CN111446480A - Preparation method of battery cell of energy storage device and battery cell - Google Patents
Preparation method of battery cell of energy storage device and battery cell Download PDFInfo
- Publication number
- CN111446480A CN111446480A CN202010358807.8A CN202010358807A CN111446480A CN 111446480 A CN111446480 A CN 111446480A CN 202010358807 A CN202010358807 A CN 202010358807A CN 111446480 A CN111446480 A CN 111446480A
- Authority
- CN
- China
- Prior art keywords
- winding
- electrode sheet
- negative
- negative electrode
- positive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
Abstract
The invention discloses a preparation method of a battery cell of an energy storage device and the battery cell, wherein any one of a positive plate or a negative plate is clamped between two isolating membranes; disposing the other of the positive electrode tab and the negative electrode tab outside one of the separators; winding the positive plate, the negative plate and the same ends of the two isolating films, and winding the positive plate, the negative plate and the two isolating films on a winding needle to form a spiral winding structure; at least one of the separators has an extension portion protruding from ends of the positive electrode tabs and the negative electrode tabs, the extension portion being fixed to a sidewall of the winding structure; and drawing the winding needle away from the winding structure to form a through hole in the middle of the winding structure. In one embodiment of the invention, the electric connection part and the shell are welded through the space in the through hole, so that the problem that the safety of the energy storage device is influenced by bending of the electric connection part can be avoided without arranging an overlong electric connection part.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a preparation method of a battery cell of an energy storage device and the battery cell.
Background
The conventional energy storage device generally includes a casing and a battery cell disposed inside the casing. In the case where the battery cell is provided inside the case, it is necessary to weld the electrical connection portion on the battery cell to the case. Welding the electrical connection portion located at the bottom requires setting the electrical connection portion to be longer than the length of the casing, so that the electrical connection portion and the casing are welded together in the case where the battery cell is placed outside the casing. After the battery cell is placed in the shell, the welded electric connection part can be bent, the structural strength of the electric connection part is affected, and the problem that the bent part of the electric connection part is in conduction short circuit with other structures can be caused. Therefore, in the energy storage device in the prior art, the electric connection part is bent, and the safety of the energy storage device is affected.
Therefore, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a new technical scheme of a preparation method of a battery cell of an energy storage device.
According to a first aspect of the present invention, there is provided a method of manufacturing a cell of an energy storage device,
sandwiching either the positive plate or the negative plate between two separators;
disposing the other of the positive electrode tab and the negative electrode tab outside one of the separators;
winding the positive plate, the negative plate and the same ends of the two isolating films, and winding the positive plate, the negative plate and the two isolating films on a winding needle to form a spiral winding structure;
at least one of the separators has an extension portion protruding from ends of the positive electrode tabs and the negative electrode tabs, the extension portion being fixed to a sidewall of the winding structure;
and drawing the winding needle away from the winding structure to form a through hole in the middle of the winding structure.
Optionally, in the axial direction of the winding structure, the size of the negative electrode sheet is at least 0.1mm larger than the size of the positive electrode sheet.
Optionally, in the axial direction of the winding structure, the size of each of the two separation films is at least 0.5mm larger than that of the negative electrode sheet.
Optionally, in the axial direction of the winding structure, the portion of the separator film larger than the size of the negative electrode sheet forms bulges at both ends of the winding structure, and the bulges are inclined to cover the positive electrode sheet and the negative electrode sheet at both ends.
Optionally, in the circumferential direction of the winding structure, the size of the negative electrode sheet is at least 3mm larger than that of the positive electrode sheet.
Optionally, the aperture of the through hole is 0.5mm-3.0 mm.
Optionally, the positive electrode plate and the negative electrode plate are respectively provided with an electrical connection portion, one of the electrical connection portions protrudes out of one axial end portion of the winding structure, the other electrical connection portion protrudes out of the other end portion of the winding structure, and an insulating layer is arranged between the electrical connection portion and the corresponding end portion.
Optionally, after withdrawing the winding needle, a cylindrical core is disposed within the through-hole, the cylindrical core having an inner bore.
Optionally, a cylindrical core is sleeved over the winding needle before winding the laminated structure along the winding needle.
Optionally, the winding needle is cylindrical, elliptic cylindrical, prismatic or rectangular.
Optionally, at least one of the two separators protrudes from the positive electrode tab and the negative electrode tab at the beginning of the winding structure.
According to a second aspect of the invention, a battery cell of an energy storage device is provided, which comprises a positive plate, a negative plate and two isolation films, wherein one of the positive plate and the negative plate is located between the two isolation films, the other is located outside one of the isolation films, the positive plate, the negative plate and the two isolation films form a spiral winding structure, and a through hole is formed in the middle of the winding structure.
According to an embodiment of this disclosure, weld electric connection portion and casing through the space in the through-hole, need not set up the electric connection portion of overlength, can avoid electric connection portion to buckle the problem that influences energy memory security.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a device before winding in a method for manufacturing a battery cell of an energy storage device in an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of an end face of a winding structure in which a winding needle is not drawn away after a spiral winding structure is formed after a battery cell of an energy storage device is wound in an embodiment of the disclosure.
Fig. 3 is a schematic structural diagram of an end face of a winding structure of a battery cell after a winding needle is withdrawn in an embodiment of the present disclosure.
Fig. 4 is a partial schematic view of a cross-sectional view a-a of fig. 3.
Fig. 5 is a schematic structural diagram of an energy storage device in an embodiment of the present disclosure in which a battery cell is wound with an insulating adhesive tape.
In the figure, 1 is a positive electrode sheet, 2 is a negative electrode sheet, 3 is a separation film, 31 is an extension part, 32 is a projection part, 4 is a winding needle, 5 is a through hole, and 6 is an insulating adhesive paper.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In one embodiment of the present disclosure, a method for preparing a battery cell of an energy storage device is provided,
sandwiching either the positive electrode sheet 1 or the negative electrode sheet 2 between two separators 3;
disposing the other of the positive electrode tab 1 and the negative electrode tab 2 outside one of the separators 3;
winding the positive plate 1, the negative plate 2 and the two isolating films 3 from the same end, and winding the positive plate, the negative plate and the two isolating films on a winding needle 4 to form a spiral winding structure;
at least one of the separators 3 has an extension 31 protruding from the ends of the positive electrode tab 1 and the negative electrode tab 2, the extension 31 being fixed to the side wall of the winding structure;
and drawing the winding needle 4 away from the winding structure to form a through hole 5 in the middle of the winding structure.
In this embodiment, as shown in fig. 1, the positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 may be provided in a laminated structure before winding, and then winding may be performed. The end of the wound structure after winding is the structure shown in fig. 2. As shown in fig. 3, the winding needle 4 is drawn out to form a through hole 5.
The middle part of the battery cell of the energy storage device prepared by the preparation method is provided with a through hole 5. In the process of arranging the battery cell in the energy storage device shell, the battery cell is firstly arranged in the shell, and the electric connection part of the battery cell is welded with the shell through the through hole 5. The welding process may be such that the welding position is projected into the through-hole 5 and moved along the through-hole 5 to a welding target position of the electrical connection portion and the case to perform welding. Such electric core structure and welding mode need not set up the electric connection portion of overlength, can directly set up the electric connection portion structure that agrees with the welding position, and welding back electric connection portion also can not take place to buckle etc. and influence welding quality's problem, and electric connection portion is more firm to the influence to energy memory's security has been avoided.
In the process of welding the electric connection part, a bottom resistance welding mode can be adopted, single-needle resistance welding can be adopted, and the single-needle resistance welding can be more easily stretched into the through hole 5 for welding.
The extension part 31 is fixed on the side wall of the winding structure, so that the winding structure can be protected at the side wall, and the positive plate 1 or the negative plate 2 of the winding structure on the side wall is prevented from being conducted with the shell of the energy storage device. One isolation diaphragm 3 may extend out of the extension 31, or both isolation diaphragms 3 may extend out of the extension 31, and the extension 31 surrounds at least one circle around the side wall.
In one example, the separation film 3 may be an insulating material capable of passing lithium ions. Insulation is formed between the positive electrode sheet 1 and the negative electrode sheet 2, and insulation is formed between the winding structure and the case.
In one example, the two isolation films 3 may be formed by bending one isolation film 3. For example, after a part of the separator 3 is disposed between the positive electrode sheet 1 and the negative electrode sheet 2, the other part is bent to the outside of the positive electrode sheet 1 or the negative electrode sheet 2. Thereby forming a structure in which the positive electrode sheet 1 or the negative electrode sheet 2 is sandwiched by the bent separator 3.
In one embodiment, the size of the negative electrode tab 2 is at least 0.1mm larger than the size of the positive electrode tab 1 in the axial direction of the winding structure.
Under the condition that the battery core works in the energy storage device, the negative electrode material on the negative electrode plate 2 and the positive electrode material on the positive electrode plate 1 act to release electric energy or store the electric energy. When the size of the negative electrode sheet 2 is greater than or equal to that of the positive electrode sheet 1 in the axial direction of the winding structure, sufficient negative electrode material can be ensured to enable the positive electrode material to fully exert the charge and discharge capacity, and the utilization rate of the positive electrode sheet 1 is improved. The positive electrode material in the positive electrode sheet 1 is generally copper, the negative electrode material in the negative electrode sheet 2 is generally aluminum, and the cost of the positive electrode sheet 1 is higher. The utilization rate of the positive plate 1 in the battery cell is improved, so that the material with higher cost ratio in the battery cell is effectively utilized. Indirectly reducing the waste of the cost of the battery cell. The size of the negative electrode plate 2 is at least 0.1mm larger than that of the positive electrode plate 1, so that the amount of the negative electrode plate 2 required by the positive electrode plate 1 can be fully utilized.
For example, in the cell of the energy storage device, the positive electrode active material provided on the positive electrode sheet 1 is lithium. In the process of charging and discharging the battery core of the energy storage device, the process that the positive plate 1 releases lithium ions, the lithium ions pass through the isolating membrane 3 and reach and are embedded into the negative plate 2 is included. In this process, if the space for receiving lithium ions on the negative electrode sheet 2 is not enough, the problem of lithium ion accumulation may occur, which may cause the potential explosion hazard of the energy storage device, and may lead to direct explosion seriously. In this embodiment, by setting the size of the negative electrode tab 2 to be larger than the size of the positive electrode tab 1 by at least 0.1mm in the axial direction of the winding structure. Enough space can be provided to receive lithium ions, and explosion hidden danger of an energy storage device caused by accumulation of the lithium ions is avoided.
In one example, the size of the negative electrode tab 2 is greater than the size of the positive electrode tab 1 by 0.1mm to 0.5mm in the axial direction of the winding structure.
Within the size difference, the negative plate 2 not only meets the requirement of the positive plate 1 for sufficient charge and discharge, but also does not increase the volume of the negative plate 2 too much, and under the same energy density, the problem that the negative plate 2 causes the overlarge volume of the battery cell is avoided.
In one embodiment, the size of the negative electrode tab 2 is at least 3mm greater than the size of the positive electrode tab 1 in the circumferential direction of the winding structure.
In this embodiment as well, the dimension of the negative electrode sheet 2 in the circumferential direction of the wound structure is larger than the dimension of the positive electrode sheet 1 by 3mm or more, and sufficient charge and discharge performance of the positive electrode sheet 1 can be ensured. The utilization rate of the positive plate 1 is improved, and the waste of the cell cost is reduced.
In one embodiment, the size of each of the two separators 3 is at least 0.5mm larger than the size of the negative electrode tab 2 in the axial direction of the winding structure.
In this embodiment, the separator 3 is larger than the negative electrode sheet 2 in the axial dimension of the wound structure, so that the separator 3 is surely sandwiched between the positive electrode sheet 1 and the negative electrode sheet 2 in the wound structure. In such a structure, the formation of a short circuit between the positive plate 1 and the negative plate 2 can be avoided, and the safety of the battery cell is improved. The size of the isolation film 3 is at least 0.5mm larger than that of the negative plate 2, so that the insulation effect between the positive plate 1 and the negative plate 2 can be effectively achieved.
In one embodiment, as shown in fig. 4, the portions of the separator 3 larger than the size of the negative electrode tab 2 form projections 32 at both end portions of the wound structure in the axial direction of the wound structure, and the projections 32 are inclined to cover the positive electrode tab 1 and the negative electrode tab 2 at both end portions.
In this embodiment, the protrusion 32 covers the positive electrode sheet 1 and the negative electrode sheet 2 at the end of the winding structure after being tilted, and an insulating film is formed at the position of the positive electrode sheet 1 and the negative electrode sheet 2 at the end of the winding structure, so that the insulating property of the covered end of the winding structure is improved, and the safety performance of the battery cell is improved.
In one embodiment, the aperture of the through hole 5 is 0.5mm-3.0 mm.
The through hole can make things convenient for the welding of electric connection portion on the electric core and casing, and through hole 5 in the aperture range of this embodiment can satisfy welding process's space demand, can not make the space that electric core occupy too big simultaneously.
In order to secure the size of the through-hole 5 within this range, the radial size of the winding needle may be set to 0.5mm to 3.0 mm. The size of the wound through-hole 5 can meet the range requirements in this embodiment.
In one embodiment, the positive electrode tab 1 and the negative electrode tab 2 are respectively provided with an electrical connection portion, one of the electrical connection portions protrudes from one axial end portion of the winding structure, the other electrical connection portion protrudes from the other axial end portion of the winding structure, and an insulating layer is arranged between the electrical connection portion and the corresponding end portion.
In this embodiment, an insulating layer is arranged between the electrical connection portion and the corresponding end portion, so that the electrical connection portion can be prevented from being in contact conduction with different pole pieces of the positive pole piece 1 and the negative pole piece 2 to form a short circuit, and the safety of the battery cell is improved.
In one embodiment, after withdrawing the winding needle 4, a cylindrical core having an inner bore is provided within the through-hole 5.
In this embodiment, the cylindrical core column is arranged in the through hole 5, so that the through hole 5 in the middle of the winding structure is supported, the winding structure is prevented from loosening into the through hole after the winding needle 4 is drawn out, and the firmness of the winding structure is improved. And at the in-process of the electric connection portion on the welding electric core, can stretch into the welding needle through the hole of tube-shape stem and weld to outside the casing need be arranged electric core in to the welding electric connection portion among the prior art, put into the electric connection portion problem of buckling that the casing caused with electric core after having welded.
In one embodiment, a cylindrical core is sleeved over the winding needle 4 before winding the laminated structure along the winding needle 4.
In this embodiment, the cylindrical stem is sleeved on the winding needle 4 before winding, and only the winding needle needs to be taken out after winding. In the step, the cylindrical core column is easier to be left in the through hole 5 in the middle of the winding structure, and the step of putting the cylindrical core column into the winding structure after being drawn out is saved.
In one embodiment, the winding needle 4 has a cylindrical, elliptic cylindrical, prismatic or rectangular parallelepiped shape. The winding needle 4 is used for winding the battery cell, and the winding needle 4 can wind the battery cell into a winding structure. In the shape of the winding needle 4 in this embodiment, it is possible to effectively wind a winding structure forming a spiral shape and form the through-hole 5 after the winding needle 4 is withdrawn. The shape of the winding needle 4 determines the shape of the wound winding structure, for example, a cylindrical winding needle winds a cylindrical winding structure.
In an example, the winding needle 4 can be made of tungsten steel, the strength of the tungsten steel is high, the prepared winding needle 4 cannot deform in the winding process, the problem of deformation of a winding structure caused by deformation of the winding needle can be avoided, and the coaxiality of the battery cell cannot be reduced. And the part of the winding needle 4 for winding can be prepared to be in the diameter range of 0.5mm-3.0mm, so that the energy density of the battery cell is not influenced under the condition that the formed through hole 5 meets the welding condition.
The winding needle 4 may be provided with a progressive stepped shaft structure, so that the structural part for winding meets the size requirement, and the progressive stepped shaft can provide enough structural strength.
In one example, the core is wound using two winding needles 4 to form a winding structure. The two winding needles 4 are oppositely arranged, the part of the winding needle 4 for winding the battery core is in a semi-cylindrical shape, and the semi-cylindrical shapes on the two winding needles 4 are matched to form a cylindrical shape. After the winding is successful, the two winding needles 4 are respectively pulled away from the two end parts of the winding structure, so that the problem that the winding core is brought out due to the fact that the single winding needle 4 is pulled away from one direction can be avoided.
The ends of the two winding needles 4 can be chamfered, and the chamfered surfaces play a role in guiding the two winding needles 4 in the process of matching to form a cylindrical structure.
In one embodiment, at least one of the two separators 3 protrudes from the positive electrode tab 1 and the negative electrode tab 2 at the beginning of the winding structure. The starting end of the winding structure is located in the through hole 5 after the winding structure is formed, the isolating film 3 protrudes out of the positive plate 1 and the negative plate 2 at the starting end to form insulation at the starting end, the starting ends of the positive plate 1 and the negative plate 2 in the through hole 5 are prevented from being conducted with other structures, and the safety of the battery cell is improved.
In one embodiment, as shown in fig. 5, an insulating tape 6 is fixed on the sidewall of the winding structure, and the insulating tape 6 is fixed to the extension portion 31. The insulating gummed paper 6 can avoid the problem of electric core exposure that the barrier film 3 drops and leads to after the lateral wall of winding structure forms fixedly to extension 31. The insulating effect of the insulating layer formed by the isolation film 3 is reinforced. Moreover, the insulating gummed paper 6 also has insulating property, so that a plurality of insulating layers can be provided for the battery cell, and the insulating property of the battery cell is improved. The insulating adhesive paper 6 may be fixed only at the end of the extension 31, or may be provided at least once around the side wall to surround the separator 3.
In one embodiment of the invention, a battery cell of an energy storage device is provided, and comprises a positive plate 1, a negative plate 2 and two separation films 3, wherein one of the positive plate 1 and the negative plate 2 is located between the two separation films 3, the other is located outside one of the separation films 3, the positive plate 1, the negative plate 2 and the two separation films 3 form a spiral winding structure, and a through hole 5 is formed in the middle of the winding structure.
In this example, as shown in fig. 2 and 3, the positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 were wound to form a spiral winding structure. A through hole 5 is formed at the position of the winding needle 4. Set up the in-process in energy memory's the casing with this electric core, through the electric connection portion that sets up on this through-hole 5 welding electric core, need not set up the electric connection portion of overlength, avoid the electric connection portion among the energy memory to take place to buckle the problem that influences electric connection portion structural strength. And, do not need to locate the electricity core in the casing after welding electric connection portion, simplified the step of equipment energy memory.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A preparation method of an electric core of an energy storage device is characterized in that,
sandwiching either the positive plate or the negative plate between two separators;
disposing the other of the positive electrode tab and the negative electrode tab outside one of the separators;
winding the positive plate, the negative plate and the same ends of the two isolating films, and winding the positive plate, the negative plate and the two isolating films on a winding needle to form a spiral winding structure;
at least one of the separators has an extension portion protruding from ends of the positive electrode tabs and the negative electrode tabs, the extension portion being fixed to a sidewall of the winding structure;
and drawing the winding needle away from the winding structure to form a through hole in the middle of the winding structure.
2. The production method according to claim 1, wherein the dimension of the negative electrode sheet is at least 0.1mm larger than the dimension of the positive electrode sheet in the axial direction of the wound structure.
3. A production method according to claim 1, wherein the dimensions of both of the separators are larger than the dimension of the negative electrode sheet by at least 0.5mm in the axial direction of the wound structure.
4. A production method according to claim 3, wherein, in the axial direction of the wound structure, the portion of the separator that is larger than the dimension of the negative electrode sheet forms projections at both end portions of the wound structure, the projections being inclined so as to cover the positive electrode sheet and the negative electrode sheet at both end portions.
5. The production method according to claim 1, wherein the size of the negative electrode sheet is at least 3mm larger than the size of the positive electrode sheet in the circumferential direction of the wound structure.
6. The production method according to claim 1, wherein the aperture of the through-hole is 0.5mm to 3.0 mm.
7. The manufacturing method according to claim 1, wherein the positive electrode sheet and the negative electrode sheet are respectively provided with an electrical connection portion, one of the electrical connection portions protrudes from one end portion of the winding structure in the axial direction, the other electrical connection portion protrudes from the other end portion of the winding structure, and an insulating layer is provided between the electrical connection portion and the corresponding end portion.
8. The production method according to claim 1, wherein a cylindrical core having an inner hole is provided in the through hole after the winding needle is withdrawn.
9. The production method according to claim 1, wherein a cylindrical core is fitted over the winding needle before the laminated structure is wound around the winding needle.
10. The method of claim 1, wherein the winding needle is cylindrical, elliptic cylindrical, prismatic or rectangular.
11. The production method according to claim 1, wherein at least one of the two separators protrudes from the positive-electrode sheet and the negative-electrode sheet at a start of the wound structure.
12. The utility model provides an energy memory's electric core, its characterized in that includes positive plate, negative pole piece and two barrier films, one of positive plate and negative pole piece is located two between the barrier film, another is located one of them barrier film outside, positive plate the negative pole piece with two barrier films form spiral helicine winding structure the middle part of winding structure forms the through-hole.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358807.8A CN111446480A (en) | 2020-04-29 | 2020-04-29 | Preparation method of battery cell of energy storage device and battery cell |
| PCT/CN2020/136754 WO2021218188A1 (en) | 2020-04-29 | 2020-12-16 | Manufacturing method for cell of energy storage apparatus, and cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358807.8A CN111446480A (en) | 2020-04-29 | 2020-04-29 | Preparation method of battery cell of energy storage device and battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111446480A true CN111446480A (en) | 2020-07-24 |
Family
ID=71653588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010358807.8A Pending CN111446480A (en) | 2020-04-29 | 2020-04-29 | Preparation method of battery cell of energy storage device and battery cell |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111446480A (en) |
| WO (1) | WO2021218188A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218188A1 (en) * | 2020-04-29 | 2021-11-04 | 广东微电新能源有限公司 | Manufacturing method for cell of energy storage apparatus, and cell |
| WO2022037284A1 (en) * | 2020-08-19 | 2022-02-24 | 广东微电新能源有限公司 | Battery cell of energy storage device and energy storage device |
| CN114447342A (en) * | 2022-04-08 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| WO2022228193A1 (en) * | 2021-04-28 | 2022-11-03 | 广东微电新能源有限公司 | Energy storage device and electronic apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114824287B (en) * | 2022-05-09 | 2024-05-24 | 江苏正力新能电池技术有限公司 | Electric core, battery module and battery package |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280399A (en) * | 1999-07-09 | 2001-01-17 | 松下电器产业株式会社 | Non-aqueous eletrolyte battery |
| CN104966852A (en) * | 2015-07-07 | 2015-10-07 | 李震祺 | Square lithium ion battery winding cell and manufacturing method for same |
| CN204991777U (en) * | 2015-10-08 | 2016-01-20 | 庄新国 | Long cycle life's energy storage device |
| CN105428698A (en) * | 2015-12-09 | 2016-03-23 | 惠州亿纬锂能股份有限公司 | Rolling needle and application method thereof |
| CN207474594U (en) * | 2017-08-04 | 2018-06-08 | 深圳市沃特玛电池有限公司 | A kind of lithium ion cylinder battery |
| US20190356022A1 (en) * | 2017-02-01 | 2019-11-21 | Murata Manufacturing Co., Ltd. | Method for manufacturing battery, battery, and winding device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157754A (en) * | 2011-03-15 | 2011-08-17 | 深圳市赢合科技有限公司 | Method for winding battery cell of lithium ion |
| CN202817039U (en) * | 2012-10-15 | 2013-03-20 | 罗得电子机械股份有限公司 | Lithium battery cell |
| CN111446480A (en) * | 2020-04-29 | 2020-07-24 | 广东微电新能源有限公司 | Preparation method of battery cell of energy storage device and battery cell |
-
2020
- 2020-04-29 CN CN202010358807.8A patent/CN111446480A/en active Pending
- 2020-12-16 WO PCT/CN2020/136754 patent/WO2021218188A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280399A (en) * | 1999-07-09 | 2001-01-17 | 松下电器产业株式会社 | Non-aqueous eletrolyte battery |
| CN104966852A (en) * | 2015-07-07 | 2015-10-07 | 李震祺 | Square lithium ion battery winding cell and manufacturing method for same |
| CN204991777U (en) * | 2015-10-08 | 2016-01-20 | 庄新国 | Long cycle life's energy storage device |
| CN105428698A (en) * | 2015-12-09 | 2016-03-23 | 惠州亿纬锂能股份有限公司 | Rolling needle and application method thereof |
| US20190356022A1 (en) * | 2017-02-01 | 2019-11-21 | Murata Manufacturing Co., Ltd. | Method for manufacturing battery, battery, and winding device |
| CN207474594U (en) * | 2017-08-04 | 2018-06-08 | 深圳市沃特玛电池有限公司 | A kind of lithium ion cylinder battery |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218188A1 (en) * | 2020-04-29 | 2021-11-04 | 广东微电新能源有限公司 | Manufacturing method for cell of energy storage apparatus, and cell |
| WO2022037284A1 (en) * | 2020-08-19 | 2022-02-24 | 广东微电新能源有限公司 | Battery cell of energy storage device and energy storage device |
| WO2022228193A1 (en) * | 2021-04-28 | 2022-11-03 | 广东微电新能源有限公司 | Energy storage device and electronic apparatus |
| CN114447342A (en) * | 2022-04-08 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021218188A1 (en) | 2021-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111446480A (en) | Preparation method of battery cell of energy storage device and battery cell | |
| CN212517286U (en) | Roll core, battery and electronic product | |
| US20110165444A1 (en) | sort of li-ion power cell | |
| CN110600783B (en) | Button cell and manufacturing method | |
| CN214672887U (en) | Battery cell, energy storage device and electronic equipment | |
| CN214672732U (en) | Energy storage device and electronic equipment | |
| CN215644564U (en) | Pole piece assembly, battery and electronic equipment | |
| CN215896616U (en) | Electrode assembly, battery monomer, battery and consumer | |
| CN212303731U (en) | Battery cell of energy storage device and energy storage device | |
| WO2024088367A1 (en) | Electrode assembly, cell, battery module, and preparation method for electrode assembly | |
| CN103022572A (en) | Winding type square power lithium-ion battery | |
| CN218498139U (en) | Roll up core, battery and consumer | |
| CN215771249U (en) | Lithium ion battery and vehicle comprising same | |
| KR101010368B1 (en) | Process for Preparation of Jelly-roll Type Electrode Assembly | |
| CN101499541A (en) | Novel winding type lithium ionic cell and manufacturing method thereof | |
| CN212587557U (en) | Winding type battery cell and lithium ion battery | |
| CN201207413Y (en) | Lamination coiling type lithium ionic cell core | |
| JP3525170B2 (en) | Battery with non-circular spiral electrode body | |
| CN214313441U (en) | Battery cell of energy storage device and energy storage device | |
| CN221304764U (en) | Winding cell and cylindrical battery | |
| CN220914293U (en) | Coiled battery cell of battery cell, battery pack and electricity utilization device | |
| CN220358281U (en) | Novel lithium battery | |
| CN215911550U (en) | Battery and electronic device | |
| CN219759653U (en) | Winding type battery cell, battery and vehicle | |
| CN221126016U (en) | Single battery, winding core winder and electricity utilization device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200724 |
|
| RJ01 | Rejection of invention patent application after publication |