CN106876796B - Battery cell winding needle mechanism and winding method thereof - Google Patents
Battery cell winding needle mechanism and winding method thereof Download PDFInfo
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- CN106876796B CN106876796B CN201710132319.3A CN201710132319A CN106876796B CN 106876796 B CN106876796 B CN 106876796B CN 201710132319 A CN201710132319 A CN 201710132319A CN 106876796 B CN106876796 B CN 106876796B
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- 238000004804 winding Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000007246 mechanism Effects 0.000 title claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910003460 diamond Inorganic materials 0.000 description 5
- 239000010432 diamond Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The application discloses a battery core winding needle mechanism and a battery core winding method, wherein the battery core winding needle mechanism comprises a winding needle seat and a winding needle connected to the winding needle seat, and a winding surface of the winding needle is provided with a lug positioning plane; the winding needle comprises: a left needle body and a right needle body which are symmetrically arranged left and right, and an upper needle body and a lower needle body which are symmetrically arranged up and down; a clamping slot capable of clamping/loosening the diaphragm is formed between the left needle body and the right needle body, and a yielding slot communicated with the clamping slot is formed through both the upper needle body and the lower needle body; the needle rolling seat is provided with: the left needle body and the right needle body are driven to move away from or approach each other along the left-right direction, and the upper needle body and the lower needle body are driven to move away from or approach each other along the up-down direction. When the mechanism is used for winding, the lug is tightly attached to the plane of the winding needle, so that the winding needle is not easy to bend and damage; the length axis of the winding needle is not different, the tension fluctuation is less, the polar plate cannot be vibrated too much, and the production efficiency is improved.
Description
Technical Field
The application relates to the field of lithium battery production equipment, in particular to a battery cell winding needle mechanism and a battery cell winding method.
Background
In the existing lithium battery equipment, a winding needle of a winding machine is an important part of winding of a battery cell, and the shape of the winding needle influences the winding speed of the battery cell and the quality of the battery cell. Most of the current winding machines adopt elliptic and flat diamond winding needle mechanisms. During production, the arc of the shape of the oval winding needle can cause bending damage to the electrode lugs of the battery cell, and the battery cell is flattened and fed after winding, so that wrinkling deformation inside the battery cell is easily caused. The other flat diamond needle winding mechanism can cause large shaking of the pole piece and the diaphragm in the winding process because of larger difference between the short axis and the long axis, and the alignment degree of the battery cell is affected. Moreover, the requirement of the flat diamond coil on tension control is high, tension fluctuation is often caused in the speed increasing process, the inside of the battery cell is deformed, the speed of equipment is difficult to increase, and the production efficiency of the equipment is greatly affected.
Disclosure of Invention
The purpose of the application is that: the novel battery core winding needle mechanism and the method for winding the battery core by adopting the mechanism are provided, and when the battery core winding needle mechanism is used for winding, the tab is tightly attached to the winding needle plane and is not easy to bend and damage; the length axis of the winding needle is little different, the tension fluctuation is less, the polar plate cannot be vibrated too much, and the production efficiency is greatly improved.
In order to achieve the above purpose, the technical scheme of the application is as follows:
The battery core winding needle mechanism comprises a winding needle seat and a winding needle connected to the winding needle seat, wherein a winding surface of the winding needle is provided with a lug positioning plane;
the winding needle comprises:
A left needle body and a right needle body which are symmetrically arranged left and right, and
An upper needle body and a lower needle body which are symmetrically arranged up and down;
A clamping seam capable of clamping/loosening the diaphragm is formed between the left needle body and the right needle body, and a yielding seam communicated with the clamping seam is formed through both the upper needle body and the lower needle body;
the needle winding seat is provided with:
a left and right needle displacement driving device for driving the left and right needle to move away from/approach to each other in the left and right directions, and
And the upper needle body and the lower needle body are driven to move away from/close to each other along the up-down direction.
The application further comprises the following preferable schemes on the basis of the technical scheme:
the upper needle body and the lower needle body are respectively provided with the tab positioning plane.
The left needle body, the right needle body, the upper needle body and the lower needle body are respectively provided with arc-shaped outer surfaces which correspond to each other.
The left needle body displacement driving device and the right needle body displacement driving device are air cylinder assemblies.
The upper needle body displacement driving device and the lower needle body displacement driving device are air cylinder assemblies.
The device also comprises a driving motor which drives the needle rolling seat to rotate so as to enable the needle rolling seat to conduct winding action.
The driving motor is a servo motor.
The lithium battery EV winder comprises the battery core winding needle mechanism with the structure.
The battery core winding method is carried out by adopting the battery core winding needle mechanism with the structure, and comprises the following steps:
s1: penetrating a diaphragm into the relief slit and the clamping slit;
s2: the left needle body and the right needle body are driven to be close to each other by the left needle body displacement driving device and the right needle body displacement driving device, so that the diaphragm is clamped between the left needle body and the right needle body; the distance between the upper needle body and the lower needle body is adjusted to a preset value through the upper needle body and lower needle body displacement driving device; arranging a pole piece with a pole lug at a preset position at the diaphragm;
S3: the winding needle is rotated to wind the diaphragm and the pole piece, and the initial position of the pole piece in the step S2 is accurately controlled to ensure that the tab on the pole piece is always attached to the tab positioning plane in the winding process;
S4: after the winding is finished, the upper needle body and the lower needle body are driven to mutually approach to a preset position by the upper needle body displacement driving device and the lower needle body displacement driving device; meanwhile, the left needle body and the right needle body are driven by the left needle body displacement driving device and the right needle body to be far away from each other, so that the clamped diaphragm is loosened, and the battery core which is wound downwards is extracted along the axial direction of the winding needle.
The battery core winding method of the application further comprises the following preferable schemes on the basis of the technical scheme:
In the step S2, the circular arc outer surfaces on the left needle body, the right needle body, the upper needle body and the lower needle body are located on the same circumferential surface.
The circumferential length of the winding surface of the winding needle in the step S4 is smaller than the circumferential length of the winding surface of the winding needle in the step S3.
In the step S3, the winding needle is rotated by the driving motor, and the rotation speed of the driving motor is adjusted to adapt to the change of the length axis of the winding needle.
The application has the advantages that:
The winding needle of the battery core winding needle mechanism is composed of four movable needle bodies, and a tab positioning plane is formed on a winding surface. The tab can be tightly attached to the tab positioning plane during winding, and is not easy to bend and damage. When in winding, the relative positions of the four movable needle bodies can be adjusted according to the needs, so that the difference of the length axes of the winding needles is not large (more preferably, the winding surface of the winding needles is approximately the standard circumferential surface), the tension fluctuation is less, and the polar plate cannot be greatly dithered. In addition, when in winding, the change of the winding length and the winding axis can be adapted by controlling the speed change of the driving motor, so that the fluctuation of tension is further reduced, the problem of speed increase of the whole machine is solved, and the production efficiency is greatly improved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the battery cell winding needle mechanism according to the embodiment of the application;
FIG. 2 is a schematic view of the winding needle in a winding preparation state according to the embodiment of the present application;
FIG. 3 is a schematic view of a winding needle in the embodiment of the application when the winding is completed and the battery cell is ready to be removed;
wherein: the needle comprises a 1-needle rolling seat, a 2-needle rolling seat, a 201-left needle body, a 202-right needle body, a 203-upper needle body, a 204-lower needle body, a 20 a-tab positioning plane, a 20 b-clamping seam, a 20 c-abdicating seam, a 20 d-arc-shaped outer surface and an A-diaphragm.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. This application may be embodied in many different forms and is not limited to the implementations described in this example. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, in which words of upper, lower, left, right, etc., indicating orientations are used solely for the illustrated structure in the corresponding figures.
However, one skilled in the relevant art will recognize that the detailed description of one or more of the specific details may be omitted, or that other methods, components, or materials may be used. In some instances, some embodiments are not described or described in detail.
Furthermore, the features and aspects described herein may be combined in any suitable manner in one or more embodiments. It will be readily understood by those skilled in the art that the steps or order of operation of the methods associated with the embodiments provided herein may also be varied. Thus, any order in the figures and examples is for illustrative purposes only and does not imply that a certain order is required unless explicitly stated that a certain order is required.
The term "coupled" as used herein, unless indicated otherwise, includes both direct and indirect coupling.
Fig. 1 to 3 show a specific embodiment of the battery core winding needle mechanism of the present application, and the same as the conventional structure, the battery core winding needle mechanism also comprises a winding needle seat 1, a winding needle 2 connected to the winding needle seat 1, and a driving motor for driving the winding needle seat 1 to rotate so as to enable the winding needle 2 to perform winding action. And the winding surface of the winding needle 2 is provided with a tab positioning plane 20a, and the tab positioning plane 20a with a planar structure is used for positioning the tab during winding, so that bending damage of the tab can be prevented, and wrinkling deformation in the battery core can be avoided. The drive motor is preferably a servo motor. In practical application, the battery core winding needle mechanism is generally applied to an EV winding machine of a lithium battery.
The key improvement of this embodiment is that the winding needle 2 is not a traditional elliptic structure or a traditional flat diamond structure, but adopts the smart structural form:
Referring to fig. 2 and 3, the winding needle 2 of the present embodiment includes a left needle body 201, a right needle body 202, an upper needle body 203 and a lower needle body 204 which are of split type structure, wherein the left needle body 201 and the right needle body 202 are symmetrically arranged one by one (both of structure and position are symmetrical), and the upper needle body 203 and the lower needle body 204 are symmetrically arranged one by one (both of structure and position are symmetrical). A clamping slit 20b capable of clamping and unclamping the wound membrane a is formed between the left needle 201 and the right needle 202, and a relief slit 20c communicating with the clamping slit 20b is vertically provided through each of the upper needle 203 and the lower needle 204.
The winding needle holder 1 is provided with: a left and right needle displacement driving device for driving the left and right needles 201 and 202 to be far from/close to each other in the left and right directions, and an up and down needle displacement driving device for driving the upper and lower needles 203 and 204 to be far from/close to each other in the up and down directions. The left-right needle displacement driving device and the upper-lower needle displacement driving device generally adopt air cylinder assemblies, and the main components of the air cylinder assemblies are air cylinders.
The tab positioning plane 20a is provided with four positions, and the upper needle 203 and the lower needle 204 are provided with two positions respectively, which greatly facilitates the arrangement of the tabs, as shown in fig. 2 and 3.
Referring to fig. 1,2 and 3, a method for winding a battery cell using the battery cell winding needle mechanism with the above structure will be briefly described, and the method includes the following steps:
S1: the septum a is inserted into the relief slit 20c of the upper needle 203 and the lower needle 204 and the grip slit 20b between the left needle 201 and the right needle 202.
S2: the left and right needle bodies 201 and 202 are brought close to each other (the grip slit 20b is gradually narrowed) by the left and right needle body displacement driving means, so that the septum a is tightly gripped between the left and right needle bodies 201 and 202. And, the distance between the upper needle 203 and the lower needle 204 is adjusted to a preset value by the upper and lower needle displacement driving device. Moreover, the pole piece with the pole lug is sent to the preset position of the diaphragm by the pole piece manipulator, and the preset position is determined after accurate calculation (the preset position is mainly related to the specific structural form of the winding needle in the winding process, and the distribution position of the pole lug on the pole piece is also required to correspond to the specific structural form of the winding needle in the winding process), so as to ensure that the pole lug on the pole piece is always attached to the pole lug positioning plane 20a in the following step S3.
The preset distance between the upper needle 203 and the lower needle 204 can be flexibly set according to needs, and generally, the preset distance should ensure that the major axis dimension and the minor axis dimension of the winding needle 2 cannot be too different, that is, the distance between the radial outer surfaces of the upper needle 203 and the lower needle 204 is substantially equal to the distance between the radial outer surfaces of the left needle 201 and the right needle 202 (the winding surface of the winding needle 2 is substantially a cylindrical surface, as shown in fig. 2), so as to avoid the problems of the conventional flat diamond winding needle (see the description in the background section, such as large winding tension fluctuation). In particular, in the present embodiment, the circular arc outer surfaces 20d of the left needle 201, the right needle 202, the upper needle 203 and the lower needle 204 are formed on the same circumferential surface, so as to minimize the fluctuation of the winding tension during the winding. At this time, the winding needle 2 is in the state shown in fig. 2.
S3: the winding needle 2 is driven to rotate by a driving motor to wind the diaphragm a. Since the initial position of the pole piece in the above step S2 (i.e., the preset position in the above step S2) is specifically set, it is ensured that the tab on the pole piece is always attached to the tab positioning plane 20a during the winding process. The tabs are attached to the plane, so that bending damage of the tabs in the winding process can be avoided.
Considering that the winding surface of the winding needle 2 is not a completely standard circumferential surface (including a planar structure portion having a long and short axis thereon), there is a problem of tension fluctuation if winding is performed at the same rotational speed. Therefore, in this step S3, the rotation speed (variable rotation speed control) of the driving motor can be adjusted to accommodate the change of the long and short axes of the winding needle 2, so as to further reduce the fluctuation of the winding tension.
S4: after the battery core is attached to the tail glue after winding is finished, the left needle body 201 and the right needle body 202 are driven to be away from each other (to a preset position) by the left needle body displacement driving device and the right needle body displacement driving device so as to loosen the clamped diaphragm A. While the left needle 201 and the right needle are far away from each other, the upper needle 203 and the lower needle 204 are driven by the upper and lower needle displacement driving device to approach each other to a preset position, at this time, the winding needle 2 is in the state shown in fig. 3, the winding surface of the winding needle 2 is approximately elliptical, and the wound battery core is also approximately elliptical, so that the needle extraction is facilitated, that is, the battery core wound down along the axial direction of the winding needle 2 is also facilitated.
In order to further facilitate the extraction of the battery cell, the circumferential length of the winding surface of the winding needle 2 in the step S4 is smaller than the circumferential length of the winding surface of the winding needle in the step S3.
The foregoing is a further detailed description of the application in connection with specific embodiments, and it is not intended that the application be limited to such description. It will be apparent to those skilled in the art that several simple deductions or substitutions can be made without departing from the spirit of the application.
Claims (6)
1. The battery core winding method is characterized by adopting a battery core winding needle mechanism, wherein the battery core winding needle mechanism comprises a winding needle seat (1) and a winding needle (2) connected to the winding needle seat, and a winding surface of the winding needle (2) is provided with a lug positioning plane (20 a); the winding needle (2) comprises:
a left needle body (201) and a right needle body (202) which are symmetrically arranged left and right, and
An upper needle body (203) and a lower needle body (204) which are symmetrically arranged up and down; the upper needle body (203) and the lower needle body (204) are respectively provided with the lug positioning plane (20 a);
A clamping slit (20 b) capable of clamping/loosening the diaphragm (A) is formed between the left needle body (201) and the right needle body (202), and a yielding slit (20 c) communicated with the clamping slit (20 b) is formed through both the upper needle body (203) and the lower needle body (204);
The left needle body (201), the right needle body (202), the upper needle body (203) and the lower needle body (204) are respectively provided with arc-shaped outer surfaces (20 d) which are mutually corresponding;
The needle rolling seat (1) is provided with:
a left and right needle displacement driving device for driving the left needle (201) and the right needle (202) to move away from/approach to each other along the left and right directions, and
An upper and lower needle displacement driving device for driving the upper needle (203) and the lower needle (204) to move away from/approach each other in the up-down direction;
the winding needle (2) can be adjusted between a circular structure and an elliptical structure;
The method comprises the following steps:
S1: penetrating a membrane (a) into the relief slit (20 c) and the clamping slit (20 b);
S2: the left needle body (201) and the right needle body (202) are driven to be close to each other by the left needle body displacement driving device and the right needle body displacement driving device, so that the diaphragm (A) is clamped between the left needle body (201) and the right needle body (202); the distance between the upper needle body (203) and the lower needle body (204) is adjusted to a preset value through the upper needle body displacement driving device and the lower needle body displacement driving device; arranging a pole piece with a pole lug at a preset position at the diaphragm; the circular arc-shaped outer surfaces (20 d) on the left needle body (201), the right needle body (202), the upper needle body (203) and the lower needle body (204) are positioned on the same circumferential surface;
s3: rotating the winding needle (2) to wind the diaphragm (A) and the pole piece, and ensuring that the tab on the pole piece is always attached to the tab positioning plane (20 a) in the winding process by precisely controlling the initial position of the pole piece in the step S2;
S4: after the winding is finished, the upper needle body (203) and the lower needle body (204) are driven to mutually approach to a preset position by the upper needle body displacement driving device and the lower needle body displacement driving device; simultaneously, the left needle body (201) and the right needle body (202) are driven to be far away from each other by the left needle body displacement driving device and the right needle body displacement driving device so as to loosen the clamped diaphragm (A), and the battery core which is wound up downwards is extracted along the axial direction of the winding needle (2).
2. The method of claim 1, wherein the left and right needle displacement driving means and the up and down needle displacement driving means are cylinder assemblies.
3. The cell winding method according to claim 1, further comprising a driving motor for driving the winding needle holder (1) to rotate so as to enable the winding needle (2) to perform winding action.
4. The cell winding method according to claim 1, characterized in that the circumferential length of the winding surface of the winding needle (2) in the step S4 is smaller than the circumferential length of the winding surface of the winding needle (2) in the step S3.
5. A method according to claim 3, characterized in that in step S3, the rotating of the winding needle (2) is driven by the driving motor, and the change of the length axis of the winding needle (2) is adapted by adjusting the rotation speed of the driving motor.
6. A lithium battery EV winding machine characterized by comprising a battery winding needle mechanism employed in the battery winding method as claimed in any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710132319.3A CN106876796B (en) | 2017-03-07 | 2017-03-07 | Battery cell winding needle mechanism and winding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710132319.3A CN106876796B (en) | 2017-03-07 | 2017-03-07 | Battery cell winding needle mechanism and winding method thereof |
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| CN106876796B true CN106876796B (en) | 2024-05-28 |
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| CN107968217B (en) * | 2017-11-27 | 2024-01-02 | 无锡先导智能装备股份有限公司 | Battery cell blanking method, battery cell blanking device and winding equipment |
| CN108550894B (en) * | 2018-05-14 | 2021-07-09 | 大族激光科技产业集团股份有限公司 | Winding needle device of winding machine |
| CN108649273B (en) * | 2018-05-14 | 2020-07-14 | 大族激光科技产业集团股份有限公司 | Winding needle device of winding machine |
| CN108615925B (en) * | 2018-05-14 | 2020-11-17 | 大族激光科技产业集团股份有限公司 | Winding needle device of winding machine |
| CN109037720B (en) * | 2018-06-28 | 2020-07-28 | 大族激光科技产业集团股份有限公司 | Winding needle device of winding machine |
| CN109193040A (en) * | 2018-09-07 | 2019-01-11 | 中兴高能技术有限责任公司 | A kind of winding device and winding method of winding battery |
| CN109524723B (en) * | 2018-10-10 | 2020-08-21 | 中兴高能技术有限责任公司 | Method for manufacturing winding core and winding core |
| CN113690492B (en) * | 2020-05-19 | 2024-08-23 | 东莞市雅康精密机械有限公司 | Needle mechanism is rolled up to little cylinder lithium cell electricity core |
| CN111916846A (en) * | 2020-08-25 | 2020-11-10 | 深圳吉阳智能科技有限公司 | Utmost point ear guider |
| CN113270630B (en) * | 2021-07-16 | 2021-11-23 | 江苏时代新能源科技有限公司 | Winding needle, battery cell manufacturing equipment and battery cell manufacturing method |
| CN114284573B (en) * | 2022-03-04 | 2022-06-28 | 东莞市泽源机械有限公司 | Roll up needle mechanism and lithium cell coiling equipment |
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| JP2010235301A (en) * | 2009-03-31 | 2010-10-21 | Honda Motor Co Ltd | Device of manufacturing flat winding body |
| CN101950816A (en) * | 2010-09-21 | 2011-01-19 | 奇瑞汽车股份有限公司 | Square power lithium ion battery cell and manufacturing method thereof |
| CN103811794A (en) * | 2012-11-06 | 2014-05-21 | 三星Sdi株式会社 | Winding apparatus for electrode of rechargeable battery and winding method using thereof |
| JP2014133652A (en) * | 2012-12-14 | 2014-07-24 | Kaido Seisakusho:Kk | Winding core and method of producing wound element |
| KR20150082852A (en) * | 2014-01-08 | 2015-07-16 | 주식회사 엘지화학 | Mandrel structure for fabricating electrode assembly of prismatic secondary battery and method for fabricating electrode assembly using the same |
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