CN114361662B - Square shell cell and battery module - Google Patents
Square shell cell and battery module Download PDFInfo
- Publication number
- CN114361662B CN114361662B CN202110560340.XA CN202110560340A CN114361662B CN 114361662 B CN114361662 B CN 114361662B CN 202110560340 A CN202110560340 A CN 202110560340A CN 114361662 B CN114361662 B CN 114361662B
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- Prior art keywords
- electrode
- electrode plate
- square
- conductive
- foil layer
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000010030 laminating Methods 0.000 claims abstract description 5
- 239000011888 foil Substances 0.000 claims description 28
- 238000009413 insulation Methods 0.000 claims description 15
- 239000007774 positive electrode material Substances 0.000 claims description 8
- 239000007773 negative electrode material Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application discloses a square shell battery cell and a battery module, wherein the square shell battery cell comprises: the square metal shell is provided with a top cover and a lower shell, wherein the top cover is used as a first conductive electrode, and the lower shell is used as a second conductive electrode; the top cover is connected with the lower shell in an insulating way through the insulating assembly; the electrode plate assembly is arranged in the square metal shell, the electrode plate assembly is formed by sequentially laminating and winding a first electrode plate, a first diaphragm, a second electrode plate and a second diaphragm, the polarities of the first electrode plate and the second electrode plate are opposite, one of the first electrode plate and the second electrode plate is in contact with the first conductive electrode, and the other of the first electrode plate and the second electrode plate is in contact with the second conductive electrode. The square shell battery cell omits the wire outlet end of a certain electrode plate, and parts such as a tab and the like are not required to be arranged, so that the structure is simplified, the volumetric specific energy is improved, the cost is reduced, and the volumetric grouping efficiency is improved.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a square shell battery cell. The invention also relates to a battery module comprising the square shell cell.
Background
Along with the increasing severity of energy and environmental problems, the development of new energy automobiles is increased in countries around the world. The power battery is an important component of the electric vehicle, and research on the power battery is imperative.
The square shell lithium battery is one of power batteries, positive and negative electrodes of the existing square shell lithium battery are required to be welded with pole pieces in a shell, the outside of the shell is required to be welded or screwed with a busbar, and after the square shell lithium battery is assembled, the volume specific energy is greatly attenuated, and the reliability is reduced. When in series-parallel connection, a series of parts such as a busbar, a carrier and the like are needed, so that the types of module auxiliary materials are increased, the cost is increased, the process complexity is increased, and the volume grouping efficiency is further reduced.
Disclosure of Invention
Therefore, the invention aims to provide a square-shell battery cell so as to improve the volumetric specific energy, reduce the cost and simplify the structure.
Another object of the present invention is to provide a battery module including the square-case battery cell, so as to simplify the structure, reduce the cost, and increase the volumetric specific energy.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A square cell, comprising:
a square metal housing having a top cover as a first conductive electrode and a lower case as a second conductive electrode;
An insulation assembly through which the top cover and the lower case are connected in an insulating manner;
The electrode plate assembly is arranged in the square metal shell, the electrode plate assembly is formed by sequentially laminating and winding a first electrode plate, a first diaphragm, a second electrode plate and a second diaphragm, the polarities of the first electrode plate and the second electrode plate are opposite, one of the first electrode plate and the second electrode plate is in contact with the first conductive electrode, and the other of the first electrode plate and the second electrode plate is in contact with the second conductive electrode.
Preferably, in the square-shell battery cell, a portion of the first electrode plate beyond the overlapping region of the first diaphragm is a first contact conductive end, a portion of the second electrode plate beyond the overlapping region of the first diaphragm is a second contact conductive end, and one of the first contact conductive end and the second contact conductive end is in contact with the first conductive electrode, and the other is in contact with the second conductive electrode.
Preferably, in the square-shell battery cell, the first electrode plate is one of a positive plate and a negative plate, and the second electrode plate is the other of the positive plate and the negative plate; the positive electrode sheet includes:
a positive electrode foil layer;
And the positive electrode foil layer is coated with the positive electrode active material layer on both sides, and one end of the positive electrode foil layer beyond the overlapping area of the first separator is not coated with the positive electrode active material layer.
Preferably, in the square-case cell described above, the positive electrode foil layer is an aluminum foil layer.
Preferably, in the square-shell battery cell, the first electrode plate is one of a positive plate and a negative plate, and the second electrode plate is the other of the positive plate and the negative plate; the negative electrode sheet includes:
A negative electrode foil layer;
And the negative electrode active material layer is coated on both sides of the negative electrode foil layer, and one end of the negative electrode foil layer exceeding the overlapping area of the first separator is not coated with the negative electrode active material layer.
Preferably, in the square-case cell described above, the negative electrode foil layer is a copper foil layer.
Preferably, in the square-case cell described above, the insulation assembly includes:
The insulation part is of a hollow structure, and the top cover covers one end of the insulation part far away from the lower shell;
The metal part is arranged at the peripheral edge of the insulating part and is in sealing connection with one end of the lower shell, which is close to the top cover.
The invention also provides a battery module, which comprises an electric core, wherein the electric core is the square shell electric core.
Compared with the prior art, the invention has the beneficial effects that:
The square shell battery cell provided by the invention comprises a square metal shell, an insulating assembly and an electrode plate assembly, wherein the square metal shell is provided with a top cover and a lower shell, the top cover is used as a first conductive electrode, and the lower shell is used as a second conductive electrode; the top cover is in insulating connection with the lower shell through an insulating assembly; the electrode plate assembly is arranged in the square metal shell, the electrode plate assembly is formed by sequentially laminating and winding a first electrode plate, a first diaphragm, a second electrode plate and a second diaphragm, the polarities of the first electrode plate and the second electrode plate are opposite, one of the first electrode plate and the second electrode plate is in contact with the first conductive electrode, and the other of the first electrode plate and the second electrode plate is in contact with the second conductive electrode. The top cover of the square metal shell of the square shell battery cell is directly used as a first conductive electrode, the lower shell is directly used as a second conductive electrode, one of the first electrode plate and the second electrode plate which are opposite in polarity and are used as the first conductive electrode is directly contacted and conductive with the top cover of the lower shell which is used as the second conductive electrode, the wire outlet end of one electrode plate is omitted, parts such as a tab and a bus bar are not needed, the structure is simplified, the cost is reduced, the space of the electrode plate is not occupied, the self volume specific energy of a battery is improved, the serial-parallel connection of the battery and the battery is not needed to be connected or welded by bolts, the space is saved, and the volume specific energy of a module or the battery cell is improved; the volume grouping efficiency is improved.
The battery module provided by the application adopts the square shell battery core, so that the wire outlet end of one electrode plate is omitted, parts such as a tab, a busbar and the like are not required to be arranged, the structure is simplified, the volumetric specific energy is improved, the cost is reduced, and the volumetric grouping efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a square-shell battery cell according to an embodiment of the present invention;
Fig. 2 is an exploded view of the square-case cell of fig. 1;
fig. 3 is a schematic structural diagram of an electrode plate assembly of a square-shell battery cell according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a positive plate or a negative plate according to an embodiment of the present invention.
Wherein 1 is a square metal shell, 11 is a top cover, 12 is a lower shell, 2 is an insulating assembly, 21 is an insulating part, 22 is a metal part, 3 is an electrode sheet assembly, 31 is a first electrode sheet, 32 is a first diaphragm, 33 is a second electrode sheet, 34 is a second diaphragm, 311 is a positive electrode foil layer, and 312 is a positive electrode active material layer.
Detailed Description
The core of the invention is to provide a square shell battery cell, which improves the volumetric specific energy, reduces the cost and simplifies the structure.
The invention also provides a battery module comprising the square shell battery cell, which simplifies the structure, reduces the cost and improves the volumetric specific energy.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, an embodiment of the present invention provides a square-shell battery cell, which includes a square metal shell 1, an insulation assembly 2 and an electrode sheet assembly 3, wherein the square metal shell 1 has a top cover 11 and a bottom shell 12, the top cover 11 is used as a first conductive electrode, and the bottom shell 12 is used as a second conductive electrode; the top cover 11 is connected with the lower shell 12 in an insulating way through the insulating assembly 2; the electrode plate assembly 3 is arranged in the square metal shell 1, the electrode plate assembly 3 is formed by sequentially laminating and winding a first electrode plate 31, a first diaphragm 32, a second electrode plate 33 and a second diaphragm 34, the polarities of the first electrode plate 31 and the second electrode plate 33 are opposite, one of the first electrode plate 31 and the second electrode plate 33 is in contact with a first conductive electrode, and the other of the first electrode plate 31 and the second electrode plate 33 is in contact with a second conductive electrode.
The top cover 11 of the square metal shell 1 of the square shell battery core is directly used as a first conducting electrode, the lower shell 12 is directly used as a second conducting electrode, one of the first electrode plate 31 and the second electrode plate 33 which are opposite in polarity of the electrode plate assembly 3 in the lower shell 12 is directly contacted and conducted with the top cover 11 which is used as the first conducting electrode, the other is directly contacted and conducted with the lower shell 12 which is used as the second conducting electrode, the electrode plate assembly 3 is of a winding structure, two ends of the electrode plate assembly 3 of the winding structure are directly contacted and conducted with the top cover 11 and the lower shell 12 through metal conducting parts of the first electrode plate 31 and the second electrode plate 33, the wire outlet end of one electrode plate is omitted, parts such as a lug and a bus bar are not needed, the structure is simplified, the cost is reduced, the space of the electrode plate is not extruded by the lug and the electrode post, the volume specific energy of the battery is improved, the serial-parallel connection of the battery and the battery does not need to be connected by bolts or welded, the space is saved, and the volume energy of the module or the battery core is improved; the volume grouping efficiency is improved.
Further, as shown in fig. 3, in the present embodiment, the portion of the first electrode sheet 31 beyond the overlapping region of the first separator 32 is the first contact conductive end, that is, one end of the rolled first electrode sheet 31 is the first contact conductive end, and the overlapping region refers to the region where the first electrode sheet 31 overlaps the first separator 32 and the second separator 34; the portion of the second electrode sheet 33 beyond the overlapping region of the first separator 32 is a second contact conductive end, that is, one end of the rolled second electrode sheet 33 is a second contact conductive end, and the overlapping region refers to the region where the second electrode sheet 33 overlaps the first separator 32 and the second separator 34; the first contact conduction terminal and the second contact conduction terminal are respectively positioned at two ends of the rolled electrode sheet assembly 3, one of the first contact conduction terminal and the second contact conduction terminal is in contact conduction with the top cover 11 as the first conduction electrode, and the other is in contact conduction with the lower shell 12 as the second conduction electrode. The electrode plate assembly 3 is wound into a rectangular structure, and the shape and the size of the electrode plate assembly are matched with those of the inner space of the lower shell 12. The winding length of the electrode plate can be selected according to the capacity of the battery cell. The coiled electrode plate assembly 3 is adopted, so that the space can be fully utilized, the miniaturization of the electric square shell battery core is realized, and the volumetric specific energy is increased.
In the present embodiment, the first electrode sheet 31 is one of the positive electrode sheet and the negative electrode sheet, and the second electrode sheet 33 is the other of the positive electrode sheet and the negative electrode sheet; as shown in fig. 4, the positive electrode sheet includes a positive electrode foil layer 311 and a positive electrode active material layer 312, wherein both sides of the positive electrode foil layer 311 are coated with the positive electrode active material layer 312, and one end of the positive electrode foil layer 311 beyond the overlapping region is not coated with the positive electrode active material layer 312 for contact conduction with the top cover 11 or the lower case 12. Preferably, the positive electrode foil layer 311 is an aluminum foil layer
Similarly, in the present embodiment, the negative electrode sheet includes a negative electrode foil layer and a negative electrode active material layer, both sides of the negative electrode foil layer are coated with the negative electrode active material layer, and one end of the negative electrode foil layer beyond the overlapping region is not coated with the negative electrode active material layer for contact conduction with the top cap 11 or the lower case 12. Preferably, the negative electrode foil layer is a copper foil layer.
As shown in fig. 1, in the present embodiment, the insulation assembly 2 includes an insulation portion 21 and a metal portion 22; wherein, the insulating part 21 is of a hollow structure, and the top cover 11 covers one end of the insulating part 21 far away from the lower shell 12; the metal part 22 is disposed at the peripheral edge of the insulating part 21, and the metal part 22 is hermetically connected to one end of the lower case 12 near the top cover 11. Insulation between the top cover 11 and the lower shell 12 is achieved through the insulation assembly 2, insulation between the first conductive electrode and the second conductive electrode is further achieved, the lower shell 12 is sealed through the insulation assembly 2, and necessary components such as the inner electrode plate assembly 3 and electrolyte are protected.
Based on the square-shell battery cell described in any embodiment, the embodiment of the invention also provides a battery module which comprises battery cells, wherein the battery cells are the square-shell battery cells described in any embodiment, and the number of the square-shell battery cells can be multiple, so that the battery modules can be connected in series and parallel.
Because the battery module adopts the square shell battery core, the application omits the wire outlet end of one electrode slice, does not need to arrange parts such as a tab, a bus bar and the like, cancels the original welding process of the tab and the electrode slice, simplifies the structure, improves the volumetric specific energy, reduces the cost and improves the volumetric grouping efficiency.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A square cell, comprising:
a square metal housing having a top cover as a first conductive electrode and a lower case as a second conductive electrode;
An insulation assembly through which the top cover and the lower case are connected in an insulating manner;
The electrode plate assembly is arranged in the square metal shell, and is formed by sequentially laminating and winding a first electrode plate, a first diaphragm, a second electrode plate and a second diaphragm, wherein the polarities of the first electrode plate and the second electrode plate are opposite, one of the first electrode plate and the second electrode plate is in contact with the first conductive electrode, and the other of the first electrode plate and the second electrode plate is in contact with the second conductive electrode;
The insulation assembly includes:
The insulation part is of a hollow structure, and the top cover covers one end of the insulation part far away from the lower shell;
The metal part is arranged at the peripheral edge of the insulating part and is in sealing connection with one end of the lower shell, which is close to the top cover.
2. The square-housing cell of claim 1, wherein the portion of the first electrode tab beyond the overlapping region of the first diaphragm is a first contact conductive end and the portion of the second electrode tab beyond the overlapping region of the first diaphragm is a second contact conductive end, one of the first contact conductive end and the second contact conductive end being in contact with the first conductive electrode and the other being in contact with the second conductive electrode.
3. The square-case cell according to claim 2, wherein the first electrode sheet is one of a positive electrode sheet and a negative electrode sheet, and the second electrode sheet is the other of the positive electrode sheet and the negative electrode sheet; the positive electrode sheet includes:
a positive electrode foil layer;
the positive electrode foil layer is coated with the positive electrode active material layer on both sides, and one end of the positive electrode foil layer beyond the overlapping area of the first separator is not coated with the positive electrode active material layer.
4. A square-case cell according to claim 3, wherein the positive electrode foil layer is an aluminum foil layer.
5. The square-case cell according to claim 2, wherein the first electrode sheet is one of a positive electrode sheet and a negative electrode sheet, and the second electrode sheet is the other of the positive electrode sheet and the negative electrode sheet; the negative electrode sheet includes:
A negative electrode foil layer;
And the negative electrode active material layer is coated on both sides of the negative electrode foil layer, and one end of the negative electrode foil layer exceeding the overlapping area of the first separator is not coated with the negative electrode active material layer.
6. The square-case cell of claim 5, wherein the negative electrode foil layer is a copper foil layer.
7. A battery module comprising a cell, wherein the cell is a square-case cell as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110560340.XA CN114361662B (en) | 2021-05-21 | 2021-05-21 | Square shell cell and battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110560340.XA CN114361662B (en) | 2021-05-21 | 2021-05-21 | Square shell cell and battery module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114361662A CN114361662A (en) | 2022-04-15 |
| CN114361662B true CN114361662B (en) | 2024-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110560340.XA Active CN114361662B (en) | 2021-05-21 | 2021-05-21 | Square shell cell and battery module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114361662B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203631692U (en) * | 2013-12-30 | 2014-06-04 | 普天新能源车辆技术有限公司 | Battery |
| CN211654976U (en) * | 2020-03-16 | 2020-10-09 | 惠州惠峰科技有限公司 | Button type lithium battery without electrode lugs |
-
2021
- 2021-05-21 CN CN202110560340.XA patent/CN114361662B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203631692U (en) * | 2013-12-30 | 2014-06-04 | 普天新能源车辆技术有限公司 | Battery |
| CN211654976U (en) * | 2020-03-16 | 2020-10-09 | 惠州惠峰科技有限公司 | Button type lithium battery without electrode lugs |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114361662A (en) | 2022-04-15 |
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Effective date of registration: 20230418 Address after: Room 202, 203, and 204, Building 2, Yard 11, Yanqi Street, Yanqi Economic Development Zone, Huairou District, Beijing, 101400 Applicant after: Beijing Lanpeng Ruichi Technology Co.,Ltd. Address before: 102402 No.1, Qihang West Street, Doudian Town, Fangshan District, Beijing Applicant before: BEIJING WELION NEW ENERGY TECHNOLOGY Co.,Ltd. |
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