, riveting or punching.
3. The novel flexible package lithium ion battery according to claim 1, wherein the width of the winding core body (1) is set to be 3 to 8mm, and the length is set to be 50 to 500 mm.
4. The novel flexible package lithium ion battery according to claim 1, wherein the positive electrode tab (21) and the negative electrode tab (22) respectively extend towards two sides of the winding core body (1) and are bent to the same height to be tightly attached to the winding core body (1).
5. The novel flexible package lithium ion battery according to claim 1, wherein the angle between the positive electrode tab (21) and the negative electrode tab (22) is between 0 ° and 180 °.
6. The novel flexible package lithium ion battery according to claim 1, wherein the first aluminum-plastic film (41) is provided with a circular chamfer, the included angle between the side edge of the first aluminum-plastic film (41) and the axis of the winding core body (1) is 0-60 degrees, the second aluminum-plastic film (42) is provided with a circular chamfer, and the included angle between the side edge of the second aluminum-plastic film (42) and the axis of the winding core body (1) is 0-60 degrees.
7. The novel flexible package lithium ion battery according to claim 1, wherein the sealing edge (5) provided with the plurality of tooth-shaped grooves (51) is bent axially towards the winding core body (1), and an included angle between the sealing edge (5) and the axis of the winding core body (1) is 0-45 degrees.
8. A manufacturing method for manufacturing a novel flexible package lithium ion battery as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
step S1: manufacturing a pole piece and welding a pole lug, cutting a rectangular positive pole piece (11) and a rectangular negative pole piece (12), vertically welding a positive pole lug (21) at one end of the positive pole piece (11), and vertically welding a negative pole lug (22) at one end of the negative pole piece (12);
step S2: manufacturing a winding core body (1), wherein the winding core body (1) is formed by stacking and winding a rectangular first diaphragm (13), a rectangular negative plate (12), a rectangular second diaphragm (14), a rectangular positive plate (11) and a rectangular third diaphragm (15);
step S3: the tabs are bent, and the positive tab (21) and the negative tab (22) respectively extend towards two sides of the winding core body (1) and are bent to the same height to be tightly attached to the winding core body (1);
step S4: sealing the aluminum-plastic film, namely putting the winding core body (1) between the first aluminum-plastic film (41) and the second aluminum-plastic film (42), and sealing and connecting the first aluminum-plastic film (41) and the second aluminum-plastic film (42) through hot-pressing sealing to form a sealing edge (5);
step S5: injecting, activating and resealing, namely injecting electrolyte into the roll core body (1), activating the roll core body (1), and resealing and packaging;
step S6: the sealing edge is punched and bent, the sealing edge (5) is punched to form the tooth-shaped groove (51) through a die, and the sealing edge (5) provided with a plurality of tooth-shaped grooves (51) is bent axially towards the winding core body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305114.9A CN112490491A (en) | 2020-11-20 | 2020-11-20 | Novel flexible package lithium ion battery and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011305114.9A CN112490491A (en) | 2020-11-20 | 2020-11-20 | Novel flexible package lithium ion battery and manufacturing method thereof |
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| CN112490491A true CN112490491A (en) | 2021-03-12 |
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| CN202011305114.9A Pending CN112490491A (en) | 2020-11-20 | 2020-11-20 | Novel flexible package lithium ion battery and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363641A (en) * | 2021-05-25 | 2021-09-07 | 宁德新能源科技有限公司 | Soft-package battery cell, manufacturing method of shell of soft-package battery cell and power utilization device |
| WO2022155855A1 (en) * | 2021-01-21 | 2022-07-28 | 宁德新能源科技有限公司 | Battery cell, battery, and electric device |
-
2020
- 2020-11-20 CN CN202011305114.9A patent/CN112490491A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022155855A1 (en) * | 2021-01-21 | 2022-07-28 | 宁德新能源科技有限公司 | Battery cell, battery, and electric device |
| CN113363641A (en) * | 2021-05-25 | 2021-09-07 | 宁德新能源科技有限公司 | Soft-package battery cell, manufacturing method of shell of soft-package battery cell and power utilization device |
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