CN212303731U - Battery cell of energy storage device and energy storage device - Google Patents
Battery cell of energy storage device and energy storage device Download PDFInfo
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- CN212303731U CN212303731U CN202020694017.2U CN202020694017U CN212303731U CN 212303731 U CN212303731 U CN 212303731U CN 202020694017 U CN202020694017 U CN 202020694017U CN 212303731 U CN212303731 U CN 212303731U
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- storage device
- energy storage
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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
Abstract
The utility model relates to an energy memory's electric core and energy memory, this electric core includes: the positive plate, the negative plate and the two isolating films form a spiral winding structure; at least one of the separators has an extension protruding from ends of the positive electrode tabs and the negative electrode tabs; the extension part is fixed on the side wall of the winding structure by the gummed paper, and the gummed paper is arranged around the side wall. The utility model discloses an in the embodiment, through around the firm degree of barrier film in the fixed adhesive tape enhancement electric core outside on the coiling structure lateral wall, avoid the barrier film to drop and lead to the naked problem of electric core, promoted the security.
Description
Technical Field
The utility model relates to an energy storage technology field, more specifically, the utility model relates to an energy memory's electric core and energy memory.
Background
The battery cell in the energy storage device is conducted with the shell through the electric connection part, and insulation is formed between the rest part of the battery cell and the shell. The insulation performance of the battery core has great influence on the safety and reliability of the energy storage device. In the existing cell structure, a layer of isolating film is wound on the outer side of a cell. The isolation film is used for forming insulation on the outer side of the battery core.
The outermost barrier film of electric core among the prior art drops easily, can cause electric core to expose, and naked electric core can switch on with the casing contact, has reduced electric core and the energy memory's at electric core place security.
Therefore, a new technical solution is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a new technical scheme of energy memory's electric core.
According to the utility model discloses an aspect provides an electric core of energy memory, include:
the positive plate, the negative plate and the two isolating films form a spiral winding structure;
at least one of the separators has an extension protruding from ends of the positive electrode tabs and the negative electrode tabs;
the extension part is fixed on the side wall of the winding structure by the gummed paper, and the gummed paper is arranged around the side wall.
Optionally, the gummed paper covers the side walls of the winding structure.
Optionally, a plurality of layers of the gummed paper are included.
Optionally, the extension is at least one revolution around the circumference of the sidewall.
Optionally, the insulating gummed paper is made of plastic.
Optionally, two of the isolation films are formed by bending one isolation film.
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 in the axial direction of the winding structure.
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, 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 the utility model discloses a first aspect provides an energy storage device, include:
a cell of an energy storage device as claimed in any of the above;
the battery cell is arranged in the shell.
The utility model discloses a technological effect lies in, through around the firm degree of barrier film in the fixed adhesive tape enhancement electric core outside on the coiling structure lateral wall, avoids the barrier film to drop and leads to the naked problem of electric core, has promoted the security.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, 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 cell end face according to an embodiment of the present disclosure.
3 fig. 32 3 is 3 a 3 partial 3 schematic 3 view 3 of 3 a 3 cross 3- 3 sectional 3 view 3 a 3- 3 a 3 of 3 fig. 31 3. 3
Fig. 3 is a side view of a cell of one embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a structure in which a portion of the adhesive tape protruding from the end of the winding structure is poured on the end to cover the positive electrode sheet and the negative electrode sheet according to an embodiment of the disclosure.
In the figure, 1 is a positive electrode sheet, 2 is a negative electrode sheet, 3 is a separator, 31 is an extension portion, 32 is a projection portion, and 4 is adhesive tape.
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: unless specifically stated otherwise, 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.
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 and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a 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 an embodiment of the present disclosure, a battery cell of an energy storage device is provided, as shown in fig. 1 and 3, the battery cell includes: the lithium battery comprises a positive plate 1, a negative plate 2 and two isolating films 3, wherein one of the positive plate 1 and the negative plate 2 is positioned between the two isolating films 3, the other one of the positive plate 1 and the negative plate 2 is positioned on the outer side of one of the isolating films 3, and the positive plate 1, the negative plate 2 and the two isolating films 3 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; and the gummed paper 4 fixes the extension part 31 on the side wall of the winding structure, and the gummed paper 4 is arranged around the side wall.
In this embodiment, the positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 are wound to form a cell in a wound structure. The positive plate 1 and the negative plate 2 are insulated by a separation film 3. The side wall of the battery cell is provided with the isolating membrane 3 and the extension part 31, so that the purpose of insulating the battery cell from the shell is achieved. The extension 31 forms insulation around the sidewall.
The end of the extension 31 is fixed to the sidewall, and it may be the case in the prior art that the fixed structure of the end is separated from the sidewall. Under the condition that the tip of extension 31 drops from the lateral wall, can lead to electric core to expose, can cause electric core and casing to switch on the problem that influences energy memory normal work, reduced energy memory's security. In this embodiment, the adhesive tape 4 is fixed around the side wall of the winding structure, so that the isolation film 3 and the extension portion 31 on the side wall are further fixed on the side wall, the isolation film 3 and the extension portion 31 are more firmly fixed, the insulation reliability of the battery cell is ensured, and the safety of the energy storage device is improved.
The adhesive paper 4 is an insulating adhesive paper. The adhesive tape 4 is fixed on the side wall and the end part of the winding structure, plays a role in reinforcing the insulating layer formed by the isolating film 3, and can avoid falling off. On this basis, at least one insulating layer can be formed on the outer layer of the separator 3 by using an insulating adhesive paper as the adhesive paper 4. The insulating layer formed by the adhesive paper 4 can improve the firmness of the isolating film 3, cannot easily fall off, can increase the insulating layer and improve the insulating capability of the winding structure. Therefore, the insulating adhesive tape is adopted as the adhesive tape 4, so that the unsafe problem caused by incorrect conduction of the battery cell and the shell can be further avoided, the safety of the battery cell is improved, and the safety of the energy storage device where the battery cell is located is also improved.
In one example, the process for preparing the cell of the energy storage device may be:
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 is started from the same end of the positive electrode sheet 1, the negative electrode sheet 2 and the two separation films 3 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 is fixed to the side wall of the winding structure 3 by the adhesive paper 4.
The adhesive paper 4 may be fixed at the end of the extension 31, or the adhesive paper may be fixed to the extension 31 around the sidewall for at least one circle.
The preparation process is simple and easy to operate, the extension part 31 of the isolating membrane 3 on the prepared battery core is not easy to fall off, and the safety is high.
In one example, the adhesive paper 4 may be a single-sided adhesive paper. The adhesive surface of the adhesive tape 4 is adhered to the side wall to form adhesion, so that the isolation film 3 is further fixed, and the isolation film 3 cannot fall off. The battery cell can not expose a part, and the safety of the battery cell is improved.
The adhesive paper 4 can also be adhesive paper with an end part capable of being bonded, the adhesive paper 4 can be wound on the side wall of the winding structure, and the wound end part can be bonded to form the adhesive paper to be fixed. The winding can be carried out for a plurality of turns or can be carried out for one turn.
The gummed paper 4 can be fixed by wrapping the lateral wall with a single circle, or two gummed papers 4 can be fixed at different axial positions of the lateral wall, for example, two gummed papers 4 are respectively fixed at the positions of the lateral wall close to the end parts.
In one embodiment, the gummed paper 4 covers the side walls of the winding structure.
The separation occurs at different positions around the separator 3 fixed to the side wall, and particularly the end of the extension 31 from which the separator 3 extends is most likely to be separated from the side wall. The gummed paper 4 is made to cover the side wall, thereby forming a surrounding fixation to all positions on the side wall. The gummed paper 4 can completely cover the side wall, and the end part of the extension part 31 is prevented from falling off. And the separation film 3 can be prevented from falling off from the position at the end of the winding structure. In the embodiment, the problem of battery cell exposure caused by the falling of the isolating film 3 is effectively avoided by covering the side wall, and the safety of the battery cell is further improved.
In one embodiment, a plurality of layers of said gummed paper 4 are included.
In this embodiment, a plurality of layers of adhesive tapes 4 wound around the side wall of the winding structure are provided, and the adhesive tapes 4 fixed on the side wall can increase the firmness of the isolation film 3, thereby avoiding the problem of bare cell caused by the falling off of the isolation film 3.
In one example, as shown in fig. 4, the adhesive paper 4 protrudes from both ends of the winding structure in the axial direction. The protruding portion is poured over the end portion, further reinforcing the separator 3 at the end portion. The protruding portion of the gummed paper 4 may cover both ends completely after pouring, or may cover only a partial position of both ends.
In one embodiment, the extension 31 makes at least one revolution around the circumference of the sidewall.
In this embodiment, the extending portion 31 has an insulating function at the end in the extending direction of the positive electrode sheet 1 and the negative electrode sheet 2 in the axial direction of the winding structure. The insulating effect of the extension 31 on the end portions of the positive and negative electrode sheets 1 and 2 is improved by the extension 31 surrounding at least one circumference. The adhesive paper 4 fixing extension 31 forms a further fixing function on the side wall.
In one embodiment, the insulating gummed paper is made of plastic.
The plastic material has good insulating property and can meet the insulating property of the insulating gummed paper. And the plastic-made insulating gummed paper has excellent flexibility and strength, and can be attached and fixed on the side wall of the winding structure to form fixation outside the isolation film 3.
In one embodiment, two of the isolation films 3 are 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 being larger than the dimension of the positive electrode sheet 1 by at least 3mm can ensure that the positive electrode sheet 1 can sufficiently exert charge and discharge capacity. 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. 2, the portions of the separator 3 larger than the size of the negative electrode tab 2 form projections 32 at both ends 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 ends.
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, 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.
In this embodiment, the isolation film 3 protrudes from the starting ends of the positive electrode plate 1 and the negative electrode plate 2, and in the winding structure, the protruding portion is limited in the battery cell, so that the fixing firmness of the isolation film 3 can be improved, the isolation film 3 is prevented from loosening, and the safety of the battery cell is improved.
The protruding part of the isolating film 3 protrudes from the end part of the winding structure, and the adhesive tape 4 fixes the part protruding from the end part, so that the firmness of the isolating film 3 fixed on the battery cell is further improved.
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 provided between the electrical connection portion on the cell and the winding structure end of the cell, and the insulating layer plays a role of insulating the electrical connection portion from the partial structures of the positive electrode sheet 1 and the negative electrode sheet 2 at the winding structure end. The insulating layer has small volume, small area fixed between the end part and the electric connection part and easy falling off. The adhesive tape 4 can protrude out of the side wall of the winding structure, the part protruding out of the side wall further fixes the insulating layer, the firmness of the insulating layer is improved, and therefore the problem that the electric connection part is conducted with the positive plate 1 and the negative plate 2 to cause short circuit of the electric core due to falling off of the insulating layer is avoided, and the safety of the electric core is improved.
In one embodiment, the positive electrode tab 1 includes a positive electrode material and a positive electrode active material attached to the positive electrode material, and the negative electrode tab 2 includes a negative electrode material and a negative electrode active material attached to the negative electrode material. For example, the positive electrode material is aluminum, and the positive electrode active material is a lithium-containing active material. The negative electrode material is copper, and the negative electrode active material is graphite. The separator 3 is an insulating material that allows lithium ions to pass therethrough.
In one embodiment of the present disclosure, there is provided an energy storage device including: a cell of the energy storage device according to any of the embodiments above; the battery cell is arranged in the shell. The energy storage device in this embodiment is high in safety, and barrier film 3 on the electric core can not drop, and the problem of short circuit can not appear between electric core and casing. The energy storage device is high in safety.
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 illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the 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. An electrical core of an energy storage device, comprising:
the positive plate, the negative plate and the two isolating films form a spiral winding structure;
at least one of the separators has an extension protruding from ends of the positive electrode tabs and the negative electrode tabs;
the extension part is fixed on the side wall of the winding structure by the gummed paper, and the gummed paper is arranged around the side wall.
2. The electrical core of the energy storage device of claim 1, wherein the adhesive paper covers the sidewalls of the winding structure.
3. The electrical core of the energy storage device of claim 1, comprising a plurality of layers of the adhesive paper.
4. The electrical core of an energy storage device of claim 1, wherein the extension portion surrounds the sidewall at least one circumference in a circumferential direction.
5. The electrical core of the energy storage device of claim 1, wherein the adhesive paper is made of plastic.
6. The battery cell of the energy storage device of claim 1, wherein the two isolation films are formed by bending one isolation film.
7. The battery cell of the energy storage device of claim 1, wherein the negative electrode sheet has a dimension at least 0.1mm greater than a dimension of the positive electrode sheet in an axial direction of the winding structure.
8. The battery cell of the energy storage device of claim 1, wherein the size of each of the two separation films is at least 0.5mm larger than the size of the negative electrode sheet along the axial direction of the winding structure.
9. The battery cell of the energy storage device of claim 8, wherein, in the axial direction of the winding structure, the portion of the separator film that is larger than the dimension of the negative electrode sheet forms a protrusion at both ends of the winding structure, and the protrusion is inclined to cover the positive electrode sheet and the negative electrode sheet at both ends.
10. The battery cell of the energy storage device of claim 1, wherein the negative electrode sheet has a size at least 3mm larger than the positive electrode sheet in a circumferential direction of the winding structure.
11. The battery cell of the energy storage device of claim 1, wherein at least one of the two separators protrudes from the positive electrode sheet and the negative electrode sheet at the beginning of the winding structure.
12. An energy storage device, comprising:
a cell of an energy storage device according to any of claims 1-11;
the battery cell is arranged in the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020694017.2U CN212303731U (en) | 2020-04-29 | 2020-04-29 | Battery cell of energy storage device and energy storage device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020694017.2U CN212303731U (en) | 2020-04-29 | 2020-04-29 | Battery cell of energy storage device and energy storage device |
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| CN212303731U true CN212303731U (en) | 2021-01-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2020
- 2020-04-29 CN CN202020694017.2U patent/CN212303731U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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